全文获取类型
收费全文 | 279篇 |
免费 | 11篇 |
国内免费 | 2篇 |
专业分类
化学 | 161篇 |
晶体学 | 2篇 |
力学 | 9篇 |
数学 | 11篇 |
物理学 | 109篇 |
出版年
2023年 | 4篇 |
2022年 | 3篇 |
2021年 | 10篇 |
2020年 | 6篇 |
2019年 | 11篇 |
2018年 | 11篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 20篇 |
2014年 | 8篇 |
2013年 | 22篇 |
2012年 | 32篇 |
2011年 | 26篇 |
2010年 | 10篇 |
2009年 | 15篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 11篇 |
2005年 | 4篇 |
2004年 | 8篇 |
2003年 | 5篇 |
2002年 | 9篇 |
2000年 | 2篇 |
1997年 | 8篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 8篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有292条查询结果,搜索用时 62 毫秒
291.
Honnur Krishna Avinash Krishnegowda Shivakumar Anantharaman Kumar Shrestha Ashwinee A Edalli Vijayalakshmi 《中国化学会会志》2023,70(4):894-908
A simple, fast, sensitive, convenient, and economical accurate enzymatic colorimetric sensor is developed for the quantification of the clinically important biomarker uric acid (UA) in human serum samples. The method is based on the quantification of UA using 3-hydroxytyramine (3-HT) as a chromogenic substrate by using peroxidase (POD) and uricase (UOx). UOx catalyzes the oxidation of UA where H2O2 is generated in-situ to produce allantoin and CO2. The POD in oxidative coupling of peroxide in presence of 3-HT, forms an intense orange-colored product with λmax = 500 nm. The reaction was carried out in a citric acid-tripotassium-citrate buffer (12.5 mM) of pH = 6.8 at room temperature. Computational calculations were done by Gaussian-16 employing the B3LYP functional basis set. The standard curve for UA was found to be linear between 12.3–297.3 and 3.07–396.5 μM by rate and fixed time method, respectively. The LOD and LOQ for UA were 1.5 and 2.9 μM, respectively. Within-day and day-to-day precision was 1.50–3.07 and 3.10–4.16% (n = 7), respectively. The accuracy ranges for UA concentrations of 24.7, 198 and 297.3 μM were 87%–101.50%, 90%–105%, and 89%–107%, respectively. The UA recovery range by the proposed method was 98.00%–100.47% with a mean recovery of 99.5% and has A good correlation coefficient of 0.981 with the standard method. 相似文献
292.
Hong-Guen Lee Dr. Avinash Dhamija Dr. Chandan K. Das Prof. Dr. Kyeng Min Park Prof. Dr. Young-Tae Chang Prof. Dr. Lars V. Schäfer Prof. Dr. Kimoon Kim 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2023,135(2):e202214326
Here we report synthetic monosaccharide channels built with shape-persistent organic cages, porphyrin boxes ( PB s), that allow facile transmembrane transport of glucose and fructose through their windows. PB s show a much higher transport rate for glucose and fructose over disaccharides such as sucrose, as evidenced by intravesicular enzyme assays and molecular dynamics simulations. The transport rate can be modulated by changing the length of the alkyl chains decorating the cage windows. Insertion of a linear pillar ligand into the cavity of PB s blocks the monosaccharide transport. In vitro cell experiment shows that PB s transport glucose across the living-cell membrane and enhance cell viability when the natural glucose transporter GLUT1 is blocked. Time-dependent live-cell imaging and MTT assays confirm the cyto-compatibility of PB s. The monosaccharide-selective transport ability of PB s is reminiscent of natural glucose transporters (GLUTs), which are crucial for numerous biological functions. 相似文献