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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Promoter-induced enhancement of the crystallization rate of zeolites and related molecular sieves

Article Abstract:

The addition of ions such as perchlorate, phosphate, nitrate, sulphate and carbonate accelerates the crystallization rate of zeolites and related molecular sieves. The rate increases by five times on adding the promoter ions. The promoters increase the rate of formation of the oligomeric silicate ions. The silicate ions cause nucleation and growth of the crystals. A study shows an initial linear decrease in the crystallization time with increasing amounts of the promoter. The time remains constant after an optimum concentration.

Author: Kumar, Rajiv, Ganapathy, Subramanian, Bhaumik, Asim, Ahedi, Ranjeet Kaur
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
Usage, Zeolites, Crystallization, Catalyst supports

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Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism

Article Abstract:

Mesoporous molecular sieves with highly uniform pore size and spacing can be produced using a liquid-crystal template mechanism. Aluminosilicate gels are calcinated in the presence of surfactants, yielding a mesoporous solid with channel dimensions that can be tailored between 16 and 100 angstroms, by manipulation of reaction parameters. X-ray diffraction and electron microscopy reveal an interplanar spacing of about 40 angstroms.

Author: Kresge, C.T., Leonomicz, M.E., Roth, W.J., Vartuli, J.C., Beck, J.S.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
Innovations, Sorbents

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Trigger factor and DnaK cooperate in folding of newly synthesized proteins

Article Abstract:

Molecular chaperones help in the folding of newly synthesized proteins in the cytosol. It is shown that Deltatig::kan mutants lacking trigger factor have not defects in growth or protein folding, but combined Deltatig::kan and DeltadnaK mutations lead to synthetic lethality. DnaK depletion in the Deltatig::kan mutant leads to major aggregation of cytosolic proteins.

Author: Bukau, Bernd, Mogk, Axel, Deuerling, Elike, Schulze-Specking, Agnes, Tomoyasu, Toshifumi
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
Growth factors, Proteins, Cytosol

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Subjects list: Research, Molecular sieves
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