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  • 1
    Electronic Resource
    Electronic Resource
    Intracellular pH and energy metabolism in the highly stenothermal Antarctic bivalve Limopsis marionensis as a function of ambient temperature (1999)
    Springer
    Polar biology 22 (1999), S. 17-30 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in oxygen consumption, ammonia excretion and in the acid-base and energy status of various tissues were investigated in the cold stenothermal Antarctic bivalve, Limopsis marionensis, and compared to similar data in the limpet, Nacella concinna, for an assessment of thermal sensitivity. Oxygen consumption of L. marionensis varied between −1.5 and 2°C with a Q 10 of 2.2. Ammonia excretion could only be detected in animals exposed to elevated temperature for periods in excess of 45 days and close to death and it is interpreted as the onset of protein and amino acid catabolism with starvation under temperature stress. In L. marionensis any change in temperature as well as starvation stress at constant temperature induced a decrease in phospho-l-arginine and ATP levels. However, only temperature stress resulted in a drop in the Gibb's free energy change of ATP hydrolysis. Intracellular pH rose in all tissues during upward or downward temperature changes of only 1.5 or 2°C for 24 h with a concomitant trend to accumulate succinate and acetate in the tissues. These changes are seen to reflect disturbances of the tissue acid-base and energy status with any under- or overshoot in aerobic metabolic rate during a temperature decrease or increase. Elevated temperature at 2°C during 2 weeks of incubation resulted in continued net ATP depletion, at low levels of ATP free energy. This indicates long-term stress, which was also mirrored in the inability to establish a new steady-state mean rate of oxygen consumption. Incubation at even higher temperatures of 4 and 7°C led to an aggravation of energetic stress and transition to an intracellular acidosis, as well as a fall in oxygen consumption. In N. concinna a drop in energy levels was also visible at 2°C but was compensated for during long-term incubation. In conclusion, L. marionensis will be able to compensate for a temperature change only in a very narrow range whereas the thermal tolerance window is much wider in N. concinna. The inability of the metabolic rate to rise continually and the concomitant transition to anaerobic metabolism and long-term energetic stress characterize the upper critical temperature. Stenothermality is discussed, not only as reflecting the permanent and very stable low temperature in the natural environment, but also regarding dif- ferences in the level of activity and aerobic scope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050386
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  • 2
    Electronic Resource
    Electronic Resource
    Das Spurenelement Kobalt als bevorzugter Aktivator von Hemmungskörpern in Redox-Systemen (1962)
    Springer
    Naturwissenschaften 49 (1962), S. 347-347 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185118
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  • 3
    Electronic Resource
    Electronic Resource
    Die katalytische Aktivität von 10−11 g Cu2+ (1963)
    Springer
    Naturwissenschaften 50 (1963), S. 18-18 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00836593
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  • 4
    Electronic Resource
    Electronic Resource
    Über den Nachweis von frühzeitigen, subtilen Veränderungen der Festkörperoberfläche am Beispiel des V2O5 (1964)
    Springer
    Monatshefte für Chemie 95 (1964), S. 598-599 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901325
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  • 5
    Electronic Resource
    Electronic Resource
    Some physico-chemical and catalytic properties of nickel(II) oxide promoted with gadolinium(III) oxide (1981)
    Springer
    Reaction kinetics and catalysis letters 18 (1981), S. 347-351 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Изучены химический и фазовый составы NiO−Gd2O3 катализаторов. Установлено, что в ведение добавки Gd2O3 тормозит спекание NiO и увеличивает ее откло-нение от стехиометрии. Каталитическая активность в реакции окисления окиси утлерода не изменяется монотонно с увеличением концентрации добавки Gd2O3 в катализаторах.
    Notes: Abstract Chemical and phase compositions of NiO−Gd2O3 catalysts have been studied. It has been found that the Gd2O3 dopant retards the sintering of NiO and increases its deviation from stoichiometry. Catalytic activity for CO oxidation does not change monotonically with an increase in Gd2O3 content in the catalysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065620
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  • 6
    Electronic Resource
    Electronic Resource
    Alkylation of toluene with methanol over rare earth forms of Na−X, FAU and Na−Y, FAU (1981)
    Springer
    Reaction kinetics and catalysis letters 16 (1981), S. 119-122 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Было найдено, что (Laex, Na)-X, FAU, (Na, Yex)-X, FAU, (Laex, Na)-Y, FaU и (Na, Yex)-Y, FAU являются активными и селективными катализаторами алкилирования толуола метанолом. Na−X, FAU и Na−Y, FAU, молифицрованные La3+, обладают наивысшей активностью, однако, стабильная активность была достигнута лишь на формах Y3+. В сериях (Na, REex)-X, FAU предпочтительным является орто-замещение, в то время как в сериях (Na, REex)-Y, FAU-пара-замещение. Замещение на центрах кислот Ърёнстэда обусловлено их силой.
    Notes: Abstract (Laex, Na)-X, FAU, (Na, Yex)-X, FAU, (Laex, Na)-Y, FAU and (Na, Yex)-Y, FAU have been shown to be active and selective catalysts for the alkylation of toluene with methanol. Na−X, FAU and Na−Y, FAU modified by La3+ have the highest activity but a very stable activity was reached only on Y3+ forms. (Na, REex)-X FAU series prefer ortho-substitution while (Na, REex)-Y, FAU para-substitution. Brönsted acid centers and their strength are responsible for substition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065442
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  • 7
    Electronic Resource
    Electronic Resource
    Catalytic desulfurization of ethanethiol over zinc-forms of NaX zeolites (1982)
    Springer
    Reaction kinetics and catalysis letters 21 (1982), S. 461-466 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Цеолит X, обмененный на Zn, эффективно катализирует дегидросульфуризацию этантиола. Каталитическая активность линейно зависит от степени ионного обмена и увеличевается с повышением температуры. Была обсуждена роль катионов цинка в изученной реакции и делаются предположения относительно механизма реакции.
    Notes: Abstract Zinc exchanged zeolite X was found to catalyze effectively the dehydrosulfurization of ethanethiol. The catalytic activity correlated linearly with the degree of ion exchange and increased with the reaction temperature. The role of zinc cations in the reaction examined is discussed and suggestions concerning the reaction mechanism are put forward.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02095842
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on the V−Ti−O system obtained by thermal decomposition of vanadyl and titanyl oxalates in argon atmosphere (1980)
    Springer
    Reaction kinetics and catalysis letters 14 (1980), S. 233-238 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Система V−Ti−O, Являющаяся продуктом термического разложения ванадльных и титанильных оксалатов при 873 К и 1173 К в атмосфере аргона исследована с помощяы рентьенодиффракционного и ИК-спектроскопического методов. На основе полученных результатов, а также данных поверхностных измерений полагается, что при составе V+3−V+4−O ов⌕азуется твердый раствор. Из спектроскопических измерений полагается наличие связн V=O в системе, полученной при 873 К.
    Notes: Abstract The V−Ti−O system as a product of thermal decomposition of vanadyl and titanyl oxalates at 873 and 1173 K in argon atmosphere was studied by X-ray diffraction and infrared spectroscopy. The results obtained, the analysis and surface measurement data suggest that a V3+−V4+−Ti4+−O solid solution is formed. Spectroscopic measurements reveal the presence of a V=O bond in the system obtained at 873 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061292
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  • 9
    Electronic Resource
    Electronic Resource
    Détermination des chaleurs de formation des orthovanadates de certains éléments des terres rares par la méthode d'analyse thermique différentielle (1980)
    Springer
    Journal of thermal analysis and calorimetry 19 (1980), S. 61-67 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a déterminé les chaleurs de formation des sels LnVO4 (Ln=Y, La, Sm, Nd, Gd et Dy) dans la réaction entre les oxydes de lanthanides stables etV2O5 fondu (rapportmolaire = =1 ∶ 1) par la méthode d'analyse thermique différentielle. Les chaleurs de formations des sels LnVO4 peuvent aussi être obtenues en utilisant des mélanges non-stoichiométriques de substrats. Par la même méthode d'analyse thermique différentielle on a aussi déterminé les énergies d'activation apparentes des réactions de synthèse des orthovanadates de lanthanides.
    Abstract: Zusammenfassung Die Bildungswärme von Salzen des Typs LnVO4 (Ln=Y, La, Sm, Nd, Gd und Dy) wurde durch thermische Analyse der Reaktion von stabilen Lanthaniden mit einer V2O5-Schmelze im Molverhältnis 1 ∶ 1 bestimmt. Die Bildungswärme der Salze vom Typ LnVO4 kann durch die Verwendung einer nichtstöchiometrischen Mischung auf der Unterlage gut bestimmt werden. Mit Hilfe der DTA wurde die auftretende Aktivierungsenergie der Synthese der Orthovanadate der Lanthanide berechnet.
    Notes: Abstract The heats of formation of LnVO4-type salts (whereLn=Y, La, Sm, Nd, Gd and Dy) were determined by thermal analysis in the reactions of melts of stable lanthanides and V2O5 in a 1 ∶ 1 mole ratio. Heats of formation of LnVO4-type salts can be determined using non-stoichiometric mixtures of the substrates as well. With the aid of DTA the apparent activation energies of the syntheses of the orthovanadates of these lanthanides were calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01928431
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  • 10
    Electronic Resource
    Electronic Resource
    Eine einfache Methode zur Bestimmung von Spurenmengen Kobalt (II)-ionen auf katalytischer Grundlage (1962)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 187 (1962), S. 350-353 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Es wird eine Methode beschrieben, nach der, gegebenenfalls unter Zuhilfenahme von Testlösungen, Spurenmengen von Co2+ in einem Konzentrationsbereich von 10 mg bis zu 0,001 mg herab in 1 ml sich recht genau auf Grund der Katalyse der H2O2-Indigocarminreaktion in Gegenwart von Calciumcarbonat als Träger bestimmen lassen. Da das Volumen der Versuchslösung stets 60 ml beträgt (siehe oben), beläuft sich die kleinste noch bestimmbare Co2+-Konzentration auf 10−6 g Co2+ in 60 ml was einer Verdünnung von 1∶6·107 entspricht. In bezug auf diese Empfindlichkeit steht die Methode den colorimetrischen bzw. spektrophotometrischen1,6 und auch den komplexchemischen7 Verfahren nicht nach. Sie bietet aber im Vergleich mit diesen insofern gewisse Vorteile, als man die störenden Fremdionen meist nicht zu entfernen braucht, was auf eine beträchtliche Zeitersparnis hinauskommt. Schließlich ist die katalytische Methode, für die mit entsprechenden Abänderungen auch eine Temperatur von 30° C genügen würde, in ihrer Handhabung und Ausführung sehr einfach und bedarf, abgesehen vom Thermostaten, keiner kostspieligen Apparatur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625132
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