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   636篇
  免费   42篇
  国内免费   1篇
耳鼻咽喉   1篇
儿科学   49篇
妇产科学   30篇
基础医学   64篇
口腔科学   16篇
临床医学   105篇
内科学   113篇
皮肤病学   49篇
神经病学   67篇
特种医学   3篇
外科学   55篇
预防医学   79篇
眼科学   7篇
药学   21篇
肿瘤学   20篇
  2023年   6篇
  2022年   6篇
  2021年   12篇
  2020年   14篇
  2019年   18篇
  2018年   24篇
  2017年   16篇
  2016年   28篇
  2015年   18篇
  2014年   26篇
  2013年   43篇
  2012年   55篇
  2011年   46篇
  2010年   29篇
  2009年   20篇
  2008年   37篇
  2007年   42篇
  2006年   42篇
  2005年   35篇
  2004年   30篇
  2003年   40篇
  2002年   34篇
  2001年   4篇
  2000年   2篇
  1999年   2篇
  1998年   5篇
  1997年   7篇
  1996年   4篇
  1995年   2篇
  1994年   3篇
  1993年   4篇
  1992年   3篇
  1990年   3篇
  1989年   1篇
  1988年   2篇
  1987年   2篇
  1985年   1篇
  1984年   2篇
  1983年   2篇
  1982年   1篇
  1981年   3篇
  1980年   1篇
  1979年   1篇
  1978年   1篇
  1967年   2篇
排序方式: 共有679条查询结果,搜索用时 15 毫秒
71.
OBJECTIVE: The majority of patients with long-term survival after pancreatic head resection suffer from pancreatic exocrine insufficiency. The objective of this study was to investigate whether this is due to glandular malfunction or obstructed pancreaticojejunal anastomosis. MATERIAL AND METHODS: Twenty-six patients (10 M, 16 F, mean age 61 years, range 34-81 years) were re-examined a median of 52 months (range 3-76 months) after pancreatic head resection and end-to-end invaginated pancreaticojejunostomy. Pancreatic exocrine function was measured by fecal elastase-1 assay. The size of the pancreatic remnant, glandular secretion and the flow through the anastomosis were analyzed with secretin-stimulated dynamic magnetic resonance pancreatography (D-MRP). RESULTS: All patients had pancreatic exocrine insufficiency, 24 (92%) of them having severe insufficiency. Eighteen patients (69%) reported moderate to severe diarrhea. Lowest fecal elastase-1 concentrations were associated with the initial diagnosis of chronic pancreatitis or ductal adenocarcinoma, suggesting preoperative primary or secondary chronic pancreatitis as important determinants. The size of the remnant gland did not correlate with the fecal elastase-1 concentrations. D-MRP failed in three patients. Severe glandular malfunctions were found in 7 (30%) of the 23 successful D-MRP examinations. The anastomosis was totally obstructed in 5 patients (22%) or partially obstructed in 6 (26%) but remained perfectly open in 5 patients (22%). The five patients with perfect anastomoses had the highest measured median fecal elastase-1 activity. CONCLUSIONS: Although late diarrhea and pancreatic exocrine insufficiency may be partly induced already by the disease treated with resection, at least half may be explained by obstructed anastomosis. To obtain better late functional results, improvements may be required in the surgical techniques.  相似文献   
72.
To assess the relationships between HIV transmission risk behaviours, HIV serostatus and knowledge of HIV serostatus among active injection drug users (IDUs) residing in Tallinn, Estonia, we conducted HIV testing and administered a standardized interview to 266 participants reporting recent injection drug use. In total, 45% were HIV positive, and of those, 39% knew their HIV serostatus. Those who knew their HIV-positive serostatus were less likely to report giving someone else their needle after they used it (9%) than were HIV-negative participants (23%) and those who were HIV positive but unaware of their HIV-positive serostatus (25%). There were no statistically significant differences in unprotected sex or other drug use behaviours between the groups. Most participants reported that HIV can be transmitted through sharing needles (98%) and unprotected sexual activity (93%). Prevention needs of IDUs in this area include increasing the rates of HIV testing and implementing effective programmes to reduce sexual and drug use risk behaviours.  相似文献   
73.
74.
We found a high prevalence of HIV among injecting drug users (IDU) 54% in Tallinn and 90% in Kohtla Jarve, Estonia. Risk factors for HIV in Tallinn included use of the drug 'china white', being registered as an IDU at a drug treatment clinic, and sharing injecting equipment with sex partners. Differences existed in risk behaviour between the cities. An urgent scale-up of HIV prevention is needed. It is also important to explore how local 'risk environments' mediate the risk of HIV transmission.  相似文献   
75.
