排序方式： 共有86条查询结果，搜索用时 370 毫秒
21.
研究一种糖胺聚精分离纯化方法。对用蛋白酶水解法从海湾扇贝中提取的扇贝糖胺聚精粗制品，采用吸附法、透析法、乙醇沉淀法和ＣＴＡＢ（十六烷基三甲溴化铵，Ｃｅｔｙｌｔｒｉｍｅｔｈｙｌａｍｍｏｎｉｕｍｂｒｏｍｉｄｅ）沉淀法分高纯化。结果表明，最终所得主要级分的琼脂糖凝胶电泳和高效液相色谱显示单一区带，指出这一纯化过程是简便、实用、有效的纯化方法。 相似文献
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几种环境因子对墨西哥湾扇贝幼虫和稚贝生长与存活的影响 总被引：19，自引：1，他引：19
叙述了在室内控制条件下海水温度、盐度和pH因子对墨西哥湾扇贝Argopecten irrndians concentricus浮游幼虫和稚贝生长和存活的影响。结果表明，墨西哥湾扇贝浮游幼虫生长的适宜温度为20-30℃，最佳生长温度为25-30℃。稚贝生长的适宜温度为15-33℃，最适生长温度为25-30℃。浮游幼虫生长的适宜盐度为23．38-42．70，最适生长盐度为23．38-36．58；稚贝生长的适宜盐度为23．38-42．70，最适生长盐度为23．38-36．58；在pH为7-8时，稚贝存活率最高，生长最好。稚贝的耐干露能力低下。 相似文献
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Quantitative traits correlative analysis and growth comparison among different populations of bay scallop,Argopecten irradians 总被引：5，自引：0，他引：5
The shell traits and weight traits are measured in cultured populations of bay scallop, Argopecten irradians. The results of regression analysis show that the regression relationships for all the traits are significant (P<0.01). The correlative coefficients between body weight, as well as tissue weight with shell length, shell height and shell width are significant (P<0.05). But the correlative coefficients between the anterior and posterior auricle length with body weight as well as tissue weight are not significant (P>0.05). The multiple regression equation is obtained to estimate live body weight and tissue weight. The above traits except anterior and posterior auricle length are used for the growth and production comparison among three cultured populations, Duncan's new multiple range procedure analysis shows that all the traits in the Lingshuiqiao (LSQ) population are much more significant than those of the other two populations (P<0.01), and there is no significant difference between the Qipanmo ( 相似文献
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利用1998和1999年引进的海湾扇贝(Argopecten irradians irradians)原种F1进行了连续2 a的原种保持实验,包括实验性及生产性两种规模,并用所得原种F3与对照群体进行比较,以探讨在国内进行原种保持的技术措施。2000年,实验性原种制备共培育出M贝(来源于Massachusetts州)原种F2330 kg,V贝(来源于Virginia州)原种F2320 kg,生产性原种制备共培育出原种F255 000 kg。2001年,实验性原种制备共培育出M贝原种F3和V贝原种F3均为280 kg,生产性原种制备共培育出原种F315 000 kg,原种F3的肉柱得率(15.42%)明显高于对照组(13.16%),依然保持了引进群体肉柱得率高的特性,因此在国内进行原种保持是可行的。 相似文献
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湛江北部湾海域养殖墨西哥湾扇贝重量性状增长规律的研究 总被引：2，自引：0，他引：2
采用模型拟合方法研究了湛江北部湾海域养殖墨西哥湾扇贝Argopecten irradians concentricus一个养殖周期的重量增长规律。结果表明,墨西哥湾扇贝各重量性状增长过程遵循Logistic生长模型。通过Levenberg-Mar-quardt迭代法求出模型中3个生长参数,建立了各性状生长方程,并得出各重量性状的生长极限值为体重28.29g、壳重17.27g、生殖腺重0.44g、软体部重11.21g、闭壳肌重5.35g;各重量性状的生长拐点分别为体重5.86个月、壳重6.11个月、生殖腺重5.01个月、软体部重5.55个月、闭壳肌重5.86个月,其中生殖腺重出现增长提早、壳重出现增长延缓现象;各重量性状的绝对增长速度为体重>壳重>软体部重>闭壳肌重>生殖腺重;重量性状相对于形态性状出现生长延缓现象。 相似文献
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基于2×2交叉实验设计,通过杂交和6-DMAP等诱导处理,构建了二倍体自交组、二倍体杂交组、三倍体诱导自交组和三倍体诱导杂交组等四个实验组家系,探讨了海湾扇贝(Argopecten irradians)幼虫期生长及存活的杂种优势和6-DMAP诱导处理效应的复合作用。分别计算各家系的孵化率,测定了各家系幼虫期第1、5、10天幼虫个体的壳长以及第5天和第10天各家系幼虫的存活率。利用一般线性模型(general linear model (GLM))计算表型变量的原因方差组分,评估了杂交和6-DMAP处理对扇贝幼虫生长和存活的影响。结果显示:6-DMAP处理组孵化率要显著低于非处理实验组(P0.05)。三倍体诱导自交组第5天幼虫存活率显著低于其他组(P0.05),到第10天三倍体自交组全部死亡。三倍体诱导杂交组第10天存活率低于二倍体组但不显著(P0.05)。在第1天幼虫生长中,三倍体诱导杂交组幼虫壳长显著小于其他组(P0.05),第5天幼虫生长中,三倍体诱导杂交组壳长则显著大于其他组,而三倍体诱导自交组则显著小于其他组(P0.05)。在第10天幼虫生长中,二倍体自交组显著小于二倍体杂交组和三倍体诱导杂交组组(P0.05)。上述结果显示扇贝幼虫生长期的杂种优势和三倍体诱导效应间存在一定相互作用。 相似文献
