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生物农药研究进展(综述) 被引量:35
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作者 蒋琳 马承铸 《上海农业学报》 CSCD 2000年第S1期73-77,共5页
论述了近10年来源于植物、微生物和动物的生物农药研究进展。其中,微生物农药研究包括苏云金杆菌(Bt)晶体蛋白的基因研究,蜡状芽孢杆菌(B.cereus)和枯草芽孢杆菌(B.subtilis)中的抗菌多肽、非病原根瘤菌... 论述了近10年来源于植物、微生物和动物的生物农药研究进展。其中,微生物农药研究包括苏云金杆菌(Bt)晶体蛋白的基因研究,蜡状芽孢杆菌(B.cereus)和枯草芽孢杆菌(B.subtilis)中的抗菌多肽、非病原根瘤菌诱导的植物系统获得抗性,链霉菌中的阿维菌素、抗生素生物合成基因中的聚酮合酶基因,杀虫真菌中的绿僵菌研究进展等;植物农药研究包括生物碱、萜类、皂角甙等;动物农药研究包括抗菌蛋白的研究进展等。 展开更多
关键词 生物农药 晶体蛋白 抗菌多肽 非病原根瘤菌 植物抗性 阿维菌素 聚酮合酶基因 绿僵菌 生物碱 萜类 皂角甙
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Tier-1 assays for assessing the toxicity of insecticidal proteins produced by genetically engineered plants to non-target arthropods 被引量:11
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作者 Yun-He Li Jorg Romeis +1 位作者 Kong-Ming Wu Yu-Fa Peng 《Insect Science》 SCIE CAS CSCD 2014年第2期125-134,共10页
In assessing an insect-resistant genetically engineered (IRGE) crop before its commercialization, researchers normally use so-called "Tier-1 assays" as the initial step to determine the effects of the crop on non-... In assessing an insect-resistant genetically engineered (IRGE) crop before its commercialization, researchers normally use so-called "Tier-1 assays" as the initial step to determine the effects of the crop on non-target organisms. In these tests, the insecticidal proteins (IPs) produced by the IRGEs are added to the diets of test organisms in the laboratory. Test organisms in such assays can be directly exposed to much higher concentrations of the test IPs than they would encounter in the field. The results of Tier-1 assays are thus more conservative than those generated in studies in which the organisms are exposed to the IPs by feeding on IRGE plant tissue or in the case of predators or parasites, by feeding on invertebrate prey or hosts that have fed on IRGE plant tissue. In this report, we consider three important factors that must be considered in Tier-1 assays: (i) methods for delivery of the IP to the test organisms; (ii) the need for and selection of compounds used as positive controls; and (iii) methods for monitoring the concentration, stability and bioactivity of the IP during the assay. We also analyze the existing data from Tier-1 assays regarding the toxicity of Bt Cry proteins to non-target arthropod species. The data indicate that the widely used Bt proteins have no direct toxicity to non-target organisms 展开更多
关键词 artificial diet cry protein environmental risk assessment ELISA positivecontroll sensitive insect bioassay
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根癌农杆菌介导的CryⅠA(b)基因在毛壳菌中的转化 被引量:7
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作者 高兴喜 杨谦 《农业环境科学学报》 CAS CSCD 北大核心 2005年第1期22-25,共4页
利用根癌农杆菌介导的遗传转化方法,将CryⅠA(b)基因转入生物防治真菌毛壳菌中,转化率约为40~180个转化子·10-7个孢子。通过对转化子的RT-PCR检测和Southern杂交分析表明,CryⅠA(b)基因已整合进毛壳菌基因组中,而且在转录水平上... 利用根癌农杆菌介导的遗传转化方法,将CryⅠA(b)基因转入生物防治真菌毛壳菌中,转化率约为40~180个转化子·10-7个孢子。通过对转化子的RT-PCR检测和Southern杂交分析表明,CryⅠA(b)基因已整合进毛壳菌基因组中,而且在转录水平上得到表达,转化子都能够稳定遗传。根癌农杆菌介导的遗传转化具有高转化率、低拷贝、遗传稳定、操作简便等优点,因此有可能成为丝状真菌遗传转化和功能基因组研究的有力工具。 展开更多
