scholarly journals On a System Modelling a Population with Two Age Groups

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Hongliang Gao ◽  
Ruyun Ma
Keyword(s):  
Differential Equations ◽  
Principal Eigenvalue ◽  
Linear Part ◽  
Age Groups ◽  
System Modelling ◽  
Adult Age ◽  
First Order ◽  
Existence And Nonexistence ◽  
Linearized System ◽  
Two Age Groups

A system of first order ordinary differential equations describing a population divided into juvenile and adult age groups is studied. The system is not cooperative but its linear part is, and this makes it possible to establish the existence and nonexistence results of positive solutions for the system in terms of the principal eigenvalue of the corresponding linearized system.

scholarly journals Existence of Positive Solutions for Second-Order Neumann Difference System

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Yanqiong Lu ◽  
Ruyun Ma
Keyword(s):  
Positive Solutions ◽  
Principal Eigenvalue ◽  
Linear Part ◽  
Second Order ◽  
Difference System ◽  
Nonnegative Solutions ◽  
Existence Of Positive Solutions ◽  
Existence And Nonexistence ◽  
Linearized System

This paper studies a class of Neumann difference system which is not cooperative but its linear part is and this makes it possible to establish existence and nonexistence results for nonnegative solutions of the system in terms of the principal eigenvalue of the corresponding linearized system.

scholarly journals Method of Lower and Upper Solutions for Elliptic Systems with Nonlinear Boundary Condition and Its Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Ruyun Ma ◽  
Ruipeng Chen ◽  
Yanqiong Lu
Keyword(s):  
Nonlinear Boundary ◽  
System Modeling ◽  
Principal Eigenvalue ◽  
Age Groups ◽  
Sufficient Conditions ◽  
Elliptic Systems ◽  
Nonlinear Boundary Conditions ◽  
Lower And Upper Solutions ◽  
Adult Age ◽  
Adult Model

We develop the method of lower and upper solutions for a class of elliptic systems with nonlinear boundary conditions. As its application, an elliptic system modeling a population divided into juvenile and adult age groups is studied, and we find sufficient conditions in terms of the principal eigenvalue of the corresponding linearized system, to guarantee the existence of coexistence states of the above juvenile-adult model.

scholarly journals Lipid oxidation by heart mitochondria from young adult and senescent rats

1978 ◽  
Vol 170 (2) ◽  
pp. 285-295 ◽  
Author(s):  
Richard G. Hansford
Keyword(s):  
Age Groups ◽  
Heart Mitochondria ◽  
Synthetase Activity ◽  
Age Group ◽  
Carnitine Acetyltransferase ◽  
O2 Uptake ◽  
First Order ◽  
Old Rats ◽  
Group 2 ◽  
Two Age Groups

1. State-3 (i.e. ADP-stimulated) rates of O2 uptake with palmitoylcarnitine, palmitoyl-CoA plus carnitine, pyruvate plus malonate plus carnitine and octanoate as respiratory substrate were all diminished in heart mitochondria isolated from senescent (24-month-old) rats compared with mitochondria from young adults (6 months old). By contrast, State-3 rates of O2 uptake with pyruvate plus malate or glutamate plus malate were the same for mitochondria from each age group. 2. Measurements of enzyme activities in disrupted mitochondria showed a decline with senescence in the activity of acyl-CoA synthetase (EC 6.2.1.2 and 6.2.1.3), carnitine acetyltransferase (EC 2.3.1.7) and 3-hydroxy-acyl-CoA dehydrogenase (EC 1.1.1.35), but no change in the activity of carnitine palmitoyltransferase (EC 2.3.1.21) or acyl-CoA dehydrogenase (EC 1.3.99.3). 3. Measurement of dl-[3H]carnitine (in)/acetyl-l-carnitine (out) exchange in intact mitochondria showed decreased rates when the animals used were senescent. However, this followed from a decreased intramitochondrial pool of exchangeable carnitine, such that calculated first-order rate constants for exchange were identical in mitochondria from the two age groups. 4. The decline in acyl-CoA synthetase activity is thought to be the reason for the diminished rate of O2 uptake with octanoate in senescence. The decline in carnitine acetyltransferase activity is considered to be the cause of the diminished rate of O2 uptake with acetylcarnitine or with pyruvate plus malonate plus carnitine as substrate. The mechanism of the diminished rate of O2 uptake with palmitoylcarnitine in senescence is discussed.

