scholarly journals The structure of the allelic partition of the total population for Galton–Watson processes with neutral mutations

2009 ◽  
Vol 37 (4) ◽  
pp. 1502-1523 ◽  
Author(s):  
Jean Bertoin
Keyword(s):  
Total Population ◽  
Neutral Mutations

scholarly journals Weak limits for the largest subpopulations in Yule processes with high mutation probabilities

2017 ◽  
Vol 49 (3) ◽  
pp. 877-902 ◽  
Author(s):  
Erich Baur ◽  
Jean Bertoin
Keyword(s):  
Total Population ◽  
General Strategy ◽  
Limit Laws ◽  
Percolation Parameter ◽  
Yule Process ◽  
Large Numbers ◽  
Weak Limits ◽  
Poisson Limit ◽  
Neutral Mutations ◽  
Recursive Trees

Abstract We consider a Yule process until the total population reaches size n ≫ 1, and assume that neutral mutations occur with high probability 1 - p (in the sense that each child is a new mutant with probability 1 - p, independently of the other children), where p = pn ≪ 1. We establish a general strategy for obtaining Poisson limit laws and a weak law of large numbers for the number of subpopulations exceeding a given size and apply this to some mutation regimes of particular interest. Finally, we give an application to subcritical Bernoulli bond percolation on random recursive trees with percolation parameter pn tending to 0.

scholarly journals Theoretical study of near neutrality. II. Effect of subdivided population structure with local extinction and recolonization.

Genetics ◽  
1992 ◽  
Vol 130 (4) ◽  
pp. 917-923
Author(s):  
T Ohta
Keyword(s):  
Population Structure ◽  
Migration Rate ◽  
Total Population ◽  
Theoretical Study ◽  
Fixation Index ◽  
Weak Selection ◽  
Total Size ◽  
Subdivided Population ◽  
Nearly Neutral Mutations ◽  
Neutral Mutations

Abstract There are several unsolved problems concerning the model of nearly neutral mutations. One is the interaction of subdivided population structure and weak selection that spatially fluctuates. The model of nearly neutral mutations whose selection coefficient spatially fluctuates has been studied by adopting the island model with periodic extinction-recolonization. Both the number of colonies and the migration rate play significant roles in determining mutants' behavior, and selection is ineffective when the extinction-recolonization is frequent with low migration rate. In summary, the number of mutant substitutions decreases and the polymorphism increases by increasing the total population size, and/or decreasing the extinction-recolonization rate. However, by increasing the total size of the population, the mutant substitution rate does not become as low when compared with that in panmictic populations, because of the extinction-recolonization, especially when the migration rate is limited. It is also found that the model satisfactorily explains the contrasting patterns of molecular polymorphisms observed in sibling species of Drosophila, including heterozygosity, proportion of polymorphism and fixation index.

From the Oort cloud to Halley-type comets

1999 ◽  
Vol 173 ◽  
pp. 327-338 ◽  
Author(s):  
J.A. Fernández ◽  
T. Gallardo
Keyword(s):  
Total Population ◽  
Complex Function ◽  
Dynamical Evolution ◽  
Oort Cloud ◽  
Capture Process ◽  
Influx Rate ◽  
Short Period ◽  
Dynamical Properties ◽  
Orbital Periods ◽  
Probability Of Capture

AbstractThe Oort cloud probably is the source of Halley-type (HT) comets and perhaps of some Jupiter-family (JF) comets. The process of capture of Oort cloud comets into HT comets by planetary perturbations and its efficiency are very important problems in comet ary dynamics. A small fraction of comets coming from the Oort cloud − of about 10−2− are found to become HT comets (orbital periods < 200 yr). The steady-state population of HT comets is a complex function of the influx rate of new comets, the probability of capture and their physical lifetimes. From the discovery rate of active HT comets, their total population can be estimated to be of a few hundreds for perihelion distancesq <2 AU. Randomly-oriented LP comets captured into short-period orbits (orbital periods < 20 yr) show dynamical properties that do not match the observed properties of JF comets, in particular the distribution of their orbital inclinations, so Oort cloud comets can be ruled out as a suitable source for most JF comets. The scope of this presentation is to review the capture process of new comets into HT and short-period orbits, including the possibility that some of them may become sungrazers during their dynamical evolution.

