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    Wyświetlanie 1-7 z 7
    Tytuł:
    Konwencje ustalania wskaźników zróżnicowania lasów
    Conventions of determining indicators of forest diversity
    Autorzy:
    Poznański, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012411.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    metoda przyrodnicza
    metody obliczen
    drzewostany roznowiekowe
    lasy
    lesnictwo
    metoda geometryczna
    wskazniki zroznicowania
    geometric and natural convention of determining indicators of forest diversity
    uneven−aged forest
    diversity characteristics
    Opis:
    There are two conventions of determining indicators of forest diversity: geometric and natural. Indicators in the geometric convention are determined from the ratio of differences in the values of the real characteristic to the value of the characteristic adopted as a comparative norm. Indicators in the natural convention are determined from the ratio of differences in the values of a characteristic in the real world to the mean value of that characteristic by standard deviation. The indicator−based assessment of forests in Poland is based on the geometric convention of similarities and standards included in yield and stand volume increment tables. This convention of similarities (map and plan scales) taken directly from technology has no natural justification. Therefore, it is necessary to determine indicators of forest diversity based on natural convention with special reference to the uneven−aged forests based on natural forests.
    Źródło:
    Sylwan; 2008, 152, 01; 53-57
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic characterization of Tunisian lime genotypes using pomological traits
    Autorzy:
    Saddoud Debbabi, O.
    Abdelaali, S.B.
    Bouhlal, R.
    Zneidi, S.
    Abdelaali, N.B.
    Mars, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1080179.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    genetic characteristics
    diversity
    genetic resource
    lime
    Tunisia
    pomology
    Opis:
    Citrus genus includes a wide number of species that have been long cultivated and well adapted in Tunisia. It is represented by small number of plantations and considered as underutilized in Tunisia. Our goal was to genetically characterize Tunisian lime genotypes to obtain data useful for gene conservation and breeding purposes. The survey of genotypes was conducted in the Cap Bon region, where citrus cultivation is the most spread. Sixteen quantitative and 19 qualitative parameters were evaluated. The observed accessions belonged to three different species: Citrus limetta, Citrus latifolia (limes Byrsa), and Citrus limettioides (limes of Palestine) according to Tanaka classification. Principal component analysis confirmed these classifications. Four-cell analysis (FCA) was used to determine the most threatened genotypes. Quantitative traits were evaluated and allowed the discrimination between genotypes. Many quantitative traits of fruit and juice were highly positively and significantly correlated. Phenotypic diversity was determined using Shannon–Wiener diversity index (H’). The highest value of diversity index was observed for both vesicle thickness and thickness of segment walls (H’ = 0.98). Intermediate values were observed for both fruit axis (H’= 0.49) and pulp firmness (H’ = 0.43). However, fruit shape (H’ = 0.24), shape of fruit apex (H’ = 0.24), and vesicle length (H’ = 0.33) presented the lowest values of diversity index. Current findings will be useful to conserve threatened genotypes ex situ and on farm and also will guide strategic conservation on Citrus genetic resources for future breeding programs.
    Źródło:
    Journal of Horticultural Research; 2020, 28, 1; 65-76
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structuring Corporate Boards: Some Facts and Determinants from the Macedonian Setting
    Autorzy:
    Suklev, Bobek
    Debarliev, Stojan
    Drakulevski, Ljubomir
    Powiązania:
    https://bibliotekanauki.pl/articles/1933534.pdf
    Data publikacji:
    2020-02
    Wydawca:
    Akademia Leona Koźmińskiego w Warszawie
    Tematy:
    corporate governance
    firm characteristics
    board size
    board independence
    board diversity
    Opis:
    Purpose: Knowing the factors that might affect board structure is an important step in understanding boards and their role in corporate governance. This research aims to examine the effect of firm characteristics closely related to corporate governance mechanisms, such as the model of corporate governance, shareholder capital concentration, and stock exchange listing on board structure variables (size, independence, and gender diversity). Methodology: The sample of this study stems from large Macedonian joint-stock companies. We run a hierarchical linear regression of board characteristics on common demographic firm characteristics as control variables and contextual firm characteristics related to corporate governance mechanisms as independent variables. Findings: Joint-stock companies in the Republic of North Macedonia have relatively small boards, which provide no positive effects that would originate from the larger number of board members. Moreover, the number of outside independent members is small, insufficient to influence the boards with greater objectivity, independence, and quality. Larger companies with a one-tier model have statistically significant larger corporate boards and a larger number of independent directors. Implications: The best corporate governance practices worldwide must be used as a basis for future improvements of corporate governance in joint-stock companies in developing economies.
