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  • 1
    Digitale Medien
    Digitale Medien
    Effects of spacer layers on the Wigner function simulation of resonant tunneling diodes (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 8057-8061 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effects of spacer layer width and asymmetry on the simulation of quantum transport in resonant tunneling diodes are studied. The results show that these layers significantly influence the I–V characteristic, which presents important differences under direct or reverse bias polarity in devices with asymmetric spacer layers. These differences are interpreted in terms of potential profile comparisons of the simulated structures and are in qualitative agreement with experimental data. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.367899
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  • 2
    Digitale Medien
    Digitale Medien
    Bohm trajectories for the Monte Carlo simulation of quantum-based devices (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 806-808 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A generalization of the classical ensemble Monte Carlo (MC) device simulation technique is proposed to simultaneously deal with quantum-mechanical phase-coherence effects and scattering interactions in quantum-based devices. The proposed method restricts the quantum treatment of transport to the regions of the device where the potential profile significantly changes in distances of the order of the de Broglie wavelength of the carriers (the quantum window). Bohm trajectories associated to time-dependent Gaussian wave packets are used to simulate the electron transport in the quantum window. Outside this window, the classical ensemble MC simulation technique is used. Classical and quantum trajectories are smoothly matched at the boundaries of the quantum window according to a criterium of total-energy conservation. A self-consistent one-dimensional simulator for resonant tunneling diodes has been developed to demonstrate the feasibility of our proposal. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.120899
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  • 3
    Digitale Medien
    Digitale Medien
    Comparative study between European and American species of Polistes using sera from European sensitized subjects (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 25 (1995), S. 0 
    Details
    ISSN: 1365-2222
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Although the different vespid species of the genus Polistes are found all over the world, studies about allergy sensitization to these species have been made mainly in North America. We studied the specific IgE in a large group of sera from patients sensitized to Polistes dominulus (PD) and determined the crossreactivity with another important European Polistes (P. gallicus [PG]) and with five American relevant species of this genus: P. exclamans (PE), P. fuscalus (PF), P. metricus (PM), P. annularis (PAN) and P. apachus (PAP). Studies indicated that 96.7% of sera with IgE positive to PD were positive to PG. No case positive to just PG was found. The comparison of these two European species with the American relatives indicated that most cases were positive to all the insects although there were significant differences in the radioallergosorbent test (RAST) value. These results were confirmed by RAST inhibition studies, and indicate that although the European and American species are closely related, species specific allergenic differences exist. These data suggest that in vivo studies should be carried out in order to determine the sensitivity and specificity of the European venoms compared with the American species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2222.1995.tb01041.x
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  • 4
    Digitale Medien
    Digitale Medien
    Pollinosis due to Australian pine (Casuarina): an aerobiologic and clinical study in southern Spain (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 52 (1997), S. 0 
    Details
    ISSN: 1398-9995
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: An aerobiologic and clinical survey was conducted in Málaga, southern Spain, in order to determine fluctuations of Australian pine (Casuarina) pollen in the atmosphere of the city, and the prevalence of sensitivity in a nonatopic population. The aerobiologic survey, using a Burkard spore trap, was conducted from January 1991 to December 1994, and sensitization was ascertained by the skin prick test. The pollen season is relatively short and the pollen dispersion period occurs during October and November, mainly during the last 3 weeks of October. Diurnal patterns showed that the highest concentrations of pollen occur between 12 a.m. and 2 p.m., the most influential variables in its dispersion being temperature, sunshine, and rainfall. The prevalence of sensitization to Casuarina pollen was determined by skin prick test (SPT) in a nonatopic population of 210 patients with a previous history of autumn rhinitis, asthma, or rhinitis asthma. Six subjects showed a positive reaction to the pollen extracts, and the presence of specific IgE was demonstrated by the conventional radioallergosorbent test (RAST 〈inlineGraphic alt="geqslant R: gt-or-equal, slanted" extraInfo="nonStandardEntity" href="urn:x-wiley:01054538:ALL11:ges" location="ges.gif"/〉2) in five of these patients with positive SPT.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1398-9995.1997.tb02540.x
