Characterization of clays and clay–organic systems. Cation diffusion and dehydroxylation

1986 ◽  
Vol 82 (2) ◽  
pp. 545 ◽  
Author(s):  
D. Tilak B. Tennakoon ◽  
John M. Thomas ◽  
William Jones ◽  
T. Adrian Carpenter ◽  
Subramaniam Ramdas
Keyword(s):  
Cation Diffusion ◽  
Organic Systems

The characterization of clay-organic systems

Clay Minerals ◽  
1982 ◽  
Vol 18 (4) ◽  
pp. 357-371 ◽  
Author(s):  
D. T. B. Tennakoon ◽  
R. Schlögl ◽  
T. Rayment ◽  
J. Klinowski ◽  
W. Jones ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Catalytic Properties ◽  
Clear Distinction ◽  
Organic Systems ◽  
Catalytically Active ◽  
Natural Clays ◽  
Temperature Controlled ◽  
C Nmr

AbstractThe importance of a number of techniques (including1H and13C NMR, XRD and IR) in exploring the important catalytic properties of synthetic and natural clays is described. A clear distinction is observed between proven catalytically-active clays (e.g. Al-exchanged) and those which are generally less effective (e.g. Na-exchanged).13C NMR spectroscopy is used to identify directly products formed within the interlayer regions, and temperature-controlled powder XRD serves as a useful tool for identifying whether or not intercalation occurs under variously defined conditions. High-pressure XRD is used to verify the formation of different products during reaction.

Photoelectrical characterization of photorefractive organic systems

1999 ◽  
Author(s):  
Stephan J. Zilker ◽  
M. Grasruck ◽  
Andre Leopold ◽  
Uwe Hofmann ◽  
M. A. Kol'chenko ◽  
...  
Keyword(s):  
Organic Systems

scholarly journals Functional Expression Cloning and Characterization of SFT, a Stimulator of Fe Transport

1997 ◽  
Vol 139 (4) ◽  
pp. 895-905 ◽  
Author(s):  
Jesus A. Gutierrez ◽  
Jianming Yu ◽  
Susan Rivera ◽  
Marianne Wessling-Resnick
Keyword(s):  
Membrane Transport ◽  
Untranslated Region ◽  
Xenopus Oocytes ◽  
Functional Expression ◽  
Expression Cloning ◽  
Cation Diffusion ◽  
Recycling Endosomes ◽  
Fe Uptake ◽  
Stimulation Of

A stimulator of Fe transport (SFT) was identified by functional expression cloning in Xenopus oocytes. SFT-mediated transport has properties defined for transferrin-independent Fe uptake, but its cytolocalization in recycling endosomes and the observed stimulation of transferrin-bound Fe assimilation indicate a key role in intracellular Fe membrane transport as well. SFT has six predicted transmembranous domains and a functionally important RExxE motif that resembles domains involved in yeast Fe transport and Fe-binding by ferritin L-chains. The observation that SFT oligomerizes, along with other structural and mechanistic features, suggests it may be a member of either the ATP-binding cassette or cation diffusion facilitator families. The 3′ untranslated region of SFT contains a translation inhibitory element and inhibition of SFT expression in Xenopus oocytes was found to be relieved by coinjection of transcripts from other defined cDNAs that are also described in this report. SFT is the first component of the mammalian Fe membrane transport machinery to be identified.

scholarly journals Characterization of Binary Organogels Based on Some Azobenzene Compounds and Alkyloxybenzoic Acids with Different Chain Lengths

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Yongmei Hu ◽  
Qingshan Li ◽  
Wei Hong ◽  
Tifeng Jiao ◽  
Guangzhong Xing ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Alkyl Substituent ◽  
Morphological Characterization ◽  
Hydrophobic Force ◽  
Multilayer Nanostructures ◽  
Textile Materials ◽  
Alkyl Chains ◽  
Organic Systems ◽  
Chain Lengths

