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   35036篇
  免费   1693篇
  国内免费   287篇
耳鼻咽喉   265篇
儿科学   649篇
妇产科学   412篇
基础医学   4666篇
口腔科学   1002篇
临床医学   2003篇
内科学   8664篇
皮肤病学   851篇
神经病学   2424篇
特种医学   1231篇
外科学   6367篇
综合类   121篇
一般理论   1篇
预防医学   939篇
眼科学   628篇
药学   2066篇
中国医学   121篇
肿瘤学   4606篇
  2023年   182篇
  2022年   157篇
  2021年   716篇
  2020年   450篇
  2019年   640篇
  2018年   841篇
  2017年   655篇
  2016年   766篇
  2015年   800篇
  2014年   1075篇
  2013年   1369篇
  2012年   2227篇
  2011年   2607篇
  2010年   1474篇
  2009年   1213篇
  2008年   2226篇
  2007年   2460篇
  2006年   2302篇
  2005年   2478篇
  2004年   2388篇
  2003年   2388篇
  2002年   2394篇
  2001年   348篇
  2000年   291篇
  1999年   396篇
  1998年   509篇
  1997年   393篇
  1996年   366篇
  1995年   370篇
  1994年   321篇
  1993年   297篇
  1992年   207篇
  1991年   187篇
  1990年   181篇
  1989年   163篇
  1988年   144篇
  1987年   107篇
  1986年   99篇
  1985年   87篇
  1984年   104篇
  1983年   85篇
  1982年   71篇
  1981年   86篇
  1980年   82篇
  1979年   57篇
  1978年   41篇
  1977年   29篇
  1976年   24篇
  1975年   23篇
  1973年   22篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
BackgroundThe “retired husband syndrome” refers to the negative impact of the husband’s retirement on the wife’s health. This study provided new insights by examining whether and to what extent the wife’s social participation, interactions with her husband, and job status prior to her husband’s retirement affected the evolution of her mental health after her husband’s retirement.MethodsWe collected data from a 12-wave nationwide panel survey conducted from 2005 to 2016, starting with individuals aged 50–59 years. Focusing on 3,794 female respondents whose husbands retired during the survey period, we applied random-effects linear regression models to investigate the evolution of their mental health as measured by the Kessler 6 (K6) score (range, 0–24; Mean, 3.41; standard deviation, 4.11) during the 5 years after their husbands’ retirement.ResultsOn average, the wife’s K6 score rose by 0.18 (95% confidence interval [CI], 0.08–0.28), 0.18 (95% CI, 0.03–0.34), and 0.19 (95% CI, −0.02 to 0.43) in the first 3 years, respectively, after the husband’s retirement, before declining toward the baseline level. However, the wife’s active social participation, intense interactions with her husband, and absence of paid employment before her husband’s retirement prevented her mental health from deteriorating.ConclusionThe results suggest the limited relevance of the “retired husband syndrome” among middle-aged Japanese couples. The effects of a husband’s retirement on the wife’s mental health depended heavily on her prior behavior.Key words: marital quality, mental health, random-effects model, retired husband syndrome, social participation  相似文献   
6.
7.
Objectives: Phase angle (PA) is a poor prognostic factor in patients with advanced cancer. This study aimed to identify possible correlations between PA and symptoms, quality of life, fluid retention, and laboratory data in cancer patients in palliative care settings.

Methods: Individuals who visited the outpatient clinic or were admitted to the palliative care unit were eligible. Patients with a performance status of 4 and/or those unable to complete questionnaires were excluded. PA was evaluated using a bioanalyzer device. The correlation coefficient between PA and the variables of interest was analyzed.

Results: A total of 102 patients were analyzed. PA was weakly correlated with age (ρ = ?0.22), performance status (ρ = ?0.30), functional well-being (ρ?=?0.20), anorexia/cachexia subscale (ρ?=?0.22), and Functional Assessment of Anorexia/Cachexia Therapy trial outcome index (ρ?=?0.26). PA was also correlated with fluid retention (ρ = ?0.34) and albumin (ρ?=?0.32), C-reactive protein (ρ = ?0.31), and hemoglobin (ρ?=?0.41) levels. Sub-analysis stratified according to sex revealed that males demonstrated the same results; however, female sex demonstrated a correlation between PA and social well-being (ρ = ?0.43).

Conclusions: PA was correlated with physical condition, but not with psychological well-being.  相似文献   

8.

Purpose

To evaluate the influence of percutaneous cryoablation for renal cell carcinoma on function of the affected kidney.

Materials and Methods

Between June 2016 and September 2017 at our institution, 12 inoperable patients underwent 15 cryoablation sessions for 17 small renal tumors. Of these, 9 patients who underwent 11 sessions of cryoablation were the focus of this study. For those patients, time-dependent changes in postoperative renal function were investigated by a retrospective review of clinical records. Evaluated were the estimated glomerular filtration rate (eGFR) and scintigraphy using 99m technetium-mercaptoacetyltriglycine (99mTc-MAG3) before and 1 week, 1–2 months, and more than 6 months after cryoablation.

Results

Mean baseline eGFR was 76.88 ± 29.82 mL/min/1.73 m2 (mean ± standard deviation; range, 23.4–112.5). Mean eGFR 1 week, 1–2 months, and more than 6 months after cryoablation were 74.56 ± 26.68 mL/min/1.73 m2 (21.0–101.1), 69.5 ± 25.28 mL/min/1.73 m2 (24.1–105.6), and 75.08 ± 26.25 mL/min/1.73 m2 (29.0–107.3), respectively. Changes were statistically insignificant (P = .6044, P = .6699, and P = .9038, respectively). Regarding split renal function, the mean baseline contribution of the affected kidney determined by 99mTc-MAG3 was 47.27% ± 6.14 (38.8%–57.0%). Mean contributions of the affected kidney 1 week after, 1–2 months after, and more than 6 months after cryoablation were 44.40% ± 5.37 (38.3%–53.6%), 44.57% ± 6.52 (34.35%–55.0%), and 45.41% ± 7.77 (34.4%–56.5%), respectively. Differences from baseline were significant for the earliest 2 periods (P = .0473 and P = .0334, respectively) but not the later period (P = .2532).

Conclusions

Results suggested that total renal function does not worsen after cryoablation; however, function of the affected kidney worsened after cryoablation but later partially recovered.  相似文献   
9.
10.
This report presents reconstruction of wide‐ and full‐thickness upper eyelid defects with a composite radial forearm–splitting palmaris longus tendon flap, which maintains eyelid opening and closing functions and supporting tissue in a Meibomian gland carcinoma in the right upper eyelid (case 1) and Merkel cell carcinoma in the right upper eyelid (case 2). After tumor resection with excisional margins, the defects involved the muscle, tarsal, and mucosa, with defect sizes of 60 × 40 mm and 85 × 40 mm, respectively. A radial forearm flap with the palmaris longus tendon was transferred. The tendon was split into two strips: the upper strip was fixed to the frontal muscles for the opening function and the lower strip to the medial palpebral ligament and orbicularis oculi muscle to maintain the closing function. Flap vessels were anastomosed to the superficial temporal artery and vein through the subdermal tunnel. Postoperative courses were uneventful. At the 5‐year (case 1) and 4‐year (case 2) follow‐up periods, there were no tumor recurrence and keratalgia, and the eyelid opening and closing functions were maintained. This approach may contribute to achievement of not only the opening function but also the closing function of the reconstructed eyelid.  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