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  • 1980-1984  (22)
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Keywords
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Year
  • 1
    facet.materialart.
    Unknown
    Observation of manganese deposits on the East Pacific Rise during the CYAMEX-RITA expedition (1981)
    PANGAEA
    In:  Supplement to: Cyamex Scientific Team; Francheteau, Jean; Needham, H D; Choukroune, P; Juteau, Thierry; Séguret, Marie J M; Ballard, R D; Fox, P J; Normark, William R; Carranza, A; Cordoba, D; Guerrero, Gerardo; Rangin, Claude (1981): First manned submersible dives on the East Pacific Rise at 21�N (project RITA): General results. Marine Geophysical Research, 4(4), 345-379, https://doi.org/10.1007/BF00286034
    Details
    Publication Date: 2023-08-28
    Description: A submersible study has been conducted in February - March 1978 at the axis of the East Pacific Rise near 21°N. The expedition CYAMEX, the first submersible program to be conducted on the East Pacific Rise, is part of the French-American-Mexican project RITA (Rivera - Tamayo), a 3-year study devoted to detailed geological and geophysical investigations of the East Pacific Rise Crest. On the basis of the 15 dives made by CYANA in the axial area of the Rise, a morphological and tectonic zonation can be established for this moderately-fast spreading center. A narrow, 0.6 to 1.2 km wide zone of extrusion (zone 1), dominated by young lava flows, is flanked by a highly fissured and faulted zone of extension (zone 2) with a width of 1 to 2 km. Further out, zone 3 is dominated by outward tilted blocks bounded by inward-facing fault scarps. Active or recent faults extend up to 12 km from the axis of extrusion of the East Pacific Rise. This represents the first determination from direct field evidence of the width of active tectonism associated with an accreting plate boundary. Massive sulfide deposits, made principally of zinc, copper and iron, were found close to the axis of the Rise. Other signs of the intense hydrothermal activity included the discovery of benthic fauna of giant size similar to that found at the axis of the Galapagos Rift. We emphasize the cyclic character of the volcanicity. The main characteristics of the geology of this segment of the East Pacific Rise can be explained by the thermal structure at depth below this moderately-fast spreading center. The geological observations are compatible with the existence of a shallow magma reservoir centered at the axis of the Rise with a half-width of the order of 10 km.
    Keywords: CY78-16DF; CY78-17V; CY78-18V; CYAMEX; Cyana (Submersible); Deposit type; DEPTH, sediment/rock; Description; East Pacific Rise; Event label; Identification; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; OBSE; Observation; Position; Quantity of deposit; Sediment sample; Sediment type; SES; Substrate type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 21 data points
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Observation of manganese deposits on the East Pacific Rise during the CYAMEX-RITA expedition (1980)
    PANGAEA
    In:  Supplement to: Juteau, Thierry; Eissen, Jean-Philippe; Francheteau, Jean; Needham, David; Choukroune, P; Rangin, Claude; Séguret, Marie J M; Ballard, R D; Fox, P J; Normark, William R; Carranza, A; Cordoba, D; Guerrero, J (1980): Homogeneous basalts from the East Pacific Rise at 21° N: seady state magma reservoirs at moderately fast spreading centers. Oceanologica Acta, 3(4), 487-503, https://archimer.ifremer.fr/doc/00323/43430/
    Details
    Publication Date: 2023-08-28
    Description: Forty basaltic rocks collected by submersible during the Cyamex expedition (1978) on the East PacifIc Rise at 21°N, a moderately fast spreading segment (6 cm/year opening rate) of the mid-ocean ridge, consist of angular pillow fragments and glass buds, sheet-flow slabs and samples of columnar pillars standing in collapsed fossillava pools. Most of the rocks are from the crestal are a of the Rise. The collection shows a striking petrographic homogeneity wh en compared with the range of basalts found on other segments of midocean ridges: olivine-phyric, or highly plagioclase-phyric rocks, so common in the slowspreading Famous are a in the Atlantic, are absent. All samples are typical lowpotassium oceanic tholeiites with a limited fractionation trend. Pillow-lavas, thin and thick sheet-flows cannot be distinguished by their major element compositions, as in the Galapagos rift which has the same spreading rate as the EPR at 21°N. Further, ferrobasalts have been described from the Galapagos rift, but do not appear in the Cyamex rocks. In the Cyamex area, olivine and plagioclase are the main silicate phases, and clinopyroxene is absent. In the pillows and sheet-flow samples, four generations of olivine and plagioclase crystals are distinguished. Samples from the fossillava pools are aphyric. The corresponding magma batches are presumed to have migrated rapidly through the magma chamber, and to have been extruded in large volumes, possibly during episodes ofhigh instantaneous opening rate. Fe-Ni and Fe-Cu-rich sulphide phases are common in an lava types as massive globules scatterred through the glass, or as microglobules decorating the walls of empty vesicles. Palagonite and Fe-Mn oxide thicknesses across the strike of the Rise indicate relative ages compatible with successive extrusions at the Rise axis.
