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  • 1
    Electronic Resource
    Electronic Resource
    Purification and characterization of S-adenosyl-L-methionine decarboxylase from rat liver (1972)
    s.l. : American Chemical Society
    Biochemistry 11 (1972), S. 671-677 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00755a002
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  • 2
    Electronic Resource
    Electronic Resource
    Sulfide geochemistry and genesis of Chouichia and Ain el Bey copper deposits in northwestern Tunisia (1996)
    Springer
    Mineralium deposita 31 (1996), S. 188-200 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Chouichia and Ain el Bey copper veins that occur in the Eastern Atlas fold belt in northwestern Tunisia, are hosted in Upper Cretaceous-Paleogene sedimentary sequences in a regional transcurrent shear zone. Paragenetic assemblages were formed during four distinct stages all of which are separated by fracturing and brecciation: Stage 1 consists of low temperature siderite (160–180 °C) formation in association with pyrite, including framboidal pyrite and marcasite. Stage 2 includes pseudomorphing of marcasite by As-rich pyrite and arsenopyrite, and formation of chalcopyrite at higher temperatures (200–300 °C) from S-rich, Fe-Cu-bearing fluids; As contents in individual pyrite and arsenopyrite crystals increase markedly in the rims relative to the centers, thus indicating non-equilibrium conditions. Stage 3 involves fracturing and brecciation predating deposition of enargite, luzonite and tennantite at Ain el Bey, and famatinite and tetrahedrite at Chouichia, from As-Sb-Bi-bearing oreforming fluids; tennantite-tetrahedrite series exhibit iron and copper-excess replacements in tetrahedral sites interrelated with Cu-Fe interactions (electron transfer). In Stage 4 fracturing was followed by calcite formation in voids. Comprehensive data was obtained from scanning electron microprobe (SEM) and microprobe chemical analyses of minerals, geothermometry using sulfur isotopes, As contents in arsenopyrite crystals and fluid inclusions in siderite and calcite, support an input of magmatic hydrothermal ore-forming fluids, although contamination by sedimentary sulfur were also identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204026
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  • 3
    Electronic Resource
    Electronic Resource
    Dosage rapide du magnésium dans les ilménites par microréflectométrie (1971)
    Springer
    Mineralium deposita 6 (1971), S. 34-40 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé Une méthode rapide et un appareil simple sont proposés pour la détermination de la teneur en magnésium d'échantillons microscopiques d'ilménites. Fondée sur la proportionnalité entre la réflectance et le pourcentage de MgO des termes de la série ilménite-geikielite, cette méthode est précise, rapide, peu onéreuse et non destructive. Servie par un appareil très simple, le «magnésiomètre» (Brevet B. R. G. M. numéro 1553 106), utilisable dans un laboratoire de terrain, elle peut être pratiquée par un personnel non spécialisé. Cet appareil trouvera des applications dans la détection des ilménites provenant de kimberlites, et de manière plus générale, dans tout autre domaine où la variation de composition chimique d'un matériau entraîne une variation proportionnelle des propriétés optiques, tel qu'en pétrologie, minéralogie, métallogénie et métallurgie.
