全文获取类型
收费全文 | 8005篇 |
免费 | 504篇 |
国内免费 | 159篇 |
专业分类
耳鼻咽喉 | 123篇 |
儿科学 | 90篇 |
妇产科学 | 158篇 |
基础医学 | 1400篇 |
口腔科学 | 121篇 |
临床医学 | 769篇 |
内科学 | 1413篇 |
皮肤病学 | 248篇 |
神经病学 | 470篇 |
特种医学 | 426篇 |
外科学 | 1008篇 |
综合类 | 106篇 |
一般理论 | 2篇 |
预防医学 | 348篇 |
眼科学 | 147篇 |
药学 | 716篇 |
中国医学 | 134篇 |
肿瘤学 | 989篇 |
出版年
2023年 | 46篇 |
2022年 | 148篇 |
2021年 | 306篇 |
2020年 | 135篇 |
2019年 | 216篇 |
2018年 | 269篇 |
2017年 | 221篇 |
2016年 | 304篇 |
2015年 | 427篇 |
2014年 | 450篇 |
2013年 | 519篇 |
2012年 | 732篇 |
2011年 | 727篇 |
2010年 | 463篇 |
2009年 | 366篇 |
2008年 | 537篇 |
2007年 | 499篇 |
2006年 | 407篇 |
2005年 | 380篇 |
2004年 | 301篇 |
2003年 | 224篇 |
2002年 | 190篇 |
2001年 | 101篇 |
2000年 | 104篇 |
1999年 | 68篇 |
1998年 | 51篇 |
1997年 | 49篇 |
1996年 | 51篇 |
1995年 | 33篇 |
1994年 | 27篇 |
1993年 | 30篇 |
1992年 | 15篇 |
1991年 | 20篇 |
1990年 | 20篇 |
1989年 | 27篇 |
1988年 | 19篇 |
1987年 | 22篇 |
1986年 | 17篇 |
1985年 | 27篇 |
1984年 | 7篇 |
1983年 | 10篇 |
1982年 | 11篇 |
1981年 | 13篇 |
1980年 | 8篇 |
1979年 | 4篇 |
1977年 | 7篇 |
1976年 | 8篇 |
1975年 | 11篇 |
1974年 | 4篇 |
1971年 | 4篇 |
排序方式: 共有8668条查询结果,搜索用时 0 毫秒
11.
Background: The fabrication of dental prosthesis requires the transfer of interocclusal records from patient's mouth to semiadjustable articulators using different kinds of recording media. Any inaccuracy in these interocclusal records leads to occlusal errors in the final prosthesis. This study was conducted to evaluate the dimensional changes occurring in the interocclusal recording material over a given period of time and the material's resistance to compression during the cast mounting on the articulator. 相似文献
12.
13.
14.
15.
Ischemic necrosis of the entire femoral head and rapidly destructive hip disease: potential causative relationship 总被引:6,自引:0,他引:6
Kyung Nam Ryu Eui Jong Kim Myung Chul Yoo Yong Koo Park David J. Sartoris Donald Resnick 《Skeletal radiology》1997,26(3):143-149
Objective. Rapidly destructive hip disease (RDHD) is an uncommon disorder of the hip that has been considered a disease of unknown cause
and distinct from ischemic necrosis of the femoral head. The objective of this study was to investigate ischemic necrosis
of the femoral head as one potential cause of RDHD. Design and patients. In 600 patients who underwent MR imaging of the hip, 20 cases of ischemic necrosis involving the entire femoral head in 18
patients (3%) were retrospectively studied with routine radiography and MR imaging. All patients had surgically confirmed
ischemic necrosis of the femoral head. Results and conclusions. All patients showed rapid destruction of the femoral head on routine radiography and MR imaging as compared with the gradual
onset of clinical symptoms. Plain radiographs showed several bone fragments at the inferomedial aspect of the femoral head
(75%), acetabular erosions (55%), eccentric depression at the lateral articular surface of the femoral head conforming to
the adjacent acetabulum (35%), and mild osteoarthritis (15%). Bone sclerosis was often present at sites of impaction between
the femoral head and the acetabulum. MR imaging showed marked distention of the joint capsule in all cases. In 14 of 20 cases,
the contents of the joint space showed predominantly low or intermediate signal intensity on T1- and T2-weighted images. Ischemic
necrosis involving the entire femoral head may represent one of the causes of RDHD. 相似文献
16.
