转基因植物对蜜蜂的安全性（下）

转基因植物已在全球范围内大面积推广应用 ,全球 5大转基因植物中的油菜、棉花、玉米均是主要的蜜粉源植物 ,对养蜂生产有重要意义 ,其对蜜蜂的安全性问题值得关注。 2种主要的抗虫 (Bt毒蛋白、蛋白酶抑制剂 )基因或抗真菌基因的产物只有在高浓度时才可能对工蜂的寿命、消化酶活性、行为等有不良影响。从目前的研究来看 ,转基因植物对蜜蜂是安全的     

2008-2015年橡胶蜂蜜产量与气候的相关性分析

为了进一步发掘橡胶林区潜在经济价值,预测下一年橡胶泌蜜规律,试验采用连续8年记录转地到西双版纳傣族自治州采集橡胶蜜的蜂场收获蜂蜜情况,并以气象观测仪记录当时的气象变化的方法。表明进入橡胶场地的蜂群势变化不大[(13.450±0.113)脾,=0.854],但产量变化显著[(72.613±0.349)kg,<0.01]。气象观测表明气温8年内波动范围不大,而降雨量波动大,表现为2011年洪涝出现早,2014年干旱持续时间长。产量与日平均气温(相关系数r=0.337)有极显著的正相关性,与日降雨量(相关系数r=-0.269)及日最低气温(相关系数r=-0.483)呈极显著的负相关,与群势表现出轻微的负相关(相关系数r=-0.031)。说明持续的干旱和温暖湿热的气温及合理的群势能够增加橡胶蜜的产量,适宜的气候及大面积橡胶林区蕴含着巨大的养蜂潜力。     

农村社区公益性文化建设中几个问题的阐释

对农村社区公益性文化建设中几个问题进行了阐释,指出推进农村社区公益性文化建设,应重视农村权威人物发挥积极作用,预防其消极作用;应重视农民工对乡村社会的影响力,引导农民工对农村社区建设发挥积极作用;应重视农民闲暇生活,用先进文化占领这一重要阵地。     

Learning performances of honeybees (Apis mellifera L) are differentially affected by imidacloprid according to the season

To establish the sublethal concentrations domain, acute and chronic oral tests were conducted on caged honeybee workers (Apis mellifera L) using imidacloprid and a metabolite, 5-OH-imidacloprid, under laboratory conditions. The latter showed a 48-h oral LD50 value (153 ng per bee) five times higher than that of imidacloprid (30 ng per bee). Chronic feeding tests indicated that the lowest observed effect concentrations (LOEC) of imidacloprid and of 5-OH-imidacloprid on mortality of winter bees were 24 and 120 microg kg(-1) respectively. Behavioural effects of imidacloprid and 5-OH-imidacloprid were studied using the olfactory conditioning of proboscis extension response at two periods of the year. Winter bees surviving chronic treatment with imidacloprid and 5-OH-imidacloprid had reduced learning performances. The LOEC of imidacloprid was lower in summer bees (12 microg kg(-1)) than in winter bees (48 microg kg(-1)), which points to a greater sensitivity of honeybees behaviour in summer bees, compared to winter bees.     

The Control of Varroa destructor Using Oxalic Acid

Twenty-four honeybee (Apis mellifera) colonies were used to monitor the efficacy of a solution of 2.9% oxalic acid (OA) and 31.9% sugar against the mite Varroa destructor. Mite mortality was established prior to and after OA treatments, which were conducted in August and September. The treatments resulted in 37% mite mortality as opposed to 1.11% in the controls. OA treatment conducted in September on previously untreated colonies resulted in 25% mite mortality. OA treatments in October and November resulted in approximately 97% mite mortality. These results suggest that OA is effective during the broodless period and less effective when applied to colonies with capped broods. The possible use of OA against the Varroa mite in honeybee colonies as an alternative to routine chemical treatments is discussed.     

超临界萃取技术及其在蜂产品加工中的应用

本文简要介绍了超临界萃取技术及其在蜂产品提取中的应用。     

蜜蜂主要病虫害调查及防治试验报告

针对西方蜜蜂病虫害频繁发生的严竣形势，我们通过典型调查和引进高效低毒药物进行有目的地防治试验．共防治蜜蜂1021群，治愈951群，有皴率93．1％，取得了比较满意的效果。     

中华蜜蜂工蜂碱性磷酸酶功能基团的研究

在一定条件下，分别采用二硫代二硝基苯甲酸（DTNB）、N-溴代琥珀酰亚胺（NBS）、苯甲基磺酰氟（PMSF）、溴乙酸（BrAc）、乙酰丙酮、巯基乙醇（ME）等化学修饰剂选择修饰中华蜜蜂碱性磷酸酶多种氨基酸残基，并测定其酶活力变化。结果表明，DTNB、PMSF的修饰不表现对酶的抑制作用，而NBS、BrAc、ME能显著抑制酶的活力，乙酰丙酮也能抑制酶的活力，但是不太明显。因此认为Trp、His是中华蜜蜂工蜂碱性磷酸酶的必需功能基团，部分二硫键对保护酶的催化功能也是必需的。     

讨价还价模型框架下的农民工权益问题分析

利用讨价还价模型对农民工的权益问题进行了分析,研究表明：保障农民工权益的当务之急是提高农民工加入工会的积极性,并采取有效措施充分提升工会的讨价还价能力。     

农民工民间组织发展的制度环境分析

介绍了制度环境的内涵与外延，分析了农民工民间组织发展的制度环境，即：宏观制度环境、微观制度环境及制度执行环境。