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INTRODUCTIONThes0uthembayscallop,AmpeandiansconamtaSay,isanAmpenirradiansInrnaforsouthamsubepedesdistributingalongthecoastSfromNorthCarolinat0Florida,andisanirnPohantshellfishforfisherieSinthesouthrmU.S.A.,butthere-sonisdmingduetoexanivecapture.ThesouthemsubspedeswasfuStintIDdutalinl99lintoChinabytheInstituteofdrinology,ChineSeAcadeInyofSdenas,andshowedwonderfulprospan,althoughthedeveopmentalbiol0gy,espedllytheeffedofboortantenvirDnmentalfactors(forexamPlesandtyorternPeratwonthis… 相似文献
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A bstract In the present study,the effect of one-generation divergent selection on the growth and survival of the bay scallop(Argopecten irradians concentricus)was examined to evaluate the effi cacy of a selection program currently being carried out in Beibu Bay in the South China Sea.A total of 146 adult scallops were randomly selected from the same cultured population of A.i.concentricus,and divided into two groups in shell length(anterior-posterior measurement): large(4.91–6.02 cm,n=74)and small(3.31–4.18 cm,n=72).At the same time,a control group was also randomly sampled(4.21–4.88 cm,n=80).Mass-spawned F 1 progenies from the three size groups were obtained and reared under identical conditions at all growth phases.The effects of two-way(or upward-downward)selection on fertilization rate,hatching rate,survival rate,daily growth in shell length and body weight were assessed in the three size groups.Results show that signifi cant differences(P0.01)were found in hatching rate,survival rate and daily growth of F 1 progenies,but not in fertilization rate(P0.05),among the three groups.The hatching rate,survival rate and daily growth of the progeny of large-sized parents were greater than those of the control group(P0.05),which in turn were larger than those of small-sized group(P0.05).Responses to selection by shell length and body weight were 0.32±0.04 cm and 2.18±0.05 g,respectively,for the upward selection,and-0.14±0.03 cm and-2.77±0.06 g,respectively,for the downward selection.The realized heritability estimates of shell length and body weight were 0.38±0.06 cm and 0.22±0.07 g for the upward selection,and 0.24±0.06 cm and 0.37±0.09 g for the downward selection,respectively.The change in growth by bidirectional selection suggests that high genetic variation may be present in the cultured bay scallop population in China. 相似文献
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为研究抚宁海湾扇贝养殖区浮游植物变化特征,探讨水质因子对浮游植物的影响,2020年5月—11月,每月测定该海域的主要水质因子,统计浮游植物。结果表明:共鉴定浮游植物69种,优势种33种;浮游植物密度(8.3~267.9)×104cell/L,5月份最高;生物多样性指数为0.458~3.747,均匀度指数0.099~0.796,丰富度指数0.933~4.755。海水水温范围11.8~26.8℃,盐度28.8~34.0,活性硅酸盐(SiO32–-Si)含量0.025~0.627mg/L,硝酸盐氮(NO3–-N)浓度0.057~0.284mg/L,均呈“上升-下降”趋势;pH范围为7.867~8.190,化学需氧量(COD)为0.260~1.415mg/L,活性磷酸盐(PO43–-P)0.003~0.006mg/L,变化趋势为“下降—上升”;对优势种与水质因子的分析表明,影响该海域浮游植物变化的主要环境因子为活性硅酸盐、盐度、活性磷酸盐和硝酸盐氮;裸藻门与活性磷酸盐、盐度呈正相关,与活性硅酸盐、硝酸盐氮呈负相关;甲藻门与活性硅酸盐呈正相关,与活性磷酸盐、硝酸盐氮呈负相关;隐藻门与活性硅酸盐、盐度成正相关,与硝酸盐氮呈负相关。 相似文献