全文获取类型
收费全文 | 19046篇 |
免费 | 1771篇 |
国内免费 | 32篇 |
专业分类
耳鼻咽喉 | 240篇 |
儿科学 | 613篇 |
妇产科学 | 401篇 |
基础医学 | 2297篇 |
口腔科学 | 373篇 |
临床医学 | 2535篇 |
内科学 | 3666篇 |
皮肤病学 | 222篇 |
神经病学 | 1411篇 |
特种医学 | 1018篇 |
外国民族医学 | 3篇 |
外科学 | 2465篇 |
综合类 | 477篇 |
一般理论 | 9篇 |
预防医学 | 2003篇 |
眼科学 | 601篇 |
药学 | 1513篇 |
中国医学 | 13篇 |
肿瘤学 | 989篇 |
出版年
2021年 | 321篇 |
2020年 | 209篇 |
2019年 | 295篇 |
2018年 | 335篇 |
2017年 | 206篇 |
2016年 | 289篇 |
2015年 | 312篇 |
2014年 | 417篇 |
2013年 | 593篇 |
2012年 | 805篇 |
2011年 | 872篇 |
2010年 | 500篇 |
2009年 | 424篇 |
2008年 | 738篇 |
2007年 | 848篇 |
2006年 | 857篇 |
2005年 | 790篇 |
2004年 | 780篇 |
2003年 | 697篇 |
2002年 | 656篇 |
2001年 | 577篇 |
2000年 | 606篇 |
1999年 | 546篇 |
1998年 | 306篇 |
1997年 | 256篇 |
1996年 | 262篇 |
1995年 | 235篇 |
1994年 | 214篇 |
1993年 | 209篇 |
1992年 | 419篇 |
1991年 | 421篇 |
1990年 | 394篇 |
1989年 | 436篇 |
1988年 | 369篇 |
1987年 | 366篇 |
1986年 | 352篇 |
1985年 | 343篇 |
1984年 | 285篇 |
1983年 | 239篇 |
1982年 | 172篇 |
1981年 | 141篇 |
1980年 | 131篇 |
1979年 | 199篇 |
1978年 | 183篇 |
1977年 | 159篇 |
1976年 | 148篇 |
1975年 | 121篇 |
1974年 | 160篇 |
1973年 | 144篇 |
1972年 | 129篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
S W Jackson 《The American journal of psychiatry》1992,149(12):1623-1632
OBJECTIVE: The purpose of this paper is the assessment of the healer's listening as an aspect of the history of caring and curing, with particular attention to its place in psychological healing. METHOD: An extensive range of philosophical, religious, and medical sources from antiquity to the present were studied. RESULTS: Over the centuries, listening has been a crucial aspect of the various endeavors undertaken by healers in the interest of acquiring information from, achieving understanding of, and bringing about healing effects for sufferers. Yet it has been vision rather than hearing that has been emphasized in knowing and understanding, and looking rather than listening that has been emphasized in healing endeavors. Only around the turn of the twentieth century did there emerge the focused study of care in listening, of listening beyond the words themselves, and of the significance of the interested listener as a soothing, empathic force. CONCLUSIONS: The place of listening in depth and with empathy is a crucial element in healing. While the emphasis on looking remains significant in the gathering and appraisal of data, at times it threatens to overwhelm the need for an attentive and concerned listener. There appears to be a natural tension between the two modes that has, in modern times, been translated into a tension between the two modes that has, in modern times, been translated into a tension between a scientific mode of gaining information and a humanistic mode of knowing sufferers. A healer neglects either one at his or her peril--and at the peril of his or her patients. 相似文献
102.
Nineteen male soldiers participated in a study of the effectiveness of two antiperspirants (aluminum chlorohydrate and aluminum zirconium tetrachlorohydrex glycine) in reducing foot-sweat accumulation and injuries. Each subject was tested before and after antiperspirant application, with a 1-hour treadmill march at 5.6 km/hour in a warm environment. Both antiperspirants decreased (p less than 0.05) foot-sweat accumulation over 50%. There was also a tendency, although not statistically significant, for subjects to incur fewer blisters with antiperspirant use. However, the antiperspirants also increased (p less than 0.05) the incidence of irritant dermatitis. Nevertheless, these data suggest that the application of antiperspirants to the feet has merit in reducing serious foot injuries (blisters, trench foot) exacerbated by wet feet. 相似文献
103.
Effects of exercise training on men seropositive for the human immunodeficiency virus-1. 总被引:1,自引:0,他引:1
L W Rigsby R K Dishman A W Jackson G S Maclean P B Raven 《Medicine and science in sports and exercise》1992,24(1):6-12
We examined the effects of chronic exercise on fitness and immune status in Caucasian males (34.9 +/- 5.6 yr) diagnosed by Western blot as seropositive for the HIV-1 virus. The exercise regimen involved 12 wk of 1 h sessions 3 d.wk: 20 min of cycle exercise at 60-80% HRreserve was followed by 35 min of strength and flexibility training. After matching subjects on health status (modified Walter Reed criteria), subjects (N = 37) were randomly assigned to exercise or a counseling control condition. Changes in strength, responses to the YMCA cycle test, and serum lymphocytes were tested by MANOVA in a condition (exercise or counseling)-by-time (pretest, posttest) design with repeated measures on time. Results indicated significant (P less than 0.001) group-by-time interactions for strength (N.m) (chest press and leg extension) and for HR (beats.min-1) and total time (TT) on the cycle test at 150 W. Strength and TT increased and HR decreased in the exercise condition, while control subjects did not change. Total leukocyte, lymphocyte, CD4+, and CD8+ cell counts, and the CD4+/CD8+ ratio were statistically unchanged for each condition. We conclude that HIV-1+ men, including those symptomatic for AIDS-related complex, can experience significant increases in neuromuscular strength and cardiorespiratory fitness without changes in lymphocyte phenotypes or clinical diagnosis when the exercise regimen is prescribed and monitored in accordance with ACSM guidelines for healthy adults. 相似文献
104.
