全文获取类型
收费全文 | 2281篇 |
免费 | 129篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 13篇 |
儿科学 | 40篇 |
妇产科学 | 3篇 |
基础医学 | 319篇 |
口腔科学 | 45篇 |
临床医学 | 155篇 |
内科学 | 509篇 |
皮肤病学 | 31篇 |
神经病学 | 209篇 |
特种医学 | 204篇 |
外科学 | 413篇 |
综合类 | 4篇 |
预防医学 | 104篇 |
眼科学 | 162篇 |
药学 | 76篇 |
肿瘤学 | 127篇 |
出版年
2023年 | 8篇 |
2022年 | 28篇 |
2021年 | 38篇 |
2020年 | 27篇 |
2019年 | 46篇 |
2018年 | 70篇 |
2017年 | 45篇 |
2016年 | 47篇 |
2015年 | 47篇 |
2014年 | 72篇 |
2013年 | 78篇 |
2012年 | 127篇 |
2011年 | 144篇 |
2010年 | 97篇 |
2009年 | 96篇 |
2008年 | 140篇 |
2007年 | 144篇 |
2006年 | 114篇 |
2005年 | 136篇 |
2004年 | 124篇 |
2003年 | 118篇 |
2002年 | 102篇 |
2001年 | 44篇 |
2000年 | 31篇 |
1999年 | 39篇 |
1998年 | 37篇 |
1997年 | 22篇 |
1996年 | 22篇 |
1995年 | 17篇 |
1994年 | 16篇 |
1993年 | 15篇 |
1992年 | 37篇 |
1991年 | 15篇 |
1990年 | 15篇 |
1989年 | 11篇 |
1988年 | 12篇 |
1987年 | 15篇 |
1986年 | 11篇 |
1985年 | 11篇 |
1984年 | 10篇 |
1974年 | 7篇 |
1937年 | 8篇 |
1935年 | 10篇 |
1934年 | 8篇 |
1933年 | 19篇 |
1932年 | 16篇 |
1931年 | 9篇 |
1930年 | 12篇 |
1928年 | 11篇 |
1926年 | 7篇 |
排序方式: 共有2414条查询结果,搜索用时 0 毫秒
41.
Sylvia Baumann Kurer Burkhardt Seifert Beat Michel† Regula Ruegg Jörg Fehr 《British journal of haematology》1995,91(4):820-826
Summary. We prospectively studied 45 anaemic patients (3 7 women, 8 men) with chronic inflammatory rheumatic diseases. The combination of serum ferritin and CRP (as well as ESR) in its predictive capacity for bone marrow iron stores was examined. The relationship between other iron-related measurements (transferrin, transferrin saturation, soluble transferrin receptor, erythrocyte porphyrins and percentage of hypochromic/microcytic erythrocytes) and bone marrow iron stores was also investigated. Stainable bone marrow iron was taken as the most suitable standard to separate iron-deficient from iron-replete patients. 14 patients (31%) were lacking bone marrow iron. Regression analysis showed a good correlation between ferritin and bone marrow iron (adjusted R 2 =0.721, P<00001). The combination of ferritin and CRP (ESR) did not improve the predictive power for bone marrow iron (adjusted R 2 =0.715) in this cohort of patients with low systemic inflammatory activity. With respect to the bone marrow iron content the best predictive cut-off value of ferritin was 30μg/l (86% sensitivity, 90% specificity). The other iron-related parameters both individually and when combined were less powerful in predicting bone marrow iron than ferritin alone. Only zinc bound erythrocyte protoporphyrin in combination with ferritin slightly improved prediction (adjusted R 2 =0.731). A cut-off point of 11% hypochromic erythrocytes reached a high specificity (90%), but was less sensitive (77%). 相似文献
42.
43.
44.
J Sauar G Hoff T Hausken A Bj?rkheim A Foerster P Mowinckel 《Scandinavian journal of gastroenterology》1992,27(8):667-672
Colonoscopy was offered to 206 first-degree relatives of 181 patients operated on for colorectal cancer (CRC). Findings of polyps in relatives correlated with Dukes staging, extent of dedifferentiation and localization of tumour in the operated patient, and type of family relationship. Adenomas in relatives and Dukes staging of carcinoma in the patients were inversely related. Relatives of patients with Dukes stage A tumour had more than twice as many adenomas as and a higher prevalence of multiple adenomas than relatives of patients with advanced cancer at the time of operation. If the patient had polyp(s) in addition to tumour, the number of adenomas per relative was almost doubled. Hyperplastic polyps in relatives were associated with poorly differentiated carcinoma in their related patients. These results support the theory that not all CRC are derived from polyps and that adenoma-derived CRC may have a better prognosis than 'de novo' CRC. An adenoma prevalence risk table is also presented. 相似文献
45.
Broers B Helbling B François A Schmid P Chuard C Hadengue A Negro F;Swiss Association for the Study of the Liver 《Journal of hepatology》2005,42(3):323-328
BACKGROUND/AIMS: Treatment with interferon-alpha (IFN-alpha) may eradicate HCV in most acute hepatitis C patients, thus preventing chronic hepatitis and avoiding less efficacious combination therapy. METHODS: In a prospective study, we evaluated the impact of barriers to successful start and completion of treatment of acute and subacute (<12 months from infection) hepatitis C with pegylated IFN-alpha2b, 1.5 microg/kg, QW, for 24 weeks. RESULTS: Out of 27 patients (22 were active intravenous drug users [IVDU]), 5 cleared HCV spontaneously. Antiviral treatment was indicated in 22 patients: six refused therapy for fear of side effects, whereas two others were lost to observation. Eight patients completed the treatment or received >80% of the scheduled drug: seven (88%) were sustained virological responders 24 weeks after the end of treatment. Six patients (all IVDU) stopped prematurely due to side effects: only one had a sustained virological response. Based on an intent-to-treat analysis, and considering all 14 patients in whom at least one dose of drug was administered, only 8 (57%) became sustained virological responders. CONCLUSIONS: Treatment of acute hepatitis C with pegylated IFN-alpha is highly beneficial, but its effectiveness is affected by a poor rate of acceptance and/or adherence to currently available regimens, especially in IVDU and women. 相似文献
46.
47.
Rahul S. Bhansali Malini Rammohan Paul Lee Anouchka P. Laurent Qiang Wen Praveen Suraneni Bon Ham Yip Yi-Chien Tsai Silvia Jenni Beat Bornhauser Aurlie Siret Corinne Fruit Alexandra Pacheco-Benichou Ethan Harris Thierry Besson Benjamin J. Thompson Young Ah Goo Nobuko Hijiya Maria Vilenchik Shai Izraeli Jean-Pierre Bourquin Sbastien Malinge John D. Crispino 《The Journal of clinical investigation》2021,131(1)
48.
Alba Tristán-Noguero PhD Eva Borràs PhD Marta Molero-Luis PhD Tessa Wassenberg MD PhD Tessa Peters MSc Marcel M. Verbeek PhD Michel Willemsen MD PhD Thomas Opladen MD PhD Kathrin Jeltsch PhD Roser Pons MD PhD Beat Thony PhD Gabriella Horvath MD Zuhal Yapici MD Jennifer Friedman MD Keith Hyland PhD Guillermo E. Agosta MD Eduardo López-Laso MD Rafael Artuch MD PhD Eduard Sabidó PhD Àngels García-Cazorla MD PhD 《Movement disorders》2021,36(3):690-703
49.
Carl-Peter Cornelius Tobias Stiebler Peter Mayer Wenko Smolka Christoph Kunz Beat Hammer Claude Jaquiéry C Carlos Buitrago-Téllez Christoph Sebastian Leiggener Marc Christian Metzger Frank Wilde Laurent Audigé Monika Probst Edward Bradley Strong Noemi Castelletti Joachim Prein Florian Andreas Probst 《Journal of cranio-maxillo-facial surgery》2021,49(7):598-612
ObjectiveThis retrospective study evaluates the occurrence and frequency of different fracture patterns in a series of computed tomography (CT) scans in terms of the AOCMF Trauma Classification (TC) orbit module and correlates the assigned defects with measurements of the fracture area in order to get an approximate guideline for fracture size predictions on the basis of the classification.Material and methodsCT scans of patients with orbital floor fractures were evaluated using the AOCMFTC to determine the topographical subregions. The coding consisted of: W = orbital wall, 1 = anterior orbit, 2 = midorbit, i = inferior, m = medial. The 3-dimensional surface area size of the fractures was quantified by the “defect body” method (Brainlab, Munich, Germany). The fracture area size and its confidence and prediction interval within each topographical subregion was estimated by regression analysis.ResultsA total of 137 CT scans exhibited 145 orbital floor fractures, which were combined with 34 medial orbital wall fractures in 31 patients. The floor fractures – W1(i)2(i) (n = 86) and W1(i) (n = 19) were the most frequent patterns. Combined floor and medial wall fractures most frequently corresponded to the pattern W1 (im)2 (im) (n = 15) ahead of W1 (im) 2(i) (n = 10). The surface area size ranged from 0.11 cm2 to 6.09 cm2 for orbital floor and from 0.29 cm2 to 5.43 cm2 for medial wall fractures.The prediction values of the mean fracture area size within the subregions were computed as follows: W1(i) = 2.25 cm2, W2(i) = 1.64 cm2, W1(i)2(i) = 3.10 cm2, W1(m) = 1.36 cm2, W2(m) = 1.65 cm2, W1(m)2(m) = 2.98 cm2, W1 (im) = 3.35 cm2, W1 (im) 2(i) = 4.63 cm2, W1 (im)2(m) = 4.06 cm2 and W1 (im)2 (im) = 7.16 cm2.ConclusionThe AOCMFTC orbital module offers a suitable framework for topographical allocation of fracture patterns inside the infero-medial orbital cavity. The involvement of the subregions is of predictive value providing estimations of the mean 3-D fracture area size. 相似文献
50.
Treatment of pleural malignancies by photo‐induction combined to systemic chemotherapy: Proof of concept on rodent lung tumors and feasibility study on porcine chest cavities 下载免费PDF全文