全文获取类型
收费全文 | 3958108篇 |
免费 | 318668篇 |
国内免费 | 14836篇 |
专业分类
耳鼻咽喉 | 54006篇 |
儿科学 | 126292篇 |
妇产科学 | 103257篇 |
基础医学 | 617983篇 |
口腔科学 | 106713篇 |
临床医学 | 358649篇 |
内科学 | 709951篇 |
皮肤病学 | 101653篇 |
神经病学 | 331442篇 |
特种医学 | 153832篇 |
外国民族医学 | 555篇 |
外科学 | 604050篇 |
综合类 | 117831篇 |
现状与发展 | 24篇 |
一般理论 | 2430篇 |
预防医学 | 330612篇 |
眼科学 | 92046篇 |
药学 | 273543篇 |
23篇 | |
中国医学 | 12104篇 |
肿瘤学 | 194616篇 |
出版年
2021年 | 55807篇 |
2020年 | 35594篇 |
2019年 | 58645篇 |
2018年 | 73143篇 |
2017年 | 55940篇 |
2016年 | 61779篇 |
2015年 | 75306篇 |
2014年 | 109670篇 |
2013年 | 174851篇 |
2012年 | 110205篇 |
2011年 | 113209篇 |
2010年 | 122034篇 |
2009年 | 124722篇 |
2008年 | 99401篇 |
2007年 | 104848篇 |
2006年 | 114416篇 |
2005年 | 109313篇 |
2004年 | 110653篇 |
2003年 | 100562篇 |
2002年 | 90051篇 |
2001年 | 142530篇 |
2000年 | 136805篇 |
1999年 | 127745篇 |
1998年 | 69373篇 |
1997年 | 66051篇 |
1996年 | 63832篇 |
1995年 | 59259篇 |
1994年 | 53193篇 |
1993年 | 49502篇 |
1992年 | 89939篇 |
1991年 | 85963篇 |
1990年 | 81811篇 |
1989年 | 80262篇 |
1988年 | 73763篇 |
1987年 | 72053篇 |
1986年 | 68087篇 |
1985年 | 67130篇 |
1984年 | 58177篇 |
1983年 | 52161篇 |
1982年 | 44908篇 |
1981年 | 41963篇 |
1980年 | 39516篇 |
1979年 | 48707篇 |
1978年 | 40959篇 |
1977年 | 36658篇 |
1976年 | 33992篇 |
1975年 | 33401篇 |
1974年 | 35514篇 |
1973年 | 34163篇 |
1972年 | 31981篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
H Murakami M Togawa S Takahashi N Kasahara J Yamamoto N Matsuura Y Koshiyama Y Ino M Oda 《Arzneimittel-Forschung》1990,40(12):1352-1358
The effects of FUT-187 (6-amidino-2-naphthyl 4-[(4,5-dihydro-1H-imidazol-2-yl)amino]benzoate dimethanesulfonate, CAS 103926-82-5), a novel synthetic protease inhibitor, were examined in experimental rat and canine models of pancreatitis. 1. FUT-187 significantly increased the survival of rats with trypsin- and phospholipase A2-induced pancreatitis in a dose-dependent manner (10-100 mg/kg, p.o.). 2. FUT-187 decreased plasma enzymatic activity reflecting the degree of pancreatitis in rats with ethionine-induced pancreatitis, and showed a tendency to ameliorate histopathological changes in the pancreas (10-100 mg/kg p.o.). 3. FUT-187 (10 mg/kg) produced an obvious improvement of various biochemical parameters of pancreatitis and also reduced histopathological changes in the pancreas in animals with experimental pancreatitis produced by the closed duodenal loop method. In addition, FUT-187 significantly increased the survival of dogs when given by direct administration into the lumen of the closed duodenal loop. The therapeutic effects of FUT-187 in experimental pancreatitis were nearly equal in most instances to those of camostat mesilate. Thus, FUT-187 would appear to be an effective new agent for the treatment of pancreatitis. 相似文献
992.
Experiments were performed on spinalized rats, transected at the Cl level. The intravenous administration of TRH and its analog YM-14673 (N alpha-[(S)-4-oxo-2-azetidinyl) carbonyl]-L-histidyl-L-prolinamide dehydrate) produced marked increases in the amplitude of mono- and polysynaptic reflex potentials and those of the withdrawal flexor reflexes. The effects of YM-14673 were stronger and longer-lasting than those of TRH. The stimulant action of TRH and YM-14673 on the flexor reflexes was not antagonized by prazosin, chlorpromazine, haloperidol or cyproheptadine, suggesting no involvement of the release of catecholamines or serotonin in the stimulant effects of TRH and its analog. Therefore, YM-14673 may be beneficial for the treatment of several spinal motor neuron diseases. 相似文献
993.
