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    Wyświetlanie 1-20 z 20
    Tytuł:
    Metabolomic analysis of biological material using LC-MS in the quest for urinary system cancer biomarkers - review
    Autorzy:
    Szuberla, Wiktoria
    Wrona, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/31342652.pdf
    Data publikacji:
    2024
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    mass spectrometry
    metabolomics
    LC-MS
    kidney cancer
    renal cell carcinoma
    bladder cancer
    spektrometria mas
    metabolomika
    rak nerki
    rak nerkowokomórkowy
    rak pęcherza moczowego
    Opis:
    Renal cell carcinoma (RCC) and bladder cancer (BC) are among the most frequently diagnosed urinary system cancers worldwide. They are characterized by high mortality and recurrence rates. In response to the rising incidence and mortality rates, scientists are exploring innovative diagnostic and therapeutic methods. Metabolomics, which analyzes metabolite levels, may enable early diagnosis and monitoring of therapy progress. Compared to other omics technologies, it focuses on the outcomes of metabolite activity, providing a unique perspective on processes occurring in cancer cells. Metabolomic analyses utilize techniques such as mass spectrometry. These methods allow the identification of biomarkers and precise determination of the chemical composition of biological samples. However, the most commonly used method is liquid chromatography-mass spectrometry (LC-MS), which enables the most comprehensive screening of cancer metabolomes. Recent studies show significant progress in recognizing characteristic metabolites associated with urological cancers, although this area remains partially unexplored. Research on circulating metabolites, especially those present in easily accessible samples like blood or urine, demonstrates promising potential in clinical practice. Study results reveal differences in metabolic profiles between various stages of cancer development, which may have clinical significance. The future of this field involves an increasing number of clinical cohorts, standardization of sample preparation, and further improvements in instrument sensitivity and speed. LC-MS-based metabolomics has the potential to contribute to the improvement of diagnostics, therapy, and the quality of life of patients with some urological cancers. However, challenges, such as the lack of uniform methodologies and understanding of metabolite determinants, require further research and innovation.
    Źródło:
    Chemical Technology & Biotechnology; 2024, 4; 70-75
    2720-6793
    Pojawia się w:
    Chemical Technology & Biotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biopolymer composites based on lignin and microcrystalline chitosan
    Autorzy:
    Kopania, Ewa
    Wiśniewska-Wrona, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1034711.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    biopolymer composites
    black liquid
    lignin
    medical and hygienic products
    microcrystalline chitosan
    Opis:
    The article presents method of extracting lignin from hardwood and softwood after chemical treatment. Lignin fractions were extracted from black liquid (the by-product of pulp and paper industry), in a different reaction environment. Biopolymer composites were obtained by combining extracted lignin fraction and microcrystalline chitosan, which can be used as preparations for innovative biopolymer materials that are applicable in medical and hygienic products. The studies were performed in order to evaluate MCCh/Lignin composites to suitability to construction of dressing materials in the form of sponges. The MCCh/Lignin composites were tested for different properties: mechanical, sorption and absorption. The obtained lignin fractions and MCCh/Lignin composites were characterized by different structures and chemical purity as confirmed by FTIR spectra.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 122-134
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biopolymer composites based on galactoglucomannans (ggms) and micrystaline chitosan (mcch)
    Autorzy:
    Kopania, Ewa
    Wiśniewska-Wrona, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1034988.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    biopolymer composites
    enzymatic treatment
    galactoglucomannans
    microcrystalline chitosan
    spruce
    thermal treatment
    Opis:
    The article presents a method of extracting galactoglucomannas (GGMs) from softwood (spruce). GGMs were extracted using thermal and enzymatic treatment in an aqueous environment. The extracted GGMs, depending on the extraction method, were characterized by different composition of simple carbohydrates i.e. glucose, galactose and mannose, as well as by the average molecular weight. Evaluation of the composition of GGMs obtained was performed using GC/MS and SEC. Biopolymer composites were obtained by combining GGMs and microcrystalline chitosan (MCCh), which can be used as preparations for plant protection and growth stimulation. The studies were performed in order to evaluate biological activity of composites based on Petri dish test in which their ability to stimulate seed germination of selected plants was estimated. The effect of plant growth stimulation depended on GGMs composition of simple carbohydrates. GC/MS and SEC chromatographic tests and 13C NMR analysis enabled to establish the composition and structural changes of the obtained GGMs and biocomposites
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 110-121
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości fizykochemiczne i funkcjonalne biokompozytów polimerowych
    Physicochemical and functional properties of polymer biocomposites
    Autorzy:
    Wiśniewska-Wrona, Maria
    El Fray, Mirosława
    Powiązania:
    https://bibliotekanauki.pl/articles/947105.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    rany odleżynowe
    chitozan
    alginian
    opatrunek w postaci jednowarstwowej błony
    FT-IR
    DSC
    NMR
    bedsores
    chitosan
    alginate
    single layer film wound dressing
    Opis:
    Otrzymano błony biokompozytowe wytworzone na bazie chitozanu (Chit) i alginianu sodu (Alg) z udziałem substancji leczniczych o działaniu przeciwzapalnym (siarczan cynku) i przeciwbakteryjnym (sulfanilamid). Metodami spektrofotometrii w podczerwieni (FT-IR), magnetycznego rezonansu jądrowego (NMR) oraz różnicowej kalorymetrii skaningowej (DSC) oceniono wpływ zawartości chitozanu i alginianu na budowę chemiczną i temperaturę przemian fazowych biokompozytów. Analiza termiczna wykazała, że dodatek substancji leczniczych do materiałów biokompozytowych wpływa zarówno na obniżenie ich temperatury topnienia, jak i na zmniejszenie entalpii związanej z tą przemianą.
    Biocomposite films based on chitosan (Chit) and sodium alginate (Alg) and containing anti-inflammatory (zinc sulfate) and antimicrobial (sulfanilamide) pharmaceutical ingredients were prepared. The effects of variable chitosan and alginate contents on the chemical structure and phase transition temperatures of biocomposites were studied using infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) and differential scanning calorimetry (DSC). Thermal analysis showed that the addition of pharmaceuticals decreased the melting temperature and melting enthalpy of polymer biocomposites.
    Źródło:
    Polimery; 2019, 64, 1; 23-33
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional three-component polymeric biocomposites for the treatment of bedsores
    Autorzy:
    Wiśniewska-Wrona, Maria
    El Fray, Mirosława
    Powiązania:
    https://bibliotekanauki.pl/articles/1034423.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    Chitosan
    FTIR
    NMR
    alginate
    carboxymethyl cellulose
    dressing DSC
    Opis:
    Presented here are the results of investigations into the preparation of three-component dressing materials from various biopolymers in the form of a single-layer film which is suitable as a carrier for pain-relieving (lidocaine) and bacteriostatic (sulphanilamid) therapeutic agents. Physical-chemical, biological and usable properties of the prepared materials were tested and assessed. The amount of added active substance was adopted based on the dose recommended by the Polish Pharmacopeia for external medicinal preparations. Antibacterial activity against gram (-) Escherichia coli and gram (+) Staphylococcus aureus was assessed in some of the biocomposites by quantitative methods. The cytotoxic action in direct contact with the mouse fibroblast NCTC clone 929 was