Receptor subtypes mediating facilitation by serotonin of excitability of spinal motoneurons 总被引:4,自引:0,他引:4
Serotonin receptor ligands, with differential affinity for subtypes of serotonin (5-HT) receptors, were administered intravenously or iontophoretically to urethane-anesthetized rats and the effects of these compounds on glutamate-evoked firing of spinal motoneurons were tested. The excitability of spinal motoneurons was markedly enhanced after intravenous administration of the selective 5-HT1A ligand 8-hydroxy-2-(di-n-propylamino) tetralin (DPAT) in rats with acute spinal transections at C1. However, local application of DPAT, directly into the ventral horn by microiontophoresis, inhibited the glutamate-evoked firing of motoneurons in direct contrast to the facilitatory effects of iontophoretically applied 5-HT. The DPAT-induced inhibition may have been nonspecific, since it was not antagonized by methysergide. Other 5-HT agonists, with relatively selective affinity for 5-HT1B, 5-HT1C and 5-HT2 receptors, increased the excitability of spinal motoneurons when applied iontophoretically or intravenously. The excitatory effect of iontophoretically applied 5-HT was antagonized by the nonselective 5-HT antagonist, methysergide and by ketanserin and ritanserin, which have relatively selective affinity for 5-HT1C and 5-HT2 receptors. These results indicate that 5-HT1A receptors do not mediate facilitation of excitability of motoneurons produced by local application of 5-HT directly into the vicinity of the motoneurons. However, the marked increase in firing of motoneurons that was caused by intravenous administration of DPAT in spinal transected rats, suggests that 5-HT1A receptors in the spinal cord may participate in 5-HT-induced enhancement of somatomotor outflow, at sites presynaptic to the motoneurons. The iontophoretic results suggest that 5-HT1B, 5-HT1C and 5-HT2 receptors may all play a role in facilitation of the excitability of spinal motoneurons by locally applied 5-HT. Differentiation between these subtypes of receptor awaits the development of more completely selective agonists and antagonists. 相似文献
105.
Administration of antiserum to thyrotropin-releasing hormone (TRH) into the lateral cerebral ventricle of mice significantly attenuated recovery from hyperglycemia induced by treatment with 2-deoxyglucose but had no effect on the plasma glucose of saline-treated mice. TRH, injected centrally together with the anti-TRH antibody, reversed the effect of the antiserum and blocked the development of hyperglycemia. These findings suggest that activation of TRH neurons in the central nervous system may be a physiological event influencing recovery from hyperglycemia. 相似文献
106.
107.
Chenicheri Balakrishnan Venkata S Erella Christopher Vashi Ollie Jackson Shawn Vandemark 《CANADIAN JOURNAL OF PLASTIC SURGERY》2007,15(3):153-154
Self-inflicted burns represent a major social and medical problem for society. Differences have been demonstrated between patients who attempt suicide and those who deliberately harm themselves without any intention of killing themselves. These self-inflicted injuries may resemble injuries that are intentionally inflicted by others and may require investigation by protective services. Little is known about these specific pattern burn injuries in psychiatric patients. 相似文献
108.
Kristina Jackson Behan 《Clinical laboratory science》2005,18(4):221-225
OBJECTIVE: Screening for diabetes is recommended for individuals > or =45 years of age, or earlier if they manifest > or = one specific risk factors. This study examined the sensitivity and positive predictive value (PPV) of risk factor total for identifying individuals with diabetes and prediabetes. DESIGN: Subjects were interviewed to assess the presence of risk factors. Fasting plasma glucose levels were obtained. SETTING: The study occurred at a health fair in Greensburg, PA. PATIENTS: Six hundred sixty-one Caucasians between the ages of 19 and 100. RESULTS: Using the criterion of screening individuals with > or = one risk factors detected 100% of both diabetics and prediabetics. This dropped to 91.2% when screening individuals with > or = two factors. The PPV of the risk factor total was poor (80% of individuals with a total of four factors were not diabetic). The ability of the risk factor total to predict individuals with impaired glucose metabolism (prediabetics + diabetics) was considerably better, and increased almost linearly with the risk factor total. Of the subjects with normal glucose values, the mean glucose increased as the risk factor total increased. CONCLUSION: While the sensitivity of using > one risk factor as an algorithm to screen is 100% for identifying diabetics, the PPV of risk factor analysis for identifying diabetics is poor. The same algorithm works well to identify at-risk individuals, presumably allowing early intervention and education. 相似文献
109.
S Warburton M A Jackson R Norton M Bhabra 《中国处方药》2004,(10):83-84
当病人出现咳血、胸膜痛等症状,一般都会诊断为肺栓塞。现在有一种趋势就是为了不耽误病人的治疗,在诊断阶段还没有彻底的检查就开始治疗。通常早期使用肝素来减少可疑为肺栓塞病人的死亡率和发病率。然而,如道其它一些并不常见的咳血的原因也非常重要。 相似文献