Search results for " deterioration"

Characterization in the archaeological excavation site of heterotrophic bacteria and fungi of deteriorated wall painting of Herculaneum in Italy

2011

Microbiological characterization of frescos in four different locations (Collegio degli Augustali, Casa del Colonnato Tuscanico, Casa dello Scheletro and Casa del Gran Portale) of excavation sites of Herculaneum was carried out. The use of infrared thermography allowed detecting sample points on frescos with greatest moisture not visible to the naked eye, resulting in structural damage. The microclimatic conditions provided perfect habitat for bacteria and fungi, particularly of spore forming and mould. In fact, heterotrophic bacteria were prevalent in all wall paintings monitored (ranging from 18 +/- 2 CFU 100 cm(-2) to 68 +/- 4 CFU 100 cm(-2)), whereas fungi were also detected but at lowe…

Enablers of the successful implementation of simulation exercises: a qualitative study among nurse teachers in undergraduate nursing education

2021

Abstract Background Simulation exercises are increasingly being used as a teaching method in the field of undergraduate nursing education. Thus, the present study sought to identify, describe and discuss enablers of the successful implementation of simulation exercises in undergraduate nursing education. Methods This study had a qualitative descriptive design and involved individual interviews conducted between November and December 2018 with six nurse teachers from three different university campuses in Norway. The transcribed interviews were analysed by means of a qualitative thematic analysis. Results The majority of the interviewees wanted to offer more simulation exercises as part of t…

Centenarians in Western Sicily

1998

Progressive aging of general population recorded in Italy has caused an increase of the number of centenarians. Such high age is often associated with failure of many psychic and physical functions, and centenarians are therefore often not independent (partially or completely) and require particular care.

ARTIFICIAL STONE IN ARCHITECTURE: NEW TECHNIQUES OF INTERVENTION IN THE UTVEGGIO CASTLE IN PALERMO

2011

The development of new techniques and instruments for use in the field of the preservation, conservation and valorisation of Cultural Heritage is in continuous growth. This is evident in the many valuable scientific and technological improvements being implemented through projects financed by research institutions, universities and private companies. To make this renewed progress effective however, it is necessary to promote the creation of interdisciplinary research teams with different skills, to carry out new experiments and to define new methodologies and protocols.

Frammenti di mosaico riportati su calcestruzzo:le interazioni con il supporto e il progetto di conservazione

2010

Surface AFM microscopy of unworn and worn samples of silicone hydrogel contact lenses

2008

Abstract: Purpose. To evaluate the qualitative and quantitative topographic changes in the surface of worn contact lenses (CLs) of different materials using atomic force microscopy (AFM). Methods. The topography of five different CL materials was evaluated withAFM over a surface of 25 lm2 according to previously published experimental setup. Average roughness (Ra) and root mean square (Rms) values were obtained for unworn and worn samples. Results. The Ra value increased for balafilcon A (11.62–13.68 nm for unworn and worn samples, respectively), lotrafilcon A (3.67–15.01 nm for unworn and worn samples, respectively), lotrafilcon B (4.08–8.42 nm for unworn and worn samples, respectively), g…

A Comprehensive Review on Lipid Oxidation in Meat and Meat Products.

2019

Meat and meat products are a fundamental part of the human diet. The protein and vitamin content, as well as essential fatty acids, gives them an appropriate composition to complete the nutritional requirements. However, meat constituents are susceptible to degradation processes. Among them, the most important, after microbial deterioration, are oxidative processes, which affect lipids, pigments, proteins and vitamins. During these reactions a sensory degradation of the product occurs, causing consumer rejection. In addition, there is a nutritional loss that leads to the formation of toxic substances, so the control of oxidative processes is of vital importance for the meat industry. Noneth…

Identification of the pathogens responsible for the surface deteriorations on the potato tubers

2007

Catacomba di Villagrazia di Carini. La galleria XII: indagini archeologiche e problemi della conservazione

2017

The archaeological research in the southeastern area of the Early Christian catacombs of Villagrazia di Carini has been ongoing since 2000 to the present, but in 2014 the structural problems occurred during the excavation of the cubicles X13 and X15 have showed that this sector of the cemetery was cut into a tuff stone bench less compact and durable than the rest of the catacomb. Similarly, the excavation in the corridor XII has provided new informations about the serious effects of the physico-chemical changes that occurred here, over the centuries, by the action of the environmental factors and the continued infiltrations of water from the above ground. The risk of a collapse that would m…

Decay assessment of stone-built cultural heritage: The case study of the cosenza cathedral façade (south calabria, italy)

2021

This study aims to assess the different decay phenomena affecting the Cosenza Cathedral façade (Calabria, South Italy) through the evaluation of the relative damage indices. For this goal, a multidisciplinary approach was applied exploiting both nondestructive and microdestructive techniques. Such a combination enabled proposing an intervention priority scale that can be helpful to institutions when planning a prompt restoration intervention. The results suggest the efficiency of this approach to obtain a multidisciplinary diagnostic and conservation system for the management and valorization of the Cultural Heritage also in terms of monitoring, maintenance, and selection of the most suitab…