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   1921篇
  免费   120篇
  国内免费   8篇
耳鼻咽喉   15篇
儿科学   240篇
妇产科学   13篇
基础医学   203篇
口腔科学   38篇
临床医学   80篇
内科学   326篇
皮肤病学   37篇
神经病学   158篇
特种医学   25篇
外科学   221篇
综合类   36篇
预防医学   126篇
眼科学   217篇
药学   174篇
中国医学   9篇
肿瘤学   131篇
  2023年   10篇
  2022年   44篇
  2021年   69篇
  2020年   33篇
  2019年   34篇
  2018年   51篇
  2017年   44篇
  2016年   49篇
  2015年   64篇
  2014年   93篇
  2013年   103篇
  2012年   137篇
  2011年   149篇
  2010年   92篇
  2009年   72篇
  2008年   103篇
  2007年   113篇
  2006年   101篇
  2005年   92篇
  2004年   82篇
  2003年   72篇
  2002年   67篇
  2001年   42篇
  2000年   47篇
  1999年   54篇
  1998年   23篇
  1997年   16篇
  1996年   9篇
  1995年   10篇
  1994年   16篇
  1993年   8篇
  1992年   12篇
  1991年   22篇
  1990年   24篇
  1989年   19篇
  1988年   12篇
  1987年   11篇
  1986年   4篇
  1985年   5篇
  1984年   4篇
  1982年   4篇
  1979年   4篇
  1977年   2篇
  1974年   2篇
  1973年   2篇
  1971年   5篇
  1969年   2篇
  1966年   2篇
  1964年   2篇
  1942年   2篇
排序方式: 共有2049条查询结果,搜索用时 15 毫秒
1.
Treatment guidelines for management of uncomplicated gonorrhoeae have been recently modified owing to alarming upsurge in azithromycin resistance. This study investigated the prevalence and genetic determinants of gonococcal azithromycin resistance in India. Four (5.7%) of 70 gonococcal isolates were resistant to azithromycin. Of 16 isolates investigated for molecular mechanisms of resistance, 13 (81.3%) and 6 (37.5%) isolates exhibited mutations in coding and promoter regions of mtrR gene, respectively. However, ermA, ermB and ermC genes or mutations in rrl gene were absent in all isolates. Azithromycin resistance is low in India posing no immediate threat to use of dual-therapy for syndromic management.  相似文献   
2.
The present study revealed that the majority of nurses had adequate knowledge about dietary practices during the antenatal and post-natal period. However, their knowledge about nutritive value of foods and nutrition advice during disease conditions was inadequate. It is recommended that to make the training more meaningful, the identification of the incorrect dietary beliefs of trainees should be done at the beginning of the training course. Each incorrect belief should be explained in detail for better comprehension of the correct knowledge in nutrition.  相似文献   
3.
In the present study, chlorogenic acid (CGA) isolated from Anthocephalus cadamba was screened for hepatoprotective activity by in vitro and in vivo assay methods using carbon tetrachloride (CCl4) as a model of liver injury. Intraperitoneal administration of CGA to mice at a dose of 100 mg/kg body weight for 8 days caused significant reversal in lipid peroxidation, enzymatic leakage, cytochrome P450 (Cyt P450) inactivation and produced enhancement of cellular antioxidant defence in CCl4-intoxicated mice, revealing that the antioxidative action of CGA is responsible for its liver protective activity. CGA exhibited a better therapeutic protective action than silymarin (SM), in CCl4-administered mice.  相似文献   
4.
Background: The fabrication of dental prosthesis requires the transfer of interocclusal records from patient's mouth to semiadjustable articulators using different kinds of recording media. Any inaccuracy in these interocclusal records leads to occlusal errors in the final prosthesis. This study was conducted to evaluate the dimensional changes occurring in the interocclusal recording material over a given period of time and the material's resistance to compression during the cast mounting on the articulator.  相似文献   
5.
6.
Pseudomonas aeruginosa commonly colonizes the airways of patients with cystic fibrosis (CF). However, the occurrence of bacteremia with metastatic infection to the eye causing endogenous endophthalmitis is very rare. In the setting of lung transplantation, the significance of P. aeruginosa bacteremia in patients with CF whose airways are colonized before transplantation is unknown. We report a case of bilateral P. aeruginosa endogenous endophthalmitis in a patient with CF after lung transplant without documented bacteremia. The patient presented with acute eye symptoms in the presence of a left atrial thrombus and the disease followed a rapidly progressive course requiring aggressive medical-surgical treatment. Typically P. aeruginosa endophthalmitis has been associated with a poor visual prognosis. However, with combined medical-surgical management this patient retained useful vision in one eye without having retinal detachment or requiring enucleation. Endogenous endophthalmitis should be considered in the differential diagnosis of ocular complaints in patients with CF after lung transplant.  相似文献   
7.
