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Q. Describe the Morphological Characteristics?
One of the first steps in the identification of bacteria in food is microscopic examination to ascertain the shape, size, aggregation, structure and staining reactions of the bacteria present. The following characteristics may be of special significance:
Encapsulation: The presence of capsules or slime may account for sliminess or ropiness of a food. Most capsules are polysaccharides of dextrin; dextran or levan and they serve as a source of reserve nutrients and increase the resistance of bacteria under adverse conditions.
Formation of Endospores: Bacteria of genera Bacillus, Clostridium, Sporosarcina etc have the ability to form endospores. Endospores are formed at an intracellular site and are resistant to heat, ultraviolet light and desiccation. Lysis of the vegetative cell releases the free endospore, which may remain dormant with no detectable metabolism for years. Sporulation usually appears in the late logarithmic phase of growth, possibly because of nutrient depletion or product accumulation. The acquisition of heat resistance is closely related to the formation of dipicolinic acid and the Ca2+ uptake. Germination is favoured by conditions that are favourable for growth.
Formation of Cell Aggregates: It is characteristic of some bacteria to form long chains or of others to clump under certain conditions. It is more difficult to kill all bacteria in intertwined chains or sizable clumps than to destroy separate cells.
Alcohol Related Emergencies: Alcohol is one of the most serious health problems. Alcoholism is defined as a primary or chronic disease with genetic, psychological and environ
Explain Fontan Operation ? The original Fontan operation was done in a case where classical Glenn operation had been done (end-Lo-end anastomosis of superior vena cava and lig
functions of iron in the body: Iron is the major component in haemoglobin. It helps to carryout oxygen from lungs to the tissues. About 60 to 70% of Iron in the body i
What is the mode of nutrition of Ascaris?
Dot blot is the technique for measuring the amount of one perticular DNA or RNA in the highly complex mixture. The samples are spotted onto the hybridization membrane (like nitroc
Q. What are introns, and how do they affect the processing of genetic information? Introns, a feature of eukaryotic DNA, are intervening stretches of DNA lying between the exon
What is Iron Overload and Toxicity? We have seen that absorption of iron is very effectively regulated. This prevents overload of the tissues with iron from diet/supplements in
Explain the Importance of nicotinic acid Nicotinic acid is successfully used in the therapy of a number of vascular disorders such as vascular spasms, angina pectoris, arthriti
Q. What is parasitism? The Parasitism is the ecological interaction in which a being lives at the expense of another. The parasite often doesn't cause immediate death of the ho
Anti Platelet Drugs In the early years of CABG, patients used to be put on aspirin and persantin (Dipyridamole). Persantin is not routinely prescribed now. Aspirin dose can b
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