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Wyświetlanie 1-11 z 11
Tytuł:
Ocena aktywności biologicznej karboksymetylowanych pochodnych alfa-(1→3)-glukanów wyizolowanych z owocników uprawnych gatunków boczniaka (pleurotus)
Assessing biological activity of carboxymethylated derivatives of alpha-(1→3)-glucans isolated from fruiting bodies of cultivated pleurotus species
Autorzy:
Wiater, A.
Paduch, R.
Prochniak, K.
Pleszczynska, M.
Siwulski, M.
Bialas, W.
Szczodrak, J.
Powiązania:
https://bibliotekanauki.pl/articles/828789.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Technologów Żywności
Opis:
α-(1→3)-Glukany stanowią najmniej poznaną grupę polisacharydów budujących ścianę komórkową grzybów. Celem pracy była ocena aktywności biologicznej karboksymetylowanych pochodnych α-(1→3)-glukanów uzyskanych z owocników uprawnych gatunków rodzaju Pleurotus (P. citrinopileatus, P. djamor, P. erynii i P. precoce). Polisacharydy wyizolowane z owocników poddano analizom strukturalnym (FT-IR i ¹H NMR), w wyniku czego wykazano, że są one liniowymi α-(1→3)-glukanami. Po zastosowaniu metody karboksymetylacji nierozpuszczalne w wodzie α-(1→3)-glukany przeprowadzono w formy rozpuszczalne, tj. karboksymetyl-α-(1→3)-glukany (KM-α-(1→3)-glukany). Następnie analizowano ich wpływ na żywotność komórek prawidłowych CCD 841 CoTr (ludzkie komórki nabłonka jelita grubego) i CCD-18Co (miofibroblasty jelitowe) oraz komórek nowotworowych HeLa (ludzki rak szyjki macicy). Wykonano analizy aktywności metabolicznej i toksyczności (MTT i NR) oraz zdolności do redukcji wolnych rodników (DPPH). Wykazano, że żywotność komórek nowotworowych była najsilniej redukowana przez KM-α-(1→3)-glukan otrzymany z owocników P. citrinopileatus. Z kolei metodą NR wykazano, że wszystkie badane KM-α-glukany w całym zakresie stężeń powodowały statystycznie istotny wzrost żywotności komórek prawidłowych (CCD 841 CoTr i CCD-18Co). Badane KM-α-glukany nie wykazywały aktywności zmierzającej do redukcji wolnych rodników tlenowych. Na podstawie analizy wyników różnicowego barwienia fluorescencyjnego stwierdzono, że KM-α-glukan z owocników P. citrinopileatus zaburza integralność błony komórek nowotworowych. Z kolei barwienie fluorescencyjne filamentów F-aktynowych (F-aktyny) wykazało, że nie wpływał on destrukcyjnie na cytoszkielet badanych komórek.
α-(1→3)-Glucans constitute the least known group of polysaccharides that make up the fungal cell wall. The objective of the study was to assess the biological activity of carboxymethylated derivatives of α-(1→3)-glucans extracted from fruiting bodies of the cultivated species of Pleurotus (P. citrinopileatus, P. djamor, P. erynii, and P. precoce) genus. The polysaccharides extracted from the fruiting bodies were structurally analyzed (using FT-IR and ¹H NMR) and, based on the analysis results, it was proved that they were linear α-(1→3)-glucans. With the use of a carboxymethylation method, the water-insoluble α-(1→3)-glucans were converted into soluble forms, i.e. carboxymethyl-α-(1→3)-glucans (KM-α-(1→3)-glucans). Next, their effect was investigated on the viability of normal CCD 841 CoTr cells (normal human colonic epithelial cells), CCD-18Co (intestinal myofibroblasts), and HeLa tumour cells (human cervical cancer). The metabolic activity, toxicity (MTT and NR), and free radical scavenging ability (DPPH) were analyzed. It was shown that the effect of KM-α-(1→3)-glucan derived from the P. citrinopileatus fruiting bodies was the strongest as regards the reduction of the cancer cell viability. Then, the NR method used showed that all the tested KM-α-(1→3)-glucans within the entire concentration range caused the viability of normal cells (CCD 841 CoTr and CCD-18Co) to increase statistically significantly. The KM-α-glucans analyzed did not exhibit any free oxygen radical reduction activity. Based on the results of the differential fluorescent staining analysis, it was confirmed that the KM-α-glucan from fruiting bodies of P. citrinopileatus disturbed the membrane integrity of tumour cells. On the other hand, the fluorescent staining of the F-actin filaments proved that this KM-α-glucan did not have any destructive effect on the cytoskeleton of the cells studied.
