Search results for "Ancestor"
showing 10 items of 43 documents
Aging in Sponges
2003
The sponges (phylum Porifera) are the lowest and phylogenetically oldest, still extant phylum of Metazoa [1, 2]. These animals are considered as the evolutionary earliest living relicts of the successful transition from the (perhaps) unicellular to the multicellular state [2]. Evidence has been presented by molecular phylogenetic analysis that sponges share a common ancestor with the other metazoan phyla, the hypothetical Urmetazoa [2, 3].
Protein SRP54 iz morske spužve Geodia cydonium
2002
In the systematic search for phylogenetically conserved proteins in the simplest and most ancient extant metazoan phylum – Porifera, we have identified and analyzed a cDNA encoding the signal recognition particle 54 kD protein (SRP54) from the marine sponge Geodia cydonium (Demospongiae). The signal recognition particle (SRP) is a universally conserved ribonucleoprotein complex of a very ancient origin, comprising SRP RNA and several proteins (six in mammals). The nucleotide sequence of the sponge cDNA predicts a protein of 499 amino acid residues with a calculated Mr of 55175. G. cydonium SRP54 displays unusually high overall similarity (90 %) with human/mammalian SRP54 proteins, higher th…
IL potere degli antenati : il “dispositivo soterico ”nella lex sacra di Selinunte
2013
La colonna "B" della Lex Sacra di Selinunte prescrive una procedura catartica connessa verosimilmente a casi di spargimento di sangue, soprattutto in ambito familiare. Essa ci mostra come a unire i diversi elementi cardine della procedura stessa sia il filo di uno scambio e un riconoscimento reciproco tra diversi livelli di socialità, che ha come unica inviolabile regola che l’applicazione delle prassi cultuali non contrasti con l’interesse generale della polis. Due elementi chiave emergono: a) in primo luogo, la coerenza cronologica delle testimonianze rafforza la pertinenza di queste correlazioni; b) soprattutto emerge con chiarezza, almeno a mio avviso, la relazione con la sfera dell’anc…
Cappella Sistina: racconto pittorico
2020
Monumento della genialità dell’arte rinascimentale, la Cappella Sistina è un racconto pittorico delle varie tappe della storia dell’Umanità in prospettiva cristiana. Un progetto che prende slancio dall’atto della Creazione, attraversa narrazioni e passioni delle Storie di Mosè e di Cristo, e giunge fino all’anticipazione del Giudizio Universale. Sia per la meraviglia che si prova nel fare i primi concitati passi tra stuoli di turisti, sia per quel senso di straniante familiarità generato dagli innumerevoli riadattamenti contemporanei dei suoi capolavori, la Cappella Sistina non smette di stupire. Prendendo le mosse da una prospettiva assai diversa rispetto a queste riletture creative e a qu…
The coalescent in population models with time-inhomogeneous environment
2002
AbstractThe coalescent theory, well developed for the class of exchangeable population models with time-homogeneous reproduction law, is extended to a class of population models with time-inhomogeneous environment, where the population size is allowed to vary deterministically with time and where the distribution of the family sizes is allowed to change from generation to generation. A new class of time-inhomogeneous coalescent limit processes with simultaneous multiple mergers arises. Its distribution can be characterized in terms of product integrals.
Molecular Phylogenetic Analyses in Court Trials
2010
Molecular phylogenetics allows reconstructing of the genealogy and evolutionary history of organisms from information on their nucleotide or amino acid sequences. When sequences are derived from very fast evolving organisms, such as ribonucleic acid (RNA) viruses, changes accumulate in a few days or weeks, thus allowing the reconstruction of very recent evolutionary events in the history of these populations. One such event is the transmission of one of these viruses, for instance human immunodeficiency virus (HIV) or hepatitis C virus (HCV), from an infected person to another. This occasionally results in a legal demand seeking for compensation and/or punishment for the transmitter. Hence,…
Enamel Prism Patterns of European Hominoids — and Their Phylogenetical Aspects
1981
Everybody concerned with questions of taxonomy and phylogeny knows that a large part of information used to classify fossil vertebrates is derived from teeth. This comes from the reasoning that teeth are the best mineralized portions of the skeleton and thus usually also the best preserved remains. The best preserved portion of teeth is again the most highly mineralized — the enamel. That the enamel shows a so-called prism pattern, which differs markedly within mammals and also within the primates, is well known since Carter (1922) and Regan (1930) published articles concerning the variability of enamel prism patterns. These were for the first time described by Tomes in 1848. An intensive i…
The Origin of Metazoan Complexity: Porifera as Integrated Animals
2011
SYNOPSIS. Sponges [Porifera] are the phylogenetically oldest metazoan phylum still extant today; they share the closest relationship with the hypothetical common metazoan ancestor, the Urmetazoa. During the past 8 years cDNAs coding for proteins involved in cell-cell- and cell-tissue interaction have been cloned from sponges, primarily from Suberites domuncula and Geodia cydonium and their functions have been studied in vivo as well as in vitro. Also, characteristic elements of the extracellular matrix have been identified and cloned. Those data confirmed that all metazoan phyla originate from one ancestor, the Urmetazoa. The existence of cell adhesion molecules allowed the emergence of a c…
Πλησίον τοῦ τείχους. Aree di culto rupestri e ‘vie sacre’ presso le mura nella Sicilia di età classica ed ellenistica
2020
The niches hewn in the rock in proximity to city gates and-walls are a recurring trait of the peri-urban landscape of Sicilian towns, especially in the south-eastern part of the island. Niches are pierced too, in multiple rows, on the walls of former quarries, in most cases close to the city walls, or in artificial caves used for cultic purposes, as inscriptions and traces of offerings testify. The excavations of Paolo Orsi in the latomie of Syracuse and Acre, in the rock or cave sanctuaries of Noto and Acre itself, and in the upper terrace of the theatre of Syracuse, suggested the main recipients of such worship were some “minor” deities like the Nymphs, the Muses or the Paides, and above …
Ancora sulle stele e le edicole dipinte di Lilibeo: immagini, formule, funzioni
2020
Il contributo esamina le stele e i naiskoi funerari dipinti di Lilibeo (Sicilia), recentemente incrementati da due nuove acquisizioni. Sono presi in considerazione i (pochi) dati contestuali, oltre a tipologia, iconografia e formule epigrafiche, allo scopo di mettere in luce specificità, funzioni e messaggi di tali manufatti. Alcuni elementi “trasversali” di carattere antiquario e stilistico, oltre ai dati epigrafici, attestano una sostanziale contemporaneità delle stele più semplici con singolo personaggio stante, con melograno in mano, e dei più elaborati naiskoi con “Totenmahlmotiv”, nella tarda età repubblicana. Le chiare differenze di morfologia, iconografia, formule epigrafiche e luog…