Most commonly used kit and equipment of microbiology on Viva

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Microbiology Lab: Commonly Used Kit & Equipment - Viva Guide

1. AUTOCLAVE (Steam Sterilizer)

Principle: Uses moist heat under pressure. Steam at 121°C, 15 psi (103 kPa) for 15-20 minutes denatures proteins and destroys all microorganisms including spores.

Uses:

Sterilization of culture media, glassware, surgical instruments, and contaminated waste
Most widely used sterilization method in microbiology labs

Key Viva Points:

Moist heat is more efficient than dry heat because moisture aids protein denaturation
Spore-forming bacteria (e.g., Clostridium, Bacillus) are killed at 121°C/15 min
Cannot be used for heat-labile materials

2. HOT AIR OVEN (Dry Heat Sterilizer)

Principle: Dry heat at 160°C for 2 hours - causes oxidation and coagulation of proteins.

Uses:

Sterilizing glassware (test tubes, petri dishes, pipettes), metal instruments, powders, oils, waxes
Materials that cannot be steam-sterilized (immiscible in water)

Key Viva Points:

Spores require 160°C x 2 hours or 170°C x 1 hour
Cannot be used for rubber, plastics, or culture media (degrade)

3. MICROSCOPE

Types & Principles:

Type	Principle	Use in Microbiology
Light (Brightfield)	Transmitted visible light	Routine staining (Gram, ZN)
Darkfield	Oblique light, no direct illumination	Treponema pallidum, spirochetes
Phase Contrast	Refractive index difference	Unstained living cells
Fluorescence	UV excitation of fluorochromes	AFB (auramine), immunofluorescence
Electron (TEM/SEM)	Electron beam	Viral morphology, ultrastructure

Key Viva Points:

Oil immersion (100x objective) used for bacteria - requires cedar oil or synthetic immersion oil
Resolving power of light microscope: ~0.2 μm
Darkfield is the classical method to visualize Treponema pallidum (too thin to stain normally)

4. BUNSEN BURNER

Principle: Gas-fueled single open flame. Creates an updraft of hot air forming a sterile zone around it (~15 cm radius).

Uses:

Flaming inoculation loops (incineration - simplest sterilization method)
Maintaining aseptic conditions near the working area
Heating media, fixing smears on glass slides
Emergency sterilization of knife blades or needles

Key Viva Points:

The loop is held at the junction of the blue and luminous part of the flame (hottest zone)
The flame should be blue (complete combustion) - yellow indicates incomplete combustion
Modern labs may replace it with gas-free electric incinerators inside biosafety cabinets

5. INOCULATION LOOP & NEEDLE

Types:

Wire loop (nichrome or platinum) - for streaking plates, subculturing
Disposable plastic loops - single-use, pre-calibrated (1 µL or 10 µL)
Straight needle - for stab cultures, picking colonies

Sterilization: Flaming in Bunsen burner (incineration - the simplest and most rapid method)

Key Viva Point: Always cool the loop before touching a colony - a hot loop kills organisms and splatters aerosols.

6. CENTRIFUGE

Principle: Centrifugal force separates substances by density. Based on sedimentation - high rotation speed causes heavier particles to sediment at the bottom.

Types:

Low speed (standard): urine, sputum, CSF processing
High speed: bacterial cell separation
Ultracentrifuge: virus isolation, subcellular fractionation

Uses:

Concentrating organisms from CSF, urine, sputum for culture/microscopy
Separating blood components
DNA, protein purification

7. INCUBATOR

Principle: Maintains optimal temperature, humidity, and sometimes CO₂ for microbial growth.

Standard settings:

Bacterial incubator: 37°C (body temperature)
Fungal incubator: 25-28°C
CO₂ incubator: 37°C + 5% CO₂ (for fastidious organisms like Neisseria, cell cultures)

Uses:

Culturing bacteria, fungi, cell lines
Pharmaceutical, hematological, and biochemical studies

8. LAMINAR AIRFLOW / BIOSAFETY CABINET (BSC)

Principle: HEPA-filtered, unidirectional (laminar) airflow creates a particle-free, sterile working environment.

Types:

Class	Protection	Used For
Class I	Personnel + environment	Low-risk organisms
Class II A/B	Personnel + product + environment	Most clinical work
Class III	Maximum containment	BSL-3/4 organisms

Uses:

Preparation of sterile media and reagents
Handling of clinical specimens
Working with hazardous or infectious microorganisms

9. CULTURE MEDIA

Types by physical state:

Solid (agar-based): Blood agar, MacConkey, CLED
Liquid (broth): Thioglycollate, BHI, peptone water
Semi-solid: Motility testing

Types by purpose:

Type	Example	Use
Nutrient / General	Nutrient agar	Most organisms
Selective	MacConkey, TCBS	Select specific bacteria
Differential	Blood agar, CLED	Differentiate by colony morphology
Enriched	Chocolate agar	Fastidious organisms (H. influenzae)
Enrichment broth	Selenite F	Isolate pathogens from mixed flora
Transport media	Stuart's, VTM	Preserve viability during transit

Key Viva Point: Agar is derived from red algae - it solidifies at 42°C and melts at 96°C. Very few bacteria degrade agar.

10. GLASS SLIDES & COVERSLIPS

Uses:

Preparing smears for Gram stain, ZN stain, wet mount
Fixing smears (heat-fixed or methanol-fixed)

Key Viva Point: Slides for immunofluorescence must be completely clean and free of grease.

11. STAINING REAGENTS (Viva Favorites)

Gram Stain (Christian Gram, 1884)

Step	Reagent	Result
Primary stain	Crystal violet (1 min)	All cells purple
Mordant	Gram's iodine (1 min)	Crystal violet-iodine complex
Decolorizer	Acetone-alcohol (5-10 sec)	Gram-neg lose color, Gram-pos retain
Counterstain	Safranin (1 min)	Gram-neg red/pink

Gram-positive: Thick peptidoglycan wall retains crystal violet - purple/blue
Gram-negative: Thin peptidoglycan + outer membrane - loses CV, takes safranin - pink/red

Ziehl-Neelsen (ZN) Stain - Acid-Fast Stain

Hot carbol fuchsin → decolorize with 20% H₂SO₄ or 3% HCl-alcohol → counterstain methylene blue
AFB (e.g., M. tuberculosis): Red/pink (acid-fast)
Background/non-AFB: Blue
Principle: Mycobacteria have mycolic acid in their cell wall - once stained with carbol fuchsin, they resist decolorization with acid-alcohol

Other Stains:

Albert's stain - metachromatic granules in Corynebacterium diphtheriae
India ink / Nigrosin - negative staining, capsule of Cryptococcus neoformans
Giemsa - malaria parasites, Borrelia, Leishmania
PAS (Periodic Acid-Schiff) - fungal cell walls
Calcofluo white - fungal elements (fluorescent)

12. MEMBRANE FILTER

Principle: Physical removal of bacteria by pore size (0.2 µm filters remove bacteria; 0.45 µm used for larger particles).

Uses:

Sterilization of heat-labile fluids (serum, antibiotics, vitamins, media supplements)
Filtration is NOT effective for removing viruses

Key Viva Point: The Seitz filter (asbestos pad) and Berkefeld filter (diatomite) are older types; Millipore membrane filters (cellulose acetate) are now standard.

13. WATER BATH

Principle: Constant temperature water chamber - temperatures range 5-99°C.

Uses:

Incubating samples at precisely controlled temperatures
Melting agar before pouring plates (kept at 50-56°C to stay molten but not kill organisms)
Enzyme reactions, serological tests (complement fixation)
Safe heat source for flammable chemicals (no open flame)

14. DEEP FREEZER / REFRIGERATOR

Equipment	Temperature	Use
Refrigerator	4°C	Short-term storage of media, reagents, specimens
-20°C freezer	-20°C	Serum, enzymes, reagents
Deep freezer	-70°C to -80°C	Long-term stock cultures, viruses
Liquid nitrogen	-196°C	Permanent culture preservation

Principle: Extremely low temperatures suppress microbial growth and metabolic activity, preserving cultures and biological materials.