Źródło:
Żywność Nauka Technologia Jakość; 2015, 22, 1
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fruiting bodies of Hericium erinaceus (Bull.) Pers. - a new source of water-insoluble (1→3)-alfa-d-glucan
Autorzy:
Wiater, A.
Choma, A.
Komaniecka, I.
Pleszczynska, M.
Siwulski, M.
Polak, p.
Janusz, G.
Szczodrak, J.
Powiązania:
https://bibliotekanauki.pl/articles/56606.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
A water-insoluble polysaccharide (WIP) was isolated from the fruiting bodies of Hericium erinaceus HE01 by an alkaline solution with the yield of 5%. Structural and compositional analyses by total acid hydrolysis, methylation analysis, FT-IR, FT-Raman, and ¹H NMR spectroscopy as well as other instrumental techniques showed predominantly glucose linked by α-glycosidic bonds and small amounts of mannose, xylose, rhamnose, galactose, and ribose. The methylation analysis showed that (1→3)-linked Glcp is the major constituent (70.8%) of the polymer, while the 3,4 substituted d-Glcp represents the main branching residue of the glucan. The presence of (1→3)-α-d-glucan in the hyphae of H. erinaceus was additionally confirmed by the use of specific fluorophore-labeled antibodies.
Źródło:
Acta Societatis Botanicorum Poloniae; 2016, 85, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Creating Acoustic Maps Employing Supercomputing Cluster
Autorzy:
Czyżewski, A.
Kotus, J.
Szczodrak, M.
Powiązania:
https://bibliotekanauki.pl/articles/177400.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise pollution
acoustic noise monitoring
noise propagation model
supercomputing
acoustic maps
Opis:
The implemented online urban noise pollution monitoring system is presented with regard to its conceptual assumptions and technical realization. A concept of the noise source parameters dynamic assessment is introduced. The idea of noise modeling, based on noise emission characteristics and emission simulations, was developed and practically utilized in the system. Furthermore, the working system architecture and the data acquisition scheme are described. The method for increasing the speed of noise map calculation employing a supercomputer is explained. The practical implementation of noise maps generation and visualization system is presented, together with introduced improvements in the domain of continuous noise monitoring and acoustic maps creation. Some results of tests performed using the system prototype are shown. The main focus is put on assessing the efficiency of the acoustic maps created with the discussed system, in comparison to results obtained with traditional methods.
Źródło:
Archives of Acoustics; 2011, 36, 2; 395-418
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distrubuted system for noise threat evaluation based on psychoacoustic measurements
Autorzy:
Kotus, J.
Szczodrak, M.
Czyżewski, A.
Kostek, B.
Powiązania:
https://bibliotekanauki.pl/articles/220609.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise
environmental noise
dosimetry
measurements
Opis:
An innovative system designed for the continuous monitoring of acoustic climate of urban areas was presented in the paper. The assessment of environmental threats is performed using online data, acquired through a grid of engineered monitoring stations collecting comprehensive information about the acoustic climate of urban areas. The grid of proposed devices provides valuable data for the purpose of long and short time acoustic climate analysis. Dynamic estimation of noise source parameters and real measurement results of emission data are utilized to create dynamic noise maps accessible to the general public. This operation is performed through the noise source prediction employing a propagation model being optimized for computer cluster implementation requirements. It enables the system to generate noise maps in a reasonable time and to publish regularly map updates in the Internet. Moreover, the functionality of the system was extended with new techniques for assessing noise-induced harmful effects on the human hearing system. The principle of operation of the dosimeter is based on a modified psychoacoustic model of hearing and on the results of research performed with participation of volunteers concerning the impact of noise on hearing. The primary function of the dosimeter is to estimate, in real time, auditory effects which are caused by exposure to noise. The results of measurements and simulations performed by the system prototype are depicted and analyzed. Several cases of long-term and short-term measurements of noise originating from various sources were considered in detail. The presented outcomes of predicted degree of the hearing threshold shift induced during the noise exposure can increase the awareness of harmfulness of excessive sound levels.
Źródło:
Metrology and Measurement Systems; 2012, 19, 2; 219-230
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of a noise mapping tool deployed in grid infrastructure for creating noise maps of Urban areas
Autorzy:
Szczodrak, M.
Kotus, J.
Czyżewski, A.
