柠檬酸、Nisin-檬酸联合对三种常见水产病原菌的作用

选用嗜水气单胞菌、副溶血弧菌、荧光假单胞菌三种常见水产病原菌，用于测定柠檬酸的抑菌效果及最小抑菌浓度，并研究了柠檬酸抑菌作用的稳定性。三种菌均为革兰氏阴性菌。试验结果表明，柠檬酸对三种菌都有不同程度的抑菌作用，并得到最小抑菌浓度，依次是：0．0011g／mL，0．0008g／mL，0．00125g／mL；在最小浓度下抑菌作用可达6d之久，柠檬酸抑菌效果有一定的稳定性。将Nisin溶于0．00125g／mL，得到复合液的抑菌效果强于柠檬裴单独作用，且稳定性增强。     

乳山湾东流区细菌数量的分布及与环境因子关系的研究

根据1995年6～9月对乳山湾东流区的微生物调查资料，研究了乳山湾东流区海水及底泥中细菌和弧菌量的变化及其与环境因子的关系。结果表明，该海域海水中细菌和弧菌的数量变化与温度的变化相一致，6月中旬～8月中旬，细菌数量增长比较缓慢，8月中旬开始，细菌数量增长较快，到8月底，达到最高值，异养菌为5．71×106cell／mL，弧菌为2．1×104cell／mL。而后，随着温度的下降，水中的细菌量逐渐减少。滩涂底泥中，细菌和弧菌的数量均比海水中细菌高l～2个数量级。     

基于遥感技术的森林可燃物类型划分

应用监督分类法中的最大似然法(Maximum Likelihood Classification)以及遥感图像对塔河林业局森林可燃物类型划分的结果为:针叶林、阔叶林、针阔混交林、空地等几种类型,并绘制了可燃物类型分布图,经分类精度检验,总体分类精度为83.00%,KAPPA系数为0.769。同时,对不同可燃物类型的特点进行了分析。     

陕西小秦岭岩浆岩地球物理特征

根据不同类型岩浆岩的岩石密度、磁性的不同,通过应用RGIS软件和Surfer软件对重磁异常分离、延拓、求导及重、磁特征信息的复合处理等,研究了小秦岭岩浆岩地球物理特征,结果表明：重磁反映岩浆岩带所处的构造单元部位、岩浆系列特征以及与矿带的时空关系,由此可将小秦岭划分为4段不同的岩性岩浆岩。     

Carbon dynamics and stability between native Masson pine and exotic slash pine plantations in subtropical China

Afforestation and ecological restoration have often been carried out with fast-growing exotic tree species because of their high apparent growth and yield. Moreover, fast-growing forest plantations have become an important component of mitigation measures to offset greenhouse gas emissions. However, information on the long-term performance of exotic and fast-growing species is often lacking especially with respect to their vulnerability to disturbance compared to native species. We compared carbon (C) storage and C accumulation rates in vegetation (above- and belowground) and soil in 21-year-old exotic slash pine (Pinus elliottii Engelm.) and native Masson pine (Pinus massoniana Lamb.) plantations, as well as their responses to a severe ice storm in 2008. Our results showed that mean C storage was 116.77 ± 7.49 t C ha^?1 in slash pine plantation and 117.89 ± 8.27 t C ha^?1 in Masson pine plantation. The aboveground C increased at a rate of 2.18 t C ha^?1 year^?1 in Masson pine and 2.23 t C ha^?1 year^?1 in slash pine plantation, and there was no significant difference in C storage accumulation between the two plantation types. However, we observed significant differences in ice storm damage with nearly 7.5 % of aboveground biomass loss in slash pine plantation compared with only 0.3 % loss in Masson pine plantation. Our findings indicated that the native pine species was more resistant to ice storm because of their adaptive biological traits (tree shape, crown structure, and leaf surface area). Overall, the native pine species might be a safer choice for both afforestation and ecological restoration in our study region.     

