矿物类型对硅酸盐细菌解钾作用的影响

对两种硅酸盐细菌菌株K110、K195分别与石骨子、碳渣、绿豆岩、正长石4种底物的解钾作用进行了研究。结果表明:各处理的解钾量在前8 d均随培养时间的增加而增加,不同底物间解钾率差异极显著(P<0.01);硅酸盐细菌对正长石的解钾率最低为0.32%,对绿豆岩的解钾率为0.53%,对碳渣的解钾率为1.02%,对石骨子的解钾率最高为1.04%;菌株K110、K195间的解钾能力差异极显著(P<0.01)。     

温度对生物活性炭处理效果影响的试验研究

针对高温、常温以及低温的微污染水源,采用生物活性炭技术进行现场试验研究.结果表明,生物活性炭工艺在各个水质时期（高温、常温、低温）对水中的有机物的去除率分别为CODMn（51.66%、47.74%、24.15%）、UV254（60.6%、49.99%、17.86%）、TOC（55.17%、24.14%、22.86%）.比较而言高温较常温及低温期生物活性炭能够达到更好的效果.同时,生物活性炭工艺细菌在投氯量低的条件下即可被杀灭,没有增加后续工艺消毒剂用量,保证了饮用水的安全性.     

Dynamics of total culturable bacteria and its relationship with methylmercury in the soils of the water level fluctuation zone of the Three Gorges Reservoir

Field investigations were conducted to study the temporal and spatial distribution characteristics of total culturable bacteria(TCB)and its relationship with methylmercury(MeHg)in the soils of the water level fluctuation zone of the Three Gorges Reservoir.Different altitudes(170–180,170–175,165–170 and 160–165 m)in Zhenxi(Site 1),Shibaozhai(Site 2)and Tujing(Site 3),Chongqing,China were chosen as sampling sites.Results indicated that TCB did not have significant difference in the top(0–10 cm)and sub(10–20 cm)soil of the non-inundated area(175–180 m),but showing a significant difference in the water level fluctuation zone(\175 m,suggesting that water level fluctuation had an important effect on TCB.Moreover,TCB in soils of various altitudes of Site 1 and 2had significant difference,while for Site 3,this difference was not significant.And the difference of TCB in Site 2was much greater than that in Site 1.These results suggested that there were significant differences for TCB in soils of mainstream and tributaries.In addition,TCB in soils of 10–20 cm had significant or highly significant positive correlations with MeHg level(r C 0.762,P B 0.048),thus we assumed that there may be some aerobic microorganisms playing dominant roles in mercury methylation.     

Spatial distribution of bacterial community in EGSB reactor treating synthetic sulfate-containing wastewater at low organic loading rate

Given that the consumption of organic sub- stances entails costly biodesulfurization, the characteristics of the bacterial community in a reactor should be deter- mined to increase the desulfurizing rate under low organic loading condition. In this study, the bacterial community distribution in the expanded granular sludge bed reactor used to treat sulfate-containing wastewater with low organic loading rate was determined by polymerase chain reaction-denaturing gradient gel electrophoresis （PCR- DGGE） and 16S rDNA clone library analyses. DGGE results showed that the predominant bacteria were stable and accounted for -90 % sulfate removal efficiency. Differences in band positions and intensities indicated that the distribution and abundance of bacteria were affected by their positions in the reactor. Typical bands were identified in the bacterial community comprising Desulfovibrio, Desulfomicrobium, Thiomonas, Acinetobacter, Bacteroi- detes, and Chloroflexi. Their functions in the reactor were also discussed. The possible links between the functional and microbial responses were also investigated based on the characteristic and spatial distribution of each bacterium in consortium.     

摄动理论与多时标方法在大系统降阶中的应用

非奇异摄功和奇异摄动理论在系统科学中的应用,是近几年来国际上出现的一个新的学术分支。这一理论的多时标方法在大系统降阶中得到了成功的发展。本文综述有关概念和主要研究成果,介绍线性系统时标分解的迭代法和测度法,并通过例子说明理论与方法的成功应用。     

广义双连对角占优矩阵

引入广义双连对角占优矩阵的概念,证明广义双连对角占优的可逆性,讨论它们与Ｍ矩阵的关系,并给出了广义双连对角占优矩阵特征值的一些性质．     

番茄汁乳酸菌发酵饮料的研制

以番茄为原料,经乳酸菌发酵而制成番茄汁乳酸菌发酵饮料,通过对接种量、发酵时间、发酵温度、风味、稳定性进行实验,从而确定出最佳工艺参数为：接种量５％,发酵温度４０℃,发酵时间３０ｈ,黄原胶０．０３％,耐酸性ＣＭＣ－Ｎａ０．０２％。     

转CaM基因工程菌的培养及重组钙调素的提纯

研究了转植物ＣａＭ基因的大肠杆菌的培养以及从该工程菌中分离纯化ＣａＭ的方法,观察到在含氨苄青霉素及氯菌素的ＬＢ液体培养其中,     

小麦内生菌的分离与鉴定

试验从武汉市郊6个地块的小麦中分期、分部位取样,采用常规的细菌分离方法分离到26株内生菌,经形态学、培养及生理生化特征鉴定,它们分别属于蜡状芽孢杆菌(B.cereus)、多粘芽孢杆菌(B.polymyra)、巨大芽孢杆菌(B.negaterium)、坚强芽孢杆菌(B.fiuum)和草状芽孢杆菌(B.mycoides).     

黄东海多毛类动物种类组成与优势种分析

【目的】探明黄东海区域多毛类Polychaeta物种组成状况。【方法】用0.1 m2 Gray-O’Hara箱式采泥器重复采样2次,对获得的多毛类样品进行准确的分类鉴定,采用优势度计算公式:Y=(ni/N)fi统计得出优势种并分析其空间分布状况。【结果】本次调查黄东海共鉴定出多毛类32个科90种,优势种为背蚓虫Notomastus latericeus Sars,1857和掌鳃索沙蚕Ninoe palmata Moore,1903,其分布没有表现出明显的规律性。【结论】黄东海多毛类种类丰富,优势种随时间变化而改变,而分类学研究应引起重视。