全文获取类型
收费全文 | 753篇 |
免费 | 39篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 12篇 |
妇产科学 | 9篇 |
基础医学 | 68篇 |
口腔科学 | 14篇 |
临床医学 | 59篇 |
内科学 | 161篇 |
皮肤病学 | 10篇 |
神经病学 | 86篇 |
特种医学 | 12篇 |
外科学 | 179篇 |
综合类 | 5篇 |
预防医学 | 70篇 |
眼科学 | 7篇 |
药学 | 36篇 |
中国医学 | 5篇 |
肿瘤学 | 55篇 |
出版年
2023年 | 15篇 |
2022年 | 16篇 |
2021年 | 41篇 |
2020年 | 26篇 |
2019年 | 33篇 |
2018年 | 21篇 |
2017年 | 8篇 |
2016年 | 17篇 |
2015年 | 36篇 |
2014年 | 40篇 |
2013年 | 53篇 |
2012年 | 65篇 |
2011年 | 75篇 |
2010年 | 41篇 |
2009年 | 25篇 |
2008年 | 34篇 |
2007年 | 41篇 |
2006年 | 37篇 |
2005年 | 51篇 |
2004年 | 27篇 |
2003年 | 23篇 |
2002年 | 24篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 4篇 |
1995年 | 1篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1985年 | 3篇 |
1983年 | 3篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有792条查询结果,搜索用时 218 毫秒
111.
Michiel A. IJsseldijk Melina Shoni Charles Siegert Bastiaan Wiering K.C. Anton van Engelenburg Abraham Lebenthal Richard P.G. ten Broek 《Journal of thoracic oncology》2019,14(4):583-595
Introduction
Stereotactic body radiation therapy (SBRT) is a promising curative treatment for early-stage NSCLC. It is unclear if survival outcomes for SBRT are influenced by a lack of pathological confirmation of malignancy and staging of disease in these patients. In this systematic review and meta-analysis, we assess survival outcomes after SBRT in studies with patients with clinically diagnosed versus biopsy-proven early-stage NSCLC.Methods
The main databases were searched for trials and cohort studies without restrictions to publication status or language. Two independent researchers performed the screening and selection of eligible studies. Outcomes were overall survival, cancer-specific survival, and disease-free survival. The inverse variance method and the random effects method for meta-analysis were used to assess pooled survival estimates.Results
A total of 11,195 nonduplicate records were identified by the original search strategy. After screening by title and abstract, 1051 potentially eligible records were identified. A total of 43 articles were included. The comparative studies showed lower 3-year overall survival and lower 2-year and 5-year cancer-specific survival for biopsy-proven disease compared to clinical disease. However, 5-year overall survival was the same for both groups. For the pooled estimates, 3-year disease-free survival and 2-year cancer-specific survival were lower for biopsied disease.Conclusions
Results of this systematic review and meta-analysis show a discrepancy in oncological outcomes for patients undergoing SBRT for suspected early-stage NSCLC in whom there is pathologic conformation of malignancy and those who there is only a clinical diagnose of NSCLC. These results emphasize the importance of obtaining pathologic proof of malignancy. 相似文献112.
Melina A. Malli Rachel Forrester-Jones Glynis Murphy 《European child & adolescent psychiatry》2016,25(2):127-139
Tourette’s syndrome (TS) is a childhood onset neurodevelopmental disorder, characterised by tics. To our knowledge, no systematic reviews exist which focus on examining the body of literature on stigma in association with children and adolescents with TS. The aim of the article is to provide a review of the existing research on (1) social stigma in relation to children and adolescents with TS, (2) self-stigma and (3) courtesy stigma in family members of youth with TS. Three electronic databases were searched: PsycINFO, PubMed and Web of Science. Seventeen empirical studies met the inclusion criteria. In relation to social stigma in rating their own beliefs and behavioural intentions, youth who did not have TS showed an unfavourable attitude towards individuals with TS in comparison to typically developing peers. Meanwhile, in their own narratives about their lives, young people with TS themselves described some form of devaluation from others as a response to their disorder. Self-degrading comments were denoted in a number of studies in which the children pointed out stereotypical views that they had adopted about themselves. Finally, as regards courtesy stigma, parents expressed guilt in relation to their children’s condition and social alienation as a result of the disorder. Surprisingly, however, there is not one study that focuses primarily on stigma in relation to TS and further studies that examine the subject from the perspective of both the ‘stigmatiser’ and the recipient of stigma are warranted. 相似文献
113.
