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    Tytuł:
    Ontogenetic development of storied ray pattern in cambium of Hippophae rhamnoides L.
    Autorzy:
    Myskow, E
    Zagorska-Marek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/58338.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    storied ray
    cambium
    plant development
    storied pattern
    Hippophae rhamnoides
    morphology
    ray
    Opis:
    Storied pattern, in the arrangement of both fusiform initials and the rays in cambium of Hippophae rhamnoides, develops in ontogeny relatively quickly and becomes clearly visible in terminal parenchyma of third and fourth annual ring. At first, anticlinal longitudinal divisions and restricted intrusive growth of fusiform initials lead to the formation of their characteristic horizontal tiers. Then, initiation of secondary rays, taking place rather within such tiers, not between them, makes possible the formation of storied ray pattern. New secondary rays originate most frequently from fusiform initials by their segmentation. This makes the appearance of ray tiers rather quick. However, the high order in the structure of cambium of Hippophae rhamnoides is also due to another, very curious and not known until now mechanism. It operates through limited in its range, thus highly controlled, vertical migration of rays on the cambial surface. This applies to asymmetrically positioned rays either primary, which are often originally sited "out of order" or secondary, initiated off-centre within the existing tiers. Excessively asymmetric rays, lying accidentally on the border between two neighbouring storeys, often undergo splitting and then the derivative rays move toward the centres of the storeys. Ray displacement is due to elimination of one or two of ray initial cells on one edge of the ray and simultaneous, multiple divisions adding new ray cells on the opposite edge.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2004, 73, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The significance of gamma-and lambda-dislocations in transient states of phyllotaxis: how to get more from less - sometimes
    Autorzy:
    Zagorska-Marek, B.
    Szpak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/59112.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    In some plants, developmental changes of phyllotaxis are so frequent that the whole spectrum of phyllotactic patterns becomes available for investigation and thus many unknown subtleties of phyllotaxis come to light. Among these, Magnolia acuminata is the most prominent. In a series of experiments performed in silico with application of a simple geometric model of phyllotaxis, we were able to confront the empirical data on phyllotactic transitions occurring in magnolia flowers with the results of computer simulations. They revealed that in addition to the ratio between the sizes of plant organs, the history of developing pattern was also important, especially for the direction of ontogenetic changes. The parameters of size tolerance and vertical tolerance in positioning a new element in the first available space, brought the effects of simulations closer to the real patterns. They helped especially to resolve the enigma of multiplication of parastichies (γ-dislocations) observed sometimes during determined growth of magnolia floral axes. We conclude that ontogenetic changes in phyllotaxis result mainly from changing sizes of organs in the course of development and that the changes do not always occur with mathematical accuracy.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geometric parameters of the apical meristem and the quality of phyllotactic patterns in Magnolia flowers
    Autorzy:
    Wiss, D.
    Zagorska-Marek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/56546.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    geometrical parameter
    apical meristem
    quality
    phyllotactic pattern
    Magnolia
    flower
    phyllotaxis
    plant development
    primordium
    meristem
    Opis:
    The ratio of primordium size to the meristem size (P/M ratio) is regarded by some geometrical models of phyllotaxis as the parameter, which determines the quality of spiral and whorled patterns of lateral organ arrangement. This assumption was tested on floral meristems in four genets representing four Magnolia taxa: M. × salicifolia, M. stellata, M. denudata and M. acuminata. In successive zones of Magnolia flower, lateral organs are initiated in specific phyllotactic patterns and at specific values of the meristem and primordia sizes. The elements of perianth, usually positioned in three trimerous whorls, are initiated as large primordia on relatively small meristem. The switch in the identity of primordia, from tepals to stamens is accompanied by an abrupt increase in the size of the meristem and decrease in the primordia size. Small values of P/M ratio and frequent occurrence of qualitative transformations of phyllotaxis contribute to the exceptionally rich spectrum of spiral patterns in androecium zone. New spiral patterns emerge when bigger primordia of carpels are initiated on the meristem, which at the same time starts diminishing in size either abruptly (M. × salicifolia, M. stellata, M. acuminata) or slowly (M. denudata). Spiral patterns identified in gynoecia have lower numbers of parastichies than the patterns of androecia and occur in frequencies specific for the genet. Although noted ranges of the meristem and primordia sizes, justify the occurrence of phyllotactic patterns observed in successive zones of Magnolia flower, they do not explain genet-specific frequencies of the patterns observed in gynoecium zone. The lack of straightforward relationship between frequency of the patterns and P/M ratio in gynoecium suggests that more complex geometrical factors or factors of non-geometrical nature are engaged in determination of Magnolia floral phyllotaxis.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2012, 81, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of the ray pattern in cambium of Diospyros lotus
    Autorzy:
    Myskow, E.
