全文获取类型
收费全文 | 3798篇 |
免费 | 206篇 |
国内免费 | 34篇 |
专业分类
耳鼻咽喉 | 53篇 |
儿科学 | 87篇 |
妇产科学 | 65篇 |
基础医学 | 375篇 |
口腔科学 | 118篇 |
临床医学 | 342篇 |
内科学 | 905篇 |
皮肤病学 | 47篇 |
神经病学 | 350篇 |
特种医学 | 264篇 |
外科学 | 485篇 |
综合类 | 15篇 |
一般理论 | 2篇 |
预防医学 | 160篇 |
眼科学 | 58篇 |
药学 | 261篇 |
中国医学 | 5篇 |
肿瘤学 | 446篇 |
出版年
2023年 | 28篇 |
2022年 | 52篇 |
2021年 | 98篇 |
2020年 | 73篇 |
2019年 | 71篇 |
2018年 | 71篇 |
2017年 | 69篇 |
2016年 | 89篇 |
2015年 | 102篇 |
2014年 | 103篇 |
2013年 | 166篇 |
2012年 | 235篇 |
2011年 | 229篇 |
2010年 | 136篇 |
2009年 | 131篇 |
2008年 | 212篇 |
2007年 | 234篇 |
2006年 | 227篇 |
2005年 | 245篇 |
2004年 | 240篇 |
2003年 | 228篇 |
2002年 | 180篇 |
2001年 | 42篇 |
2000年 | 24篇 |
1999年 | 27篇 |
1998年 | 62篇 |
1997年 | 73篇 |
1996年 | 60篇 |
1995年 | 56篇 |
1994年 | 64篇 |
1993年 | 38篇 |
1992年 | 27篇 |
1991年 | 19篇 |
1990年 | 13篇 |
1989年 | 35篇 |
1988年 | 30篇 |
1987年 | 29篇 |
1986年 | 28篇 |
1985年 | 30篇 |
1984年 | 23篇 |
1983年 | 12篇 |
1982年 | 23篇 |
1981年 | 17篇 |
1980年 | 19篇 |
1978年 | 9篇 |
1977年 | 9篇 |
1976年 | 6篇 |
1975年 | 8篇 |
1974年 | 4篇 |
1899年 | 2篇 |
排序方式: 共有4038条查询结果,搜索用时 0 毫秒
1.
2.
Paediatric dacryocystorhinostomy 总被引:1,自引:0,他引:1
KN Hakin FRCS FRCOphth TJ Sullivan FRACO FRACS A Sharma FCOphth † RAN Welham FRCS FCOphth † 《Clinical & experimental ophthalmology》1994,22(4):231-235
Of 258 cases of dacryocystorhinostomy performed on children in the period September 1981 to September 1991, 130 were for simple, unresolved congenital nasolacrimal duct obstruction. Other indications for surgery included punctal agenesis, lacrimal fistula, post-traumatic and post-inflammatory canalicular obstruction. Of 177 children without canalicular pathology, 171 (96%) were relieved of symptoms with one operation, without canalicular intubation. Of 81 cases with canalicular disease, 55 of 70 (79%) who underwent DCR plus canalicular intubation, and 10 of 11 who underwent DCR plus Lester-Jones tube, were substantially improved with one operation. No child required peroperative or postoperative blood transfusion. Dacryocystorhinostomy in childhood, in experienced surgical hands, is a safe procedure, achieving relief of symptoms in most cases, particularly in the absence of canalicular disease. 相似文献
3.
4.
Ernesto Pasquini Vittorio Sciarretta Giorgio Frank Cosetta Cantaroni Giovanni Carlo Modugno Diego Mazzatenta Giovanni Farneti 《Otolaryngology--head and neck surgery》2004,131(3):180-186
OBJECTIVE: The endoscopic approach can be successfully employed for the treatment of benign tumors such as fibroosseus and vascular lesions, pleomorphic adenomas, gliomas, and schwannomas. STUDY DESIGN AND SETTING: Nineteen patients diagnosed with benign tumors of the nasal cavity and paranasal sinuses and treated using an endoscopic approach were retrospectively reviewed. The endoscopic approach was used exclusively in 15 cases and was associated with an external approach in 4 cases (due to an intracranial extension of the tumor in 3 patients and its location at the level of the anterior wall of the frontal sinus in the last case). RESULTS: The resection of the lesions was radical in 18 patients and subtotal in 1 case. The mean follow-up was 27 months and only 1 recurrence (5%) was observed in the juvenile angiofibroma group 20 months postoperatively. CONCLUSION: and significance In selected cases, endoscopic surgery can be considered an effective treatment for the resection of benign tumors involving the sinonasal tract. 相似文献
5.
