New ways and new hopes for IGR development     

Marek Jindra 《Journal of Pesticide Science》2021,46(1):3

Insect Growth Regulators (IGRs) represent advanced, bio-rational insecticides. This Special Issue reflects progress in IGR development that has been enabled by insight into the molecular principles of biosynthetic or hormone signaling pathways. The unifying principle is aiming at processes and molecular targets that are unique to arthropods and ideally to narrower insect taxa representing pests or disease vectors. While some strategies of obtaining the desired compounds for chemical intervention rely on rational, structure-based design or computational power, others exploit technologies allowing automated, high-throughput screening of large chemical libraries. All avenues leading to selective and environmentally safe pest control are valid as we face the imminent threat of the declining world insect population.  相似文献   

Inducing substance for abalone larval metamorphosis from the crustose coralline alga Hydrolithon samoense     

Kiyotake  SUENAGA  Hidenari  HORI  Hitoshi  ISHIDA  Haruo  NUKAYA  Rodney D.  ROBERTS  Kuniro  TSUJI 《Fisheries Science》2004,70(2):342-344

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家蚕幼虫体黄酮类化合物的提取及测定方法   总被引：2，自引：4，他引：2  

刘淑梅  时连根  李有贵 《蚕业科学》2005,31(1):74-78

为推进家蚕幼虫体的药用开发,研究了家蚕幼虫体黄酮类化合物含量的测定方法。将家蚕幼虫粉过80目筛,选用80%乙醇为溶剂,原料质量浓度按00333g/mL在60℃下抽提4h,重复抽提3次,可高效地提取家蚕幼虫体黄酮类化合物。以NaNO2Al(NO3)3显色,用紫外分光光度计于510nm波长下比色,可精确、稳定地测定出家蚕幼虫体中黄酮类化合物含量。家蚕幼虫体富含黄酮类化合物,其质量比达23770mg/g左右。  相似文献   

Molecular response and developmental speculations in metamorphosis of the veined rapa whelk,Rapana venosa     

Pu SHI  Hao SONG  Jie FENG  Meijie YANG  Zhenglin YU  Zhi HU  Cong ZHOU  Haizhou LI  Tao ZHANG 《Integrative zoology》2023,18(3):506-517

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稻螟蛉幼虫空间分布型的研究     

李桂兰  钟诚 《沈阳农业大学学报》1999,30(3):270-272

在第3，4代稻螟蛉幼虫盛发期，测定了田间幼虫空间分布格局。其水平分布属于聚集分布中的奈曼分布，垂直分布幼虫多集中在稻株中上部叶片。  相似文献   

稻水象甲幼虫发生程度对水稻生长发育及产量损失的影响   总被引：2，自引：0，他引：2  

周社文  谭小平  张佳峰  曾燕清  李贵尤  杜永春 《植物检疫》2007,21(6):345-346

稻水象甲幼虫为害水稻根后,导致水稻植株矮缩、发黄、分蘖减少甚至死苗,造成水稻严重减产,本文对稻水象甲发生程度对水稻生长发育及产量损失的影响进行研究。  相似文献   

不同种昆虫病原线虫对同一寄主个体的竞争及对线虫繁殖的影响     

张中润  王果红  曹莉  许再福  韩日畴 《中国生物防治》2007,23(3):223-227

采用注射侵染和自然侵染法，测试了长尾斯氏线虫X-7品系、小卷蛾斯氏线虫All品系和嗜菌异小杆线虫H06品系对同一寄主大蜡螟幼虫的相互作用，及其对线虫繁殖的影响。结果表明，无论是注射侵染还是自然侵染法，对大蜡螟幼虫个体的致死竞争能力最强的是长尾斯氏线虫，其次是小卷蛾斯氏线虫，嗜菌异小杆线虫的致死能力最弱。在同一大蜡螟幼虫体内时。异小杆线虫的繁殖受斯氏线虫的不利影响较大，而两种斯氏线虫的繁殖受异小杆线虫的不利影响较小。两种斯氏线虫对各自的繁殖影响不大。  相似文献   

Developmental changes in pituitary–thyroid axis, and formation of gonads in leptocephali and glass eels of Anguilla spp.     

