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  • 1
    Electronic Resource
    Electronic Resource
    Controlling the Composition of Nanosize Hexagonal WO〈sub〉3〈/sub〉 for Gas Sensing (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 589 (June 2008), p. 161-166 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Hexagonal (h-) WO3 was prepared through heating hexagonal ammonium tungstenbronze (HATB), (NH4)0.07(NH3)0.04(H2O)0.09WO2.95. By adjusting the heating temperature andatmosphere of HATB, we could control the oxidation state of tungsten atoms and the residualNH3/NH4+ content in h-WO3. The as-produced h-WO3 nanoparticles with different compositionwere tested as gas sensors and the effect of composition on gas sensing properties was studied. Ourresults showed that oxidized h-WO3 had the best sensitivity to H2S
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.589.161.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Following the Artificially Induced Eel Maturation Process by Means of In Vivo CT Scanning (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the World Aquaculture Society 35 (2004), S. 0 
    Details
    ISSN: 1749-7345
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Artificially induced maturation of 10 male eels Anguilla anguilla L. weighing 170 ± 30-3 g was followed for 6 wk with in vivo CT scanning in a repeated manner. Since testis tissue has a well defined X-ray density value, the volumetric development could be described. Parallel with this process, a strong decrease of the abdominal fat volume was measured and depicted with the applied surface smoothing method. As an affect of the hCG treatment (250 IU/week per eel) at the third wk, the testis could clearly be recognized on the images. From that time the average testis volume values of the 10 eels were 4,975, 6345, 11,583 and 14,553 mmJ respectively. At the sixth wk, the relative testis volume in the abdomen was 25%. In the fillet a characteristic shift (from -10 to -20 Hounsfield units) of the density histogram towards the fat interval was detected. The average density value of the fillet was found to be zero; this was supported furthermore by the histological analysis of the fillet (fat to muscle rate 0.35-0.40). On the basis of the above findings, the applied CT scanning method was proven to be suitable to follow in vivo the maturation process of male eels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-7345.2004.tb01077.x
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  • 3
    Electronic Resource
    Electronic Resource
    Isotope effect in electron stimulated desorption: The role of internal degrees of freedom in CO desorption from Pt(111) (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 563-572 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron stimulated desorption (ESD) of CO+, O+, metastable neutral CO*, and ground state neutral CO from the CO/Pt(111) was studied, using isotopic substitution of CO. Four isotopic versions of CO were compared in their desorption behavior. Contrary to the prediction of theoretical models that suggest a decrease of the ESD yield with increasing mass of a given desorption product, the CO+ and CO* ESD yields were found to be larger from the (heavier) 12C18O than from the (lighter) 13C16O adsorbate. The O+ ESD yields followed the expected trend Y(16O+)(approximately-greater-than)Y(18O+). No isotope effect was observed for ground state neutral CO desorption. Qualitative arguments explaining the anomalous isotope effect, and emphasizing the importance of internal dynamics, in particular, the rotation of diatomic desorption products in the ESD process, are presented. Here it is shown that the velocity of departure of the carbon end of the rotating CO molecule may control neutralization or quenching effects for CO+ or CO* produced by electron stimulated desorption. Thus, neutralization or quenching of the excited CO species occurs via carbon-centered orbitals of the departing species. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469436
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  • 4
    Electronic Resource
    Electronic Resource
    Extrusion reactions in an rf plasma. Production of benzocycloalkenes (1979)
    s.l. : American Chemical Society
    The @journal of organic chemistry 44 (1979), S. 4504-4508 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00393a009
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal and direct etching mechanisms of Si(100) with a hyperthermal chlorine beam (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 3623-3626 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The etching of Si(100) with hyperthermal beams of atomic and molecular chlorine has been studied in the temperature range between 130 and 200 K. The dominant etch product, SiCl4, is evolved in two parallel reaction pathways, only one of which is thermally activated. It is shown that the nonactivated pathway, which has an appreciable rate only when hyperthermal chlorine atoms are incident upon the surface, is due to collision-induced desorption of weakly bound SiCl4. By increasing the normal component of the chlorine incident translational energy, the efficiency of converting incident Cl into SiCl4 can be increased to 0.6% in the nonthermal channel, at temperatures for which the thermal etching rate is negligible. The normal energy scaling and the observed energy threshold suggest that this process should result in highly anisotropic etching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356074
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  • 6
    Electronic Resource
    Electronic Resource
