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   1348篇
  免费   175篇
  国内免费   12篇
耳鼻咽喉   13篇
儿科学   59篇
妇产科学   12篇
基础医学   185篇
口腔科学   27篇
临床医学   124篇
内科学   290篇
皮肤病学   16篇
神经病学   130篇
特种医学   102篇
外科学   171篇
综合类   50篇
预防医学   172篇
眼科学   12篇
药学   96篇
中国医学   1篇
肿瘤学   75篇
  2022年   14篇
  2021年   23篇
  2020年   8篇
  2019年   25篇
  2018年   29篇
  2017年   12篇
  2016年   23篇
  2015年   13篇
  2014年   27篇
  2013年   45篇
  2012年   52篇
  2011年   70篇
  2010年   34篇
  2009年   31篇
  2008年   46篇
  2007年   64篇
  2006年   44篇
  2005年   72篇
  2004年   60篇
  2003年   70篇
  2002年   75篇
  2001年   55篇
  2000年   53篇
  1999年   34篇
  1998年   35篇
  1997年   26篇
  1996年   18篇
  1995年   17篇
  1994年   20篇
  1993年   20篇
  1992年   43篇
  1991年   29篇
  1990年   35篇
  1989年   27篇
  1988年   27篇
  1987年   20篇
  1986年   23篇
  1985年   21篇
  1984年   17篇
  1983年   10篇
  1982年   16篇
  1980年   11篇
  1979年   9篇
  1977年   9篇
  1976年   11篇
  1975年   11篇
  1969年   9篇
  1968年   9篇
  1967年   8篇
  1966年   11篇
排序方式: 共有1535条查询结果,搜索用时 31 毫秒
1.

Female Genital mutilation/cutting (FGM/C) is associated with enduring psychiatric complications. In this study, we investigate the rates of co-morbid abuses and polyvictimization experienced by survivors of FGM/C. This is a sub-analysis of a cohort study examining the patient population at the EMPOWER Center for Survivors of Sex Trafficking and Sexual Violence in New York City. A retrospective chart-review of electronic medical records was conducted for all consenting adult patients who had FGM/C and had an intake visit between January 16, 2014 and March 6, 2020. Of the 80 participants, ages ranged from 20 to 62 years with a mean of 37.4 (SD?=?9.1) years. In addition to FGM/C, participants were victims of physical abuse (43; 53.8%), emotional abuse (35; 43.8%), sexual abuse (35; 43.8%), forced marriage (20; 25%), child marriage (13; 16.3%), and sex trafficking (1; 1.4%). There was a high degree of polyvictimization, with 41 (51.2%) experiencing 3 or more of the aforementioned abuses. Having FGM/C on or after age 13 or having a higher total abuse score was also found to be strong predictors of depression and PTSD. The high rates of polyvictimization among survivors of FGM/C are associated with development of depression and PTSD. Despite co-morbid abuses, patients still attribute substantial psychiatric symptoms to their FGM/C. Health care providers should understand the high risk of polyvictimization when caring for this patient population.

  相似文献   
2.
3.
The regulation of toxic substances present in the environment requires that carcinogens be distinguished from noncarcinogens on the strength of the available toxicological and epidemiological evidence for carcinogenicity. In this article, we consider the difficulties associated with establishing strong evidence against carcinogenicity. In particular, the ability of both animal and human studies to detect small increases in tumor occurrence rates is evaluated in statistical terms. Consideration is also given to resolving apparent conflicts between the toxicological and the epidemiological sources of data.  相似文献   
4.
A national hospital/community model protocol was developed for the forensic and medical examination of victims of sexual assault. This review is designed to assist states in the development of sexual assault protocols. Controversial issues were addressed, including the collection of hair evidence, the importance of semen, mandatory reporting, pregnancy testing and prophylaxis, and sexually transmitted diseases including human immunodeficiency virus. The current role of DNA profiling is reviewed. These issues at the interface of medicine, forensic science, victim advocacy, and the law are analyzed. Representatives of the medical, legal, law enforcement, victim advocacy, and forensic science communities contributed to the development of the protocols at the national and state levels. The importance of a collaborative effort is emphasized. The broad protocol goals are to minimize the physical and psychological trauma to the victim while maximizing the probability of collecting and preserving physical evidence for potential use in the legal system.  相似文献   
5.
