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Search Results: 1 - 10 of 210423 matches for " Jaros?aw Pro?ków "
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How really extensive is the original material of Juncus kochii (Juncaceae)? - A taxonomic and nomenclatural revision
Jarosaw Proków
Acta Societatis Botanicorum Poloniae , 2008, DOI: 10.5586/asbp.2008.041
Abstract: The identity of the original material of Juncus kochii F. W. Schultz (Juncaceae) is discussed. The taxon at present is best regarded as Juncus bulbosus L. subsp. kochii (F. W. Schultz) Reichg. The relevant literature (protologue and references therein) was searched and details of all original elements were compiled. Nomenclatural and taxonomic remarks are given. Juncus welwitschii Hochst. ex Steud. is here excluded as a synonym of Juncus bulbosus subsp. kochii.
Juncus bulbosus (Juncaceae), a species new to South America (Chile)
Jarosaw Proków
Acta Societatis Botanicorum Poloniae , 2008, DOI: 10.5586/asbp.2008.028
Abstract: The first localities of Juncus bulbosus (Juncaceae) for South America (Chile) and for the whole south-western part of the world (S latitude and E longitude) are described, including precise geographical location and climatic conditions. General remarks on the invasiveness of the species and on the possibility of finding it in other parts of the world are given. The distribution of the species world-wide requires further studies, since the bulbous rush has become an invasive plant in areas where it did not occur before.
Rejection of some original materia of Juncus kochii (Juncaceae) as useless for typification
Jarosaw Proków
Acta Societatis Botanicorum Poloniae , 2006, DOI: 10.5586/asbp.2006.036
Abstract: The identity of the potential original material of Juncus kochii is discussed. The taxon at present is best regarded as Juncus bulbosus L. subsp. kochii (F.W. Schultz) Reichg. The relevant literature (protologue and references therein) was searched and details of all residual original elements were compiled. Taxonomic remarks are given. The herbarium material from the environs of Bitche (Moselle, Lorraine) and Gérardmer (Vosges, Lorraine) – both in France, has been rejected as useless for typification of J. kochii (because of taxonomic reasons), though it was listed both in the protologue and also as indirect references therein Schultz’s earlier publications.
Preliminary results on allozyme diversity and differentiation of Norway spruce (Picea abies (L.) Karst.) in Poland based on plus tree investigations
Andrzej Lewandowski,Jarosaw Burczyk,W?adys?aw Cha?upka
Acta Societatis Botanicorum Poloniae , 1997, DOI: 10.5586/asbp.1997.025
Abstract: Genetic diversity and genetic differentiation among Polish populations of Norway spruce (Picea abies (L.) Karst.) were studied analyzing allozyme variation at 24 loci. Presented investigations based on 81 clones represented 6 populations from three different regions: Sudety Mts., Beskid Mts. and North-East Poland. On average, the expected heterozygosity was 0.134, 52.8% of loci were polymorphic, and the number of alleles per locus was 1.8. Our data confirm the hypothesis that a lower level of variation of Picea abies exists in central Europe, compared to other regions of its natural distribution. Relatively small allozyme differentiation among regions was observed (Fst =0.027, and Nei's genetic distances ranged from 0.005 to 0.008). Reasons for the low genetic differentiation observed between Southern and Northern populations are briefly discussed.
Ostra niewydolno serca w po ogu - opis przypadku kardiomiopatii oko oporodowej
Magdalena K?osińska,Jarosaw D. Kasprzak,TomaszWaszyrowski,Jarosaw Dro?d?
Polish Journal of Cardiology , 2009,
Abstract: Kardiomiopatia oko oporodowa to rzadka choroba o powa nym rokowaniu. Dotyczy dotychczas zdrowych kobiet w ostatnim miesi cu ci y i wcze-snym okresie poporodowym. Dok adna przyczyna dysfunkcji skurczowej lewej komory nie jest znana. Wskazuje si przede wszystkim na t o zapalne, infekcyjne i autoimmunologiczne. Do typowych objawów klinicznych nale : ma a tolerancja wysi ku, duszno , kaszel, ból w klatce piersiowej i obrz -ki obwodowe. Leczenie kardiomiopatii po ogowej jest podobne do leczenia niewydolno ci serca spowodowanej innymi przyczynami. Szczególn uwag nale y zwróci na bezpieczeństwo leków przenikaj cych przez o ysko i do mleka. G ównym czynnikiem warunkuj cym dobre rokowanie jest normalizacja funkcji serca w ci gu kilku miesi cy po porodzie. U kobiet z utrzymuj c si dysfunkcj lewej komory, ryzyko powik ań w czasie kolejnej ci y jest du e i nale y j zdecydowanie odradza .
The combinatorial part of the cohomology of a singular variety
Donu Arapura,Parsa Bakhtary,Jarosaw W?odarczyk
Mathematics , 2009,
Abstract: We study the first step of the weight filtration on the cohomology of a proper complex algebraic variety, which we call the combinatorial part. We obtain a natural upper bound on its size, which gives rather strong information about the topology of rational singularities.
