全文获取类型
收费全文 | 17409篇 |
免费 | 1321篇 |
国内免费 | 411篇 |
专业分类
耳鼻咽喉 | 460篇 |
儿科学 | 74篇 |
妇产科学 | 184篇 |
基础医学 | 919篇 |
口腔科学 | 1311篇 |
临床医学 | 1142篇 |
内科学 | 1298篇 |
皮肤病学 | 1419篇 |
神经病学 | 378篇 |
特种医学 | 560篇 |
外国民族医学 | 1篇 |
外科学 | 4036篇 |
综合类 | 2085篇 |
现状与发展 | 1篇 |
预防医学 | 371篇 |
眼科学 | 3499篇 |
药学 | 784篇 |
7篇 | |
中国医学 | 279篇 |
肿瘤学 | 333篇 |
出版年
2024年 | 44篇 |
2023年 | 286篇 |
2022年 | 339篇 |
2021年 | 776篇 |
2020年 | 623篇 |
2019年 | 512篇 |
2018年 | 507篇 |
2017年 | 580篇 |
2016年 | 669篇 |
2015年 | 565篇 |
2014年 | 1033篇 |
2013年 | 1141篇 |
2012年 | 881篇 |
2011年 | 1000篇 |
2010年 | 858篇 |
2009年 | 875篇 |
2008年 | 841篇 |
2007年 | 823篇 |
2006年 | 762篇 |
2005年 | 682篇 |
2004年 | 620篇 |
2003年 | 526篇 |
2002年 | 436篇 |
2001年 | 452篇 |
2000年 | 353篇 |
1999年 | 275篇 |
1998年 | 299篇 |
1997年 | 288篇 |
1996年 | 252篇 |
1995年 | 205篇 |
1994年 | 212篇 |
1993年 | 190篇 |
1992年 | 165篇 |
1991年 | 155篇 |
1990年 | 128篇 |
1989年 | 113篇 |
1988年 | 101篇 |
1987年 | 106篇 |
1986年 | 87篇 |
1985年 | 106篇 |
1984年 | 89篇 |
1983年 | 60篇 |
1982年 | 45篇 |
1981年 | 36篇 |
1980年 | 26篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 22 毫秒
71.
The use of a triple lumen central venous catheter, which can be shielded from laser irradiation by metal tape, as a conduit for high frequency jet ventilation in six children, is described. The problems of anaesthesia for laryngeal laser surgery and the advantages of the technique described in this paper are discussed. 相似文献
72.
目前在青光眼的临床治疗中,激光治疗已成为介于药物和手术治疗之间的一种方法,本文仅就原发性闭角型青光眼的激光周边虹膜透切术和开角型青光眼的激光滤帘成形术做一介绍。 相似文献
73.
本文将45例经Nd:YAG激光治疗的膀胱癌患者随机分组,对33例做了卡介苗(BCG)膀胱灌注,12例做了噻替派(thiotepa)膀胱灌注,并分别随访了3~18个月,平均9.8个月,BCC组膀胱癌再发率3%(1/33),噻替派组膀胱癌再发率为25%(3/12)(P<0.01)。 相似文献
74.
. R. Kakigi H. Shibasaki T. Lkeda R. Neshige C. Endo Y. Kuroda 《Acta neurologica Scandinavica》1992,85(5):347-352
Pain-related somatosensory evoked potentials (pain SEPs) following CO2 laser stimulation were examined in 30 patients with peripheral neuropathies, and the results were compared with clinical sensory findings. Pain SEP findings showed a significant correlation with the clinical impairment of pain sensation, but not with the impairment of deep sensations. In contrast, conventional electrically-stimulated SEPs (electric SEPs) showed a significant correlation with deep sensations, but not with the impairment of pain sensation. Examinations of both pain SEPs and electric SEPs, therefore, are considered to be very useful to evaluate physiological functions of sensory nerves in patients with peripheral neuropathies. 相似文献
75.
S Kimel L O Svaasand M Hammer-Wilson V Gottfried S Cheng E Svaasand M W Berns 《Lasers in surgery and medicine》1992,12(4):432-440
The chick chorioallantoic membrane (CAM) model was used to study vascular effects of photodynamic therapy (PDT) and hyperthermia (HPT) and the synergism of these modalities. The CAM is a convenient medium for monitoring the modifications of the vasculature. It is possible to view the CAM and to examine structural changes of individual blood vessels in real time. Moreover, the CAM is a closed system which lends itself to mathematical modeling of the temporal and spatial temperature profile and in which HPT can be performed quantitatively and to a selected depth, using different lasers. A porphyrin-type photosensitizer solution was applied to areas of the CAM, defined by teflon O-rings placed on the surface. Uptake dynamics of the sensitizer into the CAM was determined by analyzing its fluorescence in vivo. The CAM area was irradiated with a dual-wavelength laser system composed of a dye laser at 644 nm (to induce PDT) and a CO2 laser at 10.6 microns (to bring about HPT). Damage to the CAM vasculature, due to combined PDT+HPT, was compared to the outcome of the separate modalities, and a synergistic effect of about 40% was observed. 相似文献
76.