    Zagorska-Marek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/41766.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Opis:
    Cambial rays, give rise to phloem and xylem rays. This way they affect the efficiency of a radial conducting system in a tree. Both, frequency of rays and their arrangement on the expanding cambial surface must be precisely controlled during tree ontogeny. The main aim of this research was to analyse the changes in the ray arrangement of Diospyros lotus L. cambium during transition from its nonstoried to double–storied structure. In order to trace the history of cambial ray dynamics, the behaviour of wood rays was followed in successive annual rings. Special attention was paid to developmental events, such as initiation and elimination of rays as well as their splitting and uniting. Moreover, the additions and eliminations of ray cell initials at the both opposite ray margins were followed. The most evident was the initial split of high primary rays into the smaller parts and their subsequent separation concurrent with the increase in cambial girth during the first years of a tree ontogeny. Between the existing rays new secondary rays were initiated by segmentation of fusiform initials. These all developmental events led to the formation of a double-storied pattern. In addition, the recurrent uniting and splitting of rays indicated their permanent rearrangement and the dynamic maintenance of a general pattern. The presented data are discussed in light of the processes occurring in cambial rays that lead to the storied pattern formation, which in turn may affect the mechanical properties of the wood.
    Źródło:
    Dendrobiology; 2013, 69
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phyllotaxis instability - exploring the depths of first available space
    Autorzy:
    Szpak, M.
    Zagorska-Marek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/56528.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    phyllotaxis
    instability
    depth
    available space
    phyllotactic transition
    shoot apical meristem
    plant
    ontogenesis
    Opis:
    The theoretical analysis of the consequences of the phyllotactic pattern being propagated according to the first available space rule has revealed that all monojugate patterns, with the exception of the main Fibonacci pattern, should become developmentally unstable in their low expressions. This fact explains why the main Fibonacci pattern plays the dominant role among other patterns of spiral phyllotaxis. The probability that the pattern becomes unstable varies for different patterns, which likely makes them more or less frequent, and thus easier or more difficult to encounter in nature. The unstable pattern inevitably transforms into another, as the computer simulations show. Theoretically predicted instability of low order phyllotaxis may be treated as one of the causes of natural ontogenetic transitions, occurring in plants. This, however, still does not explain why in nature some patterns with high order of phyllotaxis also change, quite readily one into the other, in shoot apical meristem’s ontogeny.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2011, 80, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signals flowing from mature tissues to shoot apical meristem affect phyllotaxis in coniferous shoot
    Autorzy:
    Banasiak, A
    Zagorska-Marek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/57096.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    mature tissue
    shoot
    apical meristem
    phyllotaxis
    coniferous plant
    auxin
    vascular system
    leaf
    primordium
    Opis:
    Axial homodromy in growing shoots of perennial plants with spiral phyllotaxis is the case when the chirality of phyllotactic pattern does not change in consecutive growth increments of the same axis. In conifers such as Picea or Abies this rule is strictly observed, except for the rare cases of discontinuous phyllotactic transitions. In Torreya, however, the chirality changes, at random, every year. The pattern of primordia packing, executed by vegetative shoot apical meristem (SAM), depends in Torreya on their identity. The primordia of bud scales are initiated in the decussate and those of needles in bijugate spiral pattern. The decussate, achiral i.e. neutral pattern always precedes the formation of new spiral pattern and thus facilitates random selection of its chiral configuration. Periodic change in organ identity cannot itself be responsible for the special behavior of Torreya, because in other conifers it also exists. There is, however, one important difference: in Torreya, when the initiation of bud scales begins at SAM, the distance between differentiated protoxylem and the initiation site gradually increases, while in other conifers it remains constant and small. In Torreya, at this phase of development, the rate of xylem differentiation and the rate of organogenesis become uncoupled. Closer anatomical examination shows that the decussate pattern in a bud scale zone develops slowly suggesting gradual decrease of the putative signal flowing acropetally from differentiated protoxylem, responsible for positioning of primordia. We hypothesize that in the absence of this signal SAM starts acting autonomously, distributing primordia according to their identity only. A constant presence of the signal in other conifers assures the continuation of the same phyllotactic pattern throughout the period of bud scale formation, despite the change in organ identity.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2006, 75, 2; 113-121