Anastasia Antoniou Anastasia Nikolaou Nikolas Evripidou Andreas Georgiou Antria Filippou Vasiliki Zinonos Marinos Giannakou Antreas Chrysanthou Cleanthis Ioannides Christakis Damianou 《The international journal of medical robotics + computer assisted surgery : MRCAS》2023,19(5):e2526
Background
The current study proposes simple methods for assessing the performance of robotic devices intended for Magnetic Resonance Imaging (MRI)-guided needle biopsy.Methods
In-house made agar-based breast phantoms containing biopsy targets served as the main tool in the evaluation process of an MRI compatible positioning device comprising a needle navigator. The motion accuracy of mechanical stages was assessed by calliper measurements. Laboratory evaluation of needle targeting included a repeatability phantom test and a laser-based method. The accuracy and repeatability of needle targeting was also assessed by MRI.Results
The maximum error of linear motion for steps up to 10 mm was 0.1 mm. Needle navigation relative to the phantom and alignment with the various biopsy targets were performed successfully in both the laboratory and MRI settings. The proposed biopsy phantoms offered tissue-like signal in MRI and good haptic feedback during needle insertion.Conclusions
The proposed methods could be valuable in the process of validating the accuracy of MRI-guided biopsy robotic devices in both laboratory and real environments. 相似文献114.
Gilda Porta Elisa de Carvalho Jorge L. Santos Jorge Gama Cristian V. Borges Renata B.P.M. Seixas Alexandre R. Ferreira Irene K. Miura Themis R. Silveira Luciana R. Silva Eleonora D.T. Fagundes Maria A. Bellomo-Brandao Regina Sawamura Sandra M. Vieira Melina U. Melere Cibele D.F. Marques Renata P. Pugliese Vera L. Danesi Gabriel Hessel 《Jornal de pediatria》2019,95(4):419-427
ObjectiveThis large study with a long-term follow-up aimed to evaluate the clinical presentation, laboratory findings, histological profile, treatments, and outcomes of children and adolescents with autoimmune hepatitis.MethodsThe medical records of 828 children and adolescents with autoimmune hepatitis were reviewed. A questionnaire was used to collect anonymous data on clinical presentation, biochemical and histological findings, and treatments.ResultsOf all patients, 89.6% had autoimmune hepatitis-1 and 10.4% had autoimmune hepatitis-2. The female sex was predominant in both groups. The median age at symptom onset was 111.5 (6; 210) and 53.5 (8; 165) months in the patients with autoimmune hepatitis 1 and autoimmune hepatitis-2, respectively. Acute clinical onset was observed in 56.1% and 58.8% and insidious symptoms in 43.9% and 41.2% of the patients with autoimmune hepatitis-1 and autoimmune hepatitis-2, respectively. The risk of hepatic failure was 1.6-fold higher for autoimmune hepatitis-2. Fulminant hepatic failure occurred in 3.6% and 10.6% of the patients with autoimmune hepatitis-1 and autoimmune hepatitis-2, respectively; the risk was 3.1-fold higher for autoimmune hepatitis-2. The gamma globulin and immunoglobulin G levels were significantly higher in autoimmune hepatitis-1, while the immunoglobulin A and C3 levels were lower in autoimmune hepatitis-2. Cirrhosis was observed in 22.4% of the patients; biochemical remission was achieved in 76.2%. The actuarial survival rate was 93.0%. A total of 4.6% underwent liver transplantation, and 6.9% died (autoimmune hepatitis-1: 7.5%; autoimmune hepatitis-2: 2.4%).ConclusionsIn this large clinical series of Brazilian children and adolescents, autoimmune hepatitis-1 was more frequent, and patients with autoimmune hepatitis-2 exhibited higher disease remission rates with earlier response to treatment. Patients with autoimmune hepatitis-1 had a higher risk of death. 相似文献
115.
