全文获取类型
收费全文 | 23642篇 |
免费 | 1111篇 |
国内免费 | 117篇 |
专业分类
耳鼻咽喉 | 329篇 |
儿科学 | 359篇 |
妇产科学 | 477篇 |
基础医学 | 2932篇 |
口腔科学 | 606篇 |
临床医学 | 1756篇 |
内科学 | 6431篇 |
皮肤病学 | 265篇 |
神经病学 | 1869篇 |
特种医学 | 766篇 |
外科学 | 3991篇 |
综合类 | 109篇 |
一般理论 | 1篇 |
预防医学 | 695篇 |
眼科学 | 344篇 |
药学 | 1612篇 |
中国医学 | 43篇 |
肿瘤学 | 2285篇 |
出版年
2022年 | 211篇 |
2021年 | 398篇 |
2020年 | 235篇 |
2019年 | 270篇 |
2018年 | 390篇 |
2017年 | 299篇 |
2016年 | 364篇 |
2015年 | 372篇 |
2014年 | 521篇 |
2013年 | 640篇 |
2012年 | 987篇 |
2011年 | 1062篇 |
2010年 | 578篇 |
2009年 | 530篇 |
2008年 | 1045篇 |
2007年 | 1103篇 |
2006年 | 1072篇 |
2005年 | 987篇 |
2004年 | 1002篇 |
2003年 | 988篇 |
2002年 | 1010篇 |
2001年 | 891篇 |
2000年 | 932篇 |
1999年 | 798篇 |
1998年 | 296篇 |
1997年 | 214篇 |
1996年 | 196篇 |
1995年 | 180篇 |
1994年 | 157篇 |
1993年 | 139篇 |
1992年 | 599篇 |
1991年 | 624篇 |
1990年 | 532篇 |
1989年 | 540篇 |
1988年 | 521篇 |
1987年 | 498篇 |
1986年 | 426篇 |
1985年 | 430篇 |
1984年 | 316篇 |
1983年 | 239篇 |
1979年 | 232篇 |
1978年 | 132篇 |
1977年 | 136篇 |
1974年 | 129篇 |
1973年 | 119篇 |
1972年 | 137篇 |
1971年 | 127篇 |
1970年 | 114篇 |
1969年 | 137篇 |
1967年 | 128篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
43.
44.
Isao Fukunishi MD Satoru Saito MD Keizo Fujito PhD 《Child psychiatry and human development》1992,22(3):213-220
Investigation of the Type A Behavior Pattern (TABP) of pre-school children was conducted to determine the influence of the mother-child relationship on the development of TABP. The incidence of TABP was 44.2% (51.7% in boys and 38.7% in girls). The TABP tendency of the boys decreased as the manifest dissension or conflict in the family grew, in marked contrast with the tendency seen in girls, suggesting that conflict in the family can either weaken or reinforce TABP. 相似文献
45.
46.
A Kamiya Y Tanigawara Y Saito Y Hayashi T Aiba K Inui R Hori 《Journal of pharmaceutical sciences》1990,79(8):692-697
Effects of urine pH on the renal tubular secretion of an organic cation (tetraethylammonium, TEA) and an organic anion (p-aminohippurate, PAH) were investigated using the isolated erythrocyte-perfused rat kidney. The method was based on a multiple indicator dilution experiment and noncompartmental moment analysis. Treatment with sodium bicarbonate and sodium dihydrogen phosphate increased and decreased urine pH, respectively, but affected neither the condition of the perfused kidney nor the renal handling of albumin and inulin. In TEA studies, the increase of urine pH prolonged the mean residence time in renal epithelial cells (T cell) and reduced the apparent secretion intrinsic clearance, but did not influence the volume of distribution in the kidney (Vd drug). The decrease of urine pH did not affect these kinetic parameters. By contrast, PAH secretion was constant against the change of urine pH. Since any change in the basolateral membrane transport is reflected in Vd drug, the net transport from blood to cells can be regarded as similar under these treatments. On the other hand, the prolonged T cell of TEA with the increased urine pH suggested a slow transport from cells to lumen across the brush-border membranes. The present results coincide with the hypothetical mechanism that organic cations are secreted via an active transport system, coupled to the countertransport of H+ into cells. In conclusion, the present method is useful to separately evaluate the transmembrane transport across both sides of the renal epithelial cells in a morphologically intact kidney. 相似文献
47.