also estimated. Thermal analysis (DSC), infrared spectrophotometry (FTIR) and nuclear magnetic resonance spectroscopy were employed to investigate the impact of the variable contents of chitosan, alginate, carboxymethyl cellulose (CMC), and the active substance upon the chemical- and phase-structure of the prepared three-component polymeric biocomposites. It was found that the quantitative composition of the biocomposites and the additive of active substances lidocaine and sulphanilamide exert a vital impact upon their physical-mechanical and usable properties (imbibition, absorption). Investigations into the release of the medicinal substance from the investigated biocomposites to an acceptor fluid led to the conclusion that the kinetics of the process may be described by a complex first order rate equation with two exponential functions.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 185-206
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of oligochitosans in regulation of cellular activity and location of pyruvate kinase (pk) isoenzyme m2 that affects proliferation of ehrlich ascites tumor cells (eat)
    Autorzy:
    Ignacak, Jan
    Wiśniewska-Wrona, Maria
    Pałka, Iwona
    Niekraszewicz, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1035231.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    isoenzyme M1 and M2 pyruvate kinase
    nucleus
    oligochitosans
    ε-methyl-L-lysyne
    Opis:
    The pyruvate kinase isoenzyme M2 originating from the nucleoplasm and cytoplasm of tumor cells, with its highest affinity to the 2-phosphoenolpyruvate (2-PEP) and sensitivity to L-cysteine, contributes to an increased generation of energy as ATP, necessary for tumor cell proliferation. In the presence of L-cysteine, the isoenzyme M2 PK demonstrates the activity of histone kinase, transferring the phosphoryl group from 2-PEP to the ε-amine residue of the H1 histone lysine. Oligochitosans induce expression of the inducible nitric oxide synthase gene (iNOS), what results in an increased synthesis of nitric oxide, which reacts with L-cysteine and produces L-S-nitrosocysteine. Lack of L-cysteine contributes to inhibition of kinase activity of the H1 histone, an M2 PK isoenzyme. Decreased phosphorylation of the H1 histone contributes to inhibition of EAT cell proliferation. No effect on proliferation of normal cells that include the PK M1 isoenzyme has been observed in the presence of oligochitosans.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 67-76
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie polimerów naturalnych do uszlachetniania materiału siewnego
    The use of natural polymers for treatments enhancing sowing material
    Autorzy:
    Korbecka-Glinka, Grażyna K.
    Wiśniewska-Wrona, Maria
    Kopania, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/1789915.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    zaprawianie nasion
    otoczkowanie nasion
    biopolimery
    patogeny
    biodegradacja
    bioaktywność
    seed dressing
    seed coating
    biopolymers
    pathogens
    biodegradation
    bioactivity
    Opis:
    Biopolimery z grupy polisacharydów, dzięki swoim właściwościom fizykochemicznym, podatności na modyfikację chemiczną i biodegradację oraz wysoką bioaktywność, są wykorzystywane do uszlachetniania materiału siewnego roślin uprawnych. Polimery naturalne, takie jak: chitozan, alginian, celuloza, galaktoglukomannany, lignina oraz guma gellanowa mogą być stosowane jako substancje wiążące w otoczkowaniu nasion lub jako nośnik substancji aktywnych i mikroorganizmów. Biopolimery zawarte w otoczkach lub zaprawach nasiennych mogą ponadto przyczyniać się do ograniczenia niekorzystnego wpływu środowiska i patogenów na kiełkujące nasiona.
    Biopolymers from a group of polysaccharides are used in treatments enhancing sowing material of crops due to their physical and chemical properties, susceptibility to chemical modification, biodegradability and high bioactivity. Natural polymers, such as: chitosan, alginian, celulose, galaktoglucomannans, lignin and gellan gum, can be used as binders in seed coating or carriers of active substances and microorganisms. Moreover, biopolymers contained in the seed coatings and seed dressings can protect germinating seeds from unfavorable influence of environment and pathogens.