Weights on cohomology, invariants of singularities, and dual complexes
Donu Arapura,Parsa Bakhtary,Jarosaw W?odarczyk
Mathematics , 2011,
Abstract: In this paper, we extract natural invariants of a singularity by using the Deligne weight filtration on the cohomology of an exceptional fibre of a resolution, and also on the intersection cohomology of the link. Our primary goal is to study and give natural bounds on the weights in terms of direct images of differential forms. These bounds can be made explicit for various standard classes such as rational, isolated normal Cohen-Macaulay and toroidal singularities, and lead to strong restrictions on the topology of these singularities. A secondary goal of this paper is to make the weight filtration, and related constructions, more widely accessible. So we have tried to make the presentation somewhat self contained. This is supersedes our earlier preprint arXiv:0902.4234.
Torification and Factorization of Birational Maps
Dan Abramovich,Kalle Karu,Kenji Matsuki,Jarosaw W?odarczyk
Mathematics , 1999,
Abstract: Building on the work of the fourth author in math.AG/9904074, we prove the weak factorization conjecture for birational maps in characteristic zero: a birational map between complete nonsingular varieties over an algebraically closed field K of characteristic zero is a composite of blowings up and blowings down with smooth centers. Such a factorization exists which is functorial with respect to absolute isomorphisms, and compatible with a normal crossings divisor. The same holds for algebraic and analytic spaces. Another proof of the main theorem by the fourth author appeared in math.AG/9904076.
Spin-Wave Band Structure in 2D Magnonic Crystals with Elliptically Shaped Scattering Centres
S?awomir Mamica,Maciej Krawczyk,Jarosaw Wojciech K?os
Advances in Condensed Matter Physics , 2012, DOI: 10.1155/2012/161387
Abstract: Spin waves in 2D periodic magnetic nanocomposites are studied by means of the plane wave method. The effect of the ellipticity and in-plane rotation of the scattering centers on the band structure is investigated, to indicate new possibilities of fine tuning of spin-wave filter passbands. 1. Introduction Magnetic composites with a structure modulated periodically on the nanoscale are the subject of a very intensive research activity, and the interest in their properties is increasing [1–7]. By analogy to photonic crystals (PCs), they are referred to as magnonic crystals (MCs) [8], since the role of information carriers in these materials is played by magnons, or spin-wave quanta. Magnonic crystals have properties that cannot be reduced to those of their constituent materials, as manifested, among others, by the band structure of their spin-wave spectrum. The periodic structure given to a magnetic composite strictly determines the possible occurrence of magnonic gaps, or energy ranges forbidden to propagating spin waves [9–11]. The anticipated full control over the spin waves propagating in MCs, similar to that of the electromagnetic waves in PCs, combined with a long-term stability of the programmable magnetic state makes MCs excellent for both research and application purposes [12, 13]. Moreover, the wavelength of spin waves is much shorter than that of electromagnetic waves of the same frequency. This provides additional possibilities in the miniaturization of MC-based devices [14–16]. For a broad survey of the current state of both the experimental and theoretical research in MCs and their potential applications, please refer to review papers [17, 18]. The most frequently mentioned of the numerous potential applications of MCs include microwave resonators, magnonic waveguides, spin-wave emitters, and filters [19]. These potential applications, along with the possibility of modeling the energy spectrum of spin-wave excitations propagating in MCs, are the very reason of the intensification of the research on new magnonic materials with so far unknown properties and functionalities [14, 16]. In particular, two-dimensional (2D) MCs with band gaps in the spin-wave spectrum have potential applications in diverse magnonic devices, such as spin-wave filters or switches, or current-controlled delay lines [20]. For example, the latest results of micromagnetic simulations [21] indicate the occurrence of wide magnonic gaps, implying a possible application in spin-wave filters, in 2D Fe/YIG MCs, two-component magnetic composites with iron scattering centers
Funkcja ródb onka w niewydolno ci serca - nowe fakty
Magdalena K?osińska,Jarosaw Dro?d?
Polish Journal of Cardiology , 2005,
Abstract: W ci gu ostatnich kilku lat pojawi o si wiele prac oceniaj cych funkcj ródb onka u osób z niewydolno ci serca. Nieprawid owa funkcja ródb onka wi e si z upo ledzeniem rozkurczu naczyń, co prowadzi do zwi kszenia obci enia nast pczego serca i gorszej perfuzji tkanek. Wci poszukuje si wiarygodnych in vivo i in vitro metod oceny funkcji ródb onka. Ocena liczebno ci kr cych komórek ródb onka i pro-genitorów ródb onka s nowymi metodami badania integralno ci warstwy endotelium. Wykazano zale no mi dzy stwierdzan dysfunkcj ródb onka a wynikami klinicznymi u osób z niewydolno ci serca. Monitorowanie stosowanego leczenia przez ocen wp ywu na funkcj ródb onka nabiera szczególnego znaczenia w procesie terapeutycznym. Poni sza praca stanowi przegl d najnowszych doniesień na wymienione tematy.
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