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  • 11
    Electronic Resource
    Electronic Resource
    Spin-down of the X-ray pulsar GX1 +4 during an extended low state (1988)
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 746-748 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] GX1 +4 (4U1728 -24) is a luminous binary X-ray pulsar near the Galactic centre13, with a ~2 min (or possibly twice this) pulse period and probably a 〉 100-day binary period7'13. From its discovery in the early 1970s until 1980, it was spinning up rapidly, with P = -7.5 x 10~8 s s-1 (P/P = -0.02 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/333746a0
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  • 12
    Electronic Resource
    Electronic Resource
    Misreading of DNA templates containing 8-hydroxydeoxyguanosine at the modified base and at adjacent residues (1987)
    [s.l.] : Nature Publishing Group
    Nature 327 (1987), S. 77-79 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Figure 1 shows the nucleotide sequences of two synthetic 8-OH-dG-containing oligodeoxynucleotides (fragments B and D) and their counterparts with normal G in place of 8-OH-dG (fragments A and C) and gives details of their chemical synthesis. Figure 2 shows an example of the base composition and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/327077a0
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  • 13
    Electronic Resource
    Electronic Resource
    High level radioactive nuclides in Japan in May (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 819-820 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-The accidental release of radioactive materials from the Chernobyl nuclear power plant on 26 April 1986 is known to have caused significant pollution in Western Europe at distances as great as 2,000 km. We have been measuring natural and artificial radionuclides in the environment of Japan for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321819a0
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  • 14
    Electronic Resource
    Electronic Resource
    Discovery of an unusual hard X-ray source in the region of supernova 1987A (1987)
    [s.l.] : Nature Publishing Group
    Nature 330 (1987), S. 230-231 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have been regularly observing SN1987A from the X-ray astronomy satellite Ginga1'2 since 25 February 1987, immediately following the optical discovery2'3. Ginga carries a set of proportional counters of 4,000 cm2 effective area and a field of view of 2°x4° full width. SN1987A (hereafter ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/330230a0
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  • 15
    Electronic Resource
    Electronic Resource
    Coordinated optical-EXOSAT-tenma observations of a burst from 2S1636-536 (1985)
    Springer
    Space science reviews 40 (1985), S. 249-253 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract During a coordinated observations of 2S1636-536 with EXOSAT, Tenma and the 1.4 metre Danish telescope at La Silla, a single burst was detected at all three observatories. The burst was bright with a peak flux of 6 × 10-8 ergs/cm 2 /s and rapid expansion of the blackbody radius. EXOSAT and Tenma agree closely in the values of blackbody radius, temperature and flux which are very similar to the three bursts recently reported by Tenma which appear to reach the Eddington flux limit at their peak. Preliminary analysis of the X-ray and optical timing data reveal that this burst is unusual in having a sharp leading edge in both X-ray and optical data and a very short X-ray-optical delay compared with those previously observed. If confirmed, this result puts significant restraints on the location of the optical reprocessing site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212894
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  • 16
    Electronic Resource
    Electronic Resource
    Identification of fetal hemoglobin in blood stains by high performance liquid chromatography (1989)
    Springer
    International journal of legal medicine 102 (1989), S. 437-444 
    Details
    ISSN: 1437-1596
    Keywords: Fetal hemoglobin, identification in blood stains ; Blood stains, identification of fetal hemoglobin ; Fetales Hämoglobin, in Blutspuren ; Blutspuren, Nachweis von fetalem Hämoglobin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Es wurde eine neue Methode zur Identifizierung von fetalem Hämoglobin (Hb F) in Blutspuren mit der umgekehrten Phase-Hochleistungsflüssigkeitschromatographie durchgeführt. Die Unterscheidung zwischen fetalen Blutspuren und denen von Erwachsenen erfolgte aufgrund der Existenz der Spitzen der γ-Ketten von Hb F. In den Chromatogrammen der untersuchten Blutspuren von Erwachsenen traten fast keine γ-Ketten auf. Diese Methode ermöglichte ferner die Bestimmung des Hb F-Wertes mit dem Flächenverhältnis der Globin-Ketten auf den Chromatogrammen. Hb F-Werte der sechs Fälle von Nabelschnurblutspuren auf dem Filterpapier lagen zwischen 81.1% und 91.3%. Die vorliegende Untersuchung zeigt, daß sich der Hb F-Wert für mindestens 12 Wochen nicht ändert. In der Praxis der Rechtsmedizin ist diese Methode im Hinblick auf die Einfachheit, hohe Empfindlichkeit, Schnelligkeit und Zuverlässigkeit sehr wertvoll.
