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   3716篇
  免费   168篇
  国内免费   9篇
耳鼻咽喉   41篇
儿科学   110篇
妇产科学   53篇
基础医学   569篇
口腔科学   88篇
临床医学   222篇
内科学   860篇
皮肤病学   148篇
神经病学   339篇
特种医学   144篇
外科学   426篇
综合类   8篇
一般理论   1篇
预防医学   156篇
眼科学   46篇
药学   253篇
中国医学   4篇
肿瘤学   425篇
  2024年   4篇
  2023年   24篇
  2022年   38篇
  2021年   58篇
  2020年   43篇
  2019年   69篇
  2018年   74篇
  2017年   62篇
  2016年   72篇
  2015年   60篇
  2014年   99篇
  2013年   116篇
  2012年   225篇
  2011年   260篇
  2010年   150篇
  2009年   139篇
  2008年   222篇
  2007年   274篇
  2006年   251篇
  2005年   263篇
  2004年   221篇
  2003年   247篇
  2002年   229篇
  2001年   49篇
  2000年   52篇
  1999年   72篇
  1998年   77篇
  1997年   40篇
  1996年   41篇
  1995年   35篇
  1994年   24篇
  1993年   29篇
  1992年   31篇
  1991年   34篇
  1990年   29篇
  1989年   20篇
  1988年   13篇
  1987年   15篇
  1986年   15篇
  1985年   13篇
  1984年   9篇
  1983年   8篇
  1982年   10篇
  1981年   10篇
  1980年   17篇
  1979年   10篇
  1978年   5篇
  1976年   5篇
  1972年   4篇
  1968年   3篇
排序方式: 共有3893条查询结果,搜索用时 15 毫秒
51.
52.
Several epidemiological studies have indicated that there is a relationship between sleep habits, such as sleep duration, bedtime and bedtime regularity, and mental health status, including depression and anxiety in adolescents. However, it is still to be clarified whether the relationship is direct cause‐and‐effect or mediated by the influence of genetic and other traits, i.e. quasi‐correlation. To examine this issue, we conducted a twin study using a total of 314 data for monozygotic twins from a longitudinal survey of sleep habits and mental health status conducted in a unified junior and senior high school (grades 7–12), located in Tokyo, Japan. Three‐level hierarchical linear model analysis showed that both bedtime and sleep duration had significant associations with the Japanese version of the 12‐item General Health Questionnaire (GHQ‐12) score, suicidal thoughts and the experience of self‐harm behaviours when genetic factors and shared environmental factors, which were completely shared between co‐twins, were controlled for. These associations were statistically significant even after controlling for bedtime regularity, which was also associated significantly with the GHQ‐12 score. These suggest that the associations between sleep habits and mental health status were still statistically significant after controlling for the influence of genetic and shared environmental factors of twins, and that there may be a direct cause‐and‐effect in the relationship in adolescents. Thus, late bedtime and short sleep duration could predict subsequent development of depression and anxiety, including suicidal or self‐injury risk. This suggests that poor mental health status in adolescents might be improved by health education and intervention concerning sleep and lifestyle habits.  相似文献   
53.
54.
55.
AIM:To study the relationship between adverse events(AEs),efficacy,and nursing intervention for sorafenibtherapy in patients with hepatocellular carcinoma(HCC).METHODS:We enrolled 37 consecutive patients withadvanced HCC who received sorafenib therapy.Relationships among baseline characteristics as well as AEoccurrence and tumor response,overall survival(OS),and treatment duration were analyzed.The nursingintervention program consisted of education regardingself-monitoring and AEs management,and telephoneRESULTS:A total of 37 patients were enrolled in the study,comprising 30 males(81%) with a median age of 71 years.The disease control rate at 3 mo was 41%,and the median OS and treatment duration were 259 and 108 d,respectively.Nursing intervention was given to 24 patients(65%).Every patient exhibited some kinds of AEs,but no patients experienced G4 AEs.Frequently observed AEs G2 included anorexia(57%),skin toxicity(57%),and fatigue(54%).Factors significantly associated with longer OS in multivariate analysis demonstrated that age ≤ 70 years,presence of G2 skin toxicity,and absence of G2 hypoalbuminemia.The disease control rate in patients with G2 skin toxicity was 13/20(65%),which was significantly higher compared with that in patients with no or G1 skin toxicity.Multivariate analysis revealed that nursing intervention and G2 skin toxicity were independent significant predictors for longer treatment duration.CONCLUSION:Skin toxicity was associated with favorable outcomes with sorafenib therapy for advanced HCC.Nursing intervention contributed to better adher-ence,which may improve the efficacy of sorafenib.  相似文献   
56.
