TITLE

Pressure and pH dependence of the structure of a fatty acid monolayer with calcium ions in the subphase

AUTHOR(S)
Shih, M. C.; Bohanon, T. M.; Mikrut, J. M.; Zschack, P.; Dutta, P.
PUB. DATE
January 1992
SOURCE
Journal of Chemical Physics;1/15/1992, Vol. 96 Issue 2, p1556
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have studied the effect of pressure and pH on Langmuir monolayers of heneicosanoic acid in the presence of calcium ions in the subphase. At very low pH the monolayer is unaffected by calcium ions; as the pH is increased, the head groups are pulled closer together and the chain tilt at zero pressure decreases. As a result, the phase transitions seen along the isotherms occur at lower pressures. When the isotherms become featureless, the chains are untilted at all pressures. At very high pH, a new untilted structure is observed.
ACCESSION #
7632486

 

Related Articles

  • Ca2+ solvation as a function of p, T, and pH from ab initio simulation. Adeagbo, Waheed A.; Doltsinis, Nikos L.; Burchard, Michael; Maresch, Walter V.; Fockenberg, Thomas // Journal of Chemical Physics;9/28/2012, Vol. 137 Issue 12, p124502 

    First principles molecular dynamics simulations have been carried out at various temperatures and pressures starting with either Ca2+ or CaO in a reactive volume of 63 H2O molecules. In the case of aqueous Ca2+, the ion is surrounded by six H2O molecules in the first hydration shell at 300 K/0.3...

  • The Hemocyanin of the Shamefaced Crab Calappa granulata: Structural-Functional Characterization. Olianas, Alessandra; Sanna, Maria T.; Messana, Irene; Castagnola, Massimo; Masia, Daniela; Manconi, Barbara; Cau, Angelo; Giardina, Bruno; Pellegrini, Mariagiuseppina // Journal of Biochemistry;Jun2006, Vol. 139 Issue 6, p957 

    Arthropod hemocyanins (Hcs) transport and store oxygen and are composed of six subunits, or multiples thereof depending on the species. Calappa granulata Hc is found as a mixture of dodecamers (95%) and hexamers (5%). Removal of calcium ions and alkaline pH induce an incomplete partially...

  • Effects of intracellular pH and Ca2+ on the activity of stretch-sensitive cation channels in leech neurons. Barsanti, C.; Pellegrini, M.; Ricci, D.; Pellegrino, M. // Pflugers Archiv European Journal of Physiology;Jul2006, Vol. 452 Issue 4, p435 

    The effects of intracellular pH and calcium on the activity of the leech mechanosensitive cation channels have been studied. These channels exhibited two activity modes denoted as spike-like (SL) and multiconductance (MC). In the absence of mechanical stimulation, acidification of the...

  • In Vitro Fermentation of Dietary Carbohydrates Consumed by African Apes and Monkeys: Preliminary Results for Interpreting Microbial and Digestive Strategy. Lambert, Joanna; Fellner, Vivek // International Journal of Primatology;Feb2012, Vol. 33 Issue 1, p263 

    Primates derive significant nutritional benefits from hosting symbiotic, fermenting microbes in their gut, including the provision of energy from short-chain fatty acids (SCFAs). We measured fermentation parameters in fecal samples of 4 hindgut fermenting species ( Gorilla gorilla, Pan...

  • The Rate of Change of a Soil Bacterial Community after Liming as a Function of Temperature. Pettersson, M.; Bååth, E. // Microbial Ecology;Aug2003, Vol. 46 Issue 2, p177 

    The response of a bacterial community to liming of a forest humus soil (pH 4.9 increased to pH 7.5) was studied in the laboratory at three temperatures (5, 20, and 30°C). As a comparison an unlimed soil (pH 4.9) and a soil limed in the field 15 years ago (pH around 6) were also included. The...

  • Lihuaxuella thermophila gen. nov., sp. nov., isolated from a geothermal soil sample in Tengchong, Yunnan, south-west China. Yu, Tian-Tian; Zhang, Bing-Huo; Yao, Ji-Cheng; Tang, Shu-Kun; Zhou, En-Min; Yin, Yi-Rui; Wei, Da-Qiao; Ming, Hong; Li, Wen-Jun // Antonie van Leeuwenhoek;Nov2012, Vol. 102 Issue 4, p711 

    A novel filamentous bacterium, designated YIM 77831, was isolated from a geothermal soil sample collected at Rehai National Park, Tengchong, Yunnan province, south-west China. Growth occurred from 28 to 65 °C (optimum 50 °C), pH 6.0-8.0 (optimum pH 7.0). The strain formed branched...

  • A two-enzyme system for the transformation of unsaturated oils to 9(S)-hydroperoxy fatty acids. Gargouri, Mohamed; Dominique Legoy, Marie // Biotechnology Letters;Jun2002, Vol. 24 Issue 11, p915 

    A two-enzyme system involving a lipase from a Pseudomonas sp. and an extract of potato tubers containing lipoxygenase was used to convert triacylglycerols to 9-hydroperoxy fatty acids. Highest yields (up to 25%) were obtained with 1 to 20 g l-1 trilinolein as substrate after 5 h under O2 at pH 6...

  • Effect of CaCl2 on Chemical Properties of Mineral Trioxide Aggregate. Stavileci, Miranda; Hoxha, Veton; Kamberi, Blerim; Vula, Violeta; Bajrami, Donika; Kameri, Ariana // Acta Stomatologica Croatica;2008, Vol. 42 Issue 2, p171 

    MTA has been proposed for various treatment alternatives due to its high biocompatibility. However delayed setting times may limit its use. Objectives: The aim of this study was to evaluate the effect of adding a setting accelerator 5% or 10% CaCl2 to MTA on the pH and calcium ion release of MTA...

  • Enamelysin (Matrix Metalloproteinase-20): Localization in the Developing Tooth and Effects of pH and Calcium on Amelogenin Hydrolysis. Fukae, M.; Tanabe, T.; Uchida, T.; Lee, S.-K.; Ryu, O.-H.; Murakami, C.; Wakida, K.; Simmer, J. P.; Yamada, Y.; Bartlett, J. D. // Journal of Dental Research;Aug1998, Vol. 77 Issue 8, p1580 

    The formation of dental enamel is a precisely regulated and dynamic developmental process. The forming enamel starts as a soft, protein-rich tissue and ends as a hard tissue that is over 95%f mineral by weight. Intact amelogenin and its proteolytic cleavage products are the most abundant...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics