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  • Springer  (71)
  • American Physical Society (APS)
  • 1975-1979  (71)
  • 1
    Electronic Resource
    Electronic Resource
    Integrated assessment and evaluation of the coastal environment of the province of vizcaya, bay of Biscay, Spain (1978)
    Springer
    Environmental geology 2 (1978), S. 321-331 
    Details
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A methodology for the quick, overall assessment of the capability of different parts of a coastal environment to be used for human activities is described. The methodology is based on the elaboration of a series of thematic maps (geologic, biologic, and dynamic, e.g., currents, features) for the three “environmental systems” that were defined (marine, estuarine, and emerged coastline). The thematic maps are combined to define “homogeneous units” and these are then evaluated for the attractiveness and impact corresponding to a series of selected activities. Alternatively, the mapped features can be evaluated directly for certain systems, without defining homogeneous units. The combination of attractiveness and impact is used to obtain the relative capability of each unit for each activity, thus establishing the activities that are most advisable in each case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380506
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal properties of Jojoba wax (1979)
    Springer
    Journal of thermal analysis and calorimetry 17 (1979), S. 151-158 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a étudié, par analyse calorimétrique différentielle dans une atmosphère dynamique d'oxygène, la résistance à l'oxidation thermique de la cire Jojoba (Simmondsia chinensis). On a calculé l'énergie d'activation (Ea) de l'oxydation thermique en déterminant la température maximale (Tm) de la réaction à diverses vitesses de chauffage (Hr) et en utilisant les modèles mathématiques déjà proposés pour des systèmes dynamiques. La valeur obtenue est 21.84 kcal/mole. On a calculé également les enthalpies d'oxydation (δHox) et on a trouvé des corrélations linéaires entre les racines carrées de la vitesse de chauffage et la température initiale de l'oxydation thermique.
    Abstract: Zusammenfassung Die thermooxidative StabilitÄt von Jojoba-Wax (Simmondsia chinensis) wurde durch Differential-Abtastkalorimetrie in dynamischer SauerstoffatmosphÄre untersucht. Die Aktivierungsenergie der Thermooxidation (Ea) wurde durch die Bestimmung der maximalen Reaktionstemperatur (Tm) bei verschiedenen Aufheizgeschwindigkeiten (Hr) unter Anwendung der vorhergehend für dynamische Systeme vorgeschlagenen mathematischen Modelle berechnet. Der erhaltene Wert betrug 21.84 Kcal/Mol. Die OxidationsenthalpienδH ox wurden ebenfalls berechnet und lineare ZusammenhÄnge mit der Quadratwurzel der Aufheizgeschwindigkeit und der Anfangstemperatur der Thermooxidation wurden gefunden.
    Notes: Abstract The thermo-oxidative stability of Jojoba wax (Simmondsia chinensis) was studied by differential scanning calorimetry in a dynamic oxygen atmosphere. The thermo-oxidation activation energy (Ea) was calculated by determining the maximum reaction temperature (Tm) at different heating rates (Hr) and using mathematical models previously proposed for dynamic systems. The value obtained was 21.84 Kcal/mol. The oxidation enthalpiesδH ox were also calculated and a lineal relationship was found with the square root of the heating rate and the initial temperature of thermo-oxidation
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02156609
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal properties of jojoba wax (1979)
    Springer
    Journal of thermal analysis and calorimetry 15 (1979), S. 315-323 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Le comportement thermique de la cire liquide de Jojoba (Simmondsia chinensis) a été étudié par analyse calorimétrique différentielle (DSC) en faisant varier les conditions de recuit. L'enthapie de fusion (ΔH f) de l'échantillon non recuit est de 27,12 cal/g; le rapport entre la chaleur spécifique (C p) et la température a pu être exprimé par l'équation suivante:C p=9.51×10−4T+0.129. On a trouvé que la cire de Jojoba présente quatre transitions endothermiques (α, β, γ etδ) en incluant la fusionα, décelable aux faibles vitesses de chauffage (1°/min); les énergies d'activation respectives (E ac) se sont élevées à 51.18 et 64.82 kcal/mol pour les transtions a etγ sont en relation linéaire avec la racine carrée de la vitesse de chauffage (H r).
