全文获取类型
收费全文 | 264篇 |
免费 | 15篇 |
国内免费 | 5篇 |
专业分类
综合类 | 24篇 |
化学工业 | 67篇 |
金属工艺 | 2篇 |
轻工业 | 186篇 |
石油天然气 | 1篇 |
一般工业技术 | 4篇 |
出版年
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 7篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 7篇 |
2014年 | 11篇 |
2013年 | 20篇 |
2012年 | 35篇 |
2011年 | 37篇 |
2010年 | 16篇 |
2009年 | 12篇 |
2008年 | 20篇 |
2007年 | 28篇 |
2006年 | 29篇 |
2005年 | 15篇 |
2004年 | 12篇 |
2003年 | 4篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1992年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有284条查询结果,搜索用时 0 毫秒
41.
42.
43.
44.
45.
46.
47.
48.
莲子心总黄酮的微波辅助提取研究 总被引:2,自引:0,他引:2
研究了莲子心中总黄酮的微波辅助提取工艺条件.以芦丁为对照品,采用分光光度法测定莲子心中总黄酮的含量,探讨了乙醇质量浓度、固液比(g:mL)、微波辐射功率、微波辐射时间等因素对莲子心总黄酮提取率的影响;采用单因素实验和正交实验确定微波辅助提取莲子心总黄酮的优化工艺条件如下:乙醇质量浓度65%、固液比1:25(g:mL)、... 相似文献
49.
Suvi Manner Malena Skogman Darla Goeres Pia Vuorela Adyary Fallarero 《International journal of molecular sciences》2013,14(10):19434-19451
When single-cell (or suspended) bacteria switch into the biofilm lifestyle, they become less susceptible to antimicrobials, imposing the need for anti-biofilms research. Flavonoids are among the most extensively studied natural compounds with an unprecedented amount of bioactivity claims. Most studies focus on the antibacterial effects against suspended cells; fewer reports have researched their anti-biofilm properties. Here, a high throughput phenotypic platform was utilized to screen for the inhibitory activity of 500 flavonoids, including natural and synthetic derivatives, against Staphylococcus aureus biofilms. Since discrepancies among results from earlier antibacterial studies on flavonoids had been noted, the current study aimed to minimize sources of variations. After the first screen, flavonoids were classified as inactive (443), moderately active (47) or highly active (10). Further, exclusion criteria combining bioactivity and selectivity identified two synthetic flavans as the most promising. The body of data reported here serves three main purposes. First, it offers an improved methodological workflow for anti-biofilm screens of chemical libraries taking into account the (many times ignored) connections between anti-biofilm and antibacterial properties. This is particularly relevant for the study of flavonoids and other natural products. Second, it provides a large and freely available anti-biofilm bioactivity dataset that expands the knowledge on flavonoids and paves the way for future structure-activity relationship studies and structural optimizations. Finally, it identifies two new flavans that can successfully act on biofilms, as well as on suspended bacteria and represent more feasible antibacterial candidates. 相似文献
50.
以苦瓜果实为原料,以总黄酮提取率为评价指标,通过单因素实验考察了微波功率、液固比、乙醇体积分数、苦瓜粉末粒度等对总黄酮提取率的影响;在此基础上,通过正交实验确定最佳提取工艺条件为:微波功率500 W、液固比11∶1(mL ∶ g)、乙醇体积分数60%、苦瓜粉末粒度80目,在此条件下总黄酮提取率为15.576 mg·g-1. 相似文献