全文获取类型
收费全文 | 328篇 |
免费 | 29篇 |
国内免费 | 1篇 |
专业分类
综合类 | 22篇 |
化学工业 | 85篇 |
机械仪表 | 2篇 |
建筑科学 | 3篇 |
能源动力 | 9篇 |
轻工业 | 221篇 |
石油天然气 | 9篇 |
一般工业技术 | 5篇 |
冶金工业 | 1篇 |
自动化技术 | 1篇 |
出版年
2024年 | 3篇 |
2023年 | 5篇 |
2022年 | 5篇 |
2021年 | 3篇 |
2020年 | 8篇 |
2019年 | 9篇 |
2018年 | 7篇 |
2017年 | 10篇 |
2016年 | 6篇 |
2015年 | 17篇 |
2014年 | 17篇 |
2013年 | 12篇 |
2012年 | 20篇 |
2011年 | 17篇 |
2010年 | 14篇 |
2009年 | 12篇 |
2008年 | 6篇 |
2007年 | 24篇 |
2006年 | 22篇 |
2005年 | 20篇 |
2004年 | 16篇 |
2003年 | 17篇 |
2002年 | 11篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 7篇 |
1998年 | 12篇 |
1997年 | 4篇 |
1996年 | 7篇 |
1995年 | 6篇 |
1994年 | 6篇 |
1993年 | 10篇 |
1992年 | 9篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有358条查询结果,搜索用时 15 毫秒
41.
较为详细地介绍三种主要油料饼粕——茶籽饼粕、菜籽饼粕、棉籽饼粕的成份、有毒成份的毒性、脱毒方法及其原理,其中介绍了目前一些新的脱毒技术. 相似文献
42.
43.
Soy and cottonseed proteins appear promising as sustainable and environment-friendly wood adhesives. Because of their higher cost relative to formaldehyde-based adhesives, improvement in the adhesive performance of proteins is needed. In this work, we evaluated the adhesive properties of soy and cottonseed protein formulations that included phosphorus-containing acids and esters. For cottonseed protein isolate, most of these additives improved dry adhesive strength, with methylphosphonic acid, phosphorous acid, and phosphoric acid increasing the dry strength by 47, 44, and 42%, respectively, at their optimal concentrations. For soy protein isolate, these additives did not show significant benefits. The phosphorus-containing additives also improved the hot water resistance of the cottonseed protein formulations but showed either no effect or a negative effect for the of soy protein formulations. Thus, the combination of cottonseed protein with phosphorus additives appears to be attractive as wood adhesives. 相似文献
44.
Potential involvement of seed storage proteins in susceptibility to aflatoxin contamination was assessed with in vitro tests. Initially, two oilseed storage proteins [cottonseed storage protein (CSP) and zein] were compared with bovine serum
albumin (BSA) and collagen. Supplementation of a complete defined medium with either oilseed storage protein resulted in significantly
more aflatoxin production by Aspergillus flavus than supplementation with either BSA or collagen. Little or no aflatoxin was produced when either BSA, CSP, or zein was employed
(at 0.5%) as both the sole carbon and the sole nitrogen source. Media with collagen (0.5%) as the sole nitrogen and carbon
source supported aflatoxin production similar to the complete defined medium. Although lower than levels observed with defined
medium, aflatoxin production increased with both increasing CSP concentration (0 to 2.0%) and increasing zein concentration
(0 to 6.0%) when these proteins served as both the sole carbon and sole nitrogen source. Denaturing polyacrylamide gel electrophoresis
and protease activity assays indicated that fungal acquisition of protein carbon was probably via hydrolysis mediated by the 35 kD metalloprotease of A. flavus. Media lacking nitrogen but containing sucrose (5.0%) and supplemented with either zein (1.7%) or CSP (2.0%) supported three-
to eightfold more aflatoxin production than the complete defined medium. The results suggest seed storage proteins, when present
with an accessible carbon source, may predispose oilseed crops to support production of high levels of aflatoxins by A. flavus during seed infection. 相似文献
45.
