全文获取类型
收费全文 | 174319篇 |
免费 | 910篇 |
专业分类
耳鼻咽喉 | 1124篇 |
儿科学 | 6605篇 |
妇产科学 | 2989篇 |
基础医学 | 16367篇 |
口腔科学 | 1532篇 |
临床医学 | 12250篇 |
内科学 | 30513篇 |
皮肤病学 | 654篇 |
神经病学 | 16346篇 |
特种医学 | 8883篇 |
外科学 | 28653篇 |
综合类 | 2306篇 |
预防医学 | 18018篇 |
眼科学 | 2720篇 |
药学 | 9376篇 |
中国医学 | 623篇 |
肿瘤学 | 16270篇 |
出版年
2019年 | 15篇 |
2018年 | 21921篇 |
2017年 | 17360篇 |
2016年 | 19502篇 |
2015年 | 881篇 |
2014年 | 766篇 |
2013年 | 722篇 |
2012年 | 6876篇 |
2011年 | 20922篇 |
2010年 | 18759篇 |
2009年 | 11467篇 |
2008年 | 19417篇 |
2007年 | 21608篇 |
2006年 | 450篇 |
2005年 | 2080篇 |
2004年 | 3290篇 |
2003年 | 4262篇 |
2002年 | 2414篇 |
2001年 | 252篇 |
2000年 | 395篇 |
1999年 | 150篇 |
1998年 | 190篇 |
1997年 | 195篇 |
1996年 | 84篇 |
1995年 | 95篇 |
1994年 | 93篇 |
1993年 | 55篇 |
1992年 | 35篇 |
1991年 | 82篇 |
1990年 | 120篇 |
1989年 | 73篇 |
1988年 | 50篇 |
1987年 | 37篇 |
1986年 | 21篇 |
1985年 | 28篇 |
1984年 | 18篇 |
1983年 | 20篇 |
1982年 | 24篇 |
1980年 | 39篇 |
1974年 | 19篇 |
1970年 | 19篇 |
1969年 | 20篇 |
1968年 | 17篇 |
1939年 | 20篇 |
1938年 | 60篇 |
1937年 | 25篇 |
1935年 | 22篇 |
1934年 | 30篇 |
1932年 | 56篇 |
1930年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
Kyu-Won Shim Tae-Gon Kim Chang-Ok Suh Jae-Ho Cho Chul-Joo Yoo Joong-Uhn Choi Jung-Hee Kim Dong-Seok Kim 《Child's nervous system》2007,23(10):1155-1161
Object A radiation dose of 40–50 Gy is able to produce a cure rate of more than 90% in intracranial pure germinoma. However, many
attempts have been made to reduce the dose and volume of radiation without compromising the disease control rate because of
the toxicity of irradiation. This retrospective study is intended to provide the physician with an appropriate therapeutic
strategy.
Materials and methods We reviewed a series of 10 recurrent germinomas among 117 germinomas diagnosed histologically or clinically between 1979 and
2002. These patients involved underwent three different treatment modalities; radiation alone (N = 71), chemotherapy alone (N = 9), and combined therapy (N = 37). The 10-year overall and relapse-free survival rates were 97 and 93% in the radiation alone group, 89 and 67% in the
chemotherapy alone group, and 92 and 92% in the combined therapy group, respectively. As expected, both radiation therapy
and combined therapy were effective in controlling the disease. Tumor recurrence was closely related to the volume of radiation
but not to the dose of radiation. If the tumor bed and craniospinal axis were fully covered, the radiation dose might be reduced.
Chemotherapy alone showed earlier recurrence and a higher tumor recurrence rate. In the case of combined therapy, chemotherapy
was useful in reducing the radiation dose but revealed some toxicity (death of two patients).
Conclusions The investigation of a possible further dose reduction seems worthwhile. Radiation therapy alone with a dose of less than
40 Gy should be compared with ongoing chemotherapeutic protocols combined with low-dose irradiation. 相似文献
132.
Yi-Hwa Liu 《Journal of nuclear cardiology》2007,14(4):483-491
Conclusion Quantification of nuclear cardiac images provides a secondary support in reading myocardial perfusion images and improves
the reproducibility in the diagnosis of cardiovascular diseases. The technology for the remote Web reading of nuclear cardiac
images and the quantitative data allows for an easy and secured access to patient studies without the limitations of time
and space. The recent increasing interests and applications in molecular targeted imaging have opened a new field in nuclear
cardiology, and absolute image quantification of the focal tracer uptake in the myocardium is exceedingly critical for the
quantitative analysis of molecular targeted images. 相似文献
133.
CASE REPORT: A 12-year-old boy who had a history of Kawasaki disease 9 years ago experienced a subarachnoid hemorrhage by ruptured right posterior cerebral artery aneurysm. On day 1 operation, as the aneurysm was very fragile and bled easily, two intraoperative ruptures, including a very premature rupture, were encountered. As a result, a left hemiparesis especially severe in the left hand was caused by the right anterior thalamic infarction due to the occlusion of a thalamo-perforating artery arising near the neck of the aneurysm. DISCUSSION: The histopathological examination of the intraoperative excised aneurysmal dome disclosed the thickening of the endothelial inner due to the endothelial hypertrophy and the invasion of inflammatory cells. This finding of the aneurysm was partially mimicking the finding of the coronary artery of the patients with Kawasaki disease. The combination of cerebral aneurysm and Kawasaki disease has never been reported until now, and the etiology of the aneurysm of this patient is unclear. 相似文献
134.
