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  • National Academy of Sciences  (171)
  • Wiley-Blackwell  (122)
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  • 11
    Electronic Resource
    Electronic Resource
    Metabolic engineering of Serratia marcescens with the bacterial hemoglobin gene: Alterations in fermentation pathways (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 59 (1998), S. 640-646 
    Details
    ISSN: 0006-3592
    Keywords: Vitreoscilla hemoglobin ; metabolic engineering ; fermentation ; acetoin ; 2,3-butanediol ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Serratia marcescens was transformed with plasmid vector pUC8 or pUC8 containing the bacterial (Vitreoscilla) hemoglobin gene (vgb) on either a 2.3-kb fragment (pUC8:15) or 1.4-kb fragment (pUC8:16) of Vitreoscilla DNA. The vgb-bearing strains were compared with the pUC8 transformant and untransformed S. marcescens with respect to growth in Luria-Bertani (LB) broth supplemented with glucose or casein acid hydrolysate. Growth (on a viable cell basis) was similar to that in unsupplemented LB. Total acid excretion (as estimated by medium pH) was similar for all strains in both LB plus 2% casein acid hydrolysate and LB without additions. Acid excretion in LB plus 2% glucose was somewhat greater at up to 10 h in culture for the two vgb-bearing strains; from 10 to 26 h in culture, the pHs of these cultures continued to decrease (to 4.1-4.2), whereas those of the non-vgb-bearing strains returned to near the starting pH (7.4-7.8). Concomitantly, after 26 h of culture in LB plus 2% glucose, the non-vgb-bearing strains had produced about 15 times as much acetoin and about three to four times as much 2,3-butanediol as the vgb-bearing strains. In general, for all strains, much more acetoin and 2,3-butanediol were produced in LB plus 2% glucose than in unsupplemented LB. The exception was acetoin production by the strain bearing vgb on plasmid pUC8:15; after 26 h of culture in LB without supplementation it was between three and four times that of the other strains, and about 50% higher than its level in LB plus 2% glucose. When grown with the 2% casein acid hydrolysate supplement, the strain bearing vgb on plasmid pUC8:15 produced much more acetoin and 2,3-butanediol than the other strains after 26 hours in culture. The results confirm that vgb can significantly alter carbon metabolism and suggest that the use of vgb technology for directed metabolic engineering may be a complicated process, depending in part on medium composition. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 59:640-646, 1998.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Plasmid stability and α-amylase production in batch and continuous cultures of Bacillus subtilis TN106[pAT5] (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 33 (1989), S. 1010-1020 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cell growth and enzyme (α-amylase) production characteristics of Bacillus subtilis TN106 containing the recombinant plasmid pAT5 are investigated in batch and continuous cultures using a defined medium with glucose as the limiting nutrient. The batch culture studies demonstrate that the recombinant plasmid, reported earlier1 to be stably maintained in the host, suffers from segregational and structural instabilities. The structural instability of this strain occurred during culture storage and can be eliminated in bioreactor experiments by using a modified inoculum preparation procedure. Such elimination allows an unbiased investigation of segregational instability via continuous culture studies. Such studies conducted with this fast growing microorganism, in the absence of antibiotic selection pressure, indicate a very efficient glucose utilization (very low residual glucose concentrations) over a wide range of dilution rates (0.16 h-1 - 0.94 h-1). The nearly time-invariant and low residual glucose concentrations at each such dilution rate enable convenient estimation of growth parameters of the host and recombinant cells and frequency of segregational instability from transients in the resulting mixed cultures. The specific α-amylase activity exhibits an inverse relationship to the specific growth rate of recombinant cells. The growth of recombinant cells is not affected by the presence of antibiotic (kanamycin). The growth advantage of host cells over recombinant cells diminishes with increasing dilution rate.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260330810
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  • 13
    Electronic Resource
    Electronic Resource
    Nachwort. Folgerungen über die Form von Kohlenstoffketten (1921)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 119 (1921), S. 292-298 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19211190120
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  • 14
    Electronic Resource
    Electronic Resource
    Organo-metal carbonyl compounds of iron, molybdenum, and manganese as photosensitisers of the anhydride cure of epoxy resins (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 50 (1976), S. 9-14 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Verbindungen der Strukturformeln [π-C5H5M(CO)nX] (M = Fe, n = 2; M = Mo, n = 3; X = CH3, CH2C6H5, CH2Si(CH3)3, CH2OCH3, Sn(C6H5)3, SnCl3, HgCl, I), [Mn(CO)5CH3], und [(π-CH3C5H4)Mn(CO)3] wurden als Katalysatoren für die Härtung von Epoxidharzen unter verschiedenen Bedingungen geprüft. Es wurde gefunden, daß die Verbindungen [π-C5H5Fe(CO)2R] (R = CH3, CH2C6H5) und [π-C5H5Mo(CO)3CH3] wirksame lichtempfindliche Beschleuniger für die Anhydridhärtung von Expoxidharzen sind. Der Aktivierungsmechanismus wird diskutiert.
