全文获取类型
收费全文 | 152篇 |
免费 | 13篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 2篇 |
妇产科学 | 4篇 |
基础医学 | 11篇 |
口腔科学 | 51篇 |
临床医学 | 4篇 |
内科学 | 19篇 |
神经病学 | 14篇 |
外科学 | 17篇 |
综合类 | 2篇 |
预防医学 | 18篇 |
药学 | 19篇 |
肿瘤学 | 2篇 |
出版年
2021年 | 6篇 |
2019年 | 2篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2014年 | 10篇 |
2013年 | 5篇 |
2012年 | 7篇 |
2011年 | 8篇 |
2010年 | 6篇 |
2009年 | 7篇 |
2008年 | 7篇 |
2007年 | 11篇 |
2006年 | 6篇 |
2005年 | 10篇 |
2004年 | 6篇 |
2003年 | 6篇 |
2002年 | 6篇 |
2001年 | 9篇 |
2000年 | 5篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1995年 | 1篇 |
1992年 | 2篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1971年 | 3篇 |
1970年 | 2篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1947年 | 1篇 |
1939年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有165条查询结果,搜索用时 31 毫秒
1.
2.
Methods of analyzing drug absorption data from rat intestinal-perfusion experiments are discussed in terms of mass-transfer resistances, or reciprocal permeabilities, and mass balances. Typically, a two-resistance model is used to determine the dimensionless effective permeability (P*eff) by measuring the disappearance of drug from the perfusing solution. Unstated assumptions in two-resistance models are (1) the portal blood is under sink conditions and (2) complete transfer of drug occurs from the intestinal perfusate to the portal vein. The assumption of sink conditions is generally acceptable, because the drug concentration in portal blood is approximately two orders of magnitude less than in the perfusate. Single-pass intestinal-perfusion experiments were performed on rats with theophylline as a model compound. The drug mass leaving the intestinal perfusate was substantially less than the drug mass appearing in the portal plasma; that is, the assumption of complete transfer did not hold for theophylline in this experimental system. These data indicate that models based on the two-resistance theory can lead to overestimation of P*eff by the ratio of the drug mass leaving the perfusate to the drug mass appearing in the plasma. For compounds for which the assumption of complete transfer does not hold, a more accurate estimate of P*eff may be determined by dividing the value derived from perfusate data by the mass balance ratio (i.e., the drug mass leaving the perfusate divided by the drug mass appearing in the plasma). 相似文献
3.
J. A. O. Besson A. N. Palin K. P. Ebmeier J. M. Eagles F. W. Smith 《International journal of geriatric psychiatry》1988,3(2):99-105
A double-blind placebo-controlled trial of the calcium antagonist Nimodipine in 10 patients with multi-infarct dementia (MID) shows that there is no improvement when compared with 10 patients on placebo assessed by clinical ratings and sequential NMR imaging. The value of repeated NMR imaging in measuring changes in MID is described. 相似文献
4.
This work has examined the effect of Miglyol 812 oil and its composite fatty acids on the oral absorption of propranolol with reference to its intravenous (i.v.) pharmacokinetics. Propranolol hydrochloride, spiked with 4-(3) H labelled compound, was administered i.v. or orally to male Wistar rats and blood concentrations of parent material determined by liquid scintillation counting after extraction into toluene. An i.v. dose-linearity study indicated dose-independent pharmacokinetics for propranolol at 1-2 mg kg-1, with a mean Cls, Vss, MRTi.v. and t0.5 beta of 0.076 L min-1 kg-1, 4.74 L kg-1, 57.81 min and 47.10 min, respectively. At 5 mg kg-1, there was evidence of non-linearity with MRTi.v. increased by about 250%, Vss by 170% and t0.5 beta by 230% compared with the lower doses. After oral administration of propranolol (10 mg kg-1) in aqueous solution, with or without Tween 80 (6%), the mean absorption time (MAT) and terminal half-life were approximately 55 min and 86 min, respectively. The MAT for propranolol administered in a 50% octanoic and lauric acid (1:1 by weight) oil-in-water emulsion, stabilized with 6% Tween 80 (129-90 min), was significantly longer compared with that for a 50% Miglyol 812 oil-in-water emulsion containing the same surfactant (16.55 min). The terminal half-life of propranolol administered in the fatty acid formulation (128.96 min), unlike that for the Miglyol emulsion (54-37 min), was significantly longer compared with that observed after i.v. administration (t0.5 beta = 47 min).(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
5.
Schlitt T Palin K Rung J Dietmann S Lappe M Ukkonen E Brazma A 《Genome research》2003,13(12):2568-2576
6.
