全文获取类型
收费全文 | 3374篇 |
免费 | 177篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 49篇 |
儿科学 | 64篇 |
妇产科学 | 32篇 |
基础医学 | 371篇 |
口腔科学 | 56篇 |
临床医学 | 191篇 |
内科学 | 856篇 |
皮肤病学 | 59篇 |
神经病学 | 278篇 |
特种医学 | 122篇 |
外科学 | 521篇 |
综合类 | 19篇 |
预防医学 | 96篇 |
眼科学 | 25篇 |
药学 | 266篇 |
中国医学 | 3篇 |
肿瘤学 | 554篇 |
出版年
2023年 | 23篇 |
2022年 | 45篇 |
2021年 | 91篇 |
2020年 | 66篇 |
2019年 | 60篇 |
2018年 | 61篇 |
2017年 | 71篇 |
2016年 | 79篇 |
2015年 | 84篇 |
2014年 | 85篇 |
2013年 | 98篇 |
2012年 | 152篇 |
2011年 | 190篇 |
2010年 | 87篇 |
2009年 | 97篇 |
2008年 | 150篇 |
2007年 | 135篇 |
2006年 | 153篇 |
2005年 | 132篇 |
2004年 | 137篇 |
2003年 | 134篇 |
2002年 | 136篇 |
2001年 | 146篇 |
2000年 | 136篇 |
1999年 | 136篇 |
1998年 | 25篇 |
1997年 | 37篇 |
1996年 | 26篇 |
1995年 | 25篇 |
1994年 | 22篇 |
1993年 | 22篇 |
1992年 | 71篇 |
1991年 | 50篇 |
1990年 | 71篇 |
1989年 | 73篇 |
1988年 | 76篇 |
1987年 | 55篇 |
1986年 | 49篇 |
1985年 | 49篇 |
1984年 | 27篇 |
1983年 | 39篇 |
1981年 | 14篇 |
1979年 | 25篇 |
1977年 | 9篇 |
1974年 | 13篇 |
1972年 | 12篇 |
1969年 | 12篇 |
1968年 | 10篇 |
1967年 | 9篇 |
1966年 | 8篇 |
排序方式: 共有3562条查询结果,搜索用时 15 毫秒
1.
2.
Yuichiro Nakai MD DMSc Takeshi Maeda MD Junko Nishio MD DMSc Daisuke Tachibana MD Motoharu Imanaka MD DMSc Sachio Ogita MD DMSc 《The Australian & New Zealand journal of obstetrics & gynaecology》1998,38(4):469-471
EDITORIAL COMMENT: We accepted this case for publication to remind readers that although uterine rupture during labour in a primigravida is extremely uncommon it does occur, or at any rate nulliparas can develop abdominal pain and shock in labour with a haemoperitoneum resulting from a tear in a vein in the lower posterior uterine wall. When one sees the hugely dilated uterine and ovarian venous plexuses at Caesarean section it is easy to believe that bleeding from such a vessel during labour could be prodigious. This case suggests that a dilated vein with blood flow derangements may be the cause. Nonetheless, as the authors warn us, the necessary response is not a precise diagnosis, but rapid laparotomy. See also Editorial Comment to Chin MMS, Harvey JA, Duffy BL. Uterine rupture during labour in a primigravida. Aust NZ J Obstet Gynaecol 1996; 36: 210. 相似文献
3.
S Wada R Yasumoto T Kishimoto M Maekawa M Harima S Nishio 《Hinyokika kiyo. Acta urologica Japonica》1991,37(11):1441-1445
Transrectal hyperthermia was performed on 30 patients with benign prostatic hyperplasia twice a week for a total of ten times with the temperature of the prostatic tissue set at 43.0 degrees C. In our in vitro experiment using an agar phantom, the highest temperature was observed at approx. 1.5 cm from the point where the 915-MHz microwave was generated. Our histopathological study of the prostatic tissue, resected at open surgery after three days of hyperthermia, indicated that the effect of hyperthermia first occurred in the interstitial tissues, and then extended to the epithelial cells. Subjective symptoms and objective findings were evaluated. In almost all cases, improvement was observed in subjective symptoms after completion of the treatment. The residual urine volume improved significantly. Also, significant improvement was observed in our urodynamics study. In 16 out of 30 cases (53%), both subjective symptoms and objective findings were still improved after six months. 相似文献
4.
