Search results for "ASTER"

Patterns and causes of incongruence between plastid and nuclear Senecioneae (Asteraceae) phylogenies

2010

One of the longstanding questions in phylogenetic systematics is how to address incongruence among phylogenies obtained from multiple markers and how to determine the causes. This study presents a detailed analysis of incongruent patterns between plastid and ITS/ETS phylogenies of Tribe Senecioneae (Asteraceae). This approach revealed widespread and strongly supported incongruence, which complicates conclusions about evolutionary relationships at all taxonomic levels. The patterns of incongruence that were resolved suggest that incomplete lineage sorting (ILS) and/or ancient hybridization are the most likely explanations. These phenomena are, however, extremely difficult to distinguish beca…

Comparative evolution of P–M system and infection by the sigma virus in French and Spanish populations ofDrosophila melanogaster

1992

SummaryIn 1983, an extensive survey of populations ofD. melanogasterwas started in a southern French region (Languedoc) in two non-Mendelian systems: the P–M system of transposable elements and the hereditary Rhabdovirus sigma. Unexpectedly fast-evolving phenomena were observed and interesting correlations were noted, giving similar geographical pattern to the region in both systems. For these reasons, the analysis was continued and extended towards the north (Rhône Valley) and the south (Spain). In the P–M system, all the Languedoc populations evolved from 1983 to 1991 towards the Q type which is characteristic of the Rhône Valley populations. In contrast, M′ strains are currently observed…

Characterization of DrosophilaHemoglobin

2002

In contrast to previous assumptions, the fruit fly Drosophila melanogaster possesses hemoglobin. This respiratory protein forms a monomer of about 17 kDa that is not exported into the hemolymph. Recombinant Drosophila hemoglobin displays a typical hexacoordinated deoxy spectrum and binds oxygen with an affinity of 0.12 torr. Four different hemoglobin transcripts have been identified, which are generated by two distinct promoters of the hemoglobin (glob1) gene but are identical in their coding regions. Putative binding sites for hypoxia-regulated transcription factors have been identified in the gene. Hemoglobin synthesis in Drosophila is mainly associated with the tracheal system and the fa…

Drosophila melanogaster overexpression FAS live longer

2018

FAS and FAS ligand is critical in the control of the extension of extrinsic pathway of apoptosis. In previous studies we have performed transcriptomics peripheral blood cells from centenarians, octogenarians and young persons and we found over expression in centenarians of the FAS receptor. To confirm the role of FAS ligand in longevity across animal species, we have generated Drosophila melanogaster that over expresses this gene using the GAL4-UAS technique. The results show that flies overexpressing FAS increase maximal longevity in twelve percent and average longevity in six percent. Therefore, we confirm that FAS is related to longevity flight.

An insect brain computational model inspired by Drosophila melanogaster: architecture description

2010

The fruit fly Drosophila melanogaster is an extremely interesting insect because it shows a wealth of complex behaviors, despite its small brain. Nowadays genetic techniques allow to knock out the function of defined parts or genes in the Drosophila brain. Together with specific mutants which show similar defects in those parts or genes, hypothesis about the functions of every single brain part can be drawn. Following these experiments, a computational model of the fly Drosophila has been designed with a view to its robotic implementation.

Resting Energy Expenditure of Master Athletes: Accuracy of Predictive Equations and Primary Determinants

2021

Resting energy expenditure (REE) is determined mainly by fat-free mass (FFM). FFM depends also on daily physical activity. REE normally decreases with increased age due to decreases in FFM and physical activity. Measuring REE is essential for estimating total energy expenditure. As such, there are a number of different equations in use to predict REE. In recent years, an increasing number of older adults continue to participate in competitive sports creating the surge of master athletes. It is currently unclear if these equations developed primarily for the general population are also valid for highly active, older master athletes. Therefore, we tested the validity of six commonly-used equa…

Regular Strength and Sprint Training Counteracts Bone Aging: a 10- year Follow-up in Male Masters Athletes

2021

According to cross-sectional and interventional studies, high-intensity strength and impact-type training provide a powerful osteogenic stimulus even in old age. Longitudinal evidence on the ability of high-intensity training to attenuate age-related bone deterioration is currently lacking, however. This follow-up study assessed the role of continued strength and sprint training on bone aging in 40- to 85-year-old male sprinters (n=69) with long-term training background. pQCT-derived bone structural, strength and densitometric parameters of the distal tibia (5% distal-proximal tibia length) and tibial midshaft (50% length) were assessed at baseline and after 10 years. The groups of well-tra…

Wpływ Kościoła katolickiego na dzieje i rozwój Śląska. Przyczynek do dyskusji nad rolą chrześcijaństwa w historii Śląska

2013

Mestieri e competenze nel cantiere di architettura in Sicilia tra Trecento e primo Cinquecento

2016

La documentazione archivistica ha fornito agli studiosi una solida base di dati per ricostruire il quadro delle professionalità operanti nel cantiere di architettura in Sicilia tra la fine del medioevo e il principio dell’età moderna. Un dato certo è innanzitutto l’esistenza di una organizzazione gerarchica che prevedeva almeno tre livelli. Al vertice della piramide si trova la figura del capomastro chiamato a dirigere l’opera e spesso ad assumere un ruolo di tipo “imprenditoriale”. Impegni e responsabilità sono spesso condivisi con un altro maestro, per ragioni di opportunità e per mantenere la libertà di contrarre più impegni lavorativi in contemporanea. Il livello immediatamente inferior…

Transitions from grid-connected to island operation of Smart Microgrids

2019

In this paper a control methodology is presented to perform a bumpless transition from the on-grid to the offgrid of a smart microgrid. The derived controller manages the internal production in order to get to zero the tie-line active and reactive power flows so that the opening of the tie line breaker does not produce significant perturbations. Experimental tests performed on the microgrid built at the Polytechnic University of Bari demonstrated the effectiveness of the proposed control strategy.