OBJECTIVES: To determine, first, the prevalence and severity of various symptoms related to estrogen deficiency in women within a few years of receiving treatment for breast cancer, second, how women perceive the effects of these symptoms on their quality of life and, third, what measures have been taken to relieve vasomotor symptoms. METHODS: Two hundred women (aged 29-65 years) who had received treatment for breast cancer within the last 5 years were included in this cross-sectional survey. Information was collected about their breast cancer treatment, menopausal symptoms (Menopausal Rating Scale), the perceived effects of menopausal symptoms on their and their partner's quality of life and any treatments they were receiving for hot flushes. RESULTS: All but one woman reported at least one symptom related to the menopause (95.9% vasomotor; 83.3% psychological; 89.7% somatic). Current treatment with tamoxifen or previous chemotherapy did not influence the prevalence or the severity of hot flushes. Current antidepressant treatment was, however, significantly associated with a higher prevalence and severity of most menopausal symptoms, including hot flushes and sweats (p = 0.008). The severity of hot flushes and sweats was significantly correlated with self-assessed effects on overall quality of life (r(s) = 0.47); 56.4% of the respondents believed that menopausal symptoms had affected their partner's quality of life, the strongest correlations being with severity of sexual symptoms (r(s) = 0.56) and vaginal dryness (r(s) = 0.5). Only 21% of women experiencing hot flushes were receiving any treatment for hot flushes, with most women describing no knowledge or poor knowledge of treatment options. CONCLUSIONS: The majority of women receiving treatment for breast cancer report menopausal symptoms, which negatively correlate, not only with their own, but also with their partner's quality of life. Most women experiencing hot flushes are not receiving treatment due to lack of both awareness and confidence in the existing treatment options. 相似文献
7.
Christian Salerno Lucio Antonio Palin Kris Vanhaecht Massimiliano Panella 《International journal of environmental health research》2013,23(4):342-351
Cerano is a municipality of the Province of Novara (North-West Italy). To assess the morbidity associated to its proximity to a petrochemical plant, standardized incidence ratios (SIRs) of oncological pathologies in the period 2003–2009 were calculated based on age-sex specific rates for the district of the Local Health Authority of Novara (ASL13) and the main regional city of Turin. For all cancers combined, men showed a significant higher risk (SIR: 1.21; 95% CI: 1.02–1.40) compared to the ASL13 population; significantly lower risks for both men and women were observed in comparison to the Turin population. Among women, a significant excess of mesothelioma cancers was reported; a significantly higher risk for lympho-haematopoietic pathologies was also observed compared to the Turin population only. Several other cancers have significantly lower rates in Cerano for both men and women. Despite some studies’ limitations, these findings could suggest potential chemical risk factors and need further investigation. 相似文献
8.
The pathogenesis of benign prostatic hyperplasia is linked to the accumulation of dihydrotestosterone (DHT), the active form
of testosterone (T), in prostatic tissue. We have defined characteristics of 5α-reductase enzyme which catalyzes the conversion
of T into DHT in prostatic microsomes of growing pigs. Peaks for the 5α-reductase activity were found at pH 5.5 and 8.0, which
indicates the presence of both type 1 and type 2 isozymes. Kinetic parameters of porcine 5α-reductase in the presence of Serenoa repens extracts revealed uncompetitive, noncompetitive, and mixed types of inhibitions. Our results show the inhibitory action of
S. repens on prostate porcine microsomal 5α-reductase activity. 相似文献
9.
The first part of this series of two described the history of light curing in dentistry and developments in LED lights since their introduction over 20 years ago. Current second- and third-generation LED light units have progressively replaced their halogen lamp predecessors because of their inherent advantages. The background to this, together with the clinical issues relating to light curing and the possible solutions, are outlined in the second part of this article. Finally, the innovative features of what may be seen as the first of a new fourth-generation of LED lights are described and guidance is given for the practitioner on what factors to consider when seeking to purchase a new LED light activation unit. Clinical Relevance: Adequate curing in depth is fundamental to clinical success with any light-activated restoration. To achieve this goal predictably, an appropriate light source needs to be combined with materials knowledge, requisite clinical skills and attention to detail throughout the entire restoration process. As dentists increasingly use light-cured direct composites to restore large posterior restorations they need to appreciate the issues central to effective and efficient light curing and to know what to look for when seeking to purchase a new light-curing unit. 相似文献
10.
W.M. Palin M.A. Hadis J.G. Leprince G. Leloup L. Boland G.J.P. Fleming G. Krastl D.C. Watts 《Dental materials》2014