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    Wyświetlanie 1-7 z 7
    Tytuł:
    What to divide leaves into ten parts for? The proposition of shape indices of leaf blade
    Autorzy:
    Meissner, W
    Zolkos, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/41355.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    leaf blade
    roundness index
    asymmetry index
    leaf blade measurement
    statistical method
    Opis:
    In this paper the method of creating indices for description leaf blade roundness and asymmetry, based on division of the leaf into 10 equal parts perpendicularly to the long axis was proposed. Along each division line the distance between the midrib and the leaf edge was measured separately for the left and right site of the blade. Sum of all 18 measurements, 9 on each side, may be treated as an index of the roundness of the leaf blade. Differences between sums of all measurements of the left and right leaf site could be a base for calculations of various asymmetry indices, including indicators of fluctuating asymmetry. Indices obtained by this method are quite sensitive and may be analysed using standard statistical methods.
    Źródło:
    Dendrobiology; 2008, 60; 29-33
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leaf blade structure and the tolerance of Acer negundo L. (box elder) to the polluted environment
    Autorzy:
    Dineva, S B
    Powiązania:
    https://bibliotekanauki.pl/articles/41089.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    polluted air
    polluted environment
    sulphur dioxide
    stress factor
    box-elder
    Acer negundo
    industrial emission
    environment pollution
    leaf blade structure
    stress tolerance
    Opis:
    Polluted air is a stress factor that contributes to the decline of urban trees. Air pollution may cause short-term (acute) damage, which is immediately visible and long-term (chronic) damage, which can lead to gradual tree decline. Long-term damage may predispose trees to other disorders. The impact of technogenic factors on the leaf’s anatomical structure of Acer negundo L. (Box elder) was studied. The thickness of the upper cuticle is increased when compared to those from an ecologically pure area. A change in the rate of mesophyll tissue is due to the enlargement of the palisade parenchyma. The thickness of lower epidermal cells is decreased. All changes of the leaf blade structure are significant and are in direction of increasing the xerophyte characteristics of the leaves. Box elder is native to much of temperate North America. This is a tree of lowlands and wet hardwood forests. As such, we can assume that the registered changes are adaptive responses of the tree to the contaminated environment and that the tree can be considered to be relatively tolerant.
    Źródło:
    Dendrobiology; 2005, 53; 11-16
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of different concentrations of Kelpak bioregulator on the formation of above-ground biomass cocksfoot
    Autorzy:
    Sosnowski, J.
    Jankowski, K.
    Wiśniewska-Kadżajan, B
    Jankowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/123878.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    orchard
    Kelpak
    biomass
    SPAD index
    leaf blade
    yield
    Opis:
    Studies with growing cocksfoot (cv. Amila) were performed in polyurethane ring with a diameter of 36 cm and a height of 40 cm, which were dug to a depth of 30 cm and filled with soil material. As the experimental factor the trade name of bioregulator Kelpak SL was used, which includes natural plant hormones (auxin and cytokinin). The following aqueous solutions of growth regulator were used: 20, 40, and 60% and control (no preparation). Kelpak were applied to all three regrowth in the form of spray at a dose of 3cm3ring-1 in the shoots elongation phase of the grass. The full use of experimental objects was in 2011-2012. At that time, the detailed study include aboveground biomass yield (g DM•ring-1), leaf length (cm), width of the base of the leaf blade (cm), leaf greenness index (SPAD). On the basis of morphological leaf characters the ratio of leaf blade shaping and the ratio of their surface were calculated. The study showed a significant influence of growth regulator on the development of aboveground biomass of cocksfoot. The greatest effect was obtained with the use of sprays of solutions with a concentration 40 and 60%.
    Źródło:
    Journal of Ecological Engineering; 2013, 14, 1; 48-52
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of the leaf blades of Acer platanoides in industrially contaminated environment
    Autorzy:
    Dineva, S B
    Powiązania:
    https://bibliotekanauki.pl/articles/41665.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Norway maple
    Acer platanoides
    leaf blade
    air pollution
    sulphur dioxide
    environment pollution
    industrial pollution
    industrially contaminated air
    Opis:
    Leaf blades of Norway maple (Acer platanoides L.), growing in heavily polluted industrial area have been studied for anatomical changes developed under the influence of the industrial contamination (with SO2, NxOx, Pb, As). The aim of the examination was to reveal the dynamics in the development of leaf blades and to trace the impact of the contaminated air on the leaf structure of Norway maple. The conducted study registered acceleration of the vegetative growth of the leaf blades that is manifested through approximately two weeks earlier appearance of leaves on the tree, faster linear growth and strengthened the xeromorphic traits in the leaf structure of the tree plants from the contaminated region. The observed changes are regarded as adaptation of the plant to the polluted environment, i.e. as tolerance.
