全文获取类型
收费全文 | 28400篇 |
免费 | 1331篇 |
国内免费 | 229篇 |
专业分类
耳鼻咽喉 | 210篇 |
儿科学 | 695篇 |
妇产科学 | 218篇 |
基础医学 | 3646篇 |
口腔科学 | 651篇 |
临床医学 | 1718篇 |
内科学 | 7695篇 |
皮肤病学 | 511篇 |
神经病学 | 2028篇 |
特种医学 | 1118篇 |
外科学 | 5064篇 |
综合类 | 115篇 |
预防医学 | 678篇 |
眼科学 | 390篇 |
药学 | 1686篇 |
中国医学 | 46篇 |
肿瘤学 | 3491篇 |
出版年
2023年 | 197篇 |
2022年 | 385篇 |
2021年 | 679篇 |
2020年 | 342篇 |
2019年 | 526篇 |
2018年 | 676篇 |
2017年 | 527篇 |
2016年 | 685篇 |
2015年 | 698篇 |
2014年 | 963篇 |
2013年 | 1090篇 |
2012年 | 1701篇 |
2011年 | 1911篇 |
2010年 | 1101篇 |
2009年 | 928篇 |
2008年 | 1587篇 |
2007年 | 1819篇 |
2006年 | 1812篇 |
2005年 | 1804篇 |
2004年 | 1756篇 |
2003年 | 1677篇 |
2002年 | 1647篇 |
2001年 | 475篇 |
2000年 | 399篇 |
1999年 | 425篇 |
1998年 | 394篇 |
1997年 | 305篇 |
1996年 | 293篇 |
1995年 | 243篇 |
1994年 | 215篇 |
1993年 | 208篇 |
1992年 | 250篇 |
1991年 | 224篇 |
1990年 | 207篇 |
1989年 | 200篇 |
1988年 | 167篇 |
1987年 | 142篇 |
1986年 | 134篇 |
1985年 | 122篇 |
1984年 | 120篇 |
1983年 | 95篇 |
1982年 | 68篇 |
1981年 | 64篇 |
1980年 | 47篇 |
1979年 | 82篇 |
1978年 | 55篇 |
1977年 | 48篇 |
1973年 | 46篇 |
1968年 | 41篇 |
1967年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Hiroyuki Sakai Masaki Ibe Hidetoshi Takahashi Shinobu Matsuo Kensaku Okamoto Isao Makino Yukio Oomori Hajime Iizuka 《The Journal of dermatology》1996,23(1):42-46
Langerhans cell histiocytosis is currently regarded as a reactive proliferative process of Langerhans cells rather than a malignancy. The disease is characterized by Langerhans cell infiltration of skin, lung, bone and other organs. We report a 74-year-old man with Langerhans cell histiocytosis who had generalized hemorrhagic and crusted papules. He also had diabetes insipidus. Because he did not have any severe constitutional symptoms or failure of vital organs, we applied topical PUVA treatment to his skin lesions, which responded well to the therapy. Diabetes insipidus, however, remained, in spite of X ray radiotherapy for the pituiary lesion. 相似文献
52.
Y Miyagawa K Aritake N Saito K Mishima H Segawa K Sano J Iwata 《No shinkei geka. Neurological surgery》1990,18(2):205-208
A case of thrombasthenia (Glanzmann) associated with an intracerebral cavernous angioma in a 32-year-old woman is reported. Since her childhood, the patient had experienced a tendency to develop purpura following minor trauma. But she had not had major bleeding even during pregnancy and delivery. On April 4, 1987, she presented generalized convulsion. A high density mass in the right temporal lobe was demonstrated with CT scan. Carotid angiogram was normal except that the right anterior choroidal artery was stretched. Inhomogeneous signal intensities in T1- and T2-weighted MRI images were seen in the tumor locus. The clinical diagnosis was cavernous angioma which was complicated with intracerebral hemorrhage. The patient had a disorder of platelet function without thrombocytopenia. Her bleeding time was markedly prolonged. Because of this, we did not try surgical excision at first. During the 13-month observation period, however, intracerebral bleeding occurred 5 times. We decided to operate on the patient using fresh blood and platelet transfusion. The postoperative course was uneventful and pathological diagnosis confirmed cavernous angioma. We would like to emphasize possible pitfalls in treating cases of intracerebral angioma with thrombasthenia. 相似文献
53.
Chromosomal Mapping of Genetic Locus Associated with Thymus-size Enlargement in BUF/Mna Rats 总被引:2,自引:1,他引:1
Yoshiki Murakumo Masahide Takahashi Atsushi Arakawa Mitsuhiro Saito Hiroyuki Amo Hideki Katoh Mutsushi Matsuyama 《Cancer science》1993,84(8):838-840
The thymoma-prone rat of the BUF/Mna strain is a useful model for human thymoma. In this strain thymoma development is regulated by a single autosomal susceptible gene, Tsr-1. At pre-thymoma age, BUF/Mna rats have extremely large thyrauses, when compared to those of other strains of rats. Genetic studies in crosses between BUF/Mna rats with large thymuses and WKY/NCrj rats with small thymuses suggested the presence of a major autosomal gene, Ten-1 , which contributes to thymus enlargement in a backcross population. Linkage studies between Ten-1 and microsatellite markers in backcross rats of (WKY/NCrj×BUF/Mna)Fl×BUF/Mna have led to the localization of Ten-1 in chromosome 1. This result may provide an approach to clone Tsr-1 , which could be allelic to Ten-1. 相似文献
54.
