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    Wyświetlanie 1-14 z 14
    Tytuł:
    Analysis of hybrid CSA-DEA method for fault detection of cracked structures
    Autorzy:
    Sahu, Sasmita
    Kumar, Priyadarshi Biplab
    Parhi, Dayal R.
    Powiązania:
    https://bibliotekanauki.pl/articles/280405.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    damage
    CSA
    DEA
    hybridisation
    Opis:
    Formation of damage in a structural element often causes failures which is not desirable at all by a maintenance team. Identification of location and severity of damage can aid in taking necessary steps to reduce catastrophic failures of structures. As a result, non-destructive methods of damage detection have gained popularity over the last few years. In this paper, a method of damage detection is proposed to identify the location and severity of damage by hybridising a clonal selection algorithm with a differential evolution algorithm. The inputs to the hybrid system are the relative values of the first three natural frequencies of the damaged structure, and the outputs are relative crack locations and relative crack depths. For training the hybrid system, the natural frequencies are found out using finite element analysis and experimental analysis for different crack locations and crack depths. The test results from the proposed hybrid method are compared with finite element analysis and experimental analysis for validation, and satisfactory outcomes have been observed.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 369-382
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Urban/rural hybrids: the urbanisation of former suburbs (URFSURBS)
    Autorzy:
    Kühne, Olaf
    Powiązania:
    https://bibliotekanauki.pl/articles/1052946.pdf
    Data publikacji:
    2016-12-15
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    suburbia
    urbanisation
    hybridisation
    urban/rural hybrids
    URFSURBS
    Opis:
    In pace with changing social developments, cities undergo regular processes of transformation. Thus, following a temporary preference for suburban living, the inner city has for some years now been enjoying a residential renaissance. A further, as yet little noticed, trend is the urbanisation of former suburbs. Encompassing urbanisation and gentrification processes found in the inner-ring suburbs, this entails a breaking of established dichotomies and the development of hybrid phenomena that can be encapsulated in the acronym URFSURBS: ‘urbanisation of former suburbs’. Focusing on examples from Southern California and Greater Paris, this article places these developments in context and outlines their implications for future research.
    Źródło:
    Quaestiones Geographicae; 2016, 35, 4; 23-34
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An introduction to DNA chips: principles, technology, applications and analysis.
    Autorzy:
    Gabig, Magdalena
    Węgrzyn, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1044090.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    gene expression
    DNA array
    oligonucleotide array
    hybridisation
    Opis:
    This review describes the recently developed GeneChip technology that provides efficient access to genetic information using miniaturised, high-density arrays of DNA or oligonucleotide probes. Such microarrays are powerful tools to study the molecular basis of interactions on a scale that would be impossible using conventional analysis. The recent development of the microarray technology has greatly accelerated the investigation of gene regulation. Arrays are mostly used to identify which genes are turned on or off in a cell or tissue, and also to evaluate the extent of a gene's expression under various conditions. Indeed, this technology has been successfully applied to investigate simultaneous expression of many thousands of genes and to the detection of mutations or polymorphisms, as well as for their mapping and sequencing.
