搜索结果: 1-15 共查到“DDT”相关记录38条 . 查询时间(0.125 秒)
抗战胜利后DDT在中国的应用
抗战胜利 DDT 双对氯苯基三氯乙烷
2024/4/7
20世纪30年代，DDT强大的杀虫功效被发现。抗战胜利后，DDT进入中国，在防疫和农业领域发挥了一定作用。在国民政府行政院善后救济总署和各大城市卫生部门的主导下，DDT被用于卫生防疫，一些地方当局在农业灾情严重时也曾使用过少量DDT，均取得了一定成效。由于DDT主要依靠进口，量少价高，且用法相对复杂，直至中华人民共和国成立前，其并未得到大规模应用。解放后，DDT一度成为最广泛使用的农药之一，但其危...
p,p′-DDT对乳腺癌细胞MCF-7黏附能力及黏附分子的影响
p,p′-DDT MCF-7 细胞间黏附 细胞与基质间黏附
2020/12/11
探讨有机氯残留物有效成分p,p′-DDT对乳腺癌细胞MCF-7黏附能力及黏附分子的影响。方法将10-7mol/L的p,p′-DDT作用于MCF-748h后，分别采用细胞聚集试验和结晶紫染色法分析其对MCF-7细胞间黏附率和细胞与基质间黏附率的影响，并采用RT-qPCR法和Westernblot法检测MCF-7中钙黏附蛋白E（E-cadherin）和CD29mRNA和蛋白表达水平。
Scientists Discover More Effective,and Potentially Safer,Crystalized Form of DDT
Scientists More Effective Potentially Safer Crystalized DDT
2017/7/21
A team of scientists has discovered a new crystal form of DDT that is more effective against insects than the existing one. Its research, which appears in the journal Angewandte Chemie, points to the ...
Variations in environmental contamination by polychlorinated biphenyls (PCB) and chlorinated pesticides (Lindane, DDT) on ping farms in Hodonín district in 1994 to 1999
pig farms polychlorinated biphenyls lindane DDT feed mixtures drinking water dust sediments pork sources health
2015/1/26
Environmental samples (n = 216) were collected at regular intervals from 1994 to 1999 on three pig farms (D., M., T.) in the area of the district town of Hodonín, Czech Republic. The samples of feed m...
Polygenic Resistance In The Highly DDT-resistant 91-R Strain Of Drosophila Melanogaster Involves Decreased Penetration, Increased Metabolism And Direct Excretion Of DDT
Resistance Metabolism P-glycoprotein
2014/10/21
Resistance to dichlorodiphenyltrichloroethane (DDT) in the 91-R strain of Drosophila melanogaster is extremely high compared to the susceptible Canton-S strain (>1500 times). Oxidative detoxification ...
2,4’-DDT对斑马鱼生长、繁殖力及卵黄蛋白原的影响
２，４ 滴滴涕 斑马鱼 卵黄蛋白原（Ｖｔｇ） 激素效应
2013/1/6
以斑马鱼体内卵黄蛋白原（Ｖｔｇ）作为雌激素污染物的生物标志物，比较研究了不同浓度２，４′ＤＤＴ对成年斑马鱼生长、发育、繁殖以及体内Ｖｔｇ含量的影响。结果表明，当水环境中ρ（２，４′ＤＤＴ）为２和１０μｇ·Ｌ－１时，斑马鱼产卵量和受精率与空白和溶剂对照组相比均显著下降（Ｐ＜００５）。当水环境中ρ（２，４′ＤＤＴ）为０２、２和１０μｇ·Ｌ－１时，斑马鱼肝脏指数与空白和溶剂对照组相比显著升高（Ｐ＜０...
本发明涉及一种修复DDT重污染场地土壤的联合处理技术。具体地说，本发明是一种将热洗脱与多相催化加氢相结合的联合处理技术；采用有机溶剂将DDT从受其污染土壤中洗脱出来，然后通过多相催化加氢将DDT转化为毒性较低，易被生物降解的物质。热洗脱方法采用有机溶剂洗脱，洗脱温度控制在50~100℃；而多相催化还原采用负载型贵金属催化剂，用氢气作为氢源，在碱存在下对液相中的土壤洗脱物DDT进行加氢脱氯，反应压力...
