聚丙烯酰胺防治坡地水土流失田间试验研究   总被引：14，自引：1，他引：13  

杜尧东  夏海江 《水土保持学报》2000,14(3):10-13

坡地篱用聚丙烯酰胺可以减少地表径流,提高土壤含水量,促进土壤沉降,增强土壤结构性和水稳性,因而提高了土壤的持水性和抗蚀性,减少了土壤侵蚀量和肥力流失量,有利于作物增产。施用聚丙烯酰胺可使产量增加１８．７％～３２．４％。施用聚丙烯酰胺对环境无不良影响,而且投入费用较低,是一条值得探索的防治坡地水土流失的新途径。  相似文献   

Use of cassava as an energy source in a pelleted feed for the tilapia, Oreochromis niloticus L.     

K. L. WEE  L. T. NG 《Aquaculture Research》1986,17(2):129-138

Abstract. An assessment of the nutritive value of cassava as an energy source in a pelleted lilapia diet was carried out. Four isonitrogeneous diets containing 15%. 30%, 45% and 60% cassava were formulated and fed to groups of Ortochromis niloucus L for 10 weeks. Good growth and food utilization efficiencies were obtained with all diets: there was a trend of improved growth and food utilization with increased cassava incorporation in the diet although there were no significant differences (P < 0–05) in food conversion ratio, protein efficiency ratio or apparent net protein utilization between the experimental diets. No nutritionally related pathology was observed in fish fed high cassava levels. Increased incorporation of cassava led to an increase in the carcass fat content although it was within the acceptable limits for tilapia. Phytoplankton growth occurred in all experimental tanks due to the fertilization effects of uneaten feeds and faeces as the water within the experimental lankiyuem was not exchanged: the contribution of phytoplankton to the nutrition of the experimental fish was not quantified but was considered to be minimal since the phytoplankton biomass was approximately an order of magnitude less than in fertilized systems.  相似文献   

Normal expression of adhalin and merosin in ovine congenital progressive muscular dystrophy     

RD JOHNSEN  NG LAING  CR HUXTABLE  BA KAKULAS 《Australian veterinary journal》1997,75(3):215-216

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Superoxide production by stimulated equine polymorphonuclear leukocytes-inhibition by anti-inflammatory drugs     

D. E. AUER  J. C. NG  A. A. SEAWRIGHT 《Journal of veterinary pharmacology and therapeutics》1990,13(1):59-66

Polymorphonuclear leukocytes (PMNLs) were isolated from an inflammatory exudate induced in the intercarpal joints of horses by an administration of carrageenin. Their superoxide production at rest and following stimulation with either serum-treated zymosan (STZ) or phorbol myristate acetate (PMA) was measured by cytochrome-c reduction. Stimulation of the cells increased the cytochrome-c reduction 10-15 times that of resting cells. The maxima were 20 nmol of reduced cytochrome-c per 10(6) cells per ml at 120 min (STZ) and 35 nmol of reduced cytochrome-c per 10(6) cells per ml at 60 min (PMA). The maximum inhibition of the cytochrome-c reduction by superoxide dismutase (Palosein) was 83.6% (STZ stimulation) and 72.1% (PMA stimulation). The non-steroidal anti-inflammatory drugs, phenylbutazone, salicylic acid, aspirin, sodium salicylate in addition to D-penicillamine and dimethylsulfoxide caused dose-dependent inhibition of the cytochrome-c reduction when the cells were stimulated by PMA. The maximum inhibitions were 64% and 36% for aspirin (10(-2) M), 32% and 17% for phenylbutazone (10(-3) M), 15% and 31% for dimethylsulfoxide (6.4 x 10(-1) M), 32% and 19% for salicylic acid (10(-2) M), 0% and 17% for sodium salicylate (10(-2) M) and 2.2% and 2.5% for D-penicillamine (10(-4) M) when the cells were stimulated by STZ and PMA, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

百合无病毒苗快速繁殖技术   总被引：3，自引：0，他引：3  

张建华  庄天明  陈银华 《上海交通大学学报(农业科学版)》2006,24(4):370-373

以东方百合珠芽作为外植体进行脱毒苗的组织培养快速繁殖技术的研究,结果表明诱导愈伤组织的最适培养基为MS附加BA0.5mg·L-1和NAA0.1mg·L-1,培养7d后愈伤组织就启动,愈伤组织的诱导率达到90.5%;最适宜分化的培养基为MS BA1.5mg·L-1 KT0.1mg·L-1 NAA0.1mg·L-1,培养8d即开始分化出丛状芽,分化率可达到93.33%;最适宜芽增殖培养基为MS附加BA0.5mg·L-1和NAA0.05mg·L-1,繁殖系数达到5.4;无根苗转入1/2MS IAA1.0mg·L-1,100%生根;经检测,0.3～0.8mm的外植体,均能达到脱毒的要求。  相似文献   