15. SPECTROPHOTOMETER (Colorimeter)

Principle: Measures the amount of light absorbed by a solution at a specific wavelength (Beer-Lambert Law: Absorbance = εcl).

Uses:

Measuring bacterial growth (turbidity/OD at 600 nm)
Quantifying proteins, nucleic acids, enzyme activity
McFarland standards to standardize bacterial suspensions for antibiotic sensitivity testing

16. pH METER

Uses:

Adjusting pH of culture media (most bacteriological media: pH 7.2-7.4)
Checking buffers and reagents

17. ANAEROBIC JAR (McIntosh-Fildes Jar)

Principle: Creates an anaerobic environment using a gas pack (generates H₂ + CO₂; catalyst removes O₂ by combining with H₂ to form water).

Uses:

Culture of obligate anaerobes (Clostridium, Bacteroides, Fusobacterium)
Methylene blue indicator turns colorless under anaerobic conditions

18. VORTEX MIXER

Principle: Motorized motor causes rapid agitation/vibration of the tube contents via a motorized shaft, creating a "vortex" of fluid.

Uses:

Mixing specimens (e.g., viral specimens in VTM before processing)
Homogenizing suspensions
Mixing reagents before tests

Quick Viva Summary Table

Equipment	Key Temperature / Parameter	Principle
Autoclave	121°C, 15 psi, 15-20 min	Moist heat, protein denaturation
Hot air oven	160°C, 2 hrs	Dry heat, oxidation
Incubator (bacteria)	37°C	Temperature control for growth
Incubator (fungi)	25-28°C	Temperature control
Deep freezer	-70 to -80°C	Preservation by low temperature
Water bath	37-56°C (variable)	Controlled water temperature
Membrane filter	0.2 µm pore	Physical sieving of bacteria
Laminar hood (BSC II)	HEPA filtered	Unidirectional sterile airflow

Common Viva Questions

Q: Why is moist heat more effective than dry heat? A: Moisture aids protein denaturation - wet proteins coagulate at much lower temperatures than dry proteins.

Q: What is the indicator for autoclaving? A: Browne's tubes (chemical) or Bowie-Dick tape (indicator tape); biological indicator = Bacillus stearothermophilus spores.

Q: What media is used for Mycobacterium tuberculosis? A: Lowenstein-Jensen (LJ) medium (solid, egg-based); BACTEC liquid media for rapid detection.

Q: What pore size removes bacteria from fluids? A: 0.2 µm membrane filter.

Q: How do you sterilize serum or antibiotics for media? A: Membrane filtration (heat-labile - cannot autoclave).

Q: What is the principle of the Gram stain? A: Thick peptidoglycan in Gram-positive bacteria forms a crystal violet-iodine complex that resists decolorization by acetone-alcohol; Gram-negative bacteria have a thin peptidoglycan layer and outer membrane - the outer membrane is disrupted by acetone-alcohol, CV-iodine complex washes out, and safranin counterstains them pink.

Sources: Sherris & Ryan's Medical Microbiology (8th Ed.), Henry's Clinical Diagnosis and Management by Laboratory Methods, MicrobeNotes - 18 Instruments in Microbiology Lab

Microbiology commonly used equipment and slide and life cycle of organism test kit with pictures and slide with diagram and proper labelling

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Detailed scientific diagram of a compound light microscope with clear proper labels pointing to each part: Eyepiece (ocular lens), Body tube, Revolving nosepiece, Objective lenses (4x 10x 40x 100x oil immersion), Stage with stage clips, Diaphragm/iris diaphragm, Condenser, Light source/illuminator, Coarse adjustment knob, Fine adjustment knob, Arm, Base. Clean white background, educational style, blue and black color scheme.

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Scientific diagram of an autoclave (pressure steam sterilizer) cross-section with labels: Chamber/vessel, Door with locking mechanism, Pressure gauge, Temperature gauge, Safety valve, Steam inlet, Steam outlet/exhaust, Drain valve, Heating element, Thermometer port, Gasket/seal. Shows steam arrows inside chamber. Educational medical microbiology style, clean white background, blue and grey color scheme.

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Scientific diagram showing Gram stain procedure on a glass microscope slide with step-by-step labels: Step 1 - Apply Crystal Violet (primary stain, 1 min) - all bacteria purple; Step 2 - Apply Gram's Iodine (mordant, 1 min) - mordant fixes dye; Step 3 - Decolorize with Acetone-Alcohol (5-10 sec) - Gram-positive stays purple, Gram-negative loses color; Step 4 - Apply Safranin (counterstain, 1 min) - Gram-negative turns pink/red. Show bacterial cells in each step changing color. Bottom shows final result: Gram-positive cocci in purple clusters (Staphylococcus) and Gram-negative rods in pink (E.coli). Educational microbiology style, clear labels, white background.

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Detailed life cycle diagram of Ascaris lumbricoides (giant roundworm) showing complete cycle with labels: 1) Embryonated egg in soil (infective stage); 2) Ingestion by human; 3) Egg hatches in small intestine releasing larva; 4) Larva penetrates intestinal wall; 5) Larva migrates via blood to liver; 6) Larva travels to lungs via pulmonary circulation; 7) Larva in lung alveoli (Loeffler's syndrome); 8) Larva coughed up, swallowed; 9) Adult worm in small intestine; 10) Female worm lays 200,000 eggs/day; 11) Fertilized and unfertilized eggs passed in feces to soil. Show human body silhouette with migration path arrows. Educational medical style, clear numbered labels.

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Microbiology lab test kit diagram showing commonly used consumables and equipment laid out on a lab bench with labels: 1) Petri dishes (90mm) - bacterial culture; 2) Test tubes with caps; 3) Inoculation loop (wire loop); 4) Straight inoculation needle; 5) Glass slides and coverslips; 6) Disposable syringes and needles; 7) Swab transport system (Stuart's medium); 8) Blood culture bottles (aerobic and anaerobic); 9) McFarland 0.5 turbidity standard; 10) API strips for bacterial identification; 11) Antibiotic sensitivity discs (Kirby-Bauer); 12) Agar plates - Blood agar, MacConkey, CLED; 13) Staining reagents rack (Crystal violet, Iodine, Safranin); 14) Sterile pipettes and tips. Clean white background, professional scientific illustration style with clear numbered labels.

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Scientific diagram showing Ziehl-Neelsen (ZN) acid-fast staining procedure with labelled steps: Step 1 - Hot Carbol Fuchsin applied with heating (5 min) - all bacteria red; Step 2 - Decolorize with 20% H2SO4 or 3% HCl-alcohol (3-5 min) - non-AFB lose color; Step 3 - Counterstain with Methylene Blue (1 min) - non-AFB turn blue. Final microscopy result shows: Acid-Fast Bacilli (Mycobacterium tuberculosis) - bright red rods; Background cells - blue. Include labels showing mycolic acid in cell wall mechanism. Educational microbiology viva style, clean background.

Here is your complete, fully illustrated viva guide covering all three sections:

MICROBIOLOGY VIVA - COMPLETE ILLUSTRATED GUIDE

SECTION 1: COMMON EQUIPMENT & TEST KITS

1. COMPOUND LIGHT MICROSCOPE

Part	Function
Eyepiece (10x)	Magnifies the image from the objective
Body tube	Connects eyepiece to nosepiece
Revolving nosepiece	Holds and rotates objective lenses
Objective lenses	4x (scanning), 10x (low), 40x (high), 100x (oil immersion) for bacteria
Stage + clips	Holds the glass slide
Iris diaphragm	Regulates amount of light
Condenser	Focuses light onto the specimen
Coarse knob	Initial focusing (large movements)
Fine knob	Precise sharp focusing
Base/Illuminator	Supports microscope, contains light source

Key Viva Points:

Total magnification = Eyepiece x Objective (e.g. 10x x 100x = 1000x)
Resolving power of light microscope = 0.2 µm
Oil immersion (100x) uses cedar or synthetic oil to increase refractive index and resolution
Bacteria are viewed at 1000x total magnification (oil immersion)

2. AUTOCLAVE (Steam Sterilizer)

Principle: Moist heat under pressure at 121°C, 15 psi, for 15-20 minutes

Key Parts:

