gastrulation organ formation pregnancy and some issue related in reproduvtive

All the events which change a zygote into a fully developed organism is called embryonic development. The entire process of development is called embryogenesis. Von Bear is called the "Father of Modern Embryology". Embryonic Development includes a definite series of fundamentally similar ..

Nitriles need relatively stronger reagents for reduction. Nitriles undergo reduction to form primary amines as the products. This type of reduction can be carried out using reducing agents like H 2 in the presence of catalysts like Pt, Ni etc., Na in C 2 H 5 OH or LiALH 4 . ..

. The first half of the phase and the changes in these phases are controlled by estrogens and progesterone. The secretion of these hormones occur cyclically because of the cyclic secretions of pituitary gonadotropins in the female. The fertilised ovum in mammals and other higher animals passes thro..

i) Vapour phase nitration of alkanes - Hydrocarbons when heated with forming nitric acid at 693 - 793 K, are converted to nitro alkenes. Nitration of methane end lower members can be carried out by this nitration techniqu..

. However, it is also seen in lower organisms like the bacteria, Spirogyra (an alga) and Paramoecium (a protozoan). Bacteria show a primitive type of sexual reproduction called genetic recombination. Sexual reproduction involves the fusion of male gamete with the female gamete in a proces..

The idea of writing a notice is to draw attention to something or some event that would take place. All the required information must be given in a simple, concise, attractive manner so that people notice it. A notice conveys information in a comprehensive manner. It is usually an advance informat..

Alkyl halides, on treating with ethanolic solution of silver cyanide, give alkyl isocyanides as the major products. Ag + facilitates the removal of halide ion. The minor product during this reaction is alkyl cyanide. It may be noted here that when treated with ethanolic solution of KCN, the m..

Summary - The modern classification is an extension of the system of classification proposed by Carolus Linnaeus. The present system of classification involves a series of graded taxonomic ranks called taxa which include phylum and family in addition to the four taxa introduced by Linnaeus. The hie..

Ammonolysis is Alkyl halides - An alkyl halides or a benzyl halide reacts with ammonia to form primary secondary and tertiary amines. If ammonia is used in excess primary amine is the major product. Under these conditions in the reaction mixture, an alkyl halide is more likely to encounter and reac..

>Any change in the expression of a gene follows an interaction between nucleus, cytoplasm and environment. Cancer is a differentiation related disease. In cancer, the cells continue to divide due to lack of the property of contact inhibition. Cancer is caused by activation of genes called..