全文获取类型
收费全文 | 1156篇 |
免费 | 99篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 37篇 |
妇产科学 | 9篇 |
基础医学 | 78篇 |
口腔科学 | 28篇 |
临床医学 | 334篇 |
内科学 | 274篇 |
皮肤病学 | 3篇 |
神经病学 | 46篇 |
特种医学 | 165篇 |
外科学 | 112篇 |
综合类 | 31篇 |
一般理论 | 1篇 |
预防医学 | 72篇 |
眼科学 | 3篇 |
药学 | 41篇 |
肿瘤学 | 39篇 |
出版年
2023年 | 16篇 |
2022年 | 17篇 |
2021年 | 45篇 |
2020年 | 23篇 |
2019年 | 30篇 |
2018年 | 27篇 |
2017年 | 25篇 |
2016年 | 29篇 |
2015年 | 24篇 |
2014年 | 31篇 |
2013年 | 46篇 |
2012年 | 42篇 |
2011年 | 44篇 |
2010年 | 34篇 |
2009年 | 68篇 |
2008年 | 49篇 |
2007年 | 32篇 |
2006年 | 24篇 |
2005年 | 29篇 |
2004年 | 10篇 |
2003年 | 24篇 |
2002年 | 18篇 |
2001年 | 19篇 |
2000年 | 23篇 |
1999年 | 21篇 |
1998年 | 42篇 |
1997年 | 39篇 |
1996年 | 40篇 |
1995年 | 36篇 |
1994年 | 24篇 |
1993年 | 28篇 |
1992年 | 12篇 |
1991年 | 12篇 |
1990年 | 17篇 |
1989年 | 29篇 |
1988年 | 29篇 |
1987年 | 19篇 |
1986年 | 12篇 |
1985年 | 21篇 |
1984年 | 16篇 |
1983年 | 12篇 |
1982年 | 24篇 |
1981年 | 16篇 |
1980年 | 21篇 |
1979年 | 7篇 |
1978年 | 12篇 |
1977年 | 15篇 |
1976年 | 9篇 |
1971年 | 6篇 |
1967年 | 4篇 |
排序方式: 共有1275条查询结果,搜索用时 0 毫秒
51.
52.
Primary headaches, including migraine and medication overuse headache (MOH), can be conceptualized as biobehavioral disorders
based on the interaction of biological, psychological, and environmental factors. This article reviews empirically supported
and efficacious behavioral approaches to the treatment and management of headaches in general, with an emphasis on migraine
and MOH from a biopsychosocial perspective. Evidence-based behavioral medicine treatments for migraine and MOH are reviewed,
including patient education, cognitive behavioral therapy, and biobehavioral training (biofeedback, relaxation training, and
stress management). Information regarding psychological comorbidities and risk factors for progression of migraine and the
development of MOH is also reviewed. Strategies are provided for enhancing adherence and motivation, as well as facilitating
medical communication. 相似文献
53.
DC Wilson MJ Cunningham MMcC Reid SS Johnston TF Fannin 《Acta paediatrica (Oslo, Norway : 1992)》1992,81(1):84-85
A baby with unilateral cleft lip, midline cleft palate and hypertelorism developed meningitis in the first 48 h of life. Examination of the nasopharynx showed a soft tissue mass, which was confirmed as a basal encephalocele by computed tomography. There was also congenital hydrocephalus and the corpus callosum was absent. Surgical treatment included repair of the anterior basal skull defect, repair of the lip and palate, and ventriculo-peritoneal shunt. There is currently evidence of developmental delay and right-sided visual impairment due to Morning Glory syndrome. This case demonstrates that basal encephalocele should be considered in any baby with midline facial deformity who develops meningitis. 相似文献
54.
Biedermann B Wolf S Kohen L Wiedemann P Buse E Reichenbach A Pannicke T 《Journal of neuroscience methods》2002,120(2):173-178
Human and other primate retinal Müller cells display dominating K+ currents as well as other membrane conductances that may change in cases of retinal pathology. Because the use of human and primate tissue is limited by reasons of availability, a method for long-term storage of these cells is desirable. We describe a cryopreservation method in which isolated Müller cells are stored in liquid nitrogen. After thawing, the cells can be used for patch-clamp experiments immediately, without culturing. We show that the main electrophysiological properties are not altered by this method and that voltage- and ligand-gated currents can be recorded from cryopreserved cells even after 2-years storage. 相似文献
55.
