全文获取类型
收费全文 | 1478篇 |
免费 | 94篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 89篇 |
妇产科学 | 29篇 |
基础医学 | 151篇 |
口腔科学 | 66篇 |
临床医学 | 110篇 |
内科学 | 287篇 |
皮肤病学 | 33篇 |
神经病学 | 29篇 |
特种医学 | 70篇 |
外科学 | 234篇 |
综合类 | 113篇 |
预防医学 | 72篇 |
眼科学 | 35篇 |
药学 | 163篇 |
中国医学 | 2篇 |
肿瘤学 | 87篇 |
出版年
2022年 | 27篇 |
2021年 | 53篇 |
2020年 | 15篇 |
2019年 | 32篇 |
2018年 | 37篇 |
2017年 | 24篇 |
2016年 | 29篇 |
2015年 | 28篇 |
2014年 | 39篇 |
2013年 | 59篇 |
2012年 | 89篇 |
2011年 | 81篇 |
2010年 | 57篇 |
2009年 | 47篇 |
2008年 | 73篇 |
2007年 | 77篇 |
2006年 | 78篇 |
2005年 | 65篇 |
2004年 | 57篇 |
2003年 | 51篇 |
2002年 | 36篇 |
2001年 | 25篇 |
2000年 | 30篇 |
1999年 | 43篇 |
1998年 | 38篇 |
1997年 | 24篇 |
1996年 | 20篇 |
1995年 | 8篇 |
1994年 | 23篇 |
1993年 | 14篇 |
1992年 | 23篇 |
1991年 | 22篇 |
1990年 | 19篇 |
1989年 | 36篇 |
1988年 | 24篇 |
1987年 | 13篇 |
1986年 | 18篇 |
1985年 | 12篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 10篇 |
1979年 | 13篇 |
1978年 | 8篇 |
1977年 | 8篇 |
1976年 | 7篇 |
1975年 | 8篇 |
1974年 | 9篇 |
1969年 | 9篇 |
排序方式: 共有1582条查询结果,搜索用时 15 毫秒
1.
2.
After resection at birth of an accessory left foot, a white male infant was followed up for a slowly enlarging posterior calf mass of the same leg. When the patient was 8 years old, the mass was thought to have enlarged sufficiently to warrant excisional biopsy. Histologic examination of the tumor was consistent with the diagnosis of a dermoid cyst, revealing a lesion lined with stratified squamous epithelium and containing cutaneous adnexal structures represented by eccrine sweat glands. A congenital dermoid in the extremities is unusual. The prognosis following removal is good, and recurrence is rare. 相似文献
3.
Training needs analysis is considered essential to professional and organizational development, for continuing education and for incorporation into professional practice. Increasingly, nurses are encouraged to develop their health promotion role. Despite this there has been relatively little research in Scotland into the health promotion role of the hospital nurse. This study describes the results of a health promotion training needs analysis undertaken on qualified, hospital-based nurses in Lanarkshire, Scotland. Information on the nurses' current health promotion practices, their attitudes and beliefs, their views on role development and priorities for further training were collated, analysed and discussed within the framework of the Health Action Model. This model was originally designed to assist understanding of the gap that exists between an individual intention to act and the eventual health action. However, in this study the ways in which ‘cognitive factors’ (knowledge and beliefs) and ‘motivational factors’ (considering values, attitudes and drives) and pressures from social norms and significant others assisted in the understanding of the nurse's orientation to, and beliefs about, health promotion practice. Fifty-seven per cent of nurses in the study considered health promotion activities to be emerging in clinical care and 4% considered them to be advanced. The interest respondents have in role development and the further integration of health promotion activities into nursing practice was explored by ascertaining the nurses' attitudes and beliefs about their own health promotion role. Of 107 respondents, a majority 72 (67%) agreed health promotion interventions to be an important function of the nurse with 29 (27%) strongly agreeing (n=107). Sixty per cent stated they would be interested in developing their role and 30% were very strongly interested. Recommendations are therefore made for future planning and development strategies for the health promotion role of hospital nurses. 相似文献
4.
