89,300 research outputs found
Thermal and microscope analysis as a tool in the characterisation of ancient papyri
No full textThermal and microscope analysis as a tool in the
characterisation of ancient papyri (2004)
E. Franceschi, G. Luciano, F. Carosi, L. Cornara, C. Montanari -
Abstract:
Analyses of papyrus plants (Cyperus papyrus L.) from the Botanical Garden of the University of Genova and Ciane River (Siracusa) were used as a basis for the detection of histological features in papyrus paper. Both modern and ancient papyrus papers were analysed. Modern papyrus were manufactured at “Museo del Papiro di Siracusa”; two types of ancient papyrus (Egyptian and Greek–Roman, from Cairo Archaeological Museum) were studied. Sections of paper and plant stalks, taken 20 cm from the top, were examined under a scanning electron microscopy (SEM) and optical microscope (OM). The lignificated parts of both the plant and paper were either red (using acid flouroglucine) or blue–green (using Toluidine Blue) and were refracting under polarised light microscopy. Calcium oxalate crystals and starch granules were also detected. It was clear that the ancient Egyptian paper is richer in starch in comparison to the Roman one. It could be presumed that the Egyptian paper contains starch, a material which naturally occurs in the plant as a reserve. It was, in fact, preferably found in the residuals of the vascular bundle sheath. Microscope observations were compared with the results obtained by thermal and calorimetric analyses (TG and DSC). Thermal curves were different depending on which part of the plant was used to manufacture the papyrus and probably depend on the amount of cellulose and lignin present. Moreover, the Egyptian and Greek–Roman were also different in thermal behaviour
La malaria di importazione in Lombardia. II. Rassegna della casistica ospedalizzata 1981-1985
No full textWe carried out a research on hospitalized cases of imported malaria in Lombardy in the period 1981-1985 to characterize the risk factors and the clinical features of this phenomenon and to identify its trend in comparison with the previous quinquennium (Carosi et al., 1983). 1) Prevalent factors of risk are: the P. falciparum etiology (68%), the african origin of the strains, the work motivated travelling (56%) and a long period of stay (56%) in the summer-autumnal season (62%). On the contrary, in the previous quinquennium, short periods of stay during winter season prevailed. 2) As far as the chemoprophylaxis is concerned, it has been adopted in 55% of the cases, but only in 14 cases it was correct. In 52% of the cases, symptoms were noted within 20 days of re-entry, and in 17% of the cases they started abroad. In 62% of the cases a correct diagnosis was made within 10 days from the onset of symptoms and in 72% fever disappeared within 48 hours after therapy. Data show an inversion of the trend of the previous quinquennium and evidentiate a wider use of chemoprophylaxis and a more effective therapeutic action by the Sanitary Structure in Lombardy. The Authors stress the need for improvement in malaria control programs by Italian industries working in Developing Countries (roads and dams construction) and the increasing prophylactic problems related to che widespread extent of chloroquine resistant P. falciparum strains in Africa. Our causistry shows the outcome of 14 falciparum malaria cases in spite of correct chloroquine chemoprophylaxis
Imported malaria in Lombardia. A second review of hospitalized cases in 1981-1985.
No full textWe carried out a research on hospitalized cases of imported malaria in Lobardy in the period 1981-1985 to characterize the risk factors and the clinical features of this phenomenon and to identify its trend in comparison with the previous quinquennium (Carosi et al., 1983) 1) Prevalent factors of risk are: the P falciparum etiology (68%), the african origin of the strains, the work motivated travelling (56%) and a long period of stay (56%) in the summer-autumnal season (62%). On the contrary, in the previous quinquennium, short periods of stay during winter season prevailed. 2) As far as the chemoprophylaxis is concerned, it has been adopted in 55% of the cases, but only in 14 cases it was correct. In 52% of the cases, symptoms were noted within 20 days of re-entry, and in 17% of the cases they started abroad. In 62% of the cases a correct diagnosis was made within 10 days from the onset of symptoms and in 72% fever disappeared within 48 hours after therapy. Data show an inversion of the trend of the previous quinquennium and evidentiate a wider use of chemoprophylaxis and a more effective therapeutic action by the Sanitary Structure in Lombardy. The Authors stress the need for improvement in malaria control programs by Italian industries working in Developing Countries (roads and dams construction) and the increasing prophylactic problems related to the widespread extent of chloroquine resistant P. falciparum strains in Africa. Our causistry shows the outcome of 14 falciparum malaria cases in spite of correct chloroquine chemoprophylaxis
Coercivity Concepts and Recession Function in Constrained Problems
No full textThe existence of minimum points for a real function f over a closed and unbounded set D is analyzed, focusing on the behavior of f along the so called recession directions of D. With this regard several new coercivity concepts are introduced together with an extension of the recession function. Relationships between coercivity and the behavior of the introduced recession function are studied, giving particular attention to their fundamental role in deriving optimality conditions. Necessary and sufficient conditions guaranteeing the existence of the minimum points are given as well as results related to the boundedness of the set of optimal solutions
Il Progetto MASTER. Un approccio strategico al paziente HIV infetto nella vita reale. Nota I. Il protocollo Master-1
No full textLa sindrome cerebrale
No full textVengono descritte le caratteristiche epidemiologiche e cliniche delle principali cause di infezione con sintomatologia cerebrale in ambiente a risorse limitat
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