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal changes in the degree of symplasmic continuity between the cells of cambial region of Acer pseudoplatanus and Ulmus minor
    Autorzy:
    Sokolowska, K
    Zagorska-Marek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/59005.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    seasonal change
    symplasmic continuity
    symplasmic isolation
    cell
    cambium
    Acer pseudoplatanus
    Ulmus minor
    plasmodesma
    Opis:
    The presence of symplasmic isolation and symplasmic continuity which are functional aspects of cell-to-cell communication, had been studied in cambium of Acer pseudoplatanus and Ulmus minor, with hope that uniqueness of this meristem, exemplified by its morphology and seasonal variations in its activity is also manifested in differences in the efficiency of communication between cambial cells during the year. The degree of symplasmic continuity was estimated by loading the fluorescent symplasmic tracer to the stem and following its distribution in a population of cambial cells observed on tangential, transverse and radial sections. In active cambium the tracer did not enter the rays. This suggested that the ray and fusiform cells, growing and dividing intensively at different rates were specifically isolated from each other. In the state of dormancy the tracer was present also in the rays implying continuity between the two types of cambial cells. Temporal restriction in tracer spreading from secondary xylem to cambial region was observed on transverse sections in both physiological states of the meristem. Higher degree of symplasmic isolation in active cambium is, most probably, associated with functional distinctiveness of ray and fusiform cells. We hypothesize further that the symplasmic continuity in dormant cambium results from the open conformation states of plasmodesmata, because the energy costs of these states are low. It is reasonable strategy when cambial cells do not divide and maintenance of their functional individuality is not necessary.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2007, 76, 4; 277-286
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected problems of protecting and managing historical ruins in Poland
    Autorzy:
    Fortuna-Marek, A.
    Szmygin, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/389978.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    historical ruins
    management of the ruins
    development of the ruins
    Opis:
    Historical ruins have long been the object of interest for the research –workers of various disciplines as well as the conservators of historical monuments. The main problem is the form of protection. The standard of protecting ruins in the so-called permanent ruin form was elaborated two centuries ago, however, it is still the subject of numerous discussions, conferences, scientific-research works. The main source of doubts as to the permanent ruin is its incompleteness,(deficiency) illegibility and the highly restricted possibilities of making any use of it, whereas the contemporary protection of monuments assumes their accessibility and the widest possible use for contemporary functions. That is why the main issue in contemporary maintenance of historical ruins is to ensure them a proper management system. The problem of protecting historical ruins has universal character. In Poland it concerns the resources of about 200 historical ruins, first and foremost of the mediaeval castles. That is why the Polish conservator circles have intensified the works aiming at the solution of the problem through the organization of programs, projects and conferences. A highly estimated result of those efforts is a programmatic document entitled “The Protection Charter of Historical Ruins”. It comprises a set of rules that determine the form of maintenance of historical ruins. However, the issues of management, development and use of the historical ruins still await a solution.
    Źródło:
    Budownictwo i Architektura; 2017, 16, 4; 181-194
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An overview of heat transfer enhancement based upon nanoparticles influenced by induced magnetic field with slip condition via finite element strategy
    Autorzy:
    Hafeez, Muhammad B.
