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排序方式: 共有260条查询结果,搜索用时 15 毫秒
1.
黄土高原地区提取植被信息方法的研究 总被引:16,自引:0,他引:16
池宏康 《Acta Botanica Sinica》1996,38(1):40-44
研究评价了适于黄土高原地区植被信息提取的最佳植被指数和方法。该地区分布有落叶阔叶林、草原和荒漠,植被类型丰富多样。然而土壤背景对植被信息提取有较大影响。经对比分析,修正后的土壤调节植被指数(MSAVI), 不仅能增强植被信号,并能大大减小土壤背景的影响,同时又能宏观地反映该地区植被类型的分布状况。它是黄土高原地区目前提取植被信息较好的植被指数。标准化差值植被指数(NDVI)、土壤调节植被指数(SAVI)和垂直植被指数(PVI)分别适用于高密度、中等密度和稀少植被地区植被信息的提取和监测。各种植被指数多时象累加产生的图像能较好地提取植被信息 相似文献
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Mingzhu Luo Rong Fan Xiaoming Wang Junyu Lu Ping Li Wenbin Chu Yonghe Hu Xuewei Chen 《Bioscience reports》2021,41(6)
Ethnopharmacological relevance: Gualou Xiebai Banxia (GLXBBX) decoction is a well-known traditional Chinese herbal formula that was first discussed in the Synopsis of the Golden Chamber by Zhang Zhongjing in the Eastern Han Dynasty. In traditional Chinese medicine, GLXBBX is commonly prescribed to treat cardiovascular diseases, such as coronary heart disease and atherosclerosis.Objective: The present study aimed to examine GLXBBX’s preventative capacity and elucidate the potential molecular mechanism of Poloxamer 407 (P407)-induced hyperlipidemia in rats.Materials and methods: Both the control and model groups received pure water, and the test group also received a GLXBBX decoction. For each administration, 3 ml of the solution was administered orally. To establish hyperlipidemia, a solution mixed with 0.25 g/kg P407 dissolved in 0.9% normal saline was injected slowly into the abdominal cavity. At the end of the study, the rats’ plasma lipid levels were calculated using an automatic biochemical analyzer to evaluate the preventative capability of the GLXBBX decoction, and the serum and liver of the rats were collected.Results: The GLXBBX decoction significantly improved P407-induced hyperlipidemia, including increased plasma triglycerides (TGs), aspartate aminotransferase (AST) elevation, and lipid accumulation. Moreover, GLXBBX decoction treatment increased lipoprotein lipase (LPL) activity and mRNA expression of LPL. Furthermore, GLXBBX significantly suppressed the mRNA expression of stearoyl-CoA desaturase (SCD1).Conclusion: GLXBBX significantly improved P407-induced hyperlipidemia, which may have been related to enhanced LPL activity, increased LPL mRNA expression, and decreased mRNA expression of SCD1. 相似文献
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Biotechnology Letters - 相似文献
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花青素转录因子调控机制及代谢工程研究进展 总被引:2,自引:0,他引:2
花青素是广泛存在于植物中的一类重要的类黄酮化合物, 在植物生长发育和人类营养保健方面具有重要价值。花青素的生物合成途径已经解析得比较清楚, 但花青素的代谢调控网络还在不断完善。调控花青素生物合成的转录因子主要包括MYB、bHLH和WD40三大类, 这些转录因子通过激活或抑制CHS、ANS和DFR等花青素途径关键结构基因的表达水平, 进而决定花青素积累的部位与水平。该文结合国内外花青素生物合成与转录调控方面的研究进展, 简要介绍了花青素的生物合成途径, 归纳总结了模式植物中花青素代谢调控的分子机理, 尤其是MYB、bHLH和WD40三类主要转录因子的调控机理, 以及这些转录因子在观赏植物和水果等经济作物花青素代谢工程中的应用。该文将为系统阐明花青素的转录调控机制和利用代谢工程改良花青素的相关研究提供有益参考。 相似文献
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Luoyu Wu Zhili Yuan Pengwei Wang Xuewei Mao Mingguo Zhou Yiping Hou 《Molecular Plant Pathology》2022,23(4):489-502
Fusarium graminearum, as the causal agent of Fusarium head blight (FHB), not only causes yield loss, but also contaminates the quality of wheat by producing mycotoxins, such as deoxynivalenol (DON). The plasma membrane H+-ATPases play important roles in many growth stages in plants and yeasts, but their functions and regulation in phytopathogenic fungi remain largely unknown. Here we characterized two plasma membrane H+-ATPases: FgPMA1 and FgPMA2 in F. graminearum. The FgPMA1 deletion mutant (∆FgPMA1), but not FgPMA2 deletion mutant (∆FgPMA2), was impaired in vegetative growth, pathogenicity, and sexual and asexual development. FgPMA1 was localized to the plasma membrane, and ∆FgPMA1 displayed reduced integrity of plasma membrane. ∆FgPMA1 not only impaired the formation of the toxisome, which is a compartment where DON is produced, but also suppressed the expression level of DON biosynthetic enzymes, decreased DON production, and decreased the amount of mycelial invasion, leading to impaired pathogenicity by exclusively developing disease on inoculation sites of wheat ears and coleoptiles. ∆FgPMA1 exhibited decreased sensitivity to some osmotic stresses, a cell wall-damaging agent (Congo red), a cell membrane-damaging agent (sodium dodecyl sulphate), and heat shock stress. FgMyo-5 is the target of phenamacril used for controlling FHB. We found FgPMA1 interacted with FgMyo-5, and ∆FgPMA1 showed an increased expression level of FgMyo-5, resulting in increased sensitivity to phenamacril, but not to other fungicides. Furthermore, co-immunoprecipitation confirmed that FgPMA1, FgMyo-5, and FgBmh2 (a 14-3-3 protein) form a complex to regulate the sensitivity to phenamacril and biological functions. Collectively, this study identified a novel regulating mechanism of FgPMA1 in pathogenicity and phenamacril sensitivity of F. graminearum. 相似文献
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Chen Weijian Cai Xuetong Ji Luyang Li Xiao Wang Xuewei Zhang Xiaoran Gao Yajing Feng Fude 《Photosynthesis research》2019,142(2):169-180
Photosynthesis Research - Inspired by the bioinorganic structure of natural [FeFe]-hydrogenase ([FeFe]-H2ase) that possesses iron sulfur clusters to catalyze proton reduction to hydrogen (H2), we... 相似文献