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 3; 615-622
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybridity of a plant created in a combination of crossing of (Vaccinium uliginosum L. × V. vitis-idaea L.) × Oxycoccus macrocarpus (Aiton) Pursh at the tetraploid level
    Autorzy:
    Marozau, Aleh
    Baranov, Oleg Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/2045745.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    consecutive crossing
    DNA markers
    Ericaceae
    hybridisation
    sequencing
    tetraploids
    Opis:
    The aim of the study was to determine the hybridity of the F1 generation of Vaccinium cf. uliginosum × V. vitis-idaea × Oxycoccus macrocarpus created through the consecutive crossing of some common berry species of the family Ericaceae (bog whortleberry, cowberry and marsh cranberry) at the tetraploid level. Certain aspects of phenology and morphometric parameters of vegetative organs of the supposed hybrid and parent plants were analysed using traditional methods of comparative analysis. Molecular genetic assay, including random amplification of polymorphic DNA, simple sequence repeat and sequencing, were also used. Comparison of the phenological and morphometric features of the experimental plant and its parents allows suggesting that in the combination of crossing of (V. uliginosum × V. vitis-idaea) × O. macrocarpus (the cultivar Searles), a three-species hybrid was created. The allelic variants, specific for V. uliginosum, V. vitis-idaea and O. macrocarpus, were detected in the V. cf. uliginosum × V. vitis-idaea × O. macrocarpus genotype. A next-generation sequencing approach is suggested for estimating the share of the genomes of Vaccinium spp. in the formation of the interspecies hybrid.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2018, 60, 4; 281-291
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pour une approche identitaire en traduction : implications socio-culturelles
    Identity approach in translation: sociocultural implications
    Autorzy:
    Żuchelkowska, Alicja
    Powiązania:
    https://bibliotekanauki.pl/articles/1051434.pdf
    Data publikacji:
    2012-01-01
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Translation
    Cultural and linguistic identity
    Cultural and language hybridisation
    Opis:
    The objective of this text consists in presenting how it is necessary for contemporary translators and interpreters (both literary and specialised) to acquire and develop the ability to recognize elements of identity discourse in translated texts. Nowadays, the need for inter-cultural exchange is inevitably connected with the necessity of establishing harmonious co-existence for numerous cultures and identities. Therefore, it is crucial to educate translators in a way that enables them to pay special attention to identity and cultural perturbations present in translated texts (culture and language hybridisation, multiple identity, cultural dislocation, presence in linguistic and political discourse of minority cultures), regardless of their genre or form. Such a strong emphasis on identity problems in the translation is especially relevant in the European context, where the attention of researchers and politicians directed at identity problems stemming from ethnical and cultural issues sets the framework for a new cultural paradigm that determines the future development of the EU. Becoming acquainted with this paradigm which emphasises fluency, identity unmarkedness and the new model of European collectivity is indispensable for a translator aspiring to become a true cultural mediator.
    Źródło:
    Studia Romanica Posnaniensia; 2012, 39, 2; 87-98
    0137-2475
    2084-4158
    Pojawia się w:
    Studia Romanica Posnaniensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    rRNA gene expression and location in triticale assayed by silver staining and in situ hybridisation techniques
    Autorzy:
    Lima-Brito, J.
    Carvalho, A.
    Matos, C.
    Heslop-Harriso, Pat
    Guedes-Pinto, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2198862.pdf
    Data publikacji:
    2005-06-23
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    amphiploids
    in situ hybridisation
    nucleolar dominance
    rDNA
    silver staining
    triticale
    Opis:
    In durum wheat × rye hybrids and the derived amphiploid triticale, AABBRR, the expression of the 1R rRNA genes is largely suppressed. Alloauto-octoploid triticales, AABBRRRR, allows the evaluation if rye NOR inactivation can be overcome by the increase of rye genome number. In the present work, we used silver staining and in situ hybridisation techniques in order to study the nucleolar activity and to localize the rRNA genes in hexaploid and alloauto-octoploid triticales. The use of rye genomic DNA as probe allowed the identification of the rye chromosomes present in both hexaploid and octoploid triticales (14 and 28, respectively). The simultaneous use of the ribosomal sequence enabled the localisation of 18S-25S rDNA on the satellite chromosomes of both triticales. On hexaploid triticale we detected six rDNA sites (four on wheat chromosome pairs 1B and 6B and two on rye chromosome pair 1R), whereas on alloauto-octoploid triticale eight rDNA sites (four on wheat-pairs 1B and 6B and four on rye chromosome pairs 1R) were observed. As expected, the maximum number of active Ag-NORs per metaphase cell was coincident with the maximum number of nucleoli per interphase nucleus confirming that all and only the NORs functionally active during interphase are stained by silver at the next mitotic metaphase. Comparison of the nucleolar activity between hexaploid and octoploid triticales analysed here indicates that the increase in 1R chromosomes from two to four does not change the suppression of rye nucleolar activity. This supports the suggestion that genomic interactions are under strong genetic control.
