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   13039篇
  免费   728篇
  国内免费   94篇
耳鼻咽喉   88篇
儿科学   232篇
妇产科学   129篇
基础医学   2069篇
口腔科学   97篇
临床医学   1332篇
内科学   2944篇
皮肤病学   357篇
神经病学   1268篇
特种医学   525篇
外科学   2039篇
综合类   49篇
一般理论   2篇
预防医学   633篇
眼科学   214篇
药学   910篇
中国医学   37篇
肿瘤学   936篇
  2023年   57篇
  2022年   31篇
  2021年   228篇
  2020年   151篇
  2019年   226篇
  2018年   318篇
  2017年   201篇
  2016年   236篇
  2015年   268篇
  2014年   374篇
  2013年   514篇
  2012年   906篇
  2011年   1025篇
  2010年   602篇
  2009年   534篇
  2008年   876篇
  2007年   1011篇
  2006年   919篇
  2005年   950篇
  2004年   881篇
  2003年   868篇
  2002年   838篇
  2001年   138篇
  2000年   100篇
  1999年   125篇
  1998年   172篇
  1997年   121篇
  1996年   122篇
  1995年   110篇
  1994年   110篇
  1993年   104篇
  1992年   95篇
  1991年   58篇
  1990年   47篇
  1989年   62篇
  1988年   51篇
  1987年   43篇
  1986年   47篇
  1985年   30篇
  1984年   42篇
  1983年   38篇
  1982年   41篇
  1981年   31篇
  1980年   33篇
  1979年   23篇
  1978年   18篇
  1977年   17篇
  1976年   11篇
  1975年   9篇
  1974年   13篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
ObjectiveTo examine the screening rates for kidney damage and function among patients with type 2 diabetes (T2D) and chronic kidney disease stage at diabetes diagnosis using a US administrative claims database.Patients and MethodsThis cohort study used a claims database enriched with laboratory results data. Patients with T2D (defined as 1 inpatient or 2 outpatient claims for diabetes), aged 18 years or older, and with at least 1 year of follow-up enrollment were identified. Patients with type 1 diabetes, kidney disease, or other related conditions at baseline were excluded. We estimated screening rates using laboratory orders for serum creatinine and estimated glomerular filtration rate (eGFR) measurement and urine albumin to creatinine ratio (UACR). Chronic kidney disease severity was reported using the Kidney Disease: Improving Global Outcomes classification based on laboratory results.ResultsA total of 1,881,447 patients with T2D were eligible for analysis. Mean ± SD age was 63.1±13.1 years; 947,150 patients (50.3%) were male. Serum creatinine tests were ordered within 14 days of the index date among 290,722 patients of 622,915 (46.7%) patients with newly-recognized T2D. Overall, 1,595,964 patients (84.8%) had at least one serum creatinine test ordered during the 1-year follow-up period. Fewer patients received a UACR test during follow-up (814,897 [43.3%]). Less than half of all patients with T2D received a laboratory test order for both serum creatinine and urine albumin measurements during the follow-up period.ConclusionPhysicians treating patients with diabetes are selectively adhering to chronic kidney disease screening guidelines, as indicated by high rates of eGFR testing, but less frequent UACR testing. Despite recommendations to monitor both eGFR and UACR, less than half of patients were screened for albuminuria during the 1-year follow-up.  相似文献   
3.
This position paper was intended to update the former consensus between the French Societies of Radiology and Cardiology about the use of stress cardiac magnetic resonance imaging (MRI) in chronic coronary syndrome published in 2009. The Delphi method was used to build the present consensus. This expert panel consensus includes recommendations for indications, procedure with patient preparation, stress inducing drugs, acquisition protocol, interpretation and risk stratification by stress MRI.  相似文献   
4.
European Journal of Clinical Microbiology & Infectious Diseases - Twenty-five patients with reflux cholangitis (RC) defined as acute cholangitis (AC) with normal abdominal imaging...  相似文献   
5.
6.
The growth hormone secretagogue receptor (GHSR) is a G protein‐coupled receptor that is highly expressed in the central nervous system. GHSR acts as a receptor for ghrelin and for liver‐expressed antimicrobial peptide 2 (LEAP2), which blocks ghrelin‐evoked activity. GHSR also displays ligand‐independent activity, including a high constitutive activity that signals in the absence of ghrelin and is reduced by LEAP2. GHSR activity modulates a variety of food intake‐related behaviours, including binge eating. Previously, we reported that GHSR‐deficient mice daily and time‐limited exposed to a high‐fat (HF) diet display an attenuated binge‐like HF intake compared to wild‐type mice. In the present study, we aimed to determine whether ligand‐independent GHSR activity affects binge‐like HF intake in a 4‐day binge‐like eating protocol. We found that plasma levels of ghrelin and LEAP2 were not modified in mice exposed to this binge‐like eating protocol. Moreover, systemic administration of ghrelin or LEAP2 did not alter HF intake in our experimental conditions. Interestingly, we found that central administration of LEAP2 or K‐(D‐1‐Nal)‐FwLL‐NH2, which are both blockers of constitutive GHSR activity, reduced binge‐like HF intake, whereas central administration of ghrelin or the ghrelin‐evoked GHSR activity blockers [D‐Lys3]‐GHRP‐6 and JMV2959 did not modify binge‐like HF intake. Taken together, current data indicate that GHSR activity in the brain affects binge‐like HF intake in mice independently of plasma levels of ghrelin and LEAP2.  相似文献   
7.
Advanced melanoma patients who failed anti-PD-1 therapy have limited options. We analyzed a cohort of 133 advanced melanoma patients receiving anti-PD-1 monotherapy in a referral center between April 2015 and December 2017, and included the 26 patients with confirmed progressive (PD) or stable disease who received additional radiotherapy with an unmodified anti-PD-1 mAb regimen. Tumor evaluations were done on radiated and nonradiated (RECIST 1.1) lesions, with abscopal effect defined as a partial (PR) or complete response (CR) outside radiated fields. Primary endpoint was the CR + PR rate in radiated + nonradiated lesions. Secondary endpoints were progression-free survival (PFS), melanoma-specific survival (MSS) and safety. First late radiotherapy, consisting of hypofractionated radiotherapy (3–5 sessions, 20–26 Gy), standard palliative radiotherapy or brain radiosurgery was begun after a median of 6.3 months of anti-PD-1 in 23, 2 and 1 patient(s), respectively. Best response was 8 (31%) CR, 2 (8%) profound PR allowing surgical resection of remaining metastases and 16 (62%) PD. Abscopal effect was seen in 35% of patients. Median PFS and MSS since anti-PD-1 initiation was 15.2 [95% CI: 8.0 not achieved (na)] and 35.3 [95% CI: 18.5 na] months, respectively. PFS curves seemed to achieve a plateau. We discontinued anti-PD-1 therapy in 9/10 of patients with no residual evaluable disease and observed one relapse after a median of 10 months off anti-PD1-therapy. No unusual adverse event was recorded. Limitations of the study include its retrospective nature and limited size. Hypofractionated radiotherapy may enhance anti-PD1 monotherapy efficacy in patients who previously failed anti-PD-1 therapy. Controlled studies are needed.  相似文献   
8.
9.
10.
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