diagram of sulphur cycle

Sulphur Cycle - Sulphur is an important component of most proteins, few vitamins and enzymes. Though sulphur occurs in gaseous form, as hydrogen sulphide (H 2 S) and sulphur dioxide (SO 2 ), the residence time of sulphur in atmosphere is v..

Sulphur is an important component of most proteins, few vitamins and enzyme..

Earth is the source of matter for all living organisms, as they require several (about 40) elements for their growth and life processes. Some elements and their compounds have an important role in the living protoplasm and are required in large amounts. These nutrients are called 'macro nutrients' ..

Types of Biogeochemical Cycles - Biogeochemical cycles are basically of two types: a) Gaseous cycles like carbon (as carbon dioxide), oxygen, nitrogen, etc. b) Sedimentary cycles like sulphur, phosphorus, etc. In gaseous cycles, the elemen..

Heart - Cardiac Cycle - The heart has an increasing rhythmic activity. It pumps blood by its contraction and relaxation. The contraction of the heart is called systole and the relaxation is called diastole . The contraction and relaxation together constitute the heart beat. The heart beat..

1) Decomposers like Aspergillus (aerobic fungi), Neurospora (aerobic fungi) and Escherichia (anaerobic bacteria) act on the dead and decaying organic matter of plants and animals, releasing hydrogen sulphide (H 2 S) to the environment. 2) Heterotrophic bacteria like Desulfavibrio and Acetobacter r..

Summary - The biotic and abiotic components form an interacting system called 'ecosystem'. Producers, consumers and decomposers are the various trophic levels, which are linked by their food relationship forming a 'food chain'. Several food chains are interrelated and interconnected to form a netwo..

is carried out on the surface of platinum catalyst. The reason why a catalyst increases the rate of a reaction is that it lowers the activation energy of the reaction by altering the mechanism of the reaction. This is illustrated with the example of oxidation of sulphur dioxide (SO 2 ) in..

Laboratory Preparation of Oxygen - Any of the above mentioned methods could be used to prepare oxygen in the laboratory. Mercuric and silver oxides are not used for the preparation of oxygen, as they are very expensive. For the laboratory preparation of oxygen from any of the compounds like lead di..

. They are named as PQRST. The P Wave represents the first upward deflection of the ECG. It takes place when the impulse spreads over the atrial chambers. Its average duration is about 0.1 second. It represents the depolarization of the atrial musculature. The QRS complex is the combined result of ..