Hiroshi Inada Hiroyuki Horio Kiyomu Ishikawa Hiromichi Yoshikawa Eishi Harasawa Hidehiro Hosaka 《Journal of medical systems》1993,17(3-4):257-266
A filing system for ocular fundscopic image data was developed by using a personal computer for the Twin AMHTS. The development of the system was tried as one of the data transfer system including image data between two similar AMHTSs named the Twin AMHTS through the information network system. The filing system is capable of storing 26782 data of ophthalmoscopic pictures with a data compression mode by using a magneto-optical disk (MOD) whose storage capacity of both sides is 616 MB. It takes no long time for retrieval and display of the image data in the filing system. Good quality of compression and decompression obtained and reproducibility of the ocular fundus picture is favorable regardless of normal or abnormal cases. As a result, it is suggested that the developed system has practical utility although it requires more improvement. 相似文献
55.
A case of small cell carcinoma of the prostate without a primary lesion in the lung was reported. The cancer was diagnosed after the patient complained of lumbago caused by bone metastasis. The tumor was 5.9 times 5.0 times 4.6cm. The patient was treated with 4 courses of chemotherapy using cisplatin and etoposide. The tumor diminished to 4.0 times 4.0 times 3.5 cm after completion of the 4 courses of treatment. Prostatic antigen levels were less than 1.0ng/mL during the therapy. Neuron-specific enolase levels were 35.9ng/mL at the beginning of therapy, and decreased to 7.4 ng/mL after completion of 4 courses of treatment. The patient died 3 months after the completion of treatment. This regimen had some value for inhibiting the growth of small cell carcinoma. 相似文献
56.
Yuka Takakura Hiroyuki Murai Hirokazu Furuya Hirofumi Ochi Jun-ichi Kira 《Clinical neurology》2005,45(5):346-350
A 74-year-old woman suffered from progressive muscle atrophy and weakness of her arms since she was seventy two years old. Before referral to our department, she was diagnosed as having cervical spondylotic myeloradiculopathy and received spinal fusion. Though spinal decompression was successful, muscle weakness of her upper limbs were progressive even after the surgery. On admission, neurological examinations revealed marked atrophy and weakness of her bilateral upper limbs with absent deep tendon reflexes showing man-in-the-barrel syndrome. Her lower extremities had normal muscle strength, but fasciculations were seen in her all four limbs. Electrophysiologically, motor nerve conduction velocity was almost normal but the amplitude was remarkably decreased, conduction block was not detected, and electromyography showed neurogenic patterns on her all extremities. Spinal progressive musclar atrophy (SPMA) accompanied with Sj?gren's syndrome was the likely diagnosis. Because 50 kDa anti-neuronal antibodies were found in her serum, we assumed that anterior horn cells were impaired by an autoimmune mechanism. Thus we treated her with corticosteroid pulse therapy, plasma exchange (PE) and intravenous immunoglobulin infusion therapy (IVIG). Although steroid pulse therapy only had a minimal effect, PE and IVIG promoted a remarkable improvement on her weakness, and the effect lasted for about three months. This is the first case of SPMA with Sj?gren's syndrome which showed good response to PE and IVIG in the early course of the disease. We considered that some SPMA-like motor neuron syndrome accompanied with autoimmune features may require immunomodulating therapies. 相似文献
57.
Tsuneo Takebayashi Hiroyuki Obata Yasuhiko Minaki Masatoshi Sekine Kenshi Imoto Kazutoshi Yokogushi Toshihiko Yamashita 《Journal of orthopaedic science》2006,11(3):259-263
Background Cat cry syndrome is an autosomal disease accompanying abnormal deletion of chromosome 5 and occurs in only 1 of 50,000 neonates.
Scoliosis has been reported as a skeletal complication in cat cry syndrome. The characteristics and causes of scoliosis in
this rare syndrome are unknown. The purpose of this study was to present the characteristics of scoliosis in cat cry syndrome
and to speculate on its causative mechanisms.
Methods We report on 11 cases (5 boys and 6 girls) of cat cry syndrome. Detailed investigations of scoliosis, as well as physical
and imaging examinations, were performed to characterize scoliosis and its causes. Average age at initial diagnosis of scoliosis
was 4.3 years, and average age at final examination was 11.8 years.
Results The incidence of scoliosis was as high as 73% (8/11). Most cases show a single right thoracic curve. Of the 8 patients with
scoliosis, 3 patients who had increased muscular tone showed marked progression of scoliosis with growth.
Conclusions Muscular hypertonia may play a key role in the progression of scoliosis in cat cry syndrome. 相似文献
58.
We studied the histochemical staining and biochemical activity of AMP deaminase in biopsied muscle in Becker-type muscular dystrophy (BMD), Fukuyama-type congenital muscular dystrophy (FCMD), Duchenne-type muscular dystrophy (DMD), Werdnig-Hoffmann disease (WH) in order to elucidate the change of AMP deaminase activity in muscle with neuromuscular disorders in childhood. The intensity of AMP deaminase staining did not decrease in BMD with mild pathologic change, but in DMD, FCMD and WH it decreased in parallel with the severity of the pathologic change. The biochemical activity of AMP deaminase did not decrease in muscle with mild pathologic change in patients with DMD and tended to decrease according to the progress of the disease. The activity of AMP deaminase in muscle of patients with FCMD and WH which showed severe pathologic change was remarkably low. It was demonstrated that the decrease in the activity of AMP deaminase was related to the intensity of pathologic change rather than diagnosis of a neuromuscular disorder. 相似文献
59.
We report a rare case of neglected fracture dislocation of the second and third carpometacarpal joints, which was treated by arthrodesis of the involved joints. 相似文献
60.