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   2974篇
  免费   196篇
  国内免费   28篇
耳鼻咽喉   120篇
儿科学   105篇
妇产科学   136篇
基础医学   304篇
口腔科学   132篇
临床医学   281篇
内科学   690篇
皮肤病学   64篇
神经病学   128篇
特种医学   149篇
外科学   724篇
综合类   38篇
一般理论   2篇
预防医学   69篇
眼科学   77篇
药学   82篇
中国医学   6篇
肿瘤学   91篇
  2023年   20篇
  2022年   25篇
  2021年   85篇
  2020年   35篇
  2019年   55篇
  2018年   65篇
  2017年   56篇
  2016年   93篇
  2015年   110篇
  2014年   132篇
  2013年   166篇
  2012年   210篇
  2011年   189篇
  2010年   118篇
  2009年   126篇
  2008年   214篇
  2007年   224篇
  2006年   194篇
  2005年   175篇
  2004年   161篇
  2003年   126篇
  2002年   111篇
  2001年   51篇
  2000年   70篇
  1999年   38篇
  1998年   10篇
  1997年   16篇
  1996年   19篇
  1995年   16篇
  1994年   12篇
  1992年   24篇
  1991年   21篇
  1990年   13篇
  1989年   11篇
  1988年   12篇
  1987年   14篇
  1986年   13篇
  1985年   14篇
  1984年   13篇
  1983年   15篇
  1981年   11篇
  1980年   7篇
  1979年   13篇
  1977年   6篇
  1975年   9篇
  1973年   12篇
  1970年   7篇
  1969年   10篇
  1968年   6篇
  1966年   5篇
排序方式: 共有3198条查询结果,搜索用时 15 毫秒
991.
Arslan E  Aksoy A 《The Laryngoscope》2007,117(6):990-996
Background : Dorsal hump reduction is a critical step in rhinoplasty. Most of the reasons behind revisional procedures are related to incorrect hump reduction. Methods : The authors used a modified dorsal hump reduction method in their primary cases, the steps of which are as follows: 1) dissection of the nasal vault; 2) bilateral submucoperichondrial dissections to free the cartilaginous septum; 3) separation of the upper lateral cartilages from the cartilaginous septum; 4) partial dissection of the upper lateral cartilages from the inner surfaces of the nasal bones bilaterally; 5) separation of the bony septum from the nasal bones bilaterally; 6) reduction of the partially isolated nasal bones; 7) en bloc cartilaginous and bony septum removal. The authors have operated on 68 primary cases over a 2 year period (30 mo). Results : In the great majority of cases, the results were satisfactory. No revisions were performed in this patient group. Conclusions : This method is a good alternative to traditional techniques in noses with a high and narrow roof, thin skin, and weak middle nasal vault. Revision could be performed more easily when required. Initially, wide noses may not seem good candidates for this procedure; however, careful case‐based preoperative planning may overcome this difficulty.  相似文献   
992.
993.
994.

Objective

To investigate the relationship between vasomotor symptoms (hot flashes) and osteopenia or osteoporosis in perimenopausal women.

Method

In this cross-sectional study 79 perimenopausal women aged between 45 and 55 years and seen at the Gynecology or Menopause Outpatient Clinic of Marmara University School of Medicine were allotted to one of 2 groups according to the presence or absence of hot flashes. The groups were then compared for bone mineral density (BMD) of the lumbar vertebrae, as measured by dual energy X-ray absorptiometry.

Results

The mean BMD measurement for vertebrae L2 to L4 was 0.32 ± 0.19 for the group with no hot flashes and  − 0.53 ± 0.21 for the group with hot flashes (P = 0.007). In the former, 6.1% of the women and in the latter, 32.6% of the women had a BMD value less than a 1.5 standard deviation from the mean (P = 0.005).

Conclusion

Women with vasomotor symptoms are more prone to have osteopenia or osteoporosis.  相似文献   
995.
Sevinc A  Camci C 《Chemotherapy》2009,55(1):11-14
Few recent developments in oncology have generated comparable interest as have the dramatic successes in the therapy of gastrointestinal stromal tumors (GIST) with imatinib mesylate. Imatinib, a selective tyrosine kinase inhibitor, is currently the standard of care first-line treatment for unresectable or metastatic GIST, improving survival time and delaying disease progression. The authors report a 50-year-old male patient referred as relapsed chemotherapy-resistant CD117- leiomyosarcoma. After learning about the failure of chemotherapy, the patient became depressive and considered committing a suicide. We performed a second CD117 staining. As the second analysis was found to be positive, the diagnosis of leiomyosarcoma was changed to GIST. Imatinib 600 mg/day was started. The result with imatinib was appraised as a partial response/stable disease after the chemotherapy failure. The patient's depressive mood was also improved after imatinib. The medical and paramedical perspectives of the case are presented to emphasize the importance of immunohistochemical staining and its inhibition by a novel tyrosine kinase inhibitor in GIST. All nonepithelial tumors, particularly nonepithelial abdominal tumors of leiomyoblastic appearance should be considered to be GIST unless an experienced pathologist who does CD117 staining routinely confirms a different diagnosis. Interestingly, depression due to chemotherapy failure was also alleviated with imatinib. According to a recent study, median time to progression was 24 months, and overall survival was 57 months, reaching 5 years with imatinib. Conclusion: time is a GIFT in GIST.  相似文献   
996.
997.
This study evaluates the progression of stenosis, onset and progression of aortic regurgitation (AR), and the results of surgical outcomes in children with isolated discrete subaortic stenosis (SAS). The medical records of 108 patients (mean age, 5.5 ± 3.8 years; range, 3 days to 18 years) with isolated discrete SAS were reviewed. Patients with lesions other than AR were excluded. Very mild stenosis was defined as Doppler peak systolic instantaneous gradient (PSIG) less than 25 mmHg, mild stenosis as 25–49 mmHg, moderate stenosis as 50–75 mmHg, and severe stenosis as more than 75 mmHg. Seventy-eight of 108 patients were followed for 2 months to 14 years (mean, 4.8 ± 3.7 years; median, 5 years) with medical treatment alone. In these patients, the mean PSIG at last echocardiogram was higher than the mean PSIG at initial echocardiogram (39 ± 19 vs 31 ± 12 mmHg, respectively; p < 0.001). Among 24 patients with very mild stenosis at initial echocardiogram, 10 had mild and 2 had moderate stenosis after a mean period of 5.6 years. Among 46 patients with mild stenosis at initial echocardiogram, 11 had moderate and 5 had severe stenosis after a mean period of 4.1 years. Only 1 patient among the 8 patients with moderate stenosis at initial echocardiogram had severe stenosis after a mean period of 2.7 years. Thirty-nine patients (50%) had AR (13% trivial, 33% mild, and 4% moderate) at initial echocardiogram. After a mean period of 4.8 years, 77% of the patients had AR (10% trivial, 53% mild, 9% mild–moderate, and 5% moderate). Twenty-four patients underwent surgery. Preoperatively, mean Doppler PSIG and AR incidence were 64 ± 17 mmHg and 91% (22/24), respectively. The mean Doppler PSIG was 30 ± 19 mmHg and AR was present in all of the patients a mean period of 4.1 years after surgery. Two patients underwent reoperation for recurrent SAS and AR. Patients with very mild or mild stenosis may be followed noninvasively every year. One patient of the 8 patients with moderate stenosis progressed to severe stenosis, and moderate AR developed in 2 patients after a mean of 2.7 years. We recommend that patients with moderate stenosis undergo careful evaluation to determine whether surgery is necessary due to the severity of stenosis and AR.  相似文献   
998.
999.
1000.
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