1,756 research outputs found
Epidemiology, prevention and control of oral diseases in pediatric subjects
Caries and periodontal diseases are a neglected epidemic by millions of
Italians who suffer unnecessarily from them. Both diseases are preventable
and the combination of high prevalence, high morbidity and relative inattention
from the National Health Service (NHS), makes caries and periodontal
disease a significant public health problem. In this perspective, the World
Health Organization and the University of Milan have promoted a national
epidemiological study aimed at a sample of 4, 6 and 12-years-old students
from schools in the North, Central and South of Italy. The study provides for
the administration of a questionnaire to parents and a dental examination
carried out at school by dentists trained by the WHO.
In our town the epidemiological study planning and the survey were carried
out by professors of the School of Specialization in "Pediatric Dentistry"
(Prof. G. Giuliana and Prof. G. Pizzo) supported by specialist dentists from
the same School, calibrated according to the WHO methodology.
The survey was carried out between 2017 and 2019 involving 2701 children
attending schools in the 8 districts of the town.
The parents were sent a letter which explained the nature of the survey
and contained a pre-printed form for the issue of informed consent to participate
in the survey with a questionnaire regarding the family nuclear, the
oral hygiene and eating habits of the minor and the child's previous dental
experiences.
The ICDAS (International Caries Detection and Assessment System) was
used to detect the prevalence of carious lesions. The dentist used for each
child visited a dental mirror and the CPI (Community Periodontal Index)
index for periodontal assessment.
Preliminary results showed that 25.3% of 12-years-old students had gingival
bleeding and 41.1% had tartar.
The caries index (ICDAS) shows us that as early as 4 years, 20% of children
have initial carious lesions, 37% have dentine caries and that 34.38%
have highly destructive caries.
At 12 years, 34.95% had initial carious lesions, 46% had cavities that already
affected dentin and that 42.44% had highly destructive cavities.
The exigence to implement a program of prevention / early treatment of
caries/gingivitis in pediatric subjects living in Palermo, since the first months
of child's life, was born from the data analysis. The project "Un sorriso per
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tutti i bambini", carried out at the U.O. of "Pediatric Dentistry" of Policlinico
Paolo Giaccone in Palermo, was therefore finalised in order to
1) improve efficiency and effectiveness in the promotion of the oral health
of minors, through the creation of a preventive / assistance route of significant
social health impact;
2) assess the effectiveness of the preventive methodologies adopte
Laterolateral teleradiography of the skull as a screening method for OSA/OSAS, in patients in orthodontic treatment
Aim: Obstructive sleep apnea syndrome (OSAS) is the most common
type of sleep apnea and it is caused by complete or partial obstruction of the
upper airway. Adenotonsillar hypertrophy, obesity, cranio-facial anomalies
and neuromuscular diseases are the main risk factors for the development of
OSAS in the pediatric age. Specially several studies identify the relationship
between respiratory disorders in sleep and obesity, and, in particular, between
OSAS and obesity, designing a prevalence of OSAS among obese subjects
between 14 and 78%. The diagnosis of OSAS in the child is of great importance
as it can lead to neurocognitive and behavioral complications, growth
retardation, systemic arterial hypertension, pulmonary hypertension, cardiovascular
disease and metabolism.
The WHO (World Health Organization) has established the new criteria
for the classification of Obesity on the basis of BMI and the risk of comorbidities,
identifying a moderate risk for underweight subjects, a very low risk for
normal weights and an increased risk from severe to severe for overweight
and obese individuals respectively.
According to that the aim of this study is to evaluate the correlation
between obstructive sleep apnea syndrome and cephalometric variables in
children considering age and BMI.
Materials and methods: Children aged 7–10 years and 11-14 years with
no genetic syndrome, previous otorhinolaryngologic or orthodontic therapy
treatments are being selected from our Departments of Paediatric Dentistry,
University of Palermo, and from the Department of Orthodontics, University
of Messina (Italy).
All patients so far recruited and visited for orthodontic problems were in
mixed or early permanent dentition phase, with the first upper molars fully
erupted and presented to the history of several symptoms of Osas, such
as recurring episodes of shallow or paused breathing during sleep, waking
up frequently to urinate, morning headaches, memory or learning problems
and not be able to concentrate or feeling irritable.
Dental records and lateral cephalometric radiographs were obtained for
all of the patients and than they have been subjected to paediatric, otolaryngology
and polysomnography visits.