Chamber - holds items for sterilization
Pressure gauge - monitors pressure (15 psi/103 kPa)
Temperature gauge - confirms 121°C
Safety/relief valve - prevents over-pressurization
Steam inlet - allows steam entry
Drain valve - removes condensate

Uses: Sterilizes culture media, glassware, instruments, contaminated waste

Cannot autoclave: Heat-labile materials (serum, antibiotics, vitamins, some plastics) - use membrane filtration (0.2 µm) instead

Biological indicator: Bacillus stearothermophilus spore strips

3. COMMON TEST KIT & CONSUMABLES

Microbiology Lab Test Kit and Consumables

Item	Purpose	Key Detail
Petri dishes (90mm)	Solid culture media plates	Disposable; inverted during incubation
Inoculation loop (1µL/10µL)	Streaking plates, subculture	Sterilize by flaming (incineration)
Straight needle	Stab cultures, picking colonies
Glass slides + coverslips	Smear preparation, wet mount	Clean, grease-free
Swab + Stuart's transport	Specimen collection/transport	Maintains viability without growth
Blood culture bottles	Aerobic + anaerobic blood culture	Signal growth by CO₂ detection
McFarland 0.5 standard	Calibrates bacterial suspension for AST	Equivalent to ~1.5 × 10⁸ CFU/mL
Kirby-Bauer discs	Antibiotic sensitivity testing	Zone of inhibition measured in mm
API strips	Rapid biochemical identification	20 biochemical tests in one strip
Blood agar, MacConkey, CLED	Differential/selective culture	Differentiate and isolate pathogens

SECTION 2: STAINING SLIDES WITH DIAGRAMS

4. GRAM STAIN PROCEDURE & SLIDE

Steps:

Step	Reagent	Time	Result
1. Primary stain	Crystal violet	1 min	All bacteria purple
2. Mordant	Gram's iodine	1 min	Crystal violet-iodine complex forms
3. Decolorize	Acetone-alcohol	5-10 sec	Gram+ retains purple; Gram- loses color
4. Counterstain	Safranin	1 min	Gram- turns pink/red

Results on Slide:

Gram-positive (purple/blue): Staphylococcus (cocci in clusters), Streptococcus (cocci in chains), Clostridium (rods)
Gram-negative (pink/red): E. coli, Klebsiella, Pseudomonas, Neisseria (diplococci)

Why the difference?

Gram-positive: Thick peptidoglycan layer (20-80 nm) retains CV-iodine complex despite decolorization
Gram-negative: Thin peptidoglycan (2-7 nm) + outer membrane (lipid) - acetone-alcohol dissolves lipid, CV-iodine washes out

Critical Viva: Over-decolorization makes Gram-positive appear Gram-negative. Under-decolorization makes Gram-negative appear Gram-positive.

5. ZIEHL-NEELSEN (ZN) ACID-FAST STAIN

Steps:

Step	Reagent	Condition	Time
1. Primary stain	Carbol fuchsin	Heat (steaming)	5 min
2. Decolorize	20% H₂SO₄ or 3% HCl-alcohol	Room temp	3-5 min
3. Counterstain	Methylene blue (or malachite green)	Room temp	1 min

Results on Slide:

AFB (Acid-Fast Bacilli) = Bright red slender rods (e.g., M. tuberculosis, M. leprae)
Non-AFB, background = Blue

Principle:

Mycobacteria have mycolic acid in their thick waxy cell wall. Once carbol fuchsin penetrates (with heat), it forms a stable complex with mycolic acid that resists decolorization even with strong acid - hence "acid-fast."

Modified ZN (Cold method):

For Cryptosporidium, Isospora, Cyclospora (use 1% H₂SO₄ - weaker acid)

Other Important Stains for Viva:

Stain	Organism	Color of Organism
India Ink / Nigrosin	Cryptococcus neoformans capsule	Clear halo on dark background
Albert's stain	Corynebacterium diphtheriae (metachromatic granules)	Blue-green rods with dark granules
Giemsa stain	Malaria, Leishmania, Borrelia	Violet/purple parasites
PAS stain	Fungal cell walls	Magenta/pink
Calcofluo white	Fungi (fluorescence)	Bright blue-white under UV
Lactophenol cotton blue	Fungi (slide culture)	Blue hyphal structures

SECTION 3: LIFE CYCLES OF ORGANISMS

6. PLASMODIUM (MALARIA) - LIFE CYCLE

(From Medical Microbiology 9e - Fig. 73.1)

Life Cycle of Plasmodium Species - Medical Microbiology 9e

Two Hosts:

Definitive host (sexual reproduction): Female Anopheles mosquito
Intermediate host (asexual reproduction): Human

Life Cycle Steps:

IN MOSQUITO (Sexual cycle):

Mosquito ingests gametocytes from infected human blood
Microgamete (male) + macrogamete (female) → Ookinete → Oocyst (in stomach wall)
Oocyst ruptures → releases sporozoites → migrate to salivary gland
Takes ~2 weeks (extrinsic incubation period)

IN HUMAN (Asexual cycle):

Phase	Location	Stage	Duration
Exo-erythrocytic (Pre-erythrocytic)	Liver parenchymal cells	Sporozoites → Schizonts → Merozoites	8-25 days
Erythrocytic cycle	Red blood cells	Merozoites → Ring → Trophozoite → Schizont → Merozoites (x16-24)	48-72 hrs
Gametocyte formation	RBCs	Some merozoites → Male/Female gametocytes	-

Special Feature: Hypnozoites

P. vivax and P. ovale form dormant hypnozoites in liver
Cause relapses months to years later
Treated with primaquine (only drug active against hypnozoites)

Species Differences:

Feature	P. falciparum	P. vivax	P. malariae	P. ovale
Fever cycle	48 hrs (tertian)	48 hrs (tertian)	72 hrs (quartan)	48 hrs
Relapse	No	Yes	Recrudescence	Yes
Severe malaria	Yes	Rare	No	No
RBC infected	Any age	Young (reticulocytes)	Older RBCs	Reticulocytes

Diagnosis on Blood Smear (Giemsa-stained):

Thick film - detects parasites (more sensitive)
Thin film - identifies species
P. falciparum ring forms: multiple rings per RBC, "appliqué/accolé" forms, banana-shaped gametocytes

7. ENTAMOEBA HISTOLYTICA - LIFE CYCLE

(From Tietz Textbook / Medical Microbiology 9e - CDC/DPDx diagram)

Life Cycle of Entamoeba histolytica - CDC/DPDx

Life Cycle of Entamoeba histolytica - Medical Microbiology 9e

Two Stages (Simple Life Cycle - Only ONE host: Human):

STAGE 1: CYST (Infective stage)

Quadrinucleate cyst (4 nuclei) - the infective form
Passed in formed feces
Survives weeks to months in damp environment
Killed by boiling but NOT by chlorination

STAGE 2: TROPHOZOITE (Pathogenic stage)

Actively motile (directional motility via pseudopodia)
Found in loose stools and tissue
Trophozoite disintegrates in external environment

Life Cycle Steps:

Mature cyst (4 nuclei) ingested via contaminated food/water
Passes stomach intact
Excystation in small intestine → releases trophozoites
Trophozoite migrates to large intestine (colon)
Either:
- A) Remains in lumen - noninvasive colonization (asymptomatic)
- B) Invades colonic wall - intestinal amebiasis (flask-shaped ulcers, dysentery)
- C) Enters bloodstream - extraintestinal amebiasis (liver abscess, lung, brain)
Trophozoites encyst → mature cysts passed in feces → cycle repeats

Diagnostic Stage:

Cysts in stool (formed stool) - 4 nuclei, chromatoid bars (cigar-shaped)
Trophozoites in stool (loose/bloody stool) - contain ingested RBCs (hallmark of invasive disease)

Cyst vs. Trophozoite Morphology:

Feature	Trophozoite	Cyst
Size	12-60 µm	10-20 µm
Nuclei	1	1-4 (mature = 4)
Motility	Active, unidirectional	None
Stool type	Loose/bloody	Formed
Ingested RBCs	Present (invasive)	Absent