瘤胃稳定性脂肪对产后奶牛奶产量、牛奶成份和外周血白细胞数量的影响     

张克春  谭勋  王小龙 《上海交通大学学报(农业科学版)》2006,24(4):345-348

选择经产、胎次相同和产奶量相近的荷斯坦奶牛40头,配对分组设计分为对照组和试验组,每组20头。对照组全程饲喂基础日粮,试验组饲喂基础日粮 瘤胃稳定性脂肪。结果:瘤胃稳定性脂肪对奶牛采食量无显著影响(P>0.05);试验组牛产奶量显著升高(P<0.05),乳脂率呈上升趋势(P>0.05),但乳蛋白率未见显著变化(P>0.05);试验组奶牛外周血白细胞总数和淋巴细胞数轻度上升(P>0.05),牛奶SCC呈下降趋势(P>0.05)。结果表明,补充瘤胃稳定性脂肪可提高产奶量,对于改善机体免疫机能有一定的作用。  相似文献   

‘桂热杧82号’花期短截花枝试验     

陈千付  韦淑丹  钟勇  黄杰  王烨熔  黄慧俐  杨谨瑛  蒋强  曹元鑫 《中国热带农业》2021,(2):61-64,48

为延迟‘桂热杧82号’采收期,提高杧果种植效益,对‘桂热杧82号’在不同花期进行短截花枝处理试验。结果表明,在原生花序初花期、盛花期短截花枝并配套相应的栽培技术,‘桂热杧82号’均易抽出再生花序,再生花序盛花期较对照分别推迟约30~35d、40~50d,采收期较对照分别推迟约30d、40d,且产量较对照显著增加,分别是对照的1.63倍、2.25倍;有胚果数量较对照明显增多,分别是对照的1.39倍、2.25倍;采收期果实品质与对照无明显差异。原生花序初花期、盛花期短截花枝是推迟‘桂热杧82号’上市的有效措施。  相似文献   

Strong synergistic activity and egg hatch inhibition by (E,E)-2,4-decadienal and (E)-2-decenal in Meloidogyne species     

Nikoletta Ntalli  Chrisostomos Oplos  Michalis Michailidis  Athanasios Thanasenaris  Dorothea Kontea  Pierluigi Caboni  Nikolaos G. Tsiropoulos  Urania Menkissoglu-Spiroudi  Zbigniew Adamski 《Journal of pest science》2016,89(2):565-579

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基于PCA的新疆生产建设兵团城镇化评价指标体系的构建     

郭丽峰  张吉林  陈小丽 《安徽农业科学》2016,(28)

结合新疆生产建设兵团城镇化建设自身特点,将生态环境指标和社会稳定指标作为重要的考核因素,形成一种全方位的城镇化综合评价因子。以《新疆生产建设兵团统计年鉴2014》中兵团14个师的数据为例,运用PCA方法,将影响评价兵团城镇化发展水平的20个主要因子,分为社会发展、经济建设、基础建设、社会稳定和生态环境5个方面,构建了兵团城镇化发展的新型评价指标体系。  相似文献   

高寒草甸草地水、土、草中氮硫含量冷暖季节的变化   总被引：3，自引：0，他引：3  

罗海玲  黄有德  张尤嘉  张英俊  颜生林  肖西山  李成魁  王玲英  王芳霞 《草业科学》2001,18(4):39-42,45

根据青海高原特殊的气候分布特征，把高寒草甸草地绵羊放牧地划分为冷季和暖季。通过测定冷暖绵羊放牧地水、土壤、牧草中氮和硫含量的结果表明：水、土壤、牧草中氮和硫的含量暖季＞冷季（P＜0．05），其中地表水冷季含硫量分别为3．7mg/kg、5.1mg/kg，水中没有检测到氮；牧草中硫含量冷暖季分别为2952mg/kg,3262mg/kg，差异显著（P＜0．05）；牧草中氮含量冷暖季分别为0．62％、1．36％，差异显著（P＜0．05）；土壤氮含量冷暖季分别为0．22％、0．285％，差异显著（P＜0．05）；硫含量冷暖季分别为0．24％、0．37％。  相似文献