It is the preservation of food in sealed containers, usually after the application of heat, through steam under pressure. During the process of canning part of the micro-organisms are destroyed and the rest are rendered inactive.
In those places where water works cannot be constructed, water may be purified on a small scale by the following methods:
The process of dehydration is based upon the fact that if bacteria are deprived of water for a long period they do not usually cause spoilage of foods.
Food preparation is much more than a science; it is an art: for it is linked with the total cultural pattern of people. Food preparation requires a sense of discrimination in the blending of flavours as well as of textures, colours and shapes.
Elasticity of demand is known as price-elasticity of demand. Because elasticity of demand is the degree of change in amount demanded of a commodity in response to a change in price.
Two methods are available for the staining of protozoa: 1) Iron-haematoxylin stain 2) Wheatley's tnchome stain. The iron haematoxylin staining is the older method and is more difficult.
It is done by Zeal Nelson's method. It is based on the fact that after staining with aniline dyes, tubercle bacilli resist discolor- station with acids. It consists of 3 steps.
Notes on the origin, methods and important of Gram staining . Apply methyl violet over the bacterial smear in a slide. Stain for one minute. Then wash off the stain with water.
Some of the permanent methods for effective birth control are as follows: Sterilization can be done for either males or females. The advantages of sterilization are:
They include i. Basal body temperature (BPT) ii. Cervical mucus method iii. Symptothermic method. These methods involve recognition of some physiological signs and symptoms associated with ovulation.