Potential involvement of seed storage proteins in susceptibility to aflatoxin contamination was assessed with in vitro tests. Initially, two oilseed storage proteins [cottonseed storage protein (CSP) and zein] were compared with bovine serum
albumin (BSA) and collagen. Supplementation of a complete defined medium with either oilseed storage protein resulted in significantly
more aflatoxin production by Aspergillus flavus than supplementation with either BSA or collagen. Little or no aflatoxin was produced when either BSA, CSP, or zein was employed
(at 0.5%) as both the sole carbon and the sole nitrogen source. Media with collagen (0.5%) as the sole nitrogen and carbon
source supported aflatoxin production similar to the complete defined medium. Although lower than levels observed with defined
medium, aflatoxin production increased with both increasing CSP concentration (0 to 2.0%) and increasing zein concentration
(0 to 6.0%) when these proteins served as both the sole carbon and sole nitrogen source. Denaturing polyacrylamide gel electrophoresis
and protease activity assays indicated that fungal acquisition of protein carbon was probably via hydrolysis mediated by the 35 kD metalloprotease of A. flavus. Media lacking nitrogen but containing sucrose (5.0%) and supplemented with either zein (1.7%) or CSP (2.0%) supported three-
to eightfold more aflatoxin production than the complete defined medium. The results suggest seed storage proteins, when present
with an accessible carbon source, may predispose oilseed crops to support production of high levels of aflatoxins by A. flavus during seed infection. 相似文献
46.
棉籽蛋白发泡粉生产工艺及其应用的研究 总被引:7,自引:0,他引:7
贾德君 《大连轻工业学院学报》1999,18(3):217-221
研究了植物蛋白起泡剂的生产原理及工艺路线,对其影响因素和产品的实际应用作了探讨。结果表明:利用此工艺方法生产的棉籽蛋白发泡性达900ml/200ml2%溶液,其中包含游离棉酚质量分数小于0.002%。 相似文献
47.
为方便分析锯齿轧花过程中籽棉的受力状况以期提高皮棉质量,在已有的层合板棉朵模型和三维编织棉朵模型基础上,提出了一种含棉籽的棉朵模型。该模型基于实际棉朵中棉籽以及棉纤维束排列呈立体网状结构的规律,假设纤维束具有圆形截面,截面形状沿轴向保持不变,在该模型的基础上利用ANSYS Workbench对轧花过程进行了模拟,研究了不同锯齿滚筒转速和棉籽密度对轧花过程的影响。结果表明:锯齿滚筒转速越大,棉纤维受影响越剧烈,但转速过大也会损伤棉纤维,棉籽密度在580 kg/m3时锯齿轧花效果最明显;实验值与模拟值误差相对较小,说明了模型的合理性。 相似文献
48.
溶剂法浸出棉籽油和脱除棉酚的工艺研究 总被引:15,自引:2,他引:13
综述了采用单一溶剂或混合溶剂浸出棉仁生坯(或饼),提取棉籽油并脱除棉籽粕中棉酚的工艺研究进展情况。 相似文献
49.
50.
Feng Yu W C McNabb T N Barry P J Moughan 《Journal of the science of food and agriculture》1996,72(2):263-272
The effects of heat treatment on the chemical composition of cottonseed meal (CSM), with or without the addition of cottonseed hulls (containing condensed tannins; CT), and upon reactivity of the CT were studied. Heat was applied in a forced draught oven at 100°C for 2 h. Fluorodinitrobenzene (FDNB)-available lysine, free gossypol, extractable- and bound-CT concentrations, in vitro total nitrogen (N) solubility and the in vitro rumen degradation of the two major seed proteins (52 and 48 kDa) present in cottonseed kernel (which does not contain CT) were determined. The reactivity of CT was assessed by determining N solubility and rumen degradation of cottonseed kernel proteins in the presence or absence of polyethylene glycol (PEG; molecular weight (MW) 3500), which binds and inactivates CT. Heat treatment reduced the concentrations of free gossypol and FDNB-available lysine by small amounts, reduced measurable total CT content by 13%, reduced the solubility of total N, and reduced potential degradability of the 52 and 48 kDa cottonseed storage proteins by mixed rumen microorganisms. Addition of hulls further depressed solubility of total N and ruminal degradation of the two major storage proteins in cottonseed kernel. The action of PEG in vitro indicated that only part of the depression caused by hull addition could be explained by the presence of CT in the hulls, and that the effects of CT upon N solubility and potential degradability in heated CSM were similar to that in unheated CSM. Addition of hulls also substantially reduced FDNB-available lysine. In commercially produced materials, CSM from the Brisbane mill had a lower total CT content, lower N solubility and lower ruminal protein degradation rate than CSM from the Narrabri mill, but a similar level of FDNB-available lysine. Although application of heat inactivated 13% of the total CT, such that it could no longer be extracted and detected with butanol/HCl, it did not seem to change the overall effects produced by CT in reducing N solubility and protein degradation. The effect of hull addition in reducing available lysine has considerable relevance for feeding CSM to monogastric livestock. Interactions involving heat, hulls and CT need to be further studied. 相似文献