8.
Nonmotor symptoms (NMS) of Parkinson's disease (PD) are not well recognized in clinical practice, either in primary or in secondary care, and are frequently missed during routine consultations. There is no single instrument (questionnaire or scale) that enables a comprehensive assessment of the range of NMS in PD both for the identification of problems and for the measurement of outcome. Against this background, a multidisciplinary group of experts, including patient group representatives, has developed an NMS screening questionnaire comprising 30 items. This instrument does not provide an overall score of disability and is not a graded or rating instrument. Instead, it is a screening tool designed to draw attention to the presence of NMS and initiate further investigation. In this article, we present the results from an international pilot study assessing feasibility, validity, and acceptability of a nonmotor questionnaire (NMSQuest). Data from 123 PD patients and 96 controls were analyzed. NMS were highly significantly more prevalent in PD compared to controls (PD NMS, median = 9.0, mean = 9.5 vs. control NMS, median = 5.5, mean = 4.0; Mann-Whitney, Kruskal-Wallis, and t test, P < 0.0001), with PD patients reporting at least 10 different NMS on average per patient. In PD, NMS were highly significantly more prevalent across all disease stages and the number of symptoms correlated significantly with advancing disease and duration of disease. Furthermore, frequently, problems such as diplopia, dribbling, apathy, blues, taste and smell problems were never previously disclosed to the health professionals.  相似文献   
9.
A declining trend of breast feeding (BF) was noticed in the early 1970s, but a decade of intensive campaigning by national and international agencies for BF has reversed this. The objective of the present study was to assess the knowledge and attitude amongst teachers before launching an orientation course in maternal and child health care for them. A structured questionnaire was administered to 62 married women teachers of middle socioeconomic background and education. 98% of mothers knew that breast milk was the nutrition of choice up to 4-5 months of age, and 94% mentioned that BF should be started immediately after birth. 94% of subjects knew that colostrum should be given, 95% were aware that protective substances were present in breast milk. 61% were cognizant of the need to continue BF as long as possible. 92% of the subject knew about improved mother-infant bonding owing to BF. Only 60% knew that lactation provided complete protection against pregnancy during the first 4 months. 615 of the mothers deemed BF in public embarrassing. All subjects were aware that unhygienic bottle feeding caused diarrhea, whereas BF offered protection. Many of them felt that BF should be stopped when the mother had tuberculosis (16%), malaria (55%), and diarrhea (60%). 65% of mothers had misconceptions that diluted top milk should be given even after 4 months of age, while 35% were mistaken that commercial preparations of milk were more nutritious than breast milk. 76% had the erroneous knowledge that high consumption of almonds, cashew nuts and other dried fruits increased the volume of breast milk. 94% of the teachers knew that the child should get colostrum, and almost 37% felt that bottle feeding should be entirely avoided. These results point to the urgent need of starting nutrition education programs for working mothers.  相似文献   
10.
Abstract: We performed a retrospective analysis of clinical course of 91 patients who developed both breast cancer and a chronic lymphoproliferative neoplasm and were seen at the M. D. Anderson Cancer Center between January 1, 1970 and December 30, 1991. The sample included 24 individuals who developed lymphoproliferative neoplasm first (Group A), 22 individuals with concurrent diagnosis of both malignancies (Group B), and 45 individuals who developed breast cancer first (Group C). The median time to diagnosis of secondary breast cancer and lymphoproliferative neoplasm was 66 months (range, 7–459) and 65 months (range, 0–334), respectively. A higher proportion of Group B lymphomas were low-grade (77% vs. 47% [Group A] vs. 37% [Group C] p = 0.009). Prior occurrence of either one of these malignancies did not affect the disease-specific survival from the second malignancy. However, continuing mortality from the first malignancy appeared to contribute to a poor overall survival following second malignancy. Group A included 8 patients who developed breast cancer following radiation therapy for Hodgkin's disease after a mean interval of 18 (± 4.3) years. Three of these individuals had coexisting ductal and lobular histology (vs. none of the individuals in Groups B and C, p = 0.02). Another interesting finding was the high incidence of multiple additional malignancies in this patient population. A total of 29 additional neoplasms occurred in 21 (23%) of the 91 study subjects. These malignancies involved a wide variety of organ sites and could not be attributed to the therapy for either the breast cancer or the lymphoma in most cases. The data suggest that individuals who develop both breast cancer and a lymphoproliferative neoplasm are at a high risk for multiple malignancies. Close surveillance of such individuals for additional malignancies and further studies to understand the molecular basis of this predisposition are warranted.?  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