全文获取类型
收费全文 | 733篇 |
免费 | 55篇 |
专业分类
耳鼻咽喉 | 29篇 |
儿科学 | 20篇 |
妇产科学 | 3篇 |
基础医学 | 63篇 |
口腔科学 | 1篇 |
临床医学 | 74篇 |
内科学 | 96篇 |
皮肤病学 | 29篇 |
神经病学 | 70篇 |
特种医学 | 79篇 |
外科学 | 200篇 |
综合类 | 12篇 |
预防医学 | 15篇 |
眼科学 | 7篇 |
药学 | 54篇 |
肿瘤学 | 36篇 |
出版年
2023年 | 6篇 |
2022年 | 6篇 |
2021年 | 18篇 |
2020年 | 8篇 |
2019年 | 13篇 |
2018年 | 21篇 |
2017年 | 8篇 |
2016年 | 19篇 |
2015年 | 34篇 |
2014年 | 28篇 |
2013年 | 27篇 |
2012年 | 40篇 |
2011年 | 46篇 |
2010年 | 21篇 |
2009年 | 27篇 |
2008年 | 43篇 |
2007年 | 47篇 |
2006年 | 50篇 |
2005年 | 49篇 |
2004年 | 52篇 |
2003年 | 44篇 |
2002年 | 30篇 |
2001年 | 9篇 |
2000年 | 13篇 |
1999年 | 12篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1996年 | 7篇 |
1995年 | 4篇 |
1994年 | 9篇 |
1993年 | 3篇 |
1992年 | 10篇 |
1991年 | 10篇 |
1990年 | 7篇 |
1989年 | 4篇 |
1987年 | 2篇 |
1984年 | 2篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 5篇 |
1979年 | 9篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1972年 | 2篇 |
1970年 | 3篇 |
1940年 | 2篇 |
1937年 | 1篇 |
1936年 | 1篇 |
1908年 | 1篇 |
排序方式: 共有788条查询结果,搜索用时 15 毫秒
61.
62.
Kremser C Trieb T Rudisch A Judmaier W de Vries A 《Journal of magnetic resonance imaging : JMRI》2007,26(3):662-671
PURPOSE: To describe details about the implementation of a dynamic T(1)-mapping technique and a simple data analysis strategy that can be used to predict therapy outcome in primary rectal carcinoma and to investigate the physiologic meaning of the obtained parameter. MATERIALS AND METHODS: Contrast-enhanced dynamic T(1) mapping was achieved with a snapshot fast low-angle shot (FLASH) T(1) mapping sequence implemented on a 1.5 T MR scanner. This method was applied to 58 patients with primary rectal cancer before onset of chemoradiation therapy. A simple data analysis strategy based on the calculation of the maximum slope of the tissue concentration-time curve divided by the maximum of the arterial input function (AIF) was used as a measure of tumor microcirculation (PI values). RESULTS: The snapshot FLASH (SFL) T(1)-mapping technique is accurate and sensitive enough to detect inhomogeneous uptake kinetics within tumor tissue. Classifying the patients into two groups according to therapy response showed lower mean PI values for responders as compared to nonresponders. PI was found to combine information about permeability surface area product (PS) and blood volume. CONCLUSIONS: The described method based on dynamic T(1) mapping has the potential to be a clinical tool for predicting therapy outcome of preoperative chemoradiation in patients with primary rectal carcinoma. 相似文献
63.
Gertraut Altreuther Annette Schimmel Iris Schroeder Thomas Bach Samuel Charles Dawid J. Kok Friederike Kraemer Sonja Wolken David Young Klemens J. Krieger 《Parasitology research》2009,105(Z1):1-8
The efficacy of emodepside plus praziquantel tablets (Profender? tablets for dogs) against mature adult, immature adult and
larval stages of Toxocara canis and Toxascaris leonina was evaluated in ten randomised, blinded and placebo-controlled dose confirmation studies in naturally or experimentally
infected dogs. The tablets were used at the proposed minimum dose of 1 mg emodepside and 5 mg praziquantel per kg body weight.
Efficacy was calculated based on worm counts after necropsy. Five studies demonstrated >99% efficacy against mature adult,
>92% efficacy against immature adult, >98% efficacy against L4 and >94% efficacy against L3 larval stages of T. canis. Another five studies demonstrated >99% efficacy against mature and immature adult and >95% efficacy against L4 larval stages
of T. leonina. No side effects of the treatment were observed. Emodepside plus praziquantel tablets thus provide a comprehensive new treatment
option for ascarid infections in the dog. 相似文献
64.
65.
Arne Sattler Eva Schrezenmeier Ulrike A. Weber Alexander Potekhin Friederike Bachmann Henriette Straub-Hohenbleicher Klemens Budde Elena Storz Vanessa Proß Yasmin Bergmann Linda M.L. Thole Caroline Tizian Oliver Hlsken Andreas Diefenbach Hubert Schrezenmeier Bernd Jahrsdrfer Tomasz Zemojtel Katharina Jechow Christian Conrad Sren Lukassen Diana Stauch Nils Lachmann Mira Choi Fabian Halleck Katja Kotsch 《The Journal of clinical investigation》2021,131(14)
Novel mRNA-based vaccines have been proven to be powerful tools in combating the global pandemic caused by SARS-CoV-2, with BNT162b2 (trade name: Comirnaty) efficiently protecting individuals from COVID-19 across a broad age range. Still, it remains largely unknown how renal insufficiency and immunosuppressive medication affect development of vaccine-induced immunity. We therefore comprehensively analyzed humoral and cellular responses in kidney transplant recipients after the standard second vaccination dose. As opposed to all healthy vaccinees and the majority of hemodialysis patients, only 4 of 39 and 1 of 39 transplanted individuals showed IgA and IgG seroconversion at day 8 ± 1 after booster immunization, with minor changes until day 23 ± 5, respectively. Although most transplanted patients mounted spike-specific T helper cell responses, frequencies were significantly reduced compared with those in controls and dialysis patients and this was accompanied by a broad impairment in effector cytokine production, memory differentiation, and activation-related signatures. Spike-specific CD8+ T cell responses were less abundant than their CD4+ counterparts in healthy controls and hemodialysis patients and almost undetectable in transplant patients. Promotion of anti-HLA antibodies or acute rejection was not detected after vaccination. In summary, our data strongly suggest revised vaccination approaches in immunosuppressed patients, including individual immune monitoring for protection of this vulnerable group at risk of developing severe COVID-19. 相似文献
66.
