全文获取类型
收费全文 | 2065774篇 |
免费 | 151050篇 |
国内免费 | 3169篇 |
专业分类
耳鼻咽喉 | 29784篇 |
儿科学 | 64794篇 |
妇产科学 | 54721篇 |
基础医学 | 292479篇 |
口腔科学 | 58537篇 |
临床医学 | 180435篇 |
内科学 | 408850篇 |
皮肤病学 | 44117篇 |
神经病学 | 161353篇 |
特种医学 | 81811篇 |
外国民族医学 | 726篇 |
外科学 | 325699篇 |
综合类 | 42458篇 |
现状与发展 | 2篇 |
一般理论 | 588篇 |
预防医学 | 148874篇 |
眼科学 | 46535篇 |
药学 | 156108篇 |
5篇 | |
中国医学 | 4209篇 |
肿瘤学 | 117908篇 |
出版年
2018年 | 20536篇 |
2017年 | 15752篇 |
2016年 | 17336篇 |
2015年 | 19628篇 |
2014年 | 27267篇 |
2013年 | 40984篇 |
2012年 | 56129篇 |
2011年 | 59119篇 |
2010年 | 35333篇 |
2009年 | 33714篇 |
2008年 | 57152篇 |
2007年 | 60841篇 |
2006年 | 61636篇 |
2005年 | 59787篇 |
2004年 | 58269篇 |
2003年 | 56316篇 |
2002年 | 55267篇 |
2001年 | 107870篇 |
2000年 | 111942篇 |
1999年 | 94535篇 |
1998年 | 24126篇 |
1997年 | 21512篇 |
1996年 | 21958篇 |
1995年 | 20648篇 |
1994年 | 19375篇 |
1993年 | 17910篇 |
1992年 | 73598篇 |
1991年 | 71409篇 |
1990年 | 69301篇 |
1989年 | 66784篇 |
1988年 | 61255篇 |
1987年 | 59978篇 |
1986年 | 55979篇 |
1985年 | 53711篇 |
1984年 | 39351篇 |
1983年 | 33248篇 |
1982年 | 18413篇 |
1981年 | 16493篇 |
1979年 | 35128篇 |
1978年 | 23990篇 |
1977年 | 20545篇 |
1976年 | 18520篇 |
1975年 | 20226篇 |
1974年 | 23964篇 |
1973年 | 22870篇 |
1972年 | 21329篇 |
1971年 | 19784篇 |
1970年 | 18740篇 |
1969年 | 17253篇 |
1968年 | 15629篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
D P Taggart D C McMillan T Preston R Richardson A Shenkin H J Burns D J Wheatley 《Nutrition (Burbank, Los Angeles County, Calif.)》1991,7(4):271-274
Total energy expenditure (TEE) was measured by doubly labeled water in 13 preoperative patients undergoing elective coronary artery surgery and compared to resting energy expenditure (REE) measured by indirect calorimetry (IC) calculated from the Harris-Benedict (HB) formula or from formulas based on midarm circumference and arm muscle circumference. Mean REE measured by IC and calculated from the HB, midarm circumference, arm muscle circumference formulas were 62, 75, 62, and 69%, respectively, of TEE measured by doubly labeled water. REE measured by IC correlated significantly with that predicted by the HB (p = 0.006) but not the anthropometric formulas. The relationship between REE derived from anthropometric predictive formulas and REE measured by IC is altered in ischemic heart disease. 相似文献
992.
U Caliceti A Rinaldi Ceroni G Lisignoli P Chieco O Cavicchi 《Archives of oto-rhino-laryngology》1989,246(5):365-367
A microfluorometric method was used to determine the nuclear DNA content in the nasopharyngeal carcinomas (NPC) of 25 patients treated before 1983. Eleven patients are still alive with no evidence of disease (NED), while the rest died of their disease (DOD). All of the patients received a cycle of radiotherapy, while some also received chemotherapy or neck dissections. The neoplastic cells studied were taken from the original biopsy blocks, deparaffinized, isolated by enzymatic treatment and mechanical fragmentation, and then Feulgen-stained. The cytofluorometric measurement was carried out by a microphotometer equipped for fluorescence excitation and connected to a computer. This method allowed us to construct a histogram of the DNA content in the neoplastic cells. Different neoplastic classes were identified and represent the heteroclonality of the tumor, which can be expressed by the heteroclonality index (HCT). From the collected data it appears that the NED patients all had a low HTC (less than 1) and only 7 of the DOD patients had low HTCs (less than 1). Six of the DOD patients with a low HTC were in advanced stages of their tumor at the time of diagnosis, while the remaining patient did not complete his treatment. Our results show that the DNA analysis of the NPC cell population may offer a useful tool in predicting the biological behavior of this tumor and also improving its treatment. 相似文献
993.
Clinical applications of active anterior rhinomanometry of the oscillation type had been carried out for the purposes other than the conventional uses of rhinomanometry. 1. Effect of acupuncture upon the nasal resistance to airflow: Among 8 acupuncture points which were recorded in Chinese traditional medical literatures as effective for improving nasal breathing, Ingxiang point had been proved to possess definite effect of lowering the nasal resistance to air-flow in patients with congestion of nasal mucosa, whereas in other acupuncture points this effect was not certain. 2. The severity of snoring before and after treatment could be determined objectively by the measurement of nasal resistance to air-flow and the breathing pattern of the patient. 相似文献
994.
Twenty two patients (age range: 1 month to 11 years) were treated for congenital diaphragmatic defects (excluding hiatus hernia) in the six year period 1983-8. Presenting features were failure to thrive (n = 7), abdominal pain and vomiting (n = 4), chronic respiratory symptoms (n = 3), and inability to wean from ventilatory support (n = 3). The defect was an incidental finding in five patients. Operative repair was performed with no mortality or serious postoperative morbidity. Dramatic improvement occurred in 15 of the 17 symptomatic patients. Awareness of the differential diagnosis should avoid delay in diagnosis or inappropriate treatment. Surgical correction is strongly recommended in all cases. 相似文献
995.
996.
Relapsing polychondritis is an autoimmune disease that affects all body cartilages. The disease may also involve the audio-vestibular system, usually bilaterally. Most of the reported cases were adults 20 years old or more. This is a case report of a 12-year-old girl with unilateral sensorineural hearing loss, and a review of the literature. 相似文献
997.
The question of the necessity of in-patient facilities of the area of (child and) adolescent neuropsychiatry is to be discussed further. The extremely optimistic views on this question of approximately 20 years ago cannot be maintained for the examined area and the examination time. In the LNKH Valduna/Vorarlberg, an establishment that was intended exclusively for adults until 1987, from 1980-1984 (evaluated in detail) and from 1984-1987 a further 60 minors were admitted. The exact evaluation shows that the conspicuousnesses of behaviour of a main group was so clear each time that it could not be treated elsewhere and certainly not in outpatient facilities. In the examined group the amount of patients with behaviour and socialization disorders outweighed by far the psychoses, also a high percentage of patients was multi morbid and/or had multiple handicaps. The resulting conclusion seems to us to be the necessity of setting-up a specific in-patients treatment unit for this group of patients with sufficient infrastructure. 相似文献
998.
Ethmoidal mucocoeles in children 总被引:1,自引:0,他引:1
Children presenting with ethmoidal mucocoeles are rare. Five children are presented with such findings, and the diagnosis, treatment and possible aetiology discussed. C.T. scanning was found to be the investigation of choice, while plain sinus X-rays correlated poorly with the presence of disease. Exenteration through an external approach was found to be satisfactory. In two cases drainage obstruction due to congenital abnormality was thought to be the underlying cause, while in four cases there was a strong history of atopy, indicating allergy as a possible reason for mucocoele formation. 相似文献
999.
Phonological disorders in children: changes in phonological process use during treatment 总被引:2,自引:0,他引:2
Unintelligible speech in childhood is often characterised by the use of unusual or deviant (i.e. non-developmental) phonological processes, e.g. initial consonant deletion. These processes are reported to appear at speech onset and to undergo little spontaneous change during the preschool years. The study reported here documents the changes that occurred in the phonological systems of seven phonologically disordered children during remediation that targeted unusual phonological processes. Qualitative changes in phonological process use were observed for all children. Six of the children made quantitative improvement in terms of the percentage consonants produced correctly in spontaneous speech. Individual differences in phonological learning strategy use are described. 相似文献
1000.
The effect of social learning intervention on metabolic control of insulin-dependent diabetes mellitus in adolescents 总被引:1,自引:0,他引:1
This paper reports the results of an experimental study modeled after a study conducted by Kaplan et al. The hypothesis tested was: Adolescents who receive a social learning intervention (SLI) will show greater improvement in metabolic control of their diabetes than will adolescents who receive only traditional diabetes instruction. Thirty-four adolescents between the ages of 12 and 16 who attended a midwestern camp were randomly divided into two groups. Both groups attended a daily 1-hour teaching session about diabetes. Later each day, the experimental group received an SLI consisting of role modeling to help the subjects circumvent peer pressure. To determine metabolic control, HbA1 values were determined before and 3 1/2 months after the intervention. The control group showed no significant difference in HbA1 values, while the experimental group showed a decrease in metabolic control. 相似文献