鞘丝藻和颤藻对污水净化能力的实验研究

在反应器中装满填料并接种鞘丝藻和颤藻,经培养驯化后填料上生长藻类膜.藻类膜能大大提高藻类的浓度,其处理效果优于普通的悬浮藻系统.藻类利用污水中的氮源和磷源来合成细胞物质,3d时间对氨氮的去除率可以达到81.5%,对磷酸盐的去除率可以达到94.4%,同时使出水中溶解氧含量明显提高,水质大大改善.藻类在填料上挂膜容易,易于脱落以保持活性,并易于和水分离.     

Effects of litter removal on plant species diversity: a case study in tropical Eucalyptus forest ecosystems in South China

The removal of litterfall in the Eucalyptus plantations in South China affected the plant biodiversity in these ecosystems was found based on the field observation and lab analysis.The protection times of species diversity of three Eucalyptus communities were different (Community Ⅰ with no protection,Community Ⅱ with 7-year-protection,Community Ⅲ with 35-year-protection).The total numbers of species in these communities(from Community Ⅰ to Ⅱ to Ⅲ)are 1,6,and 17,respectively.The tesults showed that the protection of litterfall from being taken out of the ecosystem is important and can increase plant species diversity.This study ombined biomass data,the chemical and physical properties of the soil,and the diversity of microbes in the communities.It is concluded that the mechanism of the effects of litter removal on biodiversity includes three factors:removing the suitable habitat of microbe and animal,decreasing the soil mutrient, and changing the special habitat for the germination and growth of invading plants.These results should have important implications for managing these Eucalyptus forest ecosystems in South China.     

海南岛热带农业光能资源利用率研究

本文通过绿色植物能量转化的生理机能,即光合作用过程中太阳能的投入、转化和产出的内在联系,定量地描述了海南岛各地实际光能利用率;地区性农业生产潜力;潜在光能利用率及其与实际光能利用率的绝对差值。结果表明,全岛实际光能利用率低于全国平均水平,只及一年两熟地区的一半,高值区接近一年一熟地区;潜在光能利用率与世界热带地区差距不大;潜在与实际光能利用率之差全岛平均达5.1％,具有较大的增产潜力。文中还针对海南的实际粗略地探讨了岛内光能利用率不高的原因和提高光能利用率的相应途径。     

粘红酵母(Rhodotorula glutinis CIBAS A 1401)苯丙氨酸解氨酶cDNA核心序列的克隆与分析

L苯丙氨酸因其在工业、医药上的重要作用而日益受到人们的重视.苯丙氨酸解氨酶(PAL)生物转化肉桂酸生产L苯丙氨酸成了该领域研究与开发的热点.本文利用简并寡核苷酸PCR法结合cDNA末端快速扩增PCR法,从粘红酵母中克隆了苯丙氨酸解氨酶cDNA核心序列,为克隆其cDNA全长序列及体外表达其活性蛋白奠定了基础.图5参22     

含硫酸盐高有机物浓度酵母生产废水两相厌氧处理

采用“铁床＋产酸相＋空气吹脱＋产甲烷相”相串联工艺处理富含硫酸盐的高浓度酵母生产废水，实现了硫酸盐及有机物有效去除的双重目标。     

T—2毒素与硒对酵母生长的影响及其拮抗作用

通过培养产朊假丝酵母比较RNA与蛋白含量的变化,评价加入培养基中的T-2毒素与硒的细胞毒性和生理活性.试验表明,5ppm T-2毒素明显抑制产朊假丝酵母的生长,1ppm硒对生长的促进作用显著,且可完全拮抗5ppm T-2毒素的毒性.     

能够固定碳的热带林业实践：综述和东南亚案例研究

为了完成对《气体框架公约》所承担的义务，发达国家开始寻找可供选择的成本低效率高的减少温室气体排放的方法。这就引起了对基于森林的碳平衡的关注。植树和林业实践能够用于主动地移走大气中的ＣＯ２。