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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 18 (1968), S. 129-141 
    ISSN: 1432-0584
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Direct marrow cytogenetic preparations were examined in five cases of pernicious anemia, exhibiting various morphologica and numerical anomalies. The morphological alterations consisted of increased breakage, vacuolisation of chromatid, enhancement of secondary constriction, incomplete contraction, spreading of centromere and telomere association. The multicentric giant chromosomes were apparantly the result of telomeric fusions. The monosomy which was observed in the hypodiploid cells of the three cases was not confined to any specific group of chromosomes. A specific anomaly which could be chracterised for pernicious anemia has not been found. The structural and the numerical anomalies described seem to be the result of DNA metabolic disorder.
    Notes: Zusammenfassung Bei fünf Kranken mit dekompensierter perniziöser Anämie wurden durch zytogenetische Untersuchung mit Hilfe des direkten Knochenmark-und in einem Fall zusätzlich des Blutkulturverfahrens numerische und strukturelle Anomalien festgestellt und beschrieben. Eine Hypodiploidie ist ein häufiger Befund und kommt in verschiedenen chromosomengruppen vor. Diese Hypodiploidie wird ebenso als Folge der der perniziösen Anämie zugrunde liegenden DNS-Stoffwechselstörung gedeutet wie eine Reihe von strukturellen Anomalien, nämlich eine Ausbreitung des Centromers, eine Ausdehnung der sekundären Konstriktionen mit Auftreten von Chromatidlücken und-brüchen. Telomerische Assoziationen führten ferner zu di-und multicentrischen Chromosomen. Endlich fanden sich unvollständige Kontraktionen und Ausbildung von “Riesen-Chromosomen” und häufig eine Vakuolisierung innerhalb des Chromatids. Eine für die perniziöse Anämie pathognomische Anomalie wurde-in Übereinstimmung mit den Befunden anderer Autoren—nicht gefunden. Die bei perniziöser Anämie von der Norm abweichenden zytogenetischen Befunde reflektieren die der Erkrankung zugrunde liegende DNS-Stoffwechselstörung.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 51 (1973), S. 347-350 
    ISSN: 1432-1440
    Keywords: Thiamphenicol ; Chloramphenicol ; bone marrow depression ; Thiamphenicol ; Chloramphenicol ; Knochenmarkdepression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 20 Patienten wurden mit durchschnittlich 19,5 g des Chloramphenicolderivates Thiamphenicol behandelt. Vor, während und nach der Therapie wurden bei allen Patienten das periphere Blutbild, die Serumeisenkonzentration und die Eisenbindungskapazität fortlaufend kontrolliert. Bei einem Teil der Patienten wurden zusätzlich ferrokinetische sowie cytologische, cytogenetische und elektronenmikroskopische Untersuchungen des Knochenmarkes vorgenommen. In der Mehrzahl der Fälle wurde eine signifikante Abnahme des Hämatokrit, verbunden mit einer Reticulocytopenie, beobachtet. Gleichzeitig fand sich eine signifikante Zunahme der Serumeisenkonzentration und eine mit steigender Dosis zunehmende Verzögerung der Plasmaeisenclearance, Abnahme der Plasmaeisenumsatzrate und eine Verminderung der Eiseninkorporation. Im Knochenmark war die Erythropoese gegenüber den Ausgangswerten im Sinne einer Erythroblastphthise vermindert. Die unreifen Vorstufen der Hämatopoese wiesen z. T. Plasmavacuolen auf, die elektronenmikroskopisch extremen Dilatationen des endoplasmatischen Reticulums entsprachen. Cytogenetische Veränderungen waren unter TAP-Einfluß nicht nachweisbar. — Die beschriebenen Veränderungen sind spontan reversibel.
