国有林场转制与管理体制创新研究

随着全球生态环境保护意识的增强和绿色消费主义的大力兴起,林业的地位迅速飚升、日益重要,森林的内涵与外延逐步加深和扩大。森林资源的价值观已从以往单纯追求经济利益的生产功能,更多地转向生态、社会和人文方面的环境功能。本文通过分析武汉市国有林场管理体制的现状及存在的问题,对其管理体制改革提出了建议,并着重从创新方面进行了探讨。     

浅析我国中小饲料企业融资困境及对策

资金是企业发展的第1推动力和持续推动力,中小饲料企业要持续健康地发展离不开资金的供应与支持,然而在我国,融资瓶颈已成为制约中小饲料企业发展的障碍。在此背景下,本文对我国中小饲料企业的融资现状进行了简要分析,在此基础上又从内外两个角度分析了导致融资瓶颈出现的原因,     

经济新常态下竹产业发展对策思考——-以安吉为例

浙江安吉位居"中国十大竹子之乡"之首。安吉竹产业在全国竹产业中具有重要地位,并在保护生态环境、帮助山区农民增收致富、推进新农村建设中发挥着极其重要的作用。文章对安吉竹产业发展情况进行了回顾总结,分析了竹产业发展中存在的问题,并结合经济新常态下的发展要求,提出安吉竹产业发展的对策,以期为浙江省竹产业的转型升级提供借鉴。     

农作物乙醇燃料的综合效益分析

乙醇作为化石燃料的替代品,对于能源需求日趋紧张的中国来说具有非常重要的意义.然而,农作物乙醇作为燃料其生命周期、经济效益及环境效益如何将直接影响其推广使用.文章就农作物乙醇作为燃料的综合效益进行了全面分析,得出了除甜高梁外多数农作物作为燃料乙醇原料具有较低的能效转换率之结论.而且在目前情况下,由于生产成本较高,所产生的经济效益也较差.但其对于解缓能源紧张问题、提高农民收入、促进人员就业具有良好的社会效益,同时对机动车辆的废气污染排放有所改善.     

阿维菌素与橡胶籽油复配对朱砂叶螨的联合作用

室内测定了阿维菌素和橡胶籽油对朱砂叶螨的毒力及其复配剂的联合作用。结果表明，阿维菌素和橡胶籽油对朱砂叶螨雌成螨的LC50分别为0.01 μg/ml和1311.81 μg/ml；阿维菌素与橡胶籽油复配对朱砂叶螨成螨增效作用显著，共毒系数最高为293.90；阿维菌素及其与橡胶籽油最优复配剂对经药剂处理螨卵孵化的若螨具有显著的杀灭活性，且相同浓度下复配剂显著优于阿维菌素单剂，但两药剂对螨卵的直接毒杀活性均很低。阿维菌素与橡胶籽油复配剂这一高效、安全生物农药在害螨防治中极具应用前景。     

Effects of different arginine/lysine level on growth performance,body composition and digestive enzyme activity of Macrobrachium rosenbergii

Given the universal presence of antagonism between arginine and lysine, determining the optimal dietary arginine/lysine level is of great importance. In this study, eight diets were formulated to contain different arginine/lysine level, followed by a 9‐week feeding trial with shrimps of 2.10 ± 0.01 cm in length and 0.38 ± 0.02 g in weight to determine the effect of dietary arginine/lysine level on growth performance, body composition and enzyme activity. The results showed that the Diet 6 (arginine/lysine level of 29.4/21.0 g/kg) group had significantly higher weight gain rate, and specific growth rate than the control group and most of the other groups (p < .05) did. Similarly, the retention efficiency of arginine and lysine in the Diet 6 group was significantly higher than the control group and most of the other groups (p < .05). Moreover, most digestive enzymes had higher activity levels in the Diet 6 group, and evident antagonism between dietary arginine and lysine was detected. In summary, dietary arginine/lysine level of 29.4/21.0 g/kg produced the best growth performance, suggesting that a better growth performance in Macrobrachium rosenbergii culture can be obtained by adjusting the dietary arginine/lysine level.     

Guinea Pig Model of Uterine Leiomyoma Established by Intragastric Administration of Estrogen

[Objective] The paper was to establish the guinea pig model of uterine leiomyoma by intragastric administration of estrogen and to dis-cuss the effect of different doses and administration cycles on formation of uterine leiomyoma. [Method] Mature female guinea pigs were divided into short term model group and long term model group, and intragastrically administrated with estradiol valerate at the dose of 0.1 mg/100 g body weight twice a week for 6 and 8 weeks respectively. Guinea pigs intragastrically administrated with equal volume of normal saline were set as con-trol. After 6 or 8 weeks, the guinea pigs were sacrificed. The serum levels of estrogen and progesterone were measured by ELISA and the leiomyoma formation rate was measured. Histological changes were compared between treatment group and control group with HE staining. [Results] The leiomyoma formation rate was 30% in short term model group and 40% in long term model group. The overall leiomyoma formation rate was 35%.The serum level of estrogen in model animals increased significantly and the progesterone level decreased in long term model group. Histopathologi-cal examination confirmed that the guinea pig model of uterine leiomyoma was established successfully. [Conclusions] Intragastric administration of estrogen is a simple and effective method for establishing guinea pigs model of uterine leiomyoma.     

碳链周围水结构与表面活性剂胶团化中熵增关系研究

本文提出了水分子在碳链周围形成笼状５员环结构的模型，并得出了ｍ个碳形成的直链在脱除其周围笼状水分子时，引起体系的熵增△Ｓ＝－３．１Ｋ［（０．５７５ｍ＋４．５１）Ｉｎ（０．５７５ｍ＋４．０１）－０．５７５ｍ）］。利用温度、ＮａＣｌ等对烷基硫酸钠ｃｎＨｚｔｕ＋ＩＳＯ４Ｎａ（ＣｎＳ，ｍ＝８，ｌ０，１２）ｃｍｃ的影响，求出２５℃时Ｃ＿ｍＳ胶团化过程中的△Ｓ°。结果发现，Ｃ＿ｍＳ的△Ｓ°和（０．５７５ｍ＋４．５１）Ｉｎ（０．５７５ｍ＋４．０１）－０．５７５ｍ之间有很好的线性关系。该关系式具有普遍的意义，从而证明了模型的可靠性。     

番茄及其近缘野生种茎段原生质体培养的研究

利用番茄茎段作为原生质体来源的外植仁,在适宜的培养基中,成功地获得了野生秘鲁番茄（Ｌｙｃｏｐｅｒｓｉｃｏｎ ｐｅｒｕｖｉａｎｕｍ Ｍｉｌｌ．）、栽培番茄‘粤农２号’（Ｌｙｃｏｐｅｒｓｉｃｏｎ ｅｓｃｕｌｅｎｔｕｍ ‘Ｙｕｅｎｏｎｇ Ｎｏ．２’）和番茄近缘里生种类番茄茄（Ｓｏｌａｎｕｍ ｌｙｃｏｅｒｓｉｃｏｉｄｅｓ Ｄｕｎ．）的再生植株。３种材料的再生植侏移植到土壤中均能正常生长,植株性状与对照无差     

黑麦草耐盐性的研究

通过对黑麦草进行不同浓度N aC l溶液的盐胁迫处理,研究了黑麦草叶片在幼苗期盐胁迫条件下叶绿素、游离脯氨酸、过氧化脂质及可溶性糖含量的变化。结果表明：在盐胁迫处理下,黑麦草叶片中叶绿素含量呈下降趋势,游离脯氨酸、过氧化脂质、可溶性糖含量均呈上升趋势。