    Źródło:
    Polimery; 2021, 66, 1; 11--20
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of oligochitosans in regulation of cellular activity and location of pyruvate kinase (pk) isoenzyme m2 that affects proliferation of ehrlich ascites tumor cells (eat)
    Autorzy:
    Ignacak, Jan
    Wiśniewska-Wrona, Maria
    Pałka, Iwona
    Niekraszewicz, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1035209.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    isoenzyme M1 and M2 pyruvate kinase
    nucleus
    oligochitosans
    ε-methyl-L-lysyne
    Opis:
    The pyruvate kinase isoenzyme M2 originating from the nucleoplasm and cytoplasm of tumor cells, with its highest affinity to the 2-phosphoenolpyruvate (2-PEP) and sensitivity to L-cysteine, contributes to an increased generation of energy as ATP, necessary for tumor cell proliferation. In the presence of L-cysteine, the isoenzyme M2 PK demonstrates the activity of histone kinase, transferring the phosphoryl group from 2-PEP to the ε-amine residue of the H1 histone lysine. Oligochitosans induce expression of the inducible nitric oxide synthase gene (iNOS), what results in an increased synthesis of nitric oxide, which reacts with L-cysteine and produces L-S-nitrosocysteine. Lack of L-cysteine contributes to inhibition of kinase activity of the H1 histone, an M2 PK isoenzyme. Decreased phosphorylation of the H1 histone contributes to inhibition of EAT cell proliferation. No effect on proliferation of normal cells that include the PK M1 isoenzyme has been observed in the presence of oligochitosans.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 67-76
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    POTENTIAL USE OF CHITOSAN – BASED MATERIALE IN MEDICINE
    Autorzy:
    Kucharska, Magdalena
    Ciechańska, Danuta
    Niekraszewicz, Antoni
    Wiśniewska-Wrona, Maria
    Kardas, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/1035560.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    biomaterials
    medicine
    polysaccharides
    Opis:
    Polysaccharides are macromolecular polymers that manifest ability toward the forming of fibres, film and coatings. Some of their specific properties like biodegradability and biocompatibility make them suitable for medical application. Chitin, chitosan and alginates are basic polymers mostly used in the preparation of medical biomaterials. In the Institute of Biopolymers and Chemical Fibres (IBWCh) multidirectional investigations are in full swing concerned with the use medical of polysaccharides and their various useful forms. The research includes amongst: multifunctional dressing materials, implants and other polysaccharide biomaterials.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 169-176
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polymer biocomposites used in bedsores treatment
    Autorzy:
    Wiśniewska-Wrona, Maria
    Kucharska, Magdalena
    Kardas, Iwona
    Bodek, Andrzej
    Bodek, Henryka
    Powiązania:
    https://bibliotekanauki.pl/articles/1035413.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    bacteriostatic agent
    bedsore
    dressing
    film
    polymeric biocomposites
    Opis:
    Investigations are presented in the preparation of composite dressing material based on two biopolymers -chitosan and sodium alginate with the addition of sulfanilamide as medication designed for the healing of bedsores. The dressing was prepared in the form of film. The biopolymers used in the construction of the film make the dressing biodegradable and resorbable in the wound’s environment. Mechanical properties of the film were tested: thickness, extension strength, tenacity and elongation at maximum stress The ability of the material to match the wound was examined, too, as well as the transmission of water vapor. Sulfanilamide as bacteriostatic agent was added to the prepared composites. Mechanical and sorption properties of the composite dressings with addition of the active substance depend largely on their composition. The sorption properties were tested before and after addition of the medication .The release of the medication is intricate and proceeds according to kinetics of first order. Susceptibility of the composite materials to hydrolytic and enzymatic degradation was assessed.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2011, 16; 111-120
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of chitosan oligomers in regulation of ehrlich ascites tumor cells proliferation in vitro
    Autorzy:
    Ignacak, Jan
    Wiśniewska-Wrona, Maria
    Pałka, Iwona
    Zagajewski, Jacek
    Niekraszewicz, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1035427.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    EAT cells proliferation
    L-S-nitrosocysteine.
