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1.
J Clin Med ; 13(13)2024 Jul 04.
Article in English | MEDLINE | ID: mdl-38999502

ABSTRACT

Introduction: The aim of this study was to evaluate the age at onset, clinical course, and patterns of left ventricular (LV) remodelling during follow-up in children and young patients with hypertrophic cardiomyopathy (HCM). Methods: We included consecutive patients with sarcomeric or non-syndromic HCM below 18 years old. Three pre-specified patterns of LV remodelling were assessed: maximal LV wall thickness (MLVWT) thickening; MLVWT thinning with preserved LV ejection fraction; and MLVWT thinning with progressive reduction in LV ejection fraction (hypokinetic end-stage evolution). Results: Fifty-three patients with sarcomeric/non-syndromic HCM (mean age 9.4 ± 5.5 years, 68% male) fulfilled the inclusion criteria. In total, 32 patients (60%) showed LV remodelling: 3 patients (6%) exhibited MLVWT thinning; 16 patients (30%) showed MLVWT thickening; and 13 patients (24%) progressed to hypokinetic end-stage HCM. Twenty-one patients (40%) had no LV remodelling during follow-up. In multivariate analysis, MLVWT was a predictor of the hypokinetic end-stage remodelling pattern during follow-up (OR 1.17 [95%CI 1.01-1.36] per 1 mm increase, p-value 0.043), regardless of sarcomeric variants and New York Heart Association class. Two patients with sarcomeric HCM, showing a pattern of MLVWT regression during childhood, experienced progression during adolescence. Conclusions: Different patterns of LV remodelling were observed in a cohort of children with sarcomeric/non-syndromic HCM. Interestingly, a pattern of progressive MLVWT thinning during childhood, with new progression of MLVWT during adolescence, was noted. A better understanding of the remodelling mechanisms in children with sarcomeric HCM may be relevant to defining the timing and possible efficacy of new targeted therapies in the preclinical stage of the disease.

2.
Nutrients ; 16(2)2024 Jan 22.
Article in English | MEDLINE | ID: mdl-38276561

ABSTRACT

Different studies and systematic reviews have reported weight increase after tonsillectomy. However, the odds of a child being overweight or obese after tonsillectomy were no different than before surgery, according to a few studies. This systematic review aims to analyze the impact of adenotonsillectomy (TA) on weight gain and identify subgroups of children and adolescents at risk of experiencing weight gain. A systematic search included studies published in the last ten years. The PICO framework was used in the selection process, and evidence was assessed using the GRADE system. A total of 26 studies were included, and moderate-high level quality ones showed that children who underwent TA could present an increase in BMI z-score. However, this weight gain was significant in individuals younger than six years old and was considered catch-up growth in underweight subjects at baseline. In contrast, for normal-weight or overweight individuals, TA did not lead to overweight per se. At the same time, diet changes and overfeeding did not have a leading role in weight gain. In conclusion, TA may not be an independent risk factor for unfavorable weight gain in children; however, individuals who were underweight pre-operatively or younger than six years reported more weight gain after TA than expected.


Subject(s)
Overweight , Tonsillectomy , Child , Adolescent , Humans , Tonsillectomy/adverse effects , Thinness , Body Mass Index , Weight Gain
3.
Diagnostics (Basel) ; 14(1)2024 Jan 04.
Article in English | MEDLINE | ID: mdl-38201424

ABSTRACT

Left ventricular non-compaction (LVNC) is a heterogeneous myocardial disorder characterized by prominent trabeculae protruding into the left ventricular lumen and deep intertrabecular recesses. LVNC can manifest in isolation or alongside other heart muscle diseases. Its occurrence among children is rising due to advancements in imaging techniques. The origins of LVNC are diverse, involving both genetic and acquired forms. The clinical manifestation varies greatly, with some cases presenting no symptoms, while others typically manifesting with heart failure, systemic embolism, and arrhythmias. Diagnosis mainly relies on assessing heart structure using imaging tools like echocardiography and cardiac magnetic resonance. However, the absence of a universally agreed-upon standard and limitations in diagnostic criteria have led to ongoing debates in the scientific community regarding the most reliable methods. Further research is crucial to enhance the diagnosis of LVNC, particularly in early life stages.