    Notes: Summary A new method for the identification of fetal hemoglobin (Hb F) in blood stains by reverse-phase high performance liquid chromatography is described. Differentiation between fetal and adult blood stains is based on the existence of γ-chain peaks which are characteristic of Hb F. Very few γ chains appeared on chromatograms of all the adult blood stains examined. The level of Hb F could be determined by measuring the total of chromatogram γ-globin chain areas, and expressing it as a percentage of total Hb. Levels in six cord blood stains on filter paper ranged from 81.1% to 91.3% and remained constant for at least 12 weeks. This method is of great value for its simplicity, sensitivity and speed, and most importantly for its reliability in the field of forensic medicine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204074
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  • 17
    Electronic Resource
    Electronic Resource
    Mössbauer sprectroscopic characterization of iron chlorophyllins (1986)
    Springer
    Hyperfine interactions 29 (1986), S. 1403-1406 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Mössbauer spectra of bis-adducts of pyridine (py) and its derivatives (4-Xpy, where X is CN, CHO, COOCH3, COCH3 and CH3) have revealed that the axial coordination of py and 4-Xpy to iron (III) chlorophyllin gives rise to spontaneous reduction of the central iron (III) ion. A linear correlation between isomer shifts and quadrupole splittings is explained on the basis of the predominant σ-donation from the axial ligand to the central iron ion. The linear dependence of the isomer shifts on the Hammett substituent constants has demonstrated that the larger the isomer shift, the stronger the electron-attracting power of the substituent at the 4-position. The decrease in the quadrupole splitting is ascribed to the relative decrease in the electron density accumulated in the equatorial direction through the σ-donation. The general tendency in the spontaneous reduction of iron (III) chlorophyllin is interpreted in terms of the σ-donor and π-acceptor power of the axial ligands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399496
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  • 18
    Electronic Resource
    Electronic Resource
    Characterization of Prussian blue and its thermal decomposition products (1989)
    Springer
    Hyperfine interactions 46 (1989), S. 723-731 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mixed-valence state of Prussian blue and its thermal decomposition products has been studied by Mössbauer and infrared spectra, and X-ray powder diffraction and conductivity measurements. The57Fe Mössbauer spectra have revealed that the coordination environment of Prussian blue is not changed by the heat-treatment at lower than 200°C while the flipping of the cyano ligands takes place when the heat-treatment temperature exceeds 250°C. The electrical conductivity of the Prussian blue samples heat-treated in vacuo at 300 and 350°C is higher than that of the samples heat-treated at lower temperatures. All the spectral measurements have demonstrated that a new mixed-valence state is produced in Prussian blue by thermally flipping the cyano ligand and quenching the flipped cyano ligand to liquid nitrogen temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398265
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  • 19
    Electronic Resource
    Electronic Resource
    Separation and determination of nitrite ion by affinity chromatography with cyano(pheophytinato a)cobalt(III) charged column (1989)
    Springer
    Chromatographia 27 (1989), S. 461-464 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chlorophyll-bonded stationary phase ; Cyano(pheophytinato a)cobalt(III) ; Pheophytin a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The separation and determination of the nitrite ion by affinity chromatography is described. The good separation of the nitrite ion was obtained by using cyano-(pheophytinato a)cobalt(III) bonded octadecylsilica as the stationary phase and water of pH 4.3 adjusted by acetic acid as the mobile phase. Conventional ion chromatograph was also used for the analysis of the nitrite ion. For the synthetic samples prepared by mixing the nitrite and nitrate ions, analytical values obtained by affinity chromatography were in agreement with calculated values and close to the analytical values obtained by ion chromatography. In the proposed affinity chromatography, the nitrite and nitrate ions could be determined in the concentration range of 0.15–1.0ppm and 0.1–1.0ppm with relative standard deviations (n=10) of 5.3% and 4.7%, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02319564
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  • 20
    Electronic Resource
    Electronic Resource
    Determination of pheophytinatonickel(II) by reversed-phase highperformance liquid chromatography (1988)
    Springer
    Chromatographia 25 (1988), S. 319-323 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Pheophytinatonicke(II) ; Chlorophyll ; Pheophytin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary HPLC determination of pheophytinatonicke(II) (Pheo-Ni) prepared by the replacement of magnesium(II) in chlorophyll with nicke(II) is described. The good separation of PheoNi was obtained by using chemically bonded C18 as the stationary phase and acetone-methanol (50∶50, vol/vol) as the mobile phase. Conventional spectrophotometric method was also used for the determination of PheoNi. For the synthetic samples prepared by mixing (pheophytinato a) nicke(II) [(Pheo-a) Ni] and (pheophytinato b) nicke(II) [(Pheo-b) Ni], analytical values obtained by the spectrophotometric method were very high compared to those obtained by HPLC. In the proposed HPLC method, (Pheo-a) Ni and (Pheo-b). Ni could be determined in the concentration range of 0.028–30μg/ml and 0.038–30μg/ml with relative standard deviations (n=10) of 3.1% and 0.8%, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324707
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