关键词 根癌农杆菌 毛壳菌 cry A(b)基因 遗传转化
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我国不同森林立地带土壤中苏云金芽孢杆菌cry基因资源研究 被引量:6
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作者 张永安 宋福平 +2 位作者 戴莲韵 张杰 李长友 《林业科学研究》 CSCD 北大核心 2003年第1期19-25,共7页
利用PCR RFLP鉴定体系和SDS PAGE表达蛋白的分析方法,分析了来自我国不同森林立地带(寒温带、中温带、暖温带、北亚热带、中亚热带、南亚热带、高原亚热带、热带)自然保护区森林土壤中分离的72株苏云金芽孢杆菌的cry1、cry2、cry3、cry4... 利用PCR RFLP鉴定体系和SDS PAGE表达蛋白的分析方法,分析了来自我国不同森林立地带(寒温带、中温带、暖温带、北亚热带、中亚热带、南亚热带、高原亚热带、热带)自然保护区森林土壤中分离的72株苏云金芽孢杆菌的cry1、cry2、cry3、cry4、cry5、cry8、cry9、cry10、cry11、cry1I杀虫晶体蛋白基因类型,表达蛋白和杀虫活性的生物测定。研究表明:同时含有cry1、cry2、cry1I3类基因的有21株菌,6株菌含有cry1、cry2类基因,4株菌含有cry1和cry1I基因,只含有cry1基因的有1株,cry2基因的4株,36株菌不含所鉴定的10类基因。同时证明:绝大多数含有cry1基因的菌株表达了130kD蛋白,含有cry2基因的菌株表达了60kD的蛋白。对不同农、林害虫棉铃虫、杨扇舟蛾、舞毒蛾、马尾松毛虫、黄粉甲、榆兰叶甲、落叶松叶蜂等幼虫的杀虫活性进行了生物测定。进一步证明了苏云金芽孢杆菌cry基因,表达蛋白及杀虫活性三者的相关性。为生产和科研提供了生物治虫、抗虫育种新的苏云金芽孢杆菌cry基因资源。 展开更多
关键词 森林立地带 土壤 苏云金芽孢杆菌 杀虫晶体蛋白 cry 基因 杀虫剂 杀虫活性
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转cry 1Iem基因大豆的培育及抗虫性检测 被引量:9
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作者 陈秀华 柏锡 +5 位作者 潘欣 翟红 才华 纪巍 李勇 朱延明 《大豆科学》 CAS CSCD 北大核心 2009年第6期959-963,共5页
以大豆子叶节为外植体,应用农杆菌介导法,将抗虫(cry 1Iem)基因转化大豆,筛选标记为bar基因。经Gl-ufasinate筛选,获得大量抗性植株。对转基因T0、T1、T2代植株进行PCR检测,初步证明cry1Iem基因已经整合到大豆基因组中。对T2代PCR阳性... 以大豆子叶节为外植体,应用农杆菌介导法,将抗虫(cry 1Iem)基因转化大豆,筛选标记为bar基因。经Gl-ufasinate筛选,获得大量抗性植株。对转基因T0、T1、T2代植株进行PCR检测,初步证明cry1Iem基因已经整合到大豆基因组中。对T2代PCR阳性植株幼嫩豆荚,采用圆盘分隔法接入初孵幼虫,进行初步的抗虫性检测,得到1株具有明显抗虫效果和7株抗虫效果较好的转基因植株。 展开更多
关键词 大豆 cry 1Iem基因 子叶节 转基因抗性植株 抗虫性检测
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Identification and Distribution of Bacillus thuringiensis Isolates from Primeval Forests in Yunnan and Hainan Provinces and Northeast Region of China 被引量:5
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作者 SU Xu-dong SHU Chang-long +3 位作者 ZHANG Jie HUANG Da-fang TAN Jian-xin SONG Fu-ping 《Agricultural Sciences in China》 CAS CSCD 2007年第11期1343-1351,共9页
Ninety-two Bacillus thuringiensis isolates were screened from 683 soil samples collected from tropical and semitropical primeval forests in Yunnan and Hainan provinces of China. Several shapes of crystals, including b... Ninety-two Bacillus thuringiensis isolates were screened from 683 soil samples collected from tropical and semitropical primeval forests in Yunnan and Hainan provinces of China. Several shapes of crystals, including bipyramidal, square, ovoid, spherical, and amorphous, were observed in the B. thuringiensis isolates. Twenty-six pairs of primers were used to identify 31 holotype cry genes at primary rank of the B. thuringiensis cry gene nomenclature system. The cry gene-types of 92 B. thuringiensis isolates and 33 B. thuringiensis isolates screened from Northeast region of China were identified by PCR-RFLP and SDS-PAGE methods. Fifty-eight isolates harbored cry1 genes, 32 isolates cry2 genes, 12 isolates cry8 genes, 3 isolates cry9 genes, 12 isolates cry11 genes, and 13 isolates cry30 genes. Of the tested isolates, 42 