4.
Vaccine ; 42(2): 287-294, 2024 Jan 12.
Article in English | MEDLINE | ID: mdl-38072758

ABSTRACT

INTRODUCTION: In Italy Rotavirus vaccination (RVV) is provided free of charge from 2018, however, the coverage is scattered and suboptimal. The narrow time frame to complete the schedule is a barrier to uptake, and co-administration with other vaccines may potentially increase the coverage. Although the co-administration of RV vaccine and Meningococcal Group B vaccine (MenB) is not included in the product labels, we aimed at studying its impact on RVV coverage. METHODS: This Surveillance study on Timing and cOverage of Rotavirus and MenB vaccine co-administration (STORM study) used the Regional Vaccination Registry to collect data about children born in Campania Region between January 2016 and December 2020, and receiving vaccines scheduled in the first year of life. RESULTS: Among the 224,110 children enrolled, 60,614 (27.0%) completed the RVV schedule, with a vaccination rate that increased over time from 1.15% in 2016 to 56.92% in 2020. The first and last dose of RVV schedule were administered beyond the recommended time in 6% of the study population, respectively. Co-administration of RV vaccine with MenB vaccine increased from 0.7 % in 2016 to 46.85 % in 2020. Children receiving RV/MenB vaccines concomitantly had a significantly higher chance of completing the RV schedule compared to those receiving RVV alone during a specific appointment (94.78 % vs 72.26 %, Prevalence Ratio -PR- 1.275, 95 %CI 1.245-1.295p < 0.00001). The positive driving effect of RV/MenB co-administration was more evident for children receiving pentavalent (PR 1.288) than monovalent RVV (PR 1.115) which was confirmed when adjusted for confounding variables (i.e., year of vaccination, local district, gender). CONCLUSIONS: Although still far from the target, RVV coverage has increased in recent years in Campania Region. Co-administration with MenB vaccine may aid in increasing RVV coverage, especially for pentavalent RVV. Further safety data are needed to support co-administration as a key tool to increase coverage.


Subject(s)
Meningococcal Vaccines , Rotavirus Infections , Rotavirus Vaccines , Rotavirus , Male , Child , Humans , Infant , Vaccination Coverage , Retrospective Studies , Vaccination , Rotavirus Infections/prevention & control , Rotavirus Infections/epidemiology
5.
Epidemiol Prev ; 47(4-5): 263-272, 2023.
Article in English | MEDLINE | ID: mdl-37846449

ABSTRACT

OBJECTIVES: to describe the monthly trend of breastfeeding during hospitalization and the presence of companion of woman's choice during labour and birth, and the key regional responders' perspective of homogeneity/heterogeneity of the presence of the support person, before, during (February-May 2020), and after the first COVID-19 pandemic wave in a few Italian Regions. DESIGN: two-phase study. SETTING AND PARTICIPANTS: data from the italian birth certificate of six Italian Regions between 01.01.2019 and 31.03.2021 were analysed. Semi-structured interviews were conducted with the key regional respondents. MAIN OUTCOME MEASURES: the frequency distributions of breastfeeding and the presence of companion of woman's choice were calculated as a whole and for each Region. RESULTS: the infant feeding practices experienced smaller changes during COVID-19 pandemic than the presence of the companion of woman's choice during labour and birth, from January 2019 to March 2021. The highest value of exclusive breastfeeding was recorded in September 2020 (72.1%; 95%CI 71.3-72.8) in all Regions, while the lowest was recorded in March 2021 (62.5%; 95%CI 61.5-63.4). The presence of companion of woman's choice during labour and birth decreased during the pandemic and did not return to pre-pandemic levels. The highest value of presence of father during birth was recorded in March 2019 (59.0%; 95%CI 58.2-59.8), while the lowest in April 2020 (50.0%; 95%CI 49.1-50.8). The main emerging themes were: the existence of national, regional and local indications; the facilitators (e.g., Baby-Friendly Hospital Initiative implementation, strong motivation of the staff) and the critical points (e.g., inadequate analysis of the clinical-epidemiological context, inhomogeneous indications) of management of the support person presence. CONCLUSIONS: the emergency has changed the provision of health services that not always guaranteed the application of best practices. It would be desirable to work for assessing the appropriateness of the birth certificate data to collect more accurate information and to provide clinical recommendations.