    Krawczuk, Marek
    Shahzad, Hasan
    Powiązania:
    https://bibliotekanauki.pl/articles/2105987.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    magnetohydrodynamic flow
    porous medium
    nanofluids
    heat transfer
    thermal performance
    convective boundary conditions
    FEM
    Opis:
    The mathematical model of heat generation and dissipation during thermal energy transmission employing nanoparticles in a Newtonian medium is investigated. Dimensionless boundary layer equations with correlations for titanium dioxide, copper oxide, and aluminium oxide are solved by the finite element method. Parameters are varied to analyze their impact on the flow fields. Various numerical experiments are performed consecutively to explore the phenomenon of thermal performance of the combination fluid. A remarkable enhancement in thermal performance is noticed when solid structures are dispersed in the working fluid. The Biot number determines the convective nature of the boundary. When the Biot number is increased, the fluid temperature decreases significantly. Among copper oxide, aluminium oxide, and titanium oxide nanoparticles, copper oxide nanoparticles are found to be the most effective thermal enhancers.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 3; 200--206
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polychlorinated biphenyls in the tissues of Antarctic marine migratory birds and penguins from the breeding colony on King George Island (South Shetland Islands)
    Autorzy:
    Łukowski, Aleksy B.
    Karolewski, Marek A.
    Górski, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2053267.pdf
    Data publikacji:
    1987
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctica
    South Shetland Islands
    PCBs contents
    penguins
    migratory birds
    Źródło:
    Polish Polar Research; 1987, 8, 2; 179-187
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residues of chlorinated hydrocarbons in the adipose tissue of the Antarctic pinnipeds
    Autorzy:
    Karolewski, Marek A.
    Łukowski, Aleksy B.
    Halba, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/2053271.pdf
    Data publikacji:
    1987
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctica
    Pinnipedia
    chlorinated hydrocarbons
    Źródło:
    Polish Polar Research; 1987, 8, 2; 189-197
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of renewable energy sources in the Northern Black Sea Coast
    Rozwój odnawialnych źródeł energii w północnym wybrzeżu Morza Czarnego
    Autorzy:
    Mitryasova, O.
    Marek, A.
    Pohrebennyk, V.
    Łapczyńska-Kordon, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/93735.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    renewable energy sources
    policy
    energy safety
    odnawialne źródła energii
    polityka
    bezpieczeństwo energetyczne
    Opis:
    The objective of the study was to analyse the policy and economy of renewable energy sources development in the Northern Black Sea Coast of Ukraine. Presently the share of the renewable energy resources in the power balance of Ukraine is rather small, namely 0.3% of the general development of the electric power. Nevertheless, Ukraine has huge potential with this regard. The accepted power strategy of Ukraine till 2020 has to play an important role. The potential of renewable energy sources in Ukraine makes 113 million tons of equivalent fuel whereas taking into consideration the modern level of production, traditional energy sources can provide Ukraine with 68 million tons of equivalent fuel with fuel and energy resources. The required theoretical level of the research included the use of analysis, comparison and synthesis. The analysis of the alternative energy development, which aims at experience and forecast of possible ways of development has given the opportunity to obtain the result of the research within vertical (historical) and horizontal (functional) scopes. In the southern regions of the country the investment projects aiming at the creation of power plants, working with sun and wind energy are actively carried out. The Northern Black Sea Coast of Ukraine is the most suitable region for development of this branch of alternative power engineering.
