有毒性的

Polystyrene itself is non-toxic, but the residual polystyrene resin polymerization of styrene monomer and some other volatile substances, including ethylene, cumene, toluene, etc., have a certain toxicity.

聚苯乙烯本身是无毒的，但聚苯乙烯树脂聚合残留的单体苯乙烯及其他一些挥发性物质，包括乙烯、异丙苯、甲苯等，有一定毒性。

Results 2 ClAdo and 2 CldAdo had different cytotoxicities on the cells, while 2' dAdo had no cytotoxicity on the cells. 2 CldAdo blocked the cell growth at the phase of S and G2/M, while 2 ClAdo at the phase of G0/G1. 2 CldAdo mainly induced cell necrosis, while 2 ClAdo induced both cell necrosis and apoptosis. Down regulated Bcl 2 expression and up regulated p53 and Bax expression were associated with 2 ClAdo, while 2 CldAdo down regulated Bcl 2 expression and up regulated mildly p53 expression without any effect on Bax expression.

结果 2 ClAdo、2 CldAdo对所研究的细胞均有程度不等的毒性；2' dAdo对各细胞生长、增殖均无明显抑制（c=100 μmol/L即30 μg/mL内）；2 CldAdo明显阻断细胞于S、G2/M期，2 ClAdo阻断细胞于G0/G1期；2 CldAdo 致细胞坏死为主，2 ClAdo 既致细胞坏死又诱导凋亡；2 ClAdo 下调Bcl 2，上调P53、Bax蛋白表达；2 CldAdo小幅上调P53、小幅下调Bcl 2，不影响Bax蛋白表达。

But there are vocal mimics too, like a palatable species of tiger moth that deters bats by parodying the ultrasonic clicks of a toxic moth the bats detest, or like the greater racket-tailed drongo of Sri Lanka, which mimics the calls of other birds to drum up a mixed-species flock in which the drongos can more safely and efficiently forage.

但是也有针对声音的欺骗术，比如有一种自身美味无比的灯蛾会很搞笑地模仿一种令蝙蝠厌恶的毒性飞蛾的超声波频率，藉此逃避被吞吃的命运；还有一种长着像火箭似的尾巴的伊斯兰卡燕卷尾会模仿其他鸟类的叫声，招揽来各式各样的鸟群，它们身处其中会更加安全而且掠夺食物也有效率得多。

NGF had obvious cytotoxicity on these cell lines ,which shows to be dose-dependent, especially for MGC-803 and BEL-7404 ,their IC_(50) value at the 24~ hours are 49.9mg/L and 55.46mg/L ; Main features of apoptosis under fluorescent microscope include reduction in volume,nuclear chromatin condensation, intensification under jacinth fluorescence; The early apoptosis rate of pristine cells which detected by FCM increases with NGF dose increasing.

2NGF对4种人肿瘤细胞均有细胞毒性作用，且呈剂量依赖关系，尤其是对MGC-803和BEL-7404的抑制作用更强，作用24h的IC50值分别为49.9mg/L和55.46mg/L，荧光显微镜下可观察到MGC-803凋亡细胞的主要特点为：细胞体积缩小，染色质固缩，橘红色荧光增强；流式细胞仪检测到MGC-803细胞的早期凋亡率随NGF浓度的增高而增加，各浓度组与对照组的早期细胞凋亡率比较有明显差异(P＜0.01)。

Toxicity and repellent activity of several plant-based compounds on Blattella germanica were studied, results showed that rotenone, toosendanin and azadirachtin had stomach toxic effect on Blattella germanica, rotenone showed high stomach toxicity and all insects died after 8 hours, matrine also has deformative effect on Blattella germanica , matrine and toosendanin can affect oviposition of Blattella germanica; repellent activity of these botanicals was further studied, results showed that bering hydrochloridum, azadirachtin and sparteinehave had repellent activity against Blattella germanica, observation also showed that rotenone and bering hydrochloridum had high contact toxicity against Blattella germanica, the time of all insects knocked down were 8 and 48 hours.

选取了7种植物源化合物，测定了它们对德国小蠊的毒性和驱避性，结果表明，鱼藤酮、川楝素和印楝素对德国小蠊具有不同程度的胃毒作用，其中鱼藤酮乙酸乙酯溶液作用较强，8小时死亡率已达100％，川楝素和印楝素对德国小蠊也表现出一定的毒杀作用，观察还发现印楝素和苦参碱对德国小蠊的发育有致畸作用，苦参碱和川楝素影响其卵鞘形成；进一步对这几种化合物的驱避性进行研究，结果表明盐酸黄连素、鱼藤酮乳油和印楝素乳油对德国小蠊有不同程度的驱避作用，其驱避率分别为96.7％、51.3％和50.1％，另外观察到鱼藤酮乙酸乙酯溶液和盐酸黄连素对德国小蠊具有较强的触杀活性，供试虫全部被击倒的时间分别为8小时和48小时。

But there are vocal mimics too, like a palatable species of tiger moth that deters bats by parodying the ultrasonic clicks of a toxic moth the bats detest, or like the greater racket-tailed drongo of Sri Lanka, which mimics the calls of other birds to drum up a mixed-species flock in which the drongos can more safely and efficiently forage.

但是也有针对声音的欺骗术，比如有一种自身美味无比的灯蛾会很搞笑地模仿一种令蝙蝠厌恶的毒性飞蛾的超声波频率，藉此逃避被吞吃的命运；还有一种长着像火箭似的尾巴的伊斯兰卡燕卷尾（反正是一种鸟，我以前没听到过，长相如何请参见wiki，点这里。

To some extent,PA has toxic effect on many animals and the interaction of PA and other mycotoxin on animals will contribute to cumulative toxicity and enhance its toxicity.Hence,rapid and effective approaches of testing should be discovered and research on its toxicology to cope with the serious threat of PA posed to animals and humans.

青霉酸对多种动物有不同程度的毒性作用，且与其他霉菌毒素有累加、协同甚至增强作用，给动物和人们的身体健康带来很大的危害，因此迫切需要开展免疫学快速检测技术和毒理学的研究。

Large dose of GsA has strong toxic effects on cardiac muscles, and can cause cardiac malfunction.

大剂量免疫抑制剂CsA有较强的心肌毒性作用，可引起心脏功能异常。

There are signs that resistance in malaria vectors to the toxic action of DDT is spreading.

有迹象表明，在疟疾媒介抵抗中，DDT的毒性作用正在蔓延。

Material and method mop of anus of patient of diarrhoea of appearance of cholera of 1.1 sample origin 3 portion, puke 1. 1.2 reagent are fostered base minim biochemistry is in charge of (epidemic prevention of sanitation of logistics department of Zhejiang province military region examines a), detached agaragar (Jiangsu province sanitation and antiepideic station is microbial reagent factory), diagnostic serum of institute of biological product of Chengdu of Ministry of Public Health. System of APl20E biochemistry appraisal .

ETEC常见散发感染性腹泻，也有报道因ETEC污染水源而暴发腹泻[3]，笔者报告的是一起家庭型食物中毒患者肛拭中检出一株肠产毒性大肠埃希菌O6∶K15。1材料和方法1.1样品来源霍乱样腹泻病人肛拭3份、呕吐物1份。1.2试剂培养基微量生化管(浙江省军区后勤部卫生防疫检验所)，分离琼脂(江苏省卫生防疫站微生物试剂厂)，诊断血清(卫生部成都生物制品探究所)。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