Glasses in the NaPO3-WO3-NaF ternary system: preparation, physical properties and structural studies

Excess molar volumes and excess refractive indices of the n-octanol + 1,4-dioxane + 2-butanol system and the three corresponding binary mixtures have been determined at 298.15 K by measuring densities and refractive indices. Different expressions exist in the literature to predict these excess properties from binary data. An estimation of excess molar volumes is also evaluated using a modified Heller equation which depends on the refractive indices of the mixtures. A comparison of the predictions of different methods with the experimental values of the physical properties has been made.Key words: excess molar volumes, densities, refractive indices, n-octanol, 1,4-dioxane, 2-butanol, ternary system.

Download Full-text

Structural studies on the glycoproteins from bovine cervical mucus

Biochemical Journal ◽

10.1042/bj1730941 ◽

1978 ◽

Vol 173 (3) ◽

pp. 941-947 ◽

Cited By ~ 10

Author(s):

G P Roberts

Keyword(s):

Physical Properties ◽

Gel Electrophoresis ◽

Gel Filtration ◽

Cervical Mucus ◽

Cysteine Residues ◽

Structural Studies ◽

Disulphide Bonds ◽

Structural Differences ◽

Sepharose 4B

The depolymerization of bovine cervical glycoprotein resulting from cleavage of disulphide bonds. Pronase digestion and both procedures sequentially was assessed by using gel filtration. Cleavage of disulphide bonds followed by Pronase digestion produced more extensive depolymerization than did either treatment alone, and gel filtration of the products resulted in two major peaks of glycosylated material on Sepharose CL-2B and Sepharose 4B. The glycopolypeptides in both peaks had similar sugar and sulphate compositions, but they migrated to different extents on gel electrophoresis. Electrophoretic studies indicated that both glycopolypeptides were derived from the same glycoprotein molecule and not from a mixture of two similar glycoproteins. Pronase digestion of glycoproteins in which the disulphide bonds had been labelled with iodo-[1-14C]acetamide revealed that most of the cysteine residues were situated in regions susceptible to Pronase. The results show the presence of two types of structural regions in bovine cervical glycoprotein, namely ‘naked’ peptide or non-glycosylated regions and glycopolypeptide subunit regions in which glycopolypeptides of two different sizes predominate. Comparison of the cervical glycoproteins isolated from mucus secreted during oestrus and pregnancy, by the methods outlined above, did not reveal any structural differences in the glycoproteins to explain the different physical properties of the mucus secreted under these conditions.

Download Full-text

The Influence of Molding Powder Breakup on the Sintered Ceramic Quality

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.698.513 ◽

2014 ◽

Vol 698 ◽

pp. 513-518 ◽

Cited By ~ 4

Author(s):

Natalya Belousova ◽

Sergey Veselov ◽

Ruslan Kuzmin ◽

Elena Melnikova

Keyword(s):

Physical Properties ◽

Fractional Composition ◽

Ceramic Materials ◽

Structural Studies ◽

Sintered Ceramic ◽

Press Powder ◽

Molding Powder ◽

Different Types ◽

Properties Of Materials

This paper assesses the moldability of press-powder with different fractional composition. Different types of defects that occur in ceramic materials due to insufficient or overpressure of molding of press powderare analyzed. Based on results of structural studies and evaluation of the physical properties of materials recommendations on the molding selection modes of press-powders with different fractional composition that provide the absence of defects in the compacts and obtaining quality dense ceramics are formulated.

Download Full-text

Synthesis of new Ga7Ge3Te11—One-dimensional phase in Ga–Ge–Te ternary system: Crystal structure and physical properties

Journal of Solid State Chemistry ◽

10.1016/j.jssc.2014.11.013 ◽

2015 ◽

Vol 222 ◽

pp. 90-95 ◽

Cited By ~ 1

Author(s):

Cestmir Drasar ◽

Ivana Cisarova ◽

Vladimir Kucek ◽

Ludvik Benes ◽

Jan Prokleska ◽

...

Keyword(s):

Crystal Structure ◽

Ternary System ◽

Physical Properties ◽

One Dimensional

Download Full-text

Structural studies of organoboron compounds. XXXIII. 4,4-Dimethyl-2,2-diphenyl-1,3-dioxa-4-azonia-2-boratacyclohexaneand 3,3-dimethyl-2-phenoxy-2-phenyl-1-oxa-3-azonia-2-boratacyclopentane

Canadian Journal of Chemistry ◽

10.1139/v89-143 ◽

1989 ◽

Vol 67 (5) ◽

pp. 933-940 ◽

Cited By ~ 10

Author(s):

Eckardt Ebeling ◽

Wolfgang Kliegel ◽

Steven J. Rettig ◽

James Trotter

Keyword(s):

Physical Properties ◽

Crystal Structures ◽

Direct Methods ◽

Molecular Structures ◽

Structural Studies ◽

Boron Compounds ◽

Organoboron Compounds ◽

Thermally Induced ◽

Full Matrix ◽

Space Group

Details of the syntheses, physical properties, and crystal structures of the title compounds are reported. Crystals of 4,4-dimethyl-2,2-diphenyl-1,3-dioxa-4-azonia-2-boratacyclohexane, 3, are monoclinic, a = 6.512(1), b = 15.765(2), c = 14.342(4) Å, β = 93.170(7)°, Z = 4, space group Pn, and those of 3,3-dimethyl-2-phenoxy-2-phenyl-1-oxa-3-azonia-2-boratacyclopentane, 4, are orthorhombic, a = 13.5829(8), b = 16.940(1), c = 6.3181(4) Å, Z = 4, space group P21212. Both structures were solved by direct methods and were refined by full-matrix least-squares procedures to R = 0.034 and 0.034 for 1974 and 1478 reflections with I ≥ 3σ(I), respectively. The molecular structures are discussed in terms of the thermally-induced 1,2-migration of B-substituents by which 3 is converted to 4. Keywords: crystal structures, boron compounds, organoboron compounds.

Download Full-text

Speciation and transformation of Co(II)/Ni(II)–citrate–imidazole ternary system – synthesis, spectroscopic and structural studies

Journal of Inorganic Biochemistry ◽

10.1016/j.jinorgbio.2004.03.009 ◽

2004 ◽

Vol 98 (6) ◽

pp. 1110-1116 ◽

Cited By ~ 12

Author(s):

Yuan-Fu Deng ◽

Zhao-Hui Zhou ◽

Ze-Xing Cao ◽

Khi-Rui Tsai

Keyword(s):

Ternary System ◽

Structural Studies ◽

System Synthesis

Download Full-text