野生胶红酵母糖苷酶水解媚丽新酒中香气糖苷研究

实验分离提取杨凌媚丽葡萄新酒中的香气糖苷,添加优选野生胶红酵母的糖苷酶液,进行催化水解实验,萃取水解生成的品种香气成分,进行GC-MS检测分析。以杏仁β-糖苷酶、黑曲霉果胶酶、La Fort商业果胶酶作催化比较实验。结果表明,杏仁β-糖苷酶标准品催化水解生成的游离香气成分种类和含量最多,其次是野生胶红酵母酶液和黑曲霉果胶酶。酶促水解生成的游离成分中,萜烯类和去甲类异戊二烯化合物能够赋予葡萄酒果香和花香,微量的酚酸酯可增加香气的复杂性,而含量很高的脂肪族类化合物和挥发性酚类会带给葡萄酒不良气味。因此,具有中等催化水解香气糖苷能力的野生胶红酵母的糖苷酶具有良好的增香酿造应用潜力。     

哈密产黄鳝的染色体组型分析

哈密产黄鳝的染色体组型分析王秀玲，吴敏，马英梅，刘伟，史为慧（新疆师范大学生物系，乌鲁木齐，８３００５３）关键词哈密产黄鳝，核型，分类ＡＮＡＬＹＳＩＳＯＦＫＡＲＹＯＴＹＰＥＯＦＭＯＮＯＰＴＥＲＵＳＡＬＢＵＳＩＮＨＡＭＩ￥ＷａｎｇＸｏｕｌｉｎｇ；ＷｕＭ...     

乳山湾东流区营养状况时,空变化及其评价

有机污染在时间上的变化为，7月前呈有机污染不断加剧的过程，到7月整个东流区均达到严重污染水平；7月后是污染程度逐渐减轻的过程，到9月整个东流区水质恢复到较好水平。有机污染程度在空间上的变化是从湾外向湾内逐渐加剧趋势。6、7和8月整个东流区均达到富营养化水平，但富营养化的程度有所不同，7月富营养化程度最严重，8月较7月减轻，到9月湾内基本恢复正常。与1994年8月比较，1995年8月东流区有机污染和富营养化程度有所加剧。     

Heritability of juvenile growth traits in red drum (Sciaenops ocellatus L.)

Heritability of juvenile growth rate was estimated for red drum (Sciaenops ocellatus), an economically important sciaenid fish in the southern USA. Thirty‐eight families were generated via ‘natural’ spawning of multiple sets of five breeders (three dams × two sires) in individual brood tanks. Offspring were individually tagged with Passive Integrated Transponder (PIT) tags and mixed for grow‐out in replicate ‘common‐garden’ tanks. Juvenile growth was followed from 166.4±18.6 to 254.0±27.0 mm (total length). Offspring were assigned a posteriori to individual brood fish (dam and sire) based on genotypes at nuclear‐encoded microsatellites. Heritability (h²) of a thermal growth coefficient was estimated using an animal‐additive model and a restricted maximum‐likelihood algorithm. Estimates of h² were 0.33±0.08 and 0.31±0.08 for thermal growth coefficient based on length and weight respectively. These results indicate a significant genetic component in juvenile growth rate in red drum. Estimates of h² for condition coefficient (K) at various measurement dates averaged 0.38, suggesting a genetic component to shape in juvenile red drum.     

秋冬季黄东海区影响鳀鱼行动分布的三大水系变化特征

依据中国和挪威联合进行的黄东海渔业资源声学评估调查资料，并结合历史研究成果，分析了对鱼行动分布有着显著影响的三大水系（黄海冷水团、黄海暖流和苏北沿岸冷水）的变化特征。结果表明，三大水系均具有明显的年际变化。（1）黄海冷水团的温盐性质比较稳定，但其相对体积强年（1986年11月）约为弱年（985年11月）的144倍；（2）黄海暖流的流速强年（1986年1月）约为弱年（1992年正月）的1．21倍；（3）苏北沿岸冷水以3月份势力最强，其强度1985年1月大于1986年1月。