1,721,042 research outputs found
Somiglianze di famiglia. Tipologie e classificazioni fra scienza e letteratura
No full textnumero monografico di rivista che discute l'epistemologia delle classificazioni nelle scienze letterarie e umane, negli ambiti della teoria della letteratura, filologia romanza, filologia classica, filologia germanica, antropologia culturale, filosofia della scienza, e con traduzione italiana di un saggio di Rodney Needha
Zinc metalation of Hematoporphyrin and its derivatives in different environmental conditions
No full textMorpho-cytochemical analysis of liver pigmentation during the annual cycle of Amphibians.
No full textL'esame del materiale spermatico ai fini della profilassi della leucosi enzootica bovina
No full textErythrocyte spectrofluorometric abnormalities in myotonic dystrophy during "in vitro" aging.
No full textThe possibility in Myotonic dystrophy (MyD) that a decreased ATP utilization by the membrane may produce modifications in glycoprotein structure and/or in the supramolecular arrangement of some membrane proteins was investigated in human erythrocytes: a) by determining the membrane sialic acid content and the cellular ATP concentration in eight cases of MyD; b) by evaluating the stability of the membrane glycoprotein structure by in vitro ageing experiments; c) by testing the presence of high molecular weight aggregates of proteins on the membrane; d) by evaluating the physico-chemical properties of the membrane by 1-anilino 8-naftalensulfonate as a fluorescent probe. Our evidence suggests that ATP concentration and membrane sialic acid content are within normal values. Only in two cases did a decreased stability of membrane glycoproteins occur while the supramolecular assembly of membrane proteins could be considered as normal. The fluorescent probe behavior after in vitro aging was indicative of a decreased polarity of its micro-environment
Membrane processes in myotonic dystrophy during in vitro aging of erythrocytes.
No full textThe present communication is devoted to investigating the possibility that in myotonic dystrophy (MyD) a decreased ATP utilization by the membrane may produce modifications in glycoprotein structure and/or in the supramolecular arrangement of some membrane proteins. The study was carried out a) by determining the membrane sialic acid content and the cellular ATP concentration in 10 cases of MyD, b) by evaluating the structural modifications of membrane glycoproteins occurring during in vitro incubation, c) by testing the presence on the membrane of high molecular weight aggregates of proteins, and d) by evaluating the distribution of hydrophobic and hydrophilic domains of the membrane by using 1-anilino-8-naphthalene sulfonate (1,8 ANS) as a fluorescent probe. Our evidence suggests that the ATP concentration and membrane sialic acid content are within normal values. Only in two cases did structural modifications of membrane glycoproteins occur while the supramolecular assembly of membrane proteins could be considered normal. The fluorescent probe behaviour after in vitro aging was indicative of a decreased polarity of its environment
Study of the chromatin functional state by means of laser fluorescent microirradiation: preliminary results on human lymphoytes
No full text
Going 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
Identificazione dei leganti e dei pigmenti prelevati dalla Tomba della Badessa Ariperga (ex Convento di San Felice).
No full textLa definizione dei leganti e dei pigmenti presenti in una pellicola pittorica è di fondamentale importanza sia per la comprensione della tecnica impiegata dall'autore e per la sua collocazione storica, che per la definizione degli interventi da mettere in atto a scopo conservativo.
Nel presente lavoro viene identificata la composizione chimica di alcuni pigmenti prelevati dalla tomba della Badessa Ariperga (ex Convento di San Felice, Pavia) mediante differenti tecniche analitiche.
Dal confronto dei risultati ottenuti, mediante questo studio interdisciplinare, risulta che 1) i pigmenti sono delle «terre colorate» o Ocre; 2) attraverso il calcolo della formula minima, considerando come costituenti principali gli elementi determinati quantitativamente, si può dedurre con una ragionevole certezza il tipo di pigmento; 3) si può inoltre escludere la presenza di leganti nella pellicola pittorica esaminata. Pertanto si può a concludere che la tecnica impiegata dall'Autore nella realizzazione degli affreschi della tomba della Badessa Ariperga è quella del «buon fresco»
- …