Toshio Imanishi Mikio Arita Yoshiaki Tomobuchi Masanori Hamada Takuzo Hano Ichiro Nishio 《Clinical and experimental pharmacology & physiology》1997,24(11):800-806
1. This study was undertaken to evaluate the preventive effects of locally administered argatroban, a competitive inhibitor of thrombin-induced platelet activation, on restenosis after balloon angioplasty. 2. A hydrogel-coated balloon catheter was immersed three times in argatroban/saline solution (1 mg/mL) for 60 s, inflated to a pressure of 606 kPa and left in the rabbit common carotid artery for 1 min. The same procedure was performed, without drug, as a control. The pharmacokinetics of delivered argatroban in the arterial wall were assessed using [14C]-argatroban. Platelet deposition 2h after balloon injury was quantified by fluorescence studies using antiplatelet antibody. Vascular smooth muscle cell (VSMC) proliferation 3 days after balloon injury was assessed by immunohistochemical staining for proliferative cell nuclear antigen (PCNA). In a clinical study, we divided 50 elective patients into two groups: argatroban and control. 3. In the experimental study, the mean quantities of argatroban at 0, 2 and 6 h after deflation wer. 24.63, 0.49 and 0.11 nmol/g wet weight of artery, respectively. Argatroban was undetected 24 h after deflation. Two hours after deflation, argatroban-treated arteries showed less platelet adhesion than saline-treated controls. The mean number of PCNA-positive cells was 16.9 and 43.8% in the argatroban and control groups, respectively (P < 0.01). In the clinical study, the mean late gain loss was 8.2 and 27.3% in the argatroban and control groups, respectively (P < 0.05). The mean late restenosis rate was 11.1 and 41.4% in the argatroban and control groups, respectively (P<0.05). 4. These data suggest that blood coagulation plays a significant role in VSMC proliferation after balloon injury and that locally administered argatroban using hydrogel-coated balloon catheter may prevent post-percutaneous transluminal coronary angioplast. restenosis. 相似文献
5.
Kazushi Tsuda Keizo Kimura Hiroki Shima Ichiro Nishio Yoshiaki Masuyama 《Clinical and experimental pharmacology & physiology》1992,19(7):531-535
The present study was designed to investigate the presynaptic alpha 2-adrenoceptor function to inhibit norepinephrine (NE) release in blood vessels of reduced renal mass salt hypertensive rats (Na-loaded HT). Isolated perfused mesenteric vasculatures were prepared from Na-loaded HT and normotensive control rats (NT-control), and the NE release and vascular responsiveness were examined. Periarterial nerve stimulation caused a significantly greater release of NE and pressor responses in Na-loaded HT than in NT-control. Yohimbine, a potent alpha 2-adrenoceptor antagonist, demonstrated the facilitatory effects on NE release during nerve stimulation. The effects were significantly attenuated in Na-loaded HT compared with NT-control. These results demonstrate that vascular sympathetic nervous activity might be enhanced in Na-loaded HT. Furthermore, the increased NE release from vascular adrenergic neurons in Na-loaded HT could partially depend on impaired presynaptic alpha 2-adrenoceptor-mediated modulation, which might contribute to the pathogenesis and maintenance of this form of salt-dependent hypertension. 相似文献
6.
A Sakai T Hori T Okuda T Matsubara K Saitoh M Yajima S Nishio 《Japanese journal of pharmacology》1989,51(3):450-454
TRK-100 (0.03, 0.1 and 0.3 mg/kg, p.o.), a chemically stable analogue of prostacyclin, dose-dependently prevented blood coagulation and glomerular fibrin deposition which were enhanced by 4 hr infusion of endotoxin (100 mg/kg) in rats. In addition, TRK-100 suppressed the generation of endotoxin-induced tissue thromboplastin like activity in cultured human endothelial cells. 相似文献
7.
Hideyuki Iwai Ryuji Koike Jun Ogawa Takahiko Sugihara Hiroyuki Hagiyama Kenji Nagasaka Yoshinori Nonomura Junko Nishio Toshihiro Nanki Rieko Tsubata Hitoshi Kohsaka Tetsuo Kubota Nobuyuki Miyasaka 《Nihon Rinshō Men'eki Gakkai kaishi》2002,25(3):270-276
A 36-year-old man was admitted to a hospital with complaints of fever, polyarthralgia and dyspnea. Erythema was observed on his face, extensor surface of the fingers and extremities, and a chest X-ray revealed massive bilateral pleural effusion. He had no sign of myopathy at this point. Pleural fluid was proved to be exudative and contained extremely high levels of hyaluronic acid. He was also complicated with interstitial pneumonitis and was given a pulse therapy with methyl prednisolone followed by daily administration of 55 mg prednisolone (PSL). Twenty days after the commencement of the therapy, pleural effusion decreased but muscle weakness gradually appeared, accompanied by elevation of myogenic enzymes. Myogenic changes on electromyogram, and irregularity of the muscle fibers with slight inflammatory cell infiltrates in a biopsy specimen were demonstrated. He was transferred to our hospital, and a diagnosis of dermatomyositis was made. Later, pleural effusion waxed and waned depending on the dosage of PSL, but no other causative disorder was demonstrated by extensive examinations. This case indicates that the pleuritis could be one of the vasculitic manifestations of dermatomyositis. 相似文献
8.