    Źródło:
    Plant Breeding and Seed Science; 2005, 51; 3-10
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid festivals: Challenges facing Cracow’s festival scene in times of pandemic
    Autorzy:
    Kupis, Marta
    Golemo, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/14765834.pdf
    Data publikacji:
    2022-11-08
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Cracow
    music festivals
    hybridisation
    pandemic
    Kraków
    festiwale muzyczne
    hybrydyzacja
    pandemia
    Opis:
    The main goal of this paper is to show the strategies of dealing with the pandemic circumstances chosen by three of the city’s festivals: EtnoKraków/Crossroads, Sacrum Profanum, and Unsound. Emerging from their diverse approaches is a new hybrid festival formula, which brings with it brand new challenges. These include: new models of interaction between organisers, artists, and audiences; reorganisation of festival space; new patterns of audience accessibility and new forms of exclusion/openness; opportunities and barriers for (virtual) cultural exchange; and finally, a recalibration and blurring of the public and private dimensions brought about by the new types of festival experience. Indeed, it could even be argued that the live event sector is facing significant change in the very concept of “liveness”. The analysis is based both on existing data concerning processes of music festival production and consumption (press articles, reviews, and reports) and semi-structured interviews with artistic directors, managers and producers of the selected festivals, held in 2020/2021.
    Głównym celem niniejszego tekstu jest przedstawienie strategii radzenia sobie z sytuacją pandemiczną wybrane przez trzy krakowskie festiwale: EtnoKraków/Crossroads, Sacrum Profanum i Unsound. Z ich różnorodnych podejść wyłania się nowa, hybrydowa formuła festiwalu, za którą idą zupełnie nowe wyzwania. Wśród nich można wymienić: nowe modele interakcji między organizatorami, artystami i publicznością; reorganizacja przestrzeni festiwalowej; nowe wzory dostępu dla publiczności nowe formy wykluczenia i otwarcia; okazje i bariery dla (wirtualnej) wymiany kulturowej; i wreszcie, nowe typy przeżycia festiwalowego spowodowały zmianę i zatarcie granic między wymiarami publicznym i prywatnym. W rzeczy samej, można nawet twierdzić, że sektor wydarzeń na żywo jest skonfrontowany ze znaczącymi przemianami samego rozumienia pojęcia "żywości". Analiza jest oparta zarówno na danych zastanych dotyczących procesów produkcji i konsumpcji festiwali muzycznych (artykuły prasowe/recenzje, raporty), jak również pół ustrukturyzowanych wywiadach z dyrektorami artystycznymi, menadżerami i producentami wybranych festiwali, przeprowadzonych w 2020/2021.
    Źródło:
    Kultura i Społeczeństwo; 2022, 66, 3; 117-141
    2300-195X
    Pojawia się w:
    Kultura i Społeczeństwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Una nueva mirada desde los límites de lo irreal: la fusión de categorías genéricas en la escritura de la imaginación de Juan Jacinto Muñoz Rengel
    A New Perspective on the Limits of the Unreal: The Fusion of Generic Categories in the Writing of Imagination by Juan Jacinto Muñoz Rengel
    Autorzy:
    Álvarez Méndez, Natalia
    Powiązania:
    https://bibliotekanauki.pl/articles/1048429.pdf
    Data publikacji:
    2018-07-09
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Muñoz Rengel
    hybridisation
    the fantastic
    science fiction
    horror
    magical realism
    Opis:
    Juan Jacinto Muñoz Rengel (1974) is one of the greatest exponents of the hybridization of the fantastic with other non-mimetic modalities and with popular genre narratives. The mestizaje characterizes, through juxtaposition or fusion, much of his work, generating the ultimate significance of a broader scope. The fantastic is intertwined with adjacent categories, including science fiction, terror and magical realism. It is also commonly combined with the historical, detective, adventure or humorous narrative styles. He merges these diverse modes of invention by transgressing the rigid and normative molds with the aspiration of constructing new literary options. The dissolution of frontiers between the fantastic and other neighboring genres is also potentiated with frequent intertextual nods and suggestive tributes to the traditions of the unusual.