A positive-feedback mechanism promotes reovirus particle conversion to the intermediate associated with membrane penetration
下载免费PDF全文
![点击此处可从《Proceedings of the National Academy of Sciences of the United States of America》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Agosto MA Myers KS Ivanovic T Nibert ML 《Proceedings of the National Academy of Sciences of the United States of America》2008,105(30):10571-10576
Membrane penetration by reovirus is associated with conversion of a metastable intermediate, the ISVP, to a further-disassembled particle, the ISVP*. Factors that promote this conversion in cells are poorly understood. Here, we report the in vitro characterization of a positive-feedback mechanism for promoting ISVP* conversion. At high particle concentration, conversion approximated second-order kinetics, and products of the reaction operated in trans to promote the conversion of target ISVPs. Pore-forming peptide μ1N, which is released from particles during conversion, was sufficient for promoting activity. A mutant that does not undergo μ1N release failed to exhibit second-order conversion kinetics and also failed to promote conversion of wild-type target ISVPs. Susceptibility of target ISVPs to promotion in trans was temperature dependent and correlated with target stability, suggesting that capsid dynamics are required to expose the interacting epitope. A positive-feedback mechanism of promoting escape from the metastable intermediate has not been reported for other viruses but represents a generalizable device for sensing a confined volume, such as that encountered during cell entry. 相似文献
116.
117.
Franziska Tanneberger Ahmed Abd El Wahed Melina Fischer Sandra Blome Uwe Truyen 《Viruses》2021,13(11)
African swine fever (ASF) has become a global threat to the pig industry and wild suids. Within Europe, including Germany, affected wild boar populations play a major role. Fencing and carcass removal in combination with the reduction in environmental contamination are key to control further spread. The handling of the ASF virus (ASFV) is restricted to high-containment conditions in Germany. According to the regulation of the German Veterinarian Society (DVG), modified vaccinia Ankara virus (MVAV) is the virus of choice to determine the efficacy of disinfection for enveloped viruses. The aim of this study was to use the MVAV as a guide to select the best possible disinfectant solution and concentration for the inactivation of ASFV in soil. Both viruses were tested simultaneously. In this study, two layers (top and mineral soil) of soil types from six different locations in Saxony, Germany, were collected. The tenacity of ASFV and MVAV were tested at various time points (0.5 to 72 h). The capabilities of different concentrations of peracetic acid and citric acid (approx. 0.1 to 2%) to inactivate the viruses in the selected soil types with spiked high protein load were examined under appropriate containment conditions. Around 2–3 Log10 (TCID50) levels of reduction in the infectivity of both ASFV and MVAV were observed in all soil types starting after two hours. For MVAV, a 4 Log10 loss was recorded after 72 h. A total of 0.1% of peracetic acid (5 L/m2) was sufficient to inactivate the viruses. A 4 log10 reduction in the infectivity of MVAV was noticed by applying 1% citric acid, while a 2 log10 decline was recorded with ASFV. In conclusion, comparing MVAV to ASFV for efficacy screening of disinfectant solutions has revealed many similarities. Peracetic acid reduced the infectivity of both viruses independently of the soil type and the existence of a high organic soiling. 相似文献
118.
119.
120.
Alberto R. M. Martinez Melina P. Martins Carlos R. Martins Ingrid Faber Thiago J. R. de Rezende Anamarli Nucci Marcondes C. Frana 《Journal of the peripheral nervous system : JPNS》2019,24(3):242-246
Sensory neuronopathies (SN) result from dorsal root ganglia damage and manifest with a combination of sensory deficits and proprioceptive ataxia. Characterization of the natural history and development of therapeutic trials are hampered by the lack of clinical scales that capture the whole spectrum of SN‐related manifestations. We propose and validate a rating instrument for SN. Three experienced neuromuscular specialists developed items to rate SN. The resultant instrument was later validated by the assessment of the intra‐class correlation coefficient, for inter‐rater validity in 48 SN patients, and later in a smaller subset of 16 patients to assess its intra‐rater validity. Standardized Crombach's alpha and Oblimin rotation analysis were performed to verify internal consistency and items' relationship, respectively. Evaluation of Sensory Ataxia Rating Scale (SEARS)'s external validity was performed by comparison to: scale for the assessment and rating of ataxia (SARA), Beck balance scale (BBS), and INCAT sensory sum score (ISS). A 10‐item scale with an intra‐class correlation coefficient >0.95 for intra‐ and inter‐rating measurements with a good internal consistency (standardized Cronbach's alpha of 0.83) were observed. There was a normal distribution of the scores without a floor or ceiling effect. A moderate to good correlation between SEARS and SARA, BBS, and ISS was observed. SEARS is a reliable, easy‐to‐perform and consistent instrument to rate SN. Larger cohorts and multicenter studies are needed to validate its usefulness towards possible treatment trials. 相似文献