    Up-regulation of cerebral carbonic anhydrase by anoxic stress in piglets (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 85 (2003), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The resuscitation of asphyxiated babies is associated with changes in cerebral protein synthesis that can influence the neurological outcome. Insufficient gas exchange results in rapid shifts in extracellular and intracellular pH. Carbonic anhydrase (CA) plays an important role in buffering acute changes in pH in the brain. We investigated whether asphyxia/re-ventilation influences the expression of cerebral CA isoforms (CA-II, CA-III and CA-IV) in anaesthetized newborn pigs. The cerebral cortex, hippocampus, cerebellum and retina were sampled, and prepared for either CA immunohistochemistry or CA immunoblotting from piglets subjected to asphyxia (10 min) followed by 2–4 h of re-ventilation, and also from normoxic controls. The CA immunoreactivity (IR) of all the isoforms studied was weak in the controls, apart from staining of a few oligodendrocytes in the subcortical white matter, some astrocytes in the superficial layer of the cerebral cortex, the cerebellar Purkinje cells and the retinal Müller cells that possessed moderate CA-II IR. However, asphyxia induced a marked increase in the CA IR of all isoforms in all the cerebral regions investigated and the retina after 4 h of survival. The pyramidal cells of the frontal cortex and hippocampus displayed the most conspicuous increase in CA IR. Immunoblotting confirmed increased levels of all the CA isoenzymes. We conclude that raised CA levels after asphyxia may contribute to the compensatory mechanisms that protect against the pathological changes in the neonatal CNS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.2003.01721.x
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  • 7
    Electronic Resource
    Electronic Resource
    A Redescription of the Morphology of Onychodromus grandis Stein 1859 and the Systematic Implications of its Morphogenesis (1995)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 42 (1995), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Morphology and morphogenesis of Onychodromus grandis (Hypotrichida, Ciliata) were studied in vivo and in protargolimpregnated preparations. The species was isolated from halophyte communities in astatic shallow waters of the Hortobágy National Park, Hungary. The species has two well developed dorsal horns. According to some characteristics (number and situation of ventral cirri) our findings differ from Stein's description in 1859. Individuals of the population studied had 9 ventral cirri in 3 rows. Nine rows of dorsal kineties were found on the back. It was found that the oral primordium develops in the vicinity of the transverse cirri. In O. grandis marginal primordia are formed in the marginal rows with the participation of parental cirri. This is also true for Laurentiella acuminata. Dorsal fragmentation of O. grandis displays similarity to that of L. acuminata, considering especially the development of the numerous small dorso-marginal kineties. There are certain similarities among O. quadricornutus, O. indica, L. acuminata, Stylonychia vorax and O. grandis in the development of the ventral and dorsal pattern and in some morphogenetical events. The remarkable differences in the interphase cells can be related simply to the significantly different numbers of cortical units (number of cirri). and also to the various cell sizes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1995.tb01539.x
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  • 8
    Electronic Resource
    Electronic Resource
    Cyano transfer from acetonitrile to aromatic compounds (1979)
    s.l. : American Chemical Society
    The @journal of organic chemistry 44 (1979), S. 1670-1674 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01324a019
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  • 9
    Electronic Resource
    Electronic Resource
    Oxidation of CO by oxygen on a stepped platinum surface: Identification of the reaction site (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6191-6202 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The coadsorption of oxygen and carbon monoxide on the stepped Pt(112) surface has been studied using electron stimulated desorption–ion angular distribution (ESDIAD), temperature programmed desorption (TPD), and low energy electron diffraction (LEED). It has been possible to preferentially adsorb different isotopic CO molecules on step and terrace sites, respectively, following oxygen adsorption on step sites to partial coverage. Transient kinetic experiments show that below ∼200 K, isotopic CO present exclusively on terrace sites is more effectively involved in CO2 production, compared to less reactive CO on the step sites. Above ∼200 K, site exchange between step and terrace CO species prevents the measurement of the relative reactivity of the two kinds of chemisorbed CO. The results show that the elementary step producing CO2 from adsorbed CO and adsorbed oxygen is structure sensitive, even though the overall catalytic reaction between CO and O2 is generally classed as a structure insensitive reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462636
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  • 10
    Electronic Resource
    Electronic Resource
    Width of particle beams desorbed in electron stimulated desorption: O+ and metastable CO from CO/Pt(111) (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 689-699 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The role of adsorbate vibrations parallel to the surface on the width of particle beams escaping from the surface in electron stimulated desorption (ESD) has been studied. Chemisorbed CO on Pt(111) was employed as a model system. The angular distribution of O+ and of the metastable a 3π–CO (CO*) species desorbed in ESD was measured. A cluster calculation was used to model the CO vibration on Pt(111), from which it was possible to calculate the CO* and O+ ESDIAD (electron stimulated desorption-ion angular distribution) beam widths. For CO* we were able to calculate the width of the ESDIAD beams for θCO=0.15 ML with an accuracy better than the error bar of the measurement in the temperature range of 100–300 K. This calculation shows that the CO* angular distribution is related to both the bond direction and the parallel momentum of the surface oscillator at the time of excitation. For θCO=0.5 ML, the width of the measured and calculated values are in good agreement in the temperature range of 100–230 K; above 230 K the experimental results show a positive deviation from the calculated values, indicating that an extra broadening mechanism occurs above ∼230 K, probably because of the onset of an order–disorder transition. For the O+ ESDIAD beam widths the experimental results show a somewhat sharper distribution than the calculated values, most likely because of the angularly anisotropic neutralization rate that was not quantitatively considered in the calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464614
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