140mic General Microbiology

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Presentation transcript:

140mic General Microbiology Madeha Al-Onazi

SIMPLE STAIN + NEGATIVE STAIN LAB 6 Staining SIMPLE STAIN + NEGATIVE STAIN

PURPOSE To recognize the three basic shapes of bacterial cells.

THE THREE COMMON SHAPES OF BACTERIA

1- Coccus Having one of the following arrangements:  Diplococcus: a pair of cocci  Streptococcus: a chain of cocci  Tetrad: a square of 4 cocci  Sarcina: a cube of 8 cocci  Staphylococcus: cocci in irregular, often grape-like clusters

2-Bacillus.  Bacillus: a single bacillus  Streptobacillus: bacilli in chains  Coccobacillus: oval and similar to a coccus

3-Spiral  Vibrio: an incomplete spiral or comma-shaped  Spirillum: a thick, rigid spiral  Spirochete: a thin, flexible spiral

SIMPLE STAIN

SIMPLE STAIN :  The simple stain is a very simple staining procedure involving only one stain.  You may choose from methylene blue, safranin, and crystal violet.

The Method 1. Prepare the smear. - place a small drop of water on a clean slide. Drag the sterile inoculating needle tip through the edge of colony. - Gently spread the mixture into a circle to spread out.

SIMPLE STAIN : 2. Let the smear air dry completely.

SIMPLE STAIN : 3. Heat-Fix the smear.  Smears are heat-fixed by quickly passing the slide through a flame two or three times.  This causes the microbes to stick to the slide and not get washed off during the staining process.

SIMPLE STAIN : 4. Stain the smear.  Place the slide on a rack over the sink. Flood the smear with stain and let it for 60-90 seconds. Rinse gently and blot dry.

SIMPLE STAIN : 5. Then, place a drop of oil directly on the stained smear .Turn the oil lens into position and fine focus to observe the cells.

RESULT

Coccus (cocci pl.)

Bacillus (Bacilli pl.)

Spirillum (Spirilli pl.)

NEGATIVE STAIN

NEGATIVE STAIN 1. Place a very small drop of nigrosin near one end of a well- cleaned and flamed slide. 2. Remove a small amount of the culture with an inoculating loop and disperse it in the drop of stain . 3. Use another clean slide to spread the drop of stain containing the organism using the following technique.

NEGATIVE STAIN 5. Allow the smear to dry without heating. 6. Observe the cells with microscope.

NEGATIVE STAIN

RESULT Negatively Stained Bacillus Negatively Stained Cocci