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   1529篇
  免费   114篇
  国内免费   5篇
耳鼻咽喉   10篇
儿科学   43篇
妇产科学   52篇
基础医学   251篇
口腔科学   37篇
临床医学   163篇
内科学   301篇
皮肤病学   16篇
神经病学   96篇
特种医学   53篇
外科学   178篇
综合类   41篇
预防医学   131篇
眼科学   30篇
药学   114篇
中国医学   23篇
肿瘤学   109篇
  2023年   31篇
  2022年   83篇
  2021年   101篇
  2020年   76篇
  2019年   78篇
  2018年   90篇
  2017年   71篇
  2016年   69篇
  2015年   83篇
  2014年   92篇
  2013年   107篇
  2012年   129篇
  2011年   122篇
  2010年   67篇
  2009年   52篇
  2008年   69篇
  2007年   58篇
  2006年   47篇
  2005年   33篇
  2004年   19篇
  2003年   15篇
  2002年   17篇
  2001年   9篇
  2000年   8篇
  1999年   9篇
  1998年   3篇
  1997年   4篇
  1996年   8篇
  1994年   2篇
  1993年   2篇
  1992年   3篇
  1991年   13篇
  1990年   11篇
  1989年   7篇
  1988年   6篇
  1987年   3篇
  1986年   5篇
  1984年   3篇
  1983年   4篇
  1982年   2篇
  1981年   2篇
  1980年   4篇
  1978年   2篇
  1977年   2篇
  1973年   2篇
  1972年   2篇
  1971年   4篇
  1970年   2篇
  1969年   3篇
  1967年   7篇
排序方式: 共有1648条查询结果,搜索用时 10 毫秒
101.
Pulmonary arteriovenous malformation is one of the rarest congenital anomalies of cardiovascular system. We present a case of 30-year-old female with a large pulmonary arteriovenous malformation (PAVM) arising from the right lower pulmonary artery and draining to the left atrium. She underwent successful embolization using three detachable Cook coils.  相似文献   
102.
This paper utilizes maximum likelihood methods to simulate a Hirschman-Herfindahl index (HHI) for markets in which complete market share information is unavailable or delayed. Many jurisdictions either may be unable to administratively collect data or experience delays in collection that make data regarding turbulent markets of limited use. With the development of this method, regulatory authorities monitoring health-care competition or health-care firms can now use market surveys--in which reliable recall is often limited to the largest three or four firms--to produce an on-the-spot measure of market concentration.  相似文献   
103.
104.
Potter's reno-facial syndrome is a rare innate abnormality. We bring 4 observations repertoried at the maternity of military hospital of Tunis over a period of 6 years (1997 - 2002). The purpose of our work is to determine after a review of the literature the echographic and foetopathologic characteristics, and the forecast of this syndrome. The frequency of the bilateral renale agenesis is of 0.27 per thousand. Positive diagnosis bases essentially on the ultrasound of the 2th, or the 3-th trimester. The signs of appeal are essentially the oligoamnios associated to an hypotrophy. The caryotype is systematic to eliminate an associeted chromosomic abnormality. Foetopathologic exam is usefull for the diagnosis. Main abnormality except the urinary pathology is the lung hypoplasia. Therapeutic interruption of the pregnancy in this situation not compatible with the extra-uterine life., only type IV authorize the development of the pregnancy according to echographic data and of foetal urinaire biochemistry. We insist on the early practice of the morphological ultrasound between 20 - 22 weeks for the diagnosis of foetal abnormalities and the place of the genetic advice in association with the geneticist in the coverage of the couple.  相似文献   
105.
Sixty children survived for five years after the diagnosis of histiocytosis X. Serious disabilities were seen in 50% of children whose disease involved soft tissue and bone. Late deaths from pulmonary failure were associated with opportunistic infections in two cases. Future treatment approaches must weigh the risks of therapy-related complications against the probability of significant disability if the disease continues for many years.  相似文献   
106.
We investigated the association of human leukocyte antigen (HLA) class II alleles and haplotypes with the pathogenesis of sickle cell anemia (SCA) osteomyelitis. SCA patients comprised 42 patients with osteomyelitis and 150 patients without osteomyelitis; HLA-DRB1* and HLA-DQB1* genotyping was performed by polymerase chain reaction-sequence-specific priming (SSP). DRB1*100101 (P value corrected for the number of different alleles tested, Pc=0.003) was positively associated with osteomyelitis. At the haplotype level, DRB1*100101-DQB1*050101 (Pc=0.001) was more prevalent among patients, while DRB1*030101-DQB1*0201 (Pc=0.020) and DRB1*040101-DQB1*0302 (Pc=0.039) were more prevalent among SCA controls, thereby conferring disease susceptibility or protection to these haplotypes, respectively. These results show that specific HLA haplotypes influence SCA osteomyelitis risk and that specific HLA types may serve as markers for identifying SCA patients at high risk for osteomyelitis.  相似文献   
107.
108.
Abdul‐Rasoul M, Al‐Mahdi M, Al‐Qattan H, Al‐Tarkait N, Alkhouly M, Al‐Safi R, Al‐Shawaf F, Mahmoud H. Ketoacidosis at presentation of type 1 diabetes in children in Kuwait: frequency and clinical characteristics. Background: Diabetic ketoacidosis (DKA) has significant morbidity and mortality, and is common at diagnosis in children. Objective: Describe the frequency and severity of DKA at diagnosis of type 1 diabetes mellitus (T1DM) in children in Kuwait. Methods: Hospital records of 677 diabetic children less than 12 yr of age, diagnosed during the period of 2000–2006 were reviewed. DKA was defined as blood glucose > 11 mmol/L, pH < 7.3, and/or bicarbonate < 15 mmol/L with ketonuria. Results: Of all patients diagnosed with T1DM, 255 (37.7%) presented with DKA. The frequency of DKA was constant between 2000 and 2002 (42.7–41.5%), but decreased in the following years to 30.7% in 2006 (p < 0.005). The majority had either mild or moderate DKA (74.1%). Fifty‐one (36.7%) of all children in the 0–4 yr had severe DKA compared to ten (2.9%) in the 5‐ to 8‐yr‐old group, and three (1.5%) in 9‐ to 12‐yr‐old patients (p < 0.0001). Moreover, 83% of children with severe DKA were in the 0–4 yr age group. One child (0.15%) died and twenty‐seven (4%) needed intensive care unit (ICU) care. Conclusion: Our study provides recent data on Middle Eastern population, for whom data are sparse. Although it has significantly decreased, the frequency of DKA at presentation of T1DM in children in Kuwait is still high, secondary to the high prevalence of diabetes in the community. Young children, especially those less than 2 yr old remain at high risk. Increasing the general awareness of the public as well as of pediatricians to the disease may lead to early diagnosis before the development of acidosis.  相似文献   
109.