    Abstract: Zusammenfassung Das thermische Verhalten des flüßigen Wachses von Jojoba (Simmondsia chinensis) wurde durch Differential-Abtastkalorimetrie (DSC) unter Änderung der Wärmebehandlungsbedingungen untersucht. Die Schmelzenthalpie (ΔHf) des unbehandelten Materials betrug 27.12 cal/g; der Zusammenhang zwischen der Wärmekapazität (C p) und der Temperatur konnte durch folgende Gleichung ausgedrückt werden:Cp=9.51×10−4T+ +0.129. Es wurde festgestellt, daß das Jojoba-Wachs vier endotherme Übergänge (α, β, γ undδ) aufweist, darunter die Schmelzeα, die bei niedrigen Aufheizgeschwindigkeiten zu ermitteln ist (1°K/min); die Aktivierungsenergien (Eac) für die Übergängeα undγ betrugen 51.18 bzw. 64.82 Kcal/mol. Es wurde beobachtet, daß die Übergangstemperaturenα undγ in linearem Zusammenhang mit der Quadratwurzel der Aufheizgeschwindigkeit (Hr) waren.
    Notes: Abstract The thermal behaviour of Jojoba (Simmondsia chinensis) liquid wax was studied by differential scanning calorimetry (DSC), varying the annealing conditions. The fusion enthalpy (ΔHf) of the unannealed material was 27.1 cal/g; the relationship between heat capacity (Cp) and temperature could be expressed by the following equation:Cp=9.51×10−4 T+0.129. It was found that Jojoba wax presents four endothermic transitions (α, β, γ andδ) including fusionα, estimable at low heating rates (1 K/min); the activation energies (Ea) for transitionsα andγ were 51.18 and 64.82 Kcal/mole respectively; and it was observed that the transition temperaturesα andγ maintained a lineal relationship with the square root of the heating rate (Hr).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01903655
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  • 4
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    Integrated assessment and evaluation of the coastal environment of the province of vizcaya, bay of Biscay, Spain (1978)
    Springer
    Details
    Publication Date: 1978-11-01
    Print ISSN: 0943-0105
    Electronic ISSN: 1432-0495
    Topics: Geosciences
    Published by Springer
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    PAPER CURRENT
  • 5
    Electronic Resource
    Electronic Resource
    Responses of an estuarine population of the blue mussel Mytilus edulis to heated water from a steam generating plant (1976)
    Springer
    Marine biology 34 (1976), S. 177-189 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An entire bed of the blue mussel Mytilus edulis, consisting of 5,000 individuals/m2, died during June, 1971 in the effluent canal of a steam generating plant when the temperature increased above 27°C. Similarly, the population in the intake canal disappeared when temperatures rose above 27°C in August. Laboratory studies showed that M. edulis could not tolerate continuous temperatures above 27°C, and feeding stopped shortly after the mussels were exposed to 25°C. Histopathological studies indicated that the cause of death of this bivalve was associated with degeneration of the frontal and laterofrontal cilia of the columnar epithelium of the gill filaments. In conjuction with this, there was necrosis and sloughing of the epithelium of the intestinal diverticula. Extensive amoebocytic infiltration was noted in the byssogenous cavity, gill filaments and stomach wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390760
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  • 6
    Electronic Resource
    Electronic Resource
    Critical thermal maxima of two species of estuarine fish (1977)
    Springer
    Marine biology 41 (1977), S. 141-145 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Critical thermal maxima (CTM) were determined for winter flounder (Pseudopleuronectes americanus, Walbaum) and scup (Stenotomus chrysops, L.), acclimated to ambient water temperature or constant increments above ambient. The acclimation regimes simulated a natural environment by tracking the temperature fluctuations in Point Judith Pond, a small Rhode Island estuary. An elevation in CTM from 30.2° to 35.6°C was observed for scup as the mean acclimation temperature increased from 14.8° to 22.2°C. CTM for flounder increased from 26.4° to 32.4°C over an acclimation range of 4.2° to 23.0°C. The use of CTM studies for predicting the effects of heated effluents is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394021
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  • 7
    Electronic Resource
