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  • 1
    Electronic Resource
    Electronic Resource
    Conformation-function relationships in hydrophobic peptides: Interior turns and signal sequencesDedicated to Elkan R. Blout on the occasion of his sixty-fifth birthday. (1985)
    New York : Wiley-Blackwell
    Biopolymers 24 (1985), S. 117-135 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two studies are diescribed in which synthetic peptides have been designed and examined to address biochemical problems inherent in hydorphobic environments: (1) The cyclic hexapeptide cyclo-(D-Tyr(Bzl)-Gly-Ile-Leu-Gln-Pro) was synthesized as a model of an interior β-turn from the protein lysozyme. Conformational analysis by proton nmr methods, including two-dimensional nulcear Overhauser effect spectroscopy, revealed that the model peptide adopts one conformation in chloroform/dimethyl sulfoxide (98.2) and tetramethylene sulfone solutions. The conformation consists of two linked β-turns, one with the same sequence (Gly-Ile-Leu-Gln) and geometry (Type I) as the protein turn. (2) Major portions of the λ-receptor protein (LamB) signal sequences from E. coli wildtype and mutant strains have been synthesized. The conformational properties and membrane interactions of these synthetic signal peptides correlate with the in vivo export function of the wild type and mutant strains. Functional signal sequences are significantly richer in α-helix in aaqueous trifluoroethanol, lysolecithin, or sodium do-decyl sulfate solution than is a nonfunctional mutant signal sequence.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360240111
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  • 2
    Electronic Resource
    Electronic Resource
    Electrochemical control of redox potential in batch cultures of Escherichia coli (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 1512-1515 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260271018
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  • 3
    Electronic Resource
    Electronic Resource
    Control of ammonium concentration in Escherichia coli fermentations (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 818-824 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A control system has been devised for the maintenance of stable ammonium concentrations throughout a fedbatch fermentation. The control system is based on an ammonia gas-sensing electrode that monitors a pH-adjusted effluent stream from the fermentor. To overcome the time lag between the fermentor and the electrode, feedback control included metered flows of ammonium to both the fermentor and the electrode vessel. The system was used to study the growth of Escherichia coli B (ATCC 11303) at controlled ammonium concentrations of 5 to 200mM. Apparent specific growth rates, biomass and protein production, and glucose yields were essentially constant from 5 to 170mM. Above 170mM ammonium growth was inhibited. As ammonium concentration decreased from 170 to 5mM, ammonium yields increased from 1 to 24 g cell dry wt/g ammonium utilized. The results demonstrate that control of ammonium concentrations at levels so low that ammonium would be exhausted in batch fermentations can significantly increase overall ammonium yields.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260270610
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  • 4
    Electronic Resource
    Electronic Resource
    Electrochemical ph control of Saccharomyces cerevisiae Batch cultures (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 214-216 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260270218
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrodynamic simulation of periodic cycled plate columns (1985)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 1275-1287 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A mathematical model of the hydrodynamic processes occurring in a periodic cycled plate column is developed and experimentally confirmed. The model is applied to the prediction of the holdup distribution and the investigation of hydrodynamic problems. An effective manifold arrangement is proposed to minimize the uneven liquid draining encountered in previous experimental studies.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690310806
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of dust and surface swab samples for octachlorodibenzo-p-dioxin and heptachlorodibenzo-p-dioxins by fused silica capillary GC with EC detection (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 12-19 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Fused silica capillary columns ; Electron capture detection ; Octachlorobenzo-p-dioxin ; Heptachlorobenzo-p-dioxin ; Polychlorinated dibenzofurans ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method is described for the analysis of contaminated building dust samples and surface swab samples for octachlorodibenzo-p-dioxin (OCDD) and heptachlorodibenzo-p-dioxins (HpCDDs). The samples were analyzed by fused silica capillary GC combined with electron capture detection. Analysis was preceded by a short HPLC cleanup step designed to remove polychlorinated biphenyls (PCBs) and other compounds that might interfere. The method was found to work successfully on surface swab and dust samples known to contain PCBs, OCDD, and HpCDDs. The overall recovery of the analysis procedure for OCDD was found to be approximately 80%. The detection limit for the method was sample dependent, but for one typical set of surface swab samples was 0.2 μg/m2 of OCDD.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240080104