    Keywords: CY-78-07-12D; CY-78-10-17D; CY-78-10-18D; CY-78-11-26D; CY-78-12-35D; CY-78-13-42D; CY-78-13-43D; CY-78-13-44D; CY-78-15-55D; CY-78-15-56D; CY-78-16-57D; CY-78-16-58D; CY-78-17-60D; CY-78-17-61D; CY-78-18-63D; CY-78-18-65D; CY-78-18-66D; CY-78-19-69D; CY-78-20-76D; CYAMEX; Cyana (Submersible); Deposit type; DEPTH, sediment/rock; Description; East Pacific Rise; Elevation of event; Event label; Identification; Latitude of event; Longitude of event; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Percentage; Position; ROBA; Robotic arm; Sediment type; Substrate type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 108 data points
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    DATA PANGAEA
  • 3
    Electronic Resource
    Electronic Resource
    Chronopotentiometry with programmed current at a dropping mercury electrode (1984)
    s.l. : American Chemical Society
    Analytical chemistry 56 (1984), S. 887-890 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00270a007
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Pure and mixed monolayers of poly-L-methionine and poly-γy-methyl-L-glutamate with 1,2 dioleyl-L-α-phosphatidylcholine at air-water interface (1984)
    Springer
    Colloid & polymer science 262 (1984), S. 811-816 
    Details
    ISSN: 1435-1536
    Keywords: monolayers ; α-helical form ; plateau region ; islets ; hysteresis cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Monolayers of poly-L-methionine (PM) and poly-γ-methyl-L-glutamate (PMG), spread at an air-water interface, exhibit a high compressibility plateau region at 10 dyn/cm and 18 dyn/cm in their respectiveπ-A curves. This behaviour is related to aα-helical conformation of the polypeptide molecules in the said interface. Comparative studies of the areas per residue observed in the spreading isotherms, with the areas calculated from molecular models, indicate that the polypeptide molecules should be associated in parallel, forming islets of at least 5α-helix chains. Mixed monolayers corresponding to the poly-L-methionine (PM)-1,2 dioleyl-L-α-phosphatidylcholine (DOPC) and poly-γ-methyl-L-glutamate (PMG)-1,2 dioleyl-L-α-phosphatidylcholine (DOPC) systems, follow, in every case, the additivity rule for monolayer composition, any indicating that its components are insoluble in the surface mixture. In the case of mixed monolayers of PM-DOPC, a certain degree of compatibility is possible among its components, as a modulation of the plateau region is observed in the spreading isotherms, while for the PMG-DOPC system the plateau region appears at the same surface pressure value as the isotherm corresponding to pure PMG polypeptide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01451712
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  • 5
    Electronic Resource
    Electronic Resource
    HLA antigens in a sample of the Spanish population: Common features among Spaniards, Basques, and Sardinians (1981)
    Springer
    Human genetics 〈Berlin〉 58 (1981), S. 344-348 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Frequencies of recently described HLA-A,-B (antigens or splits) and HLA-C and HLA-DR antigens are studied in a 450 normal Spaniards sample. The linkage disequilibria are also calculated. HLA-DR7 is more frequent than in any other population studied. Aw30-B18 and Aw33-B14 associations are common and specific Spanish, Basque, and Sardinian HLA features. A11-B27 association is found in our Spanish sample and also in Basques. HLA-Bw4,-Bw6 antigens are analyzed by family mating and segregation and also using unrelated individuals. It shows a good fit as a genetic system. HLA-B antigens are included either in Bw4 or Bw6 according to expectations from other Caucasoid population results. The possibility of a common and North African origen (Iberians) for Spaniards, Basques, and Sardinians is discussed on the basis of presently available HLA data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294935