    Celem pracy jest przedstawienie polityki i gospodarki na rzecz rozwoju odnawialnych źródeł energii na północnym wybrzeżu Morza Czarnego na Ukrainie. Obecnie udział odnawialnych źródeł energii w bilansie energii Ukrainy jest niewielki i stanowi tylko 0,3% ogólnego potencjału energetyki konwencjonalnej. Niemniej jednak Ukraina posiada ogromny potencjał w odnawialnych źródłach energii. Przyjęta strategia udziału OZE w bilansie energetycznym Ukrainy do 2020 roku ma do odegrania ważną rolę. Potencjał odnawialnych źródeł energii na Ukrainie oceniany jest na poziomie 113 mln ton paliwa umownego, natomiast biorąc pod uwagę nowoczesny poziom produkcji, źródła tradycyjne są w stanie dostarczyć Ukrainie 68 mln ton paliwa umownego w postaci zasobów paliw i energii. W celu spełnienia wymagań związanych z poziom teoretycznym badań zastosowano metodę analizy, porównania i syntezy. Analiza rozwoju alternatywnych źródeł energii, której celem było doświadczenie i prognoza możliwych sposobów rozwoju umożliwiła uzyskania wyniku badania w zakresie pionowym (historycznym) i poziomym (funkcjonalnym). W południowych regionach kraju projekty inwestycyjne ukierunkowane na budowę elektrowni, pracę z energią słoneczną i wiatrową są aktywnie realizowane. Północne wybrzeże Morza Czarnego na Ukrainie jest najbardziej odpowiednim obszarem dla rozwoju tej gałęzi energetyki alternatywnej.
    Źródło:
    Agricultural Engineering; 2014, 18, 3; 105-110
    2083-1587
    Pojawia się w:
    Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of 22Cr25NiWCoCu Austenitic Stainless Steel After Ageing
    Autorzy:
    Sroka, Marek
    Zieliński, A.
    Puszczało, T.
    Sówka, K.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048810.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    22Cr25NiWCoCu steel
    microstructure
    precipitates
    ageing
    Opis:
    The 22Cr25NiWCoCu austenitic stainless steel was developed by AB Sandvik Material Technology in Sweden. Due to its high creep strength and good corrosion resistance, this material is well suited for use in superheaters in advanced coal-fired power boilers as well as in other types of steam boilers using various types of fuel. The examined material was subject to long-term ageing for the time of annealing up to 20 000 h at 700 and 750°C. Precipitation processes and microstructure stability as-received and after ageing were investigated. Examination of the microstructure was conducted using scanning electron microscopy. The identification of secondary phases was carried out by X-ray phase composition. Using the results of the investigations of precipitation processes in the microstructure, both within the grains and at the grain boundaries, their statistical analysis was carried out. To illustrate this impact, the following parameters were used: surface area and equivalent diameter of precipitates. Based on the surface area measurements, the percentage of the phase in the reviewed photo’s total area was calculated.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 175-180
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Constraints on variation of weight-shifting by foot during walking in adolescents with valgus alignment of hallux
    Autorzy:
    Latour, Ewa
    Arlet, Jarosław
    Latour, Marek
    Dworak, Lechosław B.
    Bohatyrewicz, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/27324136.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    walking
    body mass index
    motor control
    hallux valgus
    pieszy
    wskaźnik masy ciała
    kontrola silnika
    paluch koślawy
    Opis:
    Purpose: Etiology of hallux valgus (HV) remains unclear and effective treatments and prophylaxis for this condition are lacking and conclusions of researches concerning HV are inconsistent. Recognition of the function-structure interrelation in foot at the early stage of valgus alignment of first metatarsophalangeus joint (1stMTPJ) would help explain the etiology of HV. Methods: The frequency of weight-shifting patterns during walking and the body mass index (BMI) were assessed relative to goniometric measurements of the 1stMTPJ angle in adolescents. Weight-shifting patterns were identified with a plantar pressure analysis, performed with the GaitlineMaxline Distance method. Results: As the 1stMTPJ angle widened, the frequency distributions of identified weight-shifting patterns became increasingly lopsided, due to the favoring or disfavoring of one pattern at the expense of the other. The two sexes showed opposite trends in the weight-shifting patterns that were favored/disfavored, relative to participants with a 0º 1stMTPJ angle. The clear predominance of a central-shift pattern, at the expense of a medial-shift, occurred with the largest (20º) 1stMTPJ angle among girls. Additionally, the BMI distributions associated with 1stMTPJ angle characteristics showed opposite trends between the sexes. Conclusions: Valgus alignment of 1stMTPJ among adolescents were associated with limitations in weight-shifting freedom of the foot during walking, that could be involved in maintaining balance. An 1stMTPJ angle of 20º, where distinct limitations were observed, might serve as a criterion of HV pathology.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 3; 95--104
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison between thr G-banded karyotype of the aoudad [Ammotragus lervia] and sheep [Ovis aries]
    Autorzy:
    Slota, E
    Kozubska-Sobocinska, A.
