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  • 1
    Electronic Resource
    Electronic Resource
    Gibt es Sekretionserscheinungen an den Epithelien der Harnkanälchen? (1933)
    Springer
    Journal of molecular medicine 12 (1933), S. 662-663 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01786373
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  • 2
    Electronic Resource
    Electronic Resource
    Efficient size-selective bacterivory by phagotrophic nanoflagellates in aquatic ecosystems (1996)
    Springer
    Marine biology 126 (1996), S. 785-789 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Size-selective grazing on bacterioplankton by phagotrophic nanoflagellates was analyzed and modelled. The proposed model resembles a Monod equation (Michaelis-Menten-like expression) in which clearance rates by heterotrophic nanoflagellates depend on bacterioplnnkton biovolume. Larger bacteria were ingested faster than smaller bacteria. The proposed model was in agreement with experimental data from different authors, both from cultures and natural assemblages. Size-selective grazing efficiency was analyzed as the ability of phagotrophic nanoflagellates to discriminate between cells differing in volume by a factor of two, e.g., corresponding to dividing and nondividing bacteria. Unlike previously published models, the proposed model suggests that phagotrophic nanoflagellates could be highly effective size-selective grazers for small bacteria (〈0.1 μm3), which are the most common bacterial sizes in planktonic systems. However, phagotrophic nanoflagellates were unable to size-discriminate dividing and nondividing bacteria for volumes 〉0.1 μm3. These results strongly support the hypothesis that heterotrophic nanoflagellate grazing, by discriminating between different sizes of dividing and nondividing bacteria, may actually be regulating bacterial size and growth rate in natural aquatic ecosystems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351345
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  • 3
    Electronic Resource
    Electronic Resource
    Urinary excretion of N-acetyl-β-glucosaminidase in slight arterial hypertension during pregnancy (1994)
    Springer
    Journal of molecular medicine 72 (1994), S. 799-799 
    Details
    ISSN: 1432-1440
    Keywords: Arterial hypertension ; Preeclampsia ; N-Acetyl-β-glucosaminidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180550
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  • 4
    Electronic Resource
    Electronic Resource
    Culturability and survival of an extreme thermophile isolated from deep-sea hydrothermal vents (1996)
    Springer
    Archives of microbiology 166 (1996), S. 64-67 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsThermococcus peptonophilus ; Deep-sea ; Hydrothermal vents ; Survival ; Extreme thermophiles ; Culturability ; Active cells ; Mortality ; Dead cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The culturability of a strictly anaerobic, extremely thermophilic archaeon, Thermococcus peptonophilus (optimal growth temperature: 85° C), was studied during survival stages at various temperatures (98, 85, 70, and 4° C). Total cell number (determined by DAPI staining), active cells (rhodamine-stained cells), and culturable cells (using most-probable-number) were counted over time. The number of culturable cells decreased under each condition tested. The total number of cells significantly decreased only at temperatures close to the maximum for growth (98° C); at this temperature, the cells spontaneously lysed. Our results suggested that survival at 4° C in oxygenated waters might be a mechanism for the dispersion of extreme thermophiles in the ocean. In addition, we proved the existence of T. peptonophilus cells in several physiological states: culturable cells, active non-culturable cells, inactive non-culturable cells, and dead cells. Cell death was caused by cellular lysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050356
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  • 5
    Electronic Resource
    Electronic Resource
    Pressure and temperature effects on growth and viability of the hyperthermophilic archaeon Thermococcus peptonophilus (1997)
    Springer
    Archives of microbiology 168 (1997), S. 1-7 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsThermococcus peptonophilus ; Extreme thermophiles ; Large-scale cultivation ; Hydrostatic ; pressure ; Barophiles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied the effects of high temperatures and elevated hydrostatic pressures on the physiological behavior and viability of the extremely thermophilic deep-sea archaeon Thermococcus peptonophilus. Maximal growth rates were observed at 30 and 45 MPa although no significant increases in cell yields were detected. Growth at 60 MPa was slower. The optimal growth temperature shifted from 85° C at 30 MPa to 90–95° C at 45 MPa. Cell viability during the stationary phase was also enhanced under high pressure. A trend towards barophily at pressures greater than those encountered in situ at the sea floor was demonstrated at increasing growth temperatures. The viability of cells during starvation, at high temperature (90, 95° C), and at low temperature (10° C) was enhanced at 30 and 45 MPa as compared to atmospheric pressure. These results show that the extremely thermophilic archaeon T. peptonophilus is a barophile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050462