We investigated the percentage of total basal insulin dose to total daily insulin dose (%TBD) among Japanese youth of different ages with type 1 diabetes. The study enrolled 69 patients with type 1 diabetes who were treated with multiple daily injections of insulin. The participants were divided into the following age groups: group A, 0 to <10 years (n = 18); group B, 10 to <20 years (n = 31) and group C, 20 to <25 years (n = 20). We found no difference in the sex ratio, body mass index, and glycated hemoglobin and 2‐h postprandial C‐peptide levels among the three groups. Participants assigned to group B had a significantly higher percentage of total daily insulin dose than those in group A and group C (49.7 ± 10.4% vs 38.5 ± 13.7% and 38.3 ± 8.2%, P = 0.0005). In conclusion, the basal insulin requirements of Japanese youth with type 1 diabetes might have an age effect that is associated with puberty.  相似文献   
57.
Inflammation substantially affects the risk of oral malignancy. Pro-inflammatory cytokine, interferon (IFN)-γ, confers anti-tumor activity using several different mechanisms. Conversely, higher expression of interleukin (IL)-17 is associated with worse prognosis. Monocyte chemotactic protein (MCP)-1 correlates positively with poor long-term survival of head and neck squamous cell carcinoma (HNSCC) patients. IL-1α affects cancer associated fibroblasts and macrophages, and promote several malignant phenotypes including immune suppression. Some anti-inflammatory cytokines, including IL-10 and transforming growth factor (TGF)-β, relate to pro-tumoral activities.Among immune checkpoint modulators, programmed death (PD-)1 and PD-ligand (L)1 facilitate oral squamous cell carcinoma (OSCC) cell evasion from immune surveillance, and the expression status of these has a prognostic value.OSCCs contain tumor associated macrophages (TAMs) as major stromal cells of their tumor microenvironment. Among the two distinctive states, M2 macrophages support tumor invasion, metastasis and immune suppression. Crosstalk between TAMs and OSCC or cancer-associated fibroblasts (CAF) plays an important role in the progression of OSCC.Clinical trials with blocking antibodies against IL-1α or melanoma-associated antigens have been reported as therapeutic approaches against OSCCs. The most promising approach activating antitumor immunity is the blockade of PD-1/PD-L1 axis. Manipulating the polarization of pro-tumorigenic macrophages has been reported as a novel therapeutic approach.  相似文献   
58.
Abstract Objective. Patients with gastroesophageal reflux disease (GERD) also have various extra-esophageal symptoms. Laryngopharyngeal reflux disease (LPRD) is a subtype of GERD associated with globus sensation, but proton pump inhibitor (PPI) therapy achieves disappointing results. This study investigated esophageal motility in GERD patients with globus sensation who were resistant to PPI therapy. Design. The subjects were 350 patients with globus sensation. All patients underwent both laryngoscopy and upper gastrointestinal endoscopy to exclude organic disease. After 4 weeks of treatment with rabeprazole sodium (20 mg daily), the patients were divided into PPI-responsive and PPI-resistant groups. Then we investigated esophageal motility in the PPI-resistant group by a multichannel intraluminal impedance and manometry study. Results. A total of 119 patients (55.6%) were resistant to PPI therapy, among whom 57 patients (47.9%) had abnormal esophageal motility. They included 36 patients (66.4%) with ineffective esophageal motility, 9 patients (14.4%) with achalasia, 6 patients (9.6%) with diffuse esophageal spasm, 5 patients (8%) with nutcracker esophagus, and 1 patient (1.6%) with hypertensive lower esophageal sphincter. There were significant differences of upper esophageal sphincter pressure and esophageal body peristalsis between the patients with PPI-resistant LPRD and healthy controls matched for age and sex. Conclusion. Among patients with PPI-resistant LPRD, 47.9% had abnormal esophageal motility.  相似文献   
59.
60.
Background: Single inhaled corticosteroids and long-acting beta-agonists (ICS/LABA) are clinically effective and safe. However, if local oropharyngeal and laryngeal adverse effects (LOLAE) appear, adherence to the use of ICS is impaired. To minimize the development of adverse effects, it is essential to identify the underlying risk factors.Methods: The study included 481 asthmatic patients who were prescribed ICS/LABA for the first time in their life between January and September of 2010. Patients ranged in age from 14 to 86 years old and consisted of 281 never smokers and 200 smokers. All data were collected retrospectively by respirologists.Results: Seventy-three out of 481 patients suffered from one or more adverse effects, with 54 of these exhibiting LOLAE. Patients with LOLAE (51.4 ± 16.2 yrs) were significantly older than those without LOLAE (43.7 ± 15.9 yrs) (p = 0.0011) and were also prescribed a significantly higher dose of ICS. The pack-years of patients with LOLAE (2.1 ± 4.9) were significantly lowerthan those without LOLAE (6.0 ± 13.0) (p = 0.0087). The type of administered ICS was also significantly associated with a risk of developing LOLAE.Conclusions: Our survey indicated that a greater age, a higher dose of ICS, and the type of ICS were potential risk factors of LOLAE. The identified factors should be considered in a clinical setting in order to prevent the development of LOLAE and provide optimal treatment to patients.  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