Explain precautions for gram staining of bacterial cultures, Biology

Assignment Help:

Explain Precautions for Gram Staining of Bacterial Cultures?

1. Heat fix the smear, otherwise cells would be washed off.

2. Fresh 24 hrs old culture should be used. Gram variability can be seen in old culture. Since with age gram Positives lose their ability to retain primary stain, in gram variability some cells appear purple and others appear red.

3. Decolourization is a critical step. Decolourization is done till the colour of the primary stain comes out. Over-decolourization can make gram positives appear gram negatives and under decolourization can cause gram negatives to appear as gram positives.

4. Slide should be thoroughly washed after every step to remove excess reagent under running water or water applied with an eye dropper.

 


Related Discussions:- Explain precautions for gram staining of bacterial cultures

Plant physiology, detail notes on seed dormancy and seed germination

detail notes on seed dormancy and seed germination

How is the large size of some cephalopods, How is the large size of some ce...

How is the large size of some cephalopods related to the type of circulatory system they present? In cephalopods the circulatory system is closed and this gives more speed and

In which phase mother exchanges substances to fetus, Exchange of oxygen, nu...

Exchange of oxygen, nutrients, carbon dioxide and waste products from mother to fetus takes place through diffusion across the: a) Chorionic villi (pron: core-e-on-ick villi)

Determine the parathryroid hormone receptors, Which of the following serves...

Which of the following serves as an effector, or part of an effector, that functions in a negative feedback system? A. 1,25-dihydroxyvitamin D Receptors located intracellularly

Explain theory or principle of determination of coliforms, Explain Theory o...

Explain Theory or Principle of Determination of Coliforms? Coliforms are gram negative, non-spore forming, facultative anaerobic bacteria which produce acid and gas on lactose

What is counsellor, Q. What is Counsellor? Counsellor is someone who gi...

Q. What is Counsellor? Counsellor is someone who gives advice about the problem. A counselor's role is to help patients help themselves. In our context  a counsellor is  a comm

Disorders of liver, DISORDERS OF LIVER: In the foregoing  sections and...

DISORDERS OF LIVER: In the foregoing  sections and sub-sections we have discussed about the common disorders of upper and lower gastrointestinal  tract. Now we shall discuss

Biological evolution, Natural selection is a process which directs all biol...

Natural selection is a process which directs all biological evolution. It is a process that directs genetic changes which when proved to be adapted to the environment are retaine

Calculate the frequencies of heterozygotes, If dimples may be considered a ...

If dimples may be considered a single-gene dominant trait, and 64% of the population features dimples, calculate the frequencies of heterozygotes and both types of homozygotes, ass

Illustrate the applications of vitamin B6, Illustrate the Applications of v...

Illustrate the Applications of vitamin B 6 The heating processes employed in the industry for the sterilization of milk based formulations will greatly reduce their vitamin B

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd