全文获取类型
收费全文 | 2941篇 |
免费 | 185篇 |
国内免费 | 16篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 47篇 |
妇产科学 | 33篇 |
基础医学 | 404篇 |
口腔科学 | 101篇 |
临床医学 | 201篇 |
内科学 | 873篇 |
皮肤病学 | 15篇 |
神经病学 | 187篇 |
特种医学 | 98篇 |
外科学 | 587篇 |
综合类 | 9篇 |
预防医学 | 88篇 |
眼科学 | 21篇 |
药学 | 119篇 |
中国医学 | 10篇 |
肿瘤学 | 330篇 |
出版年
2023年 | 16篇 |
2022年 | 40篇 |
2021年 | 85篇 |
2020年 | 42篇 |
2019年 | 64篇 |
2018年 | 89篇 |
2017年 | 62篇 |
2016年 | 78篇 |
2015年 | 75篇 |
2014年 | 86篇 |
2013年 | 156篇 |
2012年 | 234篇 |
2011年 | 197篇 |
2010年 | 119篇 |
2009年 | 97篇 |
2008年 | 201篇 |
2007年 | 194篇 |
2006年 | 171篇 |
2005年 | 174篇 |
2004年 | 179篇 |
2003年 | 153篇 |
2002年 | 135篇 |
2001年 | 48篇 |
2000年 | 50篇 |
1999年 | 44篇 |
1998年 | 23篇 |
1997年 | 26篇 |
1996年 | 17篇 |
1995年 | 12篇 |
1994年 | 20篇 |
1993年 | 22篇 |
1992年 | 27篇 |
1991年 | 25篇 |
1990年 | 25篇 |
1989年 | 13篇 |
1988年 | 12篇 |
1987年 | 13篇 |
1986年 | 15篇 |
1985年 | 15篇 |
1984年 | 10篇 |
1983年 | 6篇 |
1982年 | 8篇 |
1980年 | 7篇 |
1979年 | 9篇 |
1977年 | 7篇 |
1976年 | 4篇 |
1975年 | 4篇 |
1974年 | 5篇 |
1973年 | 3篇 |
1972年 | 4篇 |
排序方式: 共有3142条查询结果,搜索用时 0 毫秒
81.
Maritza Del Carmen Quezada‐Conde Patricia de Lourdes Alvarez‐Velasco Edisson Fernando Lopez Marco Vinicio Medina Renata Pereira de Samuel Marques Marcia Turolla Wanderley E. Michel-Crosato Claudio Mendes Pannuti Antonio Carlos Frias Daniela Prcida Raggio Fausto Medeiros Mendes 《Dental traumatology》2020,36(5):510-517
82.
Cossu F Vulliamy TJ Marrone A Badiali M Cao A Dokal I 《British journal of haematology》2002,119(3):765-768
X-linked Hoyeraal-Hreidarsson syndrome (XL-HHS) is the severe infantile variant of X-linked dyskeratosis congenita (XL-DC) and both are due to mutations in the DKC1 gene within Xq28. We report a novel missense mutation in DKC1 exon 3 (T113-->C, Ile38Thr) in a Sardinian infant with XL-HHS in whom the disease was characterized by 'T+B-NK-' severe combined immunodeficiency and bone marrow failure. He underwent sibling bone marrow transplantation using a conditioning regimen (fludarabine, rabbit antithymocyte globulin, low-dose melphalan) selected according to the HHS/DC phenotype. This was associated with low toxicity, prompt engraftment with adequate immune reconstitution and full donor haemopoiesis. 相似文献
83.
Zoico E Zamboni M Adami S Vettor R Mazzali G Tosoni P Bissoli L Bosello O 《Clinical endocrinology》2003,59(1):97-103
OBJECTIVE: To assess the relationship between circulating leptin levels, bone mineral content and density in the elderly. DESIGN: A cross-sectional study. PATIENTS: A cohort of 92 men and 171 women, with ages ranging from 68 to 75 years, selected as a healthy and normal functioning group, in the city centre of Verona. MEASUREMENTS: Plasma leptin levels were determined in each participant. Body composition was evaluated with dual energy X-ray absorptiometry (DXA). Bone mineral content (BMC) and bone mineral density (BMD) were measured at whole-body, hip and femoral neck level in all subjects. RESULTS: In both men and women a significant relationship between fat mass and whole-body BMC or BMD was found. The strength of this association was consistently reduced after adjustment for plasma leptin. A significant association between circulating leptin levels, whole-body, total hip and femoral neck BMC and BMD was found in both sexes. This association retained the statistical significance after adjustment for fat mass percentage, especially in women. In stepwise multiple linear regression analyses, leptin was shown to be a significant predictor of whole-body, total hip and femoral neck BMC and BMD, independently of age and the percentage of body fat in both sexes. The circulating levels of leptin accounted for a variance in whole-body BMC of 8.9% in men and 18.2% in women, and in whole-body BMD of 10.6% in women. CONCLUSION: Our data show a significant relationship between leptin, bone mineral mass and density in healthy elderly men and women. 相似文献
84.
