Hypolipidemic effects of clofibrate and selected chroman analogs in fasted rats: I. Chow-fed animals

The hypolipidemic properties of ethyl 6-chlorochroman-2-carboxylate (II), ethyl 6-phenylchroman-2-carboxylate (III) and ethyl 6-cyclohexylchroman-2-carboxylate (IV) were compared to clofibrate (I) in fasted normolipidemic rats. The chroman analog II, like its parent compound, clofibrate, reduced serum and α-lipoprotein cholesterol concentrations. Although analog III had no effect on serum cholesterol, it caused a slight elevation of α-lipoprotein cholesterol concentration. Serum free cholesterol was increased and LCAT activity was reduced in clofibrate-treated rats. The hypolipidemic agents had no consistent effect on liver lipid concentrations and liver microsomal HMG-CoA reductase activity. In addition, we have shown that drug efficacies varied directly with seasonal variations in serum lipid concentrations.     

Thermal degradation of methoxyanisole-1,2-dichloroethane resins

Thermal behaviour of m-methoxyanisole-1,2-dichloroethane resins was studied at different heating rates. Kinetic parameters for the decomposition of the resins have been determined from TG and DTA studies using various methods of thermal analysis. The first stage of degradation had E₁ ～ 3, the second stage had E₂ ～ 28 and the overall degradation had E₁₂ ～ 36 kcal·mol^?1, respectively.     

New organic polymers,II. Synthesis and characterization of poly[3,3′-(6,6′-bis-(2-substituted-4-quinazolonediyl)) alkylene]s

Poly[3,3′-(6,6′-bis-(2-substituted-4-quinazolonediyl))alkylene]s have been synthesized by reacting 6,6′-bis-(2-R-3,1,4-benzoxazinone) (R = Me, Ph, and ? CH₂Ph) with aliphatic diamines H₂N(CH₂)_nNH₂ with n = 0, 2, 3, 4, 6 and 8 in m-cresol. These polymers are insoluble in all common organic solvents but are fairly soluble in concentrated sulfuric acid. The polymers were characterized by IR spectral study, viscometric measurements and thermal analysis. IR spectra of the polymer samples have been compared with those of their model compounds.     

Synthesis and characterization of poly(keto-amines). 2. Self-polycondensation of 4-methyl-3-aminophenacyl chloride and 2-methyl-4-aminophenacyl chloride

Poly(keto-amines) such as poly(4-methyl-3-iminophenacyls) and poly(2-methyl-4-iminophenacyls) were prepared by self-polycondensation of 4-methyl-3-aminophenacyl chloride and 2-methyl-4-aminophenacyl chloride under different experimental conditions. All the polymer samples were insoluble in common organic solvents. They were characterized by elemental analysis, IR spectral studies, estimation of M?_n by non-aqueous conductometric titration and study of thermal properties by DTA. The properties of P4M3IP and P2M4IP were compared with those of poly(4-iminophenacyls).     

Studies on physico-mechanical properties of some new light weight engineering materials

Industrial, agricultural, and naturally occurring waste materials in conjunction with liquid epoxy resin, silica and asbestos were employed to make light weight engineering composite materials. To bring down the cost of the expensive resin, additives such as linseed oil and urea formaldehyde were added to replace the bulk of epoxy resin. Various physico-mechanical properties of these composites were studied. In comparison with ordinary cement concrete, properties such as water absorption and fire resistance improved substantially for the majority of mixes, whereas other physico-mechanical properties did not improve greatly in many cases. Such composites, which are similar to (and in some cases better than) ordinary cement concrete can be of use in building technology because of substantially lower prices.     

3G与超3G:利用多核处理器优势实现卓越3G、WiMAX及LTE性能

如今,多内核处理器正日益成为解决蜂窝基站功率与性能难题的常用有效工具. 虽然无线领域中最受青睐的应用仍然是语音,但是数据正紧随其后,迅速成为热门的3G应用,而且随着运营商对诸如移动WiMAX(IEEE 802.16e)和长期演进(LTE)等4G技术的部署,数据的这种发展势头还将持续下去.在电子邮件、Web浏览、音乐下载以及机器对机器(M2M)的应用中,所有数据流量都会增加每个收发器基站(BTS)或节点B(Node B)的工作量,在城市地区尤为如此.     

