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药用植物黄精研究现状 总被引:1,自引:0,他引:1
从黄精生物学特性、应用价值和繁殖技术三方面阐述了现今黄精的研究现状,提出了现今我国黄精开发利用存在的问题.旨在为我国黄精的开发利用研究提供基础的研究资料. 相似文献
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黄精自古以来就是一种优良的药食两用资源,随着社会不断地发展,黄精产业面临着野生资源破坏严重、良种不足和精深加工产业不匹配等问题。为了黄精产业健康发展,本文从黄精生物学特征、种质资源及分布、黄精有效成分和功能活性4个方面介绍了黄精的研究现状,同时从黄精药用和食用价值、产业发展和发展策略对黄精产业进行了阐述,分析了黄精产业发展的现状以及产业发展过程中存在的问题,针对相关问题对黄精产业发展提出了解决方法,并对黄精未来发展模式提出了展望,旨在为黄精产业高质量发展提供参考。 相似文献
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通过对多花黄精林下栽培研究的系统回顾,综述了多花黄精的良种繁育和栽培模式方面的研究进展,并提出了今后林下套种多花黄精的研究方向。 相似文献
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本文简述了凤凰县野生黄精资源的分布情况及其生态习性,重点从市场前景分析、建立野生黄精的引种驯化栽培示范基地、开展野生黄精快速繁殖研究、打造黄精加工链4个方面阐述了黄精开发利用对策,以期为当地黄精产业的合理开发利用提供参考。 相似文献
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对黄精多糖的脱色和脱蛋白工艺进行了研究,并研究了黄精多糖对羟基自由基、超氧阴离子的清除率和黄精多糖的总抗氧化活性.结果表明,1%双氧水对黄精多糖脱色效果好;而氯仿和正丁醇的体积比为6∶1时脱蛋白效果较好;经脱色和脱蛋白的黄精多糖能有效清除自由基和超氧阴离子,并具有良好的抗氧化作用,黄精多糖对羟自由基、超氧阴离子的抑制作用和总抗氧化活性随着样品浓度升高而增强. 相似文献
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为了改善玉竹Ploygonatum odordatum炮制品的质量,提高玉竹在药用或保健食品等方面的应用价值,在兼顾多糖、皂苷、总黄酮、醇溶物、水溶物和水分各指标的抗氧化活性和含量基础上,采用多指标综合评分法、层次分析法和正交试验法优化了玉竹的酒蒸炮制条件。玉竹最佳酒蒸炮制工艺为:酒润时间2.0 h,料液比100 ∶ 20(玉竹 ∶ 黄酒),酒蒸温度60 ℃,酒蒸时间1.0 h,其中料液比对各指标综合得分影响最显著。该方法操作简单、经济,有效提高了玉竹的利用率。图1表6参31 相似文献
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利用模拟技术比较不同遗传参数组合下比值性状的理论遗传力及其各选择强度下实现遗传力的差异,证明比值性状的遗传特性与一般正态数量性状不同,其实现遗传力随选择强度不同而呈有规律的顺序变化,并且这种变化受构成比值的两个分量性状的遗传力和遗传相关大小影响。Sutherland的理论遗传力同样不能有效地预测选择比值的遗传变化。反求指数法(IIR法)对直接选择比值的作用机制分析表明:不同选择强度下,作用于比值的两个分量性状上的相对选择压不同,呈非线性方式变化,由此造成比值实现遗传力的改变和遗传改进方式不一样。这些结果为深入认识比值性状的遗传特性和育种工作中有效地提高这类性状提供了依据。 相似文献
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按照河北省教育科学"十二五"规划课题要求,针对当今旅游市场对日语人才的需求情况,分析旅游产业和日语专业的特点,探讨职业院校旅游日语专业人才培养教学体系,提出复合应用型日语人才的培养模式,明确旅游行业中日语专业的教学任务和内容,为职业院校的教育改革提供参考。 相似文献
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为满足农资信息化发展的需求,针对农资销售监管等数据所具备的地理位置特征,提出基于WebGIS技术的农资信息服务与管理框架,综合运用ArcGIS API for JavaScript、Ajax和Dojo等技术手段,结合ArcGIS Server地图服务,开发农资信息服务与管理平台,以地图化的交互方式实现农资信息的展示、查询和管理功能,并在福建省安溪县农资管理中开展实际应用。该平台的构建为农资消费群体开辟信息查询的渠道,为生产销售厂商和监管部门提供数据管理工具,提升农资信息化服务水平。 相似文献
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本文从理论上和实践上第一次论证了林用架空索道导向滑车的滑轮选择系数“h_2”为14,从而为导向滑车的设计和制造提供了新的可靠依据。 相似文献
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This study provides empirical evidence on the link between economic growth and nutrition transition in two emerging economies, China and Russia. Both countries have experienced rising average incomes, accompanied by an increasing rate of nutrition-related chronic diseases in recent years. Given the regional heterogeneity between these two countries, we analyze the extent to which income growth as a major driver of nutrition transition has a significant effect on the consumption of different food aggregates and how these effects differ between Chinese and Russian consumers. Our results indicate that with increasing household incomes over time the demand for carbohydrates decreases, while the demand for meat and dairy products, as well as fruits increases. This is a development generally known as nutrition transition. Further, we estimate a Quadratic Almost Ideal Demand System(QUAIDS) for nine different food aggregates for China and Russia. Our results indicate that in both countries all food aggregates have positive expenditure elasticities and are thus normal goods. Moreover, our results indicate that in 2008/2009 meat is still a luxury good in China yet a necessity good in Russia. For 2009, the highest own-price elasticities in China are found for non-meat protein sources and dairy products. Within the meat group, beef, poultry and mutton have the highest price elasticities in China. In Russia, the milk and dairy group, together with the vegetable group, is the most price-elastic food group in 2008. In line with the definition of a nutrition transition, our overall results underscore the finding that income growth in China and Russia tends to increase the demand for animal-based products much stronger than, for example, the demand for carbohydrates. Despite being a positive signal for problems of malnutrition in rural China, this trend of increasing meat consumption might further increase the incidence of chronic diseases in urban areas since there is convincing scientific evidence that increasing meat consumption, especially red and processed meat, is associated with an increased risk of chronic diseases. 相似文献
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Modeling the Impacts of Soil Organic Carbon Content of Croplands on Crop Yields in China 总被引:1,自引:1,他引:0
QIU Jian-jun WANG Li-gang LI Hu TANG Hua-jun LI Chang-sheng Eric Van Ranst 《中国农业科学(英文版)》2009,8(4):464-471
This study quantified the impacts of soil organic carbon (SOC) content on the grain yield of crops using a biogeochemical model (DNDC, denitrification-decomposition). Data on climate, soil properties, and farming management regimes of cropping systems were collected from six typical agricultural zones (northeast, north, northwest, mid-south, east and southwest regions of China, respectively) and integrated into a GIS database to support the model runs. According to the model, if the initial SOC content in the cropland was increased by 1 g C kg^-1, the crop yield may be increased by 176 kg ha^-1 for maize in the northeast region, 454 kg ha^-1 for a maize-wheat rotation in the north region, 328 kg ha^-1 for maize in the northwest region, 185 kg ha^-1 for single-rice in the mid-south region, 266 kg ha^-1 for double-rice in east region, and 229 kg ha^-1 for rice and wheat rotation in southwest region. There is a great potential for enhancing the crop yield by improving the SOC content in each region of China. 相似文献