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  • 6
    Electronic Resource
    Electronic Resource
    Single cell protein production from bagasse pith pretreated with sodium hydroxide at room temperature (1984)
    Springer
    Applied microbiology and biotechnology 20 (1984), S. 335-339 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Previous publications have revealed that a pretreatment of lignocellulosic wastes is necessary if they are to be employed as the hydrocarbon source of single cell protein production. A hot alkaline treatment is the most common. We have treated sugar cane bagasse pith with 1% NaOH solution at room temperature, at a NaOH/pith ratio of 10%. Different contact times were used in the experiments. The shortest contact period required for maximum protein production was 24 h at 25° C. A mixed culture of Cellulomonas sp. and Bacillus subtilis was used in the experiments. The values obtained for hemicellulose and cellulose in the treated pith did not differ greatly from those of untreated pith, in contrast the amount of lignin was 33% lower in the treated pith. The effect of reutilization of the alkaline liquor used for the pretreatment of pith upon protein production was also investigated. With four recyclings, there was a NaOH saving of 34.4 kg per 100 kg produced protein as compared to when the liquor was only used once. The quality of the resulting effluents, as measured by the chemical oxygen demand (COD), proved to be very similar for both types of treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270596
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  • 7
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of mercury with thiocyanate and Rhodamine B (1984)
    Springer
    Microchimica acta 84 (1984), S. 467-475 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In Gegenwart eines großen Überschusses von Rhodanid bildet Hg(II) mit Rhodamin B eine violette Färbung. Durch Zusatz von Polyvinylalkohol kann dieser Komplex stabilisiert werden und bietet somit die Grundlage für die spektrophotometrische Bestimmung von Hg-Spuren. Die Eichkurve für die Messung bei 610 nm verläuft für 1–15μg Hg/25 ml linear. Die molare Absorptivität beträgt 1,1×105 l·mol−1·cm−1. Die Fremdionenwirkung wurde untersucht. Das Verfahren kann zur Hg-Bestimmung in Luft verwendet werden.
    Notes: Summary Mercury(II) in the presence of a large excess of thiocyanate forms a violet colour with Rhodamine B. The complex formed can be stabilized by addition of poly(vinyl alcohol), and forms the basis for a spectrophotometric method for determination of trace amounts of mercury. The calibration graph for measurement at 610 nm is linear in the range 1–15μg of mercury per 25 ml, with a molar absorptivity of 1.1×105l· mole−1·cm·. The effect of foreign ions has been studied and the method can be applied to the determination of mercury in air with reliable analytical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197161
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  • 8
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of gold with 2-(p-methoxyphenyl)-5,7-diphenyl-1,3,4-thiadiazolo-(3,2-a)-pyridinium chloride (1983)
    Springer
    Microchimica acta 79 (1983), S. 395-401 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In 0,4 M Salzsäure bildet Gold(III) mit TDZP eine Ionenassoziationsverbindung, die sich mit Isoamylacetat extrahieren läßt. Diese im Molverhältnis Au:TDZP=1∶1 zusammengesetzte Verbindung dient zur spektrophotometrischen Goldbestimmung (ε=3,80 x 104l·Mol−1·cm−1) im Konzentrationsbeieich 1–25μg Au/5 ml organisches Lösungsmittel. Die störende Wirkung von Fremdionen wurde untersucht. Das Verfahren eignet sich zur Goldbestimmung in Erzen.