8. ASCARIS LUMBRICOIDES - LIFE CYCLE

"Soil-transmitted helminth" - affects ~800 million people worldwide (Jawetz Medical Microbiology 28e)

Life Cycle Steps (Single Host: Human + Soil phase):

SOIL → Embryonated egg (infective)
  ↓ Ingested
SMALL INTESTINE → Larva hatches from egg
  ↓ Penetrates intestinal wall
PORTAL BLOOD → Larva migrates to LIVER
  ↓ Via inferior vena cava
RIGHT HEART → Lungs (pulmonary capillaries → alveoli)
  ↓ Larva matures in lung (Loeffler's syndrome: eosinophilia + pulmonary infiltrates)
TRACHEA → Larva coughed up to pharynx
  ↓ Swallowed
SMALL INTESTINE → Adult worm matures (15-35 cm long)
  ↓ Female lays 200,000 eggs/day
FECES → Eggs passed to soil (need 2-3 weeks in warm moist soil to embryonate)
  ↓ Embryonated egg is infective
SOIL → (Cycle repeats)

Key Facts for Viva:

Feature	Detail
Route of infection	Fecal-oral (ingestion of embryonated egg)
Infective stage	Embryonated egg (with L2 larva inside)
Diagnostic stage	Fertilized/unfertilized eggs in stool, adult worm
Lung migration	Causes Loeffler's syndrome (transient eosinophilia + pulmonary infiltrates)
Adult worm site	Jejunum of small intestine
Egg morphology	Bile-stained, mammilated (bosselated) outer coat; 60x45 µm
Worm size	Female 20-35 cm; Male 15-30 cm (male has curved tail)
Eggs per day	200,000 (female)
Soil requirement	2-3 weeks, warm moist soil for embryonation
Treatment	Albendazole (single dose) or Mebendazole
Complication	Intestinal obstruction (bolus of worms), biliary ascariasis

QUICK VIVA SUMMARY CARDS

Equipment Quick Reference:

Equipment	Temp/Parameter	Principle	Cannot Use For
Autoclave	121°C, 15 psi, 15-20 min	Moist heat protein denaturation	Heat-labile items
Hot air oven	160°C, 2 hours	Dry heat, oxidation	Rubber, plastic, media
Incubator (bacteria)	37°C	Temperature control	-
Incubator (fungi)	25-28°C	Temperature control	-
Membrane filter	0.2 µm pore size	Physical sieving	Viruses (too small)

Stain Quick Reference:

Stain	Organism Color	Background	Key Mechanism
Gram (G+)	Purple/blue	-	Thick peptidoglycan retains CV-I
Gram (G-)	Pink/red	-	Thin peptidoglycan; CV-I washes out
ZN (AFB)	Bright red	Blue	Mycolic acid binds carbol fuchsin
India ink	Clear halo	Black	Negative stain (capsule)
Giemsa	Violet parasites	Pink	Romanowsky-type stain

Organism Quick Reference:

Organism	Infective Stage	Diagnostic Stage	Host
Plasmodium	Sporozoite (via mosquito)	Ring/trophozoite/schizont/gametocyte in blood smear	Human + Anopheles mosquito
E. histolytica	Mature quadrinucleate cyst	Cyst (formed stool) / Trophozoite with RBCs (loose stool)	Human only
Ascaris	Embryonated egg	Egg in stool / adult worm	Human (+ soil phase)

Sources: Medical Microbiology 9e (Murray), Jawetz Melnick & Adelbergs Medical Microbiology 28e, Tietz Textbook of Laboratory Medicine 7e, CDC/DPDx Parasite Image Library

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Professional scientific illustration of a microbiology lab showing: compound microscope on bench, autoclave sterilizer, incubator, Bunsen burner with inoculation loop, petri dishes with bacterial colonies, staining rack with reagents, centrifuge. Clean modern laboratory background, teal and white color scheme, educational poster style.

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Four-panel diagram showing the Gram stain procedure in microbiology: Panel 1 - Apply Crystal Violet (purple, 1 min), Panel 2 - Apply Gram's Iodine mordant (brown, 1 min), Panel 3 - Decolorize with acetone-alcohol (colorless solvent), Panel 4 - Apply Safranin counterstain (pink, 1 min). Final result shows purple Gram-positive cocci and pink Gram-negative rods under microscope. Blue teal color scheme, clean scientific diagram style with clear labels.

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~/microbiology-pptx/build.js

const pptxgen = require("pptxgenjs");
const { execSync } = require("child_process");

// ── Colour palette ──────────────────────────────────────────────────────────
const C = {
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  midTeal:    "0F7285",   // header bars
  lightTeal:  "D6EEF2",   // card / panel backgrounds
  accent:     "E8A020",   // gold accent – highlights
  accentRed:  "C0392B",   // danger / Gram-negative
  accentPurp: "6A3F9E",   // Gram-positive
  white:      "FFFFFF",
  offWhite:   "F4F9FA",
  dark:       "1A1A2E",
  midGrey:    "64748B",
  lightGrey:  "CBD5E1",
  textDark:   "1E2D3D",
};

// ── Fetch all images as base64 ───────────────────────────────────────────────
const URLS = [
  "https://cdn.orris.care/image-gen/e8404ed01a824b8d88ff1e2d1b4d0140.png",   // 0 lab overview
  "https://cdn.orris.care/image-gen/ef602cb87fb64afdae2493974e7198d2.png",   // 1 gram stain steps
  "https://cdn.orris.care/image-gen/294b1550777f406eb115357e454dc183.png",   // 2 microscope
  "https://cdn.orris.care/image-gen/a73738d3490246e9b5883f541bb62b25.png",   // 3 autoclave
  "https://cdn.orris.care/image-gen/89a3e05a72c34dce8547b25556e2414d.png",   // 4 ZN stain
  "https://cdn.orris.care/cdss_images/fc6dce50ba9f55a0c34ea5fdd5a7de6a9db46381a71ba422d46dcf555c4f460d.png", // 5 Plasmodium
  "https://cdn.orris.care/cdss_images/b6239a182d21bd7040efc70ad0fbc087fa05a03b757cf626f630923a4c70fbf1.png", // 6 Entamoeba
  "https://cdn.orris.care/image-gen/cd114d64ef2e4f4fbb56f93b3cec15b6.png",   // 7 Ascaris
  "https://cdn.orris.care/image-gen/b04a46843c5a43b3834990b86c0ba888.png",   // 8 test kit
];

const imgs = JSON.parse(
  execSync(`node /home/daytona/skills/shared/scripts/fetch_images.js ${URLS.map(u=>`"${u}"`).join(" ")}`)
  .toString()
);

const img = (i) => imgs[i].base64;   // shorthand

// ── Helpers ──────────────────────────────────────────────────────────────────
function headerBar(slide, title, { bg = C.midTeal, fg = C.white } = {}) {
  slide.addShape("rect", { x: 0, y: 0, w: 10, h: 0.65, fill: { color: bg }, line: { type: "none" } });
  slide.addText(title, {
    x: 0.3, y: 0, w: 9.4, h: 0.65, fontSize: 18, bold: true,
    color: fg, valign: "middle", fontFace: "Calibri", margin: 0,
  });
}

function footerBar(slide, text = "Microbiology Practicals") {
  slide.addShape("rect", { x: 0, y: 5.35, w: 10, h: 0.28, fill: { color: C.darkTeal }, line: { type: "none" } });
  slide.addText(text, {
    x: 0.3, y: 5.35, w: 9.4, h: 0.28, fontSize: 8,
    color: "AACCCC", valign: "middle", fontFace: "Calibri", margin: 0,
  });
}

function sectionDivider(pres, sectionNum, sectionTitle, subtitle) {
  const s = pres.addSlide();
  // full-bleed dark bg
  s.addShape("rect", { x: 0, y: 0, w: 10, h: 5.625, fill: { color: C.darkTeal }, line: { type: "none" } });
  // accent stripe
  s.addShape("rect", { x: 0, y: 2.5, w: 10, h: 0.08, fill: { color: C.accent }, line: { type: "none" } });
  s.addText(`SECTION ${sectionNum}`, {
    x: 0.8, y: 1.6, w: 8.4, h: 0.5, fontSize: 13, bold: true, charSpacing: 6,
    color: C.accent, fontFace: "Calibri", align: "center",
  });
  s.addText(sectionTitle, {
    x: 0.8, y: 2.1, w: 8.4, h: 0.8, fontSize: 34, bold: true,
    color: C.white, fontFace: "Calibri", align: "center",
  });
  s.addText(subtitle, {
    x: 1.5, y: 3.0, w: 7, h: 0.45, fontSize: 14,
    color: "88BBCC", fontFace: "Calibri", align: "center",
  });
}