    Bugno, M.
    Giemza-Marek, A.
    Kulig, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041924.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ovis aries
    animal production
    sheep
    Ammotragus lervia
    comparative cytogenetics
    karyotype
    aoudad
    Źródło:
    Journal of Applied Genetics; 2001, 42, 1; 59-64
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytoplankton and suspensions in relation to the freshwater in Arctic coastal marine ecosystems
    Autorzy:
    Wiktor, Józef
    Węsławski, Jan Marcin
    Wieczorek, Piotr
    Zajączkowski, Marek
    Okolodkov, Yuri B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2052462.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    brackish waters
    phytoplankton
    Źródło:
    Polish Polar Research; 1998, 19, 3-4; 219-234
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy Constraints and Optimal Development of the Polish Economy
    Ograniczenie energetyczne a optymalny rozwój gospodarki Polski
    Autorzy:
    Gajda, Jan B
    Miszczyńska, Dorota
    Miszczyński, Marek
    Tomaszewicz, Łucja
    Zieliński, Jerzy S
    Powiązania:
    https://bibliotekanauki.pl/articles/904820.pdf
    Data publikacji:
    1986
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Opis:
    The study is sponsored by the Institute of Energetics under the Grant PR-8.
    Przy konstrukcji prezentowanego modelu za główne ograniczenie rozwoju gospodarczego przyjmuje się zasoby paliwowo-energetyczne. Dalszymi ograniczeniami są możliwości produkcyjne, importowe, a także znaczna sztywność struktury produkcji uwarunkowana strukturą kapitału. Opis powiązań pomiędzy działami gospodarki narodowej ma postać modelu input- output wyróżniającego 14 działów, w tym 3 energetyczne.
    Źródło:
    Acta Universitatis Lodziensis. Folia Oeconomica; 1986, 54
    0208-6018
    2353-7663
    Pojawia się w:
    Acta Universitatis Lodziensis. Folia Oeconomica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studia z dziejów Polski i Europy w XIX i XX wieku : księga dedykowana profesorowi Piotrowi Stefanowi Wandyczowi
    Autorzy:
    Biskupski, Mieczysław B.
    Współwytwórcy:
    Faryś, Janusz (1939- ). Redakcja
    Nir, Roman (1940- ). Redakcja
    Szczerbiński Marek. Redakcja
    Data publikacji:
    2004
    Wydawca:
    Gorzów Wlkp. [Wielkopolski] : Zamiejscowy Wydział Kultury Fizycznej Poznańskiej AWF [Akademii Wychowania Fizycznego]
    Tematy:
    Wandycz, Piotr S.
    Wandycz Piotr S. (1923- ) księga pamiątkowa
    Opis:
    Nazwy aut. na s. 641-644. Nazwa wydawcy w cop. --- Tekst częśc. ang.
    Bibliogr. przy pracach., bibliogr. prac. P. S. Wandycza s. 13-30.
    Dostawca treści:
    Bibliografia CBW
    Książka
    Tytuł:
    Non-invasive haemodynamic assessments among hypertensive patients in a routine family doctor’s office
    Autorzy:
    Trzeciak, B.G.
    Gutknecht, P.
    Marek-Trzonkowska, N.
    Molisz, A.
    Czaja, R.
    Siebert, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/28761831.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2022, 29, 2; 264-268
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Method of Copper Powder Synthesis on Rotating Electrode in the Presence of Surfactants
    Autorzy:
    Wojtaszek, K.
    Cebula, F.
    Partyka, B.
    Deszcz, P.
    Włoch, G.
    Socha, R. P.
    Woźny, K.
