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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 22 (1983), S. 4326-4335 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 24 (1985), S. 6370-6374 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 11 (1972), S. 494-502 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Semiconductors 31 (1997), S. 1225-1227 
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The thermoelectric power and optical absorption spectra of single-crystal PbTe, implanted with oxygen and vacuum annealed, have been investigated. A quasilocal level, which could be associated with oxygen, was found in the PbTe:O+ valence band.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Semiconductors 32 (1998), S. 397-400 
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The spectral dependences of the absorption coefficient in undoped p-Pb1−x SnxSe(x=0.00–0.06) at T=300 K were investigated. A quasilocal level associated with a chalcogen vacancy was found in all experimental samples. It is shown that the chalcogen vacancy density in samples with tin is appreciably different from that in samples without tin, and it increases with x. The nature of this phenomenon is discussed.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 25 (1978), S. 169-178 
    ISSN: 1432-0827
    Keywords: Phosphophoryn ; Phosphoproteins ; Dentin ; Mineralization ; Collagen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Freshly excised rat incisors were immediately cleaned and demineralized in 0.5M ethylene diaminetetracetic acid at pH 7.5. The extracts were freed of calcium, diffusible phosphate and low molecular weight polypeptide components by dialysis in membranes with cut-off of 3500 molecular weight. The extract was resolved into at least 7 protein components by chromatography on DEAE-cellulose at pH 8.2. The composition of each protein component was determined. Two proteins, rich in serine, phosphorous and aspartic acid were unlike any proteins attributed to enamel, and hence were considered to be components of incisor dentin. These were the principal noncollagenous components of the teeth. Further purification was carried out under dissociative conditions on Sepharose CL-6B gel filtration columns in 3.0M guanidine hydrochloride. The two phsophoproteins have mol wts, by this method, of 71,000 and 65,000, respectively, and differ in content of apolar amino acids, although both contain 〉70 residue % of seryl (or phosphoseryl) and aspartyl residues. The name “phosphophoryns” is proposed to describe these dentinal proteins. The insoluble collagenous matrix remaining after the original demineralizing extraction was degraded with cyanogen bromide. Several non-collagenous protein components were released as well as the typical collagen derived peptides. Two collagen phosphoprotein complex peptides were also isolated, demonstrating as in bovine dentin, the probable direct covalent interaction of a dentin phosphoprotein with the collagen of the mineralized matrix.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Semiconductors 33 (1999), S. 1072-1075 
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Single-crystal and hot-pressed samples of PbSe: O+ were used to investigate the thermoelectric power and optical reflection spectrum and absorption of this material at 300 K. A quasilocal level associated with oxygen was identified in the valence band of PbSe: O+.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Semiconductors 32 (1998), S. 937-938 
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The spectral dependence of the optical reflection of n-(Pb0.78Sn0.22)1−x InxTe (x=0.02 and 0.03) and p-Pb0.78Sn0.22Te doped with 3 at. % In and 1.5 at. % Tl has been investigated at T=300 K. Minima associated with plasma vibrations of the free carriers were observed in all the experimental spectra. The electron density n and the hole density p were estimated by the Kukharskii-Subashiev method. It is shown that the value of n so obtained is much smaller than its value obtained from the Hall effect only in n-(Pb0.78Sn0.22)0.97In0.03Te in which, as had been assumed previously, hopping conductivity dominates. This result may be viewed as an independent experimental confirmation of the unusual character of conduction in n-(Pb0.78Sn0.22)1−x InxTe solid solutions with high indium content.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The purpose of this investigation was to evaluate the influence of the distance of the needle tip from the apical foramen on the apical seal and the length control of the root filling material when thermoplasticized gutta-percha is injected using a sectional injection technique. Ninety-nine human single-rooted mandibular incisors and permanent premolars with straight canals were divided into three equal Groups A, B and C. In Group A the teeth had relatively the wider root canal, in Group C the narrowest, while in Group B root canal size was intermediate. The root canals of all teeth were prepared with a step-back technique. Roots of Group A were instrumented to a Size 70 4 mm short of the working length, while roots of Groups B and C to a Size 70 6 mm and 8 mm short of the working length, respectively. The teeth of all groups were covered with aluminium foil and embedded in acrylic blocks. After the placement of sealer (Roth 811) the root canals of all teeth were obturated with injection-molded thermoplasticized gutta-percha using a three-stage sectional technique. The roots remained in India ink for three days and then cleared by successive immersion in nitric acid, ascending grades of alchohol and finally in xylene. The linear dye penetration and the linear apical underextension of the root canal filling were measured by two independant examiners under a stereo microscope. There was no significant difference in the linear dye leakage between the groups. However, because of the zero value of linear underextention in Group A, significant difference was found between Group A vs B and A vs C, while no statistically significant difference was found between B and C groups.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 12 (1996), S. 0 
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Root canal sealing ability of obturation techniques has been assessed in vitro with various methods. The majority of the methods employ microleakage tracers and particularly dyes. In vitro measurements of dye penetration are either linear or volumetric. Area-metric analysis is a three dimensional registration method of dye leakage. The purpose of the present study was to evaluate in cleared teeth area-metric analysis as opposed to linear analysis of dye penetration. Forty freshly extracted single rooted human teeth were used. Instrumentation was carried out using Hedstroem files with a step back technique. The root canals were obturated using Roth sealer and gutta-percha cones and lateral condensation technique. The roots were then subjected to dye leakage tests under vacuum of 50mmHg for 20min. India ink was used as the tracer. The roots were randomly divided in two groups. In Group A the roots were cleared and linear measurements of the dye penetration were recorded The roots in Group B were ground stepwise transversally and subjected to area metric analysis. The results showed that area-metric analysis enabled sufficient recordings of the dye leakage patterns and the volume of the dye penetration could also be calculated.
    Type of Medium: Electronic Resource
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