// ── BUILD PRESENTATION ───────────────────────────────────────────────────────
const pres = new pptxgen();
pres.layout = "LAYOUT_16x9";
pres.title  = "Microbiology Practicals";
pres.author = "Microbiology Department";

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 1 – TITLE
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  // left dark panel
  s.addShape("rect", { x: 0, y: 0, w: 4.8, h: 5.625, fill: { color: C.darkTeal }, line: { type: "none" } });
  // right panel
  s.addShape("rect", { x: 4.8, y: 0, w: 5.2, h: 5.625, fill: { color: C.offWhite }, line: { type: "none" } });
  // accent bar on seam
  s.addShape("rect", { x: 4.7, y: 0, w: 0.12, h: 5.625, fill: { color: C.accent }, line: { type: "none" } });

  s.addText("MICROBIOLOGY", {
    x: 0.3, y: 1.1, w: 4.2, h: 0.65, fontSize: 26, bold: true, charSpacing: 3,
    color: C.accent, fontFace: "Calibri", align: "center",
  });
  s.addText("PRACTICALS", {
    x: 0.3, y: 1.7, w: 4.2, h: 0.85, fontSize: 36, bold: true,
    color: C.white, fontFace: "Calibri", align: "center",
  });
  s.addText("A Comprehensive Laboratory Guide", {
    x: 0.3, y: 2.55, w: 4.2, h: 0.45, fontSize: 13,
    color: "99CCDD", fontFace: "Calibri", align: "center",
  });
  s.addShape("rect", { x: 0.7, y: 3.1, w: 3.4, h: 0.04, fill: { color: C.accent }, line: { type: "none" } });

  const topics = ["Equipment & Sterilization", "Staining Techniques", "Culture Methods", "Life Cycles of Pathogens", "Antibiotic Sensitivity Testing"];
  const topicText = topics.map((t, i) => [
    { text: `${["①","②","③","④","⑤"][i]}  `, options: { bold: true, color: C.accent } },
    { text: t, options: { color: C.textDark } },
    ...(i < topics.length - 1 ? [{ text: "\n", options: {} }] : []),
  ]).flat();
  s.addText(topicText, {
    x: 5.1, y: 1.3, w: 4.5, h: 3.0, fontSize: 13, fontFace: "Calibri",
    lineSpacingMultiple: 1.6,
  });

  s.addImage({ data: img(0), x: 5.0, y: 0, w: 5.0, h: 1.2, transparency: 20 });
}

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 2 – TABLE OF CONTENTS
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  s.addShape("rect", { x: 0, y: 0, w: 10, h: 5.625, fill: { color: C.offWhite }, line: { type: "none" } });
  headerBar(s, "TABLE OF CONTENTS");

  const sections = [
    ["01", "Laboratory Equipment & Test Kits",       "Microscope, Autoclave, BSC, Centrifuge, Media"],
    ["02", "Staining Techniques",                    "Gram Stain, ZN Stain, India Ink, Giemsa"],
    ["03", "Culture Media & Methods",                "Types of Media, Streak Plate, Selective/Differential"],
    ["04", "Life Cycles of Organisms",               "Plasmodium, Entamoeba, Ascaris lumbricoides"],
    ["05", "Antibiotic Sensitivity Testing",         "Kirby-Bauer, MIC, Breakpoints, Reporting"],
  ];

  sections.forEach(([num, title, sub], i) => {
    const y = 0.85 + i * 0.88;
    s.addShape("rect", { x: 0.35, y, w: 0.6, h: 0.62,
      fill: { color: i % 2 === 0 ? C.midTeal : C.accent }, line: { type: "none" } });
    s.addText(num, { x: 0.35, y, w: 0.6, h: 0.62, fontSize: 18, bold: true,
      color: C.white, align: "center", valign: "middle", fontFace: "Calibri", margin: 0 });

    s.addShape("rect", { x: 1.08, y: y + 0.04, w: 8.5, h: 0.55,
      fill: { color: C.white }, line: { color: C.lightGrey, pt: 0.5 },
      shadow: { type: "outer", color: "000000", blur: 4, offset: 1, angle: 135, opacity: 0.07 } });
    s.addText(title, { x: 1.2, y: y + 0.04, w: 5.5, h: 0.28, fontSize: 12, bold: true,
      color: C.textDark, fontFace: "Calibri", valign: "bottom", margin: 0 });
    s.addText(sub, { x: 1.2, y: y + 0.3, w: 7.0, h: 0.24, fontSize: 9,
      color: C.midGrey, fontFace: "Calibri", valign: "top", margin: 0 });
  });
  footerBar(s);
}

// ════════════════════════════════════════════════════════════════════════════
// SECTION 1 DIVIDER
// ════════════════════════════════════════════════════════════════════════════
sectionDivider(pres, "01", "Laboratory Equipment & Test Kits",
  "Instruments, Sterilization Methods & Consumables");

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 3 – MICROSCOPE
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  s.addShape("rect", { x: 0, y: 0, w: 10, h: 5.625, fill: { color: C.offWhite }, line: { type: "none" } });
  headerBar(s, "COMPOUND LIGHT MICROSCOPE – Parts & Functions");

  s.addImage({ data: img(2), x: 0.2, y: 0.75, w: 4.4, h: 4.6 });

  const parts = [
    ["Eyepiece (10×)", "Magnifies image from objective"],
    ["Revolving Nosepiece", "Holds & switches objective lenses"],
    ["Objectives", "4×, 10×, 40×, 100× (oil immersion)"],
    ["Stage & Clips", "Holds the glass slide"],
    ["Iris Diaphragm", "Controls light intensity"],
    ["Condenser", "Focuses light onto specimen"],
    ["Coarse/Fine Knobs", "Gross & precise focusing"],
    ["Oil Immersion (100×)", "Total magnification 1000×; resolving power 0.2 µm"],
  ];

  parts.forEach(([label, desc], i) => {
    const col = i < 4 ? 0 : 1;
    const row = i % 4;
    const x = 4.85 + col * 2.55;
    const y = 0.85 + row * 1.15;
    s.addShape("rect", { x, y, w: 2.4, h: 1.05,
      fill: { color: i % 2 === 0 ? C.white : C.lightTeal },
      line: { color: C.lightGrey, pt: 0.5 },
      shadow: { type: "outer", color: "000000", blur: 3, offset: 1, angle: 135, opacity: 0.08 } });
    s.addText(label, { x: x + 0.1, y: y + 0.04, w: 2.2, h: 0.3, fontSize: 9, bold: true,
      color: C.midTeal, fontFace: "Calibri", margin: 0 });
    s.addText(desc, { x: x + 0.1, y: y + 0.32, w: 2.2, h: 0.58, fontSize: 8,
      color: C.textDark, fontFace: "Calibri", margin: 0, wrap: true });
  });
  footerBar(s);
}

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 4 – AUTOCLAVE & STERILIZATION
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  s.addShape("rect", { x: 0, y: 0, w: 10, h: 5.625, fill: { color: C.offWhite }, line: { type: "none" } });
  headerBar(s, "AUTOCLAVE & STERILIZATION METHODS");

  s.addImage({ data: img(3), x: 0.2, y: 0.75, w: 4.2, h: 4.5 });