scholarly journals Vocabulary size of an adult Lithuanian native speaker

2019 ◽  
pp. 154-181
Author(s):  
Karolina Andriuškevičiūtė ◽  
Loreta Vilkienė
Keyword(s):  
Regression Analysis ◽  
Native Speaker ◽  
Age Groups ◽  
Study Groups ◽  
Analysis Data ◽  
Foreign Languages ◽  
Vocabulary Size ◽  
Adult Age ◽  
Age Range ◽  
Two Age Groups

This paper aims to answer the question about the vocabulary size of an adult native speaker of the Lithuanian language and to check which sociolinguistic factors have a significant impact on the size of the vocabulary. The material for this study consists of 132 responses given to a sociolinguistic survey and a vocabulary size test. The data was analysed using the statistical R-Studio program. T-test and regression analysis were also applied in the research. Participants of the study were divided into two age groups (the younger and the older) as the adult age range is very broad. In total, the younger group consisted of 68 participants: 31 females and 37 males. The average age of this group is about 22. The older group consisted of 64 participants: 30 females and 34 males. The average age of this group is about 49. The study has revealed that the vocabulary of a younger native speaker (about 22 years old) is about 57,490 words and that the vocabulary size varies between 42,021 and 72,703 words. It has been found that the vocabulary of an older native speaker (about 49 years old) is about 60,770 and that the vocabulary size varies between 46,690 and 76,705 words. Regression analysis data shows that such factors as education, knowledge of foreign languages and reading fiction have a significant impact on the size of vocabulary. The study has also revealed that the size of the vocabulary is significantly larger for participants with a Master’s degree. Furthermore, the vocabulary size is larger for those individuals who know several languages which may not necessarily share any vocabulary with the Lithuanian language. Regression analysis data also indicates that reading fiction can significantly influence the size of vocabulary and that the vocabulary is larger for those participants who read sometimes, often or daily. It must be noted that the sample of participants in this study is relatively small, so all the findings and insights need to be verified by expanding the study groups.

Concordance of Glucose-Based and of HbA1c-Based Diagnoses of Diabetes in Patients with Peripheral Artery Disease—A Comparison between Two Age Groups

Diabetes ◽  
2018 ◽  
Vol 67 (Supplement 1) ◽  
pp. 1522-P
Author(s):  
CHRISTOPH H. SAELY ◽  
ALEXANDER VONBANK ◽  
CHRISTINE HEINZLE ◽  
DANIELA ZANOLIN ◽  
BARBARA LARCHER ◽  
...  
Keyword(s):  
Peripheral Artery Disease ◽  
Age Groups ◽  
Peripheral Artery ◽  
Artery Disease ◽  
Two Age Groups

Foundation for the Prevention and Pathological Aspects of Diseases of the Mucous Membranes of the Oral Cavity (Review)

2020 ◽  
Vol 3 (6) ◽  
pp. 8-11
Author(s):  
Bakaev Zh. N.
Keyword(s):  
Oral Cavity ◽  
Rural Women ◽  
Rural Areas ◽  
Southern China ◽  
Age Groups ◽  
Urban Residents ◽  
Volgograd Region ◽  
Mucous Membranes ◽  
The Russian Federation ◽  
Two Age Groups

According to the authors, the prevalence of SOPR diseases is from 3 to 20%.In a study of 1573 residents of southern China in two age groups who use tobacco and alcohol, the incidence of SOPR was higher among men living in rural areas compared to urban residents. Among women aged 35-44 years, the incidence was higher in urban women, and in the 65-77-year-old group in rural women. In the course of studies in Brazil, among 335 patients older than 60 years, 646 diseases of the SOPR were identified. Similar results were obtained in the analysis of SOPR diseases in the Volgograd region of the Russian Federation

Assessment of ST2 for Risk of Death Following Graft-versus-Host Disease in the Pediatric and Adult Age Groups

