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Wyniki wyszukiwania dla: ENTREPRENEURIAL ACTIVITY
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Physical activity of tourism and recreation students in terms of accressibility to open areas
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Antioxidant and antimicrobial activity of fermented beverages obtained from fruit pomace
PublikacjaFruit pomace should not be considered as a waste product but as a by-product as it contains a lot of valuable components such as dietary fiber, bioactive compounds and a source of nutrients. The reasonable way to utilize these by-products, both fresh or dried, could be the fermentation of its extracts, leading to beverages with functional properties. In our research, we checked the possibility of using chokeberry, apple and...
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Combretastatin A-4 (CA-4) and its analogues. Synthesis and biological activity
PublikacjaSpośród wielu związków przeciwnowotworowych otrzymanych w ostatnich dwóch dekadach, na szczególną uwagę zasługują te, które powodują reorganizację mikrotubul. Jedną z takich substancji jest opisana w artykule kombretastatyna A-4 (CA-4), związek który indukuje apoptozęproliferujących komórek śródbłonka naczyń guza nowotworowego. Hamuje on polimeryzację tubuliny, prowadząc do rozpadu mikrotubul. CA-4 wyizolowana została z kory wierzby...
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The effect of cabbage juices on the activity and expression of GST isozymes in HepG2 cells
PublikacjaWcześniejsze badania pokazały zdolność soków z kapusty białej do indukowania aktywności enzymów detoksykacyjnych. Prezentowane wyniki potwierdziły zdolność fitokompleksu kapusty do stymulacji aktywności enzymów z grupy GST w komórkach HepG2 - modelu ludzkiej wątroby - w szczególności izoenzymów GST-alfa i GST-mi.
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Antibacterial activity of the secondary metabolites from in vitro cultures of Drosera aliciae
PublikacjaRośliny owadożerne (D. aliciae) metabolity wtórne farmakologicznie czynne substancje. Na wzrost akumulacji tychże substancji w tkankach roślin owadożernych ma wpływ dodatek elicytora. Końcowego oznaczenia zawartości metabolitów w ekstraktach roślinnych dokonano techniką chromatografii cieczowej.
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Systematic review examining the evidence for impact of school policies on physical activity
PublikacjaBackground Epidemiological evidence has demonstrated that physical activity can have substantive health benefits for children and young people. The 'Policy Evaluation Network' is a multi-disciplinary research network across 7 European countries and New Zealand aimed at building capacity and evaluating the level of impact of policy interventions for promoting healthy lifestyles. The Toronto Charter identified 'whole-of-school' programmes...
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Hydrazinolysis Products of Selected Sugar Lactones—Crystal Structure and Microbiological Activity
PublikacjaCommercially available lactones, as well as those synthesized by us, turned out to be good substrates for the synthesis of sugar hydrazides. The exception was L-ascorbic acid, whose hydrazinolysis led to the formation of a hydrazinium salt, not the hydrazide as expected. The structure of all compounds was confirmed by NMR and X-ray analyses. The lower durability of hydrazinium L-ascorbate was additionally confirmed by thermogravimetric...
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Comparison of Acoustic and Visual Voice Activity Detection for Noisy Speech Recognition
PublikacjaThe problem of accurate differentiating between the speaker utterance and the noise parts in a speech signal is considered. The influence of utilizing a voice activity detection in speech signals on the accuracy of the automatic speech recognition (ASR) system is presented. The examined methods of voice activity detection are based on acoustic and visual modalities. The problem of detecting the voice activity in clean and noisy...
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Preparation, characterization and photocatalytic activity of TiO2 microspheres decorated by bimetallic nanoparticles
PublikacjaComposite photocatalysts that consist of TiO2and noble metal nanostructures have been considered tobe the promising and pivotal material for accessible enhancement of the efficiency in the photocatalyticprocess carried out in the aqueous and gas phases. In this work we fabricated porous TiO2microspheresthrough a hydrothermal process followed by photochemical reduction of noble metal nanoparticles atthe TiO2surface. The morphology...
