不是欧氏环的主理想环     

寇福来 《河北北方学院学报(自然科学版)》2003,(3)

介绍了一个不是欧氏环的主理想环的例子.  相似文献   

Feline serum amyloid A protein as an endogenous Toll-like receptor 4 agonist     

Takashi Tamamoto  Koichi OhnoYuko Goto-Koshino  Hajime Tsujimoto 《Veterinary immunology and immunopathology》2013

  相似文献   

用中医理论解析进补人参的养生之道   总被引：2，自引：2，他引：0  

宿延丽  罗晓萍  宿武林 《人参研究》2009,21(3):6-8

为使人参这一百草之王能走进千家万户,使之更好的提高我国人民的健康水平,拉动内需,促进人参产业可持续发展。本文揭力弘扬了中华人参文化,并通过用中医理论解析了在秋冬之季,进补人参的养生之道,举了应用人参保健的实例,阐述了祖国中医养生学的基本观点,其理论与方法是行之有效的。但要切记;凡火郁内实、肺热喘咳、邪气方锐,宜发不宜补。  相似文献   

高标准基本农田建设区域时序划分   总被引：9，自引：7，他引：2  

李发志  孙华  江廷美  朱高立  张建 《农业工程学报》2016,32(22):251-258

高标准基本农田建设是稳定中国耕地面积、保障粮食安全的重要措施。不同的地貌类型对高标准基本农田建设区划分的影响显著,对划分方法的要求也有所不同。该文以黄河冲积平原地区的商河县为研究区域,以耕地自然质量分等成果为基础,从耕地的自然质量、空间形态、基础设施等3方面构建高标准基本农田建设评价指标体系;以经纬网格为评价单元,采用熵权法修正指标权重,利用综合评价法对耕地的综合质量进行评价,并划分高标准基本农田的建设时序。研究结果表明,一、二、三、四级建设适宜区占耕地面积的比例分别为7.83%、69.10%、22.93%、0.14%,其中一、二级建设区主要分布于县域的北部和西部,三、四级建设区主要分布在县域的东南部;依据高标准基本农田建设的综合质量划分建设区域时序可以提高建设区划分的准确度,在耕地整体自然质量情况差异不显著时,耕地是否符合"与现在农业生产和经营方式相适应"的要求对高标准基本农田建设区优先度划分结果影响较大。研究结果为黄河冲积平原地区高标准基本农田建设区的划定具有一定的参考借鉴价值,并为相关研究的深入开展提供了新的研究思路。  相似文献   

鄯善县农用地分等成果在基本农田划定中的应用   总被引：3，自引：2，他引：1  

崔立军  高敏华 《中国农学通报》2014,30(17):125-130

要实现基本农田科学划定与管理,土地质量评价科技成果是其重要的技术支撑之一。在掌握鄯善县农用地分等成果中耕地的盐渍化程度、灌溉保证率、自然等别等信息基础上,借助GIS技术,筛选出优质耕地,与现状基本农田图斑进行叠加分析。结果显示,现状基本农田中存在着“保劣不保优”的现象,尚有部分质量较好的耕地可划入基本农田。实例研究表明,将农用地分等成果应用于基本农田划定工作可以简单、有效地为划定提供参考和依据,使基本农田划定更为科学合理。  相似文献   

东北低山丘陵区高标准农田区域划定及建设模式研究——以黑龙江省依兰县为例     

邢贺群  孟凡奎  苏里  李双异  汪景宽 《干旱地区农业研究》2015,33(3):231-237

基于东北地区高标准基本农田建设的理念,以依兰县为例,从耕地的自然禀赋和社会经济条件两方面选取10个指标,运用层次分析法和灰色关联分析法,对东北低山丘陵区高标准农田区域划定及建设模式进行研究。结果表明:依兰县存在耕地分布不平衡、耕地质量差、机械化水平低、农田防护林面积比例小、抵御自然灾害能力差等问题。依兰县高标准农田建设区域可分为最佳、适宜、有条件、无条件4种类型,其中最佳、适宜、有条件3种类型区的面积为196 200 hm2,占耕地总面积的70%。依兰县高标准农田建设模式可分为平原地力保育型、平原地力提升型、丘陵地力保育型、丘陵地力提升型4种类型,以实现耕地的相对集中连片,提高农业生产机械化水平,提高农田防护林覆盖率,提高耕作层厚度,提高土壤有机质含量,进而提升农业综合生产力。  相似文献   

Effect of ginger supplementation on developmental toxicity induced by fenitrothion insecticide and/or lead in albino rats     

