化学镀铜中Cu（Ⅱ）—EDTA电还原机理

The mechanism of electrochemical reduction for species Cu(I)-EDTA in eiectroless copper plating was studied by means of polarization curve,rotating disc electrode,chrono-potentiometry and chronocoulometry.The result of reaction order determination indicat     

中国叶刺瘿螨亚科三新种记述(真螨目:瘿螨科)

文内记递的三个新种是柿畸瘿螨Abacorns diospyris,珍珠梅叶刺瘿螨phyllocoptes sorbariae和长毛刺皮瘿螨Aculops,longispinosus。它们的寄主植物分别是柿、珍珠梅和槭,均采自湖北神农架自然保护区。     

栉孔扇贝（Chlamys farreri）在模拟自然水环境中滤水率的测定

在模拟自然海区的生态环境的条件下，对桑沟湾内主要养殖种类栉孔扇贝的滤水率进行了测定，对其不同体长扇贝的滤水率进行了实验比较。在水温２４－２６℃。盐度３１－３２‰范围内，昼间光照５００Ｌｕｘ左右条件下，用叶绿素和颗粒有机物作为测定指标，结果表明，此种扇贝的滤水率随个体增大，单位个体的滤水率越大，而单位干组织重的滤水率越小；同一规格扇贝，密度越大，滤水率越低。在本实验过程中，昼夜间的滤水率变化不甚明显     

Effect of dietary lysine on growth,intestinal enzymes activities and antioxidant status of sub-adult grass carp (Ctenopharyngodon idella)

The dietary lysine requirement of sub-adult grass carp (460 ± 1.5 g) was assessed by feeding diets supplemented with grade levels of lysine (6.6, 8.5, 10.8, 12.9, 15.0 and 16.7 g kg^?1 diet) for 56 days. The test diets (28 % CP) contained fish meal, casein and gelatin as sources of intact protein, supplemented with crystalline amino acids. Weight gain (WG), feed intake and feed efficiency were significantly improved with increasing levels of lysine up to 12.9 g kg^?1 diet and thereafter declined (P < 0.05). Quadratic regression analysis of WG at 95 % maximum response indicated lysine requirement was 10.9 g kg^?1 diet. Activities of trypsin, chymotrypsin, lipase, Na⁺, K⁺-ATPase and alkaline phosphatase in intestine, creatine kinase activity in proximal and mid-intestine responded similar to WG (P < 0.05). In addition, lipid and protein oxidation decreased with increasing levels of lysine up to certain values and increased thereafter (P < 0.05); the anti-hydroxyl radical capacity, dismutase, catalase, glutathione peroxidase, glutathione reductase, glutathione-S-transferase (GST) activities and glutathione content were increased with increasing dietary lysine levels up to certain values in the detected tissues, except for hepatopancreatic GST. Requirement estimated on the basis of malondialdehyde content in intestine and hepatopancreas was 10.6 and 9.53 g lysine kg^?1 diet, respectively.     

增产素在亚心形扁藻生产上的应用

亚心形扁藻是鱼、虾、贝幼体最为常用的活饵料。如何提高它的产量和质量问题,正引起各方面的关注。水稻生产中应用增产灵,使稻谷每公顷增产4.46％;海带、紫菜的生产中,应用外源激素,产量提高了3～5倍。一些研究还表明,激素在不同的环境条件下,对不同部分和不同年龄的植物体所起的生理作用不同,其生长结果也不一样。我们在已有工作的基础上,进行了增产素处理亚心形扁藻的生产性试验、不同培养因素试验及生理效应、产品质量分析和投喂海水动物的试验,现报导如下。     

野生和养殖牡蛎种群的比较摄食生理研究

１９９５年４～５月在山东省荣成市桑沟湾用模拟现场流水法对该湾野生和养殖太平洋牡垢种群不同大小个体的摄食生理进行了比较研究。实验结果表明，野生和养殖太平洋牡蛎种群在滤水率、选择率和吸收率等方面无明显的差异，但在保留率和摄食率等方面有明显的差异。这说明野生种群能比养殖种群更好地过滤下并摄入海水中的颗粒物。根据实验数据，用计算机模拟得出了野生和养殖牡蛎种群的滤水率与个体体重的关系为：ＦＲω＝２．８８２３Ｗ０．３６４７，Ｒ２＝０．９４２２和ＦＲｃ＝４．０１４４Ｗ０．２６９１，Ｒ２＝０．９０２９。     

通江湖泊石臼湖鱼类群落结构现状及其季节变化

石臼湖是长江下游唯一的自然通江湖泊,为掌握其鱼类资源状况,本研究于2017年1月至2018年3月采用多目刺网和定制串联笼壶采集石臼湖渔获物,分析了石臼湖鱼类群落结构及其季节变化.结果显示,共采集到鱼类36种,隶属于6目7科28属,其中鲤科鱼类最多,占总物种数的69.44％;鱼类物种组成以定居性、杂食性、中上层鱼类为主,...     

Optimal dietary alpha‐linolenic acid/linoleic acid ratio improved digestive and absorptive capacities and target of rapamycin gene expression of juvenile grass carp (Ctenopharyngodon idellus)

Growth performance, digestive and absorptive capacities and target of rapamycin (TOR), ribosomal protein S6 kinase 1 (S6K1) and eIF4E‐binding protein (4E‐BP) gene expression in the hepatopancreas and intestine of juvenile grass carp (Ctenopharyngodon idellus) fed graded ratios of dietary alpha‐linolenic acid/linoleic acid (ALA/LNA) (0.01, 0.34, 0.68, 1.03, 1.41, 1.76 and 2.15) for 60 days were investigated. The results showed that ALA/LNA ratio of 1.03 significantly improved (i) per cent weight gain (PWG) and feed efficiency, (ii) hepatopancreatic trypsin, chymotrypsin, lipase, amylase and intestinal creatine kinase (CK) activities, (iii) hepatopancreatic trypsinogen‐2 and chymotrypsinogen mRNA levels. Meanwhile, fish fed with ALA/LNA ratio of 0.68 significantly enhanced, (iv) Na⁺/K⁺‐ATPase and γ‐glutamyl transpeptidase activities in whole intestine, and alkaline phosphatase activities in the proximal intestine (PI) and distal intestine, (v) amylase, intestinal Na⁺/K⁺‐ATPase alpha‐subunit isoform 1, Na⁺/K⁺‐ATPase alpha‐subunit isoform 8 and CK mRNA abundances, (vi) TOR and S6K1 gene expression in the hepatopancreas and intestine of juvenile grass carp. Based on the quadratic regression analysis of PWG, cholecystokinin and leptin contents in the PI, optimal dietary ALA/LNA ratio of juvenile grass carp (8.78–72.00 g) was estimated to be 1.08, 1.19 and 1.05, respectively.