Concerning the Representativeness of Psychiatric Catamnestical Studies - The Influence of Various Approach Strategies on the Response of Former Patients

1986 ◽  
Vol 25 (03) ◽  
pp. 171-175
Author(s):  
I. Steinhart ◽  
G. Bosch ◽  
Th. Muhr ◽  
E. Mohlfeld
Keyword(s):  
Total Population ◽  
Social Psychiatry ◽  
Personal Contact ◽  
Sample Collection ◽  
Careful Planning ◽  
Research Project ◽  
Phone Calls ◽  
Registration Procedure

SummaryThe possible conclusions reached by catamnestical studies are often significantly restricted because of the lack of representativeness of the sample. The example of an investigation of former patients of the Department of Social Psychiatry proves that positive responses to an interview are influenced by various factors. As expected, patients were more inclined to participate in the research project the closer their discharge was to the time of the project itself. Further, it became clear that various different approach strategies, such as letters, enquiries with the registration authorities, phone calls and house visits, effectively increased the motivation of former patients, and that only this kind of graded registration procedure guarantees motivation leading to a sample representative of the total population. Personal contact plays an especially important role. These empirical findings indicate the necessity of careful planning and implementation of sample collection in catamnestical studies. Without this approach, representative results cannot be expected.

Management of Haemophilia in Sweden

1976 ◽  
Vol 35 (03) ◽  
pp. 510-521 ◽  
Author(s):  
Inga Marie Nilsson
Keyword(s):  
Factor Viii ◽  
Total Population ◽  
Age Groups ◽  
Factor Ix ◽  
Haemophilia A ◽  
Severe Haemophilia ◽  
Haemophilia B ◽  
Human Fraction ◽  
Mild Haemophilia

SummaryThe incidence of living haemophiliacs in Sweden (total population 8.1 millions) is about 1:15,000 males and about 1:30,000 of the entire population. The number of haemophiliacs born in Sweden in 5-year periods between 1931-1975 (June) has remained almost unchanged. The total number of haemophilia families in Sweden is 284 (77% haemophilia A, 23% haemophilia B) with altogether 557 (436 with A and 121 with B) living haemophiliacs. Of the haemophilia A patients 40 % have severe, 18 % moderate, and 42 % mild, haemophilia. The distribution of the haemophilia B patients is about the same. Inhibitors have been demonstrated in 8% of the patients with severe haemophilia A and in 10% of those with severe haemophilia B.There are 2 main Haemophilia Centres (Stockholm, Malmo) to which haemophiliacs from the whole of Sweden are admitted for diagnosis, follow-up and treatment for severe bleedings, joint defects and surgery. Minor bleedings are treated at local hospitals in cooperation with the Haemophilia Centres. The concentrates available for treatment in haemophilia A are human fraction 1-0 (AHF-Kabi), cryoprecipitate, Antihaemophilic Factor (Hyland 4) and Kryobulin (Immuno, Wien). AHF-Kabi is the most commonly used preparation. The concentrates available for treatment in haemophilia B are Preconativ (Kabi) and Prothromplex (Immuno). Sufficient amounts of concentrates are available. In Sweden 3.2 million units of factor VIII and 1.0 million units of factor IX are given per year. Treatment is free of charge.Only 5 patients receive domiciliary treatment, but since 1958 we in Sweden have practised prophylactic treatment of boys (4–18 years old) with severe haemophilia A. At about 5-10 days interval they receive AHF in amounts sufficient to raise the AHF level to 40–50%. This regimen has reduced severe haemophilia to moderate. The joint score is identical with that found in moderate haemophilia in the same age groups. For treatment of patients with haemophilia A and haemophilia B complicated by inhibitors we have used a large dose of antigen (factor VIII or factor IX) combined with cyclophosphamide. In most cases this treatment produced satisfactory haemostasis for 5 to 30 days and prevented the secondary antibody rise.

