Testing of microstructural and analysis of the structure of supermolecular yarn filter based on synthetic fiber-forming polymers

W artykule dokonano analizy mikrostruktury oraz wyznaczono procentową zawartość struktury krystalicznej (Sk) dla przędzy wykonanej z mieszaniny PP/PE mającej zastosowanie do produkcji tkanin filtracyjnych. Badania przeprowadzono przy użyciu elektronowej mikroskopii scanningowej oraz dyfraktometrii rentgenowskiej XRD. Opisano technologię wytwarzania materiału badawczego - przędzenia ze stopionej masy polimeru.This article analyzes the microstructure and determination of the percentage of crystalline structure (Sk) for a yarn made of a mixture of PP/PE applicable to the production of filter fabrics. Studies were conducted using electron microscopy and X-ray diffractometry scanningowej XRD. Described manufacturing technology research material - spinning the molten polymer

Testing selected antielectrostatic properties of screen fabrics used in the mining industry

W artykule omówiono właściwości wybranych tkanin oraz proces ich produkcji. Przedstawiono przykład weryfikacji wybranych właściwości antyelektrostatycznych tkanin stosowanych do budowy tam podsadzkowych. Zbadano zmianę zdolności odprowadzania ładunku elektrostatycznego w czasie. Pomiary miały na celu weryfikację podawanych przez producenta parametrów tkanin dostępnych w handlu.Testing selected antielectrostatic properties of screen fabrics used in the mining industry The article discusses anielectrostatic properties of fabrics used for screens. The change in the ability to carry away electrostatic charge with time was tested. The production process was also presented and properties of selected fabrics were described. The measurements were designed to verify the parameters given by the manufacturer of commercially available fabrics

Analysis of the impact of aging ultraviolet radiation structure and qualities multicolored ribbons of polypropylene

W artykule przybliżono rodzaje polimerów, które stosowane są do wytwarzania tasiemek oraz środki pomocnicze - barwniki i stabilizatory. Zaprezentowano ponadto wytłaczarkę, przy pomocy której produkowane są tasiemki. Zwięźle opisano wyroby, które powstają z tasiemek polipropylenowych, jak również ogólne ich zastosowanie. W części badawczej przybliżono parametry procesu technologicznego. Próbki tasiemek na bazie polimerów syntetycznych poddano badaniu starzenia promieniowaniem UV, po czym zbadano ich strukturę i właściwość jakościową - barwę.The article brought closer types of polymers, which are used to produce ribbons and additives - pigments and stabilizers. They presented further extruder with which tapes are produced. Briefly describe the products that are produced from polypropylene tapes, as well as their general use. In the research part approximated parameters of the process. Comp tapes based on synthetic polymers were subjected to UV aging, and examined its structure and property of quality - color

The impact of turning on thermal shrinkage of polypropylene textile silk used in the production on filter fabri

W artykule dokonano oceny wpływu rodzaju skrętu przędzy na jej skurcz termiczny. Przebadano nawoje jedwabiu polipropylenowego o grubości 500 den w czterech postaciach: bez skrętu i o skręcie Z-40, Z-80 i Z-120. Udowodniono, że im skręt przędzy większy tym mniejszy jest jej liniowy skurcz termiczny, co korzystnie wpływa na jakość produkowanych z niej tkanin filtracyjnych.The article was assessed the impact of the type of yarn turning its on the thermal shrinkage. Polypropylene silk coils tested a thickness of 500 den in four forms: without turning and turning Z-40, Z-80 and Z-120. It has been proved that the higher twist yarn, the smaller is the linear thermal contraction, which reduces the quality of products produced from the filter fabrics

Lowered H3K27me3 and DNA hypomethylation define poorly prognostic pediatric posterior fossa ependymomas.

Childhood posterior fossa (PF) ependymomas cause substantial morbidity and mortality. These tumors lack recurrent genetic mutations, but a subset of these ependymomas exhibits CpG island (CpGi) hypermethylation [PF group A (PFA)], implicating epigenetic alterations in their pathogenesis. Further, histological grade does not reliably predict prognosis, highlighting the importance of developing more robust prognostic markers. We discovered global H3K27me3 reduction in a subset of these tumors (PF-ve ependymomas) analogous to H3K27M mutant gliomas. PF-ve tumors exhibited many clinical and biological similarities with PFA ependymomas. Genomic H3K27me3 distribution showed an inverse relationship with CpGi methylation, suggesting that CpGi hypermethylation drives low H3K27me3 in PF-ve ependymomas. Despite CpGi hypermethylation and global H3K27me3 reduction, these tumors showed DNA hypomethylation in the rest of the genome and exhibited increased H3K27me3 genomic enrichment at limited genomic loci similar to H3K27M mutant gliomas. Combined integrative analysis of PF-ve ependymomas with H3K27M gliomas uncovered common epigenetic deregulation of select factors that control radial glial biology, and PF radial glia in early human development exhibited reduced H3K27me3. Finally, H3K27me3 immunostaining served as a biomarker of poor prognosis and delineated radiologically invasive tumors, suggesting that reduced H3K27me3 may be a prognostic indicator in PF ependymomas

Lowered H3K27me3 and DNA hypomethylation define poorly prognostic pediatric posterior fossa ependymomas.

Childhood posterior fossa (PF) ependymomas cause substantial morbidity and mortality. These tumors lack recurrent genetic mutations, but a subset of these ependymomas exhibits CpG island (CpGi) hypermethylation [PF group A (PFA)], implicating epigenetic alterations in their pathogenesis. Further, histological grade does not reliably predict prognosis, highlighting the importance of developing more robust prognostic markers. We discovered global H3K27me3 reduction in a subset of these tumors (PF-ve ependymomas) analogous to H3K27M mutant gliomas. PF-ve tumors exhibited many clinical and biological similarities with PFA ependymomas. Genomic H3K27me3 distribution showed an inverse relationship with CpGi methylation, suggesting that CpGi hypermethylation drives low H3K27me3 in PF-ve ependymomas. Despite CpGi hypermethylation and global H3K27me3 reduction, these tumors showed DNA hypomethylation in the rest of the genome and exhibited increased H3K27me3 genomic enrichment at limited genomic loci similar to H3K27M mutant gliomas. Combined integrative analysis of PF-ve ependymomas with H3K27M gliomas uncovered common epigenetic deregulation of select factors that control radial glial biology, and PF radial glia in early human development exhibited reduced H3K27me3. Finally, H3K27me3 immunostaining served as a biomarker of poor prognosis and delineated radiologically invasive tumors, suggesting that reduced H3K27me3 may be a prognostic indicator in PF ependymomas