Platelet-derived growth factor C induces liver fibrosis, steatosis, and hepatocellular carcinoma 总被引:16,自引:0,他引:16 下载免费PDF全文
Campbell JS Hughes SD Gilbertson DG Palmer TE Holdren MS Haran AC Odell MM Bauer RL Ren HP Haugen HS Yeh MM Fausto N 《Proceedings of the National Academy of Sciences of the United States of America》2005,102(9):3389-3394
Members of the platelet-derived growth factor (PDGF) ligand family are known to play important roles in wound healing and fibrotic disease. We show that both transient and stable expression of PDGF-C results in the development of liver fibrosis consisting of the deposition of collagen in a pericellular and perivenular pattern that resembles human alcoholic and nonalcoholic fatty liver disease. Fibrosis in PDGF-C transgenic mice, as demonstrated by staining and hydroxyproline content, is preceded by activation and proliferation of hepatic stellate cells, as shown by collagen, alpha-smooth muscle actin and glial fibrillary acidic protein staining and between 8 and 12 months of age is followed by the development of liver adenomas and hepatocellular carcinomas. The hepatic expression of a number of known profibrotic genes, including type beta1 TGF, PDGF receptors alpha and beta, and tissue inhibitors of matrix metalloproteinases-1 and -2, increased by 4 weeks of age. Increased PDGF receptor alpha and beta protein levels were associated with activation of extracellular regulated kinase-1 and -2 and protein kinase B. At 9 months of age, PDGF-C transgenic mice had enlarged livers associated with increased fibrosis, steatosis, cell dysplasia, and hepatocellular carcinomas. These studies indicate that hepatic expression of PDGF-C induces a number of profibrotic pathways, suggesting that this growth factor may act as an initiator of fibrosis. Moreover, PDGF-C transgenic mice represent a unique model for the study of hepatic fibrosis progressing to tumorigenesis. 相似文献
85.
Kuusk Teele Biancari Fausto Lane Brian Tobert Conrad Campbell Steven Rimon Uri D’Andrea Vito Mehik Aare Vaarala Markku H. 《BMC urology》2015,15(1):1-4
Epididymal anomalies and patent processus vaginalis are frequently found in boys with cryptorchidism or hydrocele. We conducted this study to evaluate the association between epididymal anomalies and testicular location or patent processus vaginalis in boys with undescended testis or hydrocele. Children undergoing surgery with undescended testis (group A, 136 boys and 162 testes) or communicating hydrocele (group B, 93 boys and 96 testes) were included. Testicular locations and epididymal anomalies were investigated prospectively. An anomalous epididymis was defined as anomalies of epididymal fusion that consisted of loss of continuity between the testis, the epididymis, and the long looping epididymis. The epididymis was considered normal when a normal, firm attachment between the testis, the caput, and the cauda epididymis was present. The mean ages of groups A and B were 24.6 ± 19.7 (range, 8–52 months) and 31.4 ± 20.6 months (range, 10–59 months). The incidence of epididymal anomalies was significantly higher in group A than that in group B (65.4 % vs. 13.5 %, P < 0.001). The incidence of epididymal anomalies in boys with undescended testis was significantly different according to testis location. Epididymal anomalies were observed in 100 %, 91.4 %, and 39.3 % of cases when the testis was located in the abdomen, inguinal canal, and distal to the external inguinal ring, respectively (P < 0.001). We conclude that epididymal anomalies were more frequent in boys with undescended testis than in boys with hydrocele, and that these anomalies were more frequent when undescended testis was at a higher level. These results suggest that testicular location is associated with epididymal anomalies rather than patent processus vaginalis. 相似文献
86.
Federico Coccolini Cristian Tranà Massimo Sartelli Fausto Catena Salomone Di Saverio Roberto Manfredi Giulia Montori Marco Ceresoli Chiara Falcone Luca Ansaloni 《World journal of gastrointestinal surgery》2015,7(8):160-169
AIM: To investigate the role of laparoscopy in diagnosis and treatment of intra abdominal infections.METHODS: A systematic review of the literature was performed including studies where intra abdominal infections were treated laparoscopically.RESULTS: Early laparoscopic approaches have become the standard surgical technique for treating acute cholecystitis. The laparoscopic appendectomy has been demonstrated to be superior to open surgery in acute appendicitis. In the event of diverticulitis, laparoscopic resections have proven to be safe and effective procedures for experienced laparoscopic surgeons and may be performed without adversely affecting morbidity and mortality rates. However laparoscopic resection has not been accepted by the medical community as the primary treatment of choice. In high-risk patients, laparoscopic approach may be used for exploration or peritoneal lavage and drainage. The successful laparoscopic repair of perforated peptic ulcers for experienced surgeons, is demonstrated to be safe and effective. Regarding small bowel perforations, comparative studies contrasting open and laparoscopic surgeries have not yet been conducted. Successful laparoscopic resections addressing iatrogenic colonic perforation have been reported despite a lack of literature-based evidence supporting such procedures. In post-operative infections, laparoscopic approaches may be useful in preventing diagnostic delay and controlling the source.CONCLUSION: Laparoscopy has a good diagnostic accuracy and enables to better identify the causative pathology; laparoscopy may be recommended for the treatment of many intra-abdominal infections. 相似文献
87.