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Investigations on the immunosuppressive activity of derivatives of mycophenolic acid in immature dendritic cell
PublikacjaThe main activity of mycophenolic acid (MPA) and its analogs is the inhibition of proliferation of T cells. Here, we hypothesized that MPA and its conjugates inhibits also the activity of antigen-presenting cells (APC) including dendritic cells (DCs). We tested the effect of novel amino acid derivatives of MPA and conjugates of MPA with acridines/acridones on DCs by flow cytometry, ELISA and MLR assay. Both acridines/acridone derivatives...
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Dual-wavelength polarimeter application in investigations of the optical activity of a langasite crystal
PublikacjaA method of high accuracy polarimetry, which includes optical activity measurements systematic errors, was realized with dual-wavelength polarimeter for two wavelengths of 635 and 650 nm. Simultaneous measurements with neighboring wavelengths significantly improved the data processing, by increasing the amount of data to eliminate the systematic errors. For langasite crystal La3Ga5SiO14 we measured temperature dependence of the...
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Activating Public Space: How to Promote Physical Activity in Urban Environment
PublikacjaPhysical activity is an essential component of a healthy lifestyle. The quality and equipment of urban public space plays an important role in promoting physical activity among people (residents, tourists). In order for recreation and sports activities to be undertaken willingly, in a safe and comprehensive manner, certain spatial conditions and requirements must be met. The distinctive feature of contemporary large cities is the...
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Synthesis and antimicrobial activity of amino acid and peptide derivatives of mycophenolic acid
PublikacjaThe series of 16 novel amino acid and peptide mycophenolic acid (MPA) derivatives was obtained as potential antibacterial agents. Coupling of MPA with respective amines was optimized with condensing reagents such as EDCI/DMAP and T3P/TEA. Amino acid analogs were received both as methyl esters and also with the free carboxylic group. The biological activity of the products was tested on five references bacterial strains: Klebsiella...
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Electrochemical Activity of Electrode Material Consisting of Porous Copper and Silica Aerogel
PublikacjaElectrochemically obtained copper was combined with silica aerogel (SiO2ag). Obtained composite (SiO2@Cu/CuxOy) was tested as an electrode in contact with LiPF6 in EC/DMC electrolyte. The electrochemical measurements showed the presence of complex redox couple activities of SiO2@Cu/CuxOy. This experiment was employed to help in understanding the carbon role used as an electric contact for silica in Li-Ion batteries and clarify...
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Comparison of antimicrobial activity of selected, commercially available wound dressing materials
PublikacjaOBJECTIVE: The aim of our study was to examine the antimicrobial potential of eight selected, commercially available wound dressings containing different antimicrobial agents: silver, chlorhexidine acetate, povidone-iodine, and manuka honey. METHOD: The materials were tested against four reference strains of bacteria: Staphylococcus aureus (PCM 2051), Staphylococcus epidermidis (PCM 2118), Pseudomonas aeruginosa (ATCC 27853),...
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Electrical Stimulation Modulates High Gamma Activity and Human Memory Performance
PublikacjaDirect electrical stimulation of the brain has emerged as a powerful treatment for multiple neurological diseases, and as a potential technique to enhance human cognition. Despite its application in a range of brain disorders, it remains unclear how stimulation of discrete brain areas affects memory performance and the underlying electrophysiological activities. Here, we investigated the effect of direct electrical stimulation...
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Investigations of the optical activity of nonlinear crystals by means of dual-wavelength polarimeter
PublikacjaA dual-wavelength method in high accuracy polarimetry has been successfully tested and applied to measure optical activity (OA) of nonlinear crystals. In proposed polarimetric scheme two neighboring semiconductor laser wavelengths (635 and 650 nm) are used, which increases number of parameters measured simultaneously and improves the data processing. By neglecting dispersion of eigen wave ellipticity in crystals, more efficient...
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THE INFLUENCE OF INTERPERSONAL MOTIVATION ON POLISH CONSUMERS’ ONLINE BRAND-RELATED ACTIVITY
PublikacjaThe development of social media has a substantial impact on the surge of social engagement of Internet users. It is particularly prominent in the domain of content creation and content sharing. Such communication may contain various references to different products brands and companies. Internet users may refer to them explicitly or brands may be present in the background only. Therefore, it is pivotal for managers and researchers...
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Titania Nanofiber Scaffolds with Enhanced Biointegration Activity—Preliminary In Vitro Studies
PublikacjaThe increasing need for novel bone replacement materials has been driving numerous studies on modifying their surface to stimulate osteogenic cells expansion and to accelerate bone tissue regeneration. The goal of the presented study was to optimize the production of titania-based bioactive materials with high porosity and defined nanostructure, which supports the cell viability and growth. We have chosen to our experiments TiO2...
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Influence of the Addition of Selected Spices on Sensory Quality and Biological Activity of Honey
PublikacjaBee honey is nutritious and has numerous health benefits, but its taste is for many people too bland. Honey with addition of spices could be important to the food industry as a functional product with positive health image and interesting taste. Such product would definitely meet health-driven consumers’ expectations. Therefore, the aim of this study was to evaluate the effect of addition of selected spices on sensory, antimicrobial,...
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Synthesis and antiproliferative activity of new mycophenolic acid conjugates with adenosine derivatives
PublikacjaNew conjugates of mycophenolic acid (MPA) and adenosine derivatives were synthesized and assessed as potential immunosuppressants on Jurkat cell line and peripheral blood mononuclear cells (PBMC) from healthy donors. As compared to MPA, all compounds were found to be more active against Jurkat cell line. The antiproliferative activities were compared with MPA and adenosine, in both 2′,3′-O-isopropylidene protected and free hydroxyl...
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The Relation Between Art and Physical Activity in the Public Space of the Contemporary City
PublikacjaArt has always been and still is a mirror in which human activity is reflected. One of the basic human activities is physical activity, thanks to which humans are able to satisfy their needs, improve health and also function in society. Therefore, there are different relationships between physical activity and art. Both of them are present in the public space of cities and this aspect of connection is addressed in the article. The...
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Synthesis and Cholinesterase Inhibitory Activity of N-Phosphorylated /N-Tiophosphorylated Tacrine
PublikacjaNovel phosphorus and thiophosphorus tacrine derivatives were designed, synthesized and their biological activity and molecular modeling was investigated as a new potential anti-Alzheimer's disease (AD) agents. All new synthesized compound exhibited lower toxicity against neuroblastoma cell line (SH-SY5Y) in comparison with tacrine. Two analogues in the series, 7 and 9, demonstrated lack of cytotoxicity against hepatocellular cells...
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Method for Clustering of Brain Activity Data Derived from EEG Signals
PublikacjaA method for assessing separability of EEG signals associated with three classes of brain activity is proposed. The EEG signals are acquired from 23 subjects, gathered from a headset consisting of 14 electrodes. Data are processed by applying Discrete Wavelet Transform (DWT) for the signal analysis and an autoencoder neural network for the brain activity separation. Processing involves 74 wavelets from 3 DWT families: Coiflets,...
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Chemical Aspects of Biological Activity of Isothiocyanates and Indoles, the Products of Glucosinolate Decomposition
PublikacjaThere is growing evidence that cancer chemoprevention employing natural, bioactive compounds may halt or at least slow down the different stages of carcinogenesis. A particularly advantageous effect is attributed to derivatives of sulfur-organic phytochemicals, such as glucosinolates (GLs) synthesized mainly in Brassicaceae plant family. GLs are hydrolysed enzymatically to bioactive isothiocyanates (ITC) and indoles, which exhibit strong...
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Synthesisand cytotoxic activity of conjugates of muramyl and normuramyl dipeptides with batracylin derivatives
PublikacjaOpisano syntezę analogów MDP oraz nor-MDP modyfikowanych w części peptydowej batracyliną i pochodnymi batracyliny. Opracowano udoskonaloną metodę syntezy batracyliny. Zaproponowana metoda pozwala na otrzymanie BAT w skali multi-gramowej. Zsyntetyzowane analogi nie wykazały aktywności cytotoksycznej w badaniach prowadzonych w NCI (Bethesda, USA). W testach in vitro przeprowadzonych w Akademii Medycznej w Gdańsku dwa analogi redukowały...
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Synthesis and antitumor activity of conjugates of muramyldipeptide or normuramyldipeptide with hydroxyacridine/acridone derivatives
PublikacjaOpisano syntezę analogów MDP oraz nor-MDP modyfikowanych w części peptydowej pochodnymi hydroksyakrydyny/akrydonu i dwóch analogów modyfikowanych pochodnymi 1-nitro-9-hydroksyetylo(propylo)aminoakrydyny. Tylko związki zawierające pochodne 1-nitro-9-hydroksyetylo(propylo)aminoakrydyny wykazały wysoką aktywność cytotoksyczną badaną na 60 liniach ludzkich komórek nowotworowych, na nowotwór prostaty i AIDS-related lymphoma (ARL). Związek...
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International Journal of Entrepreneurial Behaviour & Research
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Photoelectrochemical activity of visible light-responsive BiVO4@La1-xSrxFeO3-δ (x = 0, 0.2, 0.4) heterojunction architectures – Optimizing activity by tuning Fe O bond in perovskites
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Paweł Ziemiański dr
OsobyPaweł Ziemiański - adiunkt na Wydziale Zarządzania i Ekonomii Politechniki Gdańskiej. Jego zainteresowania badawcze dotyczą przedsiębiorczości, zespołów przedsiębiorczych oraz negatywnych aspektów (ciemnej strony) przedsiębiorczości. Prowadził również badania dotyczące psychologicznych aspektów sprawowania władzy w organizacjach. W działalności dydaktycznej interesuje go praca ze studium przypadku. Brał udział w szkoleniu z nauczania...
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Activity and discrimination against women in the labour market in the countries of Baltic Sea Region
PublikacjaAn increasing participation of women in the labour market seem to be a key to overcome the problems of the EU labour market and to achieve the objectives of Strategy Europe 2020. Therefore, the objective of this paper is to identify differences in the situation of women in the labour market in selected countries such as those in the Baltic Sea region and to attempt to verify the hypothesis of the existence of discrimination against...
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Phosphate tricyclic coumarin analogs as steroid sulfatase inhibitors: synthesis and biological activity.
PublikacjaIn the present work, we report convenient methods for the synthesis and biological evaluation of phosphate tricyclic coumarin derivatives as potential steroid sulfatase inhibitors. The described synthesis includes the straightforward preparation of 7-hydroxy-2,3-dihydro-1H-cyclopenta[c]chromen-4-one, 3-hydroxy-7,8,9,10-tetrahydro-6H-benzo[c]chromen-6-one and 3-hydroxy-8,9,10,11-tetrahydro-7H-cyclohepta[c]chromen-6-one modified...