    Źródło:
    Studia Romanica Posnaniensia; 2018, 45, 2; 107-120
    0137-2475
    2084-4158
    Pojawia się w:
    Studia Romanica Posnaniensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conversions and Redefinitions – Architecture and Identity of a Place
    Transformacje i redefinicje - architektura i tożsamość miejsca
    Autorzy:
    Sowińska-Heim, Julia
    Powiązania:
    https://bibliotekanauki.pl/articles/593831.pdf
    Data publikacji:
    2013
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    identity
    hybridisation
    architecture
    conversion
    Łódź
    revitalization
    tożsamość
    hybrydyzacja
    architektura
    transformacja
    rewitalizacja
    Opis:
    Architecture substantially strengthens and supports the identity of a city and its citizens. Buildings are the most easily and commonly available testimony to culture. The political transformation which took place in Poland in 1989, causing a shift in the sociocultural order, contributed to an important transformation of the urban areas. New contexts and discourses are being created not only by new edifices, but also by old architecture which is being converted and redefined. Historical buildings are adapted to the changing times, balancing between the past and the present. A new semantic code is forming: old contents are being replaced with new ones, compounding the meanings originally and secondarily given to architecture. Old identities are being questioned and new ones are appearing, which is accompanied by substantial overlapping and hybridisation.
    Architektura w istotny sposób utrwala i podtrzymuje tożsamość miasta i jej mieszkańców. Budynki stanowią najłatwiej i najpowszechniej dostępne świadectwo kultury. Transformacja ustrojowa, która nastąpiła w Polsce w 1989 r., a tym samym zmiana porządku społeczno-kulturowego, doprowadziła również do znaczących przeobrażeń w przestrzeni miejskiej. Nieoczekiwane konteksty i dyskursy tworzone są nie tylko przez nowe realizacje, ale również architek-turę dawną, która poddana zostaje transformacji i redefinicji. Budynki historyczne przystosowują się do zmieniających się czasów balansując pomiędzy przeszłością a teraźniejszością. Następuje zmiana kodu znaczeniowego. Miejsce dawnej zajmuje nowa treść, odczytywana przez nadkładające się kody semantyczne, pierwotnie i wtórnie nadane architekturze. Dochodzi do kwestionowania starych i tworzenia nowych tożsamości ich nakładania i hybrydyzacji.
    Źródło:
    Art Inquiry. Recherches sur les arts; 2013, 15; 191-204
    1641-9278
    Pojawia się w:
    Art Inquiry. Recherches sur les arts
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Location of markers of aluminium tolerance genes on rye chromosomes (Secale cereale L.)