In this work the gelation behaviors of binary organogels composed of azobenzene amino derivatives and alkyloxybenzoic acids with different lengths of alkyl chains in various organic solvents were investigated and characterized. The corresponding gelation behaviors in 20 solvents were characterized and shown as new binary organic systems. It showed that the lengths of substituent alkyl chains in compounds have played an important role in the gelation formation of gelator mixtures in present tested organic solvents. Longer methylene chains in molecular skeletons in these gelators seem more suitable for the gelation of present solvents. Morphological characterization showed that these gelator molecules have the tendency to self-assemble into various aggregates from lamella, wrinkle, and belt to dot with change of solvents and gelator mixtures. Spectral characterization demonstrated different H-bond formation and hydrophobic force existing in gels, depending on different substituent chains in molecular skeletons. Meanwhile, these organogels can self-assemble to form monomolecular or multilayer nanostructures owing to the different lengths of due to alkyl substituent chains. Possible assembly modes for present xerogels were proposed. The present investigation is perspective to provide new clues for the design of new nanomaterials and functional textile materials with special microstructures.

Characterization of a Glomus intraradices gene encoding a putative Zn transporter of the cation diffusion facilitator family

2005 ◽  
Vol 42 (2) ◽  
pp. 130-140 ◽  
Author(s):  
Manuel González-Guerrero ◽  
Concepción Azcón-Aguilar ◽  
Michelle Mooney ◽  
Ascensión Valderas ◽  
Colin W. MacDiarmid ◽  
...  
Keyword(s):  
Glomus Intraradices ◽  
Cation Diffusion ◽  
Gene Encoding ◽  
Cation Diffusion Facilitator ◽  
Cation Diffusion Facilitator Family

Synthesis & Characterization of Optically-Active Lanthanide-Doped Hybrid Inorganic-Organic Systems

1999 ◽  
Vol 576 ◽  
Author(s):  
R.E. Taylor-Smith ◽  
K. M. Choi
Keyword(s):  
Sol Gel ◽  
Systems Design ◽  
Optically Active ◽  
Materials Chemistry ◽  
Active Systems ◽  
Organic Systems ◽  
Bridged Silsesquioxane ◽  
Molecular Composites ◽  
Rare Earth Doped

ABSTRACTThe materials chemistry of sol-gel-derived inorganic-organic molecular composites offers significant potential for molecular-level systems design. One focus in this arena is the chemical design and microstructural engineering of optically-active systems. We report the generation of rare-earth-doped inorganic-organic hybrids, based on a bridged polysilsesquioxane architecture. Derived from lanthanide precursors such as Erbium isopropoxide, which we co-condense with the requisite silsesquioxane monomer, these systems exhibit significant optical activity. In experiments on hybrids doped with Erbium, we conclusively demonstrate strong fluorescence at wavelengths in the vicinity of 1540 nm, from stimulation with 488 nm radiation. We discuss materials-driven impacts of the bridged-silsesquioxane architecture on system complexities arising from the solution sol-gel route which would affect fluorescence efficiencies and luminescence levels, such as hydroxyl impurities and clustering-effects.

scholarly journals Identification and Characterization of a Major Zn(II) Resistance Determinant of Mycobacterium smegmatis

2006 ◽  
Vol 188 (19) ◽  
pp. 7026-7032 ◽  
Author(s):  
Amit Grover ◽  
Rakesh Sharma
Keyword(s):  
Mycobacterium Smegmatis ◽  
In Silico Analysis ◽  
Zinc Ion ◽  
Cation Diffusion ◽  
Cation Diffusion Facilitator ◽  
Transposon Insertion ◽  
Gene Coding ◽  
Family Protein ◽  
Opportunistic Pathogenic

ABSTRACT A zinc ion-sensitive mutant of Mycobacterium smegmatis was isolated. The transposon insertion was located in zitA (MSMEG0750), a gene coding for a cation diffusion facilitator family protein. Zinc ions specifically induced expression of zitA. In silico analysis revealed that environmental and opportunistic pathogenic species contain higher numbers of cation diffusion facilitator genes than do obligate pathogens.

scholarly journals Characterization of two cation diffusion facilitators NpunF0707 and NpunF1794 in Nostoc punctiforme

2015 ◽  
Vol 119 (5) ◽  
pp. 1357-1370 ◽  
Author(s):  
L. Hudek ◽  
L. Pearson ◽  
A.A. Michalczyk ◽  
L. Bräu ◽  
B.A. Neilan ◽  
...  
Keyword(s):  
Nostoc Punctiforme ◽  
Cation Diffusion ◽  
Cation Diffusion Facilitators

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

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