全文获取类型
收费全文 | 1196篇 |
免费 | 79篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 107篇 |
妇产科学 | 21篇 |
基础医学 | 159篇 |
口腔科学 | 10篇 |
临床医学 | 105篇 |
内科学 | 139篇 |
皮肤病学 | 16篇 |
神经病学 | 186篇 |
特种医学 | 76篇 |
外科学 | 188篇 |
综合类 | 17篇 |
预防医学 | 118篇 |
眼科学 | 18篇 |
药学 | 67篇 |
中国医学 | 1篇 |
肿瘤学 | 50篇 |
出版年
2022年 | 5篇 |
2021年 | 9篇 |
2020年 | 8篇 |
2019年 | 11篇 |
2018年 | 14篇 |
2017年 | 14篇 |
2016年 | 14篇 |
2015年 | 21篇 |
2014年 | 22篇 |
2013年 | 32篇 |
2012年 | 48篇 |
2011年 | 38篇 |
2010年 | 40篇 |
2009年 | 37篇 |
2008年 | 80篇 |
2007年 | 77篇 |
2006年 | 74篇 |
2005年 | 68篇 |
2004年 | 81篇 |
2003年 | 59篇 |
2002年 | 50篇 |
2001年 | 34篇 |
2000年 | 21篇 |
1999年 | 19篇 |
1998年 | 26篇 |
1997年 | 22篇 |
1996年 | 18篇 |
1995年 | 13篇 |
1994年 | 17篇 |
1993年 | 16篇 |
1992年 | 38篇 |
1991年 | 23篇 |
1990年 | 33篇 |
1989年 | 21篇 |
1988年 | 20篇 |
1987年 | 14篇 |
1986年 | 10篇 |
1985年 | 17篇 |
1984年 | 15篇 |
1983年 | 9篇 |
1982年 | 12篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 5篇 |
1978年 | 8篇 |
1977年 | 12篇 |
1976年 | 8篇 |
1975年 | 10篇 |
1974年 | 3篇 |
1971年 | 2篇 |
排序方式: 共有1279条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
More children with CNS tumors will continue to be cured of their neoplasms as a result of improved surgical, radiotherapeutic, and chemotherapeutic intervention. The complex problems seen in these patients mandate their treatment at academic centers actively involved in therapeutic investigations and capable of providing comprehensive multidisciplinary care. 相似文献
5.
Roscoe Taylor Jeff Bazelmans Robert Golec Simon Oakes 《Australian and New Zealand journal of public health》1995,19(5):455-459
Abstract: To investigate the distribution of blood lead levels in a sample of Victorian children, and to compare current levels with those from a similar survey in 1979, blood was tested for lead in 252 children (123 under five years) attending Royal Children's Hospital as outpatients and having venepuncture blood samples for medical reasons. Blood lead levels were determined by graphite furnace atomic absorption spectrophotometer. The mean blood lead level was 0.26 μmol/L (5.4 μg/dL). In the under-five age group, the mean was 0.28 μmol/L (5.7 μg/dL). Only 1.6 per cent of this group exceeded the National Health and Medical Research Council action level of 0.72 μmol/L (15 μg/dL). Levels in this age group have declined significantly since 1979, when the mean was 0.54 μmol/L (11.1 μg/dL) and 12.9 per cent exceeded 0.72 μmol/L (15 μg/dL). Average blood lead levels have halved since 1979, with likely contributing factors being reduced exposure from lead in diet, reduced access to lead in paint and reduced lead in ambient air. Children with elevated levels had identifiable risk factors such as pica or exposure to lead-based paint, suggesting the need for ongoing public health action to prevent exposure in these groups. 相似文献
6.
7.
D A Kaffenberger E R Heinz J W Oakes O Boyko 《AJNR. American journal of neuroradiology》1992,13(4):1083-1088
PURPOSE: To determine whether meningocele manqué can be detected by neuroimaging techniques in dysraphic patients. METHODS: We reviewed the records and imaging studies of 16 patients with surgically proved meningocele manqué seen at our institution between 1989 and 1990. Both CT and MR imaging techniques were used. CT of the spine was performed immediately following contrast myelography. RESULTS: Nine of 16 patients (CT, four; and MR, five) showed evidence of meningocele manqué which corresponded to intraoperative findings. Fourteen of 16 patients were found to have diastematomyelia, eight with medium septum and six without a septum. Associated findings included syrinx (six), lipoma (five), dermoid cyst (one), and neuroenteric cyst (one). After completing this review, we were able to prospectively diagnose dorsal bands in two new patients; these bands were confirmed at surgery. CONCLUSION: Dorsal bands can be detected in dysraphic patients with CT or MR using operative findings as a road map. 相似文献
8.
Conventional therapy for brain tumors, consisting of neurosurgical intervention and radiotherapy, has not resulted in the successes achievable in other childhood malignancies. The role of adjuvant chemotherapy, well defined in many childhood cancers, has not yet contributed significantly to the treatment of children with brain tumors. Chemotherapy of recurrent tumors has produced regressions but no cures. The most active agents identified to date in the treatment of recurrent posterior fossa tumors include cisplatinum, cyclophosphamide and methotrexate. Future efforts will need to focus on the rational selection of drugs for study in limited agent histology-stratified phase II trials, with advancement of active agents into large randomized phase III adjuvant therapy trials. 相似文献
9.
Terry?O?Herndon Salvador?Gonzalez TR?Gowrishankar R?Rox?Anderson James?C?WeaverEmail author 《BMC medicine》2004,2(1):12
Background
Painless, rapid, controlled, minimally invasive molecular transport across human skin for drug delivery and analyte acquisition is of widespread interest. Creation of microconduits through the stratum corneum and epidermis is achieved by stochastic scissioning events localized to typically 250 μm diameter areas of human skin in vivo. 相似文献10.
Genome location of polyadenylated transcripts of herpes simplex virus type 1 and type 2 DNA. 总被引:4,自引:0,他引:4
The genome location of herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) polyadenylated RNA has been studied by hybridization of herpesvirus-specific nuclear and cytoplasmic polyadenylated RNA to the Eco R, restriction enzyme fragments of herpesvirus DNA, which have been separated by agarose gel electrophoresis and transferred to nitrocellulose paper. For both HSV-1 and HSV-2 DNA, the nuclear and the cytoplasmic polyadenylated RNA are distributed on all the Eco RI fragments of the homologous DNA. In a heterologous system, total polyadenylated RNA from HSV-1-infected cells was annealed to the Eco RI fragments of HSV-2 DNA and vice versa. HSV-2 polyadenylated RNA hybridized to all fragments of HSV-1 DNA, and HSV-1 polyadenylated RNA hybridized to all but three of the fragments of HSV-2 DNA. These data indicate that the DNA base sequence homology between the two herpesvirus strains is dispersed throughout the genome and is not located in a single contiguous block. 相似文献