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Explain the Gram Staining technique?
Gram staining is a differential staining procedure which divides bacteria into two groups: Gram positive and Gram negative, based on staining properties. The gram stain was developed in 1884 by the Danish Physician, Dr. Christian Gram. It is one of the most important and widely employed staining procedure in bacteriology.
It is very useful and is almost essential in identifying an unknown bacteria. The basis of gram staining is the difference in cell wall composition of two types of bacterial cells. Gram positives have thick cell wall, made up of multi-layered peptidoglycan with extensive cross-linking. On the other hand, gram negative cell wall has a very thin peptidoglycan layer surrounded by outer lipid rich outer membrane. There is no outer membrane in case of gram positives. This difference in cell wall leads to decolourization of gram negatives but not gram positives by decolourizing agent i.e., ethanol or acetone.
What term is used to describe the range of organisms in a habitat
ADAP T A TIO N - Characters that make an organism to adjust well and suited to its way of life. Variation occur in living organism due to change in environment. Th
Secondary Production - Ecosystem The net primary production is the only energy available to consumers or heterotrophs including man. Herbivores such as cow or deer gaze upon
Explain National Programmes Targeting Infants and Preschoolers? Infants and preschoolers are the vulnerable sections of the society. To give them due coverage, some national p
Minerals :- Sodium Food Source NaCl, MSG, other food additives, milk, low in most raw foods Nutritional Functional role Essential nutrient: Deficiency is ra
Leptontene: The chromosomes becomes visible, shorten and thick. The size of the nucleus increase. The homologous chromosomes start getting closer to each other. Z
Explain about the Oncogenic Viruses? Certain viruses that interfere with the functions of the regulatory genes have been identified. These viruses are called oncogenic viruses.
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What are the in-vivo imaging techniques The first of the in-vivo imaging techniques, computer tomography (CT) scanning, came on stream in the early 1970s. As technologies devel
State in brief about the nuclear DNA The nuclear DNA is distributed between two or more chromosomes, the number of which varies among different eukaryotes, and is characterist
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