高校图书馆借阅制度的人性化改革设想

图书馆规章制度是做好和检验图书馆各项工作的标尺和准则,它必须随着图书馆各项工作的发展、变化而不断发展。图书馆的发展与现实表明,传统的借阅服务制度与服务方式不能适应时代要求,建立人性化的借阅制度势在必行。     

肇庆城区2008年度蔬菜农药残留的监测及分析评估

随着社会需求从多数量到高质量的快速转型,食品安全已经成为人们日常生活中重要的内容．新鲜的蔬菜更是每日餐桌上必备的食物,因此蔬菜生产的安全也是人们食品安全重中之重的监测对象,通过监测、及时治理以确保市民蔬菜食用安全。     

Influence of several postharvest processing methods on polyphenol oxidase activity and cichoric acid content of Echinacea purpurea roots

Retaining the bioactive ingredients of medicinal plants is a crucial step in ensuring their functional or medicinal value. To help select the best method for retaining cichoric acid in roots of Echinacea purpurea (L.) Moench, four postharvest processing methods namely air drying, hot water bath, steam heating and microwave drying were compared. For each method, different parameters of polyphenol oxidase (PPO) activity, cell ultrastructure, and cichoric acid content were studied. We found that PPO activity should be inactivated quickly before the destruction of cell ultrastructure during processing to avoid cichoric acid (CA) oxidation. Cichoric acid retention among the four methods ranked as follows: air drying < hot water bath < steam heating < microwave drying. Considering relative costs and restrictions in the microwave equipment's input quantity, a traditional processing method for Chinese herbs, steam heating, was considered as the most practical method for processing roots of E. purpurea.     

短轮伐期桉树人工林土壤温度特征分析

Based on the data collected from 2008 to 2010 in Eucalyptus plantation of Gaoyao city, Guangdong Province, the annual variation, seasonal variation and daily variation of soil temperature before and after rotation were analyzed. The result showed that the soil temperatures of various layers had a significantly positive correlation with the surface temperature. The annual variation of soil temperature showed a unimodal distribution and the annual amplitude became smaller in deeper layer. The daily variation followed a sinusoid and the daily amplitude became smaller in deeper layer. The peak value appeared later with the increasing of soil depth. The annual amplitude of the soil temperature in 2009 after the rotation (13.58 ℃) was smaller than in 2008 before the rotation (15.37 ℃). The peak value time appeared 1 hour ahead and the daily amplitude increased.     

早稻田白背飞虱和褐飞虱种群发生新态势

系统调查研究了近年白背飞虱和褐飞虱在粤西双季早稻田中的发生动态。结果表明 ,在广东肇庆地区早稻种植区稻飞虱田间种群一般 5月上旬、5月底到 6月初出现 2个发生高峰。近年白背飞虱成为早稻上稻飞虱中的优势害虫。在当地水稻栽培品种中以茉莉新占、山溪占类品种稻飞虱发生数量较高。     

阿维菌素对斑点叉尾鮰的急性毒性试验研究

为研究阿维菌素对斑点叉尾鮰的急性毒性作用,采用生物毒性方法,记录96h内斑点叉尾鮰的死亡情况和观察其毒性反应。结果表明,阿维菌素对斑点叉尾鮰96h半数致死浓度为9.869×10-3mg/L,95%可信区间范围为9.629~10.103×10-3mg/L,安全浓度为2.754×10-3mg/L。本研究结果说明,阿维菌素对斑点叉尾鮰为剧毒药物,在其养殖生产中需谨慎使用。     

两种检测罗氏沼虾诺达病毒方法的比较

分别用三抗体夹心酶联免疫吸附测定、逆转录聚合酶链式反应两种方法,检测20尾采集自广东省肇庆市的典型白肉病症状罗氏沼虾肌肉中的诺达病毒。检测结果是两种方法阳性检出率均为95%。结果表明,两种方法均能有效的应用在实验室检测罗氏沼虾诺达病毒。     

肉桂后半啮的生物学特性及其防治

肉桂后半啮是桂皮产品的主要仓储害虫,在广东１ａ发生３～４代,世代重叠。以成虫在土壤缝隙中越冬,翌年３月下旬开始产卵,完成一代约４５～５５ｄ。每年６～７月是肉桂后半啮发生危害的高峰期,采用常规清洁措施结合药物防治效果较好。     

高要市暴雨天气气候特征分析及其对农业生产的影响

通过对高要站1954～2008年日雨量资料进行分析,得出高要市暴雨的气候特征,归纳出影响高要暴雨的10种天气形势类型,并通过2个典型个例阐述了暴雨对高要市农业生产的影响。     

肇庆市鼎湖山周边马尾松纯林生态改造探讨

肇庆市鼎湖山周边连片的马尾松林大部分是上世纪飞播的,长势差,已明显衰退,林下有大量可燃、易燃凋落物,森林火险等级高,防火压力大,对鼎湖山国家级自然保护区构成极大的火灾威胁,而且生态功能低、景观效果差;采取带状和块状改造,引入生态功能稳定、具有较高观赏价值、长寿的地带性阔叶树种,形成景观林带和景观斑块,营造群落结构优化、防火功能较强、生态功能稳定、景观特色明显、生物多样性较高、生态服务持续的森林,达到绿化、美化、生态化。