produced no reaction product with 26 pairs of primers and also exhibited no toxicity against 8 insect species tested. The isolate Z2-34 harbored a novel cry30 gene, exhibited insecticidal activity against Aedes albopictus of Dipterans. The accession number of the novel genes in this study is AY916046. Isolation and identification of B. thuringiensis and cry gene are important for investigating the diversity of B. thuringiensis resources and cloning new cry gene. 展开更多
关键词 Bacillus thuringiensis PCR-RFLP cry gene Aedes albopictus
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Effects and mechanisms of Bacillus thuringiensis crystal toxins for mosquito larvae 被引量:6
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作者 Qi Zhang Gang Hua Michael J. Adang 《Insect Science》 SCIE CAS CSCD 2017年第5期714-729,共16页
Bacillus thuringiensis is a Gram-positive aerobic bacterium that produces insecticidal crystalline inclusions during sporulation phases of the mother cell. The vir- ulence factor, known as parasporal crystals, is comp... Bacillus thuringiensis is a Gram-positive aerobic bacterium that produces insecticidal crystalline inclusions during sporulation phases of the mother cell. The vir- ulence factor, known as parasporal crystals, is composed of Cry and Cyt toxins. Most Cry toxins display a common 3-domain topology. Cry toxins exert intoxication through toxin activation, receptor binding and pore formation in a suitable larval gut environment. The mosquitocidal toxins of Bt subsp, israelensis (Bti) were found to be highly active against mosquito larvae and are widely used for vector control. Bt subsp, jegathesan is another strain which possesses high potency against broad range of mosquito larvae. The present review summarizes characterized receptors for Cry toxins in mosquito larvae, and will also discuss the diversity and effects of 3-D mosquitocidal Cry toxin and the ongo- ing research for Cry toxin mechanisms generated from investigations of lepidopteran and dipteran larvae. 展开更多
关键词 Bacillus thuringiensis cry toxins mode of action MOSQUITO RECEPTORS
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Obtaining High Pest_resistant Transgenic Upland Cotton Cultivars Carrying cry1Ac3 Gene Driven by Chimeric OM Promoter 被引量:5
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作者 陈宛新 肖桂芳 朱祯 《Acta Botanica Sinica》 CSCD 2002年第8期963-970,共8页
Hypocotyl segments from aseptic seedlings of two important cultivars of upland cotton ( Gossypium hirsutum L.) in Northwest China, 'Xinluzao_1', 'Jinmian_7', 'Jinmian_12' and 'Jihe_321&#... Hypocotyl segments from aseptic seedlings of two important cultivars of upland cotton ( Gossypium hirsutum L.) in Northwest China, 'Xinluzao_1', 'Jinmian_7', 'Jinmian_12' and 'Jihe_321' were transformed respectively by two efficient plant expression plasmids pBinMoBc and pBinoBc via Agrobacterium tumefaciens . In pBinMoBc, cry 1Ac3 gene, which encodes the Bt toxin, is under the control of chimeric OM promoter. In pBinoBc, it is under control of CaMV 35S