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Retroviral method: A retrovirus is a virus that carries its genetic material in the form of RNA rather than DNA. In this method retroviruses are used as vectors to transfer genetic material into the host cell, resulting in a chimera, an organism consisting of tissues or parts of diverse genetic constitution. Chimeras are inbred for as many as 20 generations until homozygous (carrying the desired transgene in every cell) transgenic offsprings are born. The method was successfully used in 1974 when a simian virus was inserted into mice embryos, resulting in mice carrying this DNA. In retroviral method, 8-cell stage embryo is removed and infected by virus carrying foreign gene. The retroviral is made defective in such a way that, it can effectively penetrate cells without replication. The transformed embryo is then implanted back in foster mother. After birth, the matings are carried out to establish transgenic line. Although retrovirus is a good choice as a vector, it can carry only a limited size of the foreign DNA.
Chemical Weathering The rocks while getting disintegrated may also undergo chemical change. Water is an important agent in bringing about chemical changes due to dissolution or
Define Changes in Tract Minerals - Nutrition during Stress? Changes in the balance of magnesium, phosphate, zinc and potassium follows alterations in nitrogen balance. Iron and
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Definition of Nursing Process According to WHO (2977) the "nursing process" is a term applied to a system of characteristic nursing interventions in the health of indivi
Beta-blockers have traditionally been considered contraindicated in patients with heart failure because they may block the compensatory actions of the sympathetic nervous system wi
Explain the Occurrence of Nictoinic acid Nictoinic acid occurs widely in the animal and vegetable kingdom in free as well as in bound form (in enzymes). Several animal organs
Explain about Food processing and engineering? Fundamental engineering concepts like momentum, heat and mass-transport systems; engineering aspects of food processing plant ope
Diagnosis History and Physical examination. John's criteria. Echocardiogram show valvular insufficiency. Chest X-ray cardiomegaly if CHF present. EC
The breakdown of ATP releases energy, which is utilized by other reactions that require energy. Identify other examples where inventions have utilized a similar principle, where en
C dna is made from a mature m rna of eukaryotic cell with the utilization of enzyme called as reverse transcriptase. Steps in c dna creation 1. m rna is made and purified f
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