地被菊花粉萌发及花粉活力的研究

用ME的盐类和维生素附加16％聚乙二醇4000(PEG4000)和15％蔗糖对野菊及新红、塞旗红、玫瑰红的花粉进行培养。结果表明，萌发率分别为80．2％、85．3％、61．3％和46．5％。PE‰对菊花萌发有明显促进作用。但庶糖的作用不能被PEG所取代。菊花花粉萌发较合适的温度为10-20℃，在4-8℃时，萌发率及速度迅速降低，35℃萌发虽快。但花粉管短且破裂。在4℃条件下花粉可贮藏4-14d。但不宜干燥贮藏。     

城镇化水平计算方法比较分析

城镇化是社会经济发展的必然趋势，与小城镇人口、经济实力、社会发展和环境保护等方面密切相关。城镇化判别指标归纳起来分两大类：一类是单一指标法或称主要指标法；另一类是多项指标法、复合指标法或称综合指标法。在常用的、单一指标法的城镇化水平计算方法中，城镇人口比重指标法和带眷系数法两种方法能够比较准确地反映小城镇的城镇化水平，尤其以城镇人口比重指标法计算结果最符合实际。     

一种沼液冲厕装置

目前农村所建户用沼气池基本上都是厕所、猪圈、沼气池三结合,人畜粪便虽能自流入池,但厕所常有积便,每到夏季蝇蛆滋生,既不卫生,又易传播疾病,要保持厕所卫生就必须经常冲洗.     

高校图书馆电子阅览室管理和服务

本文介绍湖南科技大学图书馆电子阅览室管理现状与管理系统,探讨高校图书馆电子阅览室的软、硬件的管理维护,推行读者柔性管理和开展电子阅览室特色服务的途径。     

母猪饲料中添加中药“泻康宁”对仔猪黄白痢的治疗试验

由埃希氏大肠杆菌引起的仔猪黄白痢会导致机体水分和电解质大量丧失 ,使机体衰弱甚至死亡 ,从而造成很大的经济损失。目前 ,大肠杆菌引起的仔猪黄白痢已成为影响仔猪发育和育成的重要疾病之一 ,成为养猪业的一大障碍。虽然应用抗生素、磺胺类药物和抗菌增效剂等治疗仔猪黄白痢有一定的疗效 ,但由于大肠杆菌具有很强的变异性 ,易产生抗药性而影响治疗效果 ,而且 ,有的药物还会在体内蓄积 ,给人类的健康带来危害 ,正因为如此 ,人们开始寻找新的无公害的药物。实验研究发现 ,中草药不仅能够促进畜禽生长发育和提高生产性能 ,调节动物机体的新陈…     

农机安全管理体制的变革和构想

结合《中华人民共和国道路交通安全法》有关规定和黑龙江省农机安全管理的实践,总结了农机安全管理体制焦点问题和体制的变革,并对实施道路交通安全法提出设想和建议。     

供水工程影响下中国北方地区耕地后备资源开发潜力

灌溉水源是北方地区耕地后备资源能否有效开发的关键。当前,中国正在推动国家水网工程规划建设,为北方地区耕地后备资源开发提供了新的机遇。在以往研究基础上,该研究考虑北方地区已建、在建及规划的供水工程,基于自然适宜、利用高效、发展稳定三方面评价准则,结合三维魔方空间分类方法,开展了雨养情景和供水灌溉情景下耕地后备资源开发潜力分析。结果表明：雨养农业情景下,北方地区勉强适宜（Ⅱ级）、中度（Ⅲ级）和高度（Ⅳ级）适宜的耕地后备资源面积分别为2.9万、1.0万和0.6万km²。灌溉农业情景下,耕地后备资源面积明显增加,勉强适宜（Ⅱ级）、中度（Ⅲ级）和高度（Ⅳ级）适宜的耕地后备资源面积将分别达到5.4万、7.6万和6.5万km²,主要集中于新疆、内蒙古和甘肃3省（自治区）。该研究结果可为中国耕地后备资源开发利用及国家水网工程效益发挥提供参考。     

Bone marrow-derived stromal cells and cartilage tissue engineering

Articular cartilage repair is one of the most challenging issues which remains to be resolved in clinic work. Discovering of bone marrow stromal cells (BMSC) and its application in tissue engineering provide new methods for the treatment of cartilage defects. High seeding density, appropriate cytokines and three-dimensional culture play important roles in the process of inducing BMSC differentiating into chondrocytes, suitable scaffold is also essential in reconstructing cartilage in vitro by methods of tissue engineering.     

Effects of FK506 on anti-glomerular basement membrane nephritis in rats

AIM:To investigate the effects of FK506 on anti-glomerular basement membrane(GBM) nephritis in rats. METHODS: Anti-GBM nephritis model was elaborated by rabbit anti-rat GBM antibody injection in SD rats in this study. The rats were divided into three groups: FK506 treated group(0.5 mg·kg^-1·d^-1, sc), untreated nephritis control group and normal control group. FK506 was administered daily six hours after injection of anti-GBM IgG. All the rats were observed urinary protein at the 4th day, the 14th day and the 21st day. At the same time, the kidney specimens were collected, and T cell transforming function was also monitored.RESULTS:Rats injected with rabbit anti-GBM Ab developed heavy proteinuria by 4 days, and serum creatinine and serum urea appeared which kept on the rising. Glmerular hypercellularity, crescents, and protein casts were observed in nephritic rats. By electron microscopy, the thickening of GBM and loss of foot processes were seen. T cell transforming function was higher than normal. But, all pathological changes obviously turned for the better in FK506 treated group. CONCLUSION:FK506 could inhibit the progression of rat anti-GBM nephritis.     

Effect of cilazapril on pulmonary vascular endothelial dysfunction in hypoxic rats

AIM:To study the effect of cilazapril on pulmonary vascular endothelial dysfunction in hypoxic rats. METHODS:The structure and function of endothelium in hypoxic rats were studied by biochemical analysis, radioimmunoassay, transmission electron microscope and correlated with hemodynamic. RESULTS:1) The change and damage of ultrastructure in endothelial cell (EC) were obsevered in hypoxic rats. 2) The contents of plasma nitric oxide (NO) and superoxide dismutase (SOD) activity in blood as well as endothelial nitric oxide synthase (eNOS) activity in the lung tissue were significantly lower in the hypoxic rat than those in contral animals. The concentrations of plasma endothelin-1(ET-1) and angiotensin converting enzyme(ACE) as well as malondialdehyde(MDA) were significantly higher in the hypoxic rat than these in contral animals. The relaxing and contracting factors had a significant positive/negative correlation with mean pulmonary artery pressure (mPAP). 3) Cilazapril significantly decreased the level of ET-1 and ACE and significantly increased the level of NO and activity of eNOS and SOD. At the same time, cilazapril extenuated hypoxia-induced injuries of EC. CONCLUSION:The results indicate that damaging structure and dysfunction of EC existes in hypoxic rats. The cilazapril effectively preventes and treates the chronic hypoxic PH by relieving the injury and improving secretion in EC.