  // Autoclave specs box
  s.addShape("rect", { x: 4.6, y: 0.8, w: 5.1, h: 1.5,
    fill: { color: C.darkTeal }, line: { type: "none" },
    shadow: { type: "outer", color: "000000", blur: 5, offset: 2, angle: 135, opacity: 0.15 } });
  s.addText("AUTOCLAVE PARAMETERS", { x: 4.7, y: 0.82, w: 4.9, h: 0.3, fontSize: 9, bold: true,
    charSpacing: 2, color: C.accent, fontFace: "Calibri", margin: 0 });
  s.addText([
    { text: "Temperature: ", options: { bold: true, color: C.accent } },
    { text: "121°C\n", options: { color: C.white } },
    { text: "Pressure: ", options: { bold: true, color: C.accent } },
    { text: "15 psi (103 kPa)\n", options: { color: C.white } },
    { text: "Time: ", options: { bold: true, color: C.accent } },
    { text: "15–20 minutes", options: { color: C.white } },
  ], { x: 4.7, y: 1.12, w: 4.9, h: 1.1, fontSize: 11, fontFace: "Calibri",
    lineSpacingMultiple: 1.5, margin: 0 });

  // Sterilization methods table
  const methods = [
    ["METHOD", "TEMP / PARAM", "USE", true],
    ["Autoclave",           "121°C · 15 psi · 15 min",  "Media, glassware, instruments", false],
    ["Hot Air Oven",        "160°C · 2 hours",            "Glassware, metal, oils", false],
    ["Membrane Filter",    "0.2 µm pore",                "Heat-labile fluids (serum, antibiotics)", false],
    ["Ethylene Oxide gas", "RT, sealed chamber",         "Plastics, lensed instruments", false],
    ["UV Radiation",       "254 nm wavelength",          "Air / surface decontamination", false],
    ["Pasteurization",     "63°C / 30 min",              "Milk, beverages", false],
  ];
  const tw = [2.7, 2.2, 2.1];
  const tx = [4.6, 7.3];  // only 2 cols needed; 3rd continues
  const tColX = [4.6, 7.3, 8.55];
  const tColW = [2.6, 1.6, 1.75];
  methods.forEach(([m, p, u, isHdr], ri) => {
    const ty = 2.42 + ri * 0.44;
    const bg = isHdr ? C.midTeal : (ri % 2 === 0 ? C.white : C.lightTeal);
    const fc = isHdr ? C.white : C.textDark;
    s.addShape("rect", { x: 4.6, y: ty, w: 5.15, h: 0.42,
      fill: { color: bg }, line: { color: C.lightGrey, pt: 0.5 } });
    [[m, 0], [p, 1], [u, 2]].forEach(([txt, ci]) => {
      s.addText(txt, { x: tColX[ci] + 0.05, y: ty + 0.02, w: tColW[ci] - 0.1, h: 0.38,
        fontSize: isHdr ? 8 : 7.5, bold: isHdr, color: fc,
        fontFace: "Calibri", valign: "middle", margin: 0, wrap: true });
    });
  });
  footerBar(s);
}

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 5 – TEST KIT & CONSUMABLES
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  s.addShape("rect", { x: 0, y: 0, w: 10, h: 5.625, fill: { color: C.offWhite }, line: { type: "none" } });
  headerBar(s, "COMMON TEST KITS & CONSUMABLES");

  s.addImage({ data: img(8), x: 5.2, y: 0.72, w: 4.6, h: 4.7, transparency: 5 });

  const items = [
    ["Petri Dishes (90 mm)", "Solid culture, colony counting; inverted during incubation"],
    ["Inoculation Loop (1/10 µL)", "Streaking plates; sterilize by incineration in flame"],
    ["Swab + Stuart's Transport", "Specimen collection; maintains viability without growth"],
    ["Blood Culture Bottles", "Aerobic + anaerobic; CO₂ sensor detects growth"],
    ["McFarland 0.5 Standard", "~1.5×10⁸ CFU/mL; calibrates bacterial suspension for AST"],
    ["Kirby-Bauer Discs", "Antibiotic sensitivity testing; zone of inhibition in mm"],
    ["API Identification Strip", "20 biochemical tests in one strip for rapid ID"],
    ["Selective Media Plates", "Blood agar, MacConkey, CLED, TCBS, XLD"],
  ];

  items.forEach(([label, desc], i) => {
    const y = 0.82 + i * 0.6;
    s.addShape("rect", { x: 0.2, y, w: 0.32, h: 0.32,
      fill: { color: i % 2 === 0 ? C.midTeal : C.accent }, line: { type: "none" } });
    s.addText(`${i + 1}`, { x: 0.2, y, w: 0.32, h: 0.32, fontSize: 9, bold: true,
      color: C.white, align: "center", valign: "middle", fontFace: "Calibri", margin: 0 });
    s.addText(label, { x: 0.62, y, w: 4.3, h: 0.22, fontSize: 10, bold: true,
      color: C.midTeal, fontFace: "Calibri", margin: 0 });
    s.addText(desc, { x: 0.62, y: y + 0.21, w: 4.3, h: 0.3, fontSize: 8,
      color: C.midGrey, fontFace: "Calibri", margin: 0, wrap: true });
  });
  footerBar(s);
}

// ════════════════════════════════════════════════════════════════════════════
// SECTION 2 DIVIDER
// ════════════════════════════════════════════════════════════════════════════
sectionDivider(pres, "02", "Staining Techniques",
  "Gram Stain · Ziehl-Neelsen · Special Stains");

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 6 – GRAM STAIN
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  s.addShape("rect", { x: 0, y: 0, w: 10, h: 5.625, fill: { color: C.offWhite }, line: { type: "none" } });
  headerBar(s, "GRAM STAIN – Procedure, Principle & Results");

  s.addImage({ data: img(1), x: 0.2, y: 0.72, w: 4.5, h: 4.6 });

  const steps = [
    ["1", "Crystal Violet", "1 min", "All bacteria → purple", C.accentPurp],
    ["2", "Gram's Iodine",  "1 min", "CV-iodine complex forms (mordant)", "4A6FA5"],
    ["3", "Acetone-Alcohol","5-10 sec","G+ retains purple  |  G− loses colour", "2E8B57"],
    ["4", "Safranin",       "1 min", "G− counterstained → pink/red", C.accentRed],
  ];

  steps.forEach(([num, reagent, time, result, color], i) => {
    const y = 0.82 + i * 1.17;
    s.addShape("rect", { x: 4.85, y, w: 4.9, h: 1.08,
      fill: { color: C.white }, line: { color: C.lightGrey, pt: 0.5 },
      shadow: { type: "outer", color: "000000", blur: 3, offset: 1, angle: 135, opacity: 0.08 } });
    s.addShape("rect", { x: 4.85, y, w: 0.38, h: 1.08,
      fill: { color }, line: { type: "none" } });
    s.addText(`${num}`, { x: 4.85, y, w: 0.38, h: 1.08, fontSize: 16, bold: true,
      color: C.white, align: "center", valign: "middle", fontFace: "Calibri", margin: 0 });
    s.addText(reagent, { x: 5.3, y: y + 0.04, w: 4.3, h: 0.28, fontSize: 11, bold: true,
      color: C.textDark, fontFace: "Calibri", margin: 0 });
    s.addText(`⏱ ${time}`, { x: 5.3, y: y + 0.3, w: 1.2, h: 0.22, fontSize: 8,
      color: C.midGrey, fontFace: "Calibri", margin: 0 });
    s.addText(result, { x: 5.3, y: y + 0.52, w: 4.3, h: 0.46, fontSize: 9,
      color: color, fontFace: "Calibri", margin: 0, wrap: true });
  });

  // principle footnote
  s.addShape("rect", { x: 0.2, y: 5.05, w: 9.6, h: 0.35,
    fill: { color: C.lightTeal }, line: { type: "none" } });
  s.addText("Principle: Thick peptidoglycan (G+) retains CV-iodine complex on decolorization. Thin peptidoglycan + outer lipid membrane (G−) allows CV-iodine to wash out → counterstained pink by safranin.",
    { x: 0.3, y: 5.05, w: 9.4, h: 0.35, fontSize: 8, color: C.darkTeal,
      fontFace: "Calibri", valign: "middle", margin: 0, wrap: true });
  footerBar(s);
}

