Search results for: Michał Grabowski

Items from 1 to 20 out of 48 results

article

Lasting through the ice age: The role of the proglacial refugia in the maintenance of genetic diversity, population growth, and high dispersal rate in a widespread freshwater crustacean

Lidia Sworobowicz, Tomasz Mamos, Michał Grabowski, Anna Wysocka

Freshwater Biology > 65 > 6 > 1028 - 1046

The severe climatic changes during the Pleistocene ice ages have shaped the genetic structure and distribution of biota in Europe. We aimed to reveal in detail the genetic diversity, geographical population structure, historical and present demography, migration patterns, and the presence of possible glacial refugia within the nominative subspecies Asellus aquaticus aquaticus. We analysed DNA...

article

Long‐term within‐basin isolation patterns, different conservation units, and interspecific mitochondrial DNA introgression in an amphipod endemic to the ancient Lake Skadar system, Balkan Peninsula

Aleksandra Jabłońska, Weronika Wrzesińska, Andrzej Zawal, Vladimir Pešić, more

Freshwater Biology > 65 > 2 > 209 - 225

Investigation of biodiversity, including genetic diversity within species, is crucial for rational planning of nature conservation and species protection. Endemics or narrow‐ranged taxa, sensitive to alteration of physical and chemical conditions, may serve as local bioindicators. Homoeogammarus scutarensis is an endemic, cold‐adapted amphipod crustacean, inhabiting fragmented spring habitats,...

article

Proces technologiczny precyzyjnej obróbki maszynowej elementów z miedzi beztlenowej o dużych średnicach

Michał Grabowski, Grzegorz Brzeziński, Marek Marczenko, Michał Chudzik, more

Przegląd Mechaniczny > 2019 > nr 12 > 31--35

Opracowanie przedstawia proces technologiczny wytworzenia wysoko precyzyjnych elementów wykonanych z miedzi beztlenowej o średnicach przekraczających 0,5 m. Wymagane przez zamawiającego wartości tolerancji wymiarowych i geometrii kształtu mieściły się w granicach +/-0,01 mm przy zachowaniu chropowatości powierzchni poniżej Ra = 0,8 μm. Podstawowymi kształtami podlegającymi obróbce były części typu:...

article

Contrasting molecular diversity and demography patterns in two intertidal amphipod crustaceans reflect Atlantification of High Arctic

Michał Grabowski, Aleksandra Jabłońska, Agata Weydmann-Zwolicka, Mikhail Gantsevich, more

Marine Biology > 2019 > 166 > 12 > 1-14

The distribution of two common intertidal amphipod species Gammarus oceanicus and Gammarus setosus was studied along the coast of Svalbard Archipelago. Genetic analysis showed geographical homogeneity of G. oceanicus with only one molecular operational taxonomic unit (MOTU) and much higher diversification of G. setosus (5 MOTUs) in the studied area. Only two MOTUs of G. setosus are widespread along...

article

Microsporidian infections in the species complex Gammarus roeselii (Amphipoda) over its geographical range: evidence for both host–parasite co-diversification and recent host shifts

Adrien Quiles, Karolina Bacela-Spychalska, Maria Teixeira, Nicolas Lambin, more

Parasites & Vectors > 2019 > 12 > 1 > 1-20

Background Microsporidians are obligate endoparasites infecting taxonomically diverse hosts. Both vertical (from mother to eggs) and horizontal (between conspecifics or between species) transmission routes are known. While the former may promote co-speciation and host-specificity, the latter may promote shifts between host species. Among aquatic arthropods, freshwater amphipod crustaceans are hosts...

article

Environmental factors affecting water mite assemblages along eucrenon-hypocrenon gradients in Mediterranean karstic springs

Vladimir Pešić, Ana Savić, Aleksandra Jabłońska, Grzegorz Michoński, more

Experimental and Applied Acarology > 2019 > 77 > 4 > 471-486

Springs are often recognized as biodiversity hotspots on the regional scale but at the same time they are among the most endangered freshwater habitats. Water mites are among the aquatic animal groups with highest share of crenobiotic (= spring-dwelling) species and, therefore, are possibly the best indicators of the ecological status of spring habitats. We studied water mites and environmental factors...

article

Survival in northern microrefugia in an endemic Carpathian gammarid (Crustacea: Amphipoda)

Denis Copilaş‐Ciocianu, Alina‐Andreea Zimţa, Michał Grabowski, Adam Petrusek

Zoologica Scripta > 47 > 3 > 357 - 372

Gammarus leopoliensis (Crustacea: Amphipoda) is considered a north‐eastern Carpathian endemic species and therefore can be regarded as an appropriate model for testing the hypothesis of Quaternary glacial survival in northern microrefugia. However, 250 km south, the south‐western Carpathians harbour populations that resemble phenotypically both G. leopoliensis and Gammarus kischineffensis, a similar...

article

Climate change as a possible driver of invasion and differential in HSP70 expression in two genetically distinct populations of the invasive killer shrimp, Dikerogammarus villosus

Kamil Hupało, H. Wolfgang Riss, Michał Grabowski, Jacqueline Thiel, more

Biological Invasions > 2018 > 20 > 8 > 2047-2059

Global climate change is known to affect physiological processes in charge of cellular stress response. That often results in forcing many organisms to shift their biogeographic distribution ranges. It also holds true for euryoecious and highly invasive species like the killer shrimp, Dikerogammarus villosus. In this study we compare the level of response to thermal stress in two genetically diversified...

article

Konstrukcja wraka W-34. Przykład lokalnego wytworu szkutniczego dostosowanego do warunków żeglugi przybrzeżnej w rejonie Zatoki Gdańskiej

Michał Grabowski

Pomorania Antiqua > 2018 > Tom XXVII > s. 295-254

Odkryty w okolicach Gdynii-Redłowa wrak W-34 stanowi przykład niewielkiego frachtowca, wykorzystywanego w przybrzeżnej żegludze po akwenie Zatoki Gdańskiej. Jednostka zbudowana została najprawdopodobniej w jednym z lokalnych warsztatów szkutniczych na przełomie XVII i XVIII w. W konstrukcji wykorzystano drewno dębowe i sosnowe z obszaru Pomorza Gdańskiego. Kadłub wraku wykonano w technice skorupowej,...

article

Evidence for interactions between homocysteine and genistein: insights into stroke risk and potential treatment

Zyta Banecka-Majkutewicz, Leszek Kadziński, Michał Grabowski, Sylwia Bloch, more

Metabolic Brain Disease > 2017 > 32 > 6 > 1855-1860

Elevated plasma homocysteine (2-amino-4-sulfanylbutanoic acid) level is a risk factor for stroke. Moreover, it has been suggested that high levels of homocysteine in the acute phase of an ischemic stroke can predict mortality, especially in stroke patients with the large-vessel atherosclerosis subtype. In clinical studies, supplementation with genistein (5, 7-dihydroxy-3- (4-hydroxyphenyl)-4H-1-benzopyran-4-one)...

article

The killer shrimp, Dikerogammarus villosus, invading European Alpine Lakes: A single main source but independent founder events with an overall loss of genetic diversity

Tomasz Rewicz, Remi Wattier, Thierry Rigaud, Michał Grabowski, more

Freshwater Biology > 62 > 6 > 1036 - 1051

The effects of biological invasions are generally more detrimental in isolated ecosystems than in the interconnected ones and freshwater lakes appear to be particularly fragile. The Ponto‐Caspian freshwater amphipod Dikerogammarus villosus (Pontogammaridae), also known as the killer shrimp, is a highly invasive species that can have significant ecological impacts on receiving ecosystems. It has...

article

Parasites, pathogens and commensals in the “low-impact” non-native amphipod host Gammarus roeselii

Jamie Bojko, Karolina Bącela-Spychalska, Paul D. Stebbing, Alison M. Dunn, more

Parasites & Vectors > 2017 > 10 > 1 > 1-15

Background Whilst vastly understudied, pathogens of non-native species (NNS) are increasingly recognised as important threats to native wildlife. This study builds upon recent recommendations for improved screening for pathogens in NNS by focusing on populations of Gammarus roeselii in Chojna, north-western Poland. At this location, and in other parts of continental Europe, G. roeselii is considered...

article

The model homologue of the partially defective human 5,10-methylenetetrahydrofolate reductase, considered as a risk factor for stroke due to increased homocysteine level, can be protected and reactivated by heat shock proteins

Michał Grabowski, Bogdan Banecki, Leszek Kadziński, Joanna Jakóbkiewicz-Banecka, more

Metabolic Brain Disease > 2016 > 31 > 5 > 1041-1045

The A222 V substitution in the human MTHFR gene product (5,10-methylenetetrahydrofolate reductase) is responsible for a decreased activity of this enzyme. This may cause an increased homocysteine level, considered as a risk factor for arteriosclerosis and stroke. The bacterial homologue of the human enzyme, MetF, has been found to be a useful model in genetic and biochemical studies. The similarity...

chapter

Non-uniformity of dynamic logic

Michał Grabowski

Lecture Notes in Computer Science > Computation Theory > 91-97

Harel proved that the dynamic logic is complete in the class of arithmetical interpretations. The set of natural numbers stands for primitive notion in arithmetical interpretations, i.e. the following condition holds: "there exists a unary relation symbol nat such that for every arithmetical interpretation I, nat_I is the set of natural numbers". It is proved that the completeness is lost...

chapter

On the relative incompleteness of logics for total correctness

Michał Grabowski

Lecture Notes in Computer Science > Logics of Programs > 118-127

It is proved that it does not exist an acceptable /cf.4/ programming language having a sound and relatively complete /in the sense of Cook/ proof system for total correctness. This implies that the result of Clarke, German and Halpern concerning total correctness /cf.[4]/ cannot be essentially strengthened. On the other hand, a chaim $$Q_0 \subseteq Q_1 \subseteq ... \subseteq Q_k \subseteq...

chapter

A Technique for Learning Similarities on Complex Structures with Applications to Extracting Ontologies

