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  • 1
    Electronic Resource
    Electronic Resource
    Amsonia spp. as potential fuel crops for arid lands (1994)
    Springer
    World journal of microbiology and biotechnology 10 (1994), S. 290-292 
    Details
    ISSN: 1573-0972
    Keywords: Amsonia spp. ; saccharification ; simultaneous saccharification and fermentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The biomass of three desert plants, Amsonia kearneyana, A. grandiflora and A. palmeri, was used for the production of glucose and ethanol by simultaneous saccharification and fermentation techniques. Ethanol yields were 0.46 g g-1 for A. keurneyana, 0.51 g g-1 for A. grandiflora and 0.51 g g-1 for A. palmeri. When the plant materials were saccharified into glucose only, the yields obtained were 0.35 g g-1 for A. kearneyana, 0.39 g g-1 for A. grandiflora and 0.22 g g-1 for A. palmeri.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414865
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  • 2
    Electronic Resource
    Electronic Resource
    Book reviews (1991)
    Springer
    Journal of economics 53 (1991), S. 215-241 
    Details
    ISSN: 1617-7134
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01227468
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  • 3
    Electronic Resource
    Electronic Resource
    Biocontrol of a perennial legume, Sesbania punicea, using a florivorous weevil, Trichapion lativentre: weed population dynamics with a scarcity of seeds (1991)
    Springer
    Oecologia 88 (1991), S. 574-576 
    Details
    ISSN: 1432-1939
    Keywords: Biocontrol ; Seed-set ; Population dynamics ; Sesbania punicea ; Trichapion lativentre
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The establishment in South Africa of a florivorous, apionid weevil, Trichapion lativentre, on Sesbania punicea, a leguminous weed of South American origin, has reduced seed production of the plants by 〉98%. Surveys of the age structure and density of plants in infestations of S. punicea throughout South Africa have shown that the rate of recruitment of seedlings has drastically declined within a few years in many areas, due to the weevils. However, there has unexpectedly not been a corresponding decline in the density of mature plants in extant infestations of S. punicea. In spite of this, T. lativentre has curtailed the rate of spread of the weed into uninvaded habitats and has impeded reinvasion into areas cleared of infestations by mechanical means or by another complimentary biocontrol agent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317722
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature-programmed desorption (TPD) of ammonia from HZSM-5 zeolites (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 1379-1391 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die temperaturprogrammierte Desorption (TPD) einer Menge Ammoniak, die bei 373 K an einem HZSM-5 Zeolithen voradsorbiert wurde, ergibt eine aus zwei einander überlappenden Peaks (γ und \ Peak) bestehende komplexe Desorptionskurve. Das desorbierte Ammoniak kann unter Berücksichtigung von1H-MAS NMR Messungen auf SiOHAl-Gruppen zurückgeführt werden. Der Verlauf der Desorption kann für beide Peaks mittels einer Geschwindigkeitsgleichung beschrieben werden, die eine AbhÄngigkeit der Desorptionsenergie vom Bedeckungsgrad oder eine Energieverteilung berücksichtigt, wie durch verschiedene Wertbestimmungsmethoden gezeigt werden konnte. Die berechnete AbhÄngigkeit der Desorptionsenergie von der adsorbierten Ammoniakmenge stimmt gut mit Literaturangaben über mikrokalorimetrisch bestimmte AdsorptionswÄrmen überein.
    Notes: Abstract The temperature-programmed desorption (tpd) of the amount of ammonia which is preadsorbed at about 373 K at HZSM-5 zeolites yields a complex desorption curve consisting of two overlapped peaks (Β andγ peak). Parts of the ammonia desorbed can be attributed to SiOHAl groups considering also1H-MAS NMR measurements. The course of the desorption of both peaks is describable by a rate equation which considers a dependence of the desorption energy on the degree of coverage or an energy distribution, as could be shown by various methods of evaluation. The calculated dependence of the desorption energy on the ammonia amount adsorbed well agrees with data of literature of adsorption heats determined micro-calorimetrically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914061
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on the temperature programmed desorption of water from CoNaX zeolites (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 1487-1494 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Im Temperaturbereich von 470–970 K wurde bei einer Reihe CoNaX Zeolithen mit einem Si/Al-VerhÄltnis von 1.18 und einem unterschiedlichen Austauschgrad sowie bei dem NaX Stammtyp die Abspaltung von Wasser untersucht. Im Falle von CoNaX Zeolithen können Peaks bei 570 und 670 K und ein breiter flacher Peak bei noch höheren Temperaturen beobachtet werden. Die beiden ersten Peaks werden dem Proze\ der Dehydroxylierung zwischen CoOH- und strukturellen OH-Gruppen, letzterer der Dehydroxylierung nur zwischen strukturellen OH-Gruppen zugeschrieben. Der Stammtyp ergibt nur einen einzigen Peak mit einem Maximum bei 570 K. Aus den Dehydroxylierungspeaks wurden Aktivierungsparameter berechnet und ein Mechanismusschema entwickelt.
    Notes: Abstract The splitting of water in the temperature range from 470 to 970 K was studied for a series of CoNaX zeolites of a Si/Al ratio of 1.18 and of different degree of exchange and at the parent type NaX. In case of CoNaX zeolites peaks at about 570 and 670 K and a broad flat peak at even higher temperatures could be observed. Both the first peaks are ascribed to the process of dehydroxylation between CoOH and structural OH groups, the latter to the dehydroxylation between structural OH groups only. The parent type provided only a single peak with a maximum at about 570 K. From the dehydroxylation peaks activation parameters have been calculated and a scheme has been suggested for the mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914072
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  • 6
    Electronic Resource
    Electronic Resource
    Kinetic analysis of temperature-programmed surface reactions on porous catalysts (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 739-748 
    Details
    ISSN: 1572-8943
    Keywords: kinetic analysis ; NaX-zeolite catalyst ; surface reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Modellrechnungen für eine irreversible Oberflächenreaktion 1. Ordnung konnte gezeigt werden, daß durch Anwendung der Methode der Variation der Heizgeschwindigkeit auf die Desorptionskurve des Ausgangsstoffes die näherungsweise Bestimmung der Aktivierungsenergie der Desorption des Ausgangsstoffes bzw. der Oberflächenreaktion möglich ist, je nachdem ob das Verhältnis der Aktivierungsenergien für die Oberflächenreaktion und der Desorption des Ausgangsstoffes größer oder kleiner als eins ist. Die Möglichkeiten der kinetischen Auswertung werden auf die isomerisierung von Cyclopropan an einem NaX-Zeoliten angewendet. Die erhaltene Adsorptionswärme für Cyclopropan und die Aktivierungsenergie für die Reaktion stimmen gut mit Literatur-werten von isothermen Messungen im Impulsreaktor überein.
    Notes: Abstract By means of model calculations it could be shown for an irreversible surface reaction of 1st order that the determination of the activation energy of the desorption of the reactant or, respectively, of the surface reaction is possible by application of the method of variation of the heating rate to the desorption curve of the reactant, according to circumstances whether the ratio of the activation energy of the surface reaction and of the desorption of the reactant is greater or smaller than one. The possibilities of the kinetic evaluation are applied to the isomerization of cyclopropane on a NaX-zeolite catalyst. The resulting heat of adsorption of cyclopropane and the activation energy of the reaction agree well with the values of literature obtained by isothermal measurements in a pulse reactor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979404
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  • 7
    Electronic Resource
    Electronic Resource
    Temperature-programmed desorption (TPD) of hydrogen from a NiNaY zeolite after reduction (1990)
    Springer
    Reaction kinetics and catalysis letters 41 (1990), S. 233-237 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract С помощью ТПД показано, что десорбция водорода с восстановленного NiY-цеолита стехиометрически соответствует уменьшению степени восстановления. Поэтому причиной отщепления водорода служит парциальное реокисление Ni0.