A Glanzmann’s Thrombasthenia Cluster Among Iraqi Jews in Israel

1984 ◽  
Vol 52 (03) ◽  
pp. 230-231 ◽  
Author(s):  
U Seligsohn ◽  
S Rososhansky
Keyword(s):  
Total Population ◽  
Carrier State ◽  
Calculated Frequency ◽  
Jewish Origin ◽  
Glanzmann’S Thrombasthenia ◽  
Glanzmann's Thrombasthenia

SummaryA country-wide survey of Glanzmann’s thrombasthenia in Israel identified 44 patients. The patients belong to 23 unrelated families, 17 of whom are of Iraqi Jewish origin. The frequency of thrombasthenia among Iraqi Jews in Israel (total population 270,000) is 1:7714 and thus the calculated frequency of the carrier state is 2.3%.

PENGARUH KEPEMIMPINAN TRANSFORMASIONAL, MOTIVASI DAN KEPUASAN KERJA TERHADAP KINERJA KARYAWAN PT. ADYA TOURS

2017 ◽  
Vol 19 (1) ◽  
pp. 23
Author(s):  
Ahmad Gunawan
Keyword(s):  
Quantitative Research ◽  
Total Population ◽  
Rating Scale ◽  
Research Data ◽  
Positive Direction ◽  
Leadership Motivation ◽  
Multiple Determination ◽  
Strongly Agree ◽  
Transformation Leadership ◽  
Statistic Approach

Transformation Leadership, Motivation and Satisfiction are the three factors of a few relatively large factors suspected to influence Performance on the PT. Adya Tours. These research aimed to determine the effect of Transformation Leadership, Motivation and Satisfiction toward Performance on the PT. Adya Tours.Research conducted at the PT. Adya Tours by taking 71 employees as the research sample, calculated using the Slovin formula of the total population of 240 employees  at  the  margin  of  error  of  10%.  Data  were collected by questionnaire instruments covered by the five rating scale from strongly disagree to strongly agree. Quantitative research was conducted by describing and analyzing research data. The multiple linier regression analysis and multiple determination coeficient are the statistic approach to data analysis.The study produced four major findings consistent with the hypothesis put forward, that are: 1) Transformation Leadership has a significant effect on Performance  in  a  positive  direction;  2)  Motivation  has  a  significant  effect  on Performance in a positive direction; 3) Satisfiction has a significant effect on Performance in a positive direction; 4) Transformation Leadership, Motivation and Satisfiction simultaneously influence 92.70% Performance variability.Base on the research finding, in order to increase Performance can be done by increasing Transformation Leadership, Motivation and Satisfiction. Kata kunci:Transformation Leadership, Motivation, Satisfaction, Performance

Pengaruh Kinerja Keuangan dan Good Corporate Governance (GCG) Terhadap Nilai Perusahaan

MBIA ◽  
2019 ◽  
Vol 17 (2) ◽  
pp. 1-10
Author(s):  
Rolia Wahasusmiah
Keyword(s):  
Corporate Governance ◽  
Firm Value ◽  
Sampling Method ◽  
Total Population ◽  
Annual Report ◽  
Stock Exchange ◽  
Secondary Data ◽  
Positive Influence ◽  
Manufacturing Companies ◽  
Good Corporate Governance

This study aims to determine the effect of financial performance and good corporate governance (GCG) on the value of companies in manufacturing companies listed on the stock exchange Indonesia. The type of data used is secondary data in the form of annual report 2016. Population used in this study are all companies listed on the Indonesia Stock Exchange (BEI). This research uses purposive sampling method with total population of 144 companies and sample of 31 companies. The results show that simultaneously ROA, OPM, NPM, KM, and KI have a positive influence on firm value. While partially ROA  have a positive influence on firm value. While OPM, NPM, KM, and KI have no positive influence on firm value).

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