Materials Literature
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One approach to tissue-engineering combines isolated cells with polymer scaffolds for the purpose of generating new tissue or tissue equivalents. It has met with much success when applied to the formation of new cartilage (neo-cartilage). In this review, we will examine the development of polyglycolic acid fiber meshe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDipole Moments, Energetic Disorder, and Charge Transport in Molecularly Doped PolymersRalph H. Young, John A. Sinicropi, and John J. FitzgeraldCite this: J. Phys. Chem. 1995, 99, 23, 9497–9506Publication Date (Print):June 1, 1995Publication History Published online1 May 2002…
The role of fiber moisture sorption behavior in the sensory perception of dampness in fabrics has been investigated both experimentally and mechanistically. The way in which water is held in fabrics influences the thermal transients that occur during skin contact. Fabrics with water content in excess of the equilibriu…
Radiolabelled glucose was added to a batch culture of Alcaligenes eutrophus during the accumulation of poly(3-hydroxybutyrate) (PHB) to label newly synthesized polymer. The specific radioactivity of the polymer continued to increase, by approximately 30%, after the cessation of PHB accumulation, indicating that turnov…
Abstract Crystallization from the melt of nylon 66 in the presence of carbon fiber, aramid fiber, or nucleating agent was studied using differential scanning calorimetry (DSC) and hot stage microscopy. The use of the nucleating agent resulted in an increase in crystallization rate and a decrease of induction time unde…
Ni-α-Al2O3 metal-ceramic composites with metal loadings ranging from 33 to 67 vol.% were synthesized via a sol-gel (both polymeric and colloidal) technique. The polymeric route involves introducing nickel formate during the hydrolysis and condensation of aluminum isopropoxide while the colloidal route involves precipi…
The effects of oxidation in air and corrosion in high‐temperature, high‐pressure water on the mechanical properties of three commercially available amorphous Si‐Ti‐C‐O (Tyranno) fibers with different oxygen contents (12%–18%) and diameters (8–11 μm) were investigated. The fibers were exposed to isothermal treatments a…
Aqueous mixtures of zirconium acetate and aluminum nitrate were pyrolyzed and crystallized to form a metastable solid solution, Zr 1‐ x Al x O 2− x /2 ( x < 0.57). The initial, metastable phase partitions at higher temperatures to form two metastable phases, viz., t −ZrO 2 +γ‐Al 2 O 3 with a nano‐scale microstructu…
The crystal structures of a synthetic H-bearing aluminous stishovite, containing approximately 1.6 wt% Al<sub>2</sub>O<sub>3</sub>, and a pure-silica stishovite have been refined from three-dimensional, single-crystal X-ray diffraction data. The space group of both is P4<sub>2</sub>/mnm, and the unit cell parameters o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFrequency-Dependent Second-Order Hyperpolarizability of Carbon Clusters: A Semiempirical InvestigationMarianna Fanti, Giorgio Orlandi, and Francesco ZerbettoCite this: J. Am. Chem. Soc. 1995, 117, 22, 6101–6108Publication Date (Print):June 1, 1995Publication History Publishe…
Abstract : Smectite genesis in two granitic saprolites was studied, using qualitative and quantitative mineralogical methods and high resolution transmission electron microscopy (HRTEM). The primary minerals (plagioclase and mica) give rise to the formation of different kinds of smectites according to the weathering c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermolysis and Methanolysis of Poly(.beta.-hydroxybutyrate): Random Scission Assessed by Statistical Analysis of Molecular Weight DistributionsRoy Lehrle, Robert Williams, Christopher French, and Tim HammondCite this: Macromolecules 1995, 28, 13, 4408–4414Publication Date (…
Equilibrium unfolding of barstar with guanidine hydrochloride (GdnHCl) and urea as denaturants as well as thermal unfolding have been carried out as a function of pH using fluorescence, far-UV and near-UV CD, and absorbance as probes. Both GdnHCl-induced and urea-induced denaturation studies at pH 7 show that barstar…
Within minutes of removal from the California mussel, Mytilus californianus hemocytes become sticky for one another and for foreign surfaces. We sought to understand the cell surface changes responsible for this altered state. Hemocyte aggregation and adhesion assays were used in experiments in which a variety of reag…
Heterologous expression of recombinant proteins in E. coli often results in the formation of insoluble and inactive protein aggregates, commonly referred to as inclusion bodies. To obtain the native (i.e., correctly folded) and hence active form of the protein from such aggregates, four steps are usually followed: (1)…
A theory of moisture absorption in clothing, with the associated effects of heat transfer, was developed and applied in a computer model. The model considers the body, underclothing, an outer layer, and the adjacent air layer. The theory was checked with an experiment involving four subjects. They wore heavy woollen c…
A cyclic core is not essential for mesomorphism. But just how flexible, or “open” can be central units in a branched compound be before liquid crystallinity is no longer exhibited? Here, the influence on the substitution patterns and in particular of hydrogen bonding in the title compounds is examined and it is found…
Vortex rings are seen to form when dyed water drops strike a water surface and their formation and structure depend on height of fall and surface tension. The assumption that a vortex sheet envelopes the penetrating drop, frequently stated without explanation in the literature, does not explain these factors and this…
Some aminoester organic compounds were tested as corrosion inhibitors for iron in molar hydrochloric acid (HCl) by mass-loss and electrochemical polarization methods. Both techniques gave the same order of inhibition. Comparison of results among those aminoesters showed L-methionine methyl ester (METOCH3) was the best…
Three series of novel chiral twin liquid crystals consisting of a cholesteryl and a 4′-cyanobiphenyl-4-yloxy group (III) or a 4-cyanophenoxy group (IV) and of a dihydro-cholesteryl and a 4′-cyanobiphenyl-4-yloxy group (V) connected by an alkanoate spacer with a varying number (1–7 and 10) of methylene units were synth…