    Notes: Abstract By TPD it could be shown that hydrogen desorption of a reduced NiY-zeolite stoichiometrically corresponds to the decrease of reduction degree. Therefore, the reason for hydrogen abstraction should be a partial reoxidation of Ni0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02097874
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  • 8
    Electronic Resource
    Electronic Resource
    Neue Silicate mit „Stuffed Pyrgoms“: CsKNaLi9{Li[SiO4]}4, CsKNa2Li8{Li[SiO4]}4, RbNa3Li8{Li[SiO4]}4 [1] und RbNaLi4{Li[SiO4]}2 [2]Professor Horst Sabrowsky zum 60. Geburtstage gewidmet (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1495-1508 
    Details
    ISSN: 0044-2313
    Keywords: New Lithosilicates ; preparation ; crystal structure ; MAPLE and CHARDI calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: More Silicates with „Stuffed Pyrgoms“: CsKNaLi9{Li[SiO4]}4, CsKNa2Li8{Li[SiO4]}4, RbNa3Li8{Li[SiO4]}4 [1] and RbNaLi4{Li[SiO4]}2 [2]Single crystals of the new silicates CsKNaLi9{Li[SiO4]}4, CsKNa2Li8{Li[SiO4]}4, RbNa3Li8{Li[SiO4]}4 and RbNaLi4{Li[SiO4]}2 as well as powder (Rb-containing compounds only) were obtained for the first time. The samples were prepared by heating well ground mixtures of the binary oxides in Ni and Ag tubes, respectively. The structure determination was carried out by four-circle diffractometer data (MoKα radiation; Siemens AED 2):CsKNaLi9{Li[SiO4]}4: tetragonally prismatic crystals, light yellow; 726 I0(hkl), R = 4.4%, Rw = 2.8%; a = 1 102.0(6), c = 637.9(5) pm; Z = 2; space group I4/m; 2 CsO0.55 + Li4TlO4 + glas (560°C, 15 d).CsKNa2Li8{Li[SiO4]}4: tetragonally prismatic crystals, light yellow; 727 I0(hkl), R = 4.4%, Rw = 2.6%; a = 1 103.5(7), c = 637.7(4) pm; Z = 2; space group I4/m; 1.1 CsO0.61 + 1.1 KO0.55 + 1.4 NaO0.52 + 6.5 Li2O + 4 SiO2 (600°C, 60 d).RbNa3Li8{Li[SiO4]}4: tetragonally prismatic crystals, colourless; 600 I0(hkl), R = 2.3%, Rw = 2.0%; a = 1 092.08(6), c = 632.76(4) pm; Z = 2; space group I4/m; 4 RbO0.57 + 3 NaO0.52 + 6.5 Li2O + 4 SiO2 (650°C, 63 d).RbNaLi4{Li[SiO4]}2: monoclinic, ball-shaped, colourless; 1 224 I0(hkl), R = 3.1%, Rw = 3.1%; a = 1 573.10(13), b = 630.48(5), c = 781.25(8) pm, b = 90.566(8)°; Z = 4; space group C2/m; 1.1 RbO0.52 + 1.2 NaO0.45 + 5 Li2O + 4 SiO2 (700°C, 40 d).
    Notes: Einkristalle der neuen Silicate CsKNaLi9{Li[SiO4]}4, CsKNa2Li8{Li[SiO4]}4, RbNa3Li8{Li[SiO4]}4 und RbNaLi4{Li[SiO4]}2, sowie Pulver der Rb-haltigen Verbindungen wurden dargstellt. Die Proben entstanden durch Tempern inniger Gemenge binärer Oxide in geschlossenen Ni- bzw. Ag-Bömbchen. Die Strukturaufklärung erfolgte jeweils durch Vierkreisdiffraktometerdaten (MoKα-Strahlung; Siemens AED 2):CsKNaLi9{Li[SiO4]}4: tetragonale Prismen, hellgelb; 726 I0(hkl), R = 4,4%, Rw = 2,8%; a = 1 102,0(6), c = 637,9(5) pm; Z = 2; Raumgruppe I4/m; 2 CsO0,55 + LiTlO4 + Duran-Glas (560°C, 15 d).CsKNa2Li8{Li[SiO4]}4: tetragonale Prismen, hellgelb; 727 I0(hkl), R = 4,4%, Rw = 2,6%; a = 1 103,5(7), c = 637,7(4) pm; Z = 2; Raumgruppe I4/m; 1,1 CsO0,61 + 1,1 KO0,55 + 1,4 NaO0,52 + 6,5 Li2O + 4 SiO2 (600°C, 60 d).RbNa3Li8{Li[SiO4]}4: tetragonale Prismen, farblos; 600 I0(hkl), R = 2,3%, Rw = 2,0%; a = 1 092,08(6), c = 632,76(4) pm; Z = 2; Raumgruppe I4/m; 4 RbO0,57 + 3 NaO0,52 + 6,5 Li2O + 4 SiO2 (650°C, 63 d).RbNaLi4{Li[SiO4]}2: monoklin, kugelförmig, farblos; 1 224 I0(hkl), R = 3,1%, Rw = 3,1%; a = 1 573,10(13), b = 630,48(5), c = 781,25(8) pm, b = 90,566(8)°; Z = 4; Raumgruppe C2/m; 1,1 RbO0,52 + 1,2 NaO0,45 + 5 Li2O + 4 SiO2 (700°C, 40 d)
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200902
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  • 9
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    Single nucleotide primer extension to detect genetic diseases: experimental application to hemophilia B (factor IX) and cystic fibrosis genes. (1991)
    National Academy of Sciences
    Details
    Publication Date: 1991-02-15
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Correction of murine mucopolysaccharidosis VII by a human beta-glucuronidase transgene. (1990)
    National Academy of Sciences
    Details
    Publication Date: 1990-05-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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