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  • 6
    Electronic Resource
    Electronic Resource
    Changes in serum and cerebrospinal fluid enzyme activity after head injury (1976)
    Springer
    Acta neurochirurgica 35 (1976), S. 3-13 
    Details
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We studied simultaneously in serum (S) and CSF (L) the enzyme activities of GOT, GPT, LDH, ICDH, MDH, ALD, and CPK in 28 patients with head injuries divided into three groups according to the severity of the trauma. We found a correlation between severity of brain lesion and enzyme activity. The best correlation was found for SGOT, SCPK, LGOT, LLDH, LMDH and LCPK. We do not believe that enzyme activity is of prognostic value. We think that further studies should be made of the specific isoenzymes of the Central Nervous System.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01405928
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic viscosity and microstructure: Particle size dependence of the activation volume : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5955-5957 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ba hexaferrite samples having average particle sizes in the range from the tens up to the thousands of nm have been prepared by using conventional ceramic techniques and the exothermic reaction between Ba and Fe nitrates and oxalic dihydrized acid. The magnetic characterization of these samples included the measurement of the temperature dependence of the high field magnetization, the coercive force, and the evaluation, from thermally activated demagnetization measurements, of the activation volume at different temperatures. From the results of this characterization it was possible to reach conclusions about the occurrence of remarkable differences between the average particle size dependence of the coercive force and that corresponding to the activation volume: whereas the coercive force value increased monotonically with the decrease of the particle size, an activation volume minimum was observed for particle diameters of the order of hundreds of nm. We suggest that this minimum reflects a change of the mechanism ruling the magnetization reversal of the particles forming our samples. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362118
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  • 8
    Electronic Resource
    Electronic Resource
    Coercivity and remanence of amorphous and nanocrystalline Fe–(Cu,Ta)–SiB ribbons : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5465-5467 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the evolution, with the thermal treatment parameters, of the remanence and coercive force of amorphous melt spun ribbons having compositions of Fe77.5Si13.5B9, Fe76.5Cu1Si13.5B9, and Fe74.5Ta3Si13.5B9. The thermal treatments were carried out by using the current annealing technique with and without the simultaneous application of a tensile stress along the axis of the samples. Our results show that upon low temperature (low current), short time treatments both the remanence and the coercive force are basically determined by the characteristics of the effective anisotropy induced during the treatment. In contrast, high temperature (high current) treatments result in values of both quantities that are linked to the (partial or total) accomplishment of the first stage of the crystallization process of the samples. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362274
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  • 9
    Electronic Resource
    Electronic Resource
    Mechanically ground Fe73.5Cu1Nb3Si13.5B9: A soft magnetic material in powdered form : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5479-5481 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the preparation, by high energy ball milling and starting from an amorphous melt–spun material, of powdered samples exhibiting, after suitable thermal treatments, saturation coercive forces of the order of a few tens of mOe. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362281
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  • 10
    Electronic Resource
    Electronic Resource
    Modeling the influence of intergranular phases on the hysteretic behavior of hard magnetic polycrystals : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6943-6945 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have modeled, in the framework of a micromagnetic approximation, the field evolution of the configuration of magnetic moments induced by the occurrence of interfacial exchange coupling at grain boundary regions. The models describe hard ferromagnetic polycrystals where secondary intergranular phases are present. Depending on the paramagnetic or soft ferromagnetic nature of the secondary phases, on the exchange to anisotropy ratio of the main phase and on the intensity of the exchange coupling at the interfaces the reversal, from a remanence state, of the magnetization of a linear chain of magnetic moments perpendicular to the interface takes place for demagnetizing fields which vary from the anisotropy field of the hard phase (grains decoupled by a thick paramagnetic layer) down to tenths of that field (coupling through a soft layer). The dependence of these phenomena on the thickness of the intergranular phases has been also examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352442
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