Subject(s)
Breast Feeding , COVID-19 , Infant , Infant, Newborn , Female , Humans , Pandemics , Italy/epidemiology , COVID-19/epidemiology , Feeding Behavior
6.
Vaccines (Basel) ; 11(9)2023 Aug 24.
Article in English | MEDLINE | ID: mdl-37766089

ABSTRACT

With the progressive lengthening of the average age of the population, especially in some countries such as Italy, vaccination of the elderly is a fixed point on which most of the public health efforts are concentrating as epidemic infectious diseases, especially those of the winter, have a major impact on the progression of severe disease, hospitalization, and death. The protection of the elderly against acute infectious diseases should not only limit mortality but also have a positive impact on the fragility of these people in terms of less disability and fewer care needs. However, vaccination of the elderly population differs in efficacy and safety compared to that of other population categories since aging and the consequent loss of efficiency of the immune system lead to a reduction in the immunogenicity of vaccines without achieving a lasting antibody coverage. There are various strategies to avoid the failure of immunization by vaccines such as resorting to supplementary doses with adjuvant vaccines, increasing the dosage of the antigen used, or choosing to inoculate the serum relying on various routes of administration of the vaccine. Vaccination in the elderly is also an important factor in light of growing antibiotic resistance because it can indirectly contribute to combating antibiotic resistance, reducing theoretically the use of those agents. Furthermore, vaccination in old age reduces mortality from infectious diseases preventable with vaccines and reduces the same rate of resistance to antibiotics. Given the importance and complexity of the topic, in this review, we will deal with the main aspects of vaccination in the elderly and how it can influence mortality and healthcare costs, especially in those countries where population aging is more evident. Therefore, we conducted a systematic literature search in PubMed to identify all types of studies published up to 31 May 2023 that examined the association between vaccination and the elderly. Data extraction and quality assessment were conducted by two reviewers (PC and TC) who independently extracted the following data and assessed the quality of each study.

7.
BJOG ; 2022 Oct 09.
Article in English | MEDLINE | ID: mdl-36209471

ABSTRACT

OBJECTIVE: To compare the estimates of preterm birth (PTB; 22-36 weeks gestational age, GA) and stillbirth rates during COVID-19 pandemic in Italy with those recorded in the three previous years. DESIGN: A population-based cohort study of liveborn and stillborn infants was conducted using data from Regional Health Systems and comparing the pandemic period (March 1st , 2020-March 31st , 2021, N= 362,129) to an historical period (January 2017- February 2020, N=1,117,172). The cohort covered 84.3% of the births in Italy. METHODS: Poisson regressions were run in each Region and meta-analyses were performed centrally. We used an interrupted time series regression analysis to study the trend of preterm births from 2017 to 2021. MAIN OUTCOME MEASURES: The primary outcomes were PTB and stillbirths. Secondary outcomes were late PTB (32-36 weeks' GA), very PTB (<32 weeks' GA), and extremely PTB (<28 weeks' GA), overall and stratified into singleton and multiples. RESULTS: The pandemic period compared with the historical one was associated with a reduced risk for PTB (Risk Ratio: 0.91; 95% Confidence Interval, CI: 0.88, 0.93), late PTB (0.91; 0.88, 0.94), very PTB (0.88; 0.84, 0.91), and extremely PTB (0.88; 0.82, 0.95). In multiples, point estimates were not very different, but had wider CIs. No association was found for stillbirths (1.01; 0.90, 1.13). A linear decreasing trend in PTB rate was present in the historical period, with a further reduction after the lockdown. CONCLUSIONS: We demonstrated a decrease in PTB rate after the introduction of COVID-19 restriction measures, without an increase in stillbirths.