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 7 – ZN STAIN
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  s.addShape("rect", { x: 0, y: 0, w: 10, h: 5.625, fill: { color: C.offWhite }, line: { type: "none" } });
  headerBar(s, "ZIEHL-NEELSEN (ZN) STAIN – Acid-Fast Technique");

  s.addImage({ data: img(4), x: 5.2, y: 0.72, w: 4.6, h: 4.5 });

  // Steps
  const znSteps = [
    ["1", "Hot Carbol Fuchsin", "Heat to steam, 5 min", "All organisms → red", C.accentRed],
    ["2", "20% H₂SO₄ / 3% HCl-Alcohol", "3–5 min decolorize", "Non-AFB lose colour; AFB retains red", C.midGrey],
    ["3", "Methylene Blue counterstain", "1 min", "Non-AFB / background → blue", "2A7FBF"],
  ];
  znSteps.forEach(([num, reagent, time, result, color], i) => {
    const y = 0.82 + i * 1.0;
    s.addShape("rect", { x: 0.2, y, w: 4.7, h: 0.9,
      fill: { color: C.white }, line: { color: C.lightGrey, pt: 0.5 },
      shadow: { type: "outer", color: "000000", blur: 3, offset: 1, angle: 135, opacity: 0.08 } });
    s.addShape("rect", { x: 0.2, y, w: 0.38, h: 0.9,
      fill: { color }, line: { type: "none" } });
    s.addText(num, { x: 0.2, y, w: 0.38, h: 0.9, fontSize: 16, bold: true,
      color: C.white, align: "center", valign: "middle", fontFace: "Calibri", margin: 0 });
    s.addText(reagent, { x: 0.68, y: y + 0.04, w: 4.1, h: 0.25, fontSize: 10, bold: true,
      color: C.textDark, fontFace: "Calibri", margin: 0, wrap: true });
    s.addText(`${time}  →  ${result}`, { x: 0.68, y: y + 0.34, w: 4.1, h: 0.48, fontSize: 8.5,
      color: C.midGrey, fontFace: "Calibri", margin: 0, wrap: true });
  });

  // Special stains table
  s.addShape("rect", { x: 0.2, y: 3.18, w: 4.7, h: 0.28,
    fill: { color: C.midTeal }, line: { type: "none" } });
  s.addText("OTHER IMPORTANT STAINS", { x: 0.3, y: 3.18, w: 4.5, h: 0.28, fontSize: 9, bold: true,
    color: C.white, fontFace: "Calibri", valign: "middle", margin: 0 });

  const specials = [
    ["India Ink/Nigrosin", "Cryptococcus neoformans – capsule (clear halo)"],
    ["Albert's Stain",     "C. diphtheriae – metachromatic granules"],
    ["Giemsa Stain",       "Malaria, Leishmania, Borrelia (Romanowsky)"],
    ["PAS Stain",          "Fungal cell walls – magenta/pink"],
    ["Calcofluo White",    "Fungi – fluorescent blue-white under UV"],
  ];
  specials.forEach(([stain, use], i) => {
    const y = 3.48 + i * 0.39;
    s.addShape("rect", { x: 0.2, y, w: 4.7, h: 0.36,
      fill: { color: i % 2 === 0 ? C.white : C.lightTeal }, line: { color: C.lightGrey, pt: 0.5 } });
    s.addText(stain, { x: 0.28, y: y + 0.02, w: 1.8, h: 0.3, fontSize: 8.5, bold: true,
      color: C.midTeal, fontFace: "Calibri", valign: "middle", margin: 0 });
    s.addText(use, { x: 2.1, y: y + 0.02, w: 2.7, h: 0.3, fontSize: 8,
      color: C.textDark, fontFace: "Calibri", valign: "middle", margin: 0, wrap: true });
  });
  footerBar(s);
}

// ════════════════════════════════════════════════════════════════════════════
// SECTION 3 DIVIDER
// ════════════════════════════════════════════════════════════════════════════
sectionDivider(pres, "03", "Culture Media & Methods",
  "Types of Media · Streaking · Incubation");

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 8 – CULTURE MEDIA
// ════════════════════════════════════════════════════════════════════════════
{
  const s = pres.addSlide();
  s.addShape("rect", { x: 0, y: 0, w: 10, h: 5.625, fill: { color: C.offWhite }, line: { type: "none" } });
  headerBar(s, "CULTURE MEDIA – Types & Classification");

  const mediaTypes = [
    { title: "NUTRIENT / GENERAL", color: C.midTeal, items: ["Nutrient Agar / Broth", "Brain-Heart Infusion (BHI)", "Tryptic Soy Agar (TSA)", "→ Supports growth of most organisms"] },
    { title: "SELECTIVE", color: "1A7F4B", items: ["MacConkey Agar (Gram-neg)", "TCBS (Vibrio)", "Mannitol Salt Agar (Staph)", "→ Inhibits unwanted organisms"] },
    { title: "DIFFERENTIAL", color: "8B6914", items: ["Blood Agar (haemolysis)", "CLED (UTI pathogens)", "Eosin Methylene Blue (EMB)", "→ Distinguishes by colony appearance"] },
    { title: "ENRICHED", color: C.accentPurp, items: ["Chocolate Agar (heated blood)", "Löwenstein-Jensen (TB)", "Thayer-Martin (Neisseria)", "→ For fastidious organisms"] },
    { title: "ENRICHMENT BROTH", color: C.accentRed, items: ["Selenite F (Salmonella)", "Alkaline Peptone Water (Vibrio)", "GN Broth (Enterobacteriaceae)", "→ Increase yield from mixed flora"] },
    { title: "TRANSPORT MEDIA", color: "4A8A9C", items: ["Stuart's Medium", "Viral Transport Medium (VTM)", "Thioglycollate Broth (anaerobes)", "→ Preserves viability in transit"] },
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        fontFace: "Calibri", margin: 0, wrap: true });
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  footerBar(s);
}

// ════════════════════════════════════════════════════════════════════════════
// SECTION 4 DIVIDER
// ════════════════════════════════════════════════════════════════════════════
sectionDivider(pres, "04", "Life Cycles of Organisms",
  "Plasmodium · Entamoeba histolytica · Ascaris lumbricoides");

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 9 – PLASMODIUM LIFE CYCLE
// ════════════════════════════════════════════════════════════════════════════
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  headerBar(s, "PLASMODIUM – Life Cycle (Malaria)");

  s.addImage({ data: img(5), x: 0.2, y: 0.72, w: 5.1, h: 4.7 });

  const facts = [
    ["Definitive Host", "Female Anopheles mosquito (sexual cycle)"],
    ["Intermediate Host", "Human (asexual cycle)"],
    ["Infective Stage", "Sporozoites (inoculated via mosquito bite)"],
    ["Pre-erythrocytic", "Sporozoites → Liver → Schizonts → Merozoites"],
    ["Erythrocytic Cycle", "Ring → Trophozoite → Schizont → Merozoites (48-72 h)"],
    ["Gametocytes", "Some merozoites → male + female gametocytes"],
    ["Hypnozoites", "P. vivax / P. ovale → dormant liver forms → RELAPSE"],
    ["Diagnostic Stage", "Thick + thin blood film (Giemsa-stained)"],
  ];

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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 10 – ENTAMOEBA HISTOLYTICA
// ════════════════════════════════════════════════════════════════════════════
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  headerBar(s, "ENTAMOEBA HISTOLYTICA – Life Cycle & Diagnosis");

  s.addImage({ data: img(6), x: 0.2, y: 0.72, w: 4.6, h: 4.7 });

  // Two-stage header
  const stages = [
    { title: "CYST  (Infective Stage)", bg: C.midTeal, points: [
      "Quadrinucleate (4 nuclei) mature cyst",
      "Passed in FORMED stools",
      "Survives weeks-months in damp environment",
      "Resistant to chlorination",
      "Infects via contaminated food/water",
    ]},
    { title: "TROPHOZOITE  (Pathogenic Stage)", bg: C.accentRed, points: [
      "Actively motile via pseudopodia (directional)",
      "Found in LOOSE / BLOODY stools",
      "Ingested RBCs = hallmark of invasive disease",
      "Can invade colonic wall → flask-shaped ulcers",
      "Spreads via blood → liver abscess (MC extra-intestinal)",
    ]},
  ];