Trieb K 《The Journal of hand surgery》2008,33(1):113-123
Wrist involvement is common in rheumatoid arthritis and affects up to 50% of patients within the first 2 years after the onset of the disease, including bilateral involvement. It is a progressive disease that destroys the articular cartilage and surrounding soft tissues, thus leading to severe deformities. Radiological changes are characteristic and include narrowing of the joint line, cysts, and periarticular osteoporosis. Clinical changes are characterized by different scoring systems, indicating different therapeutic options. Surgical orthopedic treatment options include joint-preserving techniques to prevent further damage (radiosynoviorthesis, synovectomy, or axial correction with tendon transfers in earlier stages) and joint replacing techniques to restore function (arthrodesis, resection arthroplasty or total joint arthroplasty in later stages). This article reviews pathologic changes in the rheumatoid hand and their surgical treatment alternatives. 相似文献
67.
Giessing M Fuller TF Tuellmann M Slowinski T Budde K Liefeldt L 《World journal of urology》2007,25(3):325-332
Owing to the increasing disparity of organ demand and organ supply the search for optimal immunosuppressive strategies has
become a central issue in kidney transplantation (KTX). In the focus today are modifications of the use of calcineurin-inhibitors
(CNIs, Cyclosporine A/Tacrolimus) and steroids, as they are nephrotoxic and promote cardiovascular risk factors like arterial
hypertension, hyperlipidemia and diabetes mellitus. These modifications can either be withdrawal or avoidance of these substances
in combination with new and/or established immunosuppressants. Because about half of all KTXs are performed by or with the
help of urologists’ knowledge of modern immunosuppressive regimens is crucial also for urologists. We performed a literature
research (PubMed, DIMDI, medline) for CNI- and steroid-sparing protocols and studies to elucidate their influence on graft-function
and graft- and patient-survival. New substances and actual studies were also evaluated. Several published reports on CNI-
and steroid-sparing protocols after KTX exist, including withdrawal, reduction or avoidance. The time of reduction seems to
be crucial: an initially increased immune response should be counterbalanced by an initially intensified immunosuppression.
Therefore, late steroid withdrawal seems to be safer than early withdrawal especially in Cyclosporine-based immunosuppression.
Steroid avoidance also seems feasible on a CNI based regimen, especially in context with induction therapy. Withdrawal or
avoidance of CNIs seems feasible with mycophenolate acid and/or induction therapy with IL 2-receptor antibodies as co-immunosuppressants.
This is of interest in grafts with deteriorating function or from donors with extended criteria. Also, CNI- and steroid-free
immunosuppression can be successfully performed with new immunosuppressants but results are yet premature. CNI- and/or steroid
reduction, withdrawal or even avoidance is feasible. As long-term graft function is the goal of KTX and as more kidneys from
donors with extended criteria are transplanted “tailored immunosuppression” will replace standards in the future. 相似文献
68.
Klemens Rappersberger 《Der Hautarzt; Zeitschrift für Dermatologie, Venerologie, und verwandte Gebiete》1999,50(10):706-714
Zusammenfassung Infektionen mit Herpes-simplex-Virus Typ I und Typ II (HSV) und Varicella/Zoster-Viren (VZV) w?hren ein Leben lang. Klinische Manifestationen werden durch den Lebenszyklus der Viren – Prim?rinfektion-Latenzphase-endogene Reaktivierung – bestimmt. Prim?rinfektionen mit HSV und VZV führen w?hrend der Schwangerschaft oft zu schwersten, auch t?dlichen Erkrankungen. Insbesondere in der ersten H?lfte der Schwangerschaft sind solche Infektionen mit einer Gefahr für den F?ten verbunden: als Folge einer f?talen Infektion kommt es zu einer erh?hten Rate von Spontanaborten, Totgeburten und von f?talen Mi?bildungen; das „f?tale Varizellensyndrom” stellt dabei eine gut definierte Entit?t dar. In der Peripartalphase stellen sowohl Varizellen aber auch ein Herpes genitalis (auch Rezidive) im Geburtskanal potentielle Infektionsquellen dar, welche zu lebensbedrohlichen Erkrankungen des Neugeborenen führen k?nnen. In dieser Arbeit werden die unterschiedlichen Phasen des Lebenszyklus von HSV/VZV dargestellt und die Besonderheiten dieser Infektionkrankheiten in der Schwangerschaft aufgezeigt. Besonders hervorgehoben wird Epidemiologie und klinisches Bild der Erkrankungen des F?ten und Neugeborenen, und schlie?lich werden deren Prophylaxe und Therapie besprochen. Eingegangen am 15. Dezember 1998 Angenommen am 3. Februar 1999 相似文献
69.
70.