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Define Preparation of Dilutions - Standard or Total Plate Counts?
1. Serial dilution of homogenized sample in an appropriate diluent.
Preparation of dilutions - Decimal dilutions are prepared in a diluent [peptone water (1%) and 0.5% NaCl] and some dilutions are plated. Selection of the dilutions to be plated is made on the basis of expected microbial load in the sample.
2. Plating on to suitable agar medium by pour plate or surface plating.
3. Incubation of plates at appropriate temperature (usually 35-37°C) for a given time (24-48 hours).
4. Counting of all visible colonies manually or using a Quebec or electronic counter.
5. Calculating CFU/ml or CFU/gm of the food sample.
Define Precautions for Determination of Haemoglobin Content in Blood 1. Potassium cyanide is highly toxic and hence drabkin's solution should not be pippeted by mouth. 2. Dr
In Drosophila, these genes occur on chromosome 4. H - wild type (normal) h - hairy F - wild type f - frizzled E - wild type e - vest
How are fruits formed? The fecundation in angiosperms triggers the release of hormones that act upon the ovaries. The ovary wall then makes into a fruit that having the seeds.
Q. Define Low - density lipoprotein? Ans. LDL is the major cholesterol-rich lipoprotein carrying approximately 70 per cent of plasma cholesterol. It serves to transport ch
Explain the Changes in Body Tissue Compartments - Underweight? The severity of nutritional deprivation determines the extent of changes in the body tissue compartments. The fir
Giant chromosomes
An electronic chip is to be implanted in the body. During in vitro (in the lab) testing it is observed that the chip will dissolve over time if exposed to liquid with similar pH to
In humans, attached earlobes are a dominant feature over free earlobes while hypertrichosis of the ear is a holandric (Y-linked) feature. A person with attached earlobes and extens
Explain the senses taste and smell ? The pigmented cone cells of the retina transmit information to bipolar nerve cells, then to ganglion cells, and on to the optic nerve and t
Explain Cis-trans isomers Atoms or groups are called cis or trans to one another when they project respectively on the same or on opposite sides of a reference plane identi
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