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Wyświetlanie 1-15 z 33
Tytuł:
Assessment of the molecular cytogenetic, morphometric and biochemical parameters of Deschampsia antarctica from its southern range limit in maritime Antarctic
Autorzy:
Navrotska, Daria
Andreev, Igor
Betekhtin, Alexander
Rojek, Magdalena
Parnikoza, Ivan
Myryuta, Ganna
Poronnik, Oksana
Miryuta, Natalia
Szymanowska-Pułka, Joanna
Grakhov, Volodymyr
Ivannikov, Roman
Hasterok, Robert
Kunakh, Viktor
Powiązania:
https://bibliotekanauki.pl/articles/2041909.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic
Deschampsia antarctica
marginal populations
variation
phenotypic characteristics
Źródło:
Polish Polar Research; 2018, 39, 4; 525-548
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Finite Population Mean Using Deciles of an Auxiliary Variable
Autorzy:
Subramani, J.
Kumarapandiyan, G.
Powiązania:
https://bibliotekanauki.pl/articles/466087.pdf
Data publikacji:
2013
Wydawca:
Główny Urząd Statystyczny
Tematy:
mean squared error
natural populations
simple random sampling
Opis:
The present paper deals with a class of modified ratio estimators for estimation of population mean of the study variable when the population deciles of the auxiliary variable are known. The biases and the mean squared errors of the proposed estimators are derived and compared with that of existing modified ratio estimators for certain known populations. Further, we have also derived the conditions for which the proposed estimators perform better than the existing modified ratio estimators. From the numerical study it is also observed that the proposed modified ratio estimators perform better than the existing modified ratio estimators.
Źródło:
Statistics in Transition new series; 2013, 14, 1; 75-88
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The local populations of the fungus Schizophyllum commune Fr. as drivers of its biodiversity
Autorzy:
Boiko, Sergiy
Powiązania:
https://bibliotekanauki.pl/articles/2040907.pdf
Data publikacji:
2021
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
Schizophyllum commune
gene drift
genetic structure
local populations
terrain
Opis:
Changes that occur on the local level can explain the processes on the population level and, at the same time, are the driving force of species adaptation. This manuscript reports data about genetic diversities of the fungus Schizophyllum commune on the level of a local population. Objects of the study were dicarious cultures of S. commune collected from 38 basidiocarps grown on the territory of Holosiivskyi National Nature Park, Lysa Hora Regional Landscape Park and Feofaniya forest parcel (Ukraine). Results showed similarity of genetic variability of S. commune in different local populations. The heterozygote deficiency of some loci that was discovered might have resulted from new forms of allozymes that have not become widespread or due to small population sizes. The degree of differentiation of genes between local studied populations was moderate due to the high flow of genes. The absence of spatial structuration of genotypes is established, and the Mantel test showed a lack of interconnection between the genetic component and the geographical coordinates of the samples. It has been suggested that wind direction and terrain are the factors that influence the genetic structure of local populations.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2021, 63, 4; 308-316
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing dizziness and vertigo inventory responses in Thai and Thai-Chinese people
Autorzy:
Coelho, Carlos M
Pisitsungkagarn, Kullaya
Taephant, Nattasuda
Balaban, Carey D
Powiązania:
https://bibliotekanauki.pl/articles/2106204.pdf
Data publikacji:
2019-04-30
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
Motion sickness
Fear of heights
Vertigo syndromes
Asian populations
Opis:
It is acknowledged that ancestry may play a role in the likelihood of reporting motion sickness, based upon questionnaires in which symptoms are reported more frequently in individuals with Asian ancestry. This study compares motion sickness and related vertigo syndromes in Thai and Thai-Chinese populations. The Motion Sickness Questionnaire; Albany Panic and Phobia Questionnaire; Acrophobia Questionnaire; Body Symptoms Questionnaire and the Situational Characteristics Questionnaire were administered to 128 participants. Eighty-eight participants had a father, mother and all grandparents of Thai origin, while 44 participants had with at least one Chinese ancestor among parents or grandparents. All responses were similar between groups except regarding fear of heights, which is significantly higher in Thai participants without recent Chinese ancestors. Reported motion sickness sensitivity is similar between Thai and Chinese populations. The group differences for some fear of heights items may be linked to each group’ previous experience with heights. Results also suggest that although conquering a fear of heights might require specific visuo-vestibular adaptations, these adaptations alone may not be sufficient to lessen an individual’sfear of heights.
