Mitosis and Meiosis

Mitosis and Meiosis When a eucaryotic microorganism reproduces asexually, its genetic material must be duplicated and then separated so that each new nucleus possesses a complete set of chromosomes. This process of nuclear division and chromosome distribution in eucaryotic cells is called mitosis. Mitosis actually occupies only a small portion of a microorganism’s life as …

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(A) Anton deBary. (B) Louis Pasteur. (C) Robert Koch.

Koch’s postulates

Koch’s postulates Robert Koch (1843–1910) was a medical doctor and a bacteriologist. He was the first to show, in 1876, that anthrax, a disease of sheep and other animals, including humans, was caused by a bacterium that he called Bacillus anthracis. He subsequently discovered, in 1882, that tuberculosis and, in 1883, that cholera are each …

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Theophrastus, the father of botany

Plant diseases as the wrath of gods by theophrastus

Plant diseases as the wrath of gods by Theophrastus Theophrastus, the “father of botany.” The climate and soil of countries around the eastern Mediterranean Sea, from where many of the first records of antiquity came to us, allow the growth and cultivation of many plants. The most important crop plants for the survival of people …

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Biosafety guidelines and regulations for GMOs, GLP and GMP

Biosafety guidelines and regulations for GMOs, GLP and GMP

Biosafety guidelines and regulations for GMOs, GLP and GMP Introduction “BIOSAFETY” refers to the efforts that ensure safety in using, transporting, transferring, handling, releasing and disposing of biological organism including genetically modified organism which are capable of harming human, animals, plants or environment. It also refers to the policies and procedures adapted to ensure the …

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Tobacco Mosaic Virus

The Contribution of Tobacco Mosaic Virus to Biology and Medicine

The Contribution of Tobacco Mosaic Virus to Biology and Medicine Tobacco mosaic virus has contributed greatly to our understanding of not only the plant viruses and their effects in plants, but also of the viruses of humans and animals and, furthermore, of the structure and function of the genetic code in all organisms. Some of …

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Phytoalexins

Phytoalexins

Phytoalexins Phytoalexins are toxic antimicrobial substances produced in plants only after stimulation by various types of phytopathogenic microorganisms or by chemical and mechanical injury. Phytoalexins are produced by healthy cells adjacent to localized damaged and necrotic cells in response to materials diffusing from the damaged cells. Phytoalexins are not produced during compatible biotrophic infections. Phytoalexins …

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