    Autorzy:
    Wiśniewska, Iwona
    Rafalski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2199029.pdf
    Data publikacji:
    2006-06-22
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    aluminium tolerance
    chromosomal location
    DNA-DNA hybridisation
    PCR markers
    wheat/rye addition lines
    Opis:
    The aim of presented work was to identify of PCR amplifiedDNAfragments differentiating aluminium tolerant and sensitive forms of rye and to locate the markers on rye chromosomes. For identification of markers, the PCR system with semi-specific primers targeting intron-exon sequences of plant genes was applied. The modified method of bulked segregant analysis was used. The pooled DNAs of two or three F2 segregating populations were screened together with DNA of their parental inbred lines. Potential marker of tolerance gene was located on rye chromosomes using wheat/rye (Chinese Spring/Blanco) additional lines. The specific probes obtained from DNA fragments differentiating sensitive and tolerant forms of rye were hybridized to PCR amplified DNA fragments of sensitive and tolerant forms of rye and the set of wheat/rye addition lines. Independently of the method of digoxygenin labelling (primer extension or Taq polymerase reaction), the probes obtained showed similar hybridization patterns. The results of hybridisation of 21 probes prepared from 12 DNA fragments confirmed connection of selected DNA fragments with to aluminium tolerance or sensitivity. Most of these DNA fragments originated from tolerant forms of rye. Using this method it was possible to locate eight DNA fragments on rye chromosomes. Three DNA fragments hybridised to chromosome 4R, two DNA fragments to chromosome 6R and single DNA fragments to chromosomes 1R, 2R and 3R. Four DNA fragments indicating clear relationship with character studied were not located on particular chromosomes using this set of wheat/rye addition lines. Hybridisation of probes prepared from four DNA fragments revealed length polymorphism. Probes prepared from two DNA fragments were characterised as dominant markers. In other cases the type of marker (dominant/codominat) was not fully documented.
    Źródło:
    Plant Breeding and Seed Science; 2006, 53; 43-52
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meiotic behaviour and chromosome identification in the Portuguese cultivar of triticale ‘Douro’ using in situ hybridisation
    Autorzy:
    Carvalho, A.
    Guedes-Pinto, H.
    Heslop-Harrison, J. S.
    Lima-Brito, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2198864.pdf
    Data publikacji:
    2005-06-23
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    chromosome identification
    in situ hybridisation
    meiotic pairing
    repetitive DNA clones
    Secale cereale
    triticale
    Opis:
    The wide hybridisation has been applied to cereals breeding allowing to the production of new amphiploids. Triticale (X Triticosecale Wittmack) was the first synthetic amphiploid of the Triticeae tribe and performed well in comparison with its parent’s wheat and rye. In this work we aimed to analyse the meiotic behaviour and to identify the chromosomes present in both mitotic and meiotic metaphase cells of the portuguese cultivar ‘Douro’ (2n=42, AABBRR) using in situ hybridisation technique with genomic DNA from rye and repetitive DNA sequences as probes. Triticale ‘Douro’ presented a high level of homologous pairing. The mean number of bivalents was 20.14 and the average of ring bivalents was higher than rod bivalents. The total frequency of univalents was reduced (1.72), presenting the wheat univalents a higher frequency comparatively to the rye univalents. No multivalent configurations were seen, confirming the high meiotic regularity and stability of triticale ‘Douro’. The simultaneous use of pSc119.2 and pSc250 repetitive DNA probes on mitotic and meiotic chromosomes allowed the identification of all rye chromosomes. The pSc119.2 probe identified some wheat chromosomes, namely from B genome, and the chromosome pairs 4A and 5A.
    Źródło:
    Plant Breeding and Seed Science; 2005, 51; 11-20
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przeobrażenia przestrzeni publicznej w małych miastach Europy zachodniej
    Transformations and multiform of public urban spaces of small western european cities
    Autorzy:
    Wantuch-Matla, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/369349.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    hybrydyzacja
    małe miasta
    przeobrażenia przestrzeni publicznej
    hybridisation
    small cities
    towns
    transformations of the public space
    Opis:
    W powszechnym dyskursie dotyczącym przeobrażeń współczesnych miejskich przestrzeni publicznych prym wiodą rozważania nad zmianami będącymi udziałem dużych światowych metropolii. Wskazuje się na powstawanie regionów zurbanizowanych, skoncentrowanych wokół nich, oraz słabnącą, a z pewnością zmieniającą się rolę małych miast w coraz większym stopniu zależnych od ekspansywnych i silnych ośrodków miejskich. Jednak przestrzeń małych miast także podlega współcześnie istotnym przekształceniom i swoistej „hybrydyzacji”. Niniejszy artykuł omawia przykłady transformacji przestrzeni publicznych małych miast w wybranych krajach Europy Zachodniej, dające świadectwo i obraz wielowymiarowości wspomnianych przemian, stanowiących element szerszej i przemyślanej strategii rozwoju.
