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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 261 (1972), S. 354-358 
    ISSN: 1618-2650
    Keywords: Analyse von Carbonsäuren (Citratcyelus) ; durch Chromatographie ; Säule im nVal-Bereich
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird über die Analyse von Citratcyclusintermediaten mit Hilfe der modernen Flüssigkeits-Chromatographie (LC) berichtet. Der photometrische Nachweis der kurzkettigen Carbonsäuren im Säuleneluat erfolgt mit Hilfe eines gruppenspezifischen Indicators (o-Nitro-Phenol). Bei gradientenfreier Elution beträgt der Rauschpegel der Basislinie des Chromatogramms max. 1 · 10−3 E und der Flächenwert für 10 nVal Essigsäure 25 E · sec. Bei wiederholten Probenaufgaben betragen die Abweichungen vom Flächenmittelwert max. ± 5% (VB 95%). Die Aufbereitung biologischer Proben erfolgt durch Extraktion mit Diäthyläther in einer einfachen säulen-chromatographischen Anlage, die gleichzeitig der Vortrennung sog. „kritischer Säurenpaare” dient. Die Anwendbarkeit der LC auf die Analyse von biologischem Material wird mit einem Chromatogramm von 10 μl Humanserum gezeigt.
    Notes: Abstract The analysis of TCA intermediates and related compounds with modern liquid chromatography (LC) is described. Short-chain carboxylic acids are detected by adding a compound specific indicator (o-nitro-phenol) to the eluent. Without gradient elution, the noise level of the chromatogram baseline does not exceed 1×10−3 O.D. and the peak area for 10 nanoequivalent acetic acid is 25 absorbance seconds. With repeated applications of sample to column, deviations of 5% of the medium peak area value are not exceeded (range of confidence 95%). Preparation of the biological samples is achieved by ether extraction with a simple column-chromatography apparatus, which at the same time, preseparates critical acids otherwise not completely separable by elution without gradient. The application of LC to the analysis of biological material is demonstrated by a chromatogram of 10 μl of human serum.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2021-05-19
    Description: El presente artículo da una descripción detallada de la elaboración y del "curado" de cuerdas de curricán, utilizadas anteriormente para la pesca en Taganga, un pueblo pescador en la costa norte de Colombia. Antes del "curado", estas cuerdas de fibras de algodón y de fabricación industrial, eran o destorcidas o torcidas a mano nuevamente, o tensionadas y envueltas con una cuerda más delgada del mismo material. El "curado" que siguió a estas operaciones se efectuó tanto en una cocción de corteza de las raíces zanconas de mangle, y/o por medio de un frote de estas cuerdas con los hypocotylos del mismo árbol (Rhizophora manglr). Por medio de las técnicas aquí descritas, los pescadores aspiraban a aumentar la resistencia de sus aparejos de pesca en el agua de mar.
    Description: The present paper gives a detailed description of the elaboration and curing of curricán Unes, formerly used as fishing lines in Taganga, a small fishing village on the northem coast of Colombia. These lines, made of cotton fibers and produced industrially, were disassembled and then retwisted by hand, or tightened and then carefully covered with a thinner string of the same material. The curing {"curado") that followed these operations was achieved by immersion of the lines into a boiled infusión of the bark of the prop roots of mangroves (Rhizophora mangle) and/or a rinsing with the hypocotyls of the same trees. By means of the techniques mentioned, the fishermen sought to improve the resistance of their fishing gear to sea water.
    Description: Published
    Keywords: Fisheries ; Fishing ; Gear construction ; Fisheries ; Fishing
    Repository Name: AquaDocs
    Type: Journal Contribution
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