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Digitale Medien

Facilitated transport of CO2 in ion exchange membranes (1987)

Way, J. D. ; Noble, R. D. ; Reed, D. L. ; [weitere]

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 33 (1987), S. 480-487

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ISSN: 0001-1541

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: The facilitated transport of CO2 through ion exchange membranes containing organic amine counterions was studied. Steady state CO2 fluxes were measured from pure gas streams and mixtures with CH4. Facilitation factors for CO2 up to 26.7 were calculated from transport data. Transport measurements were binary mixtures of CO2 and CH4 yielded ratios of CO2 flux to CH4 flux ranging from 29.0 to 264. Conversion of flux ratios to permeabilities yielded separation factors up to 551 for CO2 over CH4, which are compared to literature data for polymeric membranes. The transport data support a mobile, reactive-carrier facilitated transport mechanism with a carbamate zwitterion complex. Effective diffusivities for CO2 and the carrier-gas complex were determined from transport data. A reaction equilibrium model predicted facilitation factors that were in very good agreement with experimental values. Potential applications are also discussed.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/aic.690330313

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2

Digitale Medien

Pharmacological profile of the substituted beta-lactam L-659,286: A member of a new class of human PMN elastase inhibitors (1989)

Bonney, R. J. ; Ashe, B. ; Maycock, A. ; [weitere]

New York, N.Y. : Wiley-Blackwell

Journal of Cellular Biochemistry 39 (1989), S. 47-53

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ISSN: 0730-2312

Schlagwort(e): elastase inhibitors ; β-lactams ; lung damage ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Chemie und Pharmazie , Medizin

Notizen: Human polymorphonuclear leukocyte elastase (PMN elastase) is inhibited by L-659, 286 (7α-methoxy-8-oxo-3-[[(1,2,5,6-tetrahydro-2-methyl-5,6-dioxo-1,2,4-triaz-in-3-yl)thio]methyl]-5-thia-1-aza-6R-bicyclo [4.2.O]oct-2-ene-2-pyrrolidine carboxamide-5,-dioxide) with a Ki of 0.4 μM. This inhibition is time-dependent, rapid, and only slowly reversible, with a t1/2 of 〉 3 days at 25°C. L-659, 286 is also highly selective for PMN elastase, as it does not inhibit thrombin, trypsin, papain, plasmin, chymotrypsin, or cathepsin G. L-659, 286 administered intratracheally inhibits lung damage caused by administration via the same route of human PMN elastase into hamsters. In marmosets, L-659, 286 is cleared from blood very rapidly after an intravenous injection but is recovered in bronchoalveolar lavage fluid for several hours after intratracheal administration.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jcb.240390106

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3

Digitale Medien

Plant tubulin genes: Structure and differential expression during development (1987)

Silflow, Carolyn D. ; Oppenheimer, David G. ; Kopozak, Steven D. ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

Developmental Genetics 8 (1987), S. 435-460

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ISSN: 0192-253X

Schlagwort(e): tubulin genes ; microtubules ; Arabidopsis thaliana ; Life and Medical Sciences ; Genetics

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie

Notizen: Microtubules are important components of the cytoskeleton of plant cells and play key roles in plant growth and morphogenesis. Recent molecular studies have begun to elucidate the structure and expression of plant genes coding for the major components of microtubules, α- and β-tubulin. Tubulin amino acid sequences deduced from the DNA sequences of eight higher plant tubulin genes are 79-87% homologous with constitutively expressed mammalian tubulins. The genome of the model plant system Arabidopsis thaliana contains four dispersed α-tubulin sequences and at least seven β-tubulin sequences, only two of which appear to be linked. Of the five A. thaliana genes whose expression has been analyzed, the transcripts of one α-tubulin and one β-tubulin gene are constitutively expressed in roots, leaves, and flowers. A second α-tubulin gene is expressed predominately in flowers; the transcripts of the second and third β-tubulin genes are found predominately in leaves or in roots, respectively.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/dvg.1020080511

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Digitale Medien

Morphologie und Nanostruktur von kolloidalem Gold und SilberDiese Arbeit wurde vom SERC sowie von Johnson Matthey und ICI gefördert. P. P. E. dankt der Nuffield Foundation für ein einjähriges Forschungsstipendium. (1987)

Duff, D. G. ; Curtis, A. C. ; Edwards, Peter P. ; [weitere]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 99 (1987), S. 688-691

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ISSN: 0044-8249

Schlagwort(e): Chemistry ; General Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/ange.19870990716