    Notes: Compounds of the types [π-C5H5M(CO)nX] (M = Fe, n = 2; M = Mo, n = 3; X = CH3, CH2C6H5, CH2Si(CH3)3, CH2OCH3, Sn(C6H5)3, SnCl3, HgCl, I), [Mn(CO)5CH3], and [(π-CH3C5H4)Mn(CO)3] have been examined as catalysts for the cure of epoxy resins under various conditions. It was found that the compounds [π-C5H5Fe(CO)2R] (R = CH3, CH2C6H5) and [π-C5H5Mo(CO)3CH3] are active photosensitizing agents for the anhydride cure of certain epoxy resins. The mechanism of the process is discussed.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050500102
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  • 15
    Electronic Resource
    Electronic Resource
    Paramagnetic shifts induced by europium and praseodymium chelates in the NMR spectrum of bisphenol a diglycidyl ether (1972)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 27 (1972), S. 159-164 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde eine Voruntersuchung des Einflusses unternommen, den die Verschiebereagenzien Tris-(dipivaloylmethano)-europium uncl Tris-(dipivaloylmethano)-pra-seodym auf das NMR-Spektrum des Diglyzidyläthers des Bisphenol A ausüben. Es ergab sich, daß die Signale der am Epoxidring anliegenden Protonen durch den Zusatz dieser Chelate weit mehr als die Signale der exozyklischen -OCH2-Gruppen verschoben werden. Die Verschiebung kann man durch den Zusatz eines Alkohols rückgängig machen, der vorzugsweise mit dem Verschiebemittel reagiert.
    Notes: A preliminary study has been made of the effects of the shift reagents Eu (DPM)3 and Pr(DPM)3 on the NMR spectrum of Bisphenol A diglycidyl ether (I). Protons attached to the epoxy ring were observed to shift appreciably more than protons of the exocyclic —OCH2— group, on addition of these chelates. The shifts could be reversed by addition of an alcohol, which interacted preferentially with the shift reagent.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1972.050270111
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  • 16
    Electronic Resource
    Electronic Resource
    Investigation by carbon-13 and proton NMR spectroscopy of the diglycidyl derivative of phenolphthalein (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 56 (1976), S. 157-162 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 13C-und 1H-NMR-Untersuchungen haben überzeugend gezeigt, daß die Hauptkomponente des Epoxidharzes aus Phenolphthalein und Epichlorhydrin ein aromatischer Diglycidyläther mit einem Lactonring ist und nicht eine chinoide Verbindung mit Glycidylätherund Glycidylesterstruktur.
    Notes: 13C- and 1H-NMR studies have shown conclusively that the main component of the epoxy resin derived from phenolphthalein and epichlorohydrin is an aromatic diglycidyl ether containing a lactone ring, rather than a glycidyl ether-glycidyl ester compound containing a quinoid ring.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050560112
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  • 17
    Electronic Resource
    Electronic Resource
    Analysis of resorcinol-phenol-formaldehyde resins by NMR spectroscopy (1972)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 26 (1972), S. 171-176 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird eine NMR-Methode zur Bestimmung der ungefähren Verhältnisse zwischen aus Phenolkernen, Resorcinkernen und Formaldehyd gebildeten Gruppenin Kondensationsprodukten aus Phenol, Resorcin und Formaldehyd beschrieben.
