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Zinc-65 uptake by a bacterium isolated from Alder Slough, Columbia River EstuaryTonjes, Stephen Dodd 29 January 1971 (has links)
Bacteria were isolated from water at Alder Slough, Oregon. Of
15 isolates grown successfully in the medium employed, 100% showed
measurable uptake of Zn-65. A growth curve was established for one
isolate, a gram-negative rod designated AS-1. Increasing Zn-65 uptake
was found generally to correspond with increasing growth of
AS-1. The optimum growth temperature for this isolate was 31°C,
with very little growth at 37.5°C and 6.7°C. Growth and Zn-65 uptake
occurred in a 35 ppt medium from a temperature of 31.0°C to
13.9°C but little growth and no Zn-65 uptake was observed at 8.6°C
and 4.4°C. Growth and Zn-65 uptake in a 0 ppt medium occurred
from 31.0°C to 5.0°C, with little growth but measurable Zn-65 uptake
at 8.9°C and 5.0°C.
It was found that 200 ppm Mg added to a culture which had
already taken up Zn-65 failed to displace the zinc from the cells. A
interaction of the energy source, Casamino Acids, with the Zn-65
spike influenced the results. When cells were lysed, spiked with
Zn-65, and the debris removed by centrifugation, 84.8% of the Zn-65
remained in the supernatant. But when cells grown first in Zn-65
spiked medium were lysed and centrifuged, 74.4% of the Zn-65 was
found in the debris.
It was concluded that bacterial uptake of Zn-65 and other metal
cations must be considered in determining the fates of these materials
released into the environment. Chemical adsorption phenomena were
determined to be a major factor controlling this uptake, with other
chemical and biological factors, such as competitive binding by the
medium and active uptake or exclusion by the cells, exerting a
significant influence that requires further investigation to characterize. / Graduation date: 1971
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Indium donor complexes with native point defects in zinc selenideLundquist, Randy 07 March 1994 (has links)
Graduation date: 1994
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Isolation, purification, and characterization of zinc-induced, metal-binding protein from liver of rainbow trout (Salmo gairdneri) /Pierson, Keith B. January 1983 (has links)
Thesis (Ph. D.)--University of Washington, 1983. / Vita. Bibliography: leaves [59]-65.
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Ectopic Expression of Copper-Zinc Superoxide Dismutase Attenuates the Tumorigenicity of SK-Hep-1 Hepatoma CellsLin, I-Chun 28 August 2007 (has links)
Hepatocellular carcinoma (HCC) is one of the most prevalent cancers in
Taiwan. Copper-zinc superoxide dismutase (SOD1) is widely distributed and
comprises 90% of the total superoxide dismutase (SOD), which catalyzes the
conversion of superoxide to hydrogen peroxide. Reduced expression of
antioxidant enzymes, particularly SOD1, has been identified in human
hepatoma specimens and cell lines. However, it remains unclear how SOD1
expression affected the tumorigenic processes of hepatoma cells. Expression
analysis of an array of human HCC cell lines revealed that SOD1 protein
levels were down regulated in poorly differentiated SK-Hep-1 cells.
Adenovirus-mediated SOD1 expression increased the SOD1 protein level by
30-40% of control. In addition, SOD1 gene transfer decreased the cellular
O2
¡V level yet increased the H2O2 production. SOD1 overexpression
significantly reduced the proliferation, motility, and anchorage-independent
growth of SK-Hep-1 cells, but had no effect on the secretion of matrix
metalloproteinase-2 (MMP-2) and MMP-9. SOD1 restoration inhibited the
proliferation of SK-Hep-1 cells through induction of cell cycle arrest, which
was associated with decreased expression of cyclin A, cyclin D1, cdk1, cdk4
and upregulation of p21Cip1 and p27kip1. Besides, SOD1 overexpression also
inhibited the nuclear factor £e B (NF-£eB) activities, thereby attenuating the
proliferation and migration of SK-Hep-1 cells. In conclusion, SOD1
restoration attenuated the tumorigenicity of hepatoma cells.
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Synthesis and Structural Study of Zinc and Cadmium Thiolate Complexes with Sulfur Rich Coordination EnvironmentChang, Po-Chiang 02 September 2011 (has links)
We have successfully synthesized the zinc and cadmium complexes containing bis(3-trimethylsilyl-2-thiophenyl)phenylphosphine (SiPS2): [NEt4][(SiPS2)Cd(SC6H5)] (1) , [NEt4][(SiPS2)Cd(SC6H11)] (2) , [NEt4][(SiPS2)Cd(SCH2C6H5)] (3) , [NEt4][(SiPS2)Zn(SC6H5)] (4) , [NEt4][(SiPS2)Zn(SC6H11)] (5) and [NEt4][(SiPS2)Zn(SCH2C6H5)] (6) , and characterized them using 31P NMR and mass spectrum.1 and 2 were also characterized by X-ray diffraction methods.
In the attemprs to get crystals of 4 and 6, we got the oxidized dimer complex 4* and 6* instead. In these complexes the two oxygen atoms of the oxidized ligands and the sulfur atom of the monodentate thiolate ligand bridge both the cadmium centers.
Zinc complexes exhibit distorted tetrahedral structure. However, the cadmium ion tends to form five coordination oxidation dimeric complexes.
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The Interactions and Exchanges of Metal-bound Sulfur Containing Ligands with Various Transition MetalsFoley, William 2009 December 1900 (has links)
The treble clef binding motif of the zinc finger metalloprotein utilizes N2S2 binding sites. Whereas other N2S2 metalloproteins function in catalytic roles, zinc fingers serve mostly a structural element, although there has been some evidence that the zinc finger protein can interact with exogenous metal ions in aggregate formation or ion exchange. The work presented within has been aimed at precedents for both of the latter in Zn2+.
The use of zinc and cadmium dithiolate complexes as mono- and bidentate S-donor ligands to tungsten carbonyl complexes was explored and the ability of zinc and cadmium complexes to stably bind to W(CO)x (x = 4 and 5) was established. The reactivity of thiolate sulfurs within the bimetallic complexes was examined, gaining an understanding of zinc and cadmium N2S2. The characteristics of these complexes were examined via IR, UV-vis, elemental analysis, and x-ray crystallography spectroscopy.
The ability of zinc to act as a scaffold for the synthesis of bisacetylbme-dach in the production and subsequent transfer of the same ligand to exogenous metal ion sources was investigated. Cu2+ and Cd2+ analogs to the Zn-1’-Ac2 were synthesized and their properties investigated with IR, elemental analysis, and UV-vis spectroscopy.
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The Anion Effect on the Reaction between Zinc Ion and IminophosphinesLin, Huey-Jen 20 June 2001 (has links)
none
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Investigation zinc oxide thin film and doped alumiunm thin film prepared by reactive sputteringHuang, Hsiu-tse 19 July 2003 (has links)
none
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Maladie de Verneuil et zinc une nouvelle approche thérapeutique /Brocard, Anabelle Dréno, Brigitte. January 2005 (has links) (PDF)
Thèse d'exercice : Médecine. Dermatologie - Vénéréologie : Université de Nantes : 2005. / Bibliogr. f. 89-98 [115 réf.].
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Fabrication and characterization of one dimensional ZnO nanostructures /Cheng, Chun. January 2009 (has links)
Includes bibliographical references (p. 136-150).
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