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5

Digitale Medien

Low Temperature Deposition of a CaF2 Insulator Layer on GaAs (1989)

Vere, A. W. ; Mackey, K. J. ; Rodway, D. C. ; [weitere]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 101 (1989), S. 1613-1614

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ISSN: 0044-8249

Schlagwort(e): Chemistry ; General Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/ange.19891011147

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Digitale Medien

Low Temperature Deposition of a CaF2 Insulator Layer on GaAs* (1989)

Vere, A. W. ; Mackey, K. J. ; Rodway, D. C. ; [weitere]

Weinheim : Wiley-Blackwell

Angewandte Chemie International Edition in English 28 (1989), S. 1581-1582

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ISSN: 0570-0833

Schlagwort(e): Chemistry ; General Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/anie.198915811

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7

Digitale Medien

The Morphology and Microstructure of Colloidal Silver and GoldWe thank the SERC, Johnson Matthey, and ICI for support, P. P. E. also thanks the Nuffield Foundation for the award of a One Year Research Fellowship. (1987)

Duff, D. G. ; Curtis, A. C. ; Edwards, Peter P. ; [weitere]

Weinheim : Wiley-Blackwell

Angewandte Chemie International Edition in English 26 (1987), S. 676-678

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ISSN: 0570-0833

Schlagwort(e): Chemistry ; General Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/anie.198706761

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8

Digitale Medien

Lymph heart musculature in birds (1987)

Budras, K.- D. ; Hullinger, R. L. ; Rautenfeld, D. Berens V.

New York, NY : Wiley-Blackwell

Journal of Morphology 191 (1987), S. 77-87

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ISSN: 0362-2525

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Notizen: Development and innervation of the lymph heart musculature of chicken, emu, rhea, and duck was studied by electron microscopy at posthatch ages from 3 days to adulthood. Development of innervation was monitored by acetylcholinesterase staining. Horseradish peroxidase was used to determine the extent of the transverse tubule network. Chickens were unusual among these birds in that lymph heart myocytes had already undergone a definitive differentiation and degeneration by 3 days. In ducks and ratite birds, lymph heart myocytes more slowly but progressively differentiate a cytomorphology that does not conform in all characteristics to cardiac or skeletal muscle and even resembles in some aspects, smooth muscle. Myofibrils become the dominant cytoplasmic structure, transverse tubules form ‘internal couplings’ with agranular reticulum cisternae, and ‘external couplings’ are formed between myocytes at myomyal junctions. The myomyal junctions also contain AChE-positive reaction product and some subplasmalemmal vesicles that lack a dense core. The lymph heart myocardium of ducks of 2 weeks demonstrated mitotic figures. In adult ducks the myosatellite cell numbers diminish and a characteristic pattern of myocyte degeneration appears. In juvenile ducks and ratites some myocytes differentiate to conductile cells, much as the conductile myocytes and myofibers of the blood heart. The lymph heart innervation is described, and the role of nerve in differentiation and maintenance of myocyte morphology in the lymph heart is discussed.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jmor.1051910108

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9

Digitale Medien

Application of LQ and IMC controllers to a packed-bed reactor (1987)

Kozub, D. J. ; Macgregor, J. F. ; Wright, J. D.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 33 (1987), S. 1496-1506

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ISSN: 0001-1541

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: A practical application of advanced, model-based, multivariable control to a pilot plant packed-bed reactor carrying out highly exothermic butane hydrogenolysis reactions is presented. The system is first stabilized by using butane flow rate to control the reactor hot-spot temperature. Propane production and butane conversion are then controlled using multivariable controllers that manipulate the hot-spot temperature set point and hydrogen flow rate. The controller designs are based on multivariable transfer function models developed using multivariable time series and process identification methods.Two types of multivariable controllers are applied. The first is an internal model controller (IMC) utilizing a stabilized approximation of the model inverse and a tunable exponential filter. The second is a linear-quadratic (LQ) controller design using pulse transfer function models to characterize the process dynamics and autoregressive-moving average models to characterize the disturbances. The optimal control solution was arrived at via a spectral factorization solution to the Wiener-Hopf equations. The results indicate that both designs, if well tuned, provide good performance and robustness over a wide range of operation.

Zusätzliches Material: 10 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/aic.690330909

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10

Digitale Medien

An image-carrying fiber optic probe to investigate solids distribution around an immersed surface in a gas-fluidized bed (1987)

Saxena, S. C. ; Patel, D. C. ; Kathuria, D.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 33 (1987), S. 672-676

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ISSN: 0001-1541

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/aic.690330416

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