Background

The aim of this study was to investigate the effect of salpingectomy on ovarian function by measuring AMH.

Methods

This study was a balanced, single-center, double-blind, randomized, controlled trial in Ruin Tan Arash Hospital, Tehran, between May 2013 and November 2014. A total of 30 patients undergoing elective abdominal hysterectomy were randomized into two groups, 15 with salpingectomy and 15 without salpingectomy. The primary objective of this study was to compare mean difference of anti-Mullerian hormone (AMH) between two groups. The secondary outcomes measured were follicle-stimulating hormone (FSH), operative time, and blood loss.

Results

Serum AMH levels decreased at 3 months after hysterectomy in all patients (pre AMH 1.32 ± (0.91); post AMH 1.05 ± (0.88), P < 0.001), the salpingectomy group (pre AMH 1.44 ± (0.94); post AMH 1.13 ± (0.86), P < 0.001), and no salpingectomy group (pre AMH 1.2 ± (0.9); post AMH 0.97 ± (0.92), P < 0.001). The rate of decline of AMH levels after surgery did not differ between the two groups (25% (17–33%) vs. 26% (15–36%), P = 0.23) among the women with salpingectomy versus without salpingectomy, respectively. There was no difference in the mean operative time (mean difference 0.33, 95% CI ??22.21 to 22.86, P < 0.92), mean blood loss (mean difference ??0.66, 95% CI ??15.8 to 14.46, P < 0.97), and post FSH (mean difference 0.34, 95% CI ??1.2 to 1.88, P < 0.65) between both groups.

Conclusions

Salpingectomy with abdominal hysterectomy is a safe treatment that does not have a deleterious effect on ovarian reserve.

Trial registration

Iranian Registry of Clinical Trials, IRCT2014123118866N4 (www.IRCT.ir)
  相似文献   
110.
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