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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:
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:
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:
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:
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:
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:
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:
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:
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
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:
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:
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:
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:
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
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