中国喜马拉雅地区的主要蜜源植物研究   总被引：1，自引：0，他引：1  

匡邦郁  匡海鸥 《云南农业大学学报(自然科学版)》1999,14(3):294-299

 系统介绍了中国喜马拉雅地区,包括西藏南部和东部、四川西南部、云南西部的蜜源植物资源概况,主要蜜、粉源植物118种的开花期和利用价值,为这一地区发展养蜂业,振兴山区经济,促进农、林业持续发展提供科学依据。  相似文献   

通江湖泊石臼湖鱼类群落结构现状及其季节变化     

贺婉路  刘鹏飞  詹政军  徐东坡  任泷  匡箴  景丽 《中国水产科学》2021,28(6):728-736

石臼湖是长江下游唯一的自然通江湖泊, 为掌握其鱼类资源状况, 本研究于 2017 年 1 月至 2018 年 3 月采用多目刺网和定制串联笼壶采集石臼湖渔获物, 分析了石臼湖鱼类群落结构及其季节变化。结果显示, 共采集到鱼类 36 种, 隶属于 6 目 7 科 28 属, 其中鲤科鱼类最多, 占总物种数的 69.44%; 鱼类物种组成以定居性、杂食性、中上层鱼类为主, 小型鱼类达 25 种, 占总物种数的 69.44%。似鱎(Toxabramis swinhonis)、刀鲚(Coilia nasus)和鲫 (Carassius auratus)为石臼湖鱼类全年优势种; 除全年优势种外, 季节特有优势种有春季的麦穗鱼(Pseudorasbora parva)、夏季的翘嘴鲌(Culter alburnus)和?(Hemiculter leucisculus)、秋季的似鳊(Pseudobrama simoni)、冬季的贝氏?(Hemiculter bleekeri)。鱼类相对密度、相对生物量有较大的季节变化, 但其变化趋势一致, 均按照冬季、春季、 秋季、夏季由高到低排列。Margalef 丰富度指数 R 的变动范围为 2.28~3.17, 基于个体数量的 Shannon-Wiener 多样性指数 H_N′ 、Pielou 均匀度指数 J_N′ 变动范围分别为 1.24~2.14、0.14~0.34, 基于生物量的 Shannon-Wiener 多样性指数 H_W′ 、Pielou 均匀度指数 J_W′ 变动范围分别为 1.64~2.51、0.21~0.49, 各指数除 H_W′ 在夏秋季间差异不显著外, 其余指数夏季都显著高于其他季节(P<0.05)。研究结果表明, 石臼湖鱼类种类较少, 多样性偏低。本研究补充了通江湖泊鱼类群落研究的基础资料, 对长江中下游鱼类多样性保护具有一定的意义。  相似文献   

农田信息自动采集仪     

匡迎春  肖名涛 《农机化研究》2010,32(8)

为了准确、可靠和实时地获取农田信息,设计了一种田间数据自动采集仪.将采集板放置于田间检测各种田间参数,并通过无线技术传送给PC机,由PC机对数据进行处理,以图表形式提供给用户.试验表明,农田信息自动采集仪具有采集精度高、传输准确率高和操作简易方便等特点,体现出较好的实用性.  相似文献   

Transcriptome analysis reveals the influence of anaesthetic stress on the immune system of crucian carp (Carassius auratus) under the process of treatment and low concentration transport by MS‐222 and Eugenol     

Xiaohuan Cao  Yajun Wang  Na Yu  Qijun Le  Jiabao Hu  Yang Yang  Siwen Kuang  Man Zhang  Yibo Sun  Weiwei Gu  Xiaojun Yan 《Aquaculture Research》2019,50(11):3138-3153

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油茶19个高产新品种的选育研究   总被引：20，自引：4，他引：20       下载免费PDF全文

庄瑞林  黄爱珠  董汝湘  王德斌  陈永忠  蔡肖群  苏明媚  邓晓安  匡元玉  曾庆南  贾桂仁 《林业科学研究》1992,5(6):619-627

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抗草甘膦棉花种质湘X157在棉花简化制种中的应用初探     

彭凡嘉  巩养仓  周德桂  陈浩东  匡政成  张雪林  张学文 《中国棉花》2016,43(11):13-15

为了探讨草甘膦对棉花的杀雄效果,利用41%草甘膦异丙胺盐水剂对抗草甘膦棉花种质湘X157化学杀雄。结果表明：在草甘膦稀释50～100倍条件下,不同的喷药方式会影响花粉败育率,喷施全株能实现全株败育。高浓度草甘膦多次喷施会导致杂交不能正常成铃,说明草甘膦富集棉株内,对棉花雌蕊发育也有毒害作用。  相似文献   

