全文获取类型
收费全文 | 9409篇 |
免费 | 296篇 |
国内免费 | 48篇 |
专业分类
耳鼻咽喉 | 209篇 |
儿科学 | 795篇 |
妇产科学 | 382篇 |
基础医学 | 892篇 |
口腔科学 | 224篇 |
临床医学 | 792篇 |
内科学 | 1899篇 |
皮肤病学 | 408篇 |
神经病学 | 366篇 |
特种医学 | 232篇 |
外科学 | 1515篇 |
综合类 | 316篇 |
一般理论 | 2篇 |
预防医学 | 755篇 |
眼科学 | 187篇 |
药学 | 505篇 |
1篇 | |
中国医学 | 13篇 |
肿瘤学 | 260篇 |
出版年
2017年 | 54篇 |
2016年 | 69篇 |
2015年 | 107篇 |
2014年 | 89篇 |
2013年 | 137篇 |
2012年 | 161篇 |
2011年 | 173篇 |
2010年 | 140篇 |
2009年 | 186篇 |
2008年 | 121篇 |
2007年 | 124篇 |
2006年 | 146篇 |
2005年 | 95篇 |
2004年 | 52篇 |
2003年 | 65篇 |
2002年 | 67篇 |
2001年 | 66篇 |
2000年 | 56篇 |
1999年 | 81篇 |
1998年 | 160篇 |
1997年 | 197篇 |
1996年 | 212篇 |
1995年 | 165篇 |
1994年 | 171篇 |
1993年 | 167篇 |
1992年 | 124篇 |
1991年 | 122篇 |
1990年 | 120篇 |
1989年 | 140篇 |
1988年 | 114篇 |
1987年 | 118篇 |
1986年 | 102篇 |
1985年 | 81篇 |
1984年 | 69篇 |
1983年 | 70篇 |
1982年 | 57篇 |
1981年 | 61篇 |
1980年 | 55篇 |
1979年 | 48篇 |
1977年 | 52篇 |
1976年 | 46篇 |
1959年 | 343篇 |
1958年 | 760篇 |
1957年 | 869篇 |
1956年 | 772篇 |
1955年 | 804篇 |
1954年 | 782篇 |
1953年 | 39篇 |
1949年 | 183篇 |
1948年 | 127篇 |
排序方式: 共有9753条查询结果,搜索用时 15 毫秒
1.
Margaret H. Lauerman Karen Irizarry Clint Sliker Brandon R. Bruns Ronald Tesoriero Thomas M. Scalea Deborah M. Stein 《Injury》2019,50(1):131-136
Background
Current blunt cerebrovascular injury (BCVI) grading grossly differentiates injury characteristics such as luminal stenosis (LS) and aneurysmal disease. The effect of increasing degree of LS beyond the current BCVI grading scale on stroke formation is unknown.Study Design
BCVI over a 3-year period were retrospectively reviewed. To investigate influence of LS beyond the BCVI grading scale within aneurysmal and non-aneurysmal BCVI, grade 2 BCVI were subdivided into BCVI with ≥ 25% and ≤ 50% LS and BCVI with > 50% and ≤ 99% LS. Grade 3 BCVI were subdivided into BCVI with pseudoaneurysm (PSA) without LS and BCVI with PSA and LS. We hypothesized increased LS beyond the current BCVI grade distinctions would be associated with higher rates of stroke formation.Results
312 BCVI were included, of which 140 were carotid BCVI and 172 vertebral BCVI. Sixteen carotid BCVI underwent endovascular intervention (EI) and 19 suffered a stroke. In carotid BCVI stroke rates increased sequentially with BCVI grade except in grade 3. There was a stroke rate of 12% in grade 1 carotid BCVI, 18% in grade 2, 6% in grade 3, and 31% in grade 4. In subgroup analysis for grade 2 carotid BCVI, BCVI with > 50% and ≤ 99% LS had higher rates of stroke (22% vs. 15%, p?=?0.44) than BCVI with ≥ 25% and ≤ 50% LS. In subgroup analysis of grade 3 carotid BCVI, BCVI with PSA and LS had higher rates of stroke (9% vs. 4%, p?=?0.48) than BCVI with PSA without LS. Higher rates of EI in grade 2 carotid BCVI with > 50% and ≤ 99% LS (22% vs. 5%, p?=?0.14) and grade 3 carotid BCVI with PSA and LS (35% vs. 4%, p?=?0.01) were noted in subgroup analysis.Conclusion
Higher percentage LS beyond the currently used BCVI grading scale has a non-significantly increased rate of stroke in both aneurysmal and non-aneurysmal BCVI. Grade 3 BCVI with PSA and LS seems to be a high-risk subgroup. Use of EI confounds modern measurement of stroke risk in higher LS BCVI. 相似文献2.
