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The effect of irradiance (neutron, alpha, X- and visible electromagnetic rays) on biological systems (survivals of organs, tissue cultures, breakage of DNA) has been widely studied in radiology. The biological effect of radiation depends on the dose (D = I · t; I and t are the intensity and time of irradiance, respectively). In photosynthesis light is a substrate for the photoelectronic conversion...
We have identified the existence of two genes, trnQ and aroA, located upstream of the psbO gene in Synechocystis sp. PCC 6803. The trnQ gene encodes a glutamine-specific transfer RNA (tRNA Gln ) and the sequence given is the first reported for any cyanobacterium. The gene seems to exist as a single copy since its deletion results in nonviable mutation. The aroA gene encodes for 5-enolpyruvylshikimate...
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