    The common discourse on today’s transformations of contemporary public urban spaces, are dominated by reflections of changes occurring within the biggest world cities. Majority of discussions focus on the process of urban regions development while small cities’ role weakens and changes, as they are more and more dependent on the expansionist, stronger and larger ones. Nonetheless, the public spaces of small cities undergo similar modifications and are susceptible to phenomena of “hybridization”, much the same as big urban centers. The paper discusses and presents select examples of public space transformations in small Western European cities, underpinning the image and proof of the multilayered nature of these unusual changes often being results of thoughtfully planned city development strategies.
    Źródło:
    Przestrzeń i Forma; 2015, 23/2; 179-190
    1895-3247
    2391-7725
    Pojawia się w:
    Przestrzeń i Forma
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Petrology and geochemistry of granitoids and their mafic micogranular enclaves (MME) in marginal part of the Małopolska Block (S Poland)
    Autorzy:
    Wolska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/127582.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    the Małopolska Block (MB)
    host granodiorites (HG)
    mafic microgranular enclaves (MME)
    Q-diorites
    tonalites
    mixing
    mingling
    hybridisation process
    Opis:
    Granitic plutons (the Dolina Będkowska valley and Pilica area) were found in a few boreholes in the Małopolska Block (MB). These granitic rocks may represent apical parts (apophyses) of a great magmatic bodies (batholiths) located in deeper level of the Ediacaran/Paleozoic basement. They are described as ‘stitching intrusions’, generated during/after collision in Carboniferous/Permian period (~300 Ma) between the Upper Silesian Block (USB) and the Małopolska Block (MB). These rocks are fresh, unaltered granodiorites that are pale grey in colour. They have holocrystalline, medium- to coarse-grained structure and massive texture. For the first time, several mafic microgranular enclaves (MME), varying in size and colour, were found in the granodioritic host (HG). The occurrence of MME in the host granodioritic rocks is evidence of a mingling process between mafic and felsic magmas. The MME are pale/dark grey in colour, fine-grained rocks with ‘porphyritic’ textures. They consist of large megacrysts/xenocrysts of plagioclase, quartz, alkali feldspars and the fine-grained groundmass of pseudo-doleritic textures (lath-shaped plagioclases, blade-shaped amphiboles/biotites). According to their modal/mineral composition, they represent Q-diorites and tonalites. The MME, similar to the host granodiorites (HG), are I-type rocks, exhibit high Na2O content >3.2 wt%; normative diopside or normative corundum occurs (mainly <1%). They are metaluminous to slightly peraluminous (ASI <1.1) and have calc-alkaline, medium-K to high-K character. They generally belong to magnesian series (#Mg=0.20-0.40) and have low agpaitic index (<0.87). They are low evolved magmatic rocks. The rocks studied are enriched in LREEs (La, Ce, Sm) compared to HREEs. The Eu* negative anomaly and high Sr contents point to varying degrees of plagioclase fractionation connected to the mixing process rather than simple fractional crystallization. Both rocks studied (HG and MME) are characterized by a high content of LILEs (K, Ba, Rb) in normalized patterns and a low HFS/LIL elements ratio (Ta, Nb)/(K, Rb, La). The projection points of the rocks studied plot in different fields of various petrochemical diagrams: mainly in the arc granites that are rare in the pre-collisional granites as well as the syn-subductional to post-collisional granites fields. For the first time, inner textures in rock-forming minerals related to mixing processes are described both in the granodioritic host (HG) and in the MME. Mantled boxy cellular plagioclase megacrysts with ‘old cores’ of labradorite composition, and amphibole aggregates with titanite and opaque minerals, represent peritectic rather than primary residual minerals. The plagioclase, quartz and alkali feldspar megacrysts/xenocrysts were mechanically