    chitosan oligomers
    pyruvate kinase M2 isoenzyme
    Opis:
    Preliminary studies of proliferation of Ehrlich ascites tumor (EAT) cells and normal mammary gland epithelial cells have demonstrated the process to be inhibited by degradation products of microcrystalline chitosan, i.e. oligomers. Inhibition of proliferation has been also accompanied by a decreased activity of the M2 pyruvate kinase (PK) isoenzyme in nucleoplasm, what may indicate the role of this enzyme in regulation of tumor cell proliferation. Determinations of nitrogen oxide in tumor and normal cells point to a higher level of this endogenous effector in normal cells. An increase of nitrogen oxide levels in Ehrlich ascites tumor cells effected by chitosan oligomers may indicate increased nitrosylation, and particularly an increased amount of compounds containing sulfhydryl groups and their participation in regulation of nucleoplasm M2 PK isoenzyme activity. Chitosan oligomers have smaller molecules as compared to microcrystalline chitosan and for this reason appear to be more effective than the latter in acting upon the negatively charged cell membrane surfaces, thus contributing to proliferation inhibition.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2011, 16; 89-98
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of chitosan on the synthesis of l-s-nitrosocysteine that participates in the regulation of the m2 pyruvate kinase isoenzyme activity associated with ehrlich ascites cells proliferation in vitro
    Autorzy:
    Ignacak, Jan
    Zagajewski, Jacek
    Pałka, Iwona
    Wiśniewska-Wrona, Maria
    Niekraszewicz, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1035527.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    L-S-nitrosocysteine
    L-cysteine
    inhibition of EAT cell proliferation
    microcrystalline chitosan
    pyruvate kinase M2 isoenzyme
    Opis:
    L-S-nitrosocysteine formation in EAT tumor cells and normal CRL-1636 cells incubated with microcrystalline chitosan was confirmed by RP-HPLC. The metabolite was identified based on UV-VIS spectra. The formation of L-S-nitrosocysteine in EAT tumor cells contributes to decreasing the level of L-cysteine in these cells. L-cysteine as an effector of the bifunctional M2 isoenzyme of pyruvate kinase (PK) initiates its histone kinase activity, which is responsible for histone H1 phosphorylation. A decrease of L-cysteine level in EAT tumor cells contributes to lack of histone H1 phosphorylation by the M2 PK isoenzyme and by the same token to inhibition of EAT cell proliferation.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 149-158
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of oligochitosans in akt kinase regulation
    Autorzy:
    Ignacak, Jan
    Wiśniewska-Wrona, Maria
    Dulińska-Litewka, Joanna
    Pałka, Iwona
    Kucharska, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/1034912.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    Akt kinase – PKB
    EAT cells proliferation
    HIF-1 factor.
    M2 pyruvate kinase
    Opis:
    Among characteristic properties of cancers, there is their increased glycolytic activity.Contrary to normal cells, neoplastic cells use anaerobic glycolysis, even when a sufficient amount of oxygen is available. The intensity of the process is associated with a considerable demand for energy in the form of ATP. Akt, which - acting through the mTOR pathway - activates the HIF-1 factor, which in turn activates hexokinase that participates in glucose phosphorylation, stimulates the transport of glucose to cells via increasing glucose transporters (GLUT) and activates lactate dehydrogenase (which transforms pyruvate to lactate). Chitosan, as well as products of its degradation - oligochitosans - contribute to inhibiting the activity of the Akt kinase, and thus contribute to inhibiting excessive glycolytic activity of Ehrlich ascites tumor (EAT) cells and to decreasing proliferation of these cells.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 73-81
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inhibition of ehrlich ascites tumour (eat) cells proliferation through chitosan-mediated regulation of activity of the akt pathway
    Autorzy:
    Ignacak, Jan
    Wiśniewska-Wrona, Maria
    Dulińska-Litewka, Joanna
    Pałka, Iwona
    Kucharska, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/1035195.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    Akt kinase - PKB
    EAT cells proliferation
    M2 pyruvate kinase
    chitosan
    Opis:
    Isoenzyme M2 pyruvate kinase, which is a marker of cancer transformation, can take both tetramer (cytosol) and dimer (nucleus) forms. The former is responsible for ATP synthesis, and the latter demonstrates histone H1 kinase activity. Regulation of the expression of pyruvate kinase through which Akt controls the expression of genes involved in Ehrlich ascites tumour (EAT) cell proliferation, migration and death, also involves cross-talk with the other signalling pathways, transcription factors and co-regulatory proteins such as β-catenin and c-Myc. Treatment of EAT cells with chitosans significantly reduced their proliferation (by 45-60%), expression of nuclear β-catenin, c-Myc as well as cell migration. After 48–72 hours of treatment of the cell with oligochitosans, lower levels of p-Akt were detected. Simultaneously, decreased expression of isoenzyme M2 PK protein levels was observed. The dimeric form (nucleus) can participate in H1 histone phosphorylation, which contributes to increased EAT cell proliferation.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 33-40
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biopolymer compositions for ecological protection and growth stimulation of plants
    Autorzy:
    Niekraszewicz, Antoni
    Wiśniewska-Wrona, Maria
    Kopania, Ewa
    Orlikowski, Leszek
    Pospieszny, Henryk
    Krawczyk, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1035390.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    biopolymer compositions
    growth stimulation.