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Preparation of silver nanoparticles in reverse micelles and antibacterial activity of silver modified-paints
PublikacjaW publikacji została opisana metoda otrzymywania nanocząstek srebra oraz farb modyfikowanych srebrem i ich wpływ na zahamowanie rozwoju wybranych bakterii i grzybów. Podjęto również próbę porównania wpływu rodzaju prekursora srebra oraz substancji powierzchniowo czynnej na stabilność otrzymanych nanocząstek srebra. Przygotowane mikroemulsje zawierały od 500 do 2000 ppm srebra
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Structural features responsible for control of the eukaryotic GlcN-6-P synthase activity
PublikacjaGlucosamine-6-phosphate (GlcN-6-P) synthase is responsible for catalysis of the first and practically irreversible step in hexosamine metabolism. As UDP-GlcNAc, the final product of the hexosamine path, constitutes one of the essential substrates for assembly of bacterial and fungal cell walls, the enzyme is an interesting target for antimicrobial therapy.The structure of E. coli enzyme, known since 2001, forms a dimer of two identical...
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Electrochemical activity of composite material poly(3,4-ethylenedioxythiophene) modified by silver hexacyanoferrate
PublikacjaW pracy przedstawiono sposób slektrochemicznj syntezy materiału składającego się z polimeru przewodzącego poli(3,4-etylenodioksytiofen) (pEDOT) i nieorganicznej sieci typu redox heksacyjanożelazianu srebra (Aghcf). Materiał otrzymano na drodze dwuetapowej. Etap pierwszy polega na galwanostatycznej redukcji srebra na elektrodzie z węgla szklistego. Etap drugi to roztwarzanie srebra z jednoczesną polimeryzacją monomeru. Otrzymany...
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Comparison of the contents of bioactive compounds and the level of antioxidant activity in different kiwifruit cultivars
PublikacjaGłównym celem prowadzonych badań było stwierdzenie która z odmian owoców kiwi (''Hayward'', ''Daeheuhg'', ''Haenam'' oraz ''Bidan'') jest najbardziej odpowiednią z punktu widzenia konsumpcji przez człowieka. Z tego powodu w odpowiednio przygotowanych próbkach ekstraktów z owoców kiwi oznaczono:- profile związków bioaktywnych;- poziomy aktywności przeciwutleniającej. Wyniki pomiarów zawartości polifenoli (flawonoidy oraz kwasy fenolowe)...
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Developments in the synthesis and biological activity of Glycyl-L-Histydyl-L-Lysine derivatives
PublikacjaWe emphasize on the methods of the synthesis described in the literature and present the aspects of Gly-His-Lys structure modifications that played a key role in scientific research.
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Synthesis of Usnic Acid Derivatives and Evaluation of Their Antiproliferative Activity against Cancer Cells
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Effect of self-assembly on antimicrobial activity of double-chain short cationic lipopeptides
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Effect of extraction method on the antioxidative activity of ground elder (Aegopodium podagraria L.)
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Actions of a nitric oxide donor on prostaglandin production and angiogenic activity in the equine endometrium
PublikacjaNitric oxide (NO) plays an important role in prostaglandin secretion and angiogenesis in the reproductive system. In the present study, the roles of the NO donor spermine NONOate and tumour necrosis factor-alpha (TNF; as a positive control) in prostaglandin production and angiogenic activity of equine endometria during the oestrous cycle were evaluated. In addition, the correlation between NO production...
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Lysozyme increases bactericidal activity of ceragenin CSA-13 against Bacillus subtilis
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Enhanced Suppressive Activity of Regulatory T Cells in the Microenvironment of Malignant Pleural Effusions
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Use of magnetic nanoparticles as a drug delivery system to improve chlorhexidine antimicrobial activity
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Whole-Body Cryotherapy Increases the Activity of Nitric Oxide Synthase in Older Men
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<p>Analysis of toxicity and anticancer activity of micelles of sodium alginate-curcumin</p>
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Impact of paint matrix composition and thickness of paint layer on the activity of photocatalytic paints
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Cinnamon powder: an in vitro and in vivo evaluation of antifungal and plant growth promoting activity
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Photocatalytic activity of anatase powders for oxidation of methylene blue in water and diluted NO gas
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Spectroscopic and Spectroelectrochemical Studies on Redox Properties of Zinc Sulfide and Their Consequences on Photocatalytic Activity
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