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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.
DEFICIENCY DISEASES Animals may suffer from diseases caused by deficiencies of energy and proteins, mineral nutrients and vitamins, which generally occur either due to deficiency
Acellular and Cellular Organisms you should be able to characterise living and non- living matter. However, the boundary-line between the two is not very precise. As you have
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Guar Gum Guar Gum is derived from seed of legume Cyamopsis tetragonalobus resembling soyabean plant. Guar gum is composed of Galactomannan Galactose: mannose in the ratio 1:2.
write a note on mode of nutrition
write short notes on sex limited traits.
In some types of cells, the cell membrane present differentiations that are essential for the specific functions of the cells. The major differentiations are the microvilli and the
Examine the cysticerus larva under the microscope? Examine the cysticerus larva under the microscope and note the following: i) Bladder worm consists of a single layered, l
Cellular Totipotency The innumerable cells which constitute the body of a higher plant or animal and containing identical genetic material can be traced to a single cell-the
Determine Causes of Iron Deficiency Anaemia? Dietary Inadequacy Poor bioavailability of iron Presence of absorption interfering substances in diet Poverty and
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