Michał Grabowski, Andrzej Szałas

Lecture Notes in Computer Science > Advances in Web Intelligence > Case Studies > 183-189

A general similarity-based algorithm for extracting ontologies from data has been provided in [1]. The algorithm works over arbitrary approximation spaces, modeling notions of similarity and mereological part-of relations (see, e.g., [2, 3, 4, 5]). In the current paper we propose a novel technique of machine learning similarity on tuples on the basis of similarities on attribute domains. The technique...

chapter

Alien Crustaceans Along the Southern and Western Baltic Sea

Krzysztof Jażdżewski, Michał Grabowski

Invading Nature - Springer Series in Invasion Ecology > In the Wrong Place - Alien Marine Crustaceans: Distribution, Biology and Impacts > Alien Faunas by Region > 323-344

A detailed account is given as to when and how alien crustaceans have entered the Baltic Sea, with special emphasis on the regions to south and west. The biogeographic origin of the species, their vectors and arrival pathways, as well as ecological and economic impacts are discussed. Altogether 19 alien crustacean species were hitherto recorded in the south-western Baltic Sea; of which 8 are of Ponto-Caspian...

article

The legacy of a vanished sea: a high level of diversification within a European freshwater amphipod species complex driven by 15 My of Paratethys regression

Tomasz Mamos, Remi Wattier, Artur Burzyński, Michał Grabowski

Molecular Ecology > 25 > 3 > 795 - 810

The formation of continental Europe in the Neogene was due to the regression of the Tethys Ocean and of the Paratethys Sea. The dynamic geology of the area and repetitious transitions between marine and freshwater conditions presented opportunities for the colonization of newly emerging hydrological networks and diversification of aquatic biota. Implementing mitochondrial and nuclear markers in conjunction...

article

Oviposition by selected water mite (Hydrachnidia) species from Lake Skadar and its catchment

Aleksandra Bańkowska, Magdalena Kłosowska, Piotr Gadawski, Grzegorz Michoński, more

Biologia > 2016 > 71 > 9 > 1027-1033

Research on water mites has mainly focused on their ecology, taxonomy and faunistics. Studies on the biology of particular species and their fecundity have been conducted much less often, and there is very little such information from the Balkan Peninsula. The present study attempts to fill in some of the gaps in the existing knowledge upon reproduction of water mites. Female individuals were collected...

article

Numerical Coding of Nominal Data

Zenon Gniazdowski, Michał Grabowski

In this paper, a novel approach for coding nominal data is proposed. For the given nominal data, a rank in a form of complex number is assigned. The proposed method does not lose any information about the attribute and brings other properties previously unknown. The approach based on these knew properties can been used for classification. The analyzed example shows that classification with the use...

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INFONA - science communication portal

Search results for: Michał Grabowski

Lasting through the ice age: The role of the proglacial refugia in the maintenance of genetic diversity, population growth, and high dispersal rate in a widespread freshwater crustacean

Long‐term within‐basin isolation patterns, different conservation units, and interspecific mitochondrial DNA introgression in an amphipod endemic to the ancient Lake Skadar system, Balkan Peninsula

Proces technologiczny precyzyjnej obróbki maszynowej elementów z miedzi beztlenowej o dużych średnicach

Contrasting molecular diversity and demography patterns in two intertidal amphipod crustaceans reflect Atlantification of High Arctic

Microsporidian infections in the species complex Gammarus roeselii (Amphipoda) over its geographical range: evidence for both host–parasite co-diversification and recent host shifts

Environmental factors affecting water mite assemblages along eucrenon-hypocrenon gradients in Mediterranean karstic springs

Survival in northern microrefugia in an endemic Carpathian gammarid (Crustacea: Amphipoda)

Climate change as a possible driver of invasion and differential in HSP70 expression in two genetically distinct populations of the invasive killer shrimp, Dikerogammarus villosus

Konstrukcja wraka W-34. Przykład lokalnego wytworu szkutniczego dostosowanego do warunków żeglugi przybrzeżnej w rejonie Zatoki Gdańskiej

Evidence for interactions between homocysteine and genistein: insights into stroke risk and potential treatment

The killer shrimp, Dikerogammarus villosus, invading European Alpine Lakes: A single main source but independent founder events with an overall loss of genetic diversity

Parasites, pathogens and commensals in the “low-impact” non-native amphipod host Gammarus roeselii

The model homologue of the partially defective human 5,10-methylenetetrahydrofolate reductase, considered as a risk factor for stroke due to increased homocysteine level, can be protected and reactivated by heat shock proteins

Non-uniformity of dynamic logic

On the relative incompleteness of logics for total correctness

A Technique for Learning Similarities on Complex Structures with Applications to Extracting Ontologies

Alien Crustaceans Along the Southern and Western Baltic Sea

The legacy of a vanished sea: a high level of diversification within a European freshwater amphipod species complex driven by 15 My of Paratethys regression

Oviposition by selected water mite (Hydrachnidia) species from Lake Skadar and its catchment

Numerical Coding of Nominal Data

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