首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   42篇
  免费   2篇
林业   2篇
基础科学   5篇
  2篇
综合类   23篇
农作物   7篇
水产渔业   2篇
畜牧兽医   1篇
园艺   2篇
  2021年   1篇
  2020年   1篇
  2019年   1篇
  2017年   1篇
  2016年   3篇
  2015年   4篇
  2014年   3篇
  2012年   4篇
  2011年   2篇
  2010年   2篇
  2009年   1篇
  2008年   2篇
  2007年   1篇
  2006年   2篇
  2005年   2篇
  2004年   1篇
  2003年   1篇
  2002年   1篇
  2001年   1篇
  2000年   1篇
  1999年   1篇
  1998年   3篇
  1996年   1篇
  1995年   2篇
  1993年   1篇
  1992年   1篇
排序方式: 共有44条查询结果,搜索用时 15 毫秒
11.
多发性骨髓瘤(multiple myeloma,MM)是一种浆细胞恶性肿瘤,随年龄增长发病率升高,多经意义未明的单克隆免疫球蛋白血症(monoclonal gammopathy of undetermined significance,MGUS)发展而来。本文在前人经验基础上,提出了完整的肾虚血瘀证治思想;认为肾虚无制、瘀毒肆虐是MM发生的关键;提出了补肾阴、扶正气、破瘀毒、解症状基本治法,使MM恢复到MGUS状态。  相似文献   
12.
Drawn on the data col ected by surveying 1 340 urban households from six cities in China, this paper estimates the impacts of demographic structure and population aging on household meat consumption, b...  相似文献   
13.
乌龙茶做青过程脂质过氧化作用及其对茶叶品质的影响   总被引:5,自引:1,他引:4  
以肉桂品种鲜叶为原料,研究了做青强度对做青叶脂质过氧化作用和茶叶品质的影响。结果表明,摇青可以加速做青叶水分散失和可溶性蛋白质降解;摇青和自然萎凋均能促进MDA累积。在做青前期适当晒青和轻摇青可以提高SOD活力;重摇青降低SOD活力,进而O2.-产生速率加快,脂质过氧化加速,从而促进具有青草味的化合物散失,乌龙茶特征香气提高。  相似文献   
14.
采用电子鼻检测技术并结合感官审评,对3种不同萎凋工艺的山东红茶进行评价分析。通过传感器响应值的变化和数据统计分析表明:电子鼻技术对不同工艺的红茶均有较好的响应,可有效区分不同萎凋程度的红茶,且第7、9、2、6和8号传感器在红茶香气区分中起主要作用,即萜烯类和硫化物、芳香型化合物、氮氧化合物、醇类和烷类对茶叶香气贡献较大。这几种成分可能是引起山东不同季节红茶品质差异的主体成分。感官审评表明重萎凋工艺制得的山东红茶品质更佳。  相似文献   
15.
根据新时期高校安全保卫工作的新要求,重新定位当今高校保卫工作,提出高校安全工作要坚持预防为主,防治结合的原则.随着高等教育的事业的持续发展和高校内部的一系列政策的不断深化,安全稳定工作也遇到了许多新情况、新问题.分析了预防为主原则的概念、特点及重要性,阐述了预防为主的环境因素,并提出了预防为主的几点建议,使学校安全保卫...  相似文献   
16.
为丰富茶厂生产茶叶的种类,提高鲜叶原料的利用率,设计了一台能实现绿茶摊放、红茶萎凋以及乌龙茶做青的多功能茶鲜叶前处理机。阐述了该机的总体结构,包括机械传动系统、翻叶装置、通风与加热系统等核心部件的工作原理。采用多分支管道分层进风,确保风量的均匀性;高压小流量泵及微细喷头确保箱内湿度均匀;热源的分层设置,确保箱内温度均匀。试验表明,经过该机处理的茶叶制品,其理化指标和审评分数均高于对照组。运行结果表明,整机设计合理、运行可靠。  相似文献   
17.
