Rachmawati L.,Tanning Technology |
Udkhiyati M.,Tanning Technology
Materials Science Forum | Year: 2017
The aim of this study was to investigate the toxicity level of chromium and glutaraldehyde. This research was conducted by testing the resistance level of fungi (Aspergillus niger sp.) toward glutaraldehyde and chromium in the medium of Potato Dextrose Agar (PDA). Variable of this experiment was the growth of Aspergillus niger sp. that indicates the resistance level of Aspergillus niger sp. The growth rate of Aspergillus niger sp. was classified on four scales. They were, (I) scale 1: zero growth; (II) scale 2: low growth (+); (III) scale 3: medium growth (++); (IV) Scale: 4 high growth (+++). All collected data were analysed by One Way ANOVA. The result showed that the toxicity of chromium and glutaraldehyde tanning material were highly significantly different toward Aspergillus niger (P<0,01). The Aspergillus niger sp. growth rate scale in chromium medium was high (scale 4: 4.00±0.00). Meanwhile, the growth rate scale of the Aspergillus niger sp. in glutaraldehyde medium was low (scale 2: 1.33 ± 0.58). Based on the fungi growth rate, it can be concluded that glutaraldehyde was more toxic than chromium tanning material toward Aspergillus niger sp. Furthermore, it can be said that glutaraldehyde is not quite ideal to be used as an alternative of chromium as a tanning material. © 2017, Trans Tech Publications Ltd. All rights reserved.
Nashy E.-S.H.A.,Tanning Technology |
Essa M.M.,National Research Center of Egypt |
Hussain A.I.,National Research Center of Egypt
Journal of Applied Polymer Science | Year: 2012
Two different nano-emulsions based on methyl methacrylate/butyl acrylate copolymers have been synthesized to be used as retanning and lubricating agents for chrome-tanned leather. The main difference and characteristics of the two prepared copolymers were studied. The nano particle size of the two copolymers was confirmed using transmission electron microscope (TEM). The influence of the prepared copolymers on chrome-tanned leather as retanning agents was investigated. The properties of the retanned leather, namely, physicomechanical properties as tensile strength, elongation at break and water absorption, were measured. Thermal gravimetric analysis (TGA) technique was used to examine the thermal stability of the retanned leather. Also, the texture of the grain surface and fibers were inspected using scanning electron microscope (SEM). The retanned leather showed an improvement in its physicomechanical properties, as well as enhancement of its thermal stability as compared with the chrome-tanned leather. Furthermore, the retanned leather has uniform dyestuff, softness, and firmness of grain. All these promising results provide evidence to the applicability of the prepared copolymer emulsions as efficient retanning and lubricating agents for chrome-tanned leather. © 2011 Wiley Periodicals, Inc.
Ola A.M.,Tanning Technology |
Habib M.A.,Tanning Technology |
El Sayed N.H.,Tanning Technology
Journal of the Society of Leather Technologies and Chemists | Year: 2014
Local animal bone fat was chemically treated with sodium sulfite via epoxidation in presence of an heterogeneous catalyst, Dowex 50wx2-200. This approach was to avoid fatty matter degradation when using direct oxidation. A high stability fatliquoring agent was produced. The fatliquor enhanced the mechanical properties of leather, including tensile strength, elongation at break %, and also exhibited better appearance.
News Article | May 15, 2001
Investor sentiment about IT services stocks is beginning to turn positive, as an increasing number of companies report decent Q1 earnings and deliver mildly optimistic forecasts for future performance "People are starting to look beyond the valley to the next six to nine months when IT spending will return," says Christopher Penny, an analyst at Friedman, Billings, Ramsey. "They're looking at what EDS, IBM and other large companies have been able to do," favoring companies with a positive track record servicing established enterprises, Penny says. Is the IT industry in a rebound? That type of sentiment drove our Partner Index up 6 percent for the week ended April 26. Winners included Proxicom, whose shares doubled amid merger rumors on Wall Street. As we went to press, Compaq Computer confirmed plans to purchase Proxicom for $266 million. Meanwhile, EDS reported its eighth consecutive quarter of double-digit earnings growth. Q1 revenues rose 17 percent to $5 billion. "EDS has seen no slowdown in [its] overall market," says Dick Brown, chairman and CEO. "Companies around the world are continuing to invest in the information technology segments we serve to boost their productivity." Analysts are impressed with EDS's performance. "We are on the cusp of a new outsourcing wave and expect EDS to continue to profitably take share," says Mark Wolfenberger, an analyst at Credit Suisse First Boston. Tanning Technology and Scient also reported results last week. Tanning met its reduced Q1 expectations, reporting $13 million in revenue and a net loss of 11 cents per share, as did Scient, with $27.1 million in revenue and a $1.31 loss per share. USInternetworking reported $36.7 million in revenue and a 33-cent-per-share loss, and an nounced that it would lay off 20 percent to 25 percent of its staff and cut other expenses. "We are not immune to the conditions affecting virtually everyone in the technology industry," says CEO Andrew Stern. Other companies were even less successful. Digitas disappointed Wall Street when it reported revenues of $77.1 million and earnings of 3 cents a sharewhich failed to meet expectationsand revised downward its future forecast. ELoyalty didn't wait to disappoint investors. A week before a scheduled earnings call, the company cut its Q1 revenue expectations by 26 percent. So much for a complete rebound.