8.
Front Public Health ; 9: 658959, 2021.
Article in English | MEDLINE | ID: mdl-34046390

ABSTRACT

This article describes how innovations are exploited in Campania (Italy) to improve health outcomes, quality of life, and sustainability of social and healthcare services. Campania's strategy for digitalization of health and care and for healthy aging is based on a person-centered, life-course, "One Health" approach, where demographic change is considered capable of stimulating a growth dynamic linked to the opportunities of combining the "Silver Economy" with local assets and the specific health needs of the population. The end-users (citizens, patients, and professionals) contribute to the co-creation of products and services, being involved in the identification of unmet needs and test-bed activity. The Campania Reference Site of the European Innovation Partnership on Active and Healthy Aging is a flexible regional ecosystem to address the challenge of an aging population with a life-course approach. The good practices, developed in the context of research and innovation projects and innovative procurements by local stakeholders and collaborations with international networks, have been allowing the transfer of innovative solutions, knowledge, and skills to the stakeholders of such a multi-sectoral ecosystem for health.


Subject(s)
Healthy Aging , Quality of Life , Aged , Aging , Ecosystem , Humans , Italy
9.
Ital J Pediatr ; 46(1): 131, 2020 Sep 14.
Article in English | MEDLINE | ID: mdl-32928245

ABSTRACT

BACKGROUND: Congenital Hyperinsulinism typically occurs with a neonatal hypoglycemia but can appear even in childhood or in adolescence with different types of glucose metabolism derangements. Current diagnostic algorithms don't take into account cases with a late presentation. PATIENTS AND METHODS: Clinical and laboratory data of twenty-two subjects diagnosed at Federico II University of Naples have been described: patients have been divided according to the molecular defect into channel defects, metabolic defects and unidentified molecular defects. A particular focus has been made on three cases with a late presentation. RESULTS AND CONCLUSIONS: Late presentation cases may not be identified by previous diagnostic algorithms. Consequently, it seems appropriate to design a new flow-chart starting from the age of presentation, also considering that late presentation cases can show glucose metabolism derangements other than hypoglycaemic crises such as diabetes, glucose intolerance, postprandial hypoglycaemia and gestational diabetes.


Subject(s)
Congenital Hyperinsulinism/diagnosis , Adolescent , Age Factors , Algorithms , Child , Cohort Studies , Congenital Hyperinsulinism/complications , Congenital Hyperinsulinism/genetics , Female , Humans , Italy , Male
10.
Phys Rev E ; 98(1-1): 012203, 2018 Jul.
Article in English | MEDLINE | ID: mdl-30110752

ABSTRACT

Precise time dissemination and synchronization have been some of the most important technological tasks for several centuries. Since the early 1800s, it was realized that precise time-keeping devices having the same stable frequency and precisely synchronized can have important applications in navigation. In modern times, satellite-based global positioning and navigation systems such as the GPS use the same principle. However, even the most sophisticated satellite navigation equipment cannot operate in every environment. In response to this need, we present a computational and analytical study of a network-based model of a high-precision, inexpensive, coupled crystal oscillator system and timing (CCOST) device. A bifurcation analysis (carried out by the authors in a related publication) [Buono et al., SIAM J. Appl. Dyn. Syst. 17, 1310 (2018)1536-004010.1137/16M1066154] of the network dynamics shows a wide variety of collective patterns, mainly various forms of discrete rotating waves and synchronization patterns. Results from computer simulations seem to indicate that, among all patterns, the standard traveling wave pattern in which consecutive crystals oscillate out of phase by 2π/N, where N is the network size, leads to phase drift error that decreases as 1/N as opposed to 1/sqrt[N] for an uncoupled ensemble. The results should provide guidelines for future experiments, design, and fabrication tasks.