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  • 5
    Digitale Medien
    Digitale Medien
    Bone Mineral Density and Androgen Levels in Elderly Males (1999)
    Springer
    Calcified tissue international 65 (1999), S. 417-421 
    Details
    ISSN: 1432-0827
    Schlagwort(e): Key words: Free testosterone — Androgens — Bone mineral density — Osteoporosis.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Abstract. To clarify the relationship of sex male hormones and bone in men, we studied in 140 healthy elderly men (aged 55–90 years) the relation between serum levels of androgens and related sex hormones, bone mineral density (BMD) at different sites, and other parameters related to bone metabolism. Our results show a slight decrease of serum-free testosterone with age, with an increase of follicle stimulating hormone (FSH) and luteinizing hormone (LH) in a third of the elderly subjects studied. BMD decreased significantly with age in all regions studied, except in the lumbar spine. We found a positive correlation between body mass index (BMI) and BMD at the lumbar spine and femoral neck (P 〈 0.001). No relationship was found (uni- and multivariate regression analysis) between serum androgens or sex hormone-binding globulin (SHBG) and BMD. We found a positive correlation of vitamin D binding protein (DBP) and osteocalcin with lumbar spine BMD and with BMI, DBP, IGF-1, and PTH with femoral neck BMD. In conclusion, there is a slight decline in free testosterone and BMD in the healthy elderly males. However, sex male hormones are not correlated to the decrease in hip BMD. Other age-related factors must be associated with bone loss in elderly males.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002239900726
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  • 6
    Digitale Medien
    Digitale Medien
    Organochlorine Pesticide Residues in Rainbow Trout, Oncorhynchus mykiss, Taken from Four Fish Farms in León, Spain (1997)
    Springer
    Bulletin of environmental contamination and toxicology 58 (1997), S. 779 -786 
    Details
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001289900402
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  • 7
    Digitale Medien
    Digitale Medien
    Role of Pinoline and Melatonin in Stabilizing Hepatic Microsomal Membranes against Oxidative Stress (1999)
    Springer
    Journal of bioenergetics and biomembranes 31 (1999), S. 609-616 
    Details
    ISSN: 1573-6881
    Schlagwort(e): Pinoline ; melatonin ; lipid peroxidation ; membrane fluidity ; microsome
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Physik
    Notizen: Abstract We investigated the influence of pinoline (0.01–1.5 mM) on microsomal membrane fluiditybefore and after rigidity was induced by oxidative stress. In addition, we tested the effect ofpinoline in the presence of 1 mM melatonin. The fluidity in rat hepatic microsomes wasmonitored using fluorescence spectroscopy and it was compared to the inhibition ofmalonaldehyde (MDA) plus 4-hydroxyalkenals (4-HDA) production as a reflection of lipid peroxidation.Below 0.6 mM, pinoline inhibited membrane rigidity in a manner parallel to its inhibitoryeffect on MDA + 4−HDA formation. At concentrations between 1–1.5 mM, pinoline wasless effective in stabilizing microsomal membranes than was predicted from its inhibition oflipid peroxidation. The addition of 1 mM melatonin enhanced the membrane-stabilizing activityof pinoline (0.01–0.6 mM). This cooperative effect was not observed for concentrations ofpinoline between 1–1.5 mM. When pinoline was tested without induced oxidative damage,1–1.5 mM pinoline maintained membrane fluidity at the same level as that recorded afterinduced lipid peroxidation. The results suggest that pinoline may be another pineal moleculethat prevents membrane rigidity mediated by lipid peroxidation and this ability is enhancedby melatonin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1005425213253
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  • 8
    Digitale Medien
    Digitale Medien
    Gamma radiation and radon levels in Mexico City dwellings (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 193 (1995), S. 259-268 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract Gamma exposure rate and radon levels were measured in 75 single-family dwellings in Mexico City in order to correlate them with local environment. Radon monitoring was performed both indoors and outdoors using a continuous working level monitor for short-lived radon decay products; the gamma exposure rate was measured using CaSO4: Dy+PTFE. The results obtained show a log-normal distribution. The mean indoor radon concentration is lower than 45 Bq/m3 and the mean indoor gamma exposure rate was 11.29 μR/h.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02039883
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