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  • Column liquid chromatography  (2)
  • Hydrodynamic stability  (2)
  • Isozymes  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 717-726 
    ISSN: 0392-6737
    Keywords: Hydrodynamic stability ; Convection and heat transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si dà una descrizione, in termini di un approccio di unoscillatore armonico, di moti in oscillazione crescente, per spinta idrostatica, cioè l'insorgenza di convezione oscillatoria in uno strato di fluido soggetto a vari vincoli termici e meccanici. Quando lo smorzamento si annulla, si definiscono i valori di soglia. Si sottolinea anche che l'oscillazione crescente è una conseguenza dell'accoppiamento sincrono delle forze che agiscono nel sistema.
    Abstract: Резюме В приближении гармонического осциллятора предлагается описание гидростатических устойчивых движений, т.е. возникновение осциияторной конвенции в слое жидкости, на который наложены различные тепловые и механические ограничения. При исчезающе малом затухании мы определяем пороговые значения. Мы также отмечаем, что устойчивость является следствием синхронной связи сил, действующих в системе.
    Notes: Summary A description of buoyancy-driven overstable motions,i.e. the onset of oscillatory convection in a fluid layer subjected to various thermal and mechanical constraints is given in terms of aharmonic-oscillator approach. At vanishing damping we define the threshold values. We also point out that overstability is a consequence of thesynchronous coupling of the forces acting in the system.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1057-1062 
    ISSN: 0392-6737
    Keywords: Hydrodynamic stability ; PACS 47.25.Qv ; Convection and heat transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si danno nuove previsioni teoriche che riguardano la sovrastabilità di fluidi viscoelastici nei termini del numero di Prandtl e del rapporto tra il rilassamento viscoelastico e i tempi di diffusione termica.
    Abstract: Резюме Предлагаются новые теоретические предсказания, касающиеся устойчивости упруговязких жидкостей. Предложенный подход основан на числе Прандтля и отношении времени упруговязкой релаксации к времени термодиффузии.
    Notes: Summary New theoretical predictions concerning overstability of viscoelastic fluids are given in terms of the Prandtl number and the ratio of viscoelastic relaxation to thermal diffusion times.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 73 (1987), S. 433-439 
    ISSN: 1432-2242
    Keywords: Hordeum chilense ; Tritordeum ; C-banding ; 6-phosphogluconate dehydrogenase ; Malate dehydrogenase ; Isozymes ; Isozyme markers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A study of 6-phosphogluconate dehydrogenase and malate dehydrogenase isozyme expression in Triticum turgidum conv. durum /Hordeum chilense monosomic addition lines has revealed the location of two structural genes, 6-pgd-H ch 2 and Mdh-H ch 1, on chromosome 1Hch of H. chilense. The homoeology between 1Hch and other chromosome of Triticeae related species is discussed on the basis of isozyme gene analysis.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 73 (1987), S. 690-698 
    ISSN: 1432-2242
    Keywords: Hordeum chilense ; Tritordeum ; Esterases ; Glutamate oxaloacetate transaminase ; Phosphoglucomutase ; Isozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Polyacrylamide and starch gel electrophoresis of esterase (EST), glutamate oxaloacetate transaminase (GOT) and phosphoglucomutase (PGM) isozymes in Hordeum chilense, Triticum turgidum conv. durum, the amphiploid H. chilense X T. turgidum (Tritordeum), and the durum wheat/H. chilense monosomic addition lines revealed the chromosomal location of one EST locus, two GOT loci and one PGM locus. Loci Est-H ch1 and Got-H ch2 were found on chromosome 6Hch,Got-H ch3 on chromosome 3Hch, and Pgm-H ch1 on chromosome 4Hch. These results lend evidence for the assumed homoeology relationships between chromosomes of Triticeae species.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion-pair and GPC separations ; Amoxicillin oligomers ; β-Lactam ring polymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Polymeric substances formed from concentrated sodium amoxicillin in an aqueous solution have been separated using two high-performance liquid chromatographic methods. We used a C18 reversed-phase column with tetrabutylammonium chloride as an ion-pairing agent with an acetonitrile gradient and a TSKgel G2500PWxl column with water as the solvent for gel permeation chromatography. The separated materials, ranging in size from the monomer to the tetramer, have been characterized by functional-group chemical analysis, while the identification of the piperazine-2,5-dione was done using a pure standard. A greater number of peaks which were also better defined were obtained using the ion-pair reversed-phase method, and open and closed beta-lactam ring polymer forms could be distinguished. Using the gel permeation method, only a few monomer, piperazine-2,5-dione, dimer, trimer and combined amoxicillin trimer and tetramer peaks were obtained with water, although those obtained were quite well defined. The data on the time-course of formation of the oligomers and the amoxicillin degradation product were virtually identical by both methods.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Prostaglandins ; C18 Solid phase extraction ; Radioimmunoanalysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The aim of this study has been the evaluation of an automated system for on-line sample preparation using solid phase extraction and HPLC purification for the measurement of prostanoids in urine. We have established the optimum precolumn and column conditions for this analysis. The manual extraction —HPLC procedure furnishes lower recoveries and higher coefficients of variation than those obtained by the automated on-line procedure. The automated system has been applied to prostanoid analysis of human urine samples from subjects exposed to lead.
    Type of Medium: Electronic Resource
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