    Źródło:
    Central European Management Journal; 2020, 28(2); 57-82
    2658-0845
    2658-2430
    Pojawia się w:
    Central European Management Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The the effects of socio-economic factors on the food security status of rural households in the eastern Cape province: evidence from farming households
    Autorzy:
    Mnukwa, Minentle Lwando
    Nontu, Yanga
    Mdoda, Lelethu
    Aliber, Machael
    Powiązania:
    https://bibliotekanauki.pl/articles/2141455.pdf
    Data publikacji:
    2022-07-06
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
    Tematy:
    household-level
    food security
    dietary diversity
    socioeconomic characteristics
    logistic regression model
    Opis:
    Issues relating to food availability, accessibility, affordability, and utilization remain of paramount importance among rural households. In order to formulate or implement relevant food security programs in rural areas, it is essential to have a deep understanding of the food security status of rural households. This study sought to determine the prevalence of food insecurity among rural households in the Eastern Cape Province, as well as its key socioeconomic and demographic factors. A cross-sectional study was carried out on 240 households using questionnaires about food security. A convenience sampling method was used to collect data, along with a structured questionnaire. Descriptive statistics and binary logistic regression were used to analyze the data. The binary logistic regression model revealed that age of household head, education level of household head, access to credit, household income, and household size were all associated with food security status. Thus, this study recommends that the government at all levels (local, state, and federal) have an adequate budget allocated to increasing awareness of the benefits of participating in farming to improve the livelihood outcomes of households
    Źródło:
    Journal of Agribusiness and Rural Development; 2022, 64, 2; 141-151
    1899-5241
    Pojawia się w:
    Journal of Agribusiness and Rural Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic diversity in Vernonia amygdalina Delile accessions revealed by random amplified polymorphic DNAs (RAPDs)
    Autorzy:
    Aikpokpodion, P.
    Abebe, J.
    Igwe, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/79809.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    genetic diversity
    Vernonia amygdalina
    random amplified polymorphic DNA
    polymorphism
    molecular characteristics
    single-nucleotide polymorphism
    geographic differentiation
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular characterization of ‘Candidatus Phytoplasma mali’ strains from Bulgaria and Poland
    Autorzy:
    Cieślińska, M.
    Borisova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/12308151.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    Polska
    Bulgaria
    apple proliferation phytoplasma
    molecular characteristics
    Candidatus Phytoplasma mali
    polymerase chain reaction
    RFLP method
    multilocus gene analysis
    genetic diversity
    Opis:
    During 2015, samples from 22 apple trees showing proliferation symptoms were collected in southwest Bulgaria and Central and South Poland and tested for phytoplasma presence. ‘Candidatus Phytoplasma mali’ was identified in 18 samples based on results of restriction fragment length polymorphism (RFLP) analysis of the 16S rRNA gene amplified in nested PCR using primer pair P1/P7 followed by R16F2n/R16R2 and F1/B6 primer pairs. The nitroreductase and rhodonase-like genes and ribosomal protein genes rpl22 and rps3 were then analyzed using PCR-RFLP technique to study the genetic variability of the phytoplasma strains. Two restriction profiles, P-I or P-II, were obtained from fragments of 16S rDNA plus 16S-23S spacer region digested with HpaII enzyme. Restriction fragment length polymorphism analysis of nitroreductase and rhodonase-like genes using digestion with HincII endonuclease revealed that all ‘Ca. P. mali’ strains belonged to the subtype AP-15. Analysis of rpl22 and rps3 ribosomal protein genes digested with AluI enzyme resulted in classification of detected phytoplasma strains to rpX-A subgroup.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 5; 181-188
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cechy i wskaźniki zróżnicowania lasów różnowiekowych w różnych stadiach rozwoju
    Characteristics and indicators of uneven-aged forest diversity at different developmental stages
    Autorzy:
    Poznański, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1013549.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    metody obliczen
    drzewostany roznowiekowe
    zroznicowanie
    lesnictwo
    stadia rozwojowe
    wskazniki zroznicowania
    characteristics and indicators of forest diversity in natural convention
    uneven−aged forests
    developmental stages
    Opis:
    The paper presents the results of assessment of the characteristics and indicators of uneven−aged forest diversity based on natural convention for different stages of development. The assessed characteristics and indicators included: the average diameter at breast height, natural self−thinning of trees, relative and real stocking and the variation in dbh distribution structure.
    Źródło:
    Sylwan; 2008, 152, 09; 21-30
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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