    Electronic Resource
    Sulfatide content and (Na++K+)-ATPase activity of skin and gill during larval development of the chilean frog,Calyptocephalella caudiverbera (1979)
    Springer
    The journal of membrane biology 51 (1979), S. 347-359 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary The sulfatide content, phospholipid concentration, and (Na++K+)-ATPase activity from skin and gills of different stages of larval development ofCalyptocephalella caudiverbera (a Chilean frog) were analyzed. Additionally, the short-circuit current in skin was studied. When skin and gills, depending on the stage of larval development, present (Na++K+)-ATPase activity, they have a high ratio of sulfatide to amount of membrane and the phosphatidylserine concentration remains unchanged. Sulfatide content and (Na++K+)-ATPase activity in skin are in direct relationship with the level of sodium flux present during development. The specific enzymatic hydrolysis of sulfatide with partially purified arylsulfatase of pig kidney inhibits 100% of the ouabain-sensitive (Na++K+)-ATPase. The ouabain-insensitive ATPase remains virtually unchanged with the treatment, even with a high concentration of arylsulfatase or with ouabain present in the medium. These experiments strongly suggest a role of sulfatides in the (Na++K+)-ATPase activity and, as a consequence, in sodium ion transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01869091
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  • 8
    Electronic Resource
    Electronic Resource
    Clothing insulation as a biometeorological parameter during rest and exercise (1978)
    Springer
    International journal of biometeorology 22 (1978), S. 177-189 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract A method of direct measurement of the heat and vapor transfer properties of clothing is described when worn in situ by human subjects during rest and exercise. Additional experimental observations were used to verify that a model for predicting Fpcl is reasonably accurate. From the thermal efficiency factor (Fcl), derived from $$\bar T$$ s and Tcl measurements, an effective value for Iclo can be determined and thus vapor permeation efficiency (Fpcl) can be predicted. A single coefficient (ψ) that characterizes the boundary environment over the skin surface is the ratio (hFcl)/(heFpcl) and is determined for any environment in terms of directly observed Fcl factor or clo value and relative air movement concerned. Ultimately,ψ-factor may be used as a key biometeorological parameter to describe any heat balance condition graphically on a psychrometric chart. Its usefulness is also evident in prediction of the probable combination of operative temperature and humidity necessary for thermal acceptable zones, the limits for evaporative regulation, and the zone in which some degree of thermal regulatory failure can be expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01555396
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  • 9
    Electronic Resource
    Electronic Resource
    Metabolic changes induced by galactose (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 153-154 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen La administracion de 100 g de galactosa a 9 voluntarios sanos por via oral, demostro ser capaz de elevar la insulinemia, sin modificar la glucosa en sangre. Secundariamente se aprecio un descenso de los acidos grasos libres. La galactosa puede actuar directamente sobre el pancreas o a traves del intestino.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990676
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrastructural evidence of a secretory process in the rat pineal gland (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 969-971 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Pericapillar spaces of the rat pineal gland belong to the most active sites of this organ. Neighborhood of sympathetic nerve endings, capillaries and pinealocyte processes facilitates possibly the synthesis and the secretion of methoxyindoles. Lipid droplets migrate through the pinealocyte cellular processes towards the terminal enlargement or poles, where they are secreted into the pericapillar space, and the possibility that indoleamines are included in the lipid droplets has been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358883
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