【摘要】 报道了趋磁细菌ＷＤ－１琥珀酸脱氢酶、呼吸抑制剂ＮａＮ３、解偶联剂ＤＮＰ对磁小体合成的影响．琥珀酸脱氢酶活性高，磁小体合成能力强，每个细胞所含磁小体数量多；１ｍｍｏｌＬ－１ＮａＮ３或１ｍｍｏｌＬ－１ＤＮＰ能抑制ＷＤ－１的好氧生长，１０ｍｍｏｌＬ－１ＮａＮ３不抑制ＷＤ－１的微好氧生长，但１ｍｍｏｌＬ－１ＤＮＰ明显地影响微好氧生长，即生长缓慢．ＷＤ－１在微好氧、好氧、好氧与０．０１～０．１０ｍｍｏｌＬ－１ＮａＮ３（或ＤＮＰ）的培养条件下生长时，磁小体合成能力依次下降更多还原

【Abstract】 This paper deals with a study on the gonad development and observation on the sexual cycle of mosquitofish ( Gambusia affinis ) at microscopic and ultramicropic levels with both optical and electron microscopes.Mosquitofish in one of ovoviviparous fishes performing internal fertilixation,and its gonad wsa found out to be possessed of morphological and structrual characters adapted to the reproductive device,such as the long and thin head of spermatozoa,well developed mitochondron membrane round the middle of them ,ultra thin oolemma,rich fat granules and yolk in eggs,etc.Which are much different from those for oviparous fishes.The intense reproductive activity of mosquitofish occurs between May and October each year,and it takes 13～16 days for eggs to be fertilized and hatched till the birth of young.The female are able to copulate with male and to be in gestation again 2～7 days after producing young,and the young reach the sexual maturity duting a period of 45～50 days since their birth.The breeding cycle is 20～30 days.更多还原