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  • 1
    Electronic Resource
    Electronic Resource
    Effect of cations, pH and sulfate content on the viscosity and emulsifying activity of the Halomonas eurihalina exopolysaccharide (1998)
    Springer
    Journal of industrial microbiology and biotechnology 20 (1998), S. 205-209 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: exopolysaccharide; rheology; emulsifier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effects of monovalent and divalent cations on the rheological behavior of Halomonas eurihalina exopolysaccharide (EPS) were studied. Sodium, potassium, magnesium and calcium were added and the relative abilities to increase viscosity were as follows: KCl 〉 NaCl 〉 MgCl2 〉 CaCl2. The highest viscosity value was measured in acidic 10−4 M KCl, in which a gel formed. A loss of sulfate content seemed to correlate with the increase of viscosity. H. eurihalina produced EPS in all growth media. Addition of hydrophobic substrates to culture media produced changes in chemical composition and emulsifying activity of the EPS. Xylene was the most effectively emulsified substance and the EPS produced on tetradecane and on corn oil the most active emulsifier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900513
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal resistance between powdered cerium magnesium nitrate and liquid helium at very low temperatures (1971)
    Springer
    Journal of low temperature physics 4 (1971), S. 391-400 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experiments have been performed from magnetic temperatures of 2–20 mK on the effect of minute4He impurities and a magnetic field on the thermal resistance between powdered cerium magnesium nitrate (CMN) and liquid3He. The thermal resistance decreases with decreasingT and increasing small field but is increased dramatically at a givenT by the addition of roughly a monolayer of4He. The resistance is interpreted as resulting from a surface magnetic coupling between CMN and liquid3He.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628739
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal resistance between a paramagnetic salt (CMN) and liquid helium at millikelvin temperatures (1984)
    Springer
    Journal of low temperature physics 55 (1984), S. 439-454 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report new measurements of the thermal resistance between cerium magnesium nitrate (CMN) and liquid helium. AtT=100 mK, the thermal resistanceR for powdered CMN in contact with liquid3He-4He or liquid3He is about 2000 times the Kapitza boundary resistance. From the field and temperature dependences ofR we conclude that it is dominated by the phonon-bottlenecked spin-lattice resistance. However, if high-purity liquid3He is in contact with CMN, we observe, below 20 mK, a magnetic boundary resistance in parallel to the spin-lattice resistance. This resistance is two orders of magnitude smaller than the spin-lattice resistance atT=10 mK, and is described byR ∝ T 1.4. The absolute values of the magnetic boundary resistance, as well as the spatially limited phonon-bottlenecked resistance, are extremely sensitive to the surface treatment of the CMN crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681774
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal contact between cerium magnesium nitrate and liquid3He at very low temperatures (1973)
    Springer
    Journal of low temperature physics 10 (1973), S. 379-395 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new experimental arrangement has been used to measure the times for equilibrium between cerium magnesium nitrate (CMN) and liquid3He. Measurements have been made on a single crystal of CMN from temperatures of 5.5–15 mK and on a powdered specimen from temperatures of 2.5–35 mK. The thermal resistance deduced from the single-crystal data is proportional toT −2. The thermal resistance obtained from the powder data may be separated into three contributions: a resistance which is proportional toT −2in series with a parallel combination of a phonon resistance (with resistivity ρ P =3×10 −4 T −3sec·cm2·K 4 ·erg −1 ) and a magnetic resistance (with resistivity ρ M =9×10 2 T sec·cm 2 ·erg −1 in zero applied magnetic field). A reduction in the magnetic resistance was observed when the powdered CMN was placed in a magnetic field, the magnitude of this reduction being comparable to that expected from a Redfield-like theory. TheT −2resistance is discussed in terms of two-dimensional energy transport within the CMN. The 17-Hz susceptibility of the powdered CMN was measured in magnetic fields of 0, 18.9, 30.2, and 37.8 G. The magnetic temperatureT* (H=37.8 G) was found to differ by +0.5 mK from the magnetic temperature in zero field whenT* (H=0)=3 mK.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654916
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic heat conductance between CMN single crystals and liquid3He (1986)
    Springer
    Journal of low temperature physics 63 (1986), S. 401-421 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the magnetic Kapitza resistance between single crystals of CMN and lanthanum-diluted CMN in contact with ultrapure liquid3He are presented. The investigations were performed in the temperature range 2–100 mK and in magnetic fields up to 600 Oe. For the first time, a magnetic thermal coupling between bulk crystals with dimensions of up to 3 mm and liquid3He was observed. In the case of pure CMN and liquid3He below 7 mK, the relationR ∞ T n withn=4±1 is seen. A strong dependence ofR with magnetic field and Ce3+ content is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681489
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic field effects in thick proximity-induced superconductors (1987)
    Springer
    Journal of low temperature physics 66 (1987), S. 41-54 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Low-field magnetic screening and breakdown fields have been measured in thick proximity-induced superconducting copper by means of dc magnetization and ac susceptibility in the temperature range 10 to 0.005 K. From the thickness and temperature dependence of the breakdown field the Cooper pair penetration depth in copper is obtained. This value isK N −1 =0.6/T μm, withT in kelvins. No saturation effects were observed in the screening length ρ, the breakdown fieldH b, or the supercooled fieldH sc down to the lowest temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681466
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic properties of proximity-induced superconducting copper and silver (1989)
    Springer
    Journal of low temperature physics 76 (1989), S. 465-512 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic properties of micrometer thick, proximity-induced superconductors have been investigated in the temperature range 5×10−4 T CNS 〈T〈T CNS . HereT CNS is the transition temperature of the NS proximity system. By means of ac susceptibility measurements and dc magnetization curves in copper and silver, we have determined the breakdown fieldH b , the supercooled fieldH sc and the superheated fieldH sh , as functions of temperature and normal metal thicknessd N . Precise magnetization curves of specimens withd N 〈15 µm at the lowest temperatures gave the screening length ρ as function of the field H. From these data, the spatial dependence of the local critical fieldH c (x) and of the induced order parameterΔ N (x) in theN side were derived in the caseΔ N (x)〉k B T and x≪K N −1 . HereK N −1 is the Cooper pair penetration length, andx the distance form the SN interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681740
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  • 8
    Electronic Resource
    Electronic Resource
    Quantum tunneling of vortices in cuprate and heavy fermion superconductors (1994)
    Springer
    Journal of low temperature physics 95 (1994), S. 377-381 
    Details
    ISSN: 1573-7357
    Keywords: 74.60 Ge ; 74.25 Bt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In high-Tc and in heavy fermion superconductors at low enough temperatures, pinned vortices move from one potential well to another mainly by quantum tunneling. In the superconducting cuprates, the measured creep rates at low magnetic induction and in the T → 0 limit are in excellent agreement with the values calculated within the framework of the Quantum Collective Creep theory. In the heavy fermion superconductor UPt3, the measured rates at T → 0 are much higher than the theoretical values, giving evidence that the low temperature motion of vortices in this material is possibly related to its unconventional character.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00754953
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  • 9
    Electronic Resource
    Electronic Resource
    Flux dynamics and low-field magnetic properties of the heavy-fermion superconductor CeCu2Si2 (1993)
    Springer
    Journal of low temperature physics 90 (1993), S. 15-53 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Strong flux creep effects are observed in CeCu2Si2 at low magnetic inductions and temperatures in the range 6 mK〈T〈T c . Measurements of flux creep in single crystal as well as polycrystalline specimens show that the magnetization in CeCu 2 Si 2 decays following a power law time dependence of the typeM(t)∝t −α for 1〈t〈10 5 sec, where the exponent a ranges between 0.015 and 0.06. The activation energy values obtained from the relaxation rates are around 2–3 meV. The flux creep data give clear evidence of the existence of different types of pinning centers in CeCu 2 Si 2 : a large number of shallow potential barriers that characterize the vortex dynamics at short times and few strong pinning centers responsible for the long-time relaxation behavior. Quantum tunneling of flux lines through weak pinning centers probably gives rise to the non-thermally activated relaxation observed at the lowest temperatures. The physical origin of weak and strong pinning centers in CeCu 2 Si 2 is discussed. From isothermal dc magnetization measurements we estimate the lower critical fieldH c1 as well as the critical current densityJ c . TheH c1 versusT curve shows an anomalous positive curvature for temperatures close toT c .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682009
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  • 10
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    Cambio de Fase Coral-algas en el Arrecife de Coral de Mahahual, en el Caribe Mexicano (2021)
    In:  http://aquaticcommons.org/id/eprint/21312 | 9596 | 2020-08-21 23:33:22 | 21312 | Gulf and Caribbean Fisheries Institute
    Details
    Publication Date: 2021-07-14
    Keywords: Fisheries ; GCFI
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 28-31
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