promoter. After co_cultivation with Agrobacterium tumefimpfaciens LBA4404 (containing pBinMoBc or pBinoBc), kanamycin_resistant selection, somatic embryos were induced and regenerated plants were obtained. Then the regenerated plantlets were grafted to untransformed stocks in greenhouse to produce descendants. The integration of cry 1Ac3 gene and its expression in T 2 generation of transgenic cotton plants were confirmed by Southern hybridization and Western blotting. The analyses of insect bioassay indicated that the transgenic plants of both constructions have significant resistance to the larvae of cotton bollworm ( Heliothis armigera ) and that cry 1Ac3 gene driven by chimeric OM promoter could endue T 2 generation cotton with high pest_resistant ability, implicating that it has a profound application in genetic engineering to breed new pest_resistant cotton varieties. 展开更多
关键词 upland cotton insect_resistant cotton transgenic plant Agrobacterium tumefaciens cry 1Ac3 gene chimeric promoter
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cry Ia基因小麦高效表达载体的构建 被引量:5
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作者 侯文胜 郭三堆 路明 《西北农林科技大学学报(自然科学版)》 CSCD 北大核心 2002年第6期121-124,共4页
 利用在禾谷类作物中表达效率较高的启动子Ubi对含目的基因cryIa的现有载体进行了改造,并引入了筛选标记基因bar,为提高目的基因的表达水平,还在目的基因5′端引入了Ω和Kozak序列,3′端引入了poly(A)序列。成功构建了适用于小麦的抗...  利用在禾谷类作物中表达效率较高的启动子Ubi对含目的基因cryIa的现有载体进行了改造,并引入了筛选标记基因bar,为提高目的基因的表达水平,还在目的基因5′端引入了Ω和Kozak序列,3′端引入了poly(A)序列。成功构建了适用于小麦的抗虫基因植物表达载体pGU4ABBar,该载体含有顺向连接的Ubi-cryIa及Ubi-bar基因表达盒,可用于基因枪、花粉管通道法等介导的小麦遗传转化,人工合成的苏云金芽孢杆菌杀虫蛋白基因cryIa可以编码对鳞翅目昆虫具有毒杀作用的蛋白。 展开更多
关键词 cry Ia基因 小麦 高效表达载体 启动子 质粒
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Bt晶体蛋白Cry1Ac放射免疫检测技术研究 被引量:7
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作者 潘家荣 乔艳红 +2 位作者 张维 林敏 张杰 《核农学报》 CAS CSCD 北大核心 2006年第6期544-547,共4页
通过苏云金芽孢杆菌(Bt)HD-73培养,提取Bt晶体蛋白Cry1Ac,经酶解后获得高抗虫活性蛋白。免疫新西兰白兔得到高纯度的Bt晶体蛋白1Ac抗体,用125I标记抗原,研究和建立了Bt晶体蛋白Cry1Ac的放射免疫检测技术,该试剂盒用磁性微粒作分离剂,不... 通过苏云金芽孢杆菌(Bt)HD-73培养,提取Bt晶体蛋白Cry1Ac,经酶解后获得高抗虫活性蛋白。免疫新西兰白兔得到高纯度的Bt晶体蛋白1Ac抗体,用125I标记抗原,研究和建立了Bt晶体蛋白Cry1Ac的放射免疫检测技术,该试剂盒用磁性微粒作分离剂,不需离心即可分离,简化了测定步骤,检测结果达到国外同类产品(酶联免疫试剂盒)的水平。 展开更多
关键词 BT cry 1Ac蛋白 放射免疫 转基因检测
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峡江号子的源流及艺术特色 被引量:6
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作者 杜鸿 李沂 《中南民族大学学报(人文社会科学版)》 CSSCI 北大核心 2008年第1期159-163,共5页
峡江号子依赖木船、险滩和纤工船工而存在,三个元素缺一不可。峡江号子是纤夫船工生命极限上的呐喊,是他们对生命这个最本质的欲望欠缺所产生的诉求和极度热爱。在艺术气质上,峡江号子与主流文化意识始终保持着隔膜和分离,这是民间智慧... 峡江号子依赖木船、险滩和纤工船工而存在,三个元素缺一不可。峡江号子是纤夫船工生命极限上的呐喊,是他们对生命这个最本质的欲望欠缺所产生的诉求和极度热爱。在艺术气质上,峡江号子与主流文化意识始终保持着隔膜和分离,这是民间智慧对应的直觉智慧及其艺术方式所决定的。而其强烈的野性美、原始的活性美和摧枯拉朽的力量美,呈示出独具一格的魅力,是其它文化艺术所难能企及的。 展开更多
关键词 共生性 生命极限 民间智慧 呐喊
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Cry类和Vip3Aa类Bt杀虫蛋白对亚洲玉米螟的毒力和增效作用 被引量:2
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作者 胡小华 王振营 +2 位作者 何康来 解海翠 王月琴 《植物保护》 CAS CSCD 北大核心 2023年第2期310-315,共6页
