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   7218篇
  免费   455篇
  国内免费   11篇
耳鼻咽喉   67篇
儿科学   548篇
妇产科学   77篇
基础医学   880篇
口腔科学   115篇
临床医学   493篇
内科学   1315篇
皮肤病学   163篇
神经病学   344篇
特种医学   211篇
外科学   1020篇
综合类   186篇
一般理论   2篇
预防医学   451篇
眼科学   330篇
药学   807篇
中国医学   38篇
肿瘤学   637篇
  2023年   62篇
  2022年   46篇
  2021年   203篇
  2020年   158篇
  2019年   165篇
  2018年   225篇
  2017年   153篇
  2016年   219篇
  2015年   203篇
  2014年   303篇
  2013年   364篇
  2012年   535篇
  2011年   543篇
  2010年   304篇
  2009年   210篇
  2008年   365篇
  2007年   332篇
  2006年   281篇
  2005年   266篇
  2004年   252篇
  2003年   229篇
  2002年   168篇
  2001年   186篇
  2000年   143篇
  1999年   143篇
  1998年   45篇
  1997年   37篇
  1995年   39篇
  1992年   101篇
  1991年   73篇
  1990年   84篇
  1989年   91篇
  1988年   67篇
  1987年   68篇
  1986年   67篇
  1985年   84篇
  1984年   64篇
  1983年   56篇
  1980年   33篇
  1979年   68篇
  1978年   37篇
  1977年   38篇
  1976年   48篇
  1975年   66篇
  1974年   38篇
  1973年   60篇
  1971年   41篇
  1970年   32篇
  1969年   39篇
  1968年   29篇
排序方式: 共有7684条查询结果,搜索用时 31 毫秒
1.
Objectives: The characteristics of patients with Acute Respiratory Distress Syndrome (ARDS) as a complication of Babesia microti infection have not been systematically described.

Methods: Adult patients admitted to the medical intensive care unit (MICU) of a tertiary care hospital in the Lower Hudson Valley of New York from 1/1/2008 to 8/1/2016 were evaluated for ARDS complicating babesiosis.

Results: Of 22 patients with babesiosis in the MICU, eight (36.4%; 95% CI: 19.7–57.0%) had ARDS. Six patients (75%) developed ARDS following initiation of anti-babesia drug therapy; however, the mean duration of symptoms in these patients exceeded that of patients who developed ARDS prior to initiation of treatment (7.50 ± 3.83d vs. 4.50 ± 0.71d, p = 0.34). Three patients (37.5%; 95% CI: 13.7–69.4%) expired without recovery from ARDS. In comparison, the mortality rate for the 14 MICU babesiosis patients without ARDS was 14.3% (p = 0.31). There was a trend toward younger age in survivors relative to non-survivors (mean age 54.6 ± 13.8y vs. 74.0 ± 6.24y, p = 0.07). Three of the five survivors did not require mechanical ventilation. The mean sequential organ failure assessment score of non-survivors was significantly higher than that of survivors (12.3 ± 1.15 vs. 6.0 ± 1.4, p = 0.0006).

Conclusion: Among 22 critically ill adult patients with B. microti infection, ARDS developed in eight (35.4%), and three (37.5%) expired without resolution of the ARDS. ARDS often followed the initiation of anti-babesia drug therapy, raising the question of whether the death of the parasite per se contributed to its development. However, this observation was confounded by the longer duration of symptoms preceding initiation of drug therapy.  相似文献   

2.

Background

Multiple myeloma (MM) is a hematologic malignancy of plasma cell origin. MM primarily affects bone marrow, but extramedullary sites can also be involved. Myelomatous pleural effusion (MPE) is an atypical and rare complication of MM. We aimed to systematically study the incidence and clinicopathologic profile of patients with MPE in a real-world setting.

Patients and Methods

In this retrospective study, 415 consecutive patients with MM managed at a tertiary care center in North India during a study period of January 1, 2010 to December 31, 2015 were evaluated for MPE. The patients with MPE were analyzed for their clinical profile, diagnosis, treatment, and outcomes.

Results

Of these 415 patients, 11 (2.65%) patients had MPE. The median age of the study population was 50 years with male preponderance. The majority of these patients had immunoglobin (Ig)G Kappa disease. All patients had higher than International Staging System stage I disease. MPE was a presenting feature at MM diagnosis in 45.45% (n = 5) of the patients, whereas the rest developed MPE during follow-up. MPE presented predominantly (81.8%) as a unilateral effusion. Concurrent extramedullary involvement at other site was seen in 45.45% (n = 5), with 3 (27%) patients having concurrent myelomatous ascites. Six of these were managed aggressively, whereas 5 patients opted for palliation. The outcomes were dismal (90.9% mortality), with a median survival of 2.47 months.