transferred from the granodioritic host (HG) to MME. The presence of lath-shaped plagioclases, blade-shaped amphiboles/biotites and acicular-shaped apatites in the groundmass of the MME is evidence of undercooling of hot mafic blobs in a relatively cold granodioritic magma chamber. The MME were hybridized by leucocratic melt squeezed from the granodioritic magma in a later stage of the mixing process (quartz and alkali crystals in the interstices in the MME groundmass). In the granodiorites (HG), the spike and spongy cellular zones as well as biotite/amphibole zones in plagioclase megacrysts are connected to the mixing process. Both of the rocks studied are characterized by different amounts of major elements (SiO2, Na2O and K2O), trace elements (Ni, Cr, V, Ti and P), #Mg and modified alkali–lime index (MALI) that is related to their origins from different sources. On the other hand, they have similar chondrite-normalized patterns (for trace elements and REE), LILEs contents (Sr, Ba, Rb), aluminum saturation index (ASI) and isotopic signatures (high 86Sr/87Sr(0.079-0.713) and low 143Nd/144Nd (0.512) values but lower than in continental crust), which are evidence of the strong hybridisation of mafic enclaves by the granodioritic host magma. The parental rocks of both rocks studied have a similar mafic signature but were generated in different sources: the host granodiorites (HG) magma in lower continental crust rocks, and the MME magma in enriched upper mantle. The MME crystallized from strongly hybridized magma of intermediate compositions (Q-diorite, tonalite) rather than from primary mafic magma. The host granodiorites (HG) originated from completely homogenized crustal granodioritic magma which inherited its geochemical signature from ancient arc-rocks in a subduction-related setting.
    Źródło:
    Mineralogia; 2012, 43, 1/2; 3-127
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FISH mapping of 18S-5.8S-26S rRNA genes and fluorochrome banding in the triploid viviparous onion Allium x cornutum Clementi ex Visiani, 1842
    Autorzy:
    Lepen, I.
    Puizina, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/19898.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rRNA gene
    fluorochrome banding
    triploid
    Allium cepa var.viviparum
    fluorescence in situ hybridization
    FISH zob.fluorescence in situ hybridisation
    mapping
    onion
    Allium
    viviparous onion
    Allium cepa var.proliferum
    Opis:
    Triploid viviparous onions [Allium × cornutum Clementi ex Visiani 1842, syn Allium cepa L. var. viviparum Metzg. (ALEF.), auct.] (2n = 3x = 24), are known in some countries only as rare relict crops. In other parts of the world they are still traditionally or even commercially cultivated. In previous cytogenetic studies of the Croatian triploid viviparous onion Ljutika, Giemsa C-banding, chromosome pairing analysis during meiosis, and genomic hybridization in situ indicated a complex hybrid with highly heterozygous karyotype structure, with possible triparental genome organization. This study continues an analysis of the karyotype structure of Ljutika. Staining with fluorochromes CMA3 (Chromomycin A3) and DAPI (4,6-diamidino-2-phenylindole) confirmed previous results from Giemsa C-banding and revealed GC-rich heterochromatic regions associated mainly with chromosome ends and nucleolus organizing regions (NORs), and only a few interstitial bands. FISH mapping of the ribosomal 18S-5.8S-26S genes revealed two major rDNA signals on the short arms of two subtelocentric satellite chromosomes in almost all metaphase plates of Ljutika. The largest subtelocentric chromosome lacked rDNA signals. A significantly smaller rDNA signal was occasionally located on one small submetacentric chromosome. These results are in agreement with previously published results from identification of NORs by silverstaining technique, which confirmed a maximum three nucleoli in interphase nuclei. We discuss the molecular mechanisms underlying rearrangements and activity of ribosomal genes in the triploid karyotype.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2011, 53, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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