筛选对靶标害虫高效的Bt杀虫蛋白、评价蛋白组合对靶标害虫的杀虫作用,对于转基因抗虫新品种的研发具有重要的指导意义。本文采用人工饲料混合法评价了Cry1Ab、Cry1Fa、Cry1Ca、Cry1Ba、Cry2Aa、Vip3Aa11、Vip3Aa20、Vip3Aa19共8种Bt杀... 筛选对靶标害虫高效的Bt杀虫蛋白、评价蛋白组合对靶标害虫的杀虫作用,对于转基因抗虫新品种的研发具有重要的指导意义。本文采用人工饲料混合法评价了Cry1Ab、Cry1Fa、Cry1Ca、Cry1Ba、Cry2Aa、Vip3Aa11、Vip3Aa20、Vip3Aa19共8种Bt杀虫蛋白对亚洲玉米螟的毒力;同时评估了Cry1Ab/Vip3Aa19、Cry1Fa/Vip3Aa19混合蛋白对亚洲玉米螟的杀虫作用,筛选出毒力最佳的组合比例。结果表明:Cry1Ab、Cry1Fa、Cry2Aa对亚洲玉米螟的LC 50在0.24~0.72μg/g之间,其中Cry1Ab的毒力最强,显著高于Cry1Fa和Cry2Aa蛋白,Cry1Fa与Cry2Aa毒力无显著性差异。Cry1Ca、Cry1Ba、Vip3Aa11、Vip3Aa20、Vip3Aa19对亚洲玉米螟的LC 50均大于50μg/g。当Cry1Ab/Vip3Aa19、Cry1Fa/Vip3Aa19混合比例为1∶1时,增效作用最强,增效因子分别为3.18和1.58。本研究结果为多价转基因玉米的研发提供了重要依据。 展开更多
关键词 BT cry Vip3Aa 亚洲玉米螟
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脑外伤性癫痫患者炎性细胞因子和C反应蛋白变化及其临床意义 被引量:5
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作者 彭威 张树方 +1 位作者 何晓云 金维 《临床和实验医学杂志》 2013年第10期770-771,773,共3页
目的探讨脑外伤性癫痫患者炎性细胞因子白细胞介素-2(IL-2)、白细胞介素-6(IL-6)、肿瘤坏死因子α(TNF-α)和C反应蛋白(CRP)的变化及意义。方法选自2009年1月至2012年1月收治的脑外伤并发癫痫的患者37例,采用采用酶联免疫吸附法检测检... 目的探讨脑外伤性癫痫患者炎性细胞因子白细胞介素-2(IL-2)、白细胞介素-6(IL-6)、肿瘤坏死因子α(TNF-α)和C反应蛋白(CRP)的变化及意义。方法选自2009年1月至2012年1月收治的脑外伤并发癫痫的患者37例,采用采用酶联免疫吸附法检测检测患者外周血中第1、3、5、7 d时IL-2、IL-6、TNF-α和CRP的水平,同时选同期20例健康人群作为对照组。结果两组1、3、5、7 d IL-2、IL-6、TNF-α和CRP水平比较差异有显著性(P<0.05,P<0.01)。脑外伤性癫痫中度、重度组IL-2、IL-6、TNF-α和CRP水平均显著高于轻度组(P<0.05)。结论脑外伤性癫痫患者外周血中IL-2、IL-6、TNF-α和CRP水平显著升高且IL-2、IL-6、TNF-α和CRP水平与病情严重程度有关,提示炎性因子与CRP对癫痫的发作有影响。 展开更多
关键词 脑外伤性癫痫 IL-2 IL-6 TNF-α CRP
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低温超导组件的标定与准直测量 被引量:2
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作者 袁建东 张斌 姚俊杰 《低温与超导》 CAS 北大核心 2015年第4期50-53,共4页
Cry Module由于其无法通视和超低温特性,是超导直线加速器准直中的重点与难点。文中提出由激光跟踪仪和测微准直望远镜协同准直冷质量组件。作者设计了测微准直望远镜所用十字丝目标及其支架,而且成功安装低温超导组件,监测了两次低温... Cry Module由于其无法通视和超低温特性,是超导直线加速器准直中的重点与难点。文中提出由激光跟踪仪和测微准直望远镜协同准直冷质量组件。作者设计了测微准直望远镜所用十字丝目标及其支架,而且成功安装低温超导组件,监测了两次低温实验时的位移。常温安装精度达到0.15mm,低温监测精度达到0.5mmm。目前ADS-Cry Module已通过中期检查验收,成功引出能量2.68Me V、最大流强3.6m A的连续波质子束,束流功率达到9.6k W,是目前国际上连续束运行的超导质子直线加速器中束流功率最高的,也是我国首次实现超导高频腔加速毫安级连续波质子束。这标志着我国强流质子超导直线加速器技术进入国际先进行列。 展开更多
关键词 cry MODULE 准直 激光跟踪仪 测微准直望远镜 螺线管 超导腔
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The Binding Characterization of Cry Insecticidal Proteins to the Brush Border Membrane Vesicles of Helicoverpa armigera, Spodoptera exigua, Spodoptera litura and Agrotis ipsilon 被引量:2
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作者 LU Qiong CAO Guang-chun +4 位作者 ZHANG Li-li LIANG Ge-mei GAO Xi-wu ZHANG Yong-jun GUO Yu-yuan 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2013年第9期1598-1605,共8页
Cry toxins produced by Bacillus thuringiensis (Bt) are effective biological insecticides against certain insect species. However, there are potential risks of the evolved resistance of insects to Cry toxin owing to ... Cry toxins produced by Bacillus thuringiensis (Bt) are effective biological insecticides against certain insect species. However, there are potential risks of the evolved resistance of insects to Cry toxin owing to decreased binding of toxins to target sites in the brush border membranes of the larva midgut. The Cry toxins with different binding sites in the larval midgut have been considered to be a good combination to deploy in delaying resistance