全文获取类型
收费全文 | 4825篇 |
免费 | 215篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 41篇 |
儿科学 | 97篇 |
妇产科学 | 60篇 |
基础医学 | 598篇 |
口腔科学 | 176篇 |
临床医学 | 285篇 |
内科学 | 1187篇 |
皮肤病学 | 93篇 |
神经病学 | 315篇 |
特种医学 | 187篇 |
外科学 | 819篇 |
综合类 | 22篇 |
一般理论 | 1篇 |
预防医学 | 117篇 |
眼科学 | 20篇 |
药学 | 353篇 |
中国医学 | 6篇 |
肿瘤学 | 680篇 |
出版年
2023年 | 28篇 |
2022年 | 50篇 |
2021年 | 104篇 |
2020年 | 44篇 |
2019年 | 50篇 |
2018年 | 92篇 |
2017年 | 60篇 |
2016年 | 62篇 |
2015年 | 86篇 |
2014年 | 121篇 |
2013年 | 144篇 |
2012年 | 231篇 |
2011年 | 233篇 |
2010年 | 129篇 |
2009年 | 116篇 |
2008年 | 253篇 |
2007年 | 224篇 |
2006年 | 210篇 |
2005年 | 259篇 |
2004年 | 247篇 |
2003年 | 244篇 |
2002年 | 232篇 |
2001年 | 122篇 |
2000年 | 141篇 |
1999年 | 125篇 |
1998年 | 79篇 |
1997年 | 60篇 |
1996年 | 59篇 |
1995年 | 59篇 |
1994年 | 64篇 |
1993年 | 44篇 |
1992年 | 108篇 |
1991年 | 100篇 |
1990年 | 88篇 |
1989年 | 81篇 |
1988年 | 99篇 |
1987年 | 64篇 |
1986年 | 72篇 |
1985年 | 73篇 |
1984年 | 42篇 |
1983年 | 56篇 |
1981年 | 22篇 |
1979年 | 30篇 |
1977年 | 20篇 |
1975年 | 16篇 |
1974年 | 16篇 |
1973年 | 18篇 |
1972年 | 20篇 |
1970年 | 16篇 |
1967年 | 19篇 |
排序方式: 共有5057条查询结果,搜索用时 15 毫秒
51.
Expression of BAFF-R (BR3) in normal and neoplastic lymphoid tissues characterized with a newly developed monoclonal antibody 总被引:4,自引:0,他引:4
Nakamura N Hase H Sakurai D Yoshida S Abe M Tsukada N Takizawa J Aoki S Kojima M Nakamura S Kobata T 《Virchows Archiv : an international journal of pathology》2005,447(1):53-60
BAFF-receptor (BAFF-R) is required for the successful maturation and survival of B-cells. We developed an anti-human BAFF-R monoclonal antibody (mAb), 8A7. The reactivity of 8A7 in normal and neoplastic tissue was examined by performing immunohistochemistry on paraffin-embedded sections. 8A7 reacted with lymphocytes in the mantle and marginal zones, but not with lymphocytes in the interfollicular area. Lymphocytes in the germinal centers were found to be negative or occasionally weakly positive for 8A7. BAFF-R expression was found only in B-cell lymphoma (44/80, positive cases/examined cases): B-lymphoblastic lymphoma 0/3, B-chronic lymphocytic leukemia/small lymphocytic lymphoma 4/4, mantle cell lymphoma 9/11, follicular lymphoma 10/14, diffuse large B-cell lymphoma (DLBCL) 11/25, marginal zone B-cell lymphoma 8/10, lymphoplasmacytic lymphoma 2/2, plasma cell myeloma 0/2, and Burkitt lymphoma 0/9, but not in T/NK cell lymphomas (0/19) or Hodgkin lymphoma (0/10). BAFF-R was expressed in most low-grade B-cell neoplasms and a small number of DLBCL, suggesting that BAFF-R may play an important role in the proliferation of neoplastic lymphoid cells. Thus, the mAb is very useful for further understanding of both healthy B-cell biology and its pathogenic neoplasms. 相似文献
52.