Akira Ishih Toshio Miyase Tohru Suzuki Francis W. Muregi Mamoru Terada 《Journal of natural medicines》2007,61(2):213-216
Febrifugine and isofebrifugine alkaloid mixtures extracted from the leaves and buds of Hydrangea macrophylla var. Otaksa, collected during different months, in Japan, were quantified using high-performance liquid chromatography. Leaves collected
during the flowering season, namely from June to August, contained 0.16–0.31 mg/g of the alkaloid mixture, whereas those collected
from September to December had less than 0.03 mg/g of the mixture. However, extracts of buds harvested from October to February
contained a consistently larger amount (more than 0.49 mg/g) of the alkaloids. Hot-water extracts from the leaves and buds
collected during different seasons were evaluated for antimalarial activity against Plasmodium yoelii 17XL in mice. The extract of leaves collected in August demonstrated high antimalarial activity, and all mice that received
the extract survived the infection. In contrast, the extract of leaves collected in December showed little activity. The extract
of buds collected in December cleared parasites, but with subsequent mortality to mouse. The present results show that the
amount of antimalarial agent—febrifugine and isofebrifugine mixture—in H. macrophylla var. Otaksa is both part- and season-dependent, suggesting that the choice of plant parts and their harvesting season are important factors
worth considering in the pharmacological use of medicinal plants. 相似文献
135.
Background
The telomeric region of mouse chromosome 12 has previously shown frequent allelic loss in murine lymphoma. The Bcl11b gene has been identified and suggested as a candidate tumor suppressor gene within this region. In this study, we aimed to elucidate whether Bcl11b is mutated in lymphomas with allelic loss, and whether the mutations we detected conferred any effect on cell proliferation and apoptosis. 相似文献136.
137.
Daniela Klitscher Lars P. Müller Pol Rommens 《European journal of trauma and emergency surgery》2007,33(1):69-73
Abstract 10 embalmed cadaver forearms and wrists were dissected to determine the anatomical course of the superficial branch of the
radial nerve in the distal forearm. The superficial radial nerve bifurcated in two branches at a mean of 54,7 mm proximal
to the radial styloid. From the styloid process of the radius, the mean distance to the closest dorsal branch of the superficial
radial nerve was 3,5 mm and the mean distance to the closest volar branch was 9,8 mm. The mean distance between the closest
branch of the superficial radial nerve and Lister?s tubercle was 16,4 mm. The crossing point between the nerve and the cephalic
vein was located at a mean of 54,3 mm proximal to the styloid process. At the level of styloid process the mean distance between
the closest dorsal branch of the superficial radial nerve and the first dorsal compartment was 15,2 mm and between the closest
volar branch and the first dorsal compartment 4,4 mm. Detailed knowledge of anatomic characteristics of the superficial branch
of the radial nerve may help prevent injury during operations and treat traumatic lesions of the nerve. Because of great variations
in the course of the superficial radial nerve we could not define an absolute safe zone for surgical procedures on the distal
forearm. Iatrogenic lesions of the superficial radial nerve are described complications of percutaneous procedures. Therefore
open surgical approaches are recommended.
Daniela Klitscher and Lars Peter Müller contributed equally to this work. 相似文献
138.
139.
Benign schwannoma of the pancreas 总被引:2,自引:0,他引:2
Labile Togba Soumaoro Kenichi Teramoto Tohru Kawamura Noriaki Nakamura Takahiro Sanada Kenichi Sugihara Shigeki Arii 《Journal of gastrointestinal surgery》2005,9(2):288-290
Reported cases of intrapancreatic schwannomas have recently increased in the literature. However, none of these cases were
diagnosed clearly as schwannoma preoperatively. We herein describe the clinicopathologic findings of a solitary benign schwannoma
occurring in the head of the pancreas. Additionally, the differential diagnosis versus other cystic- and solid-appearing pancreatic
masses is briefly discussed. 相似文献
140.
Hung J. Kim Torrance Jackson Konrad Noben–Trauth 《Journal of the Association for Research in Otolaryngology》2003,4(1):83-90
Genetic studies on spontaneous mouse mutants with hearing defects have provided important insights into the function of genes
expressed in inner ear hair cells. Here we report on our genetic analyses of the deaf mutants varitint-waddler (Va) and jerker
(Espnje). A high-resolution genetic map localizes VaJ to a 0.14 ± 0.08 cM region between D3Mit85 and D3Mit259 on distal chromosome
3. By comparative mapping, the human ortholog resides at 1p22.3 between markers D1S3449 and D1S2252. To study the effect of
different genetic backgrounds on the hearing phenotype, Espnje and VaJ were crossed to various inbred strains. Auditory-evoked
brainstem response tests on F2 progeny demonstrate that expression, inheritance, and penetrance of the hearing phenotype are
solely controlled by the mutant allele. To test for a genetic interaction between Espnje and Cdh23v, auditory function was
analyzed in double heterozygotes; no significant increases of thresholds of sound pressure levels were observed. The results
establish the framework for cloning the Va gene and provide valuable insights into the genetics of deafness mutations in the
mouse. 相似文献