Data on the effects of laser radiation on primary teeth are scarce. This study investigates the effects of exposing sound
enamel, photo-initiated sound enamel, sound dentine and carious dentine of extracted primary teeth to a pulsed neodymium-yttrium
aluminium garnet laser (Nd-YAG, wavelength 1.06 μm, pulse length 15μs). Each type of tissue was exposed to three fiuences.
Qualitative and quantitative assessments of the irradiated areas revealed that the most marked changes were produced in carious
dentine, followed in ranking order by sound dentine, photo-initiated enamel and sound enamel. Evidence of thermal damage to
the hard tissues peripheral to the fibre-optic tip, and considerable inter-sample variation were found. The experimental evidence
obtained in this in vitro study does not support the clinical use of pulsed laser at 1.06 μm wavelength for cutting primary
enamel and dentine. 相似文献
77.
刘建勋 《中国激光医学杂志》1992,1(2):109-111
本文较详细地介绍了应用激光技术即用CO_2及Nd:YAG激光手术刀治疗各种类型痔的临床观察。我院自1988年应用CO_2及Nd,YAG(以下简称激光手术刀)的技术治疗各种痔1376例均取得满意的治疗效果,治愈率达100%,并对有关问题进行探讨。 相似文献
78.
G. RAYMAN S. A. WILLIAMS J. GAMBLE J. E. TOOKE 《European journal of clinical investigation》1994,24(12):830-836
Abstract. The effect of lowering the foot on the factors governing fluid filtration in the foot were studied in 12 male insulin-dependent diabetic subjects and 10 controls. Toe skin blood flow, measured by laser Doppler flowmetry, was significantly higher during dependency in the diabetic group. In the control subjects, the colloid osmotic pressure of venous blood sampled from the foot rose to 47·7 mmHg (range 45·1–53·8) after 50 min of foot dependency. In the diabetic group, colloid osmotic pressure failed to rise to the same extent (median 36·7 mmHg; range 28·6–43·0; P < 0·001). Capillary pressure, measured directly by the Landis microinjection technique, was significantly higher in the diabetic group (85·3±1·7 ( n = 6) vs. 92·2±4·6 cm H2 O ( n = 6); P < 0·007), as was foot swelling rate determined by mercury strain gauge plethysmography (0·069±0·022 vs. 0·099±0·025 ml min-1 100ml-1 ; P < 0·02). These results suggest an impairment of the oedema-preventing mechanisms in diabetic subjects which may contribute to the risks of ulceration in the diabetic foot. 相似文献
79.
Ken Kodama Osamu Doi Masahiko Higashiyama Hideoki Yokouchi Keiko Kuriyama 《Surgery today》1997,27(12):1123-1130
Between 1969 and 1995, 180 patients underwent complete resection of lung metastases during initial thoracotomy at our institute,
involving the resection of 917 pulmonary nodules at 202 thoracotomy procedures. The overall postmetastasectomy 5- and 10-year
survival rates were 46% and 30%, respectively. Of 111 patients who underwent segmentectomy and/or local excision, 57 had multiple
metastases, 39 of whom were treated by Nd:YAG laser after 1986, and 18 by conventional procedures before 1985. The average
number of tumors resected per patient treated with the Nd:YAG laser was significantly greater than that of those treated with
conventional procedures. However, the survival curve of the laser-treated group was better than that of the laser-nontreated
group. Moreover, slightly better survival was achieved in patients operated on after 1992 compared with those operated on
before 1991. We conclude that the laser technique may be warranted to afford complete resection of metastases and adequate
pulmonary reservation in combination with a selected approach for thoracotomy under the exact detection of tumor localization
using the most recent high-quality computed tomography (CT) scan. Furthermore, a one-stage operation to control synchronous
intra- and extrapulmonary malignamcies may become a possible option in combination with selective adjunctive therapy. 相似文献
80.
本文报道准分子激光冠脉成形术(ELCA)8例,均为男性,年龄平均61岁。心梗4例(2例有梗塞后心绞痛),4例仅表现为心绞痛。冠脉造影显示LAD狭窄6支,LCX狭窄4支,RCA狭窄4支。按ACC/AHA分型B型5例,C型3例。均用ELCA+PTCA。根据血管直径选用1.3mm(能量密度14.5mJ)和1.6mm(能量密度21.0mJ)激光导管,频率20Hz。1例导引钢丝未能通过狭窄,ELCA失败,另1例二次心梗,经旁路移植后仍有心绞痛发作,心功能较差,其ELCA虽获成功,但因病情严重死亡。8例中ELCA成功7例,手术成功6例。 相似文献