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   6692篇
  免费   379篇
  国内免费   21篇
  7092篇
  2024年   11篇
  2023年   94篇
  2022年   248篇
  2021年   354篇
  2020年   330篇
  2019年   477篇
  2018年   368篇
  2017年   261篇
  2016年   346篇
  2015年   370篇
  2014年   456篇
  2013年   581篇
  2012年   538篇
  2011年   538篇
  2010年   284篇
  2009年   245篇
  2008年   268篇
  2007年   273篇
  2006年   238篇
  2005年   196篇
  2004年   146篇
  2003年   106篇
  2002年   97篇
  2001年   16篇
  2000年   14篇
  1999年   19篇
  1998年   20篇
  1997年   16篇
  1996年   14篇
  1995年   6篇
  1994年   7篇
  1993年   12篇
  1992年   6篇
  1991年   14篇
  1990年   5篇
  1989年   10篇
  1988年   4篇
  1987年   12篇
  1986年   12篇
  1985年   13篇
  1984年   12篇
  1983年   8篇
  1982年   6篇
  1981年   5篇
  1980年   6篇
  1976年   3篇
  1974年   7篇
  1973年   3篇
  1963年   2篇
  1962年   2篇
排序方式: 共有7092条查询结果,搜索用时 0 毫秒
31.
Microbial hydroxylation of progesterone occurred in the culture of Acremonium strictum PTCC 5282 to produce two hydroxylated pregnene-like steroids. The metabolites were purified and characterized using spectroscopic methods and identified as 15alpha-hydroxyprogesterone and 15alpha-hydroxydeoxycorticosterone.  相似文献   
32.
Five cyanobacterial species (Phormidium sp., Nostoc sp., Anabaena sp. Aphanothece conferta, and Synechocystis aquatilis) isolated from the Suez Canal coast at the city of Ismailia (Egypt) were tested for biodegradation of four hydrocarbon (HC) compounds: two aliphatic compounds (n‐octadecane and pristine) and two aromatic compounds (phenanthrene and dibenzothiophene). High degradation efficiencies for the two aliphatic compounds were measured for A. conferta (64% for n‐octadecane and 78% for pristine) and S. aquatilis (85% for n‐octadecane and 90% for pristane). However, the other biodegradation percentages ranged between weak and moderate percentages.  相似文献   
33.
Seven hundred and thirty-five diarrhoeic faecal samples from children were investigated for presence of enteroaggregative E. coli (EAEC), enterotoxigenic E. coli (ETEC), diffusely adherent E. coli (DAEC) and Salmonella spp. by polymerase chain reaction (PCR) and bacterial culture. Out of 675 samples from Kashmir, 55 isolates were obtained, which carried at least one virulence gene studied. Out of the 55 isolates, 36 (65.45%) were EAEC, 18 (32.72%) were ETEC while only one isolate (1.81%) was DAEC. All the EAEC isolates were found to be typical as they possessed aggR gene. Six (16.66%) EAEC isolates carried the astA gene. Out of the 18 ETEC isolates, 13 carried the elt gene alone, four possessed both the elt and est genes and the remaining one harboured the est gene alone. Five ETEC isolates also possessed astA gene. Nineteen EAEC isolates belonged to 10 different serogroups. Serogroup O153 was most frequent. The ETEC isolates also belonged to 10 different serogroups of which O159 was most predominant. Out of 224 E. coli isolates from 60 samples of Secunderabad, 27 isolates carried at least one virulence gene. Out of 27 isolates 22 (81.48%) were typical EAEC, three (11.11%) were ETEC and two (7.4%) were DAEC. Fifteen EAEC isolates belonged to seven different serogroups with O86 as most frequent. Four EAEC isolates also possessed the astA gene. All the three ETEC isolates harboured elt gene only and belonged to three different serogroups. Two isolates of Salmonella Worthington were obtained from only two samples in Kashmir.  相似文献   
34.
35.
36.
37.
International Journal of Peptide Research and Therapeutics - Natural compounds extracted from marine organisms consisting of biological active materials like collagen provide a major source of...  相似文献   
38.
Mycopathologia - Fungi of the genus Fusarium are well known as major plant pathogens but also cause a broad spectrum of human infections. Sixty-three clinical isolates, collected during...  相似文献   
39.
Diarrhea is considered as an important cause of morbidity and mortality, even though one of the main reasons of death following diarrhea is initiated by dysentery. In recent years, the consumption of probiotics has been proposed for the treatment of infectious diarrhea. Despite most of the studies on probiotics have focused on acute watery diarrhea, few studies in the field of dysentery have found beneficial effects of probiotics. This study is a randomized double-blind clinical trial. The patients were randomly placed into control and case groups. In the intervention group, the patients received probiotics in the form of Kidilact® sachet, which contained high amounts of 7-strain friendly bacteria strains of Lactobacillus casei, Lactobacillus acidophilus, Lactobacillus rhamnosus, Lactobacillus bulgaricus, Bifidobacterium infantis, Bifidobacterium breve, and Streptococcus thermophiles. On the other hand, the patients in the control group received placebo sachets on a daily basis for 5 days. It is notable that the treatment protocol of acute dysentery was done on both groups. The results of this study showed significant differences in the duration of blood in diarrhea between probiotic consumers (2.62 days) and the control group (3.16 days) (P value = 0.05). Additionally, significant differences in the average length of hospitalization in probiotic consumers (3.16 days) and control (3.66 days), (P value = 0.02) could be claimed that the consumption of probiotics is effective in reducing the duration of dysentery and diarrhea. The results of this study suggest that the use of probiotics can be effective in reducing the duration of blood in diarrhea. This study was also recorded in the Iran center of clinical trials registration database (IRCT2014060617985N1).  相似文献   
40.
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