    plant protection
    polysaccharides
    Opis:
    Presented herein are investigations in the preparation of an advanced , human-and environmentfriendly plant protection composition based on selected bioactive biopolymers of the polysaccharide family. In the Institute of Biopolymers and Chemical Fibres the biopolymers were prepared and the biological activity of chitosan in the form of salt and gel and of hemicelluloses (galactoglucomannans) and of their compositions was tentatively evaluated by way of plate tests. Estimated was the impact of such preparations upon the stimulation of the germination rate of radish seeds at concentration of 0.1, 0.01 and 0.005% after 72 hours. The efficacy of the preparations was evaluated based on the number of germinated seeds in the green mass of the sprouts and their length in comparison to a reference in water at pH = 7.0. In Research Institute of Horticulture, Skierniewice, Poland the usefulness of selected iopolymer preparations was evaluated as agents to protect decorative plants against some pathogens (on leaves, in soil) such as Phytophtora cryptogea causing decay of shoots and roots. It could be found that the biopolymer compositions applied to the soil provided a much better rooting of chrysanthemum cuttings in a Phytophtora cryptogea - infected soil. The cuttings were growing much faster and the number of infected ones was largely reduced. The usefulness of a number of chitosan formulations was also evaluated for seed pickling. It was found that the formulations exerted a distinctly positive impact upon the germination, growth and health of the seedlings. Laboratory and greenhouse testing was made in the Institute of Plant Protection, Poznań, Poland where the biological activity of some biopolymer compositions was evaluated. A first selection of the biopolymers was done based on an in vitro examination of the impact upon bacteria growth. (Gram negative - Erwinia amylovora and Gram positive Clavibacter ichiganensis ) on agar or agarose plates and upon the generation of necrotic stains on beans and tobacco caused by lucerne mosaic virus and tobacco mosaic virus respectively. It was found that the preparations with original biopolymer concentration had not affected the viruses directly but stimulated the plants’ immunity against the pathogens.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 149-162
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of chitosan in akt kinase regulation activity
    Autorzy:
    Ignacak, Jan
    Wiśniewska-Wrona, Maria
    Dulińska-Litewka, Joanna
    Pałka, Iwona
    Kucharska, Magdalena
    Kazimierski, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/1034695.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    Akt kinase (PKB)
    M2 pyruvate kinase
    cells migration
    metalloproteinases
    Opis:
    A decrease in migration of tumor cells incubated with the investigated chitosan preparations was correlated with a decreased activity of MMP-2 and MMP-9 metalloproteinases, what significantly affected inhibition of tumor cell proliferation. In the investigations of the effects of various chitosan preparations on expression of PCNA, Akt and β-catenin in the normal human 184A1 cells and in breast carcinoma MCF7 cells evaluated at the protein level, significant differences in inhibition of expression of selected genes were noted in the tumor cells. Similarly as in the case of human cells, in mouse cells, the differences in expression of the investigated genes involved solely the Ehrlich carcinoma cells. In the presence of the investigated chitosan preparations, there was observed inhibition of expression of the N-cadherin, β-catenin, Akt and PCNA genes. In case of p21 protein, its level increased, similarly as in the human breast carcinoma cells, what may also be related to phosphorylation of the protein, its capture by the cytosol and prolonging its half-life as compared to the non-phosphorylated form. In case of the normal human 181A1 cells and mouse CRL 1636 cells, no significant alterations were noted in expression of the investigated genes in presence of the employed chitosan preparations.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 73-82
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of oligochitosans on expression of inos gene in ehrlich ascites tumour in vitro
    Autorzy:
    Ignacak, Jan
    Wiśniewska-Wrona, Maria
    Dulińska-Litewka, Joanna
    Pałka, Iwona
    Zagajewski, Jacek
    Niekraszewicz, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1035407.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    chitosan oligomers
    histone H1
    iNOS (inducible nitric oxide synthase)
    nitric oxide
    Opis:
