加大建设新农村的农业财政投资力度研究

农业是维持我国社会稳定和国民经济持续健康发展的基础产业，农业具有“准公共产品”属性，决定了政府必须介入农业领域进行投资与保护，农业财政投资与农业发展密切相关。论文在对财政支持与农业发展理论思考的基础上，针对当前我国农业财政投资的现状和存在的问题进行了研究，对产生问题的宏观制度性根源进行了分析，并提出了相应的政策措施。     

番鸭细小病毒和鹅细小病毒二联弱毒细胞苗的研究

应用适应于番鸭胚成纤维细胞(MDEFC)上繁殖,并产生细胞病变的鹅细小病毒(GPV)弱毒疫苗株与番鸭细小病毒(MPV)弱毒疫苗,按适当比例混合,试制了MPV-GPV二联弱毒细胞苗,并测定了各项免疫指标.结果显示试制出的二联苗对1日龄雏番鸭具有良好的安全性和遗传稳定性;免疫后5 d和7 d攻击GPV强毒,保护率分别为75%和100%,同时免疫后7 d血清中MPV-胶乳凝集抑制(LPAI)抗体效价均大于21,21～28 d抗体达高峰,有效免疫期超过60 d.疫苗于-20℃保存期大于12个月.上述结果表明,二联弱毒细胞苗安全有效.     

高速公路边坡生态恢复技术进展

论述了高速公路给生态环境带来的影响,总结了国内外高速公路边坡生态恢复的研究现状和常用的边坡防护技术,提出工程防护与植物防护有机结合的生态防护是高速公路边坡生态恢复的重要措施。同时指出了我国高速公路边坡的生态恢复在技术模式、植物选择、施工与养护等方面存在的问题;提出要建立适用于不同路域的生态恢复模式、选用乔灌草有机搭配的乡土植物、加强有效监督机制与后期养护和环境评估等建议。     

草粮轮作与农田生态平衡——兼论 Ladino 白三叶的生态经济效益

利用无性繁殖法定植Ｌａｄｉｎｏ白三叶（Ｔｒｉｆｏｉｕｍｒｅｐｅｎｓ）和雅安逸生白三叶（Ｔ．ｒｅｐｅｎｓ），地上部生物量前者比后者表现出极显著差异；地下部生物量和贮氮量表现为显著差异。后作玉米产量，Ｌａｄｉｎｏ白三叶地为６．２９ｔ／ｈａ大于雅安逸生白三叶地（６．１５ｔ／ｈａ）；农田生态系统里前者表现为正氮平衡，后者表现为负氮平衡，前者土壤固相、液相和气相比为１∶０．５∶０．２５明显优于后者；前者Ｃ／Ｎ比适中，后者Ｃ／Ｎ过窄，其抗性雅安逸生白三叶低于Ｌａｄｉｎｏ白三叶。三种种子直播的豆科牧草的生态经济特性表现为南苜蓿（Ｍｅｄｉｃａｇｏｈｉｓｐｅｄａ）大于苕子（Ｖｉｃｉａｃｏｒａｃｃａ），紫云英（Ａｓｔｒａｇａｌｕｓｓｉｎｉｃｕｓ）则介于两者之间。草粮轮作周期证明，Ｌａｄｉｎｏ白三叶和南苜蓿以及苕子是无性繁殖和有性繁殖的最佳材料，值得广泛推广利用。     

对耕地保护的认识和思考

耕地保护的落实关系到我国的粮食安全,经济安全,生态安全。为了能够对耕地保护有一个更好的认识,文章从耕地保护的提出、目标、意义、主体、策略等方面来再次的认识耕地保护,耕地保护需要政府、农民以及其他非耕地使用者的共同参与,并提出了进一步建立和完善耕地保护的经济补偿机制,充分调动农民对保护耕地的积极性,明确耕地产权的耕地保护策略。     

Comparison of antibody values in sera of pigs vaccinated with a subunit or an attenuated vaccine against classical swine fever