    Notes: Summary 20 patients were treated with an average dose of 19.5 g of the chloramphenicol-analogue Thiamphenicol (TAP). Before, during and after therapy, peripheral blood counts, serum iron and total iron binding capacity were controlled continuously. In some of the patients of the group, additional ferrokinetic, cytogenetic and electron microscopic studies of the bone marrow were carried out. The majority of the cases showed a significant decrease of packed cell volume with reticulocytopenia. A concomitant increase in the serum iron concentration was observed. In correlation with the dosage of TAP a prolongation of the59Fe clearance, a decrease in plasma iron turnover and iron incorporation were found. The bone marrow showed erythroblastopenia with vacuolisation of precursor cells. Electronmicroscopically the vacuolisation of the cytoplasma of bone marrow cells was recognised as a partly extreme dilatation of the endoplasmic reticulum. A change in the chromosomal structure was not observed. The observations described were spontaneously reversible.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 109 (1991), S. 103-114 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Triweekly trawling around low tide during daylight at 1, 2, 3, and 4 m depths along north Kuwait Bay's extensive intertidal mudflats from 1 April 1985 through 9 December 1986 showed the catchability ofMetapenaeus affinis (H. Milne-Edwards, 1837),M. stebbingi Nobili, 1904,Parapenaeopsis stylifera (H. Milne-Edwards, 1837), andPenaeus semisulcatus De Haan, 1844 differed significantly with depth and season. All species were significantly more catchable in 1 and 2 m depths than in 3 and 4 m depths.M. affinis showed the clearest and most consistent relationship with depth: catchability in 1 m depths was significantly greater than that in 2 m depths (24.9 vs 5.4 per 5-min tow), and catchability in 1 and 2 m depths was significantly greater than that in 3 and 4 m depths (15.2 vs 1.4 per 5-min tow).M. affinis also showed the clearest relationship of increasing size with depth. Shrimp captured in 1 m depths were significantly smaller (~ 14 mm carapace length, CL) than those captured in 2 m depths in the spring (~23 mm CL) and summer (~ 18 mm CL). In the absence of low-salinity waters and intertidal vegetation, it is believed that the edge of the advancing and receding tide over the mudflats, i.e. the shallowest waters, provides juvenile shrimp, particularlyM. affinis, protection from predation.
    Type of Medium: Electronic Resource
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  • 4
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    Unknown
    Kingston, Jamaica : Periodicals Archive Online (PAO)
    Social and economic studies. 31:3 (1982:Sept.) 129 
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archives of toxicology 31 (1973), S. 39-49 
    ISSN: 1432-0738
    Keywords: Cytogenetics ; Human Chromosomes ; Chromosome Aberrations ; Benzene ; Benzene Myelopathy ; Cytogenetik ; Menschliche Chromosomen ; Chromosomenaberrationen ; Benzol ; Benzolmyelopathie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurden 15 benzolexponierte Industriearbeiter und 14 Kontrollpersonen mittels des Routineblutkulturverfahrens untersucht. Untersuchungen im direkten Knochenmarkverfahren erfolgten bei 4 benzolexponierten Arbeitern sowie an 2 Kontrollpersonen. Die benzolexponierten Arbeiter wurden nach Dauer der Benzolexposition in 2 Gruppen eingeteilt. Die Gruppe I beinhaltet 7 Personen mit einer Expositionszeit zwischen 11 und 20 Jahren, die Gruppe II beinhaltet 8 Personen mit einer Expositionszeit zwischen 2 und 5 Jahren. Die Aberrationen vom Chromatidtyp waren bei der Gruppe I mit 18,2% und bei der Gruppe II mit 15,0% (bzw. beide Gruppen 16,7%) gegenüber denen der Kontrollpersonen mit 13,2% erhöht. Die instabilen Chromosomenaberrationen zeigten bei der Gruppe I mit 2,3% und bei der Gruppe II mit 2,2% keine Unterschiede, dagegen waren sie gegenüber der Kontrollgruppe mit 0,3% signifikant hoch. Die stabilen Chromosomenaberrationen lagen in der Gruppe I bei 2,8%, in der Gruppe II bei 1,8%. Sie lagen mit einem Durchschnitt von 2,3% gegenüber den Kontrollen mit 0,2 % ebenfalls signifikant hoch. Die Gruppe I und II zeigen untereinander nur geringe Unterschiede. Von den 15 untersuchten Benzolarbeitern wies einer eine Benzolmyelopathie auf.