Z. S. Meharwal N. Trehan V. M. Kohli V. K. Sharma R. R. Kasliwal A. Mishra V. Kohli A. Jayant 《Indian Journal of Thoracic and Cardiovascular Surgery》1992,8(2):88-91
Between November 1988 and February 1992, 416 patients required coronary endarterectomy for diffuse coronary artery disease.
This constitutes 16.19 per cent of all patients who underwent coronary artery bypass grafting during the same period. A total
of 528 endarterectomies were performed. Four-hundred and twenty-two endarterectomies were performed on right coronary system
and 106 endarterectomies were performed on left coronary system. One-hundred and twelve (26.92%) patients required more than
one endarterectomies.
The hospital mortality was 2.16 percent. 3.37 per cent of patients had perioperative infarction. Intraaortic balloon pump
was required in 1.92 per cent of patients. 5.77 per cent of the patients had significant arrhythmias. The patients have been
followed up for a mean period of 27 months. One-hundred and forty patients were evaluated by exercise multigated radionuclide
angiogram. One-hundred and thirty-four (95.71%) patients showed increase in ejection fraction as compared to preoperative
value. Six (4.29%) patients did not show any significant change while eight (5.71%) patients had fall in ejection fraction.
Postoperative coronary angiogram was done in 44 patients at a mean of 10 months. 89.59 per cent of grafts to the endarterectomised
vessels and 91.67% of grafts to nonendarterectomised vessel were patent. The difference between the two groups was not statistically
significant. 相似文献
5.
6.
7.
alpha-Adrenoceptor agonists decreased mean arterial pressure when injected into the arterial blood supply of the paraspinal sympathetic ganglia of pentobarbital-anesthetized open-chest dogs. The hypotensive response occurred concomitantly with selective decreases of vascular resistance in the vessels innervated by neurons arising from these ganglia, and both of these responses were blocked by the ganglionic blocking agent, hexamethonium. The hypotensive response to phenylephrine was selectively blocked by terazosin; alpha 1 selective agonist, and antagonist, respectively, while the hypotension produced by intra-arterial clonidine was blocked by rauwolscine; alpha 2 selective agonist and antagonist, respectively. Either terazosin or rauwolscine reduced the hypotension produced by noradrenaline or dopamine. These results demonstrated the presence of both alpha 1- and alpha 2-adrenoceptors in the paraspinal sympathetic ganglia. Activation of either alpha-adrenoceptor subtype inhibited ganglionic transmission. 相似文献
8.
9.
10.
K. S. Kohli D. V. Rai P. Kumar V. K. Jindal Dr. N. Goyal 《Medical & biological engineering & computing》1997,35(4):348-353
The complex electrical impedance of a goat eye lens is studied in the frequency range 10mHz−10Hz at room temperature, using
a computer-controlled AC impedance system. AC impedance software (model 368, version 2.2) is employed to determine the total
impedance and capacitance of the eye lens at various frequencies. A Cole-Cole plot of the eye lens material is drawn between
the real component of impedance Z′ and the imaginary component Z″ for each excitation frequency that shows a perfect arc of
a semicircle, with its centre lying below the abscissa at an angle of 35°. The half-angle ϕ between R0 and R∞ is found to be 55°, which mathematically demonstrates the selective permeability of the eye lens. Using graphical analysis
of the Cole-Cole plot, characteristic frequency fc and distribution factor α are observed to be 1Hz and 0.77, respectively. At characteristic frequency, capacitance and total
impedance are found to be 1.14μF and 9.08kΩ. The effect of electrode polarisation on capacitance is corrected, based on Fricke's
power function. The observed electrical parameters are then used to explain the multiple current path through various tissue
compartments. Further, an attempt is made to explain the results on the basis of a possible dipolar model. 相似文献