Subject with a positive diagnosis of Osas were studied and they were
divided in group based on their BMI.
In all groups the inter-molar distance in dental records was measured, and the cephalometric traces have been calculated. As reported by the study by Galeotti et al. the cephalometric measurements analysed are S-PNS, ad1-PNS, and ad2-PNS for the nasopharynx; p-pp and pa for oropharynx; H-H’ for the Hyoid bone; SNA for the maxilla; SNB;ANB and Go-Me for the mandible;
S-Go, N-Me and P-A for facial Height; SN for cranial base; SN-MP and PP-MP for the typology, and angle ArGoMe for Growth prevision.
At the time that children are still in the way of recruitment the results may not yet be defined; however it is necessary to emphasize the importance of the study, because in the child respiratory disturbances in the sleep, and in particular the OSAS, are often underestimated, despite representing the third place between the threats of health after the smoke and the excess of weight
Robust Energy Management for Green and Survivable IP Networks
Despite the growing necessity to make Internet greener, it is worth pointing
out that energy-aware strategies to minimize network energy consumption must
not undermine the normal network operation. In particular, two very important
issues that may limit the application of green networking techniques concern,
respectively, network survivability, i.e. the network capability to react to
device failures, and robustness to traffic variations. We propose novel
modelling techniques to minimize the daily energy consumption of IP networks,
while explicitly guaranteeing, in addition to typical QoS requirements, both
network survivability and robustness to traffic variations. The impact of such
limitations on final network consumption is exhaustively investigated. Daily
traffic variations are modelled by dividing a single day into multiple time
intervals (multi-period problem), and network consumption is reduced by putting
to sleep idle line cards and chassis. To preserve network resiliency we
consider two different protection schemes, i.e. dedicated and shared
protection, according to which a backup path is assigned to each demand and a
certain amount of spare capacity has to be available on each link. Robustness
to traffic variations is provided by means of a specific modelling framework
that allows to tune the conservatism degree of the solutions and to take into
account load variations of different magnitude. Furthermore, we impose some
inter-period constraints necessary to guarantee network stability and preserve
the device lifetime. Both exact and heuristic methods are proposed.
Experimentations carried out with realistic networks operated with flow-based
routing protocols (i.e. MPLS) show that significant savings, up to 30%, can be
achieved also when both survivability and robustness are fully guaranteed
Energy management in communication networks: a journey through modelling and optimization glasses
The widespread proliferation of Internet and wireless applications has
produced a significant increase of ICT energy footprint. As a response, in the
last five years, significant efforts have been undertaken to include
energy-awareness into network management. Several green networking frameworks
have been proposed by carefully managing the network routing and the power
state of network devices.
Even though approaches proposed differ based on network technologies and
sleep modes of nodes and interfaces, they all aim at tailoring the active
network resources to the varying traffic needs in order to minimize energy
consumption. From a modeling point of view, this has several commonalities with
classical network design and routing problems, even if with different
objectives and in a dynamic context.
With most researchers focused on addressing the complex and crucial
technological aspects of green networking schemes, there has been so far little
attention on understanding the modeling similarities and differences of
proposed solutions. This paper fills the gap surveying the literature with
optimization modeling glasses, following a tutorial approach that guides
through the different components of the models with a unified symbolism. A
detailed classification of the previous work based on the modeling issues
included is also proposed
Quality and quality changes during refrigerated storage in diploid and triploid oysters from Orbetello Lagoon (Italy)
AbstractThe aim of this study was to evaluate the chemical and nutritional characteristics and quality decay during storage of diploid and triploid Pacific oysters (Crassostrea gigas) reared in Orbetello Lagoon (Grosseto, Italy), a site subject to high variations in environmental parameters. Specimens of diploid (D) and triploid (T) oysters of commercial size and similar age were sampled from an oyster farm (Soc. Coop. GIGAS) in autumn 2005 and in winter, spring and summer 2006. At each sampling date, D (n=60) and T (n=60) oysters were individually weighed, divided into 4 lots, stored under refrigerated conditions (+4°C), and analysed at different times after harvest (1, 3, 7 and 10 days). Oysters were individually weighed again at the different times, measured for maximum length, width and thickness, and opened. The weight of the soft part and shell and the volume of intervalvar liquor were recorded. pH of soft part, gill and mantle colour (CIE L*, a* and b*, Minolta Chromameter) and chemical characteris..