Jonathan Araujo Queiroz Alfredo Junior Fausto Lucena Allan Kardec Barros 《Journal of electrocardiology》2018,51(2):252-259
Background
The electrocardiogram (ECG) is one of the most non-invasive techniques to give support to the atrial fibrillation (AF) diagnosis. Several authors use the temporal difference between two consecutive R waves, a method known as RR interval, to perform the AF diagnosis. However, RR interval-based analysis does not detect distortions on the other ECG waves.Purpose
Thus, the present work proposes a diagnostic decision support systems for AF based on higher order spectrum analysis of the voltage variation on the ECG..Methods
The proposed method was used aiming AF classifying. The classifier is composed by two screening stages: one based on the average and another on the average deviation of kurtosis of the ECG signals. Heartbeat obtained from the MIT-BIH atrial fibrillation and MIT-BIH normal were used.Results
ECG signal featured by kurtosis outperforms second order statistics based metrics in up to 476 times, and up to 110 times above the RR interval. The screening methods obtained sensitivity equal to 100% and specificity is up to 84.04%. The two screening methods combined provided an AF classifier with an accuracy rate at diagnosis of 100%. The results presented take into account windows of up to five heartbeats and a 99.73% confidence interval.Conclusion
The results obtained by the proposed method can be used to support decision-making in clinical practices with a diagnostic accuracy rate of 90.04% to 100%. 相似文献88.
Tanda ML Piantanida E Lai A Liparulo L Sassi L Bogazzi F Wiersinga WM Braverman LE Martino E Bartalena L 《Clinical endocrinology》2008,69(5):812-818
Objective To investigate how North American thyroidologists assess and treat amiodarone‐induced thyrotoxicosis (AIT) and to compare the results with those of the same questionnaire‐based survey previously carried out among European thyroidologists. Design Members of the American Thyroid Association (ATA) with clinical interests were sent by e‐mail a questionnaire on the diagnosis and management of AIT, 115 responses were received from the United States and Canada, representing about one‐third of ATA members with clinical interests. Results The majority of respondents (91%vs. 68% in Europe, P < 0·05) see < 10 new cases of AIT per year, and AIT seems less frequent than amiodarone‐induced hypothyroidism (AIH) in North America (34% and 66% of amiodarone‐induced thyroid dysfunction, respectively, vs. 75% and 25%, respectively, in Europe, P < 0·001). When AIT is suspected, in North America hormonal assessment is mostly based on serum free T4 (FT4) and TSH measurements, while serum free T3 (FT3) determination is requested less frequently than in Europe; thyroid autoimmunity is included in the initial assessment less than in Europe. Most commonly used additional diagnostic procedures include, as in Europe, thyroid colour‐flow Doppler sonography, and to a lesser extent, thyroid radioactive iodine uptake and scan, but Europeans tend to request multiple tests more than North Americans. Withdrawal of amiodarone is more often considered unnecessary by North American thyroidologists (21%vs. 10% in Europe in type 1 AIT, P < 0·05, 34%vs. 20% in type 2 AIT, P < 0·05). In type 1 AIT thionamides represent the treatment of choice for North Americans as well as for Europeans, but the former use them as monotherapy in 65%vs. 51% of Europeans (P < 0·05) who more often consider potassium perchlorate as an useful addition (31%vs. 15% of North Americans, P < 0·01). Glucocorticoids are the selected treatment for type 2 AIT, alone (62%vs. 46% in Europe, P < 0·05) or in association with thionamides (16%vs. 25% in Europe, P = NS). After restoration of euthyroidism, thyroid ablation in the absence of recurrent thyrotoxicosis is recommended in type 1 AIT less frequently by North Americans. If amiodarone therapy needs to be reinstituted, prophylactic thyroid ablation is advised by 76% in type 1 AIT, while a ‘wait‐and‐see’ strategy is adopted by 61% in type 2 AIT, similar to behaviour of European thyroidologists. Conclusion Similarities and differences exist between expert North American and European thyroidologists concerning the diagnosis and management of AIT. While differences reflect the frequent uncertainty of the underlying mechanism leading to AIT, similarities may represent the basis to refine the diagnostic criteria and to improve the therapeutic outcomes of this challenging clinical situation. 相似文献
89.
90.