Źródło:
Acta Neuropsychologica; 2019, 17(1); 55-67
1730-7503
2084-4298
Pojawia się w:
Acta Neuropsychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Juniperus excelsa s. str. in Crimea - differentiation and history inferred from genetic and morphological markers
Autorzy:
Mazur, Małgorzata
Jadwiszczak, Katarzyna A.
Bona, Agnieszka
Krasylenko, Yuliya
Kukushkin, Oleg
Marcysiak, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/2040954.pdf
Data publikacji:
2021
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
biometry
cpDNA
Crimean Sub-Mediterranean
isolated populations
juniper
ITS
Opis:
Juniperus excelsa s. str. (Greek juniper) in Crimea is a relic species on the limits of its range, and represents the Mediterranean flora in the Sub-Mediterranean part of the peninsula. Its origin and history in this area remains unresolved. We aimed to analyze phylogeny and potential demographic expansion of the juniper in the Crimea as well as to study its morphological differentiation. We analyzed plant material from 59 trees inhabiting eight populations. Genetic variation assessments were based on the four non-coding chloroplast DNA (cpDNA) fragments and the nuclear internal transcribed spacer region ITS1-5,8S-ITS2 (ITS). To examine the morphological differentiation, eight measured/counted traits of cones, seeds, and shoots were chosen and eight ratios were calculated. Morphological parameters were compared using ANOVA, Student’s t test, discrimination analysis and Kruskal-Wallis and U MannWhitney tests. Two cpDNA fragments were polymorphic and, in total, 10 cpDNA haplotypes were found. Haplotype diversity (Hd) ranged from 0.0 to 0.9. Based on both cpDNA and ITS sequences variation, phylogenetic analyses revealed a close relationship of the Crimean junipers to the individuals from other parts of the species range. In general, our molecular results confirmed the low level of genetic differentiation of J. excelsa individuals inhabiting different parts of the species range, likely resulting from a common ancestry. Only slight morphological differences were found between populations with different geographic location or habitat. The analyzes showed the distinctness of the populations from the southern part of the coast. Some unique morphological and molecular features of southern coastal populations imply that they are remnants of Late Pleistocene abundant forests. We suggest that the recent fragmentation of the Juniperus populations in the Crimean Peninsula could have arisen during the Atlantic period of the Holocene.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2021, 63, 4; 276-288
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Modelling: Application to the financial sector
Autorzy:
Roçadas, Cláudia
Oliveira, Teresa
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729944.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
populations with periodic reclassification
likelihood ratio tests
Markov chains
isomorphism
Opis:
Our research is centred on the stochastic structure of matched open populations, subjected to periodical reclassifications. These populations are divided into sub-populations. In our application we considered two populations of customers of a bank: with and without account manager. Two or more of such population are matched when there is a 1-1 correspondence between their sub-populations and the elements of one of them can go to another, if and only if the same occurs with elements from the corresponding sub-populations of the other. So we have inputs and outputs of elements in the population and along with several sub-populations in which the elements can be placed. It is thus natural to use Markov chains to model these populations.
Besides this study connected with Markov chains we show how to carry out Analysis of Variance - like analysis of entries and departures to and from de populations of customers. Our purpose is to study the flows in and out of customers in classes for the two populations and to make research on the influence of the factors year, class and region. We used the Likelihood ratio tests for the hypotheses formulated on the basis of these factors. In our work we verified that major hypotheses were all rejected. This raises the question of what are the effects and interactions truly relevant. Looking for an answer to this problem, we present the first partition to a change in the log Likelihood. This partition is very similar to the analysis of variance for the crossing of the factors that allowed us to use algebraic established results, see Fonseca et al. (2003, 2006), for models with balanced cross.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2011, 31, 1-2; 103-119
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
As sociedades em risco e os múltiplos fatores que fragilizam as relações sociais em tempos de pandemia
Autorzy:
Faria, Lina
Castro Santos, Luiz A. de
Chavez Alvarez, Rocio Elizabeth
Powiązania:
https://bibliotekanauki.pl/articles/2131629.pdf
Data publikacji:
2022-06-30
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
populations at risk
social inequalities
health inequities
vulnerabilities
violence
pandemic
Opis:
O texto é uma reflexão sobre as noções de risco, vulnerabilidades, desigualdades, violências e seus impactos nas sociedades em tempos de pandemia. Abordar as interrelações entre esses conceitos e os fatores que fragilizam as relações sociais é uma problemática que ainda carece de discussão. O objetivo foi analisar algumas proposições conceituais e epistemológicas da teoria da sociedade global de risco de Ulrich Beck, da teoria dos sistemas e o conceito de risco de Niklas Luhmann e a produção de sentidos sobre riscos de Mary Jane Spink, em consonância com a relação paradoxal entre autonomia e vulnerabilidade no “pensar e agir” humano de Paul Ricoeur. Aborda também, o cenário de aprofundamento das desigualdades e das violências entre os grupos em situação de vulnerabilidade, em tempos de pandemia, mais evidente em função do crescimento das taxas de homicídios nos últimos três anos. Essas análises ajudam a entender as inseguranças com as quais a sociedade de risco diariamente se defronta, como uma pandemia, que podem fragilizar ainda mais as condições básicas de vida das populações em situação de vulnerabilidade e ampliar as desigualdades e violências.
