全文获取类型
收费全文 | 1574篇 |
免费 | 90篇 |
国内免费 | 22篇 |
学科分类
工业技术 | 1686篇 |
出版年
2023年 | 12篇 |
2022年 | 25篇 |
2021年 | 48篇 |
2020年 | 30篇 |
2019年 | 33篇 |
2018年 | 60篇 |
2017年 | 57篇 |
2016年 | 58篇 |
2015年 | 47篇 |
2014年 | 58篇 |
2013年 | 117篇 |
2012年 | 91篇 |
2011年 | 112篇 |
2010年 | 93篇 |
2009年 | 73篇 |
2008年 | 76篇 |
2007年 | 56篇 |
2006年 | 51篇 |
2005年 | 52篇 |
2004年 | 42篇 |
2003年 | 40篇 |
2002年 | 39篇 |
2001年 | 14篇 |
2000年 | 32篇 |
1999年 | 41篇 |
1998年 | 58篇 |
1997年 | 41篇 |
1996年 | 24篇 |
1995年 | 36篇 |
1994年 | 22篇 |
1993年 | 14篇 |
1992年 | 8篇 |
1991年 | 9篇 |
1989年 | 3篇 |
1988年 | 6篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 7篇 |
1984年 | 6篇 |
1983年 | 9篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 10篇 |
1977年 | 10篇 |
1976年 | 13篇 |
1974年 | 5篇 |
1973年 | 3篇 |
1972年 | 5篇 |
排序方式: 共有1686条查询结果,搜索用时 156 毫秒
91.
Utilisation possibility of Enterococcus faecalis isolates from neonate's faeces for production of fermented sausages as starter cultures 下载免费PDF全文
Hoa Van Ba Hyun‐Woo Seo Soo‐Hyun Cho Yoon‐Seok Kim Jin‐Hyoung Kim Beom‐Young Park Hyun‐Wook Kim Jun‐Sang Ham Pil‐Nam Seong 《International Journal of Food Science & Technology》2017,52(7):1660-1669
This study aimed at assessing the utilisation possibility of Enterococcus faecalis as starter cultures for production of fermented sausages. The E. faecalis isolates isolated from faeces samples of 5‐day‐old healthy newborn babies, identified by 16SrDNA sequencing and free from virulence determinants as proven by genomic sequencing, were used for fermented sausages production as starter culture. Six treatments (four inoculated with four different E. faecalis isolates, one with commercial starter culture and one control) were prepared. The inoculation with E. faecalis showed a stronger acidification compared with the control. The treatments with E. faecalis showed significantly higher flavour and acceptability scores in comparison with the control or commercial starter culture. Both of commercial starter culture and E. faecalis were positive with tyramine. Apart from the amine production, the inoculation with E. faecalis generally improved the acidifying activity and flavour of the products, suggesting their application potentials in fermented sausages production as starter cultures. 相似文献
92.
93.
94.
Porcelain, wall/floor tiles, and roofing tiles are classified as traditional ceramics and are produced from natural raw materials such as clay, quartz, and feldspar. The raw materials are selected by the oxide content which provides the desired properties of the final product. However, impurities such as Fe2O3 and TiO2 may have a significant influence on both physical/mechanical properties and aesthetic appearance. Fe2O3, which is of particular importance, causes black maculation formation in tablewares, in which whiteness is essential. The only way to overcome the black maculation is to corrupt the Fe2O3 crystal structure and to employ Fe2+/3+ cation, making a solid solution with a host crystal (i.e. mullite-3Al2O3·2SiO2). The aim of this study is to identify the solubility limit of Fe2O3 in mullite crystals. With the scope of the study, an illite/kaolinite was utilized by adding an increasing amount of Fe2O3 (e.g. 1–2–4–6–8–10?wt%) into the recipes fired at 1300?°C for 3?h after homogenization. According to the mullite phase content, it is concluded that ~ 5?wt% of Fe2O3 could be dissolved in mullite crystal structure on the basis of the Rietveld refinement of the XRD patterns. 相似文献
95.
Şeyda Karaman Esma Tütem Kevser Sözgen Başkan Reşat Apak 《Journal of the science of food and agriculture》2013,93(4):867-875
BACKGROUND: Apples contain a large concentration of phenolic compounds, dependent on factors such as cultivar, harvest, storage conditions, and processing. This study aims to identify the essential phenolic compounds present in various apple varieties, to measure their total antioxidant capacity (TAC) with the CUPRAC (cupric ion reducing antioxidant capacity) and ABTS (2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulfonate)) methods, and to correlate their TAC values with HPLC findings. RESULTS: The order of TAC (mmol Trolox g?1 fresh weight) of apple peels determined with the CUPRAC method was: Granny Smith > Amasya > Sky Spur > Ervin Spur > King Luscious ≥ Arap Kizi ≥ Lutz Golden. The theoretically calculated TAC values of HPLC‐quantified compounds, with the aid of the combined HPLC‐CUPRAC method, accounted for 18.4–33.5% of the experimentally observed CUPRAC capacity of peel extracts and 19.5–56.3% of flesh extracts, depending on apple variety. CONCLUSION: In synthetic samples of apple antioxidants, the CUPRAC‐TAC values of constituents, identified and analyzed by HPLC, proved to be additive, enabling measurement of the cooperative action of antioxidants using the proposed methodology. Apple peel showed higher contents of phenolics and therefore higher TAC than apple flesh, confirming the health benefit of the consumption of apples together with peel. © 2012 Society of Chemical Industry 相似文献
96.
It was aimed in this study to identify and quantify various constituents (particularly phenolics) of apple juice and to quantitatively compare the total antioxidant capacities of juices obtained from apple varieties grown in Turkey. 相似文献
97.
本文提出一个对DEBUG的动态跟踪调试G命令和T命令进行修改的方法,用INTF3H代替INT3H,将T和G命令的共同处理部分分开,并给出了实现方法、具体门牌详细的修改程序清单。 相似文献
98.
Pichia sorbitophila grows rapidly in the presence of very high NaCl concentrations. Under these conditions, even when the K(+) concentration is low, P. sorbitophila cells can maintain low Na(+) and high K(+) contents. This remarkable capacity of P. sorbitophila fails when the external pH is not acidic. This indicates that Na(+) efflux is mediated by an electroneutral Na(+)/H(+) antiporter. We have cloned and sequenced two genes designated as PsNHA1 and PsNHA2, which probably encode two antiporters of this type. The genes present high similarity with the corresponding genes from other yeasts. The heterologous expression of PsNHA1 or PsNHA2 in a Saccharomyces cerevisiae mutant lacking the Na(+) efflux systems and sensitive to high concentrations of Na(+) and K(+) rescued the tolerance and the ability to extrude both cations. The Accession Nos of the sequenced DNA fragments are: PsNHA1, AJ496431; PsNHA2, AJ496432. (TC 2.A.36) Copyright 2002 John Wiley & Sons, Ltd. 相似文献
99.
Anti-atherogenic diet supplemented with 20 g soy oil has been analyzed in patients with coronary artery disease and high blood pressure. The vegetable PUFA omega-3 and omega-6 from soy oil have been found to change physical, biological and chemical property of membranes; improved clinical condition as well as to modify erythrocyte membrane fatty acid composition. 相似文献
100.