evolution. Bioassay results demonstrated that the toxicity of different Cry toxins ranked differently for each species. The toxicity ranking was CrylAc〉CrylAb〉Cry2Ab for Helicoverpa armigera, CrylB〉CrylC〉Cry2Ab for Spodoptera exigua, and Cry2Ab〉CrylB〉 CrylC for S. litura. Only Cry2Ab was toxic to Agrotis ipsilon. Binding experiments were performed with ^125I-CrylAb, ^125I-CrylAc, ^125I-CrylB, ^125I-CrylC, ^125I-Cry2Ab and the brush border membranes vesicles (BBMV) from H. armigera, S. exigua, S. litura and A. ipsilon. The binding of CrylAb and CrylAc was shown to be saturable by incubating with increasing concentrations of H. armigera BBMV (Kd=(45.00+2.01) nmol L-1 and (12.80+0.18) nmol L^-1, respectively; Bmax=(54.95±l.79) ng and (55.44±0.91) ng, separately). The binding of CrylB was shown to be saturable by incubating with increasing concentrations ofS. exigua BBMV (Kd=(23.26±1.66) nmol L^-1; Bmax=(65.37±1.87) ng). The binding of ^125I-Cry toxins was shown to be non-saturable by incubating with increasing concentrations of S. litura and A. ipsilon BBMV. In contrast, CrylB and CrylC showed some combination with the BBMV orS. litura, and a certain amount of Cry2Ab could bind to the BBMV ofA. ipsilon. These observations suggest that a future strategy could be devised for the focused combination of specific cry genes in transgenic crops to control target pests, widen the spectrum of insecticide effectiveness and postpone insect resistance evolution. 展开更多
关键词 cry toxin TOXICITY binding assays 1251 labeling BBMV
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Infant Cry Language Analysis and Recognition:An Experimental Approach 被引量:2
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作者 Lichuan Liu Wei Li +1 位作者 Xianwen Wu Benjamin X.Zhou 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2019年第3期778-788,共11页
Recently, lots of research has been directed towards natural language processing. However, the baby's cry, which serves as the primary means of communication for infants, has not yet been extensively explored, bec... Recently, lots of research has been directed towards natural language processing. However, the baby's cry, which serves as the primary means of communication for infants, has not yet been extensively explored, because it is not a language that can be easily understood. Since cry signals carry information about a babies' wellbeing and can be understood by experienced parents and experts to an extent, recognition and analysis of an infant's cry is not only possible, but also has profound medical and societal applications. In this paper, we obtain and analyze audio features of infant cry signals in time and frequency domains.Based on the related features, we can classify given cry signals to specific cry meanings for cry language recognition. Features extracted from audio feature space include linear predictive coding(LPC), linear predictive cepstral coefficients(LPCC),Bark frequency cepstral coefficients(BFCC), and Mel frequency cepstral coefficients(MFCC). Compressed sensing technique was used for classification and practical data were used to design and verify the proposed approaches. Experiments show that the proposed infant cry recognition approaches offer accurate and promising results. 展开更多
