Materials Literature
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The photosensitized degradation of poly(L-lactic acid) (PLA) via an anionic reaction process was studied using spectrophotometry, electron spin resonance (ESR), and gel permeation chromatography (GPC) measurements. PLA film doped with N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) was irradiated at 77 K using UV ligh…
The blood compatibility of poly(ethylene oxide) (PEO)-grafted and heparin (Hep) immobilized polyurethanes was investigated using in vitro plasma recalcification time (PRT), activated partial thromboplastin time (APTT), platelet adhesion and activation, and peripheral blood mononuclear cell (PBMC) adhesion and activati…
The lyophilized decoction of Salvadora persica L. roots possesses a significant protective effect on ulceration induced by ethanol, indomethacin and cold restraint stress in rats. In this work, we study the effect of chronic intragastric administration of S. persica decoction on experimental acetylsalicylic acid (ASA)…
An experimental charge density investigation of 7,7-di[(S)-(+)-2-(methoxymethyl)pyrrolidino]-8,8-dicyanoquinodimethane establishes the presence of a large charge separation as well as a high in-crystal dipole moment compared to the free molecule in frozen geometry, consistent with the high SHG activity of the compound.
The synthesis, characterization and mesomorphic properties of five series of copper(I) isocyanide complexes [CuCl(CNR)] [R = C6H4C6H4OCnH2n + 1 (LA), C6H4OOCC6H4OCnH2n + 1 (LB), C6H4COOC6H4OCnH2n + 1 (LC), C6H3{3,4-(OCnH2n + 1)2} (LD), C6H2{3,4,5-(OCnH2n + 1)3} (LE); n = 4, 6, 8, 10, 12] are described. Although some o…
BACKGROUND: The activity of the combination of carboplatin and liposomal doxorubicin was tested in a Phase II study of patients with recurrent cervical carcinoma. METHODS: The combination of carboplatin (area under the concentration curve [AUC], 5) and liposomal doxorubicin (Doxil; starting dose, 40 mg/m(2)) was admin…
A method for scanning electron microscopy imaging of nonconductive specimens, based on measurement and utilisation of a critical energy, is described in detail together with examples of its application. The critical energy, at which the total electron yield curve crosses the unit level, is estimated on the basis of me…
Complexes of a commercially available amino-functionalized polysiloxane and perfluorinated dodecanoic acid were prepared to form smooth surfaces which were highly oil- and water-repellent. The surfaces of the complexes were found to be highly enriched with CF3 groups, resulting in critical surface tensions as low as 6…
The graft copolymerization of styrene and acrylonitrile onto natural rubber was prepared by emulsion polymerization using potassium persulfate as an initiator. The effects of initiator concentration, reaction temperature, and pressure on monomer conversion and the grafting properties of natural rubber are investigated…
Soils contaminated with lead pose significant risk to human as well as terrestrial and aquatic ecosystems. Theoretical phase relationships and field observations suggest that the interaction of lead and phosphorus to form pyromorphites Pb5(PO4 )3 X (X= OH-, Br-, Cl-, or F-) is an important buffer mechanism controlling…
Porous silica-pillared montmorillonites were prepared by simultaneous intercalation of dodecylamine-TEOS [tetraethylorthosilicate, Si(OC2H5)4] into the H-montmorillonite and intragallery amine-catalyzed hydrolysis of TEOS. Mixtures of the H-montmorillonite, dodecylamine and TEOS at molar ratios of 1 : 2 : 15-30 and 1…
The calcification potential, biostability, and immunogenic response of materials intended for long-term in vivo use, such as in heart-valve bioprostheses, are essential components of device performance. Here we explore these properties in photooxidized porcine heart valves. To study immunological sensitization, we inj…
Steric protection of a trisilanol silsesquioxane (also referred to as a silasesquioxane) by one TBDMS group (SiMe2But) generated a new siloxanolate ligand, (c-C5H9)7Si7O9(OH)2(OTBDMS) 1, that allows only restricted access to a co-ordinated metal. Lithiation afforded the stable complex (c-C5H9)7Si7O9(OLi)2(OTBDMS), whi…
The development of efficient photo-induced DNA cleavage agents has been of particular interest for biomedical applications such as cancer photodynamic therapy (PDT). Toward this objective, we synthesized a series of cationic bis-porphyrins with various lengths of diamino alkyl linkage, N,N'-bis[4-[10,15,20-tris(1-meth…
A novel donor-type metal–dithiolene complex, Ni(edo)2 [edo = 5,6-dihydro-1,4-dioxine-2,3-dithiolate], and its mixed-ligand derivatives were synthesized and characterized. Their improved solubility and donor abilities have been confirmed. They provide various types of radical cation salts which exhibit novel donor arra…
We report an experimental study of the shape of large liquid drops spreading on surfaces with patterns of wettability. The patterns are sets of disks of a material less wettable than the rest of the plane substrate. When few defects are present, or when the average distance between defects is large compared to the cap…
Thermal properties and flammability behavior of two grades of fire retardant polypropylene and nylon 66, and their base resins were determined. A nylon 6 base polymer and a nano-composite based on that polymer were also analyzed. Thermal gravimetric analysis showed more complex degradation patterns for the fire retard…
Immobilization of the anticoagulative or antithrombogenic biomolecule has been considered as one of the important methods to improve the blood compatibility of artificial biomaterials. In this study, a novel immobilization reaction scheme was utilized to incorporate the human thrombomodulin, an endothelial cell associ…
This research investigated the structural changes that occur on different polyethylene polymer systems as a result of a novel pulverization process called solid-state shear pulverization (S3P). High-density polyethylene, low-density polyethylene, and two forms of linear low-density polyethylene were run through a pulv…
The photophysical properties and isomerization of 3,3′-diethylthiacarbocyanine (DTC) were studied in isooctane/sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/water reverse micelles and in aqueous solutions containing sodium dodecylsulfate (SDS), cetyltrimethylammonium bromide (CTAB) and chloride (CTAC) and Triton X-100…