Kostek, B.
Powiązania:
https://bibliotekanauki.pl/articles/305743.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
noise map
noise modeling
grid computing
noise
Opis:
The concept and implementation of the system for creating dynamic noise maps in PL-Grid infrastructure are presented. The methodology of dynamic acoustical map screating is introduced. The concept of noise mapping, based on noise source and propagation models, was developed and employed in the system. The details of incorporation of the system to the PL-Grid infrastructure are presented. The results of simulations performed by the system prototype are depicted. The results in the form of noise maps obtained by a system are compared with some other solutions in order to investigate accuracy.
Źródło:
Computer Science; 2013, 14 (2); 231-242
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound Intensity Distribution Around Organ Pipe
Autorzy:
Odya, P.
Kotus, J.
Szczodrak, M.
Kostek, B.
Powiązania:
https://bibliotekanauki.pl/articles/177568.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
organ pipe
acoustic vector sensor
sound intensity
Cartesian robot
Opis:
The aim of the paper was to compare acoustic field around the open and stopped organ pipes. The wooden organ pipe was located in the anechoic chamber and activated with a constant air flow, produced by an external air-compressor. Thus, a long-term steady state response was possible to obtain. Multichannel acoustic vector sensor was used to measure the sound intensity distribution of radiated acoustic energy. Measurements have been carried out on a defined fixed grid of points. A specialized Cartesian robot allowed for a precise positioning of the acoustic probe. The resulted data were processed in order to obtain and visualize the sound intensity distribution around the pipe, taking into account the type of the organ pipe, frequency of the generated sound, the sound pressure level and the direction of acoustic energy propagation. For the open pipe, an additional sound source was identified at the top of the pipe. In this case, the streamlines in front of the pipe are propagated horizontally and in a greater distance than in a case of the stopped pipe, moreover they are directed downwards. For the stopped pipe, the streamlines of the acoustic flow were directed upwards. The results for both pipe types were compared and discussed in the paper.
Źródło:
Archives of Acoustics; 2017, 42, 1; 13-22
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long-Term Comparative Evaluation of Acoustic Climate in Selected Schools Before and After Acoustic Treatment
Autorzy:
Kotus, J.
Szczodrak, M.
Czyżewski, A.
Kostek, B.
Powiązania:
https://bibliotekanauki.pl/articles/177966.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise measurement
acoustic climate evaluation
acoustic treatment
noise dose
Opis:
The results of long-term continuous noise measurements in two selected schools are presented in the paper. Noise characteristics were measured continuously there for approximately 16 months. Measurements started eight months prior to the acoustic treatment of the school corridors of both schools. An evaluation of the acoustic climates in both schools, before and after the acoustic treatment, was performed based on comparison of these two periods of continuous measurements. The autonomous noise monitoring stations, engineered at the Multimedia Systems Department of the Gdansk University of Technology were used for this purpose. Investigations of measured noise, especially its influence on hearing sense, assessed on ground of spectral analyses in critical bands, is discussed. Effects of occupational noise exposure, including the Temporary Threshold Shift simulation, are determined. The correlation of the above said measurement results with respective instantaneous noise levels is discussed, and concluding remarks are presented. Some additional indicators such as air pollution or video analysis aiming at the analysis of corridor occupancy are also measured. It should be remembered that excessive noise, or air pollution may be evidence of a dangerous event and may pose health risks.
Źródło:
Archives of Acoustics; 2010, 35, 4; 551-564
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Creating Dynamic Maps of Noise Threat Using PL-Grid Infrastructure
Autorzy:
Szczodrak, M.
Kotus, J.
Kostek, B.
Czyżewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/177988.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise
dynamic noise map
reverse engineering
grid computing
Opis:
The paper presents functionality and operation results of a system for creating dynamic maps of acoustic noise employing the PL-Grid infrastructure extended with a distributed sensor network. The work presented provides a demonstration of the services being prepared within the PLGrid Plus project for measuring, modeling and rendering data related to noise level distribution in city agglomerations. Specific computational environments, the so-called domain grids, are developed in the mentioned project. For particular domain grids, specialized IT solutions are prepared, i.e. software implementation and hardware (infrastructure adaptation), dedicated for particular researcher groups demands, including acoustics (the domain grid “Acoustics”). The infrastructure and the software developed can be utilized mainly for research and education purposes, however it can also help in urban planning. The engineered software is intended for creating maps of noise threat for road, railways and industrial sources. Integration of the software services with the distributed sensor network enables automatic updating noise maps for a specific time period. The unique feature of the developed software is a possibility of evaluating auditory effects which are caused by the exposure to excessive noise. The estimation of auditory effects is based on calculated noise levels in a given exposure period. The outcomes of this research study are presented in a form of the cumulative noise dose and the characteristics of the temporary threshold shift.
