新中国成立后木结构建筑的发展概况     

赵越  杨春梅  齐英杰  杨成志 《林业机械与木工设备》2012,(5):10-12,16

从科学发展观的角度回顾了新中国成立后木结构建筑的发展概况。  相似文献   

农科院所提高科技服务能力的几点建议   总被引：1，自引：0，他引：1  

王秀全  张志扬  祁栋灵  高宏华 《热带农业工程》2010,(6)

农科院所提升科技服务能力是科学技术转化为生产力的重要环节,针对当前农科院所科技服务中存在的问题,提出了建立健全组织领导机构,建设专家库,成立专职服务机构;完善科技服务激励机制;加强与地方和企业、专业合作社等的合作;多种模式并举;利用信息网络,营造学科技、用科技的氛围;建立试验示范基地等举措提高科技服务能力。  相似文献   

棉田使用氰戊菊酯与棉蚜再猖獗   总被引：1，自引：0，他引：1  

顾中言  韩丽娟 《昆虫天敌》1994,16(2):77-79

氰戊菊酯的复配剂－丰收菊酯，对棉田天敌和棉蚜均有极强的杀伤力，从而同时将它们降到低水平上，蚜量显著小于对照。对照区没有药剂的控蚜作用，但在于敌作用下，蚜量上升后又下降，没能形成很大的群体。由于抗药性的发展，氰戊菊酯已不能控制棉蚜数量，又对棉田主要天敌有极强的杀伤力，以致使用后棉蚜在不能被药剂杀死的同时也推动了天敌的控制，造成再猖獗。  相似文献   

诱导疫霉菌产生游动孢子囊液体培养基的研制   总被引：7，自引：0，他引：7       下载免费PDF全文

陈方新  齐永霞  高智谋  潘月敏  曹君  徐仁玉 《植物保护》2005,31(2):34-37

研制了几种诱导疫霉菌产生游动孢子囊的蔬菜汁混合培养液,测定了各培养液诱导苎麻疫霉游动孢子囊的效果以及其对苎麻疫霉菌游动孢囊产生量、形态特征、游动孢子释放、卵孢子产生量、卵孢子的形态、菌丝生长和菌落形态等生物学性状的影响。试验结果显示,各配比培养液均能很好地诱导游动孢子囊的产生,且以较低浓度的培养液对孢子囊诱导效果较好,而高浓度则有利于卵孢子的产生,不同培养液中产生的游动孢子囊均能正常释放游动孢子。其中西红柿∶黄瓜=1∶2配比的培养液简单易行且诱导效果最好,是V₈C的理想替代培养液。  相似文献   

Effect of glycine on body weight and lipid metabolism in mice     

LIU Jing  LU Da-xiang  WANG Hua-dong  QI Ren-bin  FU Yong-mei  WANG Yan-ping 《园艺学报》2005,21(6):1143-1146

AIM: To study the effect of glycine on body weight and lipid metabolism in mice. METHODS: Mice were randomly divided into four groups, control, high-fat diet group (HF), glycine group (Gly), and glycine treatment group (Gly+HF). The mice were fed with normal diet and high-fat diet for 12 days, respectively, and then were treated with glycine solution by intraperitoneal injection. Finally, the serum was collected to measure serum lipid, epididymal fat-pads, pararenal fat-pads and abdominal fat-pads were taken out to weight. Moreover, pathologic changes in liver were observed. RESULTS: The body weight of HF group was obviously lower than that in control; the body weight and adipose tissue content of Gly group were obviously lower than those in control; the body weight and adipose tissue content of Gly+HF group were obviously lower than those in HF group; the levels of TC and TG in Gly group were obviously lower than those in control; there was no statistical difference in serum lipid between Gly+HF and HF groups. In addition, marked hepatic steatosis in HF group, and slight hepatic steatosis in Gly+HF group were found. CONCLUSION: Gly can decrease the body weight and adipose tissue content and serum lipid in normal diet and high-fat diet mice, and it also can prevent hepatic steatosis.  相似文献   

新疆草地生态安全问题、现状与对策分析   总被引：13，自引：3，他引：13  

赵万羽  李建龙  齐家国  刘旭 《干旱区研究》2005,22(1):45-50

简要介绍新疆草地生态问题的由来及现状，运用新的生态安全理论分析新疆草地生态安全时空特征，指出新疆草地生态安全问题是长期人地矛盾不断尖锐与发展演变而来。人口膨胀引起的资源环境破坏、超载过牧造成对资源的掠夺经营等，使草地稳定自协调机制破坏，草地自然生态系统由稳定走向严重危机，并引发新的牧业危机。分析指出，实现人地关系的和谐，需综合考虑生态、经济、社会历史等方面的因素。其中，绿洲区牧民定居点的综合发展水平是维护草地生态安全、实现牧业可持续发展的关键。实现生态安全与可持续发展的主要对策有：依法监理草地放牧状况、合理利用、改良与保护天然草地、高效经营人工草料基地、提高畜牧业经营水平等。依托的关键技术有：草地资源监测技术、退化草地治理及草地利用实用技术等。  相似文献   