Yuichi Ozaki  Hiromi Okumura  Yukinori Kazeto  Toshitaka Ikeuchi  Shigeho Ijiri  Masaki Nagae  Shinji Adachi and  Kohei Yamauchi 《Fisheries Science》2000,66(6):1115-1122

SUMMARY: Pituitary, thyroid gland and gonads in leptocephali of Japanese eel Anguilla japonica (19.8–32.6 mm in total length), A. obscura (45.0 mm), and A. bicolor pacifica (49.5 mm) and those in glass eels of the Japanese eel were histologically and immunohistochemically examined in order to observe the developmental changes of these endocrine organs in the Anguillidae. The pituitary, consisting of adenohypophysis and neurohypophysis in Japanese eel leptocephali over 22.5 mm, did not contain thyroid stimulating hormone (TSH) immunoreactive cells. Such cells were, however, detectable in the more developed pituitaries of leptocephali of A. obscura and A. bicolor pacifica and in those of glass eels. Conversely, thyroxine (T₄)-immunoreactive thyroid follicles could be detected in all specimens, both leptocephalic and glass eel. Only in glass eels, gonads were found in the body cavity, and these gonads harbored one or two primordial germ cells (PGC) per cross-section. Our results indicate that thyroid hormones (TH) production started prior to TSH production, and that TSH and TH are both secreted during the metamorphosis from leptocephalus to glass eel. Therefore, it is plausible that the TSH–TH axis is involved in the metamorphosis from leptocephalus to glass eel, but not in the early growth from preleptocephalus to leptocephalus.  相似文献   

水温对方格星虫幼体发育及变态的影响   总被引：9，自引：2，他引：7  

兰国宝 《水产学报》2007,31(5):633-638

研究了温度对方格星虫浮游期海球幼体发育和附着幼体变态发育的影响。实验用的亲虫来自本地海区,试验幼体通过人工催产和孵化获得。结果表明,浮游期海球幼体的发育时间与温度变化的关系极密切,并遵从Log istic曲线分布。适宜的发育温度为27.5~32.0℃之间。幼体变态发育的临界温度为27.5~28.0℃,适宜水温30.0~34.0℃之间。在30℃以上进行变态发育的幼体,变态率和变态成活率都明显提高,变态后成活率达20%以上。本文还讨论了中国方格星虫自然分布与海区水温分布的关系,认为方格星虫的自然分布自北向南增高的原因与水温有关。  相似文献   

Introduced slugs and indigenous caterpillars as facilitators of carbon and nutrient mineralisation on a sub-Antarctic island     

V.R. Smith 《Soil biology & biochemistry》2007,39(2):709-713

Indigenous soil macroinvertebrates (moth larvae, weevil larvae, earthworms) are cardinal agents of nutrient release from litter on sub-Antarctic Marion Island (47°S, 38°′E). Their populations are threatened through predation by introduced house mice, which do not prey on an introduced slug Deroceras panormitanum. A microcosm study was carried out to explore whether slugs affect rates of carbon and inorganic nutrient mineralisation from plant litter differently to an indigenous caterpillar (larva of a flightless moth Pringelophaga marioni). Caterpillars stimulated N, Ca, Mg and K mineralisation from plant litter two to five times more than slugs did, whereas the two invertebrate types stimulated C and P mineralisation to the same degree. Consequently, ratios of C:N and N:P released from the litter were different for slugs and caterpillars. Such differences might affect peat nutrient quality and ultimately the peat accumulation-decomposition balance, an important driver of ecological succession. This suggests that slugs cannot simply replace caterpillars without consequences for ecosystem structure and functioning on the island.  相似文献