1,721,073 research outputs found
An in vitro investigation of the actions of reproductive hormones on the cervix of the ewe in the follicular stage: the effects of 17β-oestradiol, oxytocin, FSH and AA on the cervical pathway for the synthesis of PGE2
No full textThe expression of ERα, OTR, cPLA2, COX-2 and PPARγ in the cervix of the ewe during the oestrous cycle
No full textStudy of innovative water repellent systems for the preservation and restoration of artificial stone materials
No full textIl lavoro di tesi riguarda lo studio di malte idrorepellenti preparate con l’utilizzo di additivi idrofobizzanti per la protezione, la manutenzione e il recupero delle superfici architettoniche storiche e civili. Questo studio considera in particolare i processi di degrado causati dalla presenza di acqua (per azione diretta o come mezzo di trasporto di inquinanti e sali solubili) sui materiali dell’edilizia e valuta la durabilità di malte idrorepellenti in varie condizioni ambientali. Lo studio ha considerato l’influenza di diversi additivi idrorepellenti sull’idratazione di alcuni leganti e la resistenza all’azione di degrado fisico conseguente la cristallizzazione di Sali o l’esposizione a radiazioni UV e alla pioggia. Alcuni impasti sono stati applicati su modelli di murature sottoposti a risalita capillare di soluzioni saline. Lo sviluppo della ricerca ha previsto il ricorso a numerose tecniche analitiche (FT-IR, TG-DSC, SEM-EDX, XRD, MIP), test normati e analisi non invasive.The thesis deals with the study and development of water repellent mortars, made with water- repellent admixtures , suitable for the protection, maintenance and restoration of historical and civil buidings. This study deals with the damage processes due to the action of water (both as direct action and or as carrier of pollutants and soluble salts) on the building materials and evaluates the durability of water-repellent mortars in different environmental conditions. The study considers the interactions of different water repellent admixtures on the hydration reactions of some binders and the resistance to the physical degradation due to the crystallization of soluble salts or the exposure to UV light and rain. Some mixes were applied also on salty masonries. Different analytical techniques (FT-IR, TG-DSC, SEM-EDX, XRD), test according to the european normative, porosimetric ultrasonic measurements and IR- thermography were used
Various approaches for the genomic analysis of the genetic structure of different cattle populations
Full text linkRuns of homozygosity (ROHom) and Runs of Heterozygosity (ROHet) are two techniques that allow the investigation of the genome and to study livestock population. Indeed, ROHom are continuous stretches of homozygous genotypes that are associated to autozygosity and to directional selection. ROHet, which are heterozygous chromosomal segments, can be due to balancing selection, where the genetic diversity is maintained via heterozygote advantage.
In the first study, genotypes from 204 different breeds raised worldwide were investigated to observe differences in ROHom between different types of cattle (taurine, indicine, or hybrids) and between different geographical areas. The results confirmed that ROHom can be used to identify genomic signatures, in this case probably related to the environmental adaptation.
In the second contribution, three different Italian dual-purpose breeds were genotyped to investigate ROHom and ROHet, and to test four different approaches for the ROHet detection, for which there is not consensus in the literature. Among the different approaches, two of them seemed to be more reliable, whereas the other two probably overestimated the number of ROHet. In general, less and shorter ROHet were found compared to ROHom. Moreover, the genes mapped inside these regions confirmed the hypothesis that ROHom are mainly linked to directional selection (i.e., production traits), and ROHet to balancing selection (e.g., environmental adaptation or fitness traits).
Finally, in the third study, the effect of genotyping density and detection parameters was studied on ROHom and ROHet calling, using genotypes of Italian Simmental cattle. The results confirmed that the detection of ROHom was more reliable as long as the chip density increases, whereas the density impact on ROHet was not clear. Again, the highlighted ROHom mapped genes mainly linked to meat production traits, whereas in the ROHet there were gene involved in reproduction traits
On the contribution of tidal floods on damp walls of Venice
No full textThe city of Venice, Italy, has historically coped with tidal flooding and is an example of a resilient system, but today the disruptive effects of relative sea level rise pose even more complex challenges. Some of the most significant damage to the city's historic architectural assets is related to the effects of salty water on masonry due to rising damp and tidal flooding. This paper evaluates the entity and distribution of rising damp in seven Venetian brick masonries by quantifying moisture content, soluble salt content, and ion distribution. The distribution is compared with previous literature data and related to tidal and meteorological data recorded prior to sampling. The results show that frequent tidal flooding exacerbates rising damp phenomena within building masonry, resulting in higher moisture contents both in height and depth. Possible future scenarios of relative sea level based on models and the effects of countermeasures such as the MOSE dam are discussed about the likely damage to masonry exposed to rising damp and tidal flooding
I reperti metallici dello scavo di Torcello: dati archeologici, indagini archeometriche e proposte per la conservazione.
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The effect of the local administration of FSH and /or Misoprostol on cervical penetration in the ewe during the peri-ovulatory period
No full textBehaviour of brick-NHL render systems in presence of NaCl solution
Full text linkDouble-layer renders were formulated for ensuring salt migration, ancient masonries conservation and environmental sustainability. Thus, natural hydraulic lime as binder and recycled aggregates from render wastes were selected. The properties were adjusted by adding an air-entraining agent in the inner layer and different percentages of water-repellent admixtures in the outer layer. The systems were applied on bricks and subjected to rising damp-evaporation cycles, for investigating their behaviour and properties in respect to NaCl migration. Mono-material prismatic render specimens were also studied. Water vapour permeability, capillary absorption, drying behaviour, compressive strength, mechanical resistance, conductivity and porosity of each formulation were evaluated. Good durability was observed whenever the render layers had different microstructure, either there was salts deposition within the lower layer,or if there was tefflorescences formation. If the layers had similar structure, deposition of salt at the brick-render interface occurred causing damages to the substrate.Se ha formulado una doble capa de revestimiento para garantizar la migración de las sales, la conservación de fábricas y mamposterías antiguas y la sostenibilidad del medio ambiente. De este modo, se seleccionó cal hidráulica natural y áridos reciclados de residuos de revestimientos. Además, se ajustaron y regularon las las propiedades mediante la adición de un agente aireante y de en la capa interna y de diferentes porcentajes de mezclas hidrorrepelentes en la capa externa. Los sistemas han sido aplicados sobre los ladrillos y sometidos a ciclos de humedad ascendente y de evaporación para investigar su comportamiento y propiedades respecto a la migración de ClNa. También se han estudiado especímenes prismáticos monomateriales de revestimiento. Para cada formulación se evaluaron la permeabilidad al vapor de agua, la absorción capilar, el comportamiento de secado, la resistencia a compresión, la conductividad y la porosidad. Cuando las capas del revestimiento presentan diferente microestructura se produce bien la deposición de sales en la capa inferior, bien transporte a la superficie y formación de eflorescencias, observando una buena durabilidad. Si las capas tienen estructura similar, se produce la deposición de sales en la interfaz ladrillo-mortero, originando daños al substrato
The pattern of cervical penetration and the effect of topical treatment with prostaglandin and/or FSH and oxytocin on the depth of cervical penetration in the ewe during the peri-ovulatory period
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