994.
995.
J. Rutenfranz W. Ottmann B. Neidhart W. Brockmann 《International archives of occupational and environmental health》1988,61(1-2):89-93
Summary A typical shiftwork experiment was chosen to prove the validity of an automated procedure for the analysis of free noradrenaline and adrenaline in urine. The method consists of a column switching technique with an adsorption/elution clean-up and a reversed phase high performance liquid chromatography followed by chemical reaction detection based on the trihydroxyindole method. The analysis of variance was performed using a second data set obtained by a semi-automated procedure for which the accuracy had already been confirmed. The analysis of covariance showed that for field studies, as well as for laboratory experiments in which the variances contributed by the experiments themselves are greater than 10% rel., the data sets of the two methods provide the same information.Dedicated to Prof. H. Hartkamp, University of Wuppertal, on the occasion of his 60th birthday 相似文献
996.
Multicentricity of hepatocellular carcinoma (HCC) is considered, especially in patients with liver cirrhosis. This paper describes an operative case of a male patient with probable multicentric development of HCC in precirrhotic fibrosis. The main tumors inside the capsule were completely necrotic due to transarterial embolization (TAE). Histologic examination disclosed discrete tiny nodules of HCC that were not detected grossly. They showed highly differentiated trabecular arrangements: Edmondson I. A scirrhous type was noted in the center of the tumors. At the borders of the tumors the carcinoma cells exhibited replacing growth patterns and it was thought that they developed multicentrically. Partial resection must be performed as extensively as possible in a case such as the present one. 相似文献
997.
A. Taytard J. F. Tessier J. G. Faugere J. Vergeret P. Freour 《European journal of epidemiology》1988,4(3):326-330
Professional exposure to vegetable dusts affect the respiratory function of the exposed subjects. A previous survey conducted in an industrial flour-mill demonstrated a higher frequency of respiratory symptoms in workers compared to a control group. Ten subjects employed in a work site particularly exposed to dust were studied. Each subject answered a questionnaire and performed on Mondays and Fridays, at the begenning and end of his work shift, a flow volume curve and an isocapnic hyperventilation test. The aerobiology of the professional environment was also measured. We noted: 1) in the flow volume curves: a drop in the FEV1 during the Monday morning shift, a significant difference between the FEV1 (p<0.05) and the MMEFR 25–75 (p<0.05) measured at 6 am on Monday and Friday, and between the MMEFR 25–75 values obtained at 12 noon on Monday and Friday (p<0.05). 2) after isocapnic hyperventilation, a significant drop in the MMEFR 25–75 at 6 am on Monday (p<0.01) and in the FEV1 and MMEFR 25–75 at 12 noon on Mondays (p<0.05), a significant drop in the FEV1 at 1 pm on Monday (p<0.01). 相似文献
998.
999.
1000.
LUCAS D.; MENEZ J. F.; BODENEZ P.; BACCINO E.; BARDOU L. G.; FLOCH H. H. 《Alcohol and alcoholism (Oxford, Oxfordshire)》1988,23(1):23-31
Acetaldehyde, the first metabolite of ethanol, reacts with haemoglobinin vitro to produce acetaldehydehaemoglobin adducts.Some clinical studies on the minor haemoglobins have suggestedthat these adducts may be formed in people abusing alcohol.Under hydrolysis of haemoglobin, with oxalic acid at 100°Cin sealed vials, some acetaldehyde was released and then specificallydetermined by HPLC. The kinetics of hydrolysis were studiedusing haemoglobin previously labelled with 14[C] acetaldehyde.The maximum liberation of 14[C] acetaldehyde was obtained after3 hr 30 min hydrolysis and this time factor was then utilizedin the analysis of alcoholic and control haemoglobin. Thus,we have confirmed the formation of acetaldehyde haemoglobinadducts in vivo. It must be noted that the released acetaldehydecorresponds only to an index of the stable adducts. The levelswere higher in alcoholics than in controls (1.417±0.171and 1.295±0.139 nmol/mg Hb, respectively, P<0.001).In conclusion, this marker is not a convenient tool for themonitoring of alcohol exposure levels because of the low differencesbetween alcoholic and control haemoglobins. 相似文献