Byung Hoon Han Myung Hwan Park Yong Nam Han Lin Keun Woo 《Archives of pharmacal research》1986,9(1):21-23
Over twelve alkaloids were delected in the roots ofPanax ginseng C.A. Meyer. Among them three alkaloids were isolated and were identified as N9-formylharman, ethyl β-carboline-1-carboxylate and perlolyrine on the basis of spectroscopic studies. 相似文献
17.
Hyun Chul Kim Sang Woo Nam Yong Keun Cho Hey Jin Jeong Se In Kim Seong Hun Kim Chul Min An In Hee Kim Sang Wook Kim Seung Ok Lee Soo Teik Lee 《Taehan Sohwagi Hakhoe chi》2006,47(3):233-237
Although adenocarcinoma is a well known complication of chronic inflammatory bowel disease, primary gastrointestinal lymphoma occurring in Crohn's disease is rare. A 40-year-old man with 10 year-history of Crohn's disease had multiple longitudinal ulcerative lesions on descending colon in follow-up colonoscopic examination. Microscopic examination of proximal descending colon revealed peripheral T cell lymphoma and other site of the descending colon was consistent with Crohn's disease. The patient reached complete remission of malignant lymphoma after three cycles of combined chemotherapy. He has been well for 10 months with sulfasalazine maintenance therapy but was admitted to the hospital due to spontaneous bowel perforation of ascending colon. Right hemicolectomy was done, but the patient died of post-surgical recurrent mesenteric abscess and sepsis. To the best of our knowledge, this is the first case of Non-Hodgkin's lymphoma complicating Crohn's disease in Korea which was confirmed by immunohistochemical studies. 相似文献
18.
Hemorrhagic disseminated intravascular coagulation (DIC) associated with the presence of underlying advanced or metastatic tumors are often difficult to control by conventional methods. We report the use of recombinant activated factor VII (rFVIIa) in patients with cancer and bleeding secondary to DIC. A total of 18 patients with cancer met pre-defined criteria for DIC. All patients had failed to respond to transfusion with blood products and treatment of the underlying malignancy prior to the introduction of rFVIIa. The median laboratory data at the time of treatment with rFVIIa were as follows: hemoglobin, 7.7 g/dl; platelets, 54 x 10(9)/l; prothrombin time, 21 s; activated partial thromboplastin time, 41 s fibrinogen, 83 mg/dl; D-dimer, 17 microg/ml; and antithrombin, 32%. The dose of rFVIIa was 90 microg/kg and the median number of doses administered was 5 (range, 3-10). Serial measurements of coagulation parameters were obtained at frequent intervals during treatment with rFVIIa. Of the 18 patients, 15 responded with cessation of bleeding and improvement in coagulation data. The prothrombin time and activated partial thromboplastin time normalized in all responding patients within 24 h of treatment. The median fibrinogen was 214 mg/dl while the median D-dimer was 6 microg/dl at 48 h following the administration of rFVIIa. No thromboembolic complications were observed following rFVIIa. Our data provide evidence that rFVIIa can be used successfully to control the hemorrhagic episodes associated with DIC. Although this type of treatment appears to be safe, close monitoring of the patients is warranted. 相似文献
19.
20.
The utilization of a probe with synthetic diamond as the sensing material developed to measure radiation doses from mammography X-ray beams is described. The computer code system PENELOPE was used, with a geometry model simulating the experimental conditions, to compute the doses from the mammography X-ray beams to the diamond sensing material. The orientation of the diamond sensor to provide maximum absorption of the incident X-ray beam during exposure was also investigated using the PENELOPE code. The results from the theoretical model and experimental measurements are compared. 相似文献