Crystal-matrix interrelations in brushite and uric acid calculi 总被引:1,自引:0,他引:1
Brushite and uric acid calculi were studied by means of scanning electron microscopy with the partial dissolution method and transmission electron microscopy. Brushite calculi consist of radially oriented columnar crystals which have sheet-like substructure. The organic matrix is identified chiefly at the outside of the crystals but partly included between the substructure. The concentric matrix bands are often dislocated between the neighbouring crystals. Uric acid calculi also consist of radially oriented columnar crystals, and a fine meshwork of the organic matrix is incorporated within the crystals. The concentric matrix layers of different density are angled according to the crystal lattice. These findings indicate that the organic matrix arose from a mucinous surface coat, at least in the radially striated calculi. The crystals continued to grow in this gel-state milieu, either thrusting the matrix aside or incorporating it within the crystals. 相似文献
9.
Hiromi Oono Masae Nakagawa Atsushi Miyamoto Shigeru Ishiguro Akira Nishio 《Magnesium research》2002,15(3-4):153-160
We have previously shown that interleukin (IL)-1beta and tumour necrosis factor (TNF)-alpha mRNA levels in rat alveolar macrophages are increased in by endotoxin (lipopolysaccharide; LPS)- stimulation and further enhanced by culturing with low-Mg2+ medium. We have now investigated the mechanisms of underlying this enhancement by using some specific signal transduction inhibitors. The enhanced elevation of both mRNAs levels was suppressed by pretreatment with TMB-8 (which inhibits calcium release from the endoplasmic reticulum) or dexamethasone (which inhibits nuclear factor [NF]-kappaB and activator protein [AP]-1), but not with verapamil or nifedipine (which inhibits calcium channels). The enhancment of IL-1beta, but not TNF-alpha mRNA levels, was suppressed by pretreatment with W-7 (which inhibits calmodulin), whereas the enhancement of TNF-alpha mRNA levels was suppressed by pretreatment with U73122 (which inhibits phospholipase C). Curcumin (an inhibitor of AP-1), suppressed the increases in both mRNAs induced by low-Mg2+ medium alone, but had no suppressive effect on the levels of either mRNA after LPS-stimulation in low-Mg2+ medium. Pyrrolidine dithiocarbamate (an inhibitor of NF-kappaB) prevented the elevation of TNF-alpha mRNA levels induced by low-Mg2+ medium without LPS-stimulation, but had no suppressive effect on IL-1beta mRNA levels. From these results, we conclude that the enhanced elevation of IL-1beta and TNF-alpha mRNA levels seen in LPS-stimulated alveolar macrophages in low-Mg2+ medium occurs partly via the same, and partly via different, signaling pathways. 相似文献
10.
Hiroki Sakamoto Masayuki Kitano Takeshi Nishio Yoshifumi Takeyama Chikao Yasuda Masatoshi Kudo 《Digestive endoscopy》2006,18(3):206-211
Endosonography‐guided celiac plexus neurolysis (EUS‐CPN) safely and effectively relieves pain associated with intra‐abdominal malignancies when the neurolytic is accurately injected. We applied contrast medium to evaluate the ethanol injection sites in patients who received EUS‐CPN due to abdominal pain caused by malignancies. We injected, under the guidance of endoscopic ultrasonography (EUS), ethanol containing 10% contrast medium into the celiac plexus of patients with intra‐abdominal pain due to malignancies. Immediately after the endoscopic therapy, patients underwent computed tomography (CT) to confirm the injection site. Images of distribution of injected solutions were classified into three groups. Injected solution dispersed in unilateral and bilateral anterocrural space was defined as ‘unilateral injection’ or ‘bilateral injection’, respectively. Injected solution located out of the anterocrural space was defined as ‘inappropriate injection’. Pre‐ and postprocedure pain was assessed using a standard analog scale. Before and 2, 4, 8, 12, and 16 weeks after the procedure, pain scores were evaluated. From April 2003 to May 2005, 13 patients were enrolled in this study. Improvement of pain score in the ‘bilateral injection’ and ‘unilateral injection’ groups was significantly superior to the change in the ‘inappropriate injection’ group. Although EUS‐CPN was effective in eight of 13 patients (61.5%), additional EUS‐CPN to the ‘inappropriate injection group’ increased the response rate to 84.6%. Injection of ethanol to the anterocrural space by EUS‐CPN produced adequate pain relief. Immediate examination by CT for confirmation of injection sites after EUS‐CPN would increase the likelihood of induction of pain relief. 相似文献