The researchers found that even after the pig died, the pig’s cells and other organ activities were able to remain restored. Can this procedure be used to treat people who have had a heart attack or stroke, or be used to preserve donor organs? This study in pigs has raised…

p-n junction diode is a basic semiconductor device. It is a semiconductor crystal which has an excess of acceptor impurities in one region and donor impurities in the other region. These regions are called p-region and n-region respectively and the boundary between these regions is called p-n junction. The positive…

Generally, after using Electro chemical cells once, they cannot be used again, that is, the chemical reactions that take place in the cell cannot be reversed by passing an electric current. But some such cells are also used now, which can be used again after being used once, such cells…

Claisen condensation :- दो esters के मध्य या एक ester तथा एक ketone के मध्य sodium धातु या C2H5ONa की उपस्थिति में condensation , claisen condensation कहलाता है। CH3CO OC2H5 + H CH2COOC2H5 → CH3COCH2COOC2H5 + C2H5OH Perkins रिएक्शन : किसी aromatic aldehyde पर alifatic acid के निर्जल salt और उसी…

Preparation of Aldehydes By oxidation of alcohol: Oxidation of primary alcohol to aldehyde and secondary alcohol to form ketone. Aldehyde :- R — CH2OH → R — CHO + H2O H.CH2OH (methyl alcohol) → HCHO + H2O CH3.CH2OH (ethyl alcohol) → CH3.CHO + H2O Ketone :- R — CHOH — R’ → R…

Ozone Structure Ozone Structure : Ozone is made from oxygen and only oxygen is obtained when ozone is heated. This proves that it contains only oxygen atoms. Its vapor density is 24 and its molecular weight is 48. On this basis its molecular formula is O3. The following experiments have been done…

In 1919 sommerfeld presented a modified and elaborated version of Bohr’s atomic model. The fine structure of the hydrogen emission lines of the structure is of fine structure. Read more Sommerfeld Atomic Model To explain this, Sommerfeld suggested that it is not necessary that all the electrons of the same…