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  • Chemistry  (83)
  • Life Sciences (General)  (14)
  • 1995-1999  (42)
  • 1955-1959  (45)
  • 1940-1944  (10)
  • 1
    Publication Date: 2011-08-24
    Description: We describe a device for performing MRI with laser-polarized noble gas at low magnetic fields (〈50 G). The system is robust, portable, inexpensive, and provides gas-phase imaging resolution comparable to that of high field clinical instruments. At 20.6 G, we have imaged laser-polarized (3)He (Larmor frequency of 67 kHz) in both sealed glass cells and excised rat lungs, using approximately 0.1 G/cm gradients to achieve approximately 1 mm(2) resolution. In addition, we measured (3)He T(2)(*) times greater than 100 ms in excised rat lungs, which is roughly 20 times longer than typical values observed at high ( approximately 2 T) fields. We include a discussion of the practical considerations for working at low magnetic fields and conclude with evidence of radiation damping in this system. Copyright 1999 Academic Press.
    Keywords: Life Sciences (General)
    Type: Journal of magnetic resonance (San Diego, Calif. : 1997) (ISSN 1090-7807); Volume 141; 2; 217-27
    Format: text
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  • 2
    Publication Date: 2019-07-13
    Description: NMR images of laser polarized 3He gas were obtained at 21 G using a simple, homebuilt instrument. At such low fields magnetic resonance imaging (MRI) of thermally polarized samples (e.g., water) is not practical. Low-field noble gas MRI has novel scientific, engineering, and medical applications. Examples include portable systems for diagnosis of lung disease, as well as imaging of voids in porous media and within metallic systems.
    Keywords: Life Sciences (General)
    Type: Physical review letters (ISSN 0031-9007); 81; 17; 3785-8
    Format: text
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  • 3
    Publication Date: 2019-07-13
    Description: Myogenic factor mRNA expression was examined during muscle regeneration after bupivacaine injection in Fischer 344/Brown Norway F1 rats aged 3, 18, and 31 mo of age (young, adult, and old, respectively). Mass of the tibialis anterior muscle in the young rats had recovered to control values by 21 days postbupivacaine injection but in adult and old rats remained 40% less than that of contralateral controls at 21 and 28 days of recovery. During muscle regeneration, myogenin mRNA was significantly increased in muscles of young, adult, and old rats 5 days after bupivacaine injection. Subsequently, myogenin mRNA levels in young rat muscle decreased to postinjection control values by day 21 but did not return to control values in 28-day regenerating muscles of adult and old rats. The expression of MyoD mRNA was also increased in muscles at day 5 of regeneration in young, adult, and old rats, decreased to control levels by day 14 in young and adult rats, and remained elevated in the old rats for 28 days. In summary, either a diminished ability to downregulate myogenin and MyoD mRNAs in regenerating muscle occurs in old rat muscles, or the continuing myogenic effort includes elevated expression of these mRNAs.
    Keywords: Life Sciences (General)
    Type: Journal of applied physiology (Bethesda, Md. : 1985) (ISSN 8750-7587); 83; 4; 1270-5
    Format: text
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  • 4
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: trans-4,4,10-Trimethyl-9-decalone ( = trans-5,5,8a-trimethyl-octahydronaphthalen-1(2H)-one; 1), when treated with trifluoroperacetic acid, gave the unexpected hydroxyspirolactone 7-hydroxy-7,11,11-trimethyl-1-oxaspiro[5.5]undecan-2-one (6), in which the two new O-atoms were introduced in a 1,2-trans relationship. The structure of this compound was conclusively proven by X-ray crystallography. The process involves the intermediacy of 7-membered lactone 2, the expected Baeyer-Villiger product, which could also be successfully prepared under controlled conditions at 0° in a buffered medium containing Na2HPO4.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 26 (1995), S. 147-147 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 281-304 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Fluates as binding media in the production of chemically resistant and capillary-tight cement and concrete1According to a new theoretical conception of the author, a clearer picture of the processes of hydration and hydraulic hardening in mortar was obtained as a result of obtaining an attack-resisting binder of the cement lime by means of a planned chemical transformation with fluates, and also through the clarification of their reaction mechanism; and this indicates new ways of determining the factors which influence chemical attack on concrete. By these means it was proved that the conventional view of these processes is not correct and must be critically re-examined.2Fluates contained in the mixing water cause a change in the mortar-like properties of the cement and improve working quality, strength capillary density and resistance to attack. Fluates are thus suitable ingredients for the production of resistant, dense cement-mortar and concrete; they influence its useful life and applications range.3Results of laboratory experiments are confirmed by manifold practical experience over long periods of observation. In view of this agreement of results the new knowledge is of fundamental practical and theoretical importance in the solution of the problem of attack on cement.
    Notes: 1Nach einer neuen zementtheoretischen Anschauung des Verfassers wurde durch die aggressionsbeständige Bindung des Kalkhydrats des Zements mittels einer gezielten chemischen Umsetzung durch Fluate und die Aufklärung ihres Reaktionsmechanismus eine vertiefte Vorstellung über die Vorgänge der Hydratation und der hydraulischen Erhärtung im Mörtelbett gewonnen und damit neue Wege zur Feststellung der die Betonaggression bestimmenden Einflußfaktoren aufgezeigt. Es konnte dadurch nachgewiesen werden, daß die bisherigen Anschauungen Über diese Vorgänge nicht zutreffen und einer kritischen Überprüfung unterzogen werden müssen.2Fluate im Anmachewasser bewirken eine Veränderung der mörteltechnischen Eigenschaften des Zements und verbessern dadurch Verarbeitbarkeit, Festigkeit, Kapillardichte und Aggressionsbeständigkeit. Demnach sind Fluate Zementwirkstoffe zur Herstellung von aggressivbeständigem, kapillardichtem Zementmörtel und Beton, wodurch deren Gebrauchsdauer und Anwendbarkeit entscheidend beeinflußt wird.2Laboratoriumsmäßige Untersuchungsergebnisse werden durch vielseitige praktische Erfahrungen nach langen Beobachtungszeiten bestätigt. Im Hinblick auf diese Übereinstimmung sind die neuen Erkenntnisse für die Lösung des Problems der Betonaggression theoretisch und praktisch von grundlegender Bedeutung.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: On the Importance of the Hydrate of Lime in Cement Mortar an Concrete against Aggression and of its Resistant Setting by Chemical Reactions during Hydration1The evaluation and interpretation of analytic and physical long term experiments with concretes made of Portland and blast furnace cements which were stored in aggressive agents, shows that the results agree to the theory of cements of the author. On this basis the hydration and cementation processes in the mortar beds as well as the causes and the mechanism of the corrosion of concrete are discerned. As the results of several testing methods and of different evaluation principles are agreeing, theoretically, the experimental results are of general and principle importance.2By means of a chemical reation a resistant setting of the hydrate of lime in the liquid phase during hydration was made possible. The so caused inhibition of the primary aggression allowed to increase the resistance of concretes of standard cements to a level never achieved before.
    Notes: 1Durch die Auswertung und Deutung von Langzeitversuchen, analytischen und physikalischen Untersuchungsergebnissen mit Beton aus Portlandzement und Hochofenzement bei Lagerung in aggressiven Medien ist es gelungen, einc neue zementtheoretische Anschauung des Verfassers zu bestätigen und davon ausgehend zur Klärung der Hydratations- und Erhärtungsvorgänge im Mörtelbett sowohl als auch der Ursachen und des Verlaufs der Betonaggression beizutragen. Die Untersuchungsergebnisse sind im Himblick auf ihre Übereinstimmung nach verschiedenen Prüfmethoden und den verschiedensten Auswertungsunterlagen nach Herstellungsart und Durchführungszeit theoretisch von allgemeingültiger und grundsätzlicher Bedeutung.2Durch die aggressionsbeständige Bindung des Kalkhydrats des Zements in der flüssigen Phase durch eine gezielte chemische Umsetzung während der Hydratation und die dadurch verursachte Hemmung bzw. Stillegung der Primäraggression wurde es möglich, Beton aus Normenzementen auf einfache Weise eine Aggressionsbeständigkeit zu geben, wie sie bisher noch nicht erreicht werden konnte.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 739-760 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: On the causes and progress of aggression due to the attack of corrosive waters on cement mortar and concrete(First Communication)This First Communication presents a comparative synopsis of present knowledge and experience of the causes and progress of aggression, with special regard to recent developments, during the attack of corrosive waters on cement mortar and concrete, in as much as these are relevant to the causal relationship between cause and effect and to the processes during concrete corrosion in the mortar bed. This communication also deals with the different measures to enhance the corrosion resistence in concrete practice, and the influence of these measures on the concrete properties.
    Notes: In der 1. Mitteilung werden die bisherigen Erkenntnisse und Erfahrungen über die Ursachen und den Verlauf der Aggression unter besonderer Berücksichtigung neuerer Entwicklungen bei Einwirkung angreifender Wässer auf Zementmörtel und Beton, soweit diese im Hinblick auf den kausalen Zusammenhang zwischen Ursache und Wirkung und die Vorgänge bei der Betonaggression im Mörtelbett wesentlich sind, vergleichend zusammengefaßt und die verschiedenen Maßnahmen zur Erhöhung der Aggressionsbeständigkeit in der Betonpraxis und deren Einfluß auf die Betoneigenschaften behandelt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 414-414 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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