1,721,213 research outputs found
Anodic behaviour of the antineoplastic agent amethopterin at a mercury electrode and its determination in body fluids by liquid chromatographywith indirect anodic polarographic detection
No full textAmethopterin has been found to be anodically electroactive on mercury due to a depolarization effect arising from the formation of a sparingly soluble mercury complex. High performance liquid chromatography with anodic polarographic (sampled dc) detection at +0.19 V vs Ag/AgCl has been employed for the determination of the drug in body fluids. Detector response was found to be linear in the range 5 - 1000 ng on column. A detection limit of 1.5 micromolar amethopterin in serum was achieved. The within-day and day-to-day coefficient of variation at the 10 microg/mL level were 1.5 and 3.7 % respectively
Determination of purine, pyrimidine and pteridine derivatives in body fluids by high performance liquid chromatography with indirect anodic polarographic detection
No full textReversed-phase gradient elution - electrochemical detection: simultaneous determination of gamma-aminobutyric acid and polyamines in biological tissues
No full textStrut-and-tie models to design bridge floors subjected to horizontal actions
No full textStrut-and-Tie Model (STM), conceived by the French builder François Hennebique as a simple representation of a reinforced concrete element subjected to shear and bending, has been later developed by Ritter and Mörsch. In the twentieth century several studies have been carried out about STM and the results constitute the fundamentals of some prescriptions in many international codes.
Schlaich et al. 19871 proposed a global approach to the structural design by means of STM. Even though nowadays STM is widely used, several difficulties can be still encountered when dealing with the choice of the model that can best fit the actual configuration (i.e. the ‘optimum’ model). Such problems can be even more relevant when dealing with non-standard cases.
In this paper, the case of bridge decks subjected to horizontal actions is presented. Different methods to reach STM are shown: from FEM to Load Path Method to Bi-directional Evolutionary Structural Optimization method.
The aim is to use the examined case to evaluate the efficacy of these methods to gain experience in designing r.c. structures with STM. Moreover, in the paper the influence on the model of the geometry of the bridge slab as well as the distribution of longitudinal and transversal deck beams have been investigated
Determinazione dei livelli urinari di pseudouridina mediante cromatografia liquida - rivelazione elettrochimica
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Biosensori amperometrici basati su tirosinasi e laccasi immobilizzati in polimeri elettrosintetizzati per la rivelazione di composti fenolici
No full textBiosensore a tirosinasi immobilizzata in film polimerici elettrosintetizzati per la determinazione di fenoli in tracce
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