2019 ◽  
Author(s):  
Courtney Rowan ◽  
Francis Pike ◽  
Kenneth R. Cooke ◽  
Robert Krance ◽  
Paul A. Carpenter ◽  
...  
Keyword(s):  
Graft Versus Host Disease ◽  
Age Groups ◽  
Host Disease ◽  
Adult Age ◽  
Graft Versus Host ◽  
Risk Of Death

Internet Sex discourse and porn viewing by Arab adolescents: The overt and the covert and its impact on their sexual education and behavior (Preprint)

2018 ◽  
Author(s):  
Anat Gesser-Edelsburg ◽  
Munawar Abed Elhadi
Keyword(s):  
Age Groups ◽  
Sexual Education ◽  
The Internet ◽  
Traditional Values ◽  
Sexual Discourse ◽  
Cultural Taboos ◽  
Internet Sex ◽  
And Behavior ◽  
Depth Interviews ◽  
Two Age Groups

BACKGROUND Due to the religious proscription, it was found that Arab youths acquire information and view pornography secretly. The internet exposes them to contents that contradict religious and cultural taboos. There are few studies about viewing habits of sexual contents among Arab adolescents and about the way they discuss sexuality. OBJECTIVE to characterize the barriers and difficulties that prevent sexual discourse in Arab society and enable pornography viewing, according to the perceptions of adolescents and mothers. METHODS phenomological qualitative research methods, in-depth interviews with 40 participants. 20 Arab adolescents, sampled by two age groups: 14-16 and 16-18. In addition, 20 mothers of adolescents from both sexes were interviewed. RESULTS The findings indicate that mothers “turn a blind eye” to porn viewing and sexual activity by boys, versus a sweeping prohibition and denial of such behavior by girls. The boys reported viewing porn routinely, whereas girls denied doing so, but admitted that their girlfriends watched porn. The study also found that the boys have guilt feelings during and after the viewing as a result of the clash between modernity and traditional values. CONCLUSIONS It is necessary to find a way to encourage a significant sexual discourse to prevent the violent consequences of its absence in Arab society. A controlled, transparent and critical sexual discourse could help youth make more informed decisions concerning the search for sexual contents, porn viewing and sexual behavior.

scholarly journals A Reduced Dose Whole Virion Aluminum Adjuvanted Seasonal Influenza Vaccine Is Immunogenic, Safe, and Well Tolerated in Pediatric Patients

Viruses ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 500
Author(s):  
Zoltan Vajo ◽  
Gergely Balaton ◽  
Peter Vajo ◽  
Peter Torzsa
Keyword(s):  
Pediatric Patients ◽  
Geometric Mean ◽  
Age Groups ◽  
Aluminum Phosphate ◽  
Vaccine Virus ◽  
Serious Adverse Events ◽  
Reduced Dose ◽  
Viral Hemagglutinin ◽  
Virus Strains ◽  
Two Age Groups

Background: Data suggest that pediatric patients might react differently to influenza vaccination, both in terms of immunity and side effects. We have recently shown that using a whole virion vaccine with aluminum phosphate adjuvants, reduced dose vaccines containing 6 µg of viral hemagglutinin (HA) per strain are immunogenic, and well tolerated in adult and elderly patients. Here we show the results of a multicenter clinical trial of pediatric patients, using reduced doses of a new, whole virion, aluminum phosphate adjuvanted vaccine (FluArt, Budapest, Hungary). Methods: A total of 120 healthy volunteers were included in two age groups (3–11 years, receiving 3 µg of HA per strain, and 12–18 years, receiving 6 µg of HA per strain). We used hemagglutination inhibition testing to assess immunogenicity, based on EMA and FDA licensing criteria, including post/pre-vaccination geometric mean titer ratios, seroconversion and seropositivity rates. Safety and tolerability were assessed using CHMP guidelines. Results: All subjects entered the study and were vaccinated (ITT population). All 120 subjects attended the control visit on Day 21 (PP population). All immunogenicity licensing criteria were met in both age groups for all three vaccine virus strains. No serious adverse events were detected and the vaccine was well tolerated by both age groups. Discussion: Using a whole virion vaccine and aluminum phosphate adjuvants, a reduction in the amount of the viral hemmaglutinin is possible while maintaining immunogenicity, safety and tolerability in pediatric and adolescent patients.

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