Conclusion

MPE is a rare entity, and positive outcomes of therapy remain low with dismal prognosis.  相似文献   
3.
4.
5.
6.
Aim: To evaluate and compare salivary and serum levels of Alkaline Phosphates and Lactate Dehydrogenase in patients without the habit of tobacco, in patients with the habit of tobacco, in patients with benign oral lesions and in patients with oral premalignant lesions and oral malignant lesions. Material and Methodology: This study was comprised of 500 subjects, Group I: 100 healthy individuals without the habit of tobacco usage formed the control group. Group II: 100 patients with the habit of tobacco/ smoking consumption without any oral lesion. Group III: 100 patients with benign oral lesions. Group IV: 100 patients having the history of tobacco consumption and having apparent precancerous lesions like leukoplakia, erythroplakia. Group V:100  patients having frank oral cancer. The grade of dysplasia in these patients was statically correlated with the levels of serum and salivary ALP and LDH. Results: This study revealed that there was high expression of both serum and salivary ALP and LDH  in group IV and Group V as compared with the other groups and mean difference showed a statistically significant p value of less than 0.01. This study revealed that the in group V, the highest level of serum and salivary ALP was found in those patients who were reported with poorly differentiated oral cancer. Conclusion: Both Alkaline phosphates and Lactate dehydrogenase could be considered a sensitive markers for the detection of dysplasia with already existing precancancerous and cancerous lesions.  相似文献   
7.
8.
Survivors of childhood cancer are at risk for obesity, a condition potentially modifiable if dietary intake and physical activity are optimized. These health behaviors are likely influenced by neighborhood of residence, a determinant of access to healthy, affordable food and safe and easy exercise opportunities. We examined associations between neighborhood level factors and obesity among survivors in the St. Jude Lifetime cohort and community comparison group members. Persons with residential addresses available for geocoding were eligible for analysis (n = 2,265, mean age 32.5 [SD 9.1] years, 46% female, 85% white). Survivors completed questionnaires regarding individual behaviors; percent body fat was assessed via dual X-ray absorptiometry (obesity: ≥25% males; ≥35% females); neighborhood effect was characterized using census tract of residence (e.g., neighborhood socioeconomic status [SES], rurality). Structural equation modeling was used to determine associations between neighborhood effect, physical activity, diet, smoking, treatment exposures and obesity. Obese survivors (n = 1,420, 62.7%) were more likely to live in neighborhoods with lower SES (RR: 1.23, 95% CI: 1.10–1.38) and rural areas (RR: 1.22, 95% CI: 1.07–1.39) compared to survivors with normal percent body fat. Resource-poor neighborhoods (standardized effect: 0.06, p < 0.001) and cranial radiation (0.16, p < 0.001) had direct effects on percent body fat. Associations between neighborhood of residence and percent body fat were increased (0.01, p = 0.04) among individuals with a poor diet. Neighborhoods where survivors reside as an adult is associated with obesity. Interventions targeting survivors should incorporate strategies that address environmental influences on obesity.  相似文献   
9.
Background: Tobacco is one of the leading causes of preventable deaths. It is both a major social and health problem. According to National Sample Survey Organization of Government of India about 20 million children of ages 10-14 are estimated to be tobacco-addicted. There are grave consequences of tobacco both socially and also on health thus it is of utmost importance to understand the factors leading to its use and to plan strategies to reduce its intake. However, the health implications of this social issue in a rural context have not been explored. Aims and Objective: this study makes an attempt to explore the health and social implications of tobacco usage by the children below the age of 14 years in hamlet. Materials and Methods:  The present study employed a qualitative study design. Data was collected using focus group discussion and in-depth interview of key informants. Thematic analysis for exploring the explicit and implicit meanings within the data was done. The themes which emerged were knowledge about tobacco and the various products available, children and parents’ tobacco use and habits, the health and social implication of tobacco use, reasons for tobacco use by the children. Results: It was found tobacco use by the children was very common in the community. Parent, peer pressure, sibling pressure were found to be playing important role in the initiation of tobacco habit by the child. Further illiteracy and lack of awareness was also lead to tobacco use among children. Conclusion: The study identifies education and awareness of parents about the ill-effects of tobacco play an important role as parents act as role model for their children, thus equal stress should be laid in improving the parental habits. Even raising the prices of tobacco products can help in controlling this habit.  相似文献   
10.
Atopic dermatitis is a well-recognized clinical entity, several facets of which continue to be mystified. Accordingly, its etio-pathogenesis is largely elusive. It appears to be an outcome of interplay of several undertones, namely: genetics, maternal factor and inheritance, pregnancy/intrauterine, environmental factors, immune dysregulation, immuno-globulins, role of diet, and infection. Besides, recent innovative breakthroughs consisting of nutritional supplementation, the highlights of which were considered worthwhile to take stock of to define its current status. An endeavor to enlighten the audience has been made for their benefit.  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