全文获取类型
收费全文 | 61篇 |
免费 | 1篇 |
专业分类
综合类 | 4篇 |
化学工业 | 13篇 |
机械仪表 | 3篇 |
建筑科学 | 1篇 |
轻工业 | 33篇 |
水利工程 | 2篇 |
无线电 | 2篇 |
一般工业技术 | 1篇 |
原子能技术 | 2篇 |
自动化技术 | 1篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 5篇 |
2012年 | 8篇 |
2011年 | 5篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 5篇 |
2007年 | 3篇 |
2006年 | 1篇 |
2005年 | 3篇 |
2004年 | 3篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1994年 | 1篇 |
1991年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有62条查询结果,搜索用时 265 毫秒
1.
Bullfrogs (Rana catesbeiana), native to eastern North America, were introduced into Oregon in the 1930's. Bullfrogs are highly efficient predators that are known to eat a variety of prey including other amphibians. In laboratory experiments, we investigated whether juvenile Pacific treefrogs (Hyla regilla) recognize adult bullfrogs as a predatory threat. The ability of prey animals to acquire recognition of an introduced predator has important implications for survival of the prey. We found that treefrogs from a population that co-occurred with bullfrogs showed a strong avoidance of chemical cues of bullfrogs. In contrast, treefrogs from a population that did not co-occur with bullfrogs, did not respond to the bullfrog cues. Additional experiments showed that both populations of treefrogs use chemical cues to mediate predation risk. Treefrogs from both populations avoided chemical alarm cues from injured conspecifics. 相似文献
2.
采用冰乙酸和胃蛋白酶依次对新鲜林蛙皮胶原蛋白进行提取.在冰乙酸提取过程中,首先通过控制单一因素变量对料液比、pH值、冰乙酸浓度、酸解时间和温度等5个因素对新鲜林蛙皮胶原蛋白提取率的影响进行研究,并采用正交实验考察林蛙皮胶原蛋白酸解提取的最佳工艺;其次,在冰乙酸提取的最优条件下,利用胃蛋白酶将酸解后的残余物进行再次酶解提取.实验结果表明,最佳酸解的工艺条件是:料液比为1∶30,pH为7.5,酸解时间为48 h,酸解温度为4℃,冰乙酸浓度为0.5 mol/L.在此工艺条件下,胶原蛋白的提取率为11.85%,胃蛋白酶对蛙皮残渣的提取率为5.25%,所得胶原蛋白的纯度为64.70%. 相似文献
3.
4.
5.
Eduardo Méndez Julio Sanhueza Susana Nieto Hernán Speisky Alfonso Valenzuela 《Journal of the American Oil Chemists' Society》1998,75(1):79-83
The oil extracted from the fat-storage organ (fat body) of the bullfrog (Rana catesbeiana) was characterized for its fatty acid composition. The main fatty acids were palmitic (18.1%), stearic (4.1%), myristic (2.7%),
oleic (31.7%), and linoleic (12.9%) acids. Long-chain polyunsaturated fatty acids were also present in significant amounts,
i.e., eicosapentaenoic (1.5%) and docosahexaenoic (4.7%), and were probably derived from the fish meal content of the diet.
A partially fractionated oil was extracted from the homogenized and frozen fat body with an oleic acid content of 43.2%. The
natural alkaloid boldine, added at 0.5 mg/g oil level, improved the oxidative stability by a factor ranging from 1.7 to 2.4,
as assessed by the Oil Stability Index method between 90 and 110°C. The stabilization effect of boldine was higher than that
of naringenin, morin, and quercitin and for the synthetic antioxidant butylated hydroxytoluene at the same concentration level. 相似文献
6.
7.
8.
在酶适宜的环境条件下,利用木瓜蛋白酶与中性蛋白酶酶解石蛙肉及利用乳酸菌、黄酒酵母对酶解液进行风味改良。结果表明,中性蛋白酶对石蛙的水解效果较好,乳酸菌发酵液中氨态氮含量较高,乳酸菌发酵液风味改良效果优于黄酒酵母。 相似文献
9.
10.
高压脉冲电场提取中国林蛙多糖的研究 总被引:12,自引:3,他引:12
通过单因素考察及正交试验优化了用高压脉冲电场提取中国林蛙多糖的试验条件,并与碱提取法、酶提取法以及复合酶提取法进行了比较。结果显示用0.5%KOH提取液,在电场强度为20kv/cm和脉冲数为6μs的条件下用高压脉冲电场提取林蛙多糖的提取率最大为55.59%。比较高压脉冲电场提取法与碱法、酶法以及复合酶法在林蛙多糖提取率、总糖含量方面的差异,高压脉冲电场提取的林蛙多糖提取率和总糖含量均高于其他三种方法,其提取率是复合酶法的1.77倍,总糖含量高于复合酶法6.34%,且提取物中杂质少。因此,高压脉冲电场提取多糖是一种很有希望的多糖提取新方法。 相似文献