This text is a reflection on the perceptions of risk, social inequality, violence, and their impacts on societies in times of pandemic. Addressing the interrelationships between these concepts and the factors that weaken social relations is a problem that still lacks discussion. In discussing these concepts, the aim of the present text is to analyze, although briefly, some conceptual and epistemological proposals and implications of the thought of Ulrich Beck and Niklas Luhmann on reflexive modernization, global risk societies and social systems. In addition, the text examines the social psychologist Mary Jane Spink’s considerations on risk from the point of view of the production of meanings. The text also discusses the paradoxical relationship between autonomy and vulnerability in the human "thinking and acting" of the Paul Ricoeur. The scenario of deepening inequalities and violence among vulnerable groups in these times of pandemic, most evident due to the growth in homicide and unemployment rates, is also discussed in the last three years. These analyses help to understand the insecurity that the risk society faces on a daily basis, such as a pandemic, which can further weaken the basic living conditions of vulnerable populations while expanding inequalities and violence.
Źródło:
Revista del CESLA. International Latin American Studies Review; 2022, 29; 11-28
1641-4713
Pojawia się w:
Revista del CESLA. International Latin American Studies Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical diversity of silverweed (Potentilla anserina L.) growing at the edges of arable fields.
Autorzy:
Angielczyk, Mirosław
Bączek, Katarzyna
Geszprych, Anna
Przybył, Jarosław L.
Węglarz, Zenon
Powiązania:
https://bibliotekanauki.pl/articles/2199570.pdf
Data publikacji:
2010-06-01
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
catechins
flavonoids
phenolic acids
populations
secondary metabolites
silverweed herb
tannins
Opis:
The medicinal usage of silverweed herb (Anserinae herba) is primarily related to the presence of phenolic compounds. Three populations of silverweed (Potentilla anserina L.) occurring at the edges of arable fields in Podlasie area (north-eastern Poland) were compared in respect of the content and composition of phenolics. Herb collected from the investigated populations differed in the content of determined compounds. The tannin content was very low (0.81-0.91%). The total flavonoid content ranged from 0.48 to 0.60%. Phenolic acid content was much higher (1.38-2.26%). Three flavan-3-ols: (+)-catechin, (-)-epicatechin, and (-)-epigallocatechin, four flavonol glycosides: rutoside, quercetin-3-O-glucoside, isorhamnetin-3-O-glucoside, and kaempferol-3-O-glucoside, as well as one phenolic acid (ellagic acid) were identified as a_result of HPLC analysis of methanolic extracts from the investigated raw materials. The most considerable differences between populations concerned the content of (+)-catechin (87.0-199.3 mg × 100 g-1), (-)-epigallocatechin (141.9-290.6 mg × 100 g-1), and rutoside (192.3-386.0 mg × 100 g-1) in herb...
