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N-Oxidation at the diethylamino group of hycanthone, of lucanthone, and of two chlorobenzothiopyranoindazoles resulted in a marked reduction in mutagenic activity, while antischistosomal activity was retained or even enhanced. Introduction of chlorine into the 8-position of benzothiopyranoindazoles reduced acute toxicity but had no effect on chemnotherapeutic potency. These dissociations of biological activities indicate that safer antischistosomal compounds of this class can be developed. 相似文献
63.
岭南盆景产业化开发的意义与对策 总被引：3，自引：0，他引：3
在我国加入WTO的背景下，产业化开发是岭南产业振兴的必由之路，建议采取以下对策来推动岭南盆景产业化开发：牢固树立盆景产业化开发意识；积极培育产业龙头企业；大力建设盆景产业化基地；切实加强产地批发市场建设；不断拓展盆景产业社会化服务的领域；适时加大政府对盆景产业宏观调控的力度。 相似文献
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Unnithan Kumar Siddharth Turnbull Jonathon Hartman Davies Oscar Hodgetts Timothy Cushman Samuel Alan 《Landscape Ecology》2022,37(10):2465-2480
Landscape Ecology - Landscape connectivity, the extent to which a landscape facilitates the flow of ecological processes such as organism movement, has emerged as a central focus of landscape... 相似文献
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An under‐sized three‐month‐old female bull terrier was referred with a history of regurgitation since three days of age. Thoracic radiographs were unremarkable, while abdominal radiographs showed a distended stomach, despite a 12 hour fast. Abdominal ultrasonography revealed gastric outflow obstruction of unclear aetiology. Coeliotomy was performed, during which an excessive mucosal fold at the pyloric antrum was excised. Histopathology of the pyloric fold revealed mild oedema and fibrosis of the mucosal tissue. The dog made a complete recovery, with resolution of regurgitation and grew to within the expected breed size. In the authors’ opinion, this is the first canine report of congenital antral mucosal valve resulting in gastric outflow obstruction, and only the second report in any species. 相似文献
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Abstract Cercospora leaf spot, caused by Cercospora canescens and powdery mildew, caused by Erysiphe polygoni are two of the most important fungal diseases of mungbeans. Nearly 4000 accessions of the global mungbean collection at the Asian Vegetable Research and Development Center were screened for resistance to these two pathogens. Less than 4% and 12% of the accessions showed resistance to Cercospora leaf spot and powdery mildew, respectively. The level of resistance to Cercospora leaf spot varied and highly resistant lines were not found. A few lines were rated highly resistant to powdery mildew over several years but others were rated moderately resistant or susceptible in other years. 相似文献