Loss of tumor-promoting activity of unleaded gasoline in N- nitrosodiethylamine-initiated ovariectomized B6C3F1 mouse liver 总被引:1,自引:0,他引:1
Unleaded gasoline (UG) vapor (2056 ppm) increased the incidence of liver
tumors in a chronic bioassay and exhibited tumor-promoting activity in
N-nitrosodiethylamine (DEN)-initiated female mouse liver. Estrogen
inhibited mouse liver tumor development and the hepatocarcinogenic and
tumor-promoting dose of UG produced uterine changes suggestive of estrogen
antagonism. To directly test the hypothesis that UG-induced tumor-promoting
ability is secondary to its interaction with the mouse liver tumor
inhibitor, estrogen, we compared the tumor-promoting ability of UG in
ovariectomized (Ovex) mice with the hepatic tumor-promoting ability of UG
in intact mice. Ovaries were surgically removed at 4 weeks of age. Exposure
to wholly vaporized UG (2018 ppm) under bioassay and tumor-promoting
conditions began at 8 weeks of age. After 4 months of exposure, UG
increased relative liver weight and hepatic microsomal cytochrome P450
pentoxyresourfin-O- dealkylase and ethoxyresorufin-O-deethylase activity to
a similar extent in intact and Ovex mice. Non-focal hepatocyte
proliferation, as measured by the incorporation of bromo-deoxyuridine, was
not changed by UG exposure and was similar in all treatment groups. After 4
months of exposure to DEN-initiated mice, UG significantly increased the
volume fraction of liver occupied by foci (three-fold) as compared to
control intact mice. As expected, volume of foci was elevated in
DEN/Ovex/control mice as compared to DEN/intact/control mice. In DEN/Ovex
mice UG did not significantly increase the focal volume fraction. Thus, the
tumor promoting activity of UG, as demonstrated by increased volume
fraction of liver occupied by hepatic foci in intact mice, is greatly
attenuated in Ovex mice. The volume fraction data in Ovex mice support the
hypothesis that the tumor promoting activity of UG is dependent upon the
interaction of UG with ovarian hormones. These data also indicate that
hepatic microsomal cytochrome P450 PROD and EROD induction, hepatomegaly
and non-focal hepatic LI are not specific markers of hepatic tumor
promoting activity of UG.
相似文献
56.
Perkins SN; Hursting SD; Haines DC; James SJ; Miller BJ; Phang JM 《Carcinogenesis》1997,18(5):989-994
Transgenic mice with both alleles of the p53 tumor suppressor gene product
'knocked out' by gene targeting are susceptible to early development of
tumors, chiefly lymphomas and sarcomas. Compared with the control group,
administration of dehydroepiandrosterone (DHEA) at 0.3% of the diet to male
p53-deficient mice extended their lifespan by delaying death due to
neoplasms (from 105 to 166 days on study, P = 0.002), primarily by
suppressing lymphoblastic lymphoma (from 45 to 6% of neoplastic deaths, P =
0.010). Treatment with a synthetic DHEA analog,
16alpha-fluoro-5-androsten-17-one (compound 8354), at 0.15% of the diet
also increased lifespan, to 140 days for mice that developed tumors (P =
0.037). The effects of these steroids on lifespan and tumor development did
not appear to be strongly related to inhibition of food consumption and
weight gain, in that a group pair-fed with control diet to the reduced food
consumption of the DHEA-treated group developed and died of the same types
of neoplasms at the same rate as the controls fed ad libitum. The
chemopreventive effect of these steroids has been proposed to be due to
suppression of DNA synthesis by inhibition of glucose 6-phosphate
dehydrogenase, the rate-limiting enzyme of the pentose phosphate pathway.
Although DHEA and its analog are strong non- competitive inhibitors of this
enzyme in vitro, treatment with DHEA did not deplete cellular nucleotide
pools in the liver, as would have been predicted. The chemopreventive
effect of DHEA in this model may be due to steroid-induced thymic atrophy
and suppression of T cell lymphoma, permitting these mice to survive long
enough to develop tumors with longer latency.
相似文献
57.
Wu DC; Liu JM; Chen YM; Yang S; Liu SM; Chen LT; Whang-Peng J 《Japanese journal of clinical oncology》1997,27(2):115-118
Hemolytic uremic syndrome spontaneously arises in a few patients with
advanced cancer, but it is more commonly related to the use of certain
chemotherapeutic agents. Mitomycin-C is, etiologically, the most common
causative agent inducing hemolytic uremic syndrome, in a dose dependent
manner. We report this syndrome, attributable to mitomycin-C at a
cumulative dose of 40 mg/m2, in a gastric cancer patient. A 42-year-old
female with stage III gastric cancer underwent radical gastrectomy and was
given mitomycin-C at 10 mg/m2 intravenously every four weeks as adjuvant
therapy. Hemolytic uremic syndrome was diagnosed three months after the
last dose of mitomycin-C administration. The most prominent symptoms
included pallor, hypertension and anasarca, with laboratory evidence of
microangiopathic hemolytic anemia, azotemia and hyperkalemia. Her disease
was progressive, but fortunately stabilized after staphylococcus column A
dialysis. Her disease remained in remission for 24 months from the time of
diagnosis, and then relapsed in the form of peritoneal carcinomatosis with
partial intestinal obstruction.
相似文献
58.
59.
60.
J L Faoagali P De Buse G M Strutton H Samaratunga 《The Medical journal of Australia》1988,149(11-12):702-707
Details of the clinical and laboratory findings of the first case of rabies to be described in Australia are presented. The veterinary, public-health, travel and diagnostic problems and implications are discussed. 相似文献