Źródło:
Plant Breeding and Seed Science; 2010, 61; 41-46
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Zabić Indianina w dziecku”. O kulturowym ludobójstwie w Kanadzie i sprawiedliwości tranzycyjnej z Kate Korycki rozmawia Anna Zawadzka [“Kill the Indian in the Child.” On cultural genocide and transitional justice in Canada. Kate Korycki in an interview by Anna Zawadzka]
Autorzy:
Zawadzka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/643837.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Slawistyki PAN
Tematy:
Canada
cultural genocide
transitional justice
indigenous populations
colonialism
racism
nation
Opis:
“Kill the Indian in the Child.” On cultural genocide and transitional justice in Canada. Kate Korycki in an interview by Anna ZawadzkaThis is an interview with Kate Korycki on the reparations for the native population in Canada for what the Canadian government defined as “cultural genocide.” Kate Korycki was born in Warsaw and has lived in Toronto for 25 years. Until 2006 she worked for the Canadian Government in a ministry delivering federal social programs, like unemployment insurance and pensions. Her last job involved the implementation of the Common Experience Payment. This was the largest government program to offer reparations for the wrongs suffered by the indigenous population in Canada in residential schools, which were run for 150 years by the Catholic and Unitarian Churches. The schools have recently been characterized as sites of cultural genocide.Kate Korycki is completing her doctorate in political science at the University of Toronto. She holds an MA in Political Science from McGill University. Her broad research agenda concerns the politics of identity, belonging, and conflict. In her doctoral work she is concentrating on the politics of identity in time of transition. „Zabić Indianina w dziecku”. O kulturowym ludobójstwie w Kanadzie i sprawiedliwości tranzycyjnej z Kate Korycki rozmawia Anna ZawadzkaAnna Zawadzka przeprowadza wywiad z Kate Korycki na temat odszkodowań przyznanychrdzennym mieszkańcom w Kanadzie za to, co rząd kanadyjski określił mianem „kulturowego ludobójstwa”. Kate Korycki urodziła się w Warszawie i mieszka w Toronto od 25 lat. Do 2006 roku pracowała dla rządu kanadyjskiego, w ministerstwie spraw społecznych, takich jak bezrobocie czy emerytury. Jej ostatnia funkcja polegała na wdrożeniu „Zadośćuczynienia Wspólnego Doświadczania” (Common Experience Payment). Ten program był najszerszym gestem władz federalnych w postaci rządowych reparacji za krzywdy wyrządzone w szkołach rezydencyjnych wobec rdzennych mieszkańców w Kanadzie. Szkoły te były prowadzone przez 150 lat przez Kościół katolicki i unitariański. To właśnie działalność tych szkół została określona mianem kulturowego ludobójstwa.Kate Korycki pisze doktorat z nauk politycznych na Uniwersytecie w Toronto, po magisterium na Uniwersytecie Mcgill. Jej zainteresowania skupiają się na polityce tożsamości, przynależności i konflikcie. 
Źródło:
Studia Litteraria et Historica; 2016, 5
2299-7571
Pojawia się w:
Studia Litteraria et Historica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Telling the Collective Story: Symbolic Interactionism in Narrative Research
Autorzy:
van den Hoonaard, Deborah K.
Powiązania:
https://bibliotekanauki.pl/articles/2106997.pdf
Data publikacji:
2013-07-31
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Narrative Research
Symbolic Interaction
Sensitizing Concepts
Widowhood
Bahá’í
Marginalized Populations
Opis:
Recent years have seen tremendous growth of interest in narrative approaches to research in both the social sciences and the humanities. Much of this research focuses on the stories of individuals and how they tell them. This article addresses the contribution of a symbolic interactionist approach to develop the “collective story” (Richardson 1990) through the use of sensitizing concepts. It focuses on research on the experience of widows, widowers, and Iranian Bahá’í refugees to Canada to demonstrate how one can use sensitizing concepts to craft a collective story of members of marginalized populations that sit at the bottom of the “hierarchy of credibility” (Becker 1967).
Źródło:
Qualitative Sociology Review; 2013, 9, 3; 32-45
1733-8077
Pojawia się w:
Qualitative Sociology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On permutation location–scale tests
Autorzy:
Polko-Zając, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/1186913.pdf
Data publikacji:
2019-12-10
Wydawca:
Główny Urząd Statystyczny
Tematy:
permutation tests
comparing populations
test power
the Lepage test
the Cucconi test
Opis:
Statisticians are constantly looking for methods of statistical inference that would be both effective and would require meeting as few assumptions as possible. Permutation tests seem to fit here, as using them makes it possible to perform statistical inference in situations where classical parametric tests do not work. Permutation tests appear to be comparably powerful to parametric tests, but require meeting fewer assumptions, e.g. regarding the size of the sample or the from of distribution of the tested variable in a population. The presented tests make it possible to verify the overall hypothesis about the identity of both location and scale parameters in the studied populations. In literature, the Lepage test and the Cucconi test are most often referred to in this context. The paper considers various forms of test statistics, and presents a simulation study carried out to determine the size and power of the tests under normality. As the study demonstrated, the advantage of the proposed method is that it can be applied to small-size samples. A nonparametric, complex procedure was used to assess the overall ASL (achieved significance level) value by applying the permutation principle. For comparative purposes, the results for the permutation Lepage test and the permutation Cucconi test are also presented.