Naoki Horikawa Tomoyuki Suzuki Takaoki Uchiumi Tetsuji Minamimura Kazuhiro Tsukada Noriaki Takeguchi Hideki Sakai 《The Journal of physiology》2005,562(3):885-897
Increased release of thromboxane A2 (TXA2 ) has been shown to be involved in inflammatory bowel diseases. In the present study, we have investigated the effect of a stable TXA2 analogue (STA2 ) on the electrical parameters in isolated human colonic mucosa. In the human mucosa set between Ussing chambers, STA2 stimulated Cl− secretion in a concentration-dependent manner with an EC50 of 0.06 μ m . The STA2 -induced Cl− secretion was significantly inhibited by ONO-3708 (10 μ m ), a specific TXA2 receptor antagonist. The effect of STA2 (0.3 μ m ) was independent of the colonic segment from which the tissue was obtained, from caecum to rectum. Chromanol 293B, an inhibitor of the cAMP-dependent KvLQT1 channel, attenuated the STA2 -induced Cl− secretion in the human colonic mucosa (IC50 value 1.18 μ m ). We found that KvLQT1 mRNA and protein were expressed in all the tested segments of the human colon. The STA2 -induced Cl− secretion was significantly inhibited by 8-bromo-2'-monobutyryladenosine-3',5'-cyclic monophosphorothioate (50 μ m ), a membrane-permeant cAMP antagonist. STA2 (0.3 μ m ) significantly increased the intracellular cAMP levels and the short-circuit current via TXA2 receptor in a human colonic cell line. These results suggest that the TXA2 -induced Cl− secretion in the colon is mediated via the cAMP pathway in addition to the Ca2+ –calmodulin pathway which was previously reported. 相似文献
53.
Differential expression of decorin and biglycan genes during palatogenesis in normal and retinoic acid-treated mice. 总被引:1,自引:0,他引:1
Yuxiang Zhang Tetsuji Mori Ken Iseki Seita Hagino Hiromi Takaki Mayumi Takeuchi Tsuyoshi Hikake Choichiro Tase Masahiro Murakawa Sachihiko Yokoya Akio Wanaka 《Developmental dynamics》2003,226(4):618-626
Proteoglycans are involved in secondary palate formation. In the present study, we focused on two small leucine-rich proteoglycans, decorin and biglycan, because they assembled extracellular matrix molecules such as collagens and modulated signaling pathway of transforming growth factor-beta. To investigate the functions of decorin and biglycan in palatogenesis, we compared their mRNA expression patterns between normal palate and retinoic acid-induced cleft palate in mice by using in situ hybridization analysis during the period of embryonic day 13.5 (E13.5) to E15.5. On E13.5, decorin mRNA was expressed in the epithelia and mesenchyme on the nasal side of the developing secondary palate. During the period the palate shelves were fusing (E14.5), decorin mRNA was strongly expressed in the mesenchyme but its expression pattern was asymmetric; decorin mRNA expression area in the nasal side was broader than that in the oral side. The expression of decorin mRNA was hardly detected in the mesenchyme on either side of the medial edge epithelium. After fusion (E15.5), its expression converged to the mesenchyme just around the palatine bone. Biglycan mRNA was ubiquitously distributed throughout the palatal mesenchyme for the mid-gestation period. Its expression area became limited to the ossification area within the palate after the late gestation period. In the retinoic acid-treated mice, the area of the decorin gene expression expanded to the core region of the palate primordium where little signal was observed in control mice. On the other hand, biglycan in the retinoic acid-treated mice did not show remarkable change in its distribution patterns compared with that in the control mice. These findings suggest that decorin and biglycan play distinct roles in palatogenesis, and decorin was more actively involved in the process of secondary palate formation than biglycan. Up-regulation of decorin gene expression in the retinoic acid-treated mice might influence the pathogenesis of cleft palate. 相似文献
54.
Monteiro GC Hirata R Andrade AF Mattos-Guaraldi AL Nagao PE 《International journal of molecular medicine》2004,13(1):175-180
Mononuclear cells have been found to play a key role in phagocytosis and eventual killing of group B streptococci (GBS). The rich array of sugars on bacterial surface plus the presence of membrane-associated lectin-receptors on the macrophage suggests that this is a likely means for GBS recognition by these host defense cells. Macrophages have been shown to bind GBS in the absence of serum components. However, participation of carbohydrate moieties in GBS intracellular survival had not been completely elucidated. The aim of this study was to assess the involvement of sugars on adherence and intracellular viability in murine macrophages of GBS serotypes Ia (85147 and 90222 strains), III (80340 and 90356 strains) and V (88641 and 90186 strains) isolated from assymptomatic carriers and patients, respectively. Most isolates showed higher adherence within 2-h incubation. Only 90222-Ia strain exhibited progressive adherence rate until 12-h incubation. All strains showed intracellular viability during first 0.5-h of incubation. Except for 90186-V strain that survived only for 2 h, strains of all serotypes tested were found to survive 24 h into macrophages. Treatments of bacteria by glycosidases inhibited macrophage interaction with GBS strains at varied levels. Neuraminidase inhibited 90-97% adherence and 100% intracellular survival of GBS strains (P<0.0001). Host cell treatments with Rhamnose, N-acetyl-D-glucosaminidase and Fucose (5 mg/ml) inhibited adherence and intracellular viability of GBS strains at varied levels. Removal of GlcNAc residues of invasive GBS isolates enhanced intracellular viability, suggesting that GlcNAc residues may act by intercepting the expression of hidden receptors probably related with invasiveness and survival within macrophages. Lastly, our results demonstrate involvement of sialic acid specific receptors on macrophages and lectinophagocytosis in non-opsonic interaction and survival of GBS invasive isolates. 相似文献
55.