    Notes: A method is reported, based on NMR spectroscopy, for approximate determination of the component ratios of resins formed by condensation of resorcinol, phenol and formaldehyde.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1972.050260113
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  • 18
    Electronic Resource
    Electronic Resource
    Paramagnetic shifts induced by europium and praseodymium complexes in the NMR spectra of some substituted phenols (1972)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 27 (1972), S. 151-157 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurden die Verschiebungen untersucht, die durch Tris-(dipivaloylmethano)-europium und Tris-(dipivaloylmethano)-praseodym im NMR- Spektrum versehiedener Derivate substituierter Phenole hervorgerufen werden. Der Zweck dieser Arbeiten war, die Möglichkeiten zu erfassen, die diese Verschiebereagenzien als Hilfsmittel in der NMR-Analyse von Phenolharzen bieten, und Information über Verschiebungen bei Molekülen zu gewinnen, die mehr als eine Koordinationsposition besitzen.
    Notes: An investigation into the shifts induced in the NMR spectra of some derivatives of substituted phenols by tris(dipivalomethanato)europium and tris(dipivalomethanato)praseodymium is reported. The phenol derivatives were studied to ascertain the possible utility of the shift reagents as an aid in the analysis of phenolformaldehyde resins by NMR spectroscopy, and to gain information on induced shifts with molecules having more than one possible co-ordination site.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1972.050270110
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  • 19
    Electronic Resource
    Electronic Resource
    Fragmentierung stickstoffhaltiger Peroxide (1968)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 101 (1968), S. 1035-1042 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Peroxide mit γ-ständigem Stickstoff (1, 8, 2, 11) erleiden in Lösung schnelle Zersetzung. Dabei entwickeln die von Benzhydrazid abgeleiteten Peroxide 2 und 11 Stickstoff, während die den Peroxiden 1 und 8 zugrunde liegenden Alkylhydrazine quantitativ entalkyliert werden. Besonders bemerkenswert ist die Bildung von Benzoesäure-methylester aus 2 in Abwesenheit von Methanol. Die Abhängigkeit der Zerfallsgeschwindigkeiten von den Lösungsmitteln sowie von zugesetzten Säuren und Basen deuten auf einen polaren Zerfall nach Art einer Grobschen Fragmentierung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19681010338
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  • 20
    Electronic Resource
    Electronic Resource
    cis-Effekt bei photochemischen Cyclobutanspaltungen (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3084-3110 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The cis-Effect in Photochemical Cleavages of CyclobutanesSelectivities in cleavage orientations on direct irradiation of cyclobutane derivatives are studied systematically at 20-30°C and -190°C with various examples. Phenyl and acrylic ester groups, in more or less sterically hindered environments, serve as chromophors. The cleavage reactions proceed via short-lived 1,4-diradicals. As a consequence of the two-step mechanism geometric isomerization of the cyclobutanes is observed and  -  as expected  -  there is no precisely reciprocal behaviour of fluorescence yields and photochemical quantum yields within series of related compounds. There is a clear preference for cleavage of the cyclobutane bond bearing i the chromophore and ii the substituent which sterically interacts most effectively with the chromophore (cis-effect). The application of the empirically supported effect to cyclovinylogous (retro-)Diels-Alder and [4 + 2 + 2]-reactions, e. g., is discussed. The syntheses and chemical or spectroscopic characterization (UV, fluorescence, NMR) of the compounds (phenylcyclobutanes, truxinic esters, dimers of muconic esters) investigated are described.
    Notes: Die Spaltungsorientierung von Cyclobutanderivaten nach direkter Lichtanregung wird an zahlreichen Beispielen bei 20-30°C und -190°C systematisch untersucht. Als Chromophore in sterisch mehr oder weniger stark behinderter Umgebung dienen Phenyl- und Acrylester-Gruppen. Die Spaltungsreaktionen verlaufen über kurzlebige 1,4-Diradikale. Als Folge des Zweistufenmechanismus werden geometrische Isomerisierungen der Cyclobutane beobachtet, und man erhält  -  wie erwartet  -  kein exakt reziprokes Verhalten von Fluoreszenzausbeuten und photochemischen Quantenausbeuten in Verbindungsreihen. Bevorzugt wird die Cyclobutan-Bindung gespalten, welche den Chromophor und die sterisch am stärksten auf diesen einwirkende Gruppe trägt (cis-Effekt). Die Anwendung des empirisch gesicherten Effekts, z. B. auf cyclovinyloge (Retro-)Diels-Alder- und [4 + 2 + 2]-Reaktionen wird diskutiert. Synthese und chemische sowie spektroskopische Charakterisierung (UV, Fluoreszenz, NMR) der untersuchten Verbindungen (Phenylcyclobutane, Truxinsäureester, Muconsäureester-Dimere) werden mitgeteilt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100914
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