    Notes: Abstract Cytogenetic studies of routine culture of peripheral blood were carried out in 15 workers exposed to chronic benzene and 14 controls. Chromosome studies of direct bone marrow preparations were performed on 4 individuals and 2 controls. For each experimental subject or control 50 mitoses of karyotypic level were analyzed, while the number of bone marrow mitoses analyzed was modest. The aberrations were classified by chromatid type and chromosome type, the latter including: a) unstable changes, i.e. rings, dicentrics or fragments and b) stable monocentric anomalies, e.g. deletions, translocations and trisomies. The workers were divided into two groups depending on the period of exposure to benzene. Group I included 7 men with 11 to 20 years' exposure. Group II consisted of 8 men with 2 to 5 years' exposure. The percentage of chromatid type of aberrations in blood cells was 18.2 in group I, 15.0 in group II and 13.2 in controle. The unstable chromosome anomalies in group I (2.3%) and group II (2.2%) were significantly higher than in controls (0.3%). The stable chromosome anomalies in group I (2.8%) and group II (1.8%) were also considerably higher than in controls (0.2%). The chromosomal analysis of bone marrow cells showed similar changes. The relatively increased rate of aberrations m group I was attributed to a 58-year-old male with benzene myelopathy who had 30% chromatid type and 14% chromosome type of anomalies. A large number of his bone marrow metaphases exhibited blurred, sticky chromosomes with bridges of chromatin and fragments. The bone-marrow smears from the same specimens were hypoplastic with a slight increase in the number of myeloblasts and promyelocytes (4.5%). The band and segmented neutrophilic cells lacked specific granules in most cells. It is concluded that the chromosome damaging effect of benzene may be useful for the evaluation of benzene intoxication, providing that other agents known to produce chromosome aberrations are ruled out. Serial cytogenetic studies on subjects exposed to benzene may contribute to the solution of the problem related to preleukaemia, as the incidence of acute leukeamia in persons exposed to benzene is about 20 times higher than expected.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 8 (1968), S. 209-215 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Résumé A l’aide du modèle des deux fluides on a obtenu des équations de London modifiées pour les supraconducteurs de deuxième espèce dans l’état de Schubnikov (H c1〈H〈H c2). On a tenu compte de l’effet des électrons normaux qui forment les noyaux des lignes de vortex. Sous certaines conditions les équations peuvent être réduites aux équations de London. On a aussi obtenue le champ électrique à l’intérieur du supraconducteur ainsi que les équations de champ.
    Abstract: Zusammenfassung Ausgehend vom Zweiflüssigkeitsmodell wurden modifizierte London-Gleichungen für einen Typ II-Supraleiter in der Schubnikov-Phase (H c1〈H〈H c2) berechnet. Der Einfluß der normalleitenden Elektronen, welche den Kern der Flußlinien bilden, wurde berücksichtigt. Unter geeigneten Annahmen können aus den vorliegenden Beziehungen die London-Gleichungen abgeleitet werden. Das elektrische Feld im Supraleiter und die Feldgleichungen wurden ebenfalls hergeleitet.
    Notes: Abstract Using the two fluid model, modified Londons equations have been obtained for the type II superconductors in the Schubnikov state (H c1〈H〈H c2). The effect of the normal electrons which form the cores of the flux vortices have been included. These equations can be reduced to the Londons equations under suitable assumptions. The electric field inside the superconductor and the field equations have also been obtained.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 1 (1966), S. 409-410 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A sensitive spectrophotometric method has been developed for the determination of microamounts of thorium using 0.05% thorin in a 3M perchloric acid solution as a chromogenic reagent and measuring the absorbance at 544 nm. The complex of thorium thus formed, is stable for more than two months with a constant absorbance of ±0.55%. Beer's law is obeyed from 0 to 25 μg g−1 of thorium in a solution with a molar absorptivity (ɛ544 nm) = 1.69×104 M−1 cm−1 at 26±1 °C. Among the anions tested, only phosphate, acetate and cyanide at 〉200-fold excess of thorium interfere in the determination, whereas cations like Zn(II), Al(III), Na(I), Mg(II), and Ca(II) do not effect the absorbance. Thorium can be determined in the presence of oxalate, nitrate, tartrate, sulfate, thiosulfate, citrate, and ascorbate. The accuracy of the method has been checked by measuring the known concentration of thorium in the range of 100 μg-5 mg g−1 and found to be in the range of 7.7–0.9%. The method has been applied successfully to determine thorium at μg g−1 level in local ore samples with a precision of ±0.3%. The sensitivity of the method on Sandell's scale is 0.082±0.002 μg g−1 cm−1.
    Type of Medium: Electronic Resource
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