新时期应用型本科院校师资队伍建设的思考

目前创新创业教育已成为高等院校教育发展的新思路，作为高校中最宝贵资源的师资队伍状况能否适应这一新形式的要求值得探讨。为此，本文从应用型本科院校师资队伍建设的现状着手，分析了适应创新创业教育发展的师资队伍的特点，并总结了适应新形式的应用型本科院校师资队伍培养的有效途径。     

千万不可忽视良种黄牛的保种问题

阐述了良种牛保种的重要意义．基因的随机漂移、选择与杂交、近交是特定基因从群体中消失的主要原因，群体及其有效含量和系统选育的科学组织是保种的重要内容。最后介绍我国良种牛的保种方法及其存在的问题，并提出解决的办法。     

龙薯1号在丘陵山地高产高效栽培技术研究

为探讨龙薯1号在丘陵山地高产高效栽培技术,2005-2006年对龙薯1号进行了栽培试验,试验采用单因子随机区组排列,重复三次进行。产量对比分析结果显示:种植密度应控制在45500~55500株/hm2;施夹心肥的效益比施夹边肥高;每公顷应施纯氮120 kg、五氧化二磷90 kg、氧化钾210 kg、硼砂15 kg;封垄时喷300kg/hm2多效唑溶液1次。     

Contribution of microorganisms to the biofilm nutritional quality: protein and lipid contents

The nutritional quality of biofilm, a microbial community associated to an organic matrix, was evaluated in artificial substrate (polyethylene screen) in net cages during 30 days in the Patos Lagoon estuary, Southern Brazil. During this period, samples of biofilm were collected each 5 days for analysis of chlorophyll a, microorganisms abundance, dry weight, protein and lipid contents. During the study, chlorophyll a varied from 0.38 to 2.75 μg cm^?2; dry weight between 7.16 and 17.63 mg cm^?2; protein content from 0.43 to 1.76 mg cm^?2 and lipid concentration between 1.21 and 4.23 mg cm^?2. The variation of lipid in the biofilm was closely related to the abundance of free heterotrophic bacteria (34.25–56.54 × 10⁶ cells cm^?2), filamentous cyanobacteria (7.5–15.9 × 10⁶ filaments cm^?2), flagellates (6.92–12.89 × 10⁶ cells cm^?2) and mainly nematodes (29–1,414 organisms cm^?2), while protein content varied similarly to the abundance of unicellular centric diatoms (52.10–179.81 × 10³ cells cm^?2), and nematodes. This information will allow a better management of food supply to raised aquatic organism with the utilization of natural productivity in the culture systems, with considerable decrease in production costs.     

木霉菌和番茄叶表主要微生物间关系

对番茄叶表分离到的几种真菌和木霉菌BTW41(T.atroviride)之间相互关系作了初步研究,研究发现木霉菌具有较强的营养竞争能力,几种叶面真菌和木霉菌混合处理叶片试验中,黑曲霉菌混合木霉菌的处理会影响木霉菌在番茄叶表的定殖,使木霉菌在番茄叶表的定殖量减少,而其它几种真菌未使木霉菌定殖量减少。     

Logistic方程在微生物分批培养动力学中的应用

将生态学领域中的Iogistic方程引入微生物动力学的研究中，建立了3个分别基于Monod方程、Herbert方程和Logistic方程的关于培养基中的微生物浓度(χ)和底物浓度(s)的模型以形成对照．同时建立了基于Logistic方程的关于微生物浓度(χ)和时间(t)的模型．这些均采用实验数据拟合以证明其精确性．该工作有助于研究微生物生长特性，同时有助于进一步地研究可生化降解的有机物在水体的微生物作用下的氧化分解过程，建立新的河流、湖泊、水库等生物学水质模型．本研究中采用的数值方法是非线性最小二乘法、Interior-reflective Newton算法．在Lorynebacterium glutamicum分批培养和Pseudomonas sp．分批培养中，基于Logistic方程的χ-s模型拟合的相关系数分别是0.9940和0．9867，在Pseudomonas sp．分批培养中，z-t模型拟合的相关系数是0．9972。     

桔皮提取物抑制霉菌试验

试验选用乙醚，丙酮，乙醇３种溶剂提取桔皮中有效成分，分别制成６０％的乳剂，用灭菌蒸馏水稀释成不同浓度梯度，加入培养其中进行抑制霉菌试验。     

Assessment of Rhizospheric Microorganisms of Transgenic Populus tomentosa with Cowpea Trypsin Inhibitor (CpTI) Gene

To have a preliminary insight into biosafety of genetically transformed hybrid triploid poplars (Populus tomentosa × P. bolleana) × P. tomentosa with the cowpea trypsin inhibitor (CpTI) gene, two layers of rhizospheric soil (from 0 to 20 cm deep and from 20 to 40 cm deep, respectively) were collected for microorganism culture, counting assay and PCR analysis to assess the poten-tial impact of transgenic poplars on non-target microorganism population and transgene dispersal. When the same soil layer of suspension stock solution was diluted at both 1:1 000 and 1:10 000 rates, there were no significant differences in bacterium colony numbers between the inoculation plates of both transgenic and non-transgenic poplars. The uniform results were revealed for both soil layer suspension solutions of identical poplars at both dilution rates except for non-transgenic poplars at 1:10 000 dilution rates from the same type of soil. No significant variation in morphology of both Gram-positive and Gram-negative bacteria was observed under the microscope. The potential transgene dispersal from root exudates or fallen leaves to non-target microbes was repudiated by PCR analysis, in which no CpTI gene specific DNA band was amplified for 15 sites of transgenic rhizospheric soil samples. It can be concluded that transgenic poplar with the CpTI gene has no severe impact on rhizospheric microorganisms and is tentatively safe to surrounding soil micro-ecosystem.     

湖南省退耕还林工程成效分析

自2000年退耕还林工程在湖南省实施以来,取得了有目共睹的成绩,被农民誉为“民心工程”和“德政工程”。通过分析退耕还林工程在湖南取得的生态效益、经济效益和社会效益,提出了保障“三大效益”的政策措施。     

森林土壤标准物质的研究——样品的采集、制备与均匀度、稳定性检验

本文报道了按照森林土壤标准物质要求采集的二个土壤样品（碱性土－碱灰性褐土；酸性土－黄红壤）和一个植物样品（杉木叶）的制备过程，粒径2mm的土壤样品采用Y型混样，0．149mm的土壤和0．177mm的植物样品采用高铝瓷球磨制备，土壤样品用高湿灭活，植物样品用^60Co辐射灭活，在二年测定标准样品稳定性和同时进行标准样品中微生物类群和数量的分析。土壤、植物标准样品的均匀性和稳定性采用数理统计方法检验，其结果均达到标准物质要求。