    Żabiński, Piotr
    Wojnicki, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2203711.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper powder
    electrochemical synthesis
    rotating electrode
    ethylene glycol
    Opis:
    This paper presents a method of synthesizing copper powders by electrochemical method with the use of a rotating working electrode. The influence of the rotation speed of the working electrode, the current density, the concentration of copper ions, and the addition of ethylene glycol on the shape, size, and size distribution of the obtained powders were investigated. Properties of the synthesized powders were characterized by scanning electron microscopy (SEM) and X-ray powder diffractometry (XRD). It has been shown that it is possible to obtain copper powders with a size of 1 µm by an electrochemical method using the rotary cathode, in sulphate bath with addition of ethylene glycol as a surfactant. Increasing current density causes a decrease in the average size of the obtained powder particles. The addition of 2.5% of ethylene glycol prevents the formation of dendritic powders. The change in the concentration of copper ions in the range from 0.01 to 0.15 mol/dm3 in the electrolyte did not show any significant effect on the size of obtained particles. However, higher concentrations of copper limiting the presence of dendritic-shape particles. Changing the speed of rotation of the electrode affects both the size and the shape of synthesized copper powder. For the rotational speed of the electrode of 115 rpm, the obtained powders have a size distribution in the range of 0-3 µm and an average particle size of 1 µm. The particles had a polygonal shape with an agglomeration tendency.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 375--386
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conductance Fluctuations in Microstructures of HgCdMnTe Bicrystals
    Autorzy:
    Grabecki, G.
    Lenard, A.
    Plesiewicz, W.
    Jaroszyński, J.
    Cieplak, Marek
    Skośkiewicz, T.
    Dietl, T.
    Kamińska, E.
    Piotrowska, A.
    Bulka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890700.pdf
    Data publikacji:
    1991-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Lq
    Opis:
    Microscopic four-contact probes to semimagnetic HgCdMnTe grain-boundary inversion layers have been photolithographically patterned. Magnetoresistance measurements performed on these samples revealed aperiodic conductance fluctuations of the magnitude of the order of e$\text{}^{2}$/h. Quantitative analysis of both fluctuation amplitude and their mean period indicate that we have approached the mesoscopic regime in our system. This opens new possibilities in studies of spin-subsystem dynamics in semimagnetic semiconductors.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 2; 307-310
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Biological Properties of the Soil in a Burnt-Out Area under Old Pine Trees Three Years after an Fire
    Wybrane właściwości biologiczne gleby na wypalonym obszarze pod starodrzewami sosny trzy lata po pożarze
    Autorzy:
    Olejniczak, Izabella
    Górska, Ewa B.
    Prędecka, Anna
    Hewelke, Edyta
    Gozdowski, Dariusz
    Korc, Marian
    Panek, Ewa
    Tyburski, Łukasz
    Skawińska, Monika
    Oktaba, Izabella
    Boniecki, Paweł
    Kondras, Marek
    Oktaba, Lidia
    Powiązania:
    https://bibliotekanauki.pl/articles/1812053.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    soil microorganisms
    soil mesofauna
    fire
    Brunic Arenosol
    forest soil
    mikroorganizmy glebowe
    mezofauna glebowa
    pożar
    gleba leśna
    Opis:
    Fires, on account of their emotional, economic and cognitive aspects, are of interest to numerous researchers, and their impact is often unpredictable and difficult to investigate. They are among some of the most dynamic factors shaping terrestrial ecosystems. They destroy vegetation and alter the physicochemical and biological properties of the soil. Fires significantly influence the abundance and biodiversity of soil microorganisms and soil mesofauna, which are important elements of soils of every ecosystem, especially forest soils. Restoration of communities of soil organisms takes place at different rates and depends on, among other things, the intensity of the fire. The aim of the research was to determine the degree of restoration of the abundance of microorganisms and mesofauna in areas burnt out by anthropogenic fires of different intensity in an old pine forest. The research was conducted in a two-hundred-year-old pine stand (Peucedano-Pinetum), in the Kampinos National Park (near Warsaw, central Poland). In August 2018, three years after the fires, 3 test areas (10×10 m) were designated on each burnt-out site: after a weak fire (W) and after a strong fire (S), and also in adjacent unburnt (control, C) areas. In each test area, 6 samples were taken both from the organic layer (0-5 cm) and the mineral layer (5-25 cm – for microorganisms, and 5-10 cm for mesofauna) of the soil using standard methods for microorganisms and mesofauna. It was found that three years after the fires, the restoration of communities of soil organisms in terms of numbers was at an advanced stage (this was especially true for soil mesofauna). Based on the PCA analysis, it was found that the restoration of microbial communities and of the communities of mesofauna were interrelated, which was also influenced by the environmental conditions of the soils after the fires, in particular the physico-chemical soil properties resulting from the intensity of the fire.
