农药杀螟硫磷酶促降解的研究

从长期受农药杀螟硫磷污染的土壤中分离到一株高效降解菌株,研究了其最适产酶条件:培养温度为30℃,培养液起始pH为7.0,培养时间为30 h.从该降解菌中提取的粗酶液在pH 7.5和30℃时显示最大的降解活性,其米氏常数Km为2.92×10-4mol/L,最大降解速率为2 422.79 nmolm in-1mg-1.图7参15     

关于肥满度指数的讨论

肥满度指数,也称身体状况指数,广泛应用于各个动物类群和生态学、生理、生化、遗传学以及养殖业.至今已有多种肥满度指数提出,从计算公式结构上,肥满度指数可以划分为比值法和残差法两大类.通过对各种肥满度指数的分析,Le Cren相对状态指数Kn、log10(体重)与log10(身体大小指数)线性回归的(标准化)残差这两种肥满度指数系统误差相对较小.实际应用中最好根据所考察的问题分别计算不同年龄段、性别的个体的肥满度指数来分析肥满度指数.由于定义的模糊性及其前提假设缺乏广泛验证,因此,肥满度指数在实际应用中需要谨慎考察其前提假设是否满足.参33     

Prelaying maternal condition modifies the association between egg mass and T cell-mediated immunity in kestrels

Theoretical models of parental care predict differential allocation in relation to the expected fitness of the offspring. As birds must allocate all the resources required for embryonic development in self-contained packages, maternal egg allocation takes a central role in avian life histories. It is predicted that mothers can influence offspring performance by varying the size or composition of their eggs. In this context, T cell-mediated immune response has been revealed as a valuable tool to evaluate fledgling fitness. However, little is known about its relationships to egg mass. I describe a negative association between egg mass and cellular immune response in Eurasian kestrel nestlings (Falco tinnunculus) throughout 3 years. To explore how environmental conditions could mediate this relationship, I experimentally supplied food to females before egg formation in the third study year. I found that this relationship turned to positive in food-supplied females without any effect on egg size. This result shows that environmental conditions before egg formation mediate the relationship between egg mass and future immune response of the nestlings. I suggest that females may be constrained in improving the future immune response of their offspring due to resource allocation trade-offs determined by their pre-laying condition.     

导游人力资源的现状分析与对策

随着导游职业的社会化，导游数量急剧上升，但导游质量却是年年下降，本文就目前我国导游人力资源的学历、等级等现状为主，分析其现状和所存在的问题，并提出相应的对策与建议。     

米曲霉产氨基酰化酶条件及部分酶学性质研究

通过单因子和多因子摇瓶正交优化试验,确定了米曲霉液态发酵产氨基酰化酶的最佳发酵条件.优化发酵培养基组成(ρ/gL-1):葡萄糖40,蔗糖10,可溶性淀粉20,蛋白胨2.5,马铃薯液1000mL,pH自然.培养基装量50mL/250mL三角瓶,接种量4%.培养温度30℃,转速100r/min,发酵时间42h.每50mL培养物的总酶活由优化前的2627u提高到7338u,是优化前的2.79倍.研究了米曲霉氨基酰化酶的部分酶学性质.该酶催化反应的最适pH为7.0,最适温度为40℃,低浓度的Co2 (5×10-4mol/L)对酶活激活作用显著.图5表2参8     

淮南矿区井下煤炭自燃火灾因素分析及防治措施

１９９０年以来,淮南矿区１１个矿井共发生自燃火灾４９起,自燃发火率平均为每百万吨习煤量０．５３次。通过对该矿区井下煤炭自燃因素和地质条件及开采中出现的自燃发火原因作了具体分析,从中找出发火规律;并对井下煤层自燃发火采取均压通风和直接灭火做了新的尝试,提出了对井下煤炭自燃防治措施。     

阿尔山市TSP(总悬浮微粒)浓度变化与气象因素关系探讨

通过阿尔山市2005年大气中总悬浮微粒（TSP）的全年三个监测点的监测结果，结合采样时有关气象参数，着重对TSP与气象条件的关系做一下分析、研讨。     

胞外聚合物合成与应用研究概况

介绍了胞外聚合物絮凝剂研究与发展概况;讨论胞外聚合物絮凝剂的结构、性能及作用机理;重点介绍了胞外聚合物絮凝剂产出、絮凝条件以及应用的研究;胞外聚合物絮凝剂研究的发展趋势。     

Experimental and numerical study of the dispersion of motor vehicle pollutants under idle condition

The aim of the work presented here is to study experimentally and numerically the dispersion characteristics of vehicular exhaust plume at an idle condition in an idealized and simplified environment. The gaseous and particulate concentrations in the exhaust plume of three idling motor vehicles were measured in an isolated environment under calm weather conditions. Despite the difference in the initial concentrations, the pollutants decayed exponentially in all directions.The CFD code PHOENICS 3.3, with the k–ε eddy dissipation sub-model, was used for the numerical simulation. The simulated results match very well with the experimental results close to the source of emission but decay to the ambient concentrations much slower. The effects of the initial emission concentration, exit velocity, exit direction and crosswind intensity have been investigated parametrically. The initial pollutant concentration will increase the local concentrations but the pattern of dispersion remains the same. The exit velocity will increase the momentum of the jet, resulting in a deeper penetration downstream. The exit angle has a stronger influence on pollutant dispersion than both initial pollutant concentration and exit velocity. When the exit angle is 15°, the pollutants tend to spread on the ground region. Crosswind shows a significant effect on the dispersion of the exhaust plume also. It will divert the plume to disperse in the same direction of the wind with limited penetration in the downstream direction.