关键词 Compressed sensing FEATURE extraction INFANT cry signal LANGUAGE RECOGNITION
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生命的呐喊 心灵的倾诉——爱德华·蒙克的艺术 被引量:4
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作者 巫明 《安徽师范大学学报(社会科学版)》 2002年第4期493-495,共3页
蒙克是 19世纪末和 2 0世纪初挪威杰出的表现主义绘画大师 ,他的绘画充分表现出鲜明的时代特点和独特风格 ,给人以颤栗 ,是生命的呐喊 。
关键词 爱德华·蒙克 表现主义 绘画 艺术风格 主题
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Functional assessment of cadherin as a shared mechanism for cross/dual resistance to Cry1Ac and Cry2Ab in Helicoverpa zea
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作者 Jizhen Wei Min Zhang +4 位作者 Pin Li Zhongyuan Deng Xinming Yin Shiheng An Xianchun Li 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2024年第5期1604-1617,共14页
Helicoverpa zea is a major target pest of pyramided transgenic crops expressing Cry1,Cry2 and/or Vip3Aa proteins from Bacillus thuringiensis(Bt)in the United States.Laboratory-selected Cry1Ac/Cry2Ab cross resistance a... Helicoverpa zea is a major target pest of pyramided transgenic crops expressing Cry1,Cry2 and/or Vip3Aa proteins from Bacillus thuringiensis(Bt)in the United States.Laboratory-selected Cry1Ac/Cry2Ab cross resistance and fieldevolved practical dual resistance of H.zea to these two toxins have been widely reported.Whether the widespread Cry1Ac/Cy2Ab dual resistance of H.zea has resulted from the selection of one shared or two independent resistance mechanisms by pyramided Bt crops remains unclear.Cadherin is a well-confirmed receptor of Cry1Ac and a suggested receptor of Cry2Ab in at least three Lepidopteran species.To test whether cadherin may serve as one shared mechanism for the cross and dual resistance of H.zea to Cry1Ac and Cry2Ab,we cloned H.zea cadherin(HzCadherin)cDNA and studied its functional roles in the mode of action of Cry1Ac and Cry2Ab by gain-and lossof-function analyses.Heterologous expression of HzCadherin in H.zea midgut,H.zea fat body and Sf9 cells made all three of these cell lines more susceptible to activated Cry1Ac but not activated Cry2Ab,whereas silencing HzCadherin of H.zea midgut and fat body cells significantly reduced the susceptibility to Cry1Ac but not Cry2Ab.Likewise,suppressing HzCadherin with siRNA made H.zea larvae resistant to Cry1Ac.These results clearly demonstrate that HzCadherin is not a receptor for Cry2Ab,and thus it is unlikely to serve as one shared mechanism for the cross and dual resistance of H.zea to Cry1Ac and Cry2Ab. 展开更多
关键词 Bt crops CADHERIN cry toxin RECEPTOR resistance mechanism
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Efficacy of 25% dextrose versus breast milk on pain and duration of cry during heel prick in neonates: A systematic review and meta-analysis