3.
Lei Li Jürgen Bruns Reinhard E. Friedrich Rainer Schmelzle 《European journal of plastic surgery》2006,29(2):93-96
Adamantinoma of long bones is one of the rarest of malignant bone tumors; it is commonly located in the middle or lower third of the diaphysis of the tibia. A case with multiple occurrences affecting both the tibia and fibula is presented. En bloc resection with wide operative margins was performed, and a large tibial defect of 23 cm was effectively bridged by a revascularized free fibular flap. At 13 months follow-up, there was no sign of local recurrence or metastasis, and the patient was mobile. 相似文献
4.
Restriction fragment length polymorphism of human mitochondrial DNA in a sample population from Apulia (Southern Italy) 总被引:8,自引:1,他引:7
Restriction fragment length polymorphism (RFLP) of human mitochondrial DNA was analysed in a sample of 87 subjects from Apulia (South Italy) by the restriction enzymes Hpa I, Bam HI, Hae II, Msp I, Ava II, and Hinc II using total blood cell DNA probed by human mtDNA from placenta. Five BamHI morphs were observed, two of which are new ( Bam HI-4 and -5), as well as one new Ava II morph ( Ava II-28). The association Bam HI-4/ Ava II-28 enables us to demonstrate for the first time two polymorphic Bam HI sites present together in the same mtDNA molecule. In agreement with historical data the Apulian sample has been shown to be the most heterogeneous Italian population so far tested. 相似文献
5.
GIUSEPPE PERSEO MAURO GIGLI ROBERTO DE CASTIGLIONE 《Chemical biology & drug design》1987,29(4):478-485
The synthesis of TPH-13 (Glp-Glu-Lys-Pro-Tyr-Trp-Pro-Pro-Pro-Ile-Tyr-Pro-Met-OH), a tridecapeptide isolated from the skin of the South American frog Phyllomedusa rohdei, is described and alternative approaches are discussed. 相似文献
6.
Intratemporal vascular tumors: detection with CT and MR imaging 总被引:1,自引:0,他引:1
Lo WW; Shelton C; Waluch V; Solti-Bohman LG; Carberry JN; Brackmann DE; Wade CT 《Radiology》1989,171(2):445-448
The diagnostic contributions of computed tomography (CT) and magnetic resonance (MR) imaging were compared in 12 patients with benign intratemporal vascular tumors (hemangioma or vascular malformation). The tumors included six in the internal acoustic canal and six in the geniculate ganglion region. Clinical and histologic correlations were made. Two of the six patients with tumors in the internal acoustic canal underwent CT, and both required gas cisternography to show the tumor. Five patients in that group underwent MR imaging, and all five studies showed the tumor. All six patients with geniculate ganglion tumors underwent CT. Results in one study were questionable, and five showed the tumor. Five patients in this group underwent MR imaging, but the MR findings were positive in only two cases. MR imaging should therefore be performed before CT in the evaluation of facial nerve dysfunction, as it demonstrated all tumors in the internal acoustic canal and some in the geniculate ganglion region. If MR findings are negative, CT should then be performed to rule out a possible geniculate ganglion lesion. 相似文献
7.
Dr. Stölting Dr. Bruns 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》1888,34(3):92-102
Ohne Zusammenfassung 相似文献
8.
L. TIMMER-DE MIK M.D. D.M. BROEKHUIJSEN-VAN HENTEN M.D. † J.M. OLDHOFF M.D. PH.D. D.B. DE GEER M.D. ‡ V. SIGURDSSON M.D. PH.D. S.G.M.A. PASMANS M.D. PH.D. 《Pediatric dermatology》2009,26(3):358-360
Abstract: In Sweet's syndrome, the essential features are the characteristic morphology of the lesions, their histologic appearance, the dramatic response to corticosteroids and the absence of scarring. We report an 8-month-old infant in whom Sweet's syndrome was diagnosed and who developed acquired cutis laxa in the skin lesions. 相似文献
9.
10.