甜瓜新品种-中甜1号的选育

中甜1号为优质、高产、耐湿、早熟厚皮甜瓜品种,果实发育期25-28d,果实椭圆形,果皮黄色,上有10条银白色纵沟,果肉白色,单瓜重1.0-1.5kg,可溶性固形物含量13.5%-15.5%。适应性广,在保护地、露地条件下均可栽培。     

破壁蜂花粉对蛋鸡免疫功能及肠道菌群的影响

试验将槐花蜂花粉进行振动磨超微粉碎破壁,分别按1 g/kg、5 g/kg、10 g/kg三个不同剂量混到蛋鸡饲料中,从7日龄开始饲喂至50日龄,每个剂量分两个试验,试验一用新城疫Ⅳ系疫苗免疫雏鸡,利用β-微量法监测血清中的血凝抑制抗体效价的动态变化;试验二用大肠杆菌油乳苗免疫雏鸡,利用间接血凝法监测血清中大肠杆菌抗体效价的动态变化。分别定期称重捕杀取脾、胸腺、法氏囊,计算免疫器官指数,取肠道内容物计数大肠杆菌和乳酸菌,测定肠道内pH值。结果表明,不同剂量的破壁蜂花粉均能不同程度地提高病毒抗原性抗体效价和菌体抗原性抗体效价,对雏鸡免疫器官的发育以及肠道内环境、菌群的平衡也有一定影响。     

塔里木河流域生态环境恶化的水文效应

塔里木河是我国最大的内陆河。 4条源流出山口多年平均天然径流量 2 2 4 .9× 10 8m3 (195 7～ 2 0 0 1年 )。在全球变暖的大背景下 ,塔里木河流域山区气候出现变暖增湿的趋势 ,2 0世纪 90年代径流量达 2 4 1.9× 10 8m3 ,增幅 7.6 %。由于源流区人类开发利用水资源的影响 ,使得补给塔里木河干流的水量不断减少 ,水文条件改变 ,造成干流上、中游段耗水严重 ,导致下游生态与环境急剧退化。自 2 0 0 0年以来 ,实施的从开都河—博斯腾湖向下游绿色走廊应急输水 ,已使下游生态环境开始恢复生机。     

The mechanisms of pathophysiological vasodilation or vascular hyporesponse

In some pathophysiological processes such as severe shock, the patients and animal experimental models fail to respond to pressor medicine. Vascular hyporesponse or vasodilation is one of the key problems in treatment of these patents. Although considerable progress had been made in recent years, the precise mechanisms of vascular contractile hyporeactivity have not been completely elucidated. A number of studies indicate that vascular hyporesponse or vasodilation correlate with many factors. In this review, the possible mechanisms about vascular hyporesponse or vasodilation during shock and other pathphysiolgoical processes were discussed.     

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.     

组氨醇脱氢酶抑制剂的研究动态

组氨醇脱氢酶(HDH)是组氨酸生物合成过程中最后两步反应的催化酶。对组氨醇脱氢酶的结构、催化机理、组氨醇脱氢酶抑制剂等方面的研究动态进行了较为详细的综述。     

十种常用农药与球孢白僵菌的生物学相容性

球孢白僵菌孢子粉与10种常用农药相容性的测定结果显示,随着孢子浓度上升,所试农药对孢子的抑制作用均有不同程度的增强。在1/10田间常规使用浓度下,百菌清和代森锰锌均能抑制或杀死孢子(萌发率<1％)。除阿维菌素外,所有杀虫剂均与白僵菌孢子相容,在常规使用浓度的10倍稀释液中孢子萌发率达90％以上。吡虫啉、蚜虱灵、灭多威和氟虫腈与孢子的相容性最好,其中吡虫啉和蚜虱灵对孢子萌发率的影响不明显随药剂浓度的变化而变化,即使在田间常规使用浓度下孢子萌发率也在95％以上,而阿维菌素与白僵菌的相容性极差。因此,应用白僵菌制剂防治害虫,选择生物学相容性好的农药以低剂量与白僵菌制剂混用,既可使菌剂增效,又可大幅度降低化学药剂用量。     

变叶海棠种群多样性的形成与分化研究

 采用杂种指数和形象化散点图法, 探明了变叶海棠以兼性无融合生殖方式与陇东海棠和花叶海棠产生渗入杂交变异, 又以无融合生殖方式保持新产生变异的遗传, 经过数千万年的世代繁衍,形成现今这样极其复杂多样的渗入杂交群体, 该群体为3 个种的杂交复合体。由于杂种的全部或部分能育子代中发生的基因重组和增加基因的突变, 丰富了物种的基因库, 从而深入的揭示了变叶海棠具有多种高抗性的遗传机理。在变叶海棠居群内保护或栽植适量的陇东海棠和花叶海棠, 对于保持和促进变叶海棠多样性的形成与分化具有重要意义。