    Źródło:
    Dendrobiology; 2006, 55; 25-32
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and development of the leaf blades of Acer tataricum in industrially contaminated environment
    Autorzy:
    Dineva, S B
    Powiązania:
    https://bibliotekanauki.pl/articles/41080.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Tatarian maple
    Acer tataricum
    air pollution
    sulphur dioxide
    plant growth
    plant development
    vegetation season
    leaf blade
    environment pollution
    gaseous pollution
    Opis:
    During one vegetative season, the growth and the development of the leaf blades of Tatarian maple (Acer tataricum L.) from heavily polluted area has been studied. The region under investigation was contaminated mainly with SO2, NxOx, Pb, Zn, and Cu etc. The aim of the study was to compare the growth and the development of the leaf blades of Acer tataricum L. (Tatarian maple) from polluted field with those from non-polluted. Base on this to assess its tolerance to polluted conditions of the atmosphere, as well as to look for adaptive responses. The conducted study registered shorter time of the vegetative growth of the leaf blades in the commencement stages of the vegetative development. The leaves from polluted site had emergence approximately two weeks earlier compared with these from the control area. Faster linear growth of the leaf surfaces in the commencement stages of the development had been noted for the trees from polluted field. The spongy mesophyll had been reduced, as well as the common thickness of the leaf blades of the tree plants from the contaminated region. The observed changes are regarded as adaptation of the plant to the polluted environment, i.e. as tolerance.
    Źródło:
    Dendrobiology; 2005, 54; 3-10
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fazownik samoczynny z ostrzem napinanym sprężyną piórową
    The self-acting chamfering tool with blade tensioned by leaf spring
    Autorzy:
    Cichosz, P.
    Kowalski, M.
    Karolczak, P.
    Kołodziej, M.
    Skowronek, H.
    Waszczuk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/195852.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    narzędzie skrawające
    fazowanie
    krawędź
    element ślizgowy
    cutting tool
    chamfering
    edge
    sliding element
    Opis:
    Problemem, który może generować znaczne koszty oraz zwiększać czasochłonność procesów technologicznych, są czynności związane z fazowaniem i gratowaniem krawędzi obrobionych wcześniej przedmiotów. Problem ten jest szczególnie istotny w przypadku obróbki masowej, kiedy ważne jest utrzymanie wysokiej efektywności wytwarzania. Dotychczas stosowane narzędzia do fazowania krawędzi, których konstrukcja opiera się na sprężyście umocowanych ostrzach, mają tę wadę, że wielkość i regularność wykonywanej fazy są uzależnione od zakłóceń losowych, np. zmiennych właściwości materiału półfabrykatu. Problem ten nasila się w przypadku kształtowania przedmiotów z materiałów plastycznych lub kompozytowych w obecności nieregularnych wypływek i zadziorów. W pracy omówiono proces konstrukcji i finalną wersję narzędzia do fazowania, wykonanego w wariancie z ostrzem ze zintegrowaną płozą ślizgową i napinanego sprężyną piórową. Omówiono wybrane wyniki fazowania tym narzędziem.
    One of the problems that generate significant costs and increase the time consuming process of the process is the chamfering and deburring the edges of previously machined objects. In the case of mass processing it is particularly important to maintain high efficiency of production. The size and regularity of the made phase subjected to random disturbances such as the variable properties of the material of the semi-finished product are indicated as disadvantages of existing tools for chamfering the edges which design is based on the elastically mounted blades. This problem arises when objects made from plastic or composite materials are machined in the presence of irregular spikes and burrs. This article discusses the construction process and presents the final version of the chamfering tool with a blade with integrated sliding skid tensioned by leaf spring. The selected chamfering results obtained with this tool are discussed.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2017, z. 89 [295], 4; 469-478
    0209-2689
    2300-5211
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The variability of Morus alba L. (Moraceae) leaves in the green areas of Poznan
    Autorzy:
    Kachel, M.
    Nowinska, R.
    Klimko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/790603.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Tematy:
    variability
    Morus alba
    Moraceae
    leaf
    morphology
    white mulberry
    petiole
    blade
    fruit
    taxonomy
    green area
    Poznan city
    Opis:
    The paper presents the results of a biometrical study on the leaves of vegetative and generative shoots of Morus alba. Mature leaves were collected from the green areas of Poznań (Poland) city. Leaves from vegetative shoots were collected from 34 sites. Leaves from generative shoots were collected from specimens with blackish purple or purple fruit (13 trees) and with pale yellow to creamy fruit (21 trees). Eleven morphological traits were analysed in the leaves from vegetative and generative shoots, including the petiole and blade. The seven examined features were characterised by low or moderate variability and four features were characterised by high or very high variability. The research revealed slight differences between trees with blackish purple or pale yellow fruit and significant morphological differences between the leaves of vegetative and generative shoots. The article includes descriptions of quantitative features have not been published in Poland. White mulberry leaves (Morus alba) with white and dark fruit did not make clearly separated groups. Therefore, they should be treated as morphotype of cultivars rather than a distinct taxonomic rank.
    Źródło:
    Steciana; 2017, 21, 1
    1689-653X
    Pojawia się w:
    Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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