Jochen P?ling Wolfgang Rees Vittorio Mantovani Stephan Klaus Ludger Bahlmann Virgilius Ziaukas Norbert Hübner Henning Warnecke 《European journal of cardio-thoracic surgery》2006,30(4):597-603
BACKGROUND: For the first time, microdialysis was used to investigate in vivo and online the myocardial metabolism during and after cardiac surgery in patients treated with two different methods of myocardial protection. METHODS: Thirty patients underwent standard CABG with one of two different methods of myocardial protection. The patients were randomised to receive either cold blood (COLD group) or warm modified Calafiore cardioplegia (WARM group). Microdialysis probes were implanted into the myocardium of left ventricular apical region of the heart. Cardioplegia was given antegrade only. Microdialysis measurements were performed at time intervals before, during and 24 h after cardiopulmonary bypass and analysed for glucose, lactate, pyruvate and glycerol. RESULTS: Myocardial lactate concentrations were significantly higher in the WARM group compared with that of the COLD group, while serum lactate was comparable. Glycerol was significantly higher at the end of the clamping time in the WARM group. At the same time the glucose-lactate ratio as a marker of nutritional disorder had significantly lower levels in the WARM group. The cumulative CK-MB release over 24 h was significantly higher in those hearts protected with warm blood. CONCLUSIONS: The oxidative stress measured was significantly higher in patients undergoing CABG using modified Calafiore cardioplegia, whereas the cold cardioplegia minimised the effects of aortic clamping. The results indicate that cold cardioplegia offers superior protection of the heart, in terms of more rapid normalisation of myocardial metabolism. In elective myocardial revascularisation, intermittent antegrade warm blood cardioplegia is a comparable safe method of myocardial protection. However, in patients referring to a long clamping time, advantages of cold cardioplegia for myocardial revascularisation may be magnified. 相似文献
6.
7.
Marco Montorsi Guido Torzilli Uberto Fumagalli Stefano Bona Riccardo Rosati Matilde de Simone Vittorio Rovati Franco Mosca Carlo Filice 《HPB surgery》1994,8(2):89-94
The increased use of Ultrasonography (US) has led to increased detection of simple hepatic cysts.
For symptomatic cysts treatment is necessary. Until some years ago surgery was the only
therapy. We have treated a large number of patients with Percutaneous Alcohol Sclerotherapy
(PAS) and evaluated retrospectively the efficacy of this approach.Data on 21 patients with symptomatic simple hepatic cysts were reviewed retrospectively.
Cysts had a mean diameter of 9 cm (range: 7–15 cm). PAS was always performed under local
anesthesia and US guidance. 25% of the volume was replaced with 95% ethanol and then
completely aspirated after 20–30 minutes.No complications or deaths occurred. In all patients symptoms disappeared after treatment.
In 15 out of 21 cases there was no evidence of residual cyst on US, computed tomography (CT) or
magnetic resonance (MRI). In 6 patients with shorter follow-up, cysts showed a mean reduction
in diameter of 50%. The mean follow-up was 18 months (range 6–60 months).We conclude that PAS is easy with low risk for the patients and with good long-term results; it
should therefore become the procedure of choice for simple hepatic cysts. 相似文献
8.
Francesca Lodato Maria Rosa Tamé Marco Montagnani Vittorio Sambri Giovanna Liguori Francesco Azzaroli Paolo Costigliola Gianluca Grazi Enrico Roda Giuseppe Mazzella 《Liver transplantation》2006,12(11):1711-1714
The incidence of invasive fungal infection is increasing especially in the field of transplantation, affecting as many as 50% of bone marrow transplant (BMT) patients with neutropenia and 5-20% of solid-organ transplant (SOT) recipients. Fusarium species are soil saprophytes and plant pathogens. They may cause superficial mycoses or important opportunistic infections in patients with bone marrow suppression and neutropenia, they have been rarely described in solid organ recipients, and up to now there have been no reports of such infection in isolated liver transplanted patients. We describe a case of disseminated Fusarium solani infection with hepatic localization in a liver transplanted patient that resolved with the administration of amphotericin B. Our observation confirms that Fusarium spp. are emerging pathogens that may most frequently affect not only BMT patients and patients with hematological malignancies, but also SOT patients. They may cause both localized and disseminated infection. In conclusion, Fusarium spp. etiology should be considered in the context of infectious diseases following liver transplantation. 相似文献
9.
10.
Vittorio Petraccone Finizia Auriemma Francesco Dal Poggetto Claudio De Rosa Gaetano Guerra Paolo Corradini 《Macromolecular chemistry and physics.》1993,194(5):1335-1345
In this contribution, the X-ray diffraction (XRD) pattern of a highly oriented sample of syndiotactic polystyrene in the mesomorphic form, collected by an automatic diffractometer, is presented, thus providing quantitative and more complete information relative to the diffracted intensity. The structural changes induced by annealing procedures in mesomorphic samples are shown through the analysis of the XRD patterns: both unoriented and oriented mesomorphic samples are transformed gradually into α-form crystals. On the basis of these evidences and of preliminary comparisons between the calculated Fourier transform of simplified models and the experimental diffraction intensity, it is suggested that the local organization in triplets of trans-planar chains, typical of the different modifications of the α-form, would be largely present also in the disordered chain agglomerates of the mesomorphic form. 相似文献