Adult Ixodes scapularis Say were collected weekly during two fall-winter-spring seasons from 1989 to 1991 to assess their temporal and spatial distribution as well as the effects of several meteorologic parameters on questing activity. Collections were made in three 0.4-ha sites in central Mississippi by flagging vegetation with a white flannel cloth. Adult I. scapularis were collected from 25 October through 11 April during the 1989-1990 season and 24 October-1 April in the 1990-1991 season. Peak I. scapularis questing activity occurred on 5 February and 4 February during the two seasons, respectively. Ticks were collected most often at approximately 20 degrees C but seven were collected on a day when the temperature was 6.9 degrees C. Ticks were clustered within the study sites and not evenly distributed. Most I. scapularis were collected from Ligustrum sinense and Chasmanthium sessiliflorum at a height of 31-40 cm. Statistical analyses of the meteorologic factors that affect questing activity are presented and discussed.  相似文献   
6.
Acute arsenic intoxication may present as Landry-Guillain-Barré syndrome because of similarities in clinical symptoms involving the gastrointestinal tract, weakness, and sensory symptoms. Electrodiagnostic findings may be similar with demyelinating changes predominating early in both diseases. A case is presented of repeated arsenic poisoning over two years misdiagnosed as Landry-Guillain-Barré syndrome. Proximal F-loop latency (M-wave latency at wrist + F-wave latency at wrist - 2 M-wave latency at axilla) helped to establish the correct diagnosis. Serial electrodiagnostic studies were done documenting the evolution of chronic repeated arsenic poisoning from a picture showing demyelination to one with severe axonal loss.  相似文献   
7.
Helms  CA; Kaban  LB; McNeill  C; Dodson  T 《Radiology》1989,172(3):817-820
Magnetic resonance (MR) imaging has been used in the temporomandibular joint (TMJ) primarily to define the disk position. This report examines altered morphology and signal intensity characteristics of the TMJ disk as they relate to the severity of internal derangement. Two hundred sixteen joints in 133 patients with a history of such derangement. were imaged with MR. Disk position, signal intensity, morphology, and the presence of osteoarthritis were determined for each joint. The normal disk was not anteriorly displaced and had a normal "bow-tie" shape. A grade 1 disk was anteriorly displaced and had a normal shape; a grade 2 disk was anteriorly displaced and had an abnormal shape. Forty (19%) joints were considered normal; none of these exhibited osteoarthritis. One hundred thirty-nine (64%) joints were grade 1; osteoarthritis was found in 17%. Thirty-seven (17%) were grade 2; osteoarthritis was found in 95%. All forty normal joints had high or intermediate signal intensity in the disk. Osteoarthritic joints had a higher percentage of disks with diminished intensity (P less than .0001). Severe or untreated osteoarthritis is known to be a complication of TMJ internal derangements; hence this grading system seems to correlate with the severity of internal derangement.  相似文献   
8.
Partial duplications of 10p and 13q in association with partial deletions of other chromosome segments have been variously reported. We describe here a female child with multiple congenital abnormalities and combined partial duplications of 10p and 13q resulting from a 3:1 segregation of a maternal t(10;13)(p13;q22). In comparing the phenotypic features of the two chromosome imbalances, the expression of features typical of partial duplication 10p appeared more pronounced.  相似文献   
9.
10.
A minority of individuals infected with the parasite Schistosoma mansoni develops hepatic fibrosis. HLA studies in Egypt and a candidate gene search in a Sudanese population indicate that the host's genetics contribute to disease susceptibility. In an Egyptian community, 32.7% of individuals 11 years and older had significant fibrosis by WHO ultrasound criteria. Linkage to 10 candidate genes was tested using 89 affected sibling pairs from 40 pedigrees in this community. The candidates included genes that initiate fibrosis, participate in collagen synthesis, or control collagen degradation. Two to four single-nucleotide polymorphisms (SNPs) were genotyped per locus, and 188 individuals were genotyped at 48 markers. Model-free modified Haseman-Elston analysis identified linkage to a SNP in the interferon gamma receptor locus (P=0.000001). There was also weak evidence for linkage to the interleukin 13-4 region and tissue growth factor beta 1.  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