全文获取类型
收费全文 | 10781篇 |
免费 | 717篇 |
国内免费 | 51篇 |
专业分类
耳鼻咽喉 | 100篇 |
儿科学 | 278篇 |
妇产科学 | 313篇 |
基础医学 | 1483篇 |
口腔科学 | 316篇 |
临床医学 | 924篇 |
内科学 | 2115篇 |
皮肤病学 | 232篇 |
神经病学 | 720篇 |
特种医学 | 301篇 |
外科学 | 1629篇 |
综合类 | 388篇 |
一般理论 | 6篇 |
预防医学 | 1033篇 |
眼科学 | 268篇 |
药学 | 811篇 |
中国医学 | 76篇 |
肿瘤学 | 556篇 |
出版年
2023年 | 82篇 |
2022年 | 180篇 |
2021年 | 358篇 |
2020年 | 203篇 |
2019年 | 299篇 |
2018年 | 338篇 |
2017年 | 248篇 |
2016年 | 246篇 |
2015年 | 294篇 |
2014年 | 355篇 |
2013年 | 449篇 |
2012年 | 769篇 |
2011年 | 770篇 |
2010年 | 397篇 |
2009年 | 339篇 |
2008年 | 544篇 |
2007年 | 576篇 |
2006年 | 528篇 |
2005年 | 500篇 |
2004年 | 482篇 |
2003年 | 409篇 |
2002年 | 404篇 |
2001年 | 315篇 |
2000年 | 361篇 |
1999年 | 276篇 |
1998年 | 108篇 |
1997年 | 73篇 |
1996年 | 62篇 |
1995年 | 64篇 |
1994年 | 46篇 |
1993年 | 48篇 |
1992年 | 126篇 |
1991年 | 114篇 |
1990年 | 130篇 |
1989年 | 119篇 |
1988年 | 88篇 |
1987年 | 93篇 |
1986年 | 83篇 |
1985年 | 69篇 |
1984年 | 50篇 |
1983年 | 50篇 |
1982年 | 51篇 |
1981年 | 40篇 |
1979年 | 45篇 |
1978年 | 41篇 |
1977年 | 36篇 |
1976年 | 36篇 |
1975年 | 30篇 |
1974年 | 32篇 |
1973年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
1.
Sim Sai TIN Viroj WIWANITKIT 《Revista do Instituto de Medicina Tropical de S?o Paulo》2015,57(2):184-Apr;57(2):184
2.
3.
4.
Paula Cristina Galati Paula Garcia Chiarello Belinda Pinto Simões 《Nutrition and cancer》2016,68(1):86-93
Changes in resting energy expenditure (REE) of cancer patients vary depending on type of tumor, treatment time point and kind of treatment. Little is known about REE of acute leukemia adult patients after treatment, especially with results related to body weight or fat free mass (FFM). This study aimed to assess changes in REE of acute leukemia adult patients before and after the first remission induction. Evaluation of REE was performed by indirect calorimetry and predicted REE was calculated by Harris-Benedict equation. Weight and height were measured and compared to a control group of healthy individuals. FFM was assessed by bioelectrical impedance for adjusting REE values. We evaluated 18 patients and 26 healthy individuals. At diagnosis, patients presented REE, REE/weight, and REE/FFM higher than the controls. Reductions of REE, REE/weight, and REE/FFM were also observed in patients after the first cycle of chemotherapy. The predicted REE for the patients group showed significant lower value compared with measured REE. Before the first cycle of chemotherapy REE was increased but undergoes a reduction after treatment, reaching values similar to the controls. For predictive Harris-Benedict equation, stress factors should be added to avoid underestimation of REE before and after chemotherapy. 相似文献
5.
6.
Jorge Guardado Carlos Cotrim Otília Sim?es Sofia Almeida Mário Ialá Luís Lopes Hélder Pereira Manuel Carrageta 《Revista portuguesa de cardiologia》2006,25(4):409-415
INTRODUCTION: Transesophageal echocardiography (TEE) has become increasingly useful in the study of patients with suspected pulmonary thromboembolism. OBJECTIVE: The aim of this study was to prospectively evaluate the usefulness of TEE in the study of the distal part of the left pulmonary artery (LPA) as well as the influence of this procedure on total echocardiographic exam duration. METHODOLOGY: A prospective study in two groups of consecutive patients referred for TEE with a one- year interval between evaluation of Group A: 33 patients, 17 male, mean age 54 +/- 24 years, and Group B: 42 patients, 20 male, mean age 48 +/- 27 years (p = NS). The procedure was considered long when it took more than 3 min to evaluate the distal part of the LPA. RESULTS: In group A we were able to visualize the distal part of the LPA in 24 patients (73%) without significant prolongation of total exam duration in 16 patients (48% of group A). In one of the patients with suspected pulmonary thromboembolism thrombi were only observed in the distal part of the LPA. In group B we were able to visualize the distal part of the LPA in 36 patients (86%) without significant prolongation of total exam duration in 26 patients (61% of group B). CONCLUSIONS: 1. Visualization of the distal part of the LPA was possible in more patients, and with TEE time prolongation in less patients, in group B. These differences can be accounted for by the training of the operator in this technique. 2. The importance of visualization of this part of the LPA in guiding treatment in the subset of patients with pulmonary thromboembolism confirms the usefulness of this specific procedure. 相似文献
7.
8.
9.
10.
Seok L Ong Gianpiero Gravante Cristina A Pollard M'Balu A Webb Severine Illouz Ashley R Dennison 《HPB : the official journal of the International Hepato Pancreato Biliary Association》2009,11(8):613-621
Pain control is one of the most challenging aspects in the management of chronic pancreatitis. Total pancreatectomy can successfully relieve the intractable abdominal pain in these patients but will inevitably result in insulin-dependent diabetes. Islet autotransplantation aims to preserve, as far as possible, the insulin secretory function of the islet cell mass thereby reducing (or even removing) the requirement for exogenous insulin administration after a total pancreactomy. Despite the relatively small number of centres able to perform these procedures, there are important technical variations in the details of their approaches. The aim of this review is to provide details of the current surgical practice for total pancreatectomy combined with islet autotransplantation, and outline the potential advantages and disadvantages of the variations adopted in each centre. 相似文献