抗草甘膦棉花种质湘X157在棉花简化制种中的应用初探

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。     

丹翘灌注液抗炎镇痛作用的研究

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。     

洞庭湖植棉区棉花生产全程机械化的实践

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。     

Catechin transformation as influenced by aluminum

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.     

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

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.     

生防菌株NJ-18的鉴定及其对几种植物病原真菌的拮抗作用研究

NJ-18是从油菜田土壤中分离筛选获得的一株具有抗真菌活性的细菌,本研究从形态和生理生化特征及16S rDNA序列分析,鉴定NJ-18菌株为枯草芽孢杆菌。经平板对峙试验表明,NJ-18发酵液对Sclerotinia sclerotiorum、Rhizoctonia solani、 Fusarium moniliforme、Magnaporthe grisea、F. graminearum、R. cerealis、 Alternaria solani、Botrytis cinerea and Fusarium oxysporum等九种植物病原真菌菌丝生长都具有良好的广谱抑菌活性;盆栽植株试验表明,NJ-18发酵液对小麦白粉病具有很好的保护和治疗作用,发酵原液的保护和治疗作用效果分别高达到96.1%和88.2%,发酵液稀释200倍后处理,对小麦白粉病的保护和治疗作用效果分别达到58.8%和51.4%。     

山西中南部盆地立地区立地类型的划分——山西立地类型划分与造林模式研究（Ⅸ）

分析了山西省中南部盆地的自然地理条件,按亚区的区划原则将该立地区分为忻太盆地立地亚区和晋南盆地立地亚区两个亚区,并根据立地类型小区、立地类型组和产地类型的划分原则将该立地区划分为4个立地类型小区,14个立地类型组和22个立地类型。     

云南农机信息查询系统的开发研究

农机信息查询是农机信息化的重要组成部分,是实现资源共享的重要举措,农机查询系统能够提供快速、高效的农机信息服务。为此,针对云南省农机信息化发展的现状以及农户对农机信息查询的需求,运用Ac-cess数据库软件,开发了云南农机信息查询系统。考虑用户群体主要是农业从业人员,应设计操作简单实用的用户界面,方便使用和查询。农机查询系统的开发与实现,可提升农机信息化服务水平,将有效提高农机的利用率,进一步推进云南省农业机械化和农业现代化进程。