principles of development

. In 1858, a German biologist Rudolph Virchow found that all living cells arise from pre-existing cells ('omniscellula e cellula'). In 1866 Ernst Haeckel suggested that nucleus might store and transmit the hereditary information. The improvement made in the field of microscopes and techniques for t..

It is the study of principles and practices of developing drugs for therapeutic use in man, animals and plant..

Principle of electrostatics and electromagnetism play a very vital role in all modern scientific developments. Coulomb's law may be regarded as merely a special case of Gauss' law or we can say Gauss's law is generated form of Coulomb's law. Gauss' law makes it possible to calcu..

It is also called Nuclear Magnetic Resonance (NMR) spectroscopy as it is based on this phenomenon. It is a diagnostic technique that provides high quality cross-sectioned two or three - dimensional images of organs without having X-rays or other radiations. This technique is based on the Princ..

The laser is an acronym for Light Amplification by Stimulated Emission of Radiation. The laser has been invented and developed in 1959 and 1960. In the laser, the maser principle has been extended to optical or visible light frequencies of 10 1 4 to 10 1 5 cycle/s. Laser may be ..

What is the need for studying Biology? The study of Biology becomes important for the following reasons: It brings about an awareness of the rich diversity of life forms that inhabit the Planet Earth It helps us to know and appreciate the precision and complexity of living processes An under..

The excess pressure that must be applied to the solution/conc.solution to prevent osmosis. fig 3.11 - Principle of measuring osmotic pressure fig 3.12 If two solutions of identical composition but different concentration are separated by a semi permeable membr..

With world wide awareness about dangers of persisting pesticides in food crops, enormous interest is shown in food grown on organic farming principles. Such food is called organic food . Organic farming is a method of farming wherein synthetic chemical is not used in any form - either to ..

Biotechnology is science of manufacturing useful substances, chemicals, medicines by use of living organisms and their life process. In fact, biotechnology is not a new science. Alcohol was the first product manufactured by ancient biotechnologist. In recent years, biotechnology is growing as a sep..

A wide variety of physiological processes are carried out unconsciously by the endocrine system through chemical messengers called "hormones." The endocrine system is a collection of glands that produces these hormones, which are necessary for normal bodily functions. The hormones regulate metaboli..