11.
ChemSusChem ; 11(15): 2472-2491, 2018 Aug 09.
Article in English | MEDLINE | ID: mdl-29862669

ABSTRACT

Lignin, tannins, and cashew nut shell liquid are considered the main sources of aromatic-based macromolecules. They represent an abundant alternative feedstock for the elaboration of aromatic chemicals and polymers, with a view to replacing some fossil-based fractions. Located in different tissues of plants, these compounds, with a large diversity and structural complexity, have, to date, been considered as byproducts derived from fractionation-separation industrial processes with low added value. In the last decade, the use of click chemistry as a tool for the synthesis of controlled macromolecular architectures has seen much development in fundamental and applied research for a wide range of applications. It could represent a valid solution to overcome the main limitations encountered in the chemical modification of natural sources of chemicals, with an environmentally friendly approach to create new substrates for the development of innovative polymers and materials. After a brief description of the main aromatic biopolymers, including the main extraction techniques, along with their structure and their properties, this Review describes chemical modifications that have mainly been focused on natural polyphenols, with the aim of introducing clickable groups, and their further use for the synthesis of biobased materials and additives. Special emphasis is given to several as-yet unexplored chemical features that could contribute to further fundamental and applied materials science research.

12.
Math Biosci ; 289: 96-115, 2017 07.
Article in English | MEDLINE | ID: mdl-28511959

ABSTRACT

The growth and invasion of cancer cells are very complex processes, which can be regulated by the cross-talk between various signalling pathways, or by single signalling pathways that can control multiple aspects of cell behaviour. TGF-ß is one of the most investigated signalling pathways in oncology, since it can regulate multiple aspects of cell behaviour: cell proliferation and apoptosis, cell-cell adhesion and epithelial-to-mesenchimal transition via loss of cell adhesion. In this study, we use a mathematical modelling approach to investigate the complex roles of TGF-ß signalling pathways on the inhibition and growth of tumours, as well as on the epithelial-to-mesenchimal transition involved in the metastasis of tumour cells. We show that the nonlocal mathematical model derived here to describe repulsive and adhesive cell-cell interactions can explain the formation of new tumour cell aggregations at positions in space that are further away from the main aggregation. Moreover, we show that the increase in cell-cell adhesion leads to fewer but larger aggregations, and the increase in TGF-ß molecules - whose late-stage effect is to decrease cell adhesion - leads to many small cellular aggregations. Finally, we perform a sensitivity analysis on some parameters associated with TGF-ß dynamics, and use it to investigate the relation between the tumour size and its metastatic spread.


Subject(s)
Cell Adhesion , Models, Biological , Neoplasms/metabolism , Neoplasms/pathology , Signal Transduction , Transforming Growth Factor beta/metabolism , Animals , Cell Aggregation , Cell Proliferation , Epithelial-Mesenchymal Transition , Humans , Mice , Neoplasm Metastasis/pathology , Pattern Recognition, Automated , Tumor Burden
13.
ChemSusChem ; 10(5): 984-992, 2017 03 09.
Article in English | MEDLINE | ID: mdl-28042912

ABSTRACT

In the present report an environmentally friendly approach to transforming renewable feedstocks into value-added materials is proposed. This transformation pathway was conducted under green conditions, without the use of solvents or catalyst. First, controlled modification of lignin, a major biopolymer present in wood and plants, was achieved by esterification with 11-maleimidoundecylenic acid (11-MUA), a derivative from castor oil that contains maleimide groups, following its transformation into 11-maleimidoundecanoyl chloride (11-MUC). Different degrees of substitution were achieved by using various amounts of the 11-MUC, leading to an efficient conversion of lignin hydroxy groups, as demonstrated by 1 H and 31 P NMR analyses. These fully biobased maleimide-lignin derivatives were subjected to an extremely fast (ca. 1 min) thiol-ene "click" polymerization with thiol-containing linkers. Aliphatic and aromatic thiol linkers bearing two to four thiol groups were used to tune the reactivity and crosslink density. The properties of the resulting materials were evaluated by swelling tests and thermal and mechanical analyses, which showed that varying the degree of functionality of the linker and the linker structure allowed accurate tailoring of the thermal and mechanical properties of the final materials, thus providing interesting perspectives for lignin in functional aromatic polymers.