Źródło:
Archives of Acoustics; 2013, 38, 2; 235-242
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multimedialny System Monitorowania Hałasu
Multimedia Noise Monitoring System
Autorzy:
Czyżewski, A.
Kotus, J.
Kostek, B.
Szczodrak, M.
Powiązania:
https://bibliotekanauki.pl/articles/180743.pdf
Data publikacji:
2007
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
hałas
zagrożenie hałasem
system monitorowania hałasu
pomiary hałasu
psychoakustyczny dozymetr hałasu
noise
noise pollution
noise monitoring system
noise measurements
psychoacoustic noise dosimetry
Opis:
W artykule przedstawiono Multimedialny System Monitorowania Hałasu. Projekt jest sieciocentrycznym systemem dedykowanym monitorowaniu zagrożeń hałasem. Jego nadrzędnym celem jest zwiększenie skuteczności w zakresie profilaktyki chorób słuchu. Umożliwia pobieranie, gromadzenie, analizę i wizualizację danych dotyczących hałasu, pobieranych ze zdalnych urządzeń pomiarowych oraz elektronicznych ankiet dostępnych przez Internet. Ponadto w artykule przedstawiono autorską koncepcję psychoakustycznego dozymetru hałasowego. Dozymetr ten umożliwia wyznaczenie czasowego przesunięcia progu słyszenia podczas trwania ekspozycji na hałas. Możliwe jest dzięki temu ciągłe monitorowanie progu słyszenia osób przebywających w warunkach szkodliwego oddziaływania hałasu.
A concept and an implementation of a multimedia computer system for monitoring environmental noise threats is presented. The principal aim of the project was to improve the effectiveness of prophylaxis of hearing diseases. The system makes it possible to receive, store, analyze and visualize noise data coming from noise measurement equipment and from electronic questionnaires accessible through the Internet. Moreover a new concept of psychoacoustic noise dosimetry is also presented. The designed noise dosimeter can assess temporary threshold shift (TTS) during noise exposure. In this way it is possible to monitor the hearing threshold shift continuously for people exposed to harmful noise.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2007, 7/8; 8-11
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A System for Acoustic Field Measurement Employing Cartesian Robot
Autorzy:
Szczodrak, M.
Kurowski, A.
Kotus, J.
Czyżewski, A.
Kostek, B.
Powiązania:
https://bibliotekanauki.pl/articles/221435.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cartesian robot
sound intensity
sound field
anechoic chamber
Opis:
A system setup for measurements of acoustic field, together with the results of 3D visualisations of acoustic energy flow are presented in the paper. Spatial sampling of the field is performed by a Cartesian robot. Automatization of the measurement process is achieved with the use of a specialized control system. The method is based on measuring the sound pressure (scalar) and particle velocity(vector) quantities. The aim of the system is to collect data with a high precision and repeatability. The system is employed for measurements of acoustic energy flow in the proximity of an artificial head in an anechoic chamber. In the measurement setup an algorithm for generation of the probe movement path is included. The algorithm finds the optimum path of the robot movement, taking into account a given 3D object shape present in the measurement space. The results are presented for two cases, first without any obstacle and the other - with an artificial head in the sound field.
Źródło:
Metrology and Measurement Systems; 2016, 23, 3; 333-343
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of Railway Noise—A Case Study
Autorzy:
Szwarc, M.
Kostek, B.
Kotus, J.
Szczodrak, M.
Czyżewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/91183.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
rail traffic noise
national government legislation and regulations
European Community requirements
noise-generating devices
rolling contact noise sources
rail vehicle noise
Opis:
Under Directive 2002/49/EC relating to the assessment and management of environmental noise, all European countries are obliged to model their environmental noise levels in heavily populated areas. Some countries have their own national method, to predict noise but most have not created one yet. The recommendation for countries that do not have their own model is to use an interim method. The Dutch SRM II scheme is suggested for railways. In addition to the Dutch model, this paper describes and discusses 3 other national methods. Moreover, discrepancies between the HARMONOISE and IMAGINE projects are analysed. The results of rail traffic noise measurements are compared with national methods.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 3; 309-325
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-11 z 11

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