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  • 7
    Electronic Resource
    Electronic Resource
    Mass spectral characterization of doxylamine and its rhesus monkey urinary metabolites (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1985), S. 151-158 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This study describes the use of mass spectrometry (MS), high-performance liquid chromatography (HPLC) and chemical derivatization techniques for the identification of doxylamine and five rhesus monkey urinary metabolites. The analyses were performed using chemical ionization mass spectrometry with either methane or ammonia as the reagent gas. The confirmation of the structures of two of these urinary metabolites was aided by the synthesis of doxylamine N-oxide and desmethyldoxylamine and by the use of methylation and acetylation derivatization techniques. Doxylamine N-oxide, desmethyldoxylamine, didesmethyldoxylamine, and two metabolites which resulted from the cleavage of the aliphatic tertiary nitrogen side chain to the subsequent 2-[1-phenyl-1-(2-pyridinyl)ethoxy]acetic acid or 2-[1-phenyl-1-(2-pyridinyl)ethoxy]methanol compounds were isolated and identified from rhesus monkey urine. Additional data concerning the mass spectral analysis of derivatization or reaction products from the three chloroformate reactions with doxylamine, and the synthesis and separation techniques which afforded mass spectral identification of the urinary metabolites are also presented.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200120403
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal decomposition of methane: Autocatalysis (1985)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 17 (1985), S. 967-990 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The origin of autocatalysis in the pyrolysis of methane has been investigated by kinetic modeling. A mechanism is presented that provides good agreement with experimental data at 1038 K and 433 torr into the autocatalytic region. The main causes of autocatalysis are secondary initiation by hydrocarbon products larger than C2H6 and chain radical methylation sequences.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550170905
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetic study of the reaction of OH with HCl from 240-1055 K (1985)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 17 (1985), S. 1281-1297 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Absolute rate coefficients for the reaction of OH with HCl (k1) have been measured as a function of temperature over the range 240-1055 K. OH was produced by flash photolysis of H2O at λ 〉 165 nm, 266 nm laser photolysis of O3/H2O mixtures, or 266 nm laser photolysis of H2O2. OH was monitored by time-resolved resonance fluorescenceor pulsed laser-induced fluorescence. In many experiments the HCl concentration was measured in situ in the slow flow reactor by UV photometry. Over the temperature range 240-363 K the following Arrhenius expression is an adequate representation of the data: k1 = (2.4 ± 0.2) × 10-12 exp[-(327 ± 28)/T]cm3 molecule-1 s-1. Over the wider temperature range 240-1055 K, the temperature dependence of k1 deviates from the Arrhenius form, but is adequately described by the expression k1 = 4.5 × 10-17 T1.65 exp(112/T) cm3 molecule-1 s-1. The error in a calculated rate coefficient at any temperature is 20%.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550171206
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  • 10
    Electronic Resource
    Electronic Resource
    New ecdysteroid conjugate: Isolation and identification of 26-hydroxyecdysone 26-phosphate from eggs of the tobacco hornworm, Manduca sexta (L.) (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 2 (1985), S. 227-236 
    Details
    ISSN: 0739-4462
    Keywords: 26-hydroxyecdysone 26-phosphate ; enzymatic hydrolysis ; ecdysteroid phosphate isolation ; ecdysteroid conjugate ; Manduca sexta ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The major ecdysteroid conjugate present in eggs (48-64 h old) of the tobacco hornworm has been purified by XAD-2 chromatography, C18 SEP-PAK separations, and ion suppression reversed-phase high-performance liquid chromatography. Enzymatic hydrolysis of the conjugate with acid phosphatase from human seminal fluid gave 26-hydroxyecdysone. The conjugate was identified as 26-hydroxyecdysone 26-phosphate by nuclear magnetic resonance and fast atom bombardment mass spectrometry. This compound is also the major conjugate of newly laid eggs (0-1 h old) of the tobacco hornworm. The role for ecdysteroid conjugates is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940020302
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