Dark fermentative hydrogen production by defined mixed microbial cultures immobilized on ligno-cellulosic waste materials

Mixed microbial cultures (MMCs) based on 11 isolates belonging to Bacillus spp. (Firmicutes), Bordetella avium, Enterobacter aerogenes and Proteus mirabilis (Proteobacteria) were employed to produce hydrogen (H₂) under dark fermentative conditions. Under daily fed culture conditions (hydraulic retention time of 2 days), MMC6 and MMC4, immobilized on ligno-cellulosic wastes – banana leaves and coconut coir evolved 300–330 mL H₂/day. Here, H₂ constituted 58–62% of the total biogas evolved. It amounted to a H₂ yield of 1.54–1.65 mol/mol glucose utilized over a period of 60 days of fermentation. The involvement of various Bacillus spp. – Bacillus sp., Bacillus cereus, Bacillus megaterium, Bacillus pumilus and Bacillus thuringiensis as components of the defined MMCs for H₂ production has been reported here for the first time.     

Dechlorination of chlorophenols using magnesium-palladium bimetallic system

Ninety-four percent removal of 10 mg L(-1) of pentachlorophenol (PCP) was achieved by treatment with 154.5mM Mg(0) and 0.063 mM K(2)PdCl(6) in the presence of 175 mM acetic acid in 1h reaction time. Dechlorination of PCP was found to be sequential and phenol was identified as the end product along with accumulation of trace concentrations of tetra- and trichlorophenols. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) revealed that palladium in its metallic form (Pd(0)) produced by reduction of Pd4+, was spatially separated from magnesium granules when acid was included in the reaction. These colloidal palladium particles generated active reductive species of hydrogen and dechlorinated chlorophenols. In the absence of acid, the efficiency of dechlorination of PCP by Pd/Mg(0) system was very low and chief mechanism of removal of the compound was through sorption onto solid surfaces. Thus, it was important to include acid in the system to: (a) facilitate corrosion of Mg(0) and reduction of Pd4+ to Pd(0), (b) provision of protons to produce H2, (c) retard formation of insoluble oxides and hydroxides that may deposit on the magnesium granules and sorb PCP and its partially dechlorinated products and. Application of 154.5 mM Mg(0)/0.063 mM K(2)PdCl(6) on PCP, 2,4,5-trichlorophenol (TCP) and 2-chlorophenol (MCP) with organic chloride equivalence showed that the rate and extent of removal increased with decrease in number of chlorine atoms on phenol.     

Studies on swelling of cotton fibers in alkali metal hydroxides. I. Influence of variations in fine structure on tensile behavior

A study on cotton fibers swollen slack at ambient temperature in different concentrations of LiOH and KOH indicates that fibers swollen in KOH have higher disorder. Conversion to cellulose II results from swelling in both the reagents, although, with KOH swelling, it begins at a lower concentration. Further, retention of tenacity is higher at all gauge lengths after KOH swelling. Analysis of the influence of fine structure on tensile properties showed some specificity, mainly attributable to cationic size differences of the swelling agents.     

Physio-Chemical Characteristics and Fatty Acid Composition of Milk Fat of Surti Buffaloes I: Effect of Dietary Condition and Stage of Lactation

The effects of feeding concentrate mixture (21.3 % C. P.) and cotton seed (19.1 % C. P.) to four groups (each of three animals) of Surti buffaloes have been reported. Iodine value was higher for cotton seed fed group than that of concentrate mixture fed groups. Reverse trends were observed in case of R. M. value and P. value. Unsaturated fatty acid composition was found to increase when animals were fed cotton seed. Lower fatty acid composition increased in the case of animals fed concentrate mixture as main feeds.