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作者 Sabitri ACHARYA Pity KOUL +1 位作者 Santosh POKHREL Talagatoti David Ratna PAUL 《Journal of Integrative Nursing》 2024年第4期209-217,共9页
Neonates,especially admitted to neonatal intensive care unit,frequently need various medical interventions in their early days.A common procedure is the heel prick for blood sampling.Although necessary for diagnosis,t... Neonates,especially admitted to neonatal intensive care unit,frequently need various medical interventions in their early days.A common procedure is the heel prick for blood sampling.Although necessary for diagnosis,this procedure can be stressful for neonates,causing pain,extended crying,and discomfort.Reducing distress in neonates during such procedures is important for the well‐being of neonates and the satisfaction of caregivers and healthcare providers.Therefore,this review aims to identify and compare the efficacy of 25%dextrose and breast milk on pain and duration of cry among neonates during heel-lance.As part of its review process,the article examined widely used databases,including PubMed,EMBASE,Cochrane,Academia,and Google Scholar.For the meta-analysis,the authors utilized RevMan 5.4.All eligible trials were analyzed using the Cochrane Risk of Bias Tool to assess the quality of the included studies and evaluate the risk of bias.Out of 131 studies reviewed,seven studies were included in meta-analysis of pain,and four studies were included in duration of cry.The results show that 25%dextrose is more effective to reduce pain among neonates during minor invasive procedure like heel prick(P<0.00001),whereas both interventions are effective in the reduction of crying duration.This review highlights that dextrose is more effective in reducing pain in comparison to breast milk.However,additional well-designed studies with larger sample sizes and extended follow-up periods are needed to validate and build upon the current findings.Hence,this review underscores the importance of utilizing effective pain management strategies,such as 25%dextrose,to enhance neonatal care and improve the overall well-being of newborns during invasive procedures. 展开更多
关键词 BREASTMILK DEXTROSE duration of cry heel prick NEONATES
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语音识别技术对新生儿疼痛与非疼痛啼哭的分类研究 被引量:4
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作者 汤亚南 童笑梅 +2 位作者 王之禹 刘惠丽 郑粤吟 《临床儿科杂志》 CAS CSCD 北大核心 2009年第3期236-238,242,共4页
目的运用语音识别技术对新生儿疼痛与非疼痛的啼哭声进行分类,通过分析啼哭声以求对新生儿疼痛提供一种客观的评价方法。方法采集疼痛与非疼痛状态下的新生儿啼哭声,分析其基本声学特征,计算啼哭声信号的基频(F0)和第一(F1)、第二(F2)... 目的运用语音识别技术对新生儿疼痛与非疼痛的啼哭声进行分类,通过分析啼哭声以求对新生儿疼痛提供一种客观的评价方法。方法采集疼痛与非疼痛状态下的新生儿啼哭声,分析其基本声学特征,计算啼哭声信号的基频(F0)和第一(F1)、第二(F2)、第三(F3)共振峰,确定相关参数是否可以用于区分疼痛与非疼痛状态下的新生儿啼哭声。进一步提取美尔倒谱系数(MFCC),运用动态时间规整算法(DTW)对啼哭声进行分类。结果疼痛和非疼痛啼哭声的声学指标中基频F0值差异有统计学意义(P<0.05),而共振峰F1、F2和F3对于区分疼痛和非疼痛啼哭声差异无统计学意义(P>0.05)。6、12、24阶的MFCC对疼痛和非疼痛啼哭声的识别率分别为59.32%、72.88%、62.71%。结论语音识别可以作为新生儿疼痛鉴别和评价研究的可行技术。基频F0可用于区分两种类型的啼哭声,是影响对婴儿啼哭听觉感知的主要声学特征。在三种阶次的MFCC系数比较中,12阶的MFCC系数识别效果较好。 展开更多
关键词 新生儿 疼痛 语音识别 啼哭
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