T Hayashi M Ozaki I Mori M Saito T Itoh H Yamamoto 《International journal of experimental pathology》1992,73(2):173-181
The lactic dehydrogenase (LDH) level in plasma and the clearance of LDH in C.B-17 scid (severe combined immunodeficiency; SCID) mice were compared with those in C.B-17 or BALB/cCrSlc mice with or without lactic dehydrogenase virus (LDV) infection. The resting enzyme level in SCID mice showed little difference from that in C.B-17 or BALB/cCrSlc mice. The degree of increased plasma LDH level in SCID mice was lower than that in C.B-17 and BALB/cCrSlc mice after LDV infection. To assess the mechanisms of decrease in LDH elevation in SCID mice infected with LDV, virus replication was compared in SCID and BALB/cCrSlc mice. The infectivity titre of plasma in SCID mice was higher (more than 10 times) than that in BALB/cCrSlc mice. Moreover, the percentage of virus antigen positive Kupffer cells was higher in SCID mice than that in BALB/cCrSlc mice. The level of endogenous LDH release as a result of carbon tetrachloride treatment was similar in the SCID and BALB/cCrSlc mice. The clearance rate of endogenous LDH was greater in SCID mice than in BALB/cCrSlc mice with or without LDV infection. The rate of clearance of intravenously injected porcine LDH-5, but not porcine LDH-1, was enhanced in SCID mice as compared with that in BALB/cCrSlc mice. Furthermore, carbon clearance was higher in SCID mice than that in BALB/cCrSlc mice. These results suggest that the smaller increase of plasma LDH after infection might be due, at least in part, to the enhanced LDH-5 clearance function by macrophages in SCID mice. 相似文献
48.
49.
Whether or not compromised host defense prior to surgical treatment is related to development of infection with methicillin-resistant staphylococcus aureus (MRSA) following major surgery was examined. Of 22 patients undergoing esophagectomy for cancer between 1989 and 1990, 5 were free from MRSA colonization and infection (group I) while 8 had MRSA colonization without infection (group II) and 9 had MRSA infection (group III). Levels of neutrophil cytocidal functions, complements, immunoglobulins and cell-mediated immunity were not significantly different among these three groups. The mean of anti pneumococcal polysaccharide (PPS)-IgG was significantly lower in group III than in group I (p < 0.05) and tended to be lower than in group II (P = 0.08). All infected patients showed a titer < 600 EU while all but one non-infected patient did so > 600 EU. Serum IgG2 levels positively correlated with anti-PSS IgG levels. Thus, we concluded that a preoperative evaluation of antibody response against polysaccharides and serum IgG2 levels can serve to predict development of MRSA-related infection following esophageal surgery. 相似文献
50.
A case of subacute idiopathic pure pan-dysautonomia--recovery with prednisolone therapy 总被引:1,自引:0,他引:1
A 52-year-old man had, after an episode of fever in June 1989, developed orthostatic dizziness followed by sexual impotence, dysuria, decreased sweating and weight-loss, which progressed gradually and reached their maximum seven months after the onset. He was given 400 mg of droxydopa and 8 mg of midodrine HCL per day without apparent benefits, and was admitted to our hospital. His blood pressure (mmHg) and heart rate were 167/102 and 68 in supine position, and 74/41 and 62 in sitting position. Skin was dry. Pupillary reactions were sluggish. Left pupil was slightly irregular. Other cranial nerves, sensory and somatic motor functions were normal. Laboratory tests revealed as follows: slight anemia, ESR 42 mm/hour, serum IgG 2236 mg/dl, CSF protein 64 mg/dl and positive tests for non-specific autoantibodies. Nerve conduction studies and electromyogram were normal. Autonomic function tests showed postganglionic impairments of sympathetic and parasympathetic systems. The sural nerve biopsy disclosed normal myelinated fibers, but decreased unmyelinated fiber density to 60% of the control value. No demyelinating lesions, cell infiltration or amyloid deposits were seen. Under the diagnosis of idiopathic pure pan-dysautonomia, prednisolone, initially 60 mg daily, was added. Within 10 days, he showed marked improvement of general conditions. No exacerbation was seen during reduction or after withdrawal of prednisolone. Repeated tests showed normalizing laboratory data and regression of autonomic deficits. A year after onset he regained normal social life.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献