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  • 1980-1984  (6)
  • 1975-1979  (7)
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular evolution 20 (1984), S. 167-174 
    ISSN: 1432-1432
    Schlagwort(e): Codon space ; Cluster analysis ; Evolutionary paths
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary We construct a “codon space” in which a given DNA sequence can be plotted as a function of its base composition in each of the three codon positions. We demonstrate that the base composition is very highly nonrandom, with sequences from more primitive organisms having the least random compositions. By using cluster analysis on the points plotted in codon space we show that there is a strong correlation between base composition and type of organism, with the most primitive organisms having the highest A or T content in the second and third codon positions. A smooth transition toward lower A+T and higher G+C content is observed in the second and third codon positions as the evolutionary complexity of the organism increases. Besides this general trend, more detailed structure can be observed in the clustering that will become clearer as the data base is increased.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    International urology and nephrology 15 (1983), S. 225-236 
    ISSN: 1573-2584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Observations with diagnostic ultrasound in renal disease over a 10-year period are reviewed. The advantages of diagnostic methedos involving the least possible discomfort to the patient are emphasized. Ultrasonography is regarded as a reliable noninvasive method for the diagnostic differentiation between renal tumours and cysts. It was used by the authors for this purpose in 740 cases. Renal tumours were found by this method in 622, and renal cysts in 118 cases. Of the 740 patients, 726 underwent surgery. The preoperative ultrasonic diagnosis of renal tumour proved to be correct in 91.8 per cent, that of renal cyst in 88.9 per cent of the respective surgical cases. Ultrasonography also lends itself to the follow-up of polycystic disease of the kidney, being suited for its early diagnosis, as well as to its identification in the stage of renal failure when the traditional diagnostic methods are no longer practicable.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    International urology and nephrology 9 (1977), S. 289-295 
    ISSN: 1573-2584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A surgical case of coexisting renal cyst and tumour is reported, diagnosis having been made preoperatively with the aid of two recent diagnostic procedures. Electron microscopic study of the surgical specimen revealed virus-like intranuclear particles in the malignant tissue.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Chemistry of heterocyclic compounds 11 (1975), S. 147-151 
    ISSN: 1573-8353
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract 3-Hetaryl-7-methoxychromones were obtained by reaction of α-(5-ethoxycarbonyl-2-furyl)-, α-(2-benzofuryl)-, and α-(2-methoxy-carbonyl-5-benzofuryl)-2-hydroxy-4-methoxyacetophenones with methyl formate or ethyl orthoformate, and 3-hetaryl-4-hydroxy-7-methoxy-coumarins were obtained by reaction of the same compounds with diethyl carbonate. Methods for the synthesis of 3-hetaryl-7-hydroxy-chromones from α-furyl- and α-benzofuryl-substituted, 2,4-dihydroxyacetophenones were investigated.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    International urology and nephrology 11 (1979), S. 21-25 
    ISSN: 1573-2584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A case is reported in which diagnosis of a calyceal diverticulum, at the time of observation of cystic appearance, was made by ultrasonography, without requiring special roentgen diagnostic procedures of limited safety.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    International urology and nephrology 13 (1981), S. 345-351 
    ISSN: 1573-2584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Residual urine was measured with the two-dimensional and the gray-scale equipments (Kretz-Technik) in 26 cases each. The results were checked by catheterization. The difference between the ultrasonographic and the catheter values was 20 to 40 ml for the two-dimensional, but only 5 to 10 ml for the gray-scale apparatus. Ultrasonography is regarded as a reliable and entirely harmless procedure, suited for the measurement of residual urine.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    International urology and nephrology 9 (1977), S. 11-15 
    ISSN: 1573-2584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A case of hydronephrosis is reported in which the diagnosis has been confirmed on the ground of renal echography. The physical principles of the method are outlined. Its expediency, safety and efficiency are emphasized. It is considered the most reliable diagnostic procedure if hydronephrosis is suspected in case of renal occlusion.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    International urology and nephrology 12 (1980), S. 291-309 
    ISSN: 1573-2584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Diagnostic ultrasound has been used over the last eight years for the demonstration of various space-occupying lesions of the urogenital tract, for the estimatiion of the prostate size and for the identification of intrascrotal processes and tumor. 918 patients were studied by this method. In 595 (87.3 per cent) of the 682 surgical cases in this series ultrasonic diagnosis was confirmed by the surgical finding. False-positive and false-negative results totalled 17.7 per cent. The method is particularly suited, for the differential diagnosis of renal cysts from tumours without the need for other procedures involving discomfort to the patients. This procedure, which is free from any iatrogenic hazard, provides accourate information on the size and structure, of space-occupying lesions.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    International urology and nephrology 14 (1982), S. 109-114 
    ISSN: 1573-2584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Diagnostic reliability of ultrasonic scanning in urology is evaluated in the light of 10 years' experience. This recent, non-invasive, diagnostic method, in association with the traditional investigation procedures, is regarded as reliable and harmless, as illustrated by published results and the author's own observations.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 10
    ISSN: 1588-2837
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Abstract Были исследованы реакции ацеталяX (чувствительного к основаниям) в щелочных средах. Было найдено, что разложениеX зависит от концентрации OH−. При низких концентрациях [OH−] ([OH−]≤10−3 M)X переходит вI, в то время как при [OH−]=10−2 M, он разлагается через равновесие энол-энолят (IV⇋VI) доV. Это необычное превращение катализированное основанием было объяснено на основе высокой подвижности α-протоновX и стабильностьюI по отношению к нуклеофильным реагентам.
    Notizen: Abstract The reactions of base sensitive acetalX under alkaline conditions were studied. The decomposition ofX depends on the OH− concentration. At low [OH−]≦10−3 M,X transforms into I, while at [OH−]=10−2 M, it decomposes to V via an enol-enolate equilibrium (IV⇌VI). These unusual base-catalyzed transformations are explained by the high mobility of the α-proton ofX, and by the stability of I towards nucleophilic reagents.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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