Evaluating the ecotoxicological effects of Pb contamination on the resistance against Lymantria dispar in forest plant,Larix olgensis     

Dun Jiang  Ming‐tao Tan  Qi Wang  Gui‐rong Wang  Shan‐chun Yan 《Pest management science》2020,76(7):2490-2499

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铜对生长猪肝中IGF—Ⅰ基因mRNA表达的影响     

郑鑫刘国文  杨连玉李家奎夏清娟  郝德威王哲 《中国兽医科技》2006,36(6):497-501

采用生长试验、免疫放射分析和定量PCR方法，观察了生长猪血液中类胰岛素生长因子（IGF—Ⅰ）及其结合蛋白（IGFBP3）数量的变化和IGF—Ⅰ基因在肝中表达量的变化。结果显示，每1kg饲料中添加125-250mg铜，能够上调IGF-Ⅰ基因的表达量，显著提高猪的平均日增重，促进生长猪循环血液中IGF—Ⅰ浓度的增加。试验结果证实，铜是通过促进生长激素一胰岛素样生长因子轴相关因子的合成和分泌来发挥促生长作用的。  相似文献   

雏鸭铜中毒的实验观察   总被引：14，自引：4，他引：10  

崔恒敏  陈怀涛 《中国家禽》2003,25(11):8-10

1日龄天府肉鸭健雏210只随机分为三组,分别喂给铜12.16mg/kg(对照或1组)、850mg/kg(2组)和1050mg/kg(3组)日粮7周。结果表明,后两组雏鸭分别于3周龄和2周龄开始出现临床症状,生长发育迟缓,并出现死亡;血红蛋白含量和红细胞数量显著低于对照组(p<0.05),红细胞变形、变性,大小不等;血清铜含量和肝铜含量极显著高于对照组(p<0.01)。  相似文献   

日粮中添加铜对高产乳牛泌乳量影响的研究   总被引：3，自引：0，他引：3  

黄志秋  何学谦  刘利春  徐大勇  侯成万 《四川畜牧兽医》2001,28(11):22-22,24

本研究探索了在奶牛日粮中添加Cu++对其产奶性能的影响.结果表明,在日粮中添加Cu++ 7.6×10-6,牛奶的乳脂率和干物质含量并未降低,牛奶中铜的残留量低于国家规定标准,能使奶牛泌乳量增产7.66%～9.61%,从而增加乳牛业的经济效益.  相似文献   

A Prospective Study Of Intravenous Catheter Contamination     

Karol A. Mathews DVM  DVSc  Melanie J. Brooks RVT  Anne E. Valliant BSC 《Journal of Veterinary Emergency and Critical Care》1996,6(1):33-43

A one year prospective study was conducted to determine the association between intravenous catheter contamination and increased dwell time, and to identify any related risk factors. Intravenous catheters obtained from 23 cats and 98 dogs in the Intensive Care Unit at the Ontario Veterinary College with dwell times > 72 hours for the test group (n=58) and < 72 hours for a corresponding control group (n=63) were cultured between April 1991 and March 1992. One hundred and twenty one catheters were cultured, 16 jugular, 99 cephalic, and 6 saphenous. The overall contamination rate was 13 out of 121 catheters cultured (10.7%); 9/63 (14.3%) control and 4/58 (6.9%) test catheters. The bacteria isolated were E.aerogenes, S.aureus (3), P.aeruginosa, P.multocida, and Bacillus sp (7). The Bacillus sp positive catheters (5 control and 2 test) were placed during a five day period, and contaminated gauze squares were identified as the source of infection in these catheters. After these were removed from the study, the group infection rate was 6.9% control and 3.6% test. There was no significant difference between groups and no associated risk factors were identified. We conclude that intravenous dwell time need not be restricted to <72 hours.  相似文献   

梅州市五华县石灰岩矿区土壤铅污染现状研究及改良对策     

李冰  钟凤 《安徽农业科学》2009,(2):805-806

对梅州市五华县几个石灰岩矿区周边土壤中铅含量进行了测定，结果表明，污染土壤的铅含量远远超出了国家土壤环境质量三级标准（对土壤生态环境产生影响的最低浓度值），对生态产生影响。根据内梅罗污染指数评定得出，矿区土壤铅污染达到重污染的程度。提出了减轻铅污染对生态环境危害的控制污染源措施和改良对策。  相似文献   

降低人造板热压机液压系统油液污染的探讨     

丁勇义 《林业机械与木工设备》2001,29(7):20-22

车间粉尘与湖湿空气是人造板热压机液压系统油液外界污染的主要原因，通过构筑封闭式泵房，增设辅助油箱，改变没箱底部结构，设置排污，排水装置，可有效降低人造板热压机液压系统油液污染，改善液压系统性能，提高压机工作效率。  相似文献   

Movement of Xanthomonas campestris pv. vitians in the stems of lettuce and seed contamination     

J. D. Barak  S. T. Koike  R. L. Gilbertson † 《Plant pathology》2002,51(4):506-512

Xanthomonas campestris pv. vitians , the causal agent of bacterial leaf spot of lettuce (BLS), can be seedborne, but the mechanism by which the bacteria contaminates and/or infects lettuce seed is not known. In this study, the capacity of X. campestris pv. vitians to enter and translocate within the vascular system of lettuce plants was examined. The stems of 8- to 11-week-old lettuce plants were stab-inoculated, and movement of X. campestris pv. vitians was monitored at various intervals. At 4, 8, 12 and 16 h post-inoculation (hpi), X. campestris pv. vitians was recovered from 2 to 10 cm above (depending on stem length) and 2 cm below the inoculation site. Xanthomonas campestris pv. vitians was also recovered from surface-disinfested stem sections of spray-inoculated plants. Together, these results are consistent with X. campestris pv. vitians invading and moving systemically within the vascular system of lettuce plants. To investigate the mechanism of seed contamination, lettuce plants at the vegetative stage of growth were spray-inoculated with X. campestris pv. vitians and allowed to develop BLS. Seed collected from these plants had a 2% incidence of X. campestris pv. vitians external colonization, but no bacteria were recovered from within the seed.  相似文献   

Relationship between potato seed tuber contamination by Erwinia carotovora ssp. atroseptica, blackleg disease development and progeny tuber contamination     

I. K. Toth†  L. Sullivan  J. L. Brierley  A. O. Avrova  L. J. Hyman  M. Holeva  L. Broadfoot  M. C. M. Pérombelon  J. McNicol 《Plant pathology》2003,52(2):119-126

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Further suppression of<Emphasis Type="Italic">Botrytis cinerea</Emphasis> disease in cucumber seedlings by chitosan-copper complex as compared with chitosan alone     

N. Ben-Shalom  E. Fallik 《Phytoparasitica》2003,31(1):99-102

Chitosan-copper complex compared with chitosan alone enhanced suppression ofBotrytis cinerea rot development on four-true-leaf cucumber seedlings in controlled growth chambers. This paper constitutes the first report of such enhancement. The optimal concentrations for the most effective suppression ofBotrytis development were 0.2 gl ⁻¹ chitosan and 1.6 mmole copper. After 12 days’ incubation, marked and significantly better disease suppression was obtained with chitosan-copper complex (75% suppression) than with chitosan alone. The chitosan-copper complex could be a very promising decay control agent for use in both conventional and organic agriculture. http://www.phytoparasitica.org posting Dec. 18, 2002.  相似文献