support group dynamics

Daniel Rutherford, a Scottish Physician, discovered nitrogen in 1772. But it was Lavoisier, who proved that nitrogen is an element and that it was not a supporter of combustion and respiration. He called it 'azote' meaning 'no life'. The name 'Nitrogen' was given to it by Jean Antoi..

Summary - Chlorine belongs to group VII A. Members of this group are called halogens which means 'salt producers'. Chlorine is a greenish yellow gas. Chlorine has seven electrons in its outer most shell and so has a valency of 1. Like other halogens chlorine is a strong oxidisin..

Summary - Oxygen and sulphur belong to group VI A. Oxygen shows a valency of -2, while sulphur shows a valency of -2, +4 and +6. Industrially oxygen is manufactured by fractional distillation of liquid air free of dust particles and CO 2 . Oxides of mercury, silver and lead decompose to g..

Among the members of the animal kingdom, about 95% do not posses a backbone (or vertebral column) and hence are described as invertebrates. The remaining animals represent a group called chordates, which posses a solid supporting structure on the dorsal side of the body called n..

Earth is the only planet on which life exists. It consists of three components Lithosphere (Land), Hydrosphere (Water) and Atmosphere (Air). Life originated and evolved because of this unique combination of the three components and was ideal and favourable for life. The life supporting..

Individuals living in the same area are referred as local populations. They all experience similar ecological processess at a particular stage of the life cycle. Similar populations of a species occupying different geographical areas are called sister populations. Population is a dynamic ..

>Most artificial resources created by man draw support directly and indirectly from one or more natural resources. With this, human society is developing with man - made resources on one hand and natural resources on the other. Science and technology link them for human development. Man m..

The Kingdom Metazoa includes all multicellular animals. The unicellular animals have been placed in the phylum protozoa which is now a part of the kingdom protista . Thus, all the remaining animals from sponges to mammals are now placed in the Kingdom Metazoa. Of the nearly million identified speci..

The esterification of carboxylic acids with alcohols is a kind of nucleophilic acyl substitution. The first step is the protonation of the carbonyl oxygen, which activates the carbonyl group towards nucleophilic addition of the alcohol. The tetrahedral intermediate, which is formed tra..

. After fertilisation, the fertilised ovum trickles down into the uterus for implantation. Cleavage is the process which transforms the fertilised ovum into a sphere of closely aggregated cells. The fertilised ovum divides repeatedly in close succession to form blastomeres. Cleavage divisions do no..