丹翘灌注液抗炎镇痛作用的研究   总被引：1，自引：0，他引：1  

魏立琴  王东升  苗小楼  张世栋  董书伟  邝晓娇  杨志强  余四九  严作廷 《中国农学通报》2015,31(2):75-79

研究丹翘灌注液的抗炎镇痛作用。采用二甲苯致小鼠耳廓肿胀、棉球致小鼠肉芽肿、小鼠醋酸扭体反应、小鼠福尔马林致痛模型观察丹翘灌注液的抗炎和镇痛作用。40、20、10 g/kg的丹翘灌注液能不同程度的抑制二甲苯引起的小鼠耳廓肿胀、棉球引起的肉芽肿增生;不同程度的减少醋酸引起的小鼠扭体次数和福尔马林引起的舔足时间。结果表明,丹翘灌注液具有抗炎、镇痛的作用。  相似文献   

洞庭湖植棉区棉花生产全程机械化的实践     

匡政成  肖才升  陈浩东  李庠  张志刚  刘爱玉  曾爱平  李育强 《中国棉花》2015,42(5):10-11

通过对洞庭湖植棉区棉花种植现状进行分析,提出了洞庭湖植棉区棉花生产全程机械化的总体思路和机采棉初步标准;总结了近年来洞庭湖植棉区棉花生产全程机械化实践经验,对尚待解决的关键技术问题给出了相应的建议。  相似文献   

Catechin transformation as influenced by aluminum     

Chen YM  Wang MK  Huang PM 《Journal of agricultural and food chemistry》2006,54(1):212-218

Polyphenols (catechins) are vital biomolecules in tea plants (Camellia sinensis), which are well-known as typical Al accumulators. However, the interaction between Al and catechin remains obscured. The objective of the present study was to investigate the effect of Al on the transformation of (+)-catechin. Solutions with OH/Al molar ratios of 2.5 (pH 5.5) and 3.0 (pH 7.0) prepared at Al/catechin molar ratios (R) of 0, 0.2, 0.4, 0.6, 0.8, and 1.0 were aged for 7 and 30 days, respectively. The precipitates were collected and examined by wet chemistry, X-ray diffraction, transmission electron microscopy, electron spin resonance (ESR), cross-polarization magic angle (CPMAS) 13C nuclear magnetic resonance (13C NMR) analyses, and Fourier transformation infrared absorption spectrometry (FT-IR). The weight of the precipitates increased with increasing Al/catechin molar ratios and with prolonged aging. The molar ratios of Al/catechin in the precipitates increased with increasing initial Al/catechin molar ratios and were close to the initial solution Al/catechin molar ratios. The chemical analysis and spectroscopic studies indicated that Al was bonded with catechin, forming a 1:1 type complex. The reaction of crystalline catechin with Al resulted in the formation of X-ray noncrystalline precipitates. The solid-state CPMAS 13C NMR spectra of the precipitates show the change in chemical shifts of catechin as a result of catechin complexation with Al. The FT-IR spectra of the Al-catechin precipitates also show the loss of absorption bands of several functional groups compared with catechin. The FT-IR data substantiate this reasoning. The ESR spectra of the precipitates show a single symmetrical line devoid of any fine splitting, indicating the presence of free radicals of semiquinones, which are commonly present in humified materials.  相似文献   

Dammarane-type saponins from Panax quinquefolium and their inhibition activity on human breast cancer MCF-7 cells     

Ying-Kun Qiu  De-Qiang Dou  Li-Ping Cai  Hai-Ping Jiang  Ting-Guo Kang  Bing-You Yang  Hai-Xue Kuang  Michael ZC Li 《Fitoterapia》2009

A new compound, named quinquefoloside-L_c (1), together with nine known compounds, was isolated from leaves of Panax quinquefolium, and its structure was elucidated as 3β,12β,20S-trihydroxy-25-methoxydammar-23-ene 3-O-β-d-glucopyranosyl (1 → 2) β-d-glucopyranosyl-20-O-β-d-xylopyanosyl (1 → 6) β-d-glucopyranoside (1), on the basis of MS, 1D-and 2D-NMR experiments as well as by chemical degradation. The cytotoxicity of these compounds against human breast cancer MCF-7 cell line was also tested by MTT method.  相似文献