Advances on GRB as cosmological tools
Several interesting correlations among Gamma Ray Bursts (GRB) prompt and
afterglow properties have been found in the recent years. Some of these
correlations have been proposed also to standardize GRB energetics to use them
as standard candles in constraining the expansion history of the universe up to
z>6. However, given the still unexplained nature of most of these correlations,
only the less scattered correlations can be used for constraining the
cosmological parameters. The updated E_peak-E_gamma correlation is presented.
Caveats of alternative methods of standardizing GRB energetics are discussed.Comment: 8 parges, AIP conf. proc. "Probing stellar populations out to the
distant universe, Cefalu' 2008" Vol. 1111, pp. 579-58
Stress during slaughter increases lipid metabolites and decreases oxidative stability of farmed rainbow trout (Oncorhynchus mykiss) during frozen storage
6 páginas, 1 figura, 3 tablasThe consequences of slaughter on the formation of lipid metabolites and oxidative stability of fish muscle during long term frozen storage (−10 °C) were evaluated using farmed rainbow trout killed by asphyxia in air or percussion. The level of major adenine nucleotides and their related compounds was determined in order to check the stress level during slaughter. Plasma lipid metabolites were studied through the determination of eicosanoids and docosanoids such as prostaglandins, leukotrienes, thromboxanes, isoprostanes, resolvins, hydroxides, hydroperoxides, coming from eicosapentaenoic (EPA), arachidonic (ARA), and docosahexaenoic (DHA) acids. In addition, lipid oxidative stability of fillets was monitored. Results revealed that stress during slaughter can greatly influence oxidative stress and oxidative stability of rainbow trout fillets. In fact, asphyxia, which was the most stressful, induced a higher production of some lipid mediators such as hydroperoxides and EPA-derived prostaglandins, such as 12-HpHEPE/15-HpHEPE and PGD3/PGE3. As a consequence, fillets derived from asphyxiated fish were less stable in terms of oxidative stability and showed lower shelf-lifeThe authors gratefully acknowledge the Erasmus Placement Project for Giulia Secci’s grant, the Consejo Superior de Investigaciones CientÃficas (CSIC) for the doctoral fellowship to Gabriel Dasilva, the ASTRO Company for the project financial supporting and the Fondazione Edmund Mach for kindly providing rainbow troutPeer reviewe
Ultrastructure of pollen of Vitis vinifera L. cv. "Picolit giallo" and its behaviour in experiments of self- and cross-pollination
The ultrastructure of the pollen and stigma of Vitis vinifera L. cv. "Picolit giallo" was studied by scanning and transmission electron microscopy, with the aim of finding out if they presented abnormalities which could account far the low procluctivity of this vine variety. The pollen protoplast has a normai aspect, but its wall is continuous and does not present furrows and germinative pores as pollen grains generally do. The stigma appeared normai. The presence of an uninterrupted wall most probably constitutes an obstacle to pollen germination and is likely to be one of the causes of the low fertilization incidence of "Picolit giallo". This hypothesis is supported also by the results of the experiments of self- and cross-pollination, because Picolit pollen always failed to germinate, even if put on stigmas of other vine varieties, while the pollen of these varieties germinated regularly when put on Picolit stigmas.Die Feinstruktur der Pollenkörner von Vitis vinifera L. cv. Picolit giallo und ihrVerhalten bei Versuchen zur Selbst- und FremdbestäubungDie Vitis-vinifera-Sorte Pìcolit giallo liefert nur geringe Erträge. Um hierfür verantwortliche Abnormitäten aufzufinden, wurde die Feinstruktur von Pollenkörnern und Narbe mit Hilfe der Raster- und Transmissionselektronenmikroskopie untersucht. Der Protoplast der Pollenkörner wirkt normal, aber die Pollenwand ist von kontinuierlicher Beschaffenheit und zeigt keine Furchen oder Keimporen wie bei typischen Pollenkörnern. Die Narbe macht einen normalen Eindruck. Sehr wahrscheinlich verhindert die nicht unterbrochene Pollenwand die Pollenkeimung und ist somit eine mögliche Ursache der geringen Fertilität von Picolit giallo. Diese Vermutung wird durch Versuche zur Selbst- und Fremdbestäubung gestützt, wobei Picolit-Pollen nie keimte, auch dann nicht, wenn er auf Narben anderer Rebensorten gebracht wurde; umgekehrt keimte der Pollen solcher Sorten regelmäßig, wenn er auf Picolit-Narben übertragen wurde
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