Subject(s)
Lignin/chemistry , Maleimides/chemistry , Polymerization , Sulfhydryl Compounds/chemistry , Click Chemistry , Mechanical Phenomena , Temperature
14.
Sci Rep ; 6: 38844, 2016 12 19.
Article in English | MEDLINE | ID: mdl-27991500

ABSTRACT

This longitudinal population-based study analyses the frequency of diabetic ketoacidosis (DKA) at type 1 diabetes diagnosis in Italian children under 15 years of age, during 2004-2013. DKA was defined as absent (pH ≥ 7.30), mild/moderate (7.1 ≤ pH < 7.30) and severe (pH < 7.1). Two multiple logistic regression models were used to evaluate the time trend of DKA frequency considered as present versus absent and severe versus absent, adjusted for gender, age group and geographical area of residence at diagnosis. Overall, 9,040 cases were ascertained. DKA frequency was 40.3% (95%CI: 39.3-41.4%), with 29.1% and 11.2% for mild/moderate and severe DKA, respectively. Severe DKA increased significantly during the period (OR = 1.03, 95%CI: 1.003-1.05). Younger-age children and children living in Southern Italy compared to Central Italy were at significantly higher risk of DKA and severe DKA. Family history of type 1 diabetes and residence in Sardinia compared to Central Italy were significantly associated with a lower probability of DKA and severe DKA. The high frequency of ketoacidosis in Italy over time and high variability among age groups and geographical area of residence, strongly suggests a continuing need for nationwide healthcare strategies to increase awareness of early detection of diabetes.


Subject(s)
Diabetes Mellitus, Type 1/epidemiology , Diabetic Ketoacidosis/epidemiology , Adolescent , Age Factors , Diabetes Mellitus, Type 1/diagnosis , Diabetic Ketoacidosis/diagnosis , Female , Humans , Italy/epidemiology , Longitudinal Studies , Male
15.
J Diabetes Res ; 2016: 5719470, 2016.
Article in English | MEDLINE | ID: mdl-26649321

ABSTRACT

We conducted a retrospective survey in pediatric centers belonging to the Italian Society for Pediatric Diabetology and Endocrinology. The following data were collected for all new-onset diabetes patients aged 0-18 years: DKA (pH < 7.30), severe DKA (pH < 7.1), DKA in preschool children, DKA treatment according to ISPAD protocol, type of rehydrating solution used, bicarbonates use, and amount of insulin infused. Records (n = 2453) of children with newly diagnosed diabetes were collected from 68/77 centers (87%), 39 of which are tertiary referral centers, the majority of whom (n = 1536, 89.4%) were diagnosed in the tertiary referral centers. DKA was observed in 38.5% and severe DKA in 10.3%. Considering preschool children, DKA was observed in 72%, and severe DKA in 16.7%. Cerebral edema following DKA treatment was observed in 5 (0.5%). DKA treatment according to ISPAD guidelines was adopted in 68% of the centers. In the first 2 hours, rehydration was started with normal saline in all centers, but with different amount. Bicarbonate was quite never been used. Insulin was infused starting from third hour at the rate of 0.05-0.1 U/kg/h in 72% of centers. Despite prevention campaign, DKA is still observed in Italian children at onset, with significant variability in DKA treatment, underlying the need to share guidelines among centers.


