全文获取类型
收费全文 | 9305篇 |
免费 | 435篇 |
国内免费 | 41篇 |
专业分类
耳鼻咽喉 | 214篇 |
儿科学 | 790篇 |
妇产科学 | 392篇 |
基础医学 | 886篇 |
口腔科学 | 255篇 |
临床医学 | 876篇 |
内科学 | 1827篇 |
皮肤病学 | 409篇 |
神经病学 | 434篇 |
特种医学 | 221篇 |
外科学 | 1387篇 |
综合类 | 356篇 |
一般理论 | 3篇 |
预防医学 | 868篇 |
眼科学 | 188篇 |
药学 | 473篇 |
1篇 | |
中国医学 | 13篇 |
肿瘤学 | 188篇 |
出版年
2017年 | 58篇 |
2016年 | 52篇 |
2015年 | 76篇 |
2014年 | 79篇 |
2013年 | 126篇 |
2012年 | 172篇 |
2011年 | 171篇 |
2010年 | 143篇 |
2009年 | 182篇 |
2008年 | 130篇 |
2007年 | 136篇 |
2006年 | 145篇 |
2005年 | 102篇 |
2004年 | 50篇 |
2003年 | 62篇 |
2002年 | 54篇 |
2001年 | 68篇 |
2000年 | 57篇 |
1999年 | 99篇 |
1998年 | 166篇 |
1997年 | 192篇 |
1996年 | 210篇 |
1995年 | 171篇 |
1994年 | 173篇 |
1993年 | 164篇 |
1992年 | 122篇 |
1991年 | 129篇 |
1990年 | 125篇 |
1989年 | 139篇 |
1988年 | 113篇 |
1987年 | 126篇 |
1986年 | 105篇 |
1985年 | 75篇 |
1984年 | 78篇 |
1983年 | 67篇 |
1982年 | 63篇 |
1981年 | 71篇 |
1980年 | 57篇 |
1979年 | 54篇 |
1978年 | 47篇 |
1977年 | 57篇 |
1976年 | 48篇 |
1959年 | 347篇 |
1958年 | 759篇 |
1957年 | 868篇 |
1956年 | 776篇 |
1955年 | 804篇 |
1954年 | 781篇 |
1949年 | 182篇 |
1948年 | 125篇 |
排序方式: 共有9781条查询结果,搜索用时 15 毫秒
1.
2.
3.
Paul Steinbok Ken Poskitt D. Douglas Cochrane O. Olof Flodmark 《Child's nervous system》1991,7(1):16-20
Enhanced and non-enhanced computed tomography (CT) brain scans were performed within 72 h of surgery on 21 children in whom brain tumors had been resected totally or subtotally, and scans were repeated at varying intervals thereafter. Biopsies of the resection margins were performed in 12 patients at the end of the surgical procedure. The immediate CT scan showed enhancement in the resection margin in 13 of the 21 patients and in 9 of the 13, the enhancement disappeared on follow-up scans. There was discordance between the results of immediate CT scan examination and the biopsies of the resection margins in 7 of the 12 cases. The advantages and disadvantages of an immediate postoperative scan versus a more delayed CT scan are discussed. 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.
D D Cochrane K J Poskitt M G Norman 《The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques》1991,18(2):181-195
Cerebral dysgenesis encompasses varied disorders of brain development. Based on the understanding of these conditions provided by histopathologists, embryologists, radiologists and developmental pediatricians, surgeons are able to appropriately assist in the care of these patients. The surgeon can offer assessment of the ventriculomegaly that commonly accompanies cerebral dysgenesis in addition to providing methods to control hydrocephalus, to reconstruct cranial and facial malformations and to remove dysfunctional tissue. For most patients, surgical intervention is only one of the many factors that determine developmental prognosis. Based on the foundation built by other specialists, this review discusses cerebral dysgenesis from the perspective of historical and current surgical interventions. 相似文献
7.
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
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.