56.
Chiaki Watanabe Makiko Kuwagata Shinsuke Yoshimura Jiro Azegami Kouichi Kojima Hiroshi Ono Tetsuji Nagao 《Clinical genetics》2003,43(3):177-179
ABSTRACT The technique for gavage administration to rat nurslings was improved to allow determination of the direct effects of chemical substances in the nurslings. Rat neonates were treated with distilled water from postnatal day 1 through 20 using this technique. The viability of neonates during the administration period was comparable to that of untreated neonates. No adverse effects of this technique on the development of neonates were found, and no histological alterations of the esophagus or pharynx. Therefore, we conclude that use of our improved gavage administration method will contribute to ensuring successful neonatal development and thus allowing accurate assessment of the toxicological effects of test compounds on rat nurslings. 相似文献
57.
58.
Preferential expression of T(h)2-type chemokine and its receptor in atopic dermatitis 总被引:1,自引:0,他引:1
Lesional skin of patients with atopic dermatitis (AD) is histologically characterized by hypertrophy of the skin, and the infiltration of a large number of eosinophils and T cells into the dermis. Recent studies have indicated that Th2 cells play a crucial role in the pathogenesis of AD skin. Chemokines and their receptors are implicated in the development of symptoms of various skin diseases such as AD and psoriasis vulgaris (psoriasis). We have examined the in situ expression of a typical Th2-type chemokine, thymus- and activation-regulated chemokine (TARC), and its receptor (CCR4) using immunohistochemical techniques. TARC was found to be highly expressed in the basal epidermis of the lesional skin of AD patients and only slightly in the non-lesional skin. On the other hand, no positive cells were seen in the lesional skin of psoriasis. Consistently, CCR4+ cells were present predominantly in the lesional skin of AD patients, but not in the non-lesional skin. In contrast, in the lesional skin of psoriasis patients, cells positive for CCR5, which is expressed on Th1 cells, were abundantly present. Interestingly, psoralen plus ultraviolet A therapy reduced the number of CCR4+ cells in the AD skin lesions. These results suggest that Th2-type cytokines such as TARC are involved in the pathogenesis of skin lesions in AD patients through the preferential recruitment of Th2 cells. 相似文献
59.
Gastric motility in patients with recurrent gastric ulcers. 总被引:3,自引:0,他引:3
Takeshi Kamiya Yuka Kobayashi Makoto Hirako Naoko Misu Toshihiro Nagao Michiko Hara Eriko Matsuhisa Takashi Ando Hiroshi Adachi Nagahiko Sakuma Genjiro Kimura 《Journal of Smooth Muscle Research》2002,38(1-2):1-9
The existence of abnormal gastric motility in gastric ulcer disease remains controversial. The aim of this study was to characterize gastric motility in patients with recurrent gastric ulcers. Studies were performed in 10 control subjects and in 24 patients with recurrent active gastric ulcer disease as diagnosed by gastrointestinal endoscopy. Gastric motility was evaluated by cutaneous electrogastrography (EGG) and by gastric semi-liquid meal emptying. The EGG was recorded before and after ingestion of a test meal containing 20 mg/kg of acetaminophen. Patients with a dominant EGG frequency of greater than 0.06 Hz were defined as tachygastria, while those with a frequency of less than 0.04 Hz were defined as bradygastria. A transient frequency decrease, called postprandial dip (PD), was identified visually. The degree of gastric emptying was determined from the serum acetaminophen concentration 45 minutes after the meal. Control subjects showed no irregularity in their dominant EGG frequency in tither fasting or postprandial states. PD was observed in 8 control subjects. In patients presenting with active gastric ulcers, abnormal patterns in the dominant EGG frequency (either as tachygastria or bradygastria) were observed in 14 of the 24 patients when fasting and in 15 of them in the postprandial state. After successful treatment, the number of patients with abnormal patterns in their dominant EGG frequency remained unchanged, while PD was observed in 11 patients. No significant difference was observed in the EGG power ratio as a result of successful treatment. Gastric emptying was significantly delayed compared with controls in both the active and healed stages. These findings suggest that abnormal gastric motility, including gastric electrical abnormalities and delayed gastric emptying, plays an important role in the pathophysiology of recurrent gastric ulcers. 相似文献
60.