Search results for "rius"
showing 10 items of 278 documents
Radial and peripheral clines in northern polymorphic populations of Philaenus spumarius
2009
Geographic variability in the colour polymorphism of Philaenus spumarius (Homoptera) was investigated in the northern parts of Finland, Norway and Sweden. The investigation was directed mainly at peripheral populations south of the Baltic—Arctic divide. The colour phenotypes were found to differ in their “north tolerance”. The phenotypes typ (pt/pt) and lat (pt/pt) were the most, and the phenotype tri (pt/pT) the least tolerant to marginal conditions. Differences in “north tolerance” between the phenotypes cause radial clines to be present in allele frequencies. The radial clines may be caused by the combined effect of several different factors. These include shortness of the thermal growth…
The founder principle, founder selection, and evolutionary divergence and convergence in natural populations of Philaenus
2009
Parts of the archipelago of the Baltic Sea are rising above the water level at a steady, slow rate. Plant species appear on the emerging islands in a definite order, and an early stage and a late stage can be distinguished in the development of meadows on the islands. In 1969–1973 four populations of Philaenus spumarius living in meadows at the early stage had widely different frequencies of the alleles determining colour polymorphism. In the same years three Philaenus populations living on islands with meadows at the late stage had closely similar allele frequencies. The differences between the Philaenus populations in the early stage meadows are ascribed partly to the founder principle an…
Polarization microscopy as a tool for quantitative evaluation of collagen using picrosirius red in different stages of CKD in cats
2016
Chronic kidney disease (CKD) is a relevant disease in feline clinic. The tubulointerstitial damage, with collagen deposition and fibrosis, is an important result of this process. The aim of this study was to quantify and correlate the deposition of collagen and severity of interstitial fibrosis (IF) in the kidney from cats in different stages of CKD. Kidney fragments from 10 adult cats with CKD were analyzed and stained by Masson's trichrome (MT) and Picrosirius red (PSR) for circular polarized microscopy. Random quantitative analysis was performed on MT sections to classify the degree of IF, per field area, with and without circular polarization. Statistics correlations were performed by S…
Life cycle of Renylaima capensis, a brachylaimid trematode of shrews and slugs in South Africa: two-host and three-host transmission modalities sugge…
2012
Abstract Background The life cycle of the brachylaimid trematode species Renylaima capensis, infecting the urinary system of the shrew Myosorex varius (Mammalia: Soricidae: Crocidosoricinae) in the Hottentots Holland Nature Reserve, South Africa, has been elucidated by a study of its larval stages, epizootiological data in local snails and mammals during a 34-year period, and its verification with mtDNA sequencing. Methods Parasites obtained from dissected animals were mounted in microscope slides for the parasitological study and measured according to standardized methods. The mitochondrial DNA cox 1 gene was sequenced by the dideoxy chain-termination method. Results The slugs Ariostralis …
Fullerenes(nC60) affect the growth and development of the sediment-dwelling invertebrate Chironomus riparius larvae
2015
Abstract The possible toxicity of nanoparticles (NPs) to aquatic organisms needs to be investigated for chronic effects at low concentrations. Chronic effects of carbon NPs, fullerenesC60, on the midges of Chironomus riparius at different life stages on larvae and adult midges were investigated. Sediment associated fullerenesC60 were studied by 10-day growth and 42-day emergence tests with artificial sediment at nominal concentration ranges 0.0004–80 mg/kg dry weight. The body length decreased in the lower tested concentrations (0.0025–20 mg/kg), but the effect vanished with higher concentrations. Delayed emergence rate observed at 0.5 mg/kg. The observed effects correlated with analyzed se…
The long-term effects of probiotics in the therapy of ulcerative colitis: a clinical study
2016
Aim: Intestinal dysbiosis seems to be the leading cause of inflammatory bowel diseases, and probiotics seems to represent the proper support against their occurrence. Actually, probiotic blends and anti-inflammatory drugs represent a weapon against inflammatory bowel diseases. The present study evaluates the long-term (2 years) effects of combination therapy (mesalazine plus a probiotic blend of Lactobacillus salivarius, Lactobacillus acidophilus and Bifidobacterium bifidus strain BGN4) on ulcerative colitis activity. Method: Sixty patients with moderate-to-severe ulcerative colitis were enrolled: 30 of them were treated with a single daily oral administration of mesalazine 1200 mg; 30 pati…
Contrasting parental roles shape sex differences in poison frog space use but not navigational performance
2022
Sex differences in vertebrate spatial abilities are typically interpreted under the adaptive specialization hypothesis, which posits that male reproductive success is linked to larger home ranges and better navigational skills. The androgen spillover hypothesis counters that enhanced male spatial performance may be a byproduct of higher androgen levels. Animal groups that include species where females are expected to outperform males based on life-history traits are key for disentangling these hypotheses. We investigated the association between sex differences in reproductive strategies, spatial behavior, and androgen levels in three species of poison frogs. We tracked individuals in natura…
Prefazione. Conservare nel tempo. Tecnologia e programmazione per i Beni Culturali
2011
In questo testo Antonella Cesaroni raccoglie le ricerche e gli studi condotti sul Santuario del SS. Crocifisso in Treia, architettura eclettica dei primi anni del 1900 dell’architetto romano Cesare Bazzani, ma fornisce un “pretesto” per valorizzare della Tecnologia quell’attitudine al controllo che la definisce una disciplina applicata e che trova attuazione in quelle fasi del “processo conservativo” indirizzate specificatamente al progetto di adeguamento, di riuso e di manutenzione cui un manufatto, come quello di Treia, è sottoposto nel corso della sua vita. La conservazione del patrimonio architettonico, sia esso antico o moderno, è inoltre da ritenere affidabile solo riconoscendo al “pr…
Il restauro delle masserie tra conservazione della materia, reintegrazione strutturale e riuso
2010
I contenuti sono relativi all'intervento in un'architettura rurale che è tipica della campagna siciliana. I temi d'interesse sono la conservazione del carattere storico delle "masserie", talvolta allo stato di rudere, e la necessità di insediare nuove destinazioni d'uso e ricostruire la parti crollate in modo che risultino distinguibili. The contents are related to the intervention in rural architecture that is typical of the Sicilian countryside. Themes of interest are the conservation of the historic character of the "farms", sometimes in a state of ruin, and the need to establish new uses and rebuild the collapsed parts so that they are distinguishable.
Algorithms for solving the inverse problem associated with KAK =A^(s+1)
2017
In previous papers, the authors introduced and characterized a class of matrices called {K,s+1}-potent. Also, they established a method to construct these matrices. The purpose of this paper is to solve the associated inverse problem. Several algorithms are developed in order to find all involutory matrices K satisfying K A^(s+1) K = A for a given matrix A∈C^(n×n) and a given natural number s. The cases s=0 and s≥ are separately studied since they produce different situations. In addition, some examples are presented showing the numerical performance of the methods.