    Notes: Abstract A rapid method with simple apparatus is proposed for the determination of the magnesium content of microscopic crystals of ilmenite. The method is based upon the proportional relation existing in the series ilménite-geikielite between the percentage of MgO and the reflectance. The method is precise, rapid, trouble-free and non-destructive. A very simple apparatus, the “magnesiometer” (Brevet B. R. G. M. No. 1553 106), can be used in a field laboratory by operators without special training. This apparatus can be used in the detection of ilmenites coming from kimberlites. It also has a very general application to any problem where the variation of the optical properties of a substance is proportional to the variation of its chemical composition, as in petrology, mineralogy, ore mineralogy and metallurgy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00207115
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  • 4
    Electronic Resource
    Electronic Resource
    Sulfide geochemistry and genesis of Chouichia and Ain el Bey copper deposits in northwestern Tunisia (1996)
    Springer
    Mineralium deposita 31 (1996), S. 188-200 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract.  The Chouichia and Ain el Bey copper veins that occur in the Eastern Atlas fold belt in northwestern Tunisia, are hosted in Upper Cretaceous-Paleogene sedimentary sequences in a regional transcurrent shear zone. Paragenetic assemblages were formed during four distinct stages all of which are separated by fracturing and brecciation: Stage 1 consists of low temperature siderite (160–180 °C) formation in association with pyrite, including framboidal pyrite and marcasite. Stage 2 includes pseudomorphing of marcasite by As-rich pyrite and arsenopyrite, and formation of chalcopyrite at higher temperatures (200–300 °C) from S-rich, Fe-Cu-bearing fluids; As contents in individual pyrite and arsenopyrite crystals increase markedly in the rims relative to the centers, thus indicating non-equilibrium conditions. Stage 3 involves fracturing and brecciation predating deposition of enargite, luzonite and tennantite at Ain el Bey, and famatinite and tetrahedrite at Chouichia, from As-Sb-Bi-bearing ore-forming fluids; tennantite-tetrahedrite series exhibit iron and copper-excess replacements in tetrahedral sites inter-related with Cu-Fe interactions (electron transfer). In Stage 4 fracturing was followed by calcite formation in voids. Comprehensive data was obtained from scanning electron microprobe (SEM) and microprobe chemical analyses of minerals, geothermometry using sulfur isotopes, As contents in arsenopyrite crystals and fluid inclusions in siderite and calcite, support an input of magmatic hydrothermal ore-forming fluids, although contamination by sedimentary sulfur were also identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001260050023
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray analysis of Citrobacter amalonaticus methylaspartate ammonia lyase (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 1922-1924 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Methylaspartate ammonia lyase (MAL) catalyses the reversible α,β-elimination of ammonia from L-threo-(2S,3S)-3-methylaspartic acid to give mesaconic acid. Crystals of Citrobacter amalonaticus MAL have been obtained by the hanging-drop method of vapour diffusion using ammonium sulfate as the precipitant. Three crystal forms were obtained from identical crystallization conditions, two of which (forms A and B) diffract to high resolution, whilst the third form diffracted poorly. Crystals of form A diffract to beyond 2.1 Å and have been characterized as belonging to one of the enantiomorphic space groups P4122 or P4322, with unit-cell parameters a = b = 66.0, c = 233.1 Å, α = β = γ = 90° and a monomer in the asymmetric unit. Crystals of form B diffract to beyond 1.5 Å and belong to space group C222, with unit-cell parameters a = 128.3, b = 237.4, c = 65.8 Å, α = β = γ = 90° and a dimer in the asymmetric unit. Determination of the structure of MAL will be an important step in resolving current conflicts concerning the enzyme mechanism which differ between one which places MAL as a member of the superfamily of ammonia lyases whose catalytic activity requires a cofactor formed by post-translational modification of the enzyme and another which links MAL to the enolase superfamily.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444901016675
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Fish Density During Transportation on Stress and Mortality of Juvenile Tambaqui Colossoma macropomum (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the World Aquaculture Society 34 (2003), S. 0 
    Details
    ISSN: 1749-7345