Objective To analyse, on the basis of the literature, the potential of mobile phones to improve maternal health services in Low and Middle Income Countries (LMIC). Methods Wide search for scientific and grey literature using various terms linked to: maternal health, mobile telecommunication and LMIC. Applications requiring an internet connection were excluded as this is not widely available in LMIC yet. Results Few projects exist in this field and little evidence is available as yet on the impact of mobile phones on the quality of maternal health services. Projects focus mainly on the delay in receiving care – that is in recognizing the need and making the decision to seek care – and the delay in arriving at the health facility. This is achieved by connecting lesser trained health workers to specialists and coordination of referrals. Ongoing projects focus on empowering women to seek health care. Discussion There is broad agreement that access to communication is one of several essential components to improve maternal health services and hence the use of mobile phones has much potential. However, there is a need for robust evidence on constraints and impacts, especially when financial and human resources will be invested. Concurrently, other ways in which mobile phones can be used to benefit maternal health services need to be further explored, taking into consideration privacy and confidentiality.  相似文献   
76.
THE PURPOSE OF THIS QUALITY improvement project was to determine patients' perceptions of the emotional support and information provided to their family members by nurses in a day surgery setting.
THE PROJECT WAS CONDUCTED in a day surgery unit of a hospital in western Finland. Data were collected from 60 participants using a questionnaire designed specifically for the project.
THE RESULTS SHOWED that half of the patients appreciated the presence of their family members during hospital care. The emotional support provided to family members was rated as moderate, and more than 50% of the patients believed their family members were adequately informed. The results were used to help develop tools for patient and family member education. AORN J 81 (May 2005) 1030-1039.
  相似文献   
77.
Atypical genital herpes: report of five cases   总被引:3,自引:0,他引:3  
Manifestations of human genital herpes virus (HSV) infection are not limited to the typical cluster of genital lesions. Here we present 5 case histories suggestive to clinically atypical genital herpes (HSV detected with the polymerase chain reaction) collected in 2001 from a private outpatient clinic specializing in dermatological and venereal diseases. The clinical presentations included mucopurulent cervicitis, haemorrhagic cystitis, recurrent urethritis, and lower back pain.  相似文献   
78.
We tested whether exposure of β cells at reduced glucose leads to mitochondrial adaptions and whether such adaptions modulate effects of hypoxia. Rat islets, human islets and INS-1 832/13 cells were pre-cultured short term at half standard glucose concentrations (5.5 mM for rat islets and cells, 2.75 mM for human islets) without overtly negative effects on subsequently measured function (insulin secretion and cellular insulin contents) or on viability. Culture at half standard glucose upregulated complex I and tended to upregulate complex II in islets and INS-1 cells alike. An increased release of lactate dehydrogenase that followed exposure to hypoxia was attenuated in rat islets which had been pre-cultured at half standard glucose. In INS-1 cells exposure to half standard glucose attenuated hypoxia-induced effects on several viability parameters (MTT, cell number and incremental apoptotic DNA). Thus culture at reduced glucose of pancreatic islets and clonal β cells leads to mitochondrial adaptions which possibly lessen the negative impact of hypoxia on β cell viability. These findings appear relevant in the search for optimization of pre-transplant conditions in a clinical setting.  相似文献   
79.
80.
Pain as a result of cervical radiculopathy (CR) can be widespread, nondermatomal and individually specific, but the association between pain extent and other clinical features has never been explored. The objective of this study is to investigate whether pain extent relates to clinical variables including pain intensity in addition to health indicators including disability, general health, depression, somatic anxiety, coping strategies or self-efficacy.An observational cohort study was conducted. Participants were recruited from 4 hospital spinal centres in Sweden. Pain extent was quantified from the pain drawings of 190 individuals with cervical disc disease, verified with magnetic resonance imaging (MRI) and compatible with clinical findings (examined by a neurosurgeon), that show cervical nerve root compression. Pain extent was evaluated in relation to neck pain, arm pain, and headache intensity. Multiple linear regression analysis were then used to verify whether pain extent was associated with other health indicators including disability, health-related quality of life, depression, somatic anxiety, coping strategies and self-efficacy.Pain extent was directly related to neck, arm and headache pain intensity (all P < .01). Multiple linear regression revealed that pain extent was significantly associated only to the level of perceived disability (P < .01).Increased pain extent in people with CR is associated with higher headache, neck and arm pain intensity, and disability but not measures of general health, depression, somatic anxiety, coping strategies or self-efficacy.  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