Źródło:
Statistics in Transition new series; 2019, 20, 4; 153-166
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The genetic diversity of HLA DRB1* alleles among Indian and African populations
Autorzy:
Nandakumar, R.
Powiązania:
https://bibliotekanauki.pl/articles/1158256.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Admixture
Demography
HLA DRB1
Indian and African populations
Migration
Population Genetics
Opis:
The HLA system is highly polymorphic and commonly used as a marker to understand core population genetical aspects such as stratification, human migration, predisposition to diseases and tissue transplantation compatibility. Although HLA alleles are generally treated as equidistant molecular units in population genetic studies, the diversity of DNA allelic frequencies among populations is also considered to be crucial to interpret the observed HLA polymorphisms. This study compares the variation of HLA DRB1 alleles across various subgroups of both Indian and African Populations, using their respective allelic frequencies. The HLA DRB1 allelic frequencies for 3,153 individuals of 32 subgroups of both Indian and African populations, were collected from the Allele Frequency Net Database (AFND). Correlation matrix and Grid diagram were compiled using the R statistical package. Allele frequencies were analyzed for the respective population subgroups using XLSTAT. The North East Indian populations were completely devoid of HLA DRB1* 16, which is fairly present in south Indian populations. The South Indian populations harbor both HLA DRB1* 10 and HLA DRB1* 15 at relatively higher levels but are very scarce of HLA DRB1* 07, HLA DRB1* 09, HLA DRB1* 12 and HLA DRB1* 13. The alleles HLA DRB1* 03, HLA DRB1* 04 and HLA DRB1* 07 could represent an epicenter for the admixture of African, North-East Indian and South Indian populations.
Źródło:
World Scientific News; 2018, 114; 15-29
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Demographic Structure of Society and Individual Farmers Social Insurance
Struktura demograficzna społeczeństwa a ubezpieczenie społeczne rolników indywidualnych
Autorzy:
Łuczka-Bakuła, Władysława
Jabłońska-Porzuczek, Lidia
Powiązania:
https://bibliotekanauki.pl/articles/2033564.pdf
Data publikacji:
2007-12-31
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
Demographic structure
Demographic structure of rural populations
Arable farm
Individual arable farms
Social insurance
Opis:
Farmers' social insurance system is financed by the state budget to a considerable degree. It results from low premium paid by insured, as well as the lack of its resistance towards changes in demographic potential. In the face of that, considering both economic and demographic factors the farmers' social insurance system reform should be introduced. 
System ubezpieczenia społecznego rolników indywidualnych w znacznym stopniu jest finansowany z budżetu państwa. Wynika to zarówno z niskiej wysokości składki uiszczanej przez ubezpieczonych, jak i braku odporności tego systemu na zmiany za-chodzące w potencjale demograficznym. Zagrożenia demograficzne są spowodowane zmniejszającą się liczbą urodzeń oraz wydłużeniem średniego czasu trwania życia. Ma to istotny związek ze wzrostem współczynnika zależności demograficznej. Jednocześnie nie wpływa to na wielkość współczynnika zależności systemowej, który ulega stopniowemu spadkowi. Jest to spowodowane zachowaną od 1999 roku tendencją wzrostową - dotyczącą liczby ubezpieczonych, natomiast spadkową - dotyczącą liczby świadczeniobiorców. Pomimo tak korzystnej relacji, przychody FER, pochodzące ze składek, nie wystarczają na pokrycie wydatków związanych z wypłatą świadczeń. Wobec tego uwzględniając zarówno czynniki ekonomiczne, jak i demograficzne należałoby przeprowadzić reformę systemu ubezpieczeń społecznych rolników indywidualnych. 
Źródło:
Journal of Agribusiness and Rural Development; 2007, 6, 385; 77-84
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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