Ahmed G.A. Farag  Hoda E.A. Farid 《Pesticide biochemistry and physiology》2010,97(3):267-274

Evaluation of the antioxidant and antiteratogenic role of ginger Zingiber officinale polyphenols against the toxicity induced by fenitrothion and/or lead in female albino rats were investigated. Adult virgin females were divided into 8 groups and were orally treated as follow: control (C), 1% w/w of ginger (G), 120 μg/animal lead as lead acetate (L), 10 mg/kg of fenitrothion (F), lead (120 μg/animal) fenitrothion (10 mg/kg) (LF), ginger (1%w/w) + fenitrothion (10 mg/kg) (GF), ginger (1%w/w) + lead (120 μg/animal) (GL), ginger (1%w/w) + lead (120 μg/animal) + fenitrothion (10 mg/kg) (GLF). Treatments were expanded for 28 days before pregnancy and during gestation period from zero to 6th day. Blood samples were taken at the day 20th of gestation and animals were sacrificed to investigate the effect of tested substances on dams and development of their fetuses. Inhibition in AchE in (F) and (LF) groups and elevation in plasma AchE in (L) groups were observed. Elevation in oxidative stress biomarker malondialdehyde (MDA) was recorded in all intoxicated groups concomitants with reduction in total reduced glutathione (GSH) and reduction in the activity of glutathione S-transferase (GST). Elevation in liver function biomarkers alanin amintransferase (ALT) and aspartate aminotransferase (AST) and reduction in plasma total protein and albumin were recorded in (F), (L) and (LF). Supplementation with ginger in diet attenuates the alteration in MDA, GSH, GST, ALT and AST, however, it failed to counteract the effect of F, L and LF on AchE, total protein and albumin. Significant alterations in maternal toxicity were recorded in (GF, GL, LF and GLF) compared with control group. Also, parameters of embryotoxicity and fetotoxicity indicated significant decrease in litter number that observed in F and L and the number of dead fetus/dam and litters number increased in L group. Supplementation with ginger decreased each of the number of died fetus, growth retardation and fetal length, while, it increased fetal weight. As regards to, teratological aspects, the percentage of skeletal malformations and visceral anomalies were observed in all feti obtained from treated groups with different percentages. Supplementation with ginger slightly attenuates the developmental toxicity of fenitrothion and/or lead.  相似文献   

新一轮土地利用总体规划中基本农田布局调整研究——以江西省浮梁县为例   总被引：2，自引：0，他引：2  

曹庆安  舒晓波  王雯  陈玉丽  傅小徐 《广东农业科学》2010,37(1):154-157

基本农田是一定时期人口和社会经济发展对农产品的需求,依据土地利用总体规划确定的不得占用的耕地。影响基本农田划定的因素包括自然、社会、经济等,选取坡度、自然等别和建设占用的影响因子,利用GIS软件进行空间分析提出了浮梁县基本农田空间布局和调整方案,并引入紧凑度指标进行验证,对浮梁县基本农田规划编制有一定的现实意义。  相似文献   

Characterization of yield,sensitivity to Botrytis cinerea and antioxidant content of several rose species suitable for edible flowers     

H. Friedman  O. Agami  Y. Vinokur  S. Droby  L. Cohen  G. Refaeli  N. Resnick  N. Umiel 《Scientia Horticulturae》2010

Yield, susceptibility to Botrytis and levels of antioxidants are important traits of fresh edible flowers. These parameters were determined for 12 garden rose cultivars selected as edible flowers: ‘Mount Shasta’, ‘San Francisco’, ‘Brandy’, ‘Maxim’, ‘Sweet Surrender’, ‘Amadeus’, ‘Eterna’, ‘Trier 2000’, ‘English sachet’, ‘Golden Celebration’, ‘Pat Austin’ and ‘Katharina Zeimet’. Yield of most cultivars ranged between 80 and 300 flowers/plant (for 64 weeks), which is higher than that produced by cultivars suitable for cut flowers. The yield makes the selected garden cultivars suitable for commercial growth as edible flowers.  相似文献   

非交换素环上导子为零导子的条件     

何俊杰 《信阳农业高等专科学校学报》2008,18(2):130-132

设R是一个特征不为2的非交换素环,d与g是R的两个导子。如果对任意的x∈R都有xdx-xxg∈Z(R),那么d=g=0。设R是一个6!-扭自由的非交换素环,如果存在环R的一个Jordan导子d使得对任意的x∈R都有x[xx,x]x=0,那么d=0.  相似文献