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  footerBar(s);
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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 11 – ASCARIS LUMBRICOIDES
// ════════════════════════════════════════════════════════════════════════════
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  headerBar(s, "ASCARIS LUMBRICOIDES – Life Cycle (Soil-Transmitted Helminth)");

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    ["②", "Hatches in small intestine → L2 larva", C.midTeal],
    ["③", "Larva penetrates intestinal wall → portal blood → LIVER", C.midTeal],
    ["④", "Larva → right heart → lungs (alveoli) = Loeffler's syndrome", C.accentRed],
    ["⑤", "Larva coughed up → swallowed → small intestine", C.midTeal],
    ["⑥", "Adult worm matures in jejunum (female 20–35 cm)", C.midTeal],
    ["⑦", "Female lays 200,000 eggs/day → passed in feces", C.accent],
    ["⑧", "Eggs embryonate in warm moist soil (2–3 weeks)", C.midGrey],
  ];

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  footerBar(s);
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// ════════════════════════════════════════════════════════════════════════════
// SECTION 5 DIVIDER
// ════════════════════════════════════════════════════════════════════════════
sectionDivider(pres, "05", "Antibiotic Sensitivity Testing",
  "Kirby-Bauer Disc Diffusion · MIC · Interpretation");

// ════════════════════════════════════════════════════════════════════════════
// SLIDE 12 – AST
// ════════════════════════════════════════════════════════════════════════════
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  headerBar(s, "ANTIBIOTIC SENSITIVITY TESTING – Kirby-Bauer Method");

  // Steps panel
  const steps = [
    ["1. Prepare inoculum", "Adjust turbidity to McFarland 0.5 standard (~1.5×10⁸ CFU/mL)"],
    ["2. Inoculate plate", "Flood Mueller-Hinton Agar; rotate plate 60° × 3 for even lawn"],
    ["3. Apply antibiotic discs", "Place Kirby-Bauer discs with dispenser; press gently"],
    ["4. Incubate", "37°C for 16–18 hours (bacteria) or 24–48 h (fungi)"],
    ["5. Measure zones", "Measure zone of inhibition (mm) from back of plate"],
    ["6. Interpret (CLSI/EUCAST)", "Compare to breakpoints → S (Sensitive), I (Intermediate), R (Resistant)"],
  ];

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  // Key concepts right panel
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    ["Mueller-Hinton Agar", "Standard medium for AST; low sulfonamide inhibitors"],
    ["Zone of Inhibition", "Area of no growth around disc = antibiotic diffusion zone"],
    ["MIC", "Minimum Inhibitory Concentration – lowest conc. that inhibits visible growth"],
    ["CLSI / EUCAST", "International breakpoint guidelines for S / I / R classification"],
    ["Inducible Resistance", "D-zone test (clindamycin + erythromycin) for D-test"],
    ["ESBL Detection", "Double disc synergy test – screen for extended spectrum beta-lactamase"],
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  footerBar(s);
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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 13 – VIVA QUICK REFERENCE
// ════════════════════════════════════════════════════════════════════════════
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  headerBar(s, "VIVA QUICK REFERENCE – Key Facts to Remember");

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    { title: "Autoclave", color: C.midTeal, lines: ["121°C · 15 psi · 15–20 min", "Biological indicator: B. stearothermophilus", "Cannot use for heat-labile items"] },
    { title: "Gram Stain", color: C.accentPurp, lines: ["CV → Iodine → Acetone-alcohol → Safranin", "G+ = Purple  |  G− = Pink", "Over-decolorize → false G-negative"] },
    { title: "ZN Stain", color: C.accentRed, lines: ["Hot carbol fuchsin + acid decolorize", "AFB = Red  |  Background = Blue", "Mycolic acid = acid-fastness mechanism"] },
    { title: "Membrane Filter", color: "2E7D6B", lines: ["Pore size 0.2 µm removes bacteria", "Does NOT remove viruses", "Used for heat-labile fluids (serum, antibiotics)"] },
    { title: "Plasmodium", color: "7B3F00", lines: ["Sporozoite = infective; Gametocyte = diagnostic", "Hypnozoites → relapse (P. vivax, P. ovale)", "Treat with primaquine for hypnozoites"] },
    { title: "Entamoeba", color: "C0392B", lines: ["Infective = mature cyst (4 nuclei)", "Diagnostic = trophozoite with ingested RBCs", "MC extra-intestinal = liver abscess"] },
    { title: "Ascaris", color: "1A5276", lines: ["Infective = embryonated egg", "Lung migration → Loeffler's syndrome", "Female lays 200,000 eggs/day"] },
    { title: "Kirby-Bauer AST", color: "6B4226", lines: ["McFarland 0.5 = 1.5×10⁸ CFU/mL", "Mueller-Hinton agar · 37°C · 16–18 h", "Breakpoints: S / I / R (CLSI or EUCAST)"] },
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// ════════════════════════════════════════════════════════════════════════════
// SLIDE 14 – CLOSING
// ════════════════════════════════════════════════════════════════════════════
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  const summary = [
    "Equipment & Sterilization  •  Gram & ZN Staining",
    "Culture Media  •  Life Cycles  •  Antibiotic Sensitivity Testing",
  ];
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  s.addText("Sources: Medical Microbiology 9e (Murray) · Jawetz Medical Microbiology 28e · Sherris & Ryan's Medical Microbiology 8e",
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      fontFace: "Calibri", align: "center" });
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// ════════════════════════════════════════════════════════════════════════════
// WRITE FILE
// ════════════════════════════════════════════════════════════════════════════
pres.writeFile({ fileName: "/home/daytona/workspace/microbiology-pptx/Microbiology_Practicals.pptx" })
  .then(() => console.log("SUCCESS: Microbiology_Practicals.pptx written"))
  .catch(e => { console.error("ERROR:", e); process.exit(1); });

Running Command

cd /home/daytona/workspace/microbiology-pptx && node build.js 2>&1

Running Command

cd /home/daytona/workspace/microbiology-pptx && node -e " const {execSync} = req…

Editing File

~/microbiology-pptx/build.js

Successfully replaced 1 instance(s) of the string in '/home/daytona/workspace/microbiology-pptx/build.js'

Editing File

~/microbiology-pptx/build.js

Successfully replaced 1 instance(s) of the string in '/home/daytona/workspace/microbiology-pptx/build.js'

Running Command

cd /home/daytona/workspace/microbiology-pptx && node build.js 2>&1

Running Command

ls -lh /home/daytona/workspace/microbiology-pptx/Microbiology_Practicals.pptx

Your presentation is ready! Here's your download link:

Microbiology Practicals

Presentation · PPTX

(8.4 MB)

What's Inside (14 Slides)

Slide	Content
1	Title slide - split-panel teal/white design with topic overview
2	Table of Contents with 5 numbered sections
3	Section 1 divider
4	Compound Microscope - labelled diagram + 8 parts/functions cards
5	Autoclave & Sterilization - cross-section diagram + full methods table
6	Test Kits & Consumables - 8 labelled items with uses
7	Section 2 divider
8	Gram Stain - 4-step procedure diagram with colour-coded steps + principle
9	ZN Stain - 3-step procedure + special stains quick-reference table
10	Section 3 divider + Culture Media - 6 type cards (nutrient, selective, differential, enriched, enrichment, transport)
11	Section 4 divider
12	Plasmodium life cycle - textbook diagram (Medical Microbiology 9e) + key facts table
13	Entamoeba histolytica - textbook diagram + cyst vs trophozoite comparison
14	Ascaris lumbricoides - life cycle diagram + 8-step migration pathway
15	Section 5 + Antibiotic Sensitivity Testing - Kirby-Bauer 6-step protocol + key concepts
16	Viva Quick Reference - 8 colour-coded memory cards
17	Closing slide

Design: Deep teal + gold accent palette, shadow cards, section dividers, all slides have header bars and footers.

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