    Notes: Summary In 0.4M hydrochloric acid medium, gold(III) forms with 2-(p-methoxyphenyl)-5,7-diphenyl-1,3,4-thiadiazolo(3,2-a)pyridinium chloride (TDZP) an ion-association compound which is extractable into isoamyl acetate. The extracted ion-pair, which has an Au:TDZP mole ratio of 1∶1, is used for the spectrophotometric determination of gold (ε=3.80 x 104l·mole−1·cm−1) in the concentration range 1–25μg of gold per 5 ml of organic solvent. The interference of a number of foreign ions has been investigated. The method is applicable to the determination of gold in ores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204822
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  • 9
    Electronic Resource
    Electronic Resource
    First manned submersible dives on the East Pacific Rise at 21°N (project RITA): General results (1981)
    Springer
    Marine geophysical researches 4 (1981), S. 345-379 
    Details
    ISSN: 1573-0581
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A submersible study has been conducted in February–March 1978 at the axis of the East Pacific Rise near 21°N. The expedition CYAMEX, the first submersible program to be conducted on the East Pacific Rise, is part of the French-American-Mexican project RITA (Rivera-Tamayo), a 3-year study devoted to detailed geological and geophysical investigations of the East Pacific Rise Crest. On the basis of the 15 dives made by CYANA in the axial area of the Rise, a morphological and tectonic zonation can be established for this moderately-fast spreading center. A narrow, 0.6 to 1.2 km wide zone of extrusion (zone 1), dominated by young lava flows, is flanked by a highly fissured and faulted zone of extension (zone 2) with a width of 1 to 2 km. Further out, zone 3 is dominated by outward tilted blocks bounded by inward-facing fault scarps. Active or recent faults extend up to 12 km from the axis of extrusion of the East Pacific Rise. This represents the first determination from direct field evidence of the width of active tectonism associated with an accreting plate boundary. Massive sulfide deposits, made principally of zinc, copper and iron, were found close to the axis of the Rise. Other signs of the intense hydrothermal activity included the discovery of benthic fauna of gian size similar to that found at the axis of the Galapagos Rift. We emphasize the cyclic character of the volcanicity. The main characteristics of the geology of this segment of the East Pacific Rise can be explained by the thermal structure at depth below this moderately-fast spreading center. The geological observations are compatible with the existence of a shallow magma reservoir centered at the axis of the Rise with a half-width of the order of 10 km.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286034
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and crystal structure of 4,4′(1,2-ethanediyldiimino)bis(1,1,1-trichloro-3-penten-2-one) (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 485-491 
    Details
    ISSN: 1434-4475
    Keywords: Electron accepting ability of—CCl3 ; Schiff base
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird über die Darstellung, Charakterisierung und Kristallstruktur derSchiff-Base berichtet, die aus 1,1,1-Trichloracetylaceton und Ethylendiamin erhalten wurde. Die Röntgenstrukturanalyse zeigte, daß es sich um 4,4′(1,1-Ethandiyldiimino)bis(1,1,1-trichlor-3-penten-2-on) handelt. Dies impliziert, daß die Elektronacceptorfähgkeit der CCl3-Gruppe eine größere Partialladung δ + im entfernteren Carbonyl induziert. Die Verbindung besitzt im Kristall zwei verschiedene Konformationen. Es wurde eine N-H----O-Wasserstoff-brückenbinding festgestellt.
    Notes: Abstract The preparation, characterization and crystal structure of theSchiff base obtained from 1,1,1-trichloroacetylacetone and ethylenediamine is reported. The structural determination shows that the compound is 4,4′(1,1-ethanediyldiimino)bis(1,1,1-trichloro-3-penten-2-one), it suggests that the electron accepting ability of the CCl3 group induces a larger δ + charge on the remote carbonyl. In the solid state it occurs in two different conformations and N-H ----O hydrogen bond is present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810010
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