The rapid and low cost capillary GC method was introduced for the determination of BHC and DDT pesticide residues in vegetables.
对蔬菜中六六六、滴滴涕残留量的快速、低成本检测方法进行了研究。
In 71 samples of 80 kinds of enterprises, products, tea in the BHC and DDT residues have been basically brought under control, but the sensory quality of tea and water is still more serious over the issue, individual products and even have odor, stain, mildew and other issues.
在71 80的企业，产品，六六六和滴滴涕的残留茶种样本已基本得到控制，但茶叶感官品质和水仍然是对这个问题更严重，个别产品甚至有异味，污点，霉菌和其他问题。
Organic chlorine farm chemicals: gammexane, heptachlor, DDT:(5) dioxin.
有机氯农药，包括六六六、七氯、DDT：（5）二恶英。
Thepressure history of the porous bed bottom was measured by use of a strain-compensated manganin gage.
利用测压系统对DDT流场尾部的压力进行了直接测试，得到了流场的压力波形及压力值。
The way he hangs around making inane conversation, the way he looks at you when he fingers his DDT can...
当他绕着弯子谈论空洞的话题，在他拨弄DDT 罐头时他盯着你的方式
This system was used to measure the flame propagation velocities along the tube, and furthermore to determine the DDT distance.
通过该系统测量爆震管中火焰传播速度的轴向分布，确定了爆燃到爆震的转捩距离。
It is verified by numerical simulations that the DDT-GC scheme is able to guarantee the quality of services, decrease the handoff dropping probability and forced termination probability, and improve the system resource utilization.
数值仿真结果表明，DDT-GC策略既保证了系统的服务质量，又有效地降低了系统的切换中断率和呼叫阻塞率，同时提高了系统资源的利用率。
It is verified by the numerical simulations that the DDT-GC scheme can provide the necessary service guarantee. At the same time, it can decrease the handoff dropping probability and forced termination probability, while improving the system resource utilization.
数值仿真结果表明，DDT-GC策略既保证了系统的服务质量，又极大地降低了系统的切换中断率和呼叫阻塞率，同时提高了系统资源的利用率。
Using a long-term reared housefly population which is very susceptible to pyrethroid insecticides as the susceptible strain, a population collected in 1993 in Shanghai and has been treaded by cyhalothrin as the resistant strain, we bioassayed their susceptibility to organophosphorus, carbamate, pyrethroid and organehloride insecticides. We also investigated the role of metabolic enzymes, i. e. esterase, GST, MFO and of target enzymes, i. e. AChE and 〓-ATPase in resistance to insecticides. Cyhalothrin resistance inheritance, the co-toxicity coefficient of cyhalothrin and methylene dithiocyanate was also studied. The insecticides resistance in adults and larvae of houseflies was compared and the mechanism of resistance differences between adults and larvae was discussed.
本文以采自野外并经过室内多代筛选的三氟氯氰菊酯抗性家蝇品系和室内多年饲养的敏感家蝇品系为试虫，测定了抗性家蝇品系和敏感家蝇品系对拟除虫菊酯杀虫剂三氟氯氰菊酯、氯菊酯、有机磷杀虫剂DDVP、氨基甲酸酯杀虫剂残杀威、有机氧杀虫剂DDT的抗性水平，并通过活体增效剂实验和离体生化实验研究了抗性品系的解毒酶和靶标酶的变化，本文还研究了三氟氯氰菊酯和增效剂I对抗性家蝇的增效作用及增效机理、家蝇幼虫和成虫对杀虫剂的抗性差异及其抗性差异的机理。
No significant impact was measured on growth of Gomphidius viscidus and Laccaria bicolor under the treatment of 5.0 mg/L DDT and on growth of Boletus edulis under the treatments of 5.0 mg/L and 25.0 mg/L DDT.
在25.0mg／L的DDT处理下，美味牛肝菌的生长没有受到显著影响，显示出了较好的耐受性，在高ρ处理下，铆钉菇的多酚氧化酶、漆酶和过氧化物酶活性显著增强，液体培养基pH下降幅度较大。
Boletus edulis, Gomphidius viscidus, Laccaria bicolor and Leccinum scabrum, growing in the media with different mass concentrations of DDT were studied in vitro.
结果表明：DDT没有影响外生菌根真菌的生长模式，只是改变了其生长速度和生物量积累。
However, their effects upon the rice leafhopper, Empoasca subrufa Melichar, remain to be carefully investigated. Experimentswith adults were conducted both in the laboratory and in the field. The resultsmay be summerized as follows:1.Spraying with 25% DDT emulsion in 200-300 parts of water killed over90% of the leafhoppers, whereas in 400 parts of water, it gave an unstable kill-ing effect ranging from 75% to 90%.Dus...