2,4’-DDT对斑马鱼生长、繁殖力及卵黄蛋白原的影响
2,4′-滴滴涕 斑马鱼 卵黄蛋白原 激素效应
2013/8/13
以斑马鱼体内卵黄蛋白原（Vtg）作为雌激素污染物的生物标志物，比较研究了不同浓度2,4′-DDT对成年斑马鱼生长、发育、繁殖以及体内Vtg含量的影响。结果表明，当水环境中ρ（2,4′-DDT）为2和10 μg·L-1时，斑马鱼产卵量和受精率与空白和溶剂对照组相比均显著下降（P＜0.05）。当水环境中ρ（2,4′-DDT）为0.2、2和10 μg·L-1时，斑马鱼肝脏指数与空白和溶剂对照组相比显著升...
基于DDT方法的自适应总体最小二乘算法收敛性分析
总体最小二乘 最小主元分析 确定离散时间
2014/9/18
针对确定连续时间(DCT) 方法在研究最小主元分析(MCA) 学习算法时, 存在严格限制条件而较难实现的问题, 基于确定离散时间(DDT) 方法, 研究了AMEX MCA学习算法的收敛条件. 理论分析表明, 只有在算法的学习因子和输入信号的自相关矩阵满足一定条件时, AMEX MCA学习算法才能收敛到系统的总体最小二乘解. 最后, 仿真结果表明了收敛条件的正确性.
STUDIES ON THE IRRITABILITY OF A FIELD POPULATION OF ANOPHELES MACULIPENNIS AND ANOPHELES SUPERPICTUS TO DDT
THE IRRITABILITY OF A FIELD POPULATION ANOPHELES MACULIPENNIS AND ANOPHELES SUPERPICTUS DDT
2010/2/3
A series of DDT irritability tests with adult A. maculipennis typicus and A. superpictus were carried out in the Isfahan area in August-September, 1970. The observations on irritability were measured ...
GENETICS AND MECHANISM OF MALATHION RESISTANCE IN ANOPHELES STEPHENSI FROM BANDAR-ABBAS AND ITS CROSS RESISTANCE SPECTRUM TO DDT,DIELDRIN AND PIRIMIPHOS-METHYL
Synergiat Cross and Back-Cross
2009/12/30
The genetics and mechanism of malathion resistance in the adults of An. stephensi (BAN-S), Was studied. Nine successive generations of malathion selection in the adults resulted in an increase in LTSO...
SUSCEPTIBILITY STATUS OF PHLEBOTOMUS PAPATASI TO DDT IN THE MOST IMPORTANT FOCUS OF ZOONOTIC CUTANEOUS LEISHMANIASIS,ISFAHAN PROVINCE,IRAN
DDT CUTANEOUS LEISHMANIASIS IRAN
2009/12/29
With regard to the importance of determining the susceptibility level of sandflies to insecticides in control operations especially in leishmaniasis foci, the susceptibility status of P.papatasi colle...
"LABORATORY EXPERIMENTS ON THE IRRITABILITY OF ANOPHELES ATROPARVUS AND ANOPHELES STEPHENSI TO DDT
Anopheles atroparvus Irritability to DDT
2009/12/29
Two strains of Anopheles atroparvus, one resistant and another sceptible to DDT and two of Anopheles stephensi, one resistant and one susceptible to DDT were tested for their irritability to DDT. Vari...
［目的］测定鱼腥草中重金属As、Hg以及666、DDT农药残留的含量，比较不同鱼腥草资源间在相同栽培条件下对其积累的差异。［方法］采用海光AFS3000型双道原子荧光光度计测定As和Hg含量；采用岛津GC9A型气相色谱仪，按GB/T145512003测定666和DDT的含量。［结果］鱼腥草幼嫩地上部分中As平均含量为0.161 mg/kg，Hg平均含量为0.004 mg/kg，地下部分中两者...