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K. Ura S. Mizuno T. Okubo Y. Chida N. Misaka S. Adachi K. Yamauchi 《Fish physiology and biochemistry》1997,17(1-6):397-403
Changes in immunoreactivity of Na+/K+-ATPase -subunit in gill sections of wild masu salmon (Oncorhynchus masou) during the parr-smolt transformation (smoltification) were compared with changes in gill Na+/K+-ATPase specific activity. Gill Na+/K+-ATPase specific activity increased from April and peaked in May. Immunohistochemical analysis, using an antiserum against a synthetic oligopeptide based on the conserved region of the Na+/K+-ATPase -subunit, revealed that immunoreactivity was confined to chloride cells in the surface layer of primary lamellae and the proximal end of secondary lamellae. The size and number of these cells increased gradually from February to May; however, the number of chloride cells of the secondary lamellae decreased in May. These data suggest that the synthesis of Na+/K+-ATPase and the proliferation of chloride cells occur prior to the elevation of enzyme activity. Moreover, it is likely the proliferation and hypertrophy of chloride cells on primary lamellae prepare smolts for entry into seawater and migration in the ocean. 相似文献
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广温型杏鲍菇Pe528菌株的选育 总被引:1,自引:0,他引:1
杏鲍菇属中低温型品种 ,从 1998年开展杏鲍菇的定向系统选育 ,选择目标是抗高温、耐低温、质量好、产量高 ,既可作冰菇 ,又可作菜菇棍棒状品种。 1999年选育的优良菌株 ,具有生育期短 ;较抗热耐低温 ,子实体清脆 ,形美、爽口等优点。采用棉子壳或木屑等栽培转化率达 10 0 %以上 ,并定名为“Pe5 2 8” 相似文献
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水稻黄叶生理病与硅肥施用效果 总被引:2,自引:0,他引:2
新垦红壤植稻后发生的黄叶生理病与铁毒缺硅有关。施用硅肥能提高土壤有效硅含量,并提高土壤水溶性及活性Si/Fe值,抑制黄叶生理病症,改善水稻生长状况,提高水稻产量。电子探针分析根内元素表明:施用硅肥可减少铁在根表皮层的积累,增加根内皮层硅钙的含量。 相似文献
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对黄金鲈♀×伊犁鲈♂杂交后代的形态特征与黄金鲈和伊犁鲈进行了比较,并就其人工养殖技术进行了探讨。结果表明:2龄杂交鲈体长26.5~31.5cm,(L=28.53±1.69cm),体重339.0~650.5g,(=447.31±94.23g)。体长为体高的3.58~3.93倍,两背鳍分离,第一背鳍棘14~16根,体侧扁,长椭圆形,形态特征与黄金鲈相似,体背为灰绿色,颜色介于黄金鲈与伊犁鲈之间,身体两侧有5~9条黑色横斑,属于温、冷水性鱼类,生长的最适温度为22~25℃,室内养殖条件下,投喂颗粒饵料,并辅以动物性饵料,生长迅速,日均增重率可达0.62g/d。 相似文献
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利用桑枝屑、棉籽壳为主料,辅料中的玉米粉、麸皮、米糠作为3个因素,划定8%,10%两个水平,按L8(27)设计3因素2水平正交试验,糖1%、石灰1%,共设计出8种培养基配方进行试验.通过3种氛源不同配比组合的培养基对杏鲍菇528生长影响的比较,筛选出最适合栽培的培养基配方.试验结果表明,配方6(桑枝屑60%、棉籽壳10%、玉米粉10%、麸皮8%、米糠10%、石灰1%、糖1%)为最佳的培养基配方. 相似文献
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