田间使用 DDT 防治白翅叶蝉的残效期约为10—12天。666单独用来防治白翅叶蝉效果甚差，但与 DDT 混合使用有增效作用，残效期与单独使用 DDT 相似；二者混用是最合理的施用方式，可以节省 DDT 用药量，减低药费，同时对多种稻虫可收综合防治之效。25%DDT 乳剂和6%可湿性666按1∶1∶400及1∶1∶600混用，其毒效相当于单用 DDT 1∶200及1∶300者；用1∶1∶500喷射效果比单用 DDT 1∶300者还略高；5% DDT 粉剂和0.5%666粉剂按1∶1混用，其毒效也和单用5% DDT 粉剂相接近。
DDT (dichlorodiphenyltrichloroethane):Synthetic insecticide belonging to the family of organic halogen s.
滴滴涕：二氯二苯基三氯乙烷：一种合成的有机卤素化物杀虫剂。
Objectives: Severe acute fetal distress is the most urgent event for the pregnant women in the delivery room, and the correct timing is most essential for the proper treatment. In this study, we approximated the critical time point (Distress-to-Delivery Time, DDT) between the finding of SAFD and the time of emergency delivery by screening the clinical data of patients with SAFD and investigated the prognostic factors for the patients, who received the emergency cesarean delivery.
目的：待产过程中发生急性胎心窘迫是产房最危急之事件，其救治时间更是分秒必争，因此，本研究希望藉由医院现有相关数据找出急性胎心窘迫救治中胎心窘迫至胎儿娩出时间链(Distress-to-Delivery Time，DDT)的关键时间点，并探讨影响罹患急性胎心窘迫施行紧急剖腹产之胎儿救治预后相关因素。
Among the special nine pollutants, however, eight of them, including Hexachlorobenzene, N-Nitrosodi-N-propylamine, 3, 3-dichlorobenzidine, 2, 4, 6-trichlorophenol, 2, 3, 4, 5, 6-pentachlorophenol, indeno (1, 2, 3-cd) pyrene, 4, 4'-DDT and Heptachlor were in need of concern while another chemical: dibenzanthracene be of special concern. The sources of these chemicals were discussed and some control strategies were suggested based on the risk assessment.
结果表明，有18种有机污染物超过了USEPA的标准浓度要求，其中9种物质具有一定的生态风险，其中六氯苯、N-亚硝基二正丙胺、3，3'-二氯联苯胺、2，4，6-三氯酚、五氯酚、茚并(1，2，3-cd)芘、4，4'-滴滴涕、七氯在内的8种化合物具有一定的风险，而多环芳烃二苯并蒽需要引起更高警惕；在此基础上探讨了这些化合物的来源及作用，并提出了相应的防治建议。
DDT was banned in nineteen seventy-two. Wildlife experts now bring baby peregrines from the Chesapeake Bay area. Then they place the birds in rocky areas high above the Potomac River near Harpers Ferry. The baby birds wear a device that sends signals telling where there are. The devices let wildlife experts follow the birds'movements. They hope that before too long, many peregrines again will fly in these skies.
现在野生动物专家从切萨皮克海湾地区引进隼雏，然后将这些隼雏放到位于哈珀斯渡口附近的波托马哥河上游的岩石区，专家们在这些隼雏身上安放了一种能够传送信号的装置，这种装置能够告诉专家这些隼雏在什么地方，这种装置让野生动物专家跟踪这些鸟的活动，他们希望不久以后能有许多游隼再次飞向这片蓝天。
DATA SOURCES AND EXTRACTION: Contemporary data on DDT use were largely obtained from questionnaires and reports.
数据的来源和提炼：当代的DDT使用数据大多来自问卷调查和报告。
Polybrominated biphenyl ethers have received more and more concerns, because it is structurally familiar to PCBs and DDT both included in the category of persistent organic pollutants.
对比POPs斯德哥尔摩条约中的标准，已观测到和预测的物化性质表明部分的PBDEs同系物有可能是潜在的持续性有机污染物。
Furthermore, the jellium model was used to analyze the characteristic of SPR; the dipole model and the IR spectrum were used to form a new dipole model., It can be used to explain the mechanism of the red shift.4. The preparation of DDT-modified gold nanoparticles and the dicuss of theiroptical propertiesWe preparated DDT-modified gold nanoparticles using Brust approach.
十二烷基硫醇修饰的金纳米颗粒的制备及对其光学性质的探讨本文采用了Brust法制备了硫醇修饰的金纳米颗粒，用电镜进行了表征，表明制出的金纳米颗粒粒径比较均一，而且在浓度相当的情况下，能够通过化学键与范德瓦尔斯力之间的相互作用形成有序结构。
Measurements of protein concentration and the sodium dodecyl sulphate-polyacrylamide gel electrophoresis showed that 60%τ-butanol plus 4% DTT at a sample-weight to extraction-solution ratio of 1:8 was optimum for kafirin extraction.
蛋白浓度测定和SDS-PAGE电泳表明，DDT浓度为4%的60%叔丁醇溶液，样品质量比提取剂用量为1：8是提取高粱种子醇溶蛋白的最佳条件。