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Wyświetlanie 1-15 z 230
Tytuł:
Contribution of the intra- and intermolecular routes in autocatalytic zymogen activation: application to pepsinogen activation
Autorzy:
Varón, Ramón
Fuentes, Matilde
García-Moreno, Manuela
Garcìa-Sevilla, Francisco
Arias, Enrique
Valero, Edelmira
Arribas, Enrique
Powiązania:
https://bibliotekanauki.pl/articles/1041258.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
intermolecular activation
intramolecular activation
autocatalysis
enzyme kinetics
proenzyme activation
Opis:
Taking as the starting point a recently suggested reaction scheme for zymogen activation involving intra- and intermolecular routes and the enzyme-zymogen complex, we carry out a complete analysis of the relative contribution of both routes in the process. This analysis suggests the definition of new dimensionless parameters allowing the elaboration, from the values of the rate constants and initial conditions, of the time course of the contribution of the two routes. The procedure mentioned above related to a concrete reaction scheme is extrapolated to any other model of autocatalytic zymogen activation involving intra- and intermolecular routes. Finally, we discuss the contribution of both of the activating routes in pepsinogen activation into pepsin using the values of the kinetic parameters given in the literature.
Źródło:
Acta Biochimica Polonica; 2006, 53, 2; 407-420
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mechanism of azide activation of polyphenol oxidase II from tobacco.
Autorzy:
Shi, Chunhua
Liu, Qingliang
Dai, Ya
Xie, Yongshu
Xu, Xiaolong
Powiązania:
https://bibliotekanauki.pl/articles/1043711.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
polyphenol oxidase (PPO)
azide activation
peroxide activation
superoxide activation
copper proteins
Opis:
So far, azide has been consistently reported to act as an inhibitor of metal enzymes, especially copper proteins. The present work shows that azide can also act as an activator of polyphenol oxidase II (PPO II) from tobacco leaves. From0 the square-wave voltammetry of native PPO II, peroxide-PPO II complex and azide-PPO II complex, the reduction of nitro blue tetrazolium by the enzymes and activation of PPO II by peroxide it follows that the binding of azide to PPO II induces the formation of CuO(2)(2-)Cu in the active site of PPO II from CuO(2)(-)Cu in native PPO II. The reason for azide acting as an activator can be attributed to azide complexing with PPO II, thus inducing the formation of CuO(2)(2-)Cu, which is the active site of the peroxide-PPO II complex in which peroxide plays the role of activator.
Źródło:
Acta Biochimica Polonica; 2002, 49, