全文获取类型
收费全文 | 3385047篇 |
免费 | 252186篇 |
国内免费 | 5016篇 |
专业分类
耳鼻咽喉 | 47167篇 |
儿科学 | 111098篇 |
妇产科学 | 93832篇 |
基础医学 | 491710篇 |
口腔科学 | 96801篇 |
临床医学 | 305958篇 |
内科学 | 649202篇 |
皮肤病学 | 74112篇 |
神经病学 | 270127篇 |
特种医学 | 129201篇 |
外国民族医学 | 902篇 |
外科学 | 508921篇 |
综合类 | 76490篇 |
现状与发展 | 13篇 |
一般理论 | 1299篇 |
预防医学 | 267274篇 |
眼科学 | 79316篇 |
药学 | 253625篇 |
13篇 | |
中国医学 | 6359篇 |
肿瘤学 | 178829篇 |
出版年
2018年 | 35772篇 |
2017年 | 27245篇 |
2016年 | 30533篇 |
2015年 | 34721篇 |
2014年 | 48783篇 |
2013年 | 73904篇 |
2012年 | 101075篇 |
2011年 | 107341篇 |
2010年 | 63771篇 |
2009年 | 60480篇 |
2008年 | 101337篇 |
2007年 | 107746篇 |
2006年 | 108943篇 |
2005年 | 106001篇 |
2004年 | 102523篇 |
2003年 | 98202篇 |
2002年 | 95838篇 |
2001年 | 151203篇 |
2000年 | 155954篇 |
1999年 | 131878篇 |
1998年 | 38345篇 |
1997年 | 33979篇 |
1996年 | 33965篇 |
1995年 | 32494篇 |
1994年 | 30203篇 |
1993年 | 28512篇 |
1992年 | 105524篇 |
1991年 | 103172篇 |
1990年 | 100779篇 |
1989年 | 97393篇 |
1988年 | 90171篇 |
1987年 | 88527篇 |
1986年 | 83709篇 |
1985年 | 80628篇 |
1984年 | 60450篇 |
1983年 | 51847篇 |
1982年 | 30773篇 |
1981年 | 27747篇 |
1979年 | 56805篇 |
1978年 | 40222篇 |
1977年 | 33744篇 |
1976年 | 32147篇 |
1975年 | 34381篇 |
1974年 | 41601篇 |
1973年 | 39786篇 |
1972年 | 37135篇 |
1971年 | 35072篇 |
1970年 | 32345篇 |
1969年 | 30732篇 |
1968年 | 28097篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
We describe a simple fluorometric method for determining aluminum in serum samples by monitoring the rate of reaction of 2-hydroxy-1-naphthaldehyde-p-methoxybenzoylhydrazone with aluminum ions. The emission of the resulting fluorescent metal-chelate formed is measured at 475 nm. Aluminum was measured in the supernate of serum after proteins were removed by precipitation with concentrated nitric acid, and calculations were based on the technique of standard additions. Within-run precision (CV) was 7.8% and 4.8% at mean aluminum concentrations of 7.7 and 60.7 micrograms/L, respectively (n = 10); between-run precision (CV) was 8.9% and 5.7% at mean aluminum concentrations of 23.3 and 46.8 micrograms/L, respectively (n = 10). The standard curve for the method is linear over the range of 0-250 micrograms of aluminum per liter. Samples from 49 patients were analyzed for aluminum by the proposed method (y) and by electrothermal atomic absorption spectroscopy (x). Linear regression analysis of the results yielded the equation y = 0.98x + 2.3 (r = 0.989, Syx = 6.7). The proposed method is comparable in sensitivity to the well-accepted atomic absorption spectrometric method but is simpler and less expensive. 相似文献
992.
There is a recognized need for the early detection of gestational diabetes, and a single blood test, if reliable, would be advantageous. Because serum albumin and total protein are glycosylated and have short life spans, we investigated the usefulness of glycosylated albumin and glycosylated protein in the detection of gestational diabetes. We studied five groups, each with 20 subjects: nonpregnant and pregnant controls, nonpregnant and pregnant insulin-dependent diabetic (IDDM) patients, and gestational diabetic patients. All patients with no history of diabetes had an oral glucose tolerance test to define their carbohydrate status. Our results showed that percent glycosylated albumin and percent glycosylated protein were significantly elevated in both groups of IDDM patients compared with the other groups. However, gestational diabetic patients had glycosylated albumin and glycosylated protein values similar to those of both control groups. Both glycosylated albumin and glycosylated protein correlated well with HbA1c determinations. Thus, glycosylated albumin and glycosylated protein may be a good index of glycemic control, but they are of little value in the diagnosis of gestational diabetes because of a lack of sensitivity: 8 and 3% for glycosylated albumin and glycosylated protein, respectively. 相似文献
993.
D R Morse 《Hawaii dental journal》1987,18(11):10-3, 24, 26
994.
995.
996.
997.
998.
Management of severe mandibular retrognathia in the adult patient using distraction osteogenesis. 总被引:1,自引:0,他引:1
David A Walker 《Journal of oral and maxillofacial surgery》2002,60(11):1341-1346
999.