    Pożary, ze względu na emocjonalne, ekonomiczne i poznawcze aspekty, są przedmiotem zainteresowań licznych badaczy, a ich wpływ często jest nieprzewidywalny i trudny do zbadania. Należą do jednych z najbardziej dynamicznych czynników kształtujących ekosystemy lądowe. Niszczą roślinność, zmieniają fizykochemiczne i biologiczne właściwości gleby. Pożary w istotny sposób kształtują liczebność i bioróżnorodność mikroorganizmów glebowych i mezofauny glebowej, będących istotnymi elementami gleb każdego ekosystemu, zwłaszcza gleb leśnych. Odbudowa zespołów organizmów glebowych zachodzi w różnym tempie i zależy między innymi od siły pożaru. Celem badań było ustalenie stopnia odbudowy liczebności mikroorganizmów i mezofauny w obszarach wypalonych po pożarach antropogenicznych o różnej sile w starodrzewie sosnowym. Badania prowadzono w dwustuletnim drzewostanie sosnowym (Peucedano-Pinetum), w Kampinoskim Parku Narodowym (koło Warszawy, centralna Polska). W sierpniu 2018, trzy lata po pożarach wyznaczono po 3 powierzchnie badawcze (10x10 m) na pożarzyskach: po słabym pożarze (W) i mocnym pożarze (S) oraz przyległych obszarach niewypalonych (kontrolnych, C). Na każdej powierzchni badawczej pobierano po 6 prób w warstwie organicznej (0-5 cm) i mineralnej gleby (5-25 cm – w przypadku mikroorganizmów i 5-10 cm w przypadku mezofauny) stosując standardowe metody dla mikroorganizmów i mezofauny. Stwierdzono, że po trzech latach po pożarze odbudowa zespołów organizmów glebowych pod względem liczebności jest w dużym stopniu zaawansowana (dotyczy to zwłaszcza mezofauny glebowej). Na podstawie analizy PCA stwierdzono, że odbudowa zespołów mezofauny i mikroorganizmów są powiązane ze sobą, na co mają wpływ także warunki środowiskowe gleb po pożarze, zwłaszcza właściwości fizykochemiczne gleby, wynikające z siły pożaru.
    Źródło:
    Rocznik Ochrona Środowiska; 2019, Tom 21, cz. 2; 1279-1293
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical problems for introductory electrical engineering
    Autorzy:
    Makal, Jarosław
    Alinejad, Aria
    Lundheim, Lars
    Bolstad, Torstein
    Tybell, Thomas
    Hardeberg Zimmermann, Pauline
    Białostocka, Anna
    Choroszucho, Agnieszka
    Forenc, Jarosław
    Karpiuk, Andrzej
    Sierocka, Honorata
    Steckiewicz, Adam
    Gajić, Bojana
    Raičević,, Nebojša B.
    Suproniuk, Marek
    Powiązania:
    https://bibliotekanauki.pl/books/2204855.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Opis:
    What makes up a good problem? We will not attempt to give a complete answer to that question. A partial answer is that, for engineering education, it is desirable if a problem in some sense is practical. It should, if possible, relate to the students’ previous experience, connect to applications that the student knows or is about to learn about. Such experienced relevance of the problem might be the spark that inspires an otherwise marginally motivated learner.When selecting problems for this booklet, we have chosen such ones that in our experience have served us well. Several of them have been developed and revised in collaboration with students and learning assistants and have been tried out in courses at our respective institutions. Even though intended learning objectives may be common, the actual syllabus and course construction must always be adapted to local culture, tradition and administrative requirements. A reader may find that some of our suggestions fit well with his or her own way of teaching, others not.
    Dostawca treści:
    Biblioteka Nauki
    Książka
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