    Oligochitosans obtained through degradation of macromolecules of chitosan with a high degree of deacetylation turned out to be biologically active, contributing to an increase of nitric oxide levels in Ehrlich ascites tumor (EAT) cells through inducing expression of the isoform of inducible nitric oxide synthase (iNOS) gene. An increase of NO levels in EAT cells in the presence of the investigated oligochitosans might contribute to nitrosylation of L-cysteine – an allosteric effector of the M2 isoenzyme of pyruvate kinase (PK), which switches the PK kinase activity, responsible for ATP synthesis, to the histone kinase activity that may participate in histone H1 phosphorylation. Lack of the histone activity of the PK M2 isoenzyme may contribute to decreased histone H1 phosphorylation and thus inhibit EAT cells proliferation.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 141-148
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced cellulosic materials
    Autorzy:
    Brzoza-Malczewska, Kinga
    Kucharska, Magdalena
    Wiśniewska-Wrona, Maria
    Guzińska, Krystyna
    Jóźwicka, Jolanta
    Bacciarelli-Ulacha, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1034809.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    cellulosicproducts
    chitosan
    complex chitosan/alginate
    nanoparticles
    Opis:
    Aim of the work was to prepare a method of producing chitosan and chitosan-alginate nanoparticles designed for the modification of textile cellulosic products in hygiene and medical application. Spectrophotometry was used in the estimation of the prepared nanoparticles; analyzed, too, was the particle size and antibacterial and antifungal activity.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 7-17
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Haemostatic, resorbable dressing of natural polymers - hemoguard
    Autorzy:
    Kucharska, Magdalena
    Wiśniewska-Wrona, Maria
    Brzoza-Malczewska, Kinga
    Struszczyk, Marcin H
    Cichecka, Magdalena
    Wilbik-Hałgas, Bożena
    Rybak, Zbigniew
    Szymonowicz, Maria
    Paluch, Danuta
    Guzińska, Krystyna
    Kaźmierczak, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/1035068.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    biological and useful properties
    haemostatic
    natural polymers
    Opis:
    Investigations are presented in the preparation of a first aid haemostatic dressing that would exhibit an adequate haemostatic capacity in injuries and surgical wounds, an antibacterial activity to prevent primary and secondary infections, and offer safety in use
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 130-141
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chitosan applied for gypsum modification
    Autorzy:
    Mucha, Maria
    Mróz, Patrycja
    Wrona, Dominika
    Powiązania:
    https://bibliotekanauki.pl/articles/1034560.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    chitosan/PVA
    gypsum
    mechanical properties
    morphology
    setting time
    Opis:
    In order to improve the properties of gypsum materials, including workability, mechanical strength and ability to retain water, various admixtures (also polymers), known as plasticisers, have been applied. These polymers can be soluble in water, such as cellulose and starch ethers, or unsoluble applied in a form of dispersion up to 5% of weight fraction. The admixtures are added into initial water and mixed with hemihydrate calcium sulphate in a proper ratio. In the hydration process of the hemihydrate into dehydrate, a crystallisation process leading to gypsum setting occurs. In the present work, a chitosan sample of DD=85% in two forms was applied: dissolved in 1% acetic acid and as a water dispersion in the weight fraction up to 1% of the gypsum matrix. The water to gypsum ratios of 0.6 or 0.74 was applied. The influence of chitosan on the rate of setting and kinetics of crystallisation of gypsum was investigated and discussed. The morphological structure of the resulting gypsum sample was examined using SEM microscopy. In the presented results, chitosan in the form of a 1% dispersion was a setting retardant and it changed the morphological structure of gypsum. However, mechanical tests showed a decrease of bending strength. When chitosan was applied as a biomaterial, the chitosan content in the composite was equal to 10%, and thus a compressing strength increased. The presence of PVA (polyvinyl alcohol) in the gypsum matrix caused a small effect on gypsum setting in contrast to PVAc (polyvinyl acetate), which is a good admixture for both cement and gypsum [2,3].
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 166-175
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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