Subject(s)
Diabetes Mellitus, Type 1/complications , Diabetic Ketoacidosis/drug therapy , Insulin/therapeutic use , Adolescent , Child , Child, Preschool , Diabetes Mellitus, Type 1/drug therapy , Female , Health Care Surveys , Humans , Infant , Infant, Newborn , Italy , Male , Rehydration Solutions , Retrospective Studies , Treatment Outcome
16.
Horm Res Paediatr ; 84(2): 139-44, 2015.
Article in English | MEDLINE | ID: mdl-26138370

ABSTRACT

Diabetic ketoacidosis (DKA) may be associated with neurologic complications: the most common is cerebral edema while the risk of venous and arterial stroke is rare. There is a pathogenetic link between DKA, hypercoagulability and stroke, whose risk is underestimated by clinicians. Our cases present a wide spectrum of cerebral accidents during DKA, the first one being diffuse cerebral edema, the second one venous stroke after 5 days of DKA resolution, while the third one multifocal edema suspected to be extrapontine myelinolysis although without electrolyte imbalance. Our cases suggest that DKA requires very accurate treatment, particularly at an early age, and it can be complicated by cerebral accidents even with appropriate medical care.


Subject(s)
Diabetic Ketoacidosis/complications , Stroke/etiology , Brain Edema/etiology , Child , Diabetic Ketoacidosis/drug therapy , Disease Progression , Female , Fluid Therapy , Humans , Infant , Magnetic Resonance Imaging , Male , Treatment Outcome
17.
Proc Biol Sci ; 282(1812): 20150973, 2015 Aug 07.
Article in English | MEDLINE | ID: mdl-26224710

ABSTRACT

Trophic interactions in multiprey systems can be largely determined by prey distributions. Yet, classic predator-prey models assume spatially homogeneous interactions between predators and prey. We developed a spatially informed theory that predicts how habitat heterogeneity alters the landscape-scale distribution of mortality risk of prey from predation, and hence the nature of predator interactions in multiprey systems. The theoretical model is a spatially explicit, multiprey functional response in which species-specific advection-diffusion models account for the response of individual prey to habitat edges. The model demonstrates that distinct responses of alternative prey species can alter the consequences of conspecific aggregation, from increasing safety to increasing predation risk. Observations of threatened boreal caribou, moose and grey wolf interacting over 378 181 km(2) of human-managed boreal forest support this principle. This empirically supported theory demonstrates how distinct responses of apparent competitors to landscape heterogeneity, including to human disturbances, can reverse density dependence in fitness correlates.


Subject(s)
Deer/physiology , Food Chain , Predatory Behavior , Wolves/physiology , Animals , Canada , Models, Biological , Reindeer/physiology
18.
J Math Biol ; 71(4): 847-81, 2015 Oct.
Article in English | MEDLINE | ID: mdl-25315439

ABSTRACT

The study of self-organised collective animal behaviour, such as swarms of insects or schools of fish, has become over the last decade a very active research area in mathematical biology. Parabolic and hyperbolic models have been used intensively to describe the formation and movement of various aggregative behaviours. While both types of models can exhibit aggregation-type patterns, studies on hyperbolic models suggest that these models can display a larger variety of spatial and spatio-temporal patterns compared to their parabolic counterparts. Here we use stability, symmetry and bifurcation theory to investigate this observation more rigorously, an approach not attempted before to compare and contrast aggregation patterns in models for collective animal behaviors. To this end, we consider a class of nonlocal hyperbolic models for self-organised aggregations that incorporate various inter-individual communication mechanisms, and take the formal parabolic limit to transform them into nonlocal parabolic models. We then discuss the symmetry of these nonlocal hyperbolic and parabolic models, and the types of bifurcations present or lost when taking the parabolic limit. We show that the parabolic limit leads to a homogenisation of the inter-individual communication, and to a loss of bifurcation dynamics (in particular loss of Hopf bifurcations). This explains the less rich patterns exhibited by the nonlocal parabolic models. However, for multiple interacting populations, by breaking the population interchange symmetry of the model, one can preserve the Hopf bifurcations that lead to the formation of complex spatio-temporal patterns that describe moving aggregations.