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The increased demand for juvenile tambaqui Colossoma macropomum for grow-out ponds and stocking programs in the Amazon state of Brazil has increased the transportation of this species. This study was designed to determine the optimum density of juvenile tambaqui during transportation in closed containers. Fish (51.9 ± 3.3 g and 14.9 ± 0.4 cm) were packed in sealed plastic bags and transported for 10 h at four densities: 78, 156, 234, and 312 kg/m3. After transportation, fish from each density were kept in separate 500-L tanks for 96 h. Mortality, 96-h cumulative mortality, water quality, and blood parameters (hematocrit, plasma cortisol, and glucose) were monitored. Fish mortality after transportation was significantly lower at densities of 78 and 156 kg/m3 than at 234 and 312 kg/m3. Cumulative mortality was significantly lower at a density of 78 kg/m3. Dissolved oxygen after 10 h of transportation remained high at a density of 78 kg/m3, but reached critically low values at all other densities. Ammonia concentration was highest at the lowest density and was lower at higher densities. Carbon dioxide concentration was lowest at the density of 78 kg/m3 but higher in the other treatments. Plasma glucose and cortisol increased significantly immediately after transportation at densities of 156, 234, and 312 kg/m3, returning to control values by 24 h. The best density for juvenile tambaqui during a 10-h transportation haul in a closed container was 78 kg/m3. At this density there was no fish mortality, water quality was kept within acceptable values, and fish were not stressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-7345.2003.tb00041.x
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  • 7
    Electronic Resource
    Electronic Resource
    Efficacy of Benzocaine as an Anesthetic in Juvenile Tambaqui Colossoma macropomum (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the World Aquaculture Society 32 (2001), S. 0 
    Details
    ISSN: 1749-7345
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract.— The present study investigated the use of benzocaine as an anesthetic for juvenile Colossoma macropomum (tambaqui). In the first experiment, fish were exposed to various doses of benzocaine for 10 min at 24 C. The second experiment examined the effects of duration of exposure to 100 mg/L of benzocaine. In the third experiment, fish were exposed to 100 mg/L at temperatures of 24, 27, and 30 C. Benzocaine concentrations of 100–150 mg/L were considered ideal for quickly inducing total immobilization and fast recovery. Fish exposed to 350 mg/L benzocaine exhibited 30% mortality. No changes in hemat-ocrit were recorded in fish exposed to different concentrations of benzocaine. Plasma glucose increased significantly when fish were exposed to benzocaine concentrations greater than 200 mg/L. Recovery time after a 30-min exposure to 100 mg/L benzocaine was significantly greater than after an exposure for 10 and 20 min. No mortality was observed 96 h after exposure to 100 mg/L benzocaine for 10, 20, and 30 min. Dosages in the 100–150 mg/L range were effective for periods of up to 20 min of anesthesia. There was no effect of temperature on the time required for fish to lose equilibrium. However, recovery was significantly faster for fish anesthetized at 30 C. Benzocaine is an effective anesthetic agent for tambaqui juveniles, providing rapid immobilization and rapid recovery. Benzocaine is also less expensive than other available anesthetic compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-7345.2001.tb00470.x
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  • 8
    Electronic Resource
    Electronic Resource
    Polarized ion sources for high-energy accelerators (invited) : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 732-736 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Motivated by experimental requirements at high energy accelerators, very large increases in polarized H− ion source current have been achieved recently. Polarized H− current of 1 mA dc from the optically pumped source (OPPIS) and 1 mA pulsed H− current from the atomic beam source (ABS) have been demonstrated. High current development of both the ABS and OPPIS is continuing. Pulsed current of more than 10 mA has been proven to be feasible from the OPPIS. An OPPIS is also used in the high precision parity violation experiment at TRIUMF, in which helicity-correlated changes to beam properties must be extremely small. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148609
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  • 9
    Electronic Resource
    Electronic Resource
    A direct current polarized H− ion source based on optically pumped rubidium : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2625-2627 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The TRIUMF optically pumped polarized H− ion source has been modified to operate with rubidium as the optically pumped medium. The intrinsic characteristics of rubidium as well as an increase in laser power, compared with the previous system based on sodium, have led to a large increase in beam polarization to over 75%. A proton current of 2.5 μA extracted from the TRIUMF cyclotron at 230 MeV was easily attained during initial operations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142859
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  • 10
    Electronic Resource
    Electronic Resource
    The TRIUMF optically pumped polarized H− ion source : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1291-1292 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The TRIUMF dc optically pumped polarized H− ion source (OPPIS) produces a 200 μA dc H− current at 85% polarization within a normalized emittance (90%) of 0.8 π mm mrad, for operation at the TRIUMF cyclotron. As a result of development of the electron cyclotron resonance primary proton source, a 1.6 mA dc polarized H− current is produced within a normalized emittance of 2 π mm mrad, suitable for high energy accelerators. The OPPIS has also been developed for use in a parity nonconservation experiment which has very severe limits on permissible helicity- correlated changes in beam current and energy. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146699
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