Search Results - (Author, Cooperation:S. M. Andrews)

2013-02-01

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

2013-07-23

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

2015-04-10

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

1476-4687

Nature Archives 1869 - 2009

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

[Auszug] All these strata belong to the Limestone Coal Group which forms the lowest subdivision of the Namurian Series (lower Namurian A) in Scotland. In the Dora area this subdivision is about 330m thick. A measured section (Fig. 2) at the locality indicates the position of the bone bed about 62 m beneath ...

Electronic Resource

0887-624X

Chemistry ; Polymer and Materials Science

Wiley InterScience Backfile Collection 1832-2000

Chemistry and Pharmacology

Novel polypyrazolinones with inherent viscosities ranging from 0.12 to 0.44 dL/g were prepared by the Michael-type nucleophilic addition-cyclization of various dihydrazines with 3,3′-(1,3- or 1,4-phenylene)bis(ethyl propynoate) (1,3- or 1,4-PEP) and 3,3′-(1,4-phenylene)bis(phenyl propynoate) (1,4-PPhP) in N-methylpyrrolidone (NMP) solution at 25-110°C. The polymers exhibited moderate thermal stability with initial weight loss in air about 200°C and in nitrogen about 300°C (TGA). No apparent Tg′s were observed by DSC analysis. The synthesis and characterization of the polypyrazolinones is discussed.

1 Ill.

Electronic Resource

0887-624X

poly(arylether sulfone)s ; poly(aryl sulfone)s ; polymer blends ; Chemistry ; Polymer and Materials Science

Wiley InterScience Backfile Collection 1832-2000

Chemistry and Pharmacology

The preparation of poly(4-oxy-1,4-phenylenesulfonyl-4,4′-biphenylene-4-sulfonylphenylene) (PBP) has been accomplished by the base mediated, polycondensation reaction between two biphenyl containing monomers. The bisphenol, 4,4′-bis[(4-hydroxyphenyl) sulfonyl]biphenyl (HSB), was reacted with 4,4′-bis[(4-chlorophenyl)sulfonyl]-biphenyl (CSB) in tetramethylene sulfone solvent. The highest mechanical properties and glass transition temperature was observed for polymer PBP with a reduced viscosity around 1.0 dL/g. Consequently, the current synthesis route provides polymer with higher properties than other historical preparative routes. Blends of PBP with a different poly(ether sulfone) were miscible based on the observance of a single glass transition temperature. The Tgs of the polymer blends exhibited an unusual positive deviation from the weighted linear averages of the components.

2 Ill.

Electronic Resource

1573-2932

Springer Online Journal Archives 1860-2000

Energy, Environment Protection, Nuclear Power Engineering

Abstract The total body concentrations of Pb, Cd, and fluoride were higher at the contaminated grassland site established on fluorspar tailings compared to an uncontaminated control site for all three species of small mammal, Apodemus sylvaticus, Microtus agrestis and Sorex araneus. Zn was also higher in M. agrestis and S. araneus but in A. sylvaticus it significantly decreased and, overall, there was good evidence of homeostatic control of Zn in all three species even at the high dietary intakes at the tailings dam. Accumulation in kidney, liver and bone(femur) showed the expected pattern with Pb and fluoride highest in bone and Cd in the kidney for both the control and the contaminated sites. The only exception was S. araneus at the contaminated site were Cd was highest in the liver rather than the kidney. The accumulation of Pb, Cd and fluoride at the contaminated site was in the decreasing species order S. araneus 〉 M. agrestis 〉 A. sylvaticus in terms of total body concentration or target organ concentration. This order probably reflected the decreasing dietary intake rates of the three species although physiological interspecific differences may be of significance. For example, S. araneus showed considerable capability for bioconcentrating Cd to much higher total body than dietary concentrations at the high dietary intake rates at the contaminated site.

Electronic Resource

1573-2932

Springer Online Journal Archives 1860-2000

Energy, Environment Protection, Nuclear Power Engineering

Abstract The concentrations of Pb, Zn, Cd, and fluoride were determined in liver, kidney and femur tissues 30 days after wood mice were provided with water containing soluble salts of these elements in their drinking water. There were eight treatment groups: Pb, Zn, Cd, and fluoride only; Zn and Cd (ZnCd); fluoride and Pb (FPb); fluoride, Pb, Zn, and Cd (FPbZnCd); and a control. Lead concentrations were highest in bone but were also significantly higher in the kidney but not liver when compared to the control. The highest kidney Pb levels were in the FPbZnCd treatment but they were not significantly higher than the Pb only group. Zinc concentrations were highest in kidney and not femur as is usually the case in field caught animals. Cadmium was also highest in the kidney in the high Cd treatments, however, the ZnCd treatment group had significantly lower kidney Cd levels than the Cd only group demonstrating the antagonistic effect of high Zn on Cd accumulation. This effect was reversed when high fluoride and Pb were also present (in the FPbZnCd group) and the kidney Cd reached its highest level. Fluoride showed the typically high levels in bone with only the combined treatment (FPbZnCd) showing a significant increase in kidney fluoride. These results are discussed in terms of the accumulation in wild small mammals caught in polluted sites particularly grasslands established on fluorspar wastes.

Electronic Resource