Drawn on the data collected by surveying 1 340 urban households from six cities in China, this paper estimates the impacts of demographic structure and population aging on household meat consumption, by jointly considering meat consumed at home and away from home. Based on the trajectories of population, a simple simulation on meat demand trend in China is conducted subsequently. The results suggest: 1) Meat consumed away from home averagely accounts for near 30% of household total meat consumption in terms of quantity, so that its omission likely leads to a significant underestimate of total meat consumption and misunderstanding the driving forces; 2) population aging significantly and negatively affects per capita meat consumption, suggesting that the expected meat demand in China without considering population aging will be overestimated. The findings from this study have important implications for better understanding the relative issues on China's meat consumption under the situation of population aging.  相似文献   
18.
盐碱井灌稻区抛秧水稻生育性状及产量研究   总被引:8,自引:4,他引:4  
研究了水稻抛秧栽培技术在吉林省西部盐碱井灌区应用效果。试验结果表明,水稻抛秧栽培产量可达7683.8kg/hm^2,比旱育苗人工插秧提高8.8%,提早成熟5天,并具有秧苗素质好、分蘖多、成熟早、产量高、成本低、省工省时等优点,可解决盐碱冷浆寺区水稻插秧缓苗慢、插秧适期短等生产问题。  相似文献   
19.
Oxytetracycline (OTC) was recently demonstrated to be an effective therapeutant for California red abalone (Haliotis rufescens) infected with the agent of withering syndrome (WS), a Rickettsia-like prokaryote (WS-RLP). This study examined the influence of temperature on the efficacy and pharmacokinetics of oral OTC treatments on WS-RLP infected red abalone, H. rufescens. Medication was administered in an artificial diet containing 1.85% active OTC at a rate of 103.4 mg/kg abalone for 10, 20 and 30 days at both 13.4 °C and 17.3 °C. Drug residue concentrations, WS-RLP burden and WS-associated pathological changes within foot muscle and digestive gland were measured 3, 17, 23, 42, 63, 81, 102, 122, and 160 days after OTC treatment. In all samples the highest concentrations of OTC were detected on the first sample day. Furthermore, all sampling periods showed significantly less OTC in foot muscle samples relative to corresponding digestive gland samples (p < 0.001). While drug depuration occurred rapidly from foot muscle, unusually high concentrations and long depuration times were measured within the digestive gland. The pharmacokinetic trends in both the foot muscle and digestive gland at 13.4 °C were adequately described by a one-compartment model, while the digestive gland depuration models within the 17.3 °C treatments conformed to a two-compartment model. At both temperatures treatment duration gave rise to significant differences in OTC accumulation and depletion (p < 0.001). Despite this, terminal elimination rate constants were similar. Estimated half-lives were similar among all treatments for digestive gland (23.8–27.5 d) and all treatments for the foot muscle at 13.4 °C (10.7–13.4 d; calculated only for the 13.4 °C treatments). At both temperatures all three durations of drug treatment led to significant reductions in WS-RLP prevalence, foot muscle atrophy, and mortality. WS-RLP re-challenge trials initiated 44, 88, and 122 days following the 10-day treatment at 17.3 °C showed reduced susceptibility to re-infection for up to 88 days after treatment, suggesting that digestive gland OTC residues confer long-term resistance to pathogen. Atomic absorption spectroscopy conducted on both foot muscle and digestive gland found significantly higher concentrations of iron, zinc, and manganese in the digestive gland, offering an explanation behind the underlying mechanism of OTC retention for extended periods within this tissue.  相似文献   
20.
农村金融市场资金供给不足已成为我国新农村建设的制约因素,大量金融机构撤离农村,现代金融体系已无法适应农村经济的现状,新型的农村金融体系亟需建立。文章分析农村金融市场长期供给不足的原因,提出增强农村金融市场资金供给的一些建议。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号