不同生境中稻飞虱种群动态研究   总被引：6，自引：0，他引：6  

顾中言  韩丽娟  黄祥麟  王强  许小龙  花家绿  金丹  严大富 《植物保护学报》1996,23(2):170-174

菊酯类农药对水稻螟虫有优异的防治效果,但引起稻飞虱的更大发生。作者用溴氰菊酯、氰戊菊酯及对稻飞虱高效的噻嗪酮等杀虫剂和对稻飞虱不同抗感水平的水稻品种组成不同的化学、品种环境,系统观察稻飞虱种群动态差异。结果表明,同一水稻品种,不同农药,稻飞虱种群增长量不一样。同一农药,不同水稻品种,稻飞虱的发生亦不同。溴氰菊酯或氰戊菊酯用到感虫品种上,有利因子重叠,稻飞虱的发生量最大;用到中抗品种上,有利因子与不利因子重叠,有效地抑制稻飞虱种群的增长。先将溴氰菊酯喷洒到感虫品种上,10天后再用噻嗪酮,两个有利因子重叠后再加一不利因子,仍可控制稻飞虱的为害。  相似文献   

马铃薯纺锤块茎类病毒的检测和防治   总被引：5，自引：1，他引：5  

崔荣昌  李芝芳  李晓龙  王国学 《植物保护学报》1992,19(3):263-269

马铃薯纺锤块茎类病毒病(potato spindle tuber viroid,PSTVd)是一种严重为害马铃薯生产的病害,降低产量20%—30%。防治的主要措施是应用无类病毒的种薯。由于目前还没有脱掉类病毒的有效措施,只能从未被饱和侵染的群体中鉴定筛选出未被侵染的个体,再脱掉其它病毒,作为核心繁殖材料。1987年以来,利用自制的电泳设备,以往复聚丙烯酰胺凝胶电泳法(return-polyacrylamide gel electrophoresis,R-PAGE)检测类病毒,筛选出未感病的个体,再用茎尖组织培养法脱掉其它病毒。经用马铃薯卷叶病毒等8种病毒酶标抗体鉴定筛选,获得既无类病毒也无主要马铃薯病毒的克新1、2、3和4号等主栽马铃薯品种的核心种。并已提供给省内外的良种场繁殖推广。1989和1990年抽样检测克山良种场繁殖的原种、一级和二级良种,未检测到类病毒。  相似文献   

电力企业改革与政府管制     

祁顺生 《湖南农业大学学报(自然科学版)》2002,(4)

从电力企业自然垄断的客观规律性及所产生的问题分析入手,对我国电力企业的产业化分割和政府管制进行研究.研究认为 ,建立有序的市场和充满活力的经济,就必须对"电力生产企业"实施电价规制,处理好电力企业改革与政府管制的关系问题.  相似文献   

Effect of L-NAME on pulmonary arterial pressure,plasma nitric oxide and pulmonary hypertension syndrome morbidity in broilers   总被引：4，自引：0，他引：4  

Wang J  Wang X  Xiang R  Sun W 《British poultry science》2002,43(4):615-620

1. Experiments were conducted to evaluate the effect of a synthetic inhibitor of nitric oxide (NO) synthase (L-NAME) on pulmonary arterial pressure (PAP) and pulmonary hypertension syndrome (PHS) morbidity in broilers. 2. In Experiment 1, broilers were infused intravenously with L-NAME, and the mean pulmonary arterial pressure (mean PAP) and plasma NO were measured at 0, 1, 2 and 4 h after the start of infusion. The mean PAP increased and plasma NO was reduced at 1 to 2 h in broilers treated with L-NAME. 3. In Experiment 2, 180 Arbor Acres broilers were evenly divided into three groups: a control group (group C), and two groups exposed to low environmental temperatures and fed a 3, 3, 5-triiodothyronine (T3) supplemented diet alone (group A) or also including 100 ppm L-NAME (group B). 4. The PHS morbidity of group A was higher than for group C but lower than for group B. Plasma endothelin-1 was higher in broilers in groups A and B than in group C. Plasma NO was not significantly lower in broilers of group B when compared with those in group A. 5. The right/total ventricular weight ratio (RV/TV) and mean PAP were higher in groups A and B than in group C, and the RV/TV ratio increased one week earlier in group B than in group A. 6. These results suggest that L-NAME increases broiler PAP by inhibiting the endogenous synthesis of NO, leading to pulmonary hypertension, right ventricular hypertrophy and the increased morbidity of PHS in broilers.  相似文献