Ten pigs, aged 85 days, were vaccinated with a subunit vaccine containing 32 g of classical swine fever virus glycoprotein E2 (gp E2) (group 1), and a further 10 pigs were vaccinated with a C strain vaccine (10^4±0.15 TCID₅₀/ml), produced by amplification in minipig kidney (MPK) cell culture (group 2). Nine non-vaccinated pigs served as a control group (group 3). Serum samples were collected before (day 0) and at 4, 10, 21 and 28 days after vaccination and were analysed by two commercially available enzyme immunoassays and by a neutralizing peroxidase-linked assay (NPLA). At the same times, peripheral blood was taken for determining the total leukocyte count and the body temperature was taken daily. Antibodies were not detected in serum samples collected before vaccination (day 0), and no side-effects that could be connected with vaccination were observed during the trial. Ten days after vaccination 6/10 pigs vaccinated with the subunit vaccine were seropositive. On days 21 and 28, the ratios of serologically positive to vaccinated pigs were 9/10 and 10/10, respectively. Four of the ten pigs that were vaccinated with the C strain vaccine were positive on day 21 and 9/10 on day 28. However, the results of the NPLA showed that only 4/10 pigs had an antibody titre >1:32 at the end of the trial in both the vaccinated groups, even though the subunit vaccine initiated an earlier and higher level of neutralizing antibodies than the vaccine produced from the C strain. Challenge was performed 28 days after vaccination on four randomly selected pigs from both vaccinated groups. The pigs survived the challenge without showing any clinical signs of classical swine fever (CSF), while two nonvaccinated control pigs died on the 10th and 12th days after infection.     

生态红线划定研究综述

生态红线顾名思义指生态安全保护的底线,是中国在生态环境保护领域的一项制度创新,当前已经上升为国家战略,体现了国家以强制性法律手段严格实施生态保护政策的导向,更进一步体现了我国生态文明建设的重要举措。本文通过文献梳理,理清了生态红线的定义和内涵,综述了生态红线划定的指标体系和方法,概述了划定生态红线的国内外研究现状,并对生态红线划定理论,详细介绍了目前借助重要功能区、生态敏感区和禁止开发区划定生态红线的方法并指出其不足之处,继而对研究区生态红线划定中的关键问题以及对应的措施提出了建议,为全面科学研究生态红线提供指导。     

Identifying Wildlife Species Believed to be Deserving of Protection From Hunting by U.S. Residents

This article examines the perceptions of individuals toward protecting animals from hunting. Researchers surveyed 825 U.S. residents in an online survey about their views of whether 17 species of mammals should be protected from hunting. Over 85% of respondents believed elephant, white rhino, black rhino, hippo, leopard, lion, and polar bear species should be protected from hunting. Conversely, only 55% of respondents believed mountain lion and coyote should be protected. Cross tabulations and logit analysis were employed to explore relationships between believing an animal species should be protected from hunting and demographics. Older and female respondents more often agreed that species should be protected from hunting. Those who hunted or knew a hunter less frequently agreed that the species surveyed should be protected from hunting. Demographics and previous exposure to hunting appear to influence beliefs about what species should be protected from hunting.     

硒对鸭镉中毒保护效应的研究

６６只３日龄天府肉鸭随机分为６组,其中一组每日上、下午灌服蒸馏水作为试验对照组,另５组每日早晨灌以１／２０ＤＬ５０（１４．４７ｍｇ／ｋｇ体重）的氯化镉水溶液作试验组,试验Ⅰ－Ⅳ组每日下午分别再灌以３．３９、１．６９、０．８５、０．４２ｍｇ／ｋｇ的硒,第Ⅴ组灌服蒸馏水。试验期６周,其发病率和死亡率分另为１０／１１、９／１１、１０／１１、１０／１１、１１／１１、和４／１１、３／１１、２／１１、４／１１     

Mucus characterisation in the Octopus vulgaris skin throughout its life cycle

The development of the epidermis of octopus, Octopus vulgaris, throughout its life cycle was studied by conventional staining and histochemical techniques using lectins. The mantle, the arm and the two parts of the suckers: the infundibulum and the acetabulum were analysed independently. With the exception of the suckers, the general morphology of the epidermis does not vary from the first days post-hatching to adulthood. In general terms, histochemical techniques do not indicate changes in the composition of glycoconjugates of the epidermis main cells, epithelial and secretory cells. The epithelial cells of the mantle and arm show positivity for mannose (ConA+) in their apical portions, indicating the presence of n-glycoproteins that, among other things, provide lubrication to the surface of the body. In the suckers, the apical surface of the infundibulum contains sulphated glycosaminoglycans of the N-acetylglucosamine type that provide adhesive properties. In addition to observing three types of mucocytes, m1 and m2 are characteristic of the mantle and arm, and m3 is found in the suckers. The paralarva epidermis is characterised by the presence of Kölliker's organs whose exact function is unknown. In this study, the absence of staining with alcian blue/periodic acid–Schiff(AB/PAS) prevents the possibility of attributing a secretory function. Nevertheless, the linkage of three lectins (WGA, LEL and GSL-I) in the fascicle of the organ suggests the presence of proteoglycans rich in N-acetylglucosamine that would mainly have a structural role.