Subject(s)
Behavior, Animal , Models, Biological , Animal Communication , Animal Migration , Animals , Computer Simulation , Mathematical Concepts , Pattern Recognition, Automated/statistics & numerical data , Population Dynamics
19.
BMC Med Genet ; 15: 88, 2014 Jul 24.
Article in English | MEDLINE | ID: mdl-25056293

ABSTRACT

BACKGROUND: Wolfram Syndrome type 2 (WFS2) is considered a phenotypic and genotypic variant of WFS, whose minimal criteria for diagnosis are diabetes mellitus and optic atrophy. The disease gene for WFS2 is CISD2. The clinical phenotype of WFS2 differs from WFS1 for the absence of diabetes insipidus and psychiatric disorders, and for the presence of bleeding upper intestinal ulcers and defective platelet aggregation. After the first report of consanguineous Jordanian patients, no further cases of WFS2 have been reported worldwide. We describe the first Caucasian patient affected by WFS2. CASE PRESENTATION: The proband was a 17 year-old girl. She presented diabetes mellitus, optic neuropathy, intestinal ulcers, sensorineural hearing loss, and defective platelet aggregation to ADP. Genetic testing showed a novel homozygous intragenic deletion of CISD2 in the proband. Her brother and parents carried the heterozygous mutation and were apparently healthy, although they showed subclinical defective platelet aggregation. Long runs of homozygosity analysis from SNP-array data did not show any degree of parental relationship, but the microsatellite analysis confirmed the hypothesis of a common ancestor. CONCLUSION: Our patient does not show optic atrophy, one of the main diagnostic criteria for WFS, but optic neuropathy. Since the "asymptomatic" optic atrophy described in Jordanian patients is not completely supported, we could suppose that the ocular pathology in Jordanian patients was probably optic neuropathy and not optic atrophy. Therefore, as optic atrophy is required as main diagnostic criteria of WFS, it might be that the so-called WFS2 could not be a subtype of WFS. In addition, we found an impaired aggregation to ADP and not to collagen as previously reported, thus it is possible that different experimental conditions or inter-patient variability can explain different results in platelet aggregation. Further clinical reports are necessary to better define the clinical spectrum of this syndrome and to re-evaluate its classification.


Subject(s)
Aging, Premature/genetics , Hearing Loss, Sensorineural/genetics , Membrane Proteins/genetics , Mitochondrial Diseases/genetics , Optic Atrophy/genetics , Optic Nerve Diseases/genetics , Platelet Aggregation/genetics , Sequence Deletion , Adolescent , Exons , Female , Humans
20.
Acta Diabetol ; 51(2): 173-84, 2014 Apr.
Article in English | MEDLINE | ID: mdl-24162715

ABSTRACT

A panel of experts of the Italian Society of Pediatric Endocrinology and Diabetology comprehensively discussed and approved the Italian recommendations regarding self-monitoring of blood glucose, continuous glucose monitoring and other measures of glycemic control in children and adolescents with type 1 diabetes. After an extensive review of the literature, we took these issues into account: self-monitoring blood glucose, continuous glucose monitoring, glycemic variability, glycosuria, ketonuria, ketonemia, glycated hemoglobin, fructosamine and glycated albumin, logbook, data downloading, lancing devices, carbohydrate counting, and glycemic measurements at school. We concluded that clinical guidelines on self-management should be developed in every country with faithful adaptation to local languages and taking into account specific contexts and local peculiarities, without any substantial modifications to the international recommendations. We believe that the National Health Service should provide all necessary resources to ensure self-monitoring of blood glucose and possibly continuous glucose monitoring of all children and adolescents with type 1 diabetes, according to the standards of care provided by these recommendations and internationally.


Subject(s)
Blood Glucose Self-Monitoring/methods , Blood Glucose/metabolism , Diabetes Mellitus, Type 1/metabolism , Adolescent , Blood Glucose Self-Monitoring/instrumentation , Blood Glucose Self-Monitoring/standards , Child , Consensus , Diabetes Mellitus, Type 1/drug therapy , Glycated Hemoglobin/analysis , Humans , Insulin/administration & dosage
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