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  • Chemistry  (2)
  • Biophysical instrumentation and techniques  (1)
  • 1
    ISSN: 0392-6737
    Keywords: Biophysical instrumentation and techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto È stato usato un apparato di misurazione a un fotone per misurare la chemiluminescenza emessa durante la perossidazione dei fosfolipidi della membrana cellulare di un cuore di ratto isolato e perfuso sottoposto ad uno stress perossidativo. Lo stress perossidativo è stato ottenuto aggiungendo idroperossidi al liquido di perfusione. I differenti idroperossidi usati hanno prodotto tipiche evoluzioni temporali di chemi-luminescenza altamente riproducibili. La disponibilità di ossigeno influenza fortemente l'intensità e la cinetica di emissione della chemiluminescenza. Nell'àmbito di uno studio sull'effetto di differenti idroperossidi sul cuore di ratto isolato e perfuso, la misura della chemiluminescenza si è dimostrata un interessante e promettente strumento per il monitoraggio in continuo dei danni perossidativi nelle membrane biologiche. La sensibilità di questo metodo per la valutazione della perossidazione dei fosfolipidi delle biomembrane è circa dieci volte maggiore rispetto agli ordinari metodi di chimica analitica.
    Abstract: Резюме В этой статъе описывается аппаратура для ретистрации отделъных фотонов для непрерывного мониторнта улътраслабой хемилюминесценции, испус-каемой во время пероксидации фосфолипидов клеточной мембраны изолированного и перфузированного сердца крысы. В частности, аппаратура для ретистрации отделъ-ных фотонов исполъзуется для оценки напряжениь, индуцированных в сердце при добавлении тидроперекиси в пербузирующую жидкостъ. для этого исполъзуутся различные тидропероксиды, которые дают типичные временные эволюции улътса-слабой хемиюминесценции. Также получается, что наличие кислорода силъно влияет на интенсивиостъ и кинетику улътраслабои хемилюминесценции. Показывается, что улътраслабая хемилюминесценция представляет оченъ интересный и перспективный инструмент для мониторинга пероксидативных повреждений биологических мембран. Чувствителъностъ этого метода для пценки пероксидации босболинидов биомембран почти в десятъ раз выше, чем обычнын методов аналитической химии.
    Notes: Summary This paper describes the use of a single-photon counting apparatus (SPCA) for the continuous monitoring of the ultraweak chemiluminescence (UWC) emitted by isolated and perfused rat hearts and deriving from phospholipid peroxydation. Specifically the SPCA was used to assess the peroxidative stress induced in the heart by the addition of an hydroperoxide to the perfusing medium. To this purpose, different hydroperoxides were used and each one produced a tipical and highly reliable temporal evolution of UWC. It was also found that the oxygen availability strongly influences the intensity and the kinetic of the UWC emission. UWC was proved to be a very interesting and promising tool for monitoring the peroxidative damage of biological membranes, both because it makes a continuous assessment possible and because the sensitivity of this method is approximately ten times greater than usual analytical chemistry methods.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0899-0042
    Keywords: optical resolution ; chiral HPLC ; chiral stationary phase ; 6-oxazolinylisoflavan ; circular dichroism ; antipicornavirus activity ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Racemic 6-oxazolinylisoflavan, a highly effective inhibitor of rhinovirus serotype 1B in vitro, was resolved by high-performance liquid chromatography on a chiral stationary phase in order to study the activity of the enantiomers against picornaviruses. The absolute configuration of the two isomers was determined by circular dichroism curves. The antipicornavirus activity of each isomer, separately collected, was evaluated in vitro against human rhinovirus serotype 1B, enterovirus 71, echovirus 6, coxsackievirus B4, and poliovirus type 2 by means of the plaque reduction assay. Both enantiomers were inhibitors of picornavirus replication with the degree of their activity depending on virus and isomer tested. © 1993 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 23 (1992), S. 155-160 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman excitation profile for the 220 cm-1 mode of trans-azobenzene in cyclohexane solution was measured in resonance with the π-π* transition peaked around 320 nm. A strong modulation of the band intensity across the first vibrational feature of the poorly resolved absorption spectrum was detected. The collected data were analysed by means of the time-correlator theory and of a Franck-Condon model to derive some molecular parameters of the excited electron state.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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