全文获取类型
收费全文 | 206641篇 |
免费 | 8879篇 |
国内免费 | 593篇 |
专业分类
耳鼻咽喉 | 2575篇 |
儿科学 | 5977篇 |
妇产科学 | 4956篇 |
基础医学 | 29090篇 |
口腔科学 | 6256篇 |
临床医学 | 13634篇 |
内科学 | 45502篇 |
皮肤病学 | 5269篇 |
神经病学 | 17764篇 |
特种医学 | 5449篇 |
外国民族医学 | 1篇 |
外科学 | 24602篇 |
综合类 | 932篇 |
一般理论 | 43篇 |
预防医学 | 22754篇 |
眼科学 | 5045篇 |
药学 | 15407篇 |
1篇 | |
中国医学 | 737篇 |
肿瘤学 | 10119篇 |
出版年
2023年 | 1300篇 |
2022年 | 1499篇 |
2021年 | 4164篇 |
2020年 | 2380篇 |
2019年 | 4222篇 |
2018年 | 6551篇 |
2017年 | 4213篇 |
2016年 | 4336篇 |
2015年 | 4882篇 |
2014年 | 5751篇 |
2013年 | 8270篇 |
2012年 | 13766篇 |
2011年 | 14324篇 |
2010年 | 7106篇 |
2009年 | 5554篇 |
2008年 | 11647篇 |
2007年 | 12221篇 |
2006年 | 11538篇 |
2005年 | 11118篇 |
2004年 | 10065篇 |
2003年 | 9366篇 |
2002年 | 8771篇 |
2001年 | 5089篇 |
2000年 | 5604篇 |
1999年 | 4365篇 |
1998年 | 998篇 |
1992年 | 2298篇 |
1991年 | 2061篇 |
1990年 | 2034篇 |
1989年 | 1718篇 |
1988年 | 1641篇 |
1987年 | 1536篇 |
1986年 | 1572篇 |
1985年 | 1480篇 |
1984年 | 1074篇 |
1983年 | 910篇 |
1979年 | 1214篇 |
1978年 | 816篇 |
1977年 | 791篇 |
1976年 | 749篇 |
1975年 | 881篇 |
1974年 | 1124篇 |
1973年 | 1167篇 |
1972年 | 1118篇 |
1971年 | 1077篇 |
1970年 | 1009篇 |
1969年 | 1086篇 |
1968年 | 1108篇 |
1967年 | 978篇 |
1966年 | 879篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
Andrea Berger Michelle Sadeh Gabriel Tzur I Avinoam Shuper Liora Kornreich Dov Inbar Ian J Cohen Shalom Michowiz Isaac Yaniv Shlomi Constantini Eli Vakil 《Journal of the International Neuropsychological Society》2005,11(4):482-487
Cerebellar involvement in motor and non-motor sequence learning was examined with serial reaction time tasks (SRT). Our sample consisted of 8 children and adolescents who had undergone surgical removal of a benign posterior fossa tumor (PFT) during childhood. None of them had undergone chemotherapy or cranial radiation therapy (CRT). Ages ranged from 1-11 years at surgery and 9-17 years at testing. The children were tested not earlier than 2.5 years after surgery (M = 5.9 years), enabling brain plasticity and recovery of functions. Their performance was compared with a matched control sample. The PFT group was not impaired in the implicit learning of sequences, as reflected in their performance in blocks with a repeated sequence, both before and after a random block. However, in the perceptual task, their performance deteriorated more than that of the control group when a random block was introduced, suggesting that it was more difficult for the patients to respond flexibly or change their response set when encountering changing task demands. These results are in line with another study by our group on task switching with the same patients. 相似文献
62.
63.
64.
José Abal Arca Isaura Parente Lamelas Raquel Almazán Ortega José Blanco Pérez María Elena Toubes Navarro Pedro Marcos Velázquez 《Archivos de bronconeumologia》2009,45(10):502-507
Background and objectiveTo analyse frequency, characteristics and patient survival with lung cancer (LC) and Common Obstructive Pulmonary Disease (COPD), comparing them with patients that do not have COPD.Material and methodsA retrospective study, of patients diagnosed by means of cytohistology. Survival was estimated by the Kaplan-Meier method. Statistical analysis was carried out using SPSS 15.0.ResultsA total of 996 patients were diagnosed, 39.8% with COPD. Mean age70±9.19 years. GOLD stages: I 18.2%, II 53.6%, III 24%, IV 4.2%. The histological types: squamous cell carcinoma 48.2%, adenocarcinoma 22%, and small cell carcinoma 22.5%. Survival was longer in the COPD group.ConclusionsLC and COPD are combined in 39.8%. Squamous cell type is more frequent and survival was longer in the COPD group. 相似文献
65.
66.
67.
68.
Angelo M. Carella Sandro Nati Paolo Carlier Daniela Pierluigi Domenico Giordano Angela Congiu Gino Santini Daniele Scarpati Salvina Barra Renzo Corvo Vito Vitale Maria R. Raffo Raffaella Cerri Marco Risso Mauro Spriano Renato Vimercati Ester Pungolino Andrea Bacigalupo Eugenio Damasio 《Leukemia & lymphoma》1991,5(1):43-47
Forty consecutive adult patients under the age of 50 with acute non-lymphoblastic leukemia (ANLL) in first complete remission, underwent autologous bone marrow transplantation (ABMT) between March 1984 and April 1990. The conditioning regimen employed included cyclophosphamide and total body irradiation, followed by the administration of unpurged ABMT. The median time from diagnosis to transplant was 7 months (3-15 months), and the median time from complete remission to ABMT was 4 months (range 3-9 months). Twenty-two (51%) patients remain in complete remission 6-81 months (median 24 months) after ABMT.
The causes of death were, recurrent leukemia (11 patients), parenchymal toxicities such as acute respiratory distress syndrome and veno-occlusive disease (3 patients), hemorrhage (2 patients) and infection (2 patients). Eleven patients relapsed after 3-12 months (median 5 months). This study has produced survival data comparable to those of other institutions employing TBI for either allo or autotransplants. 相似文献
The causes of death were, recurrent leukemia (11 patients), parenchymal toxicities such as acute respiratory distress syndrome and veno-occlusive disease (3 patients), hemorrhage (2 patients) and infection (2 patients). Eleven patients relapsed after 3-12 months (median 5 months). This study has produced survival data comparable to those of other institutions employing TBI for either allo or autotransplants. 相似文献
69.
J. M. Bellón N. García-Honduvilla N. Serrano M. Rodríguez G. Pascual J. Buján 《Hernia》2005,9(4):338-343
The component of a composite prosthesis, which makes contact with the visceral peritoneum, can be reabsorbable or non-reabsorbable,
and laminar or reticular. This study was designed to determine whether the composition of this second, barrier component could
improve its behavior at this interface. Abdominal wall defects in rabbits were repaired using a polypropylene prosthesis (PP),
or the composites Sepramesh (PP+h) or Vicryl (PP+v). Fourteen days after surgery, the implants were evaluated by light and
scanning electron microscopy, and immunohistochemistry. Prosthetic areas occupied by adhesions (PP: 71.08±5.09, PP+h: 18.55±4.96,
P+v: 69.69±16.81%), neoperitoneal thickness (PP: 256.17±21.68, PP+h: 83.11±19.63, PP+v:213.72±35.90 μm) and macrophage counts
(PP: 8.73±1.16, PP+h: 27.33±4.13, PP+v: 31.24±3.08%) showed significant differences (P<0.05). The tested biomaterials induced an optimal recipient tissue infiltration. Least adhesion formation was observed on
the PP+h implants. This suggests that the second component, although reabsorbable, should be smooth in structure. 相似文献
70.
To study the incidence and risk factors of prosthetic valve endocarditis (PVE) we followed 99.5% of 912 patients who had valve replacement from January 1, 1981 through December 31, 1985, for 1 to 6 (mean 3) years. PVE occurred in 27 patients (2.96% or 0.98% per patient-year). The incidence of PVE in the aortic position (3.9%) was significantly higher than in the mitral position (1.5%): p less than 0.25. PVE developed in 19 out of 329 patients with bioprostheses (5.8%) and in 8 out of 583 patients with mechanical valves (1.4%): p less than 0.005. Actuarially at 5 years follow-up 90.7% of the bioprosthetic group and 98.4% of the mechanical valve group was free of PVE (p less than 0.01). Bioprosthetic valve replacement in infective endocarditis further increased the risk of PVE compared to valve replacement by mechanical prostheses. In conclusion: in order of importance antecedent endocarditis, bioprostheses, male sex and aortic position are risk factors in the development of PVE. In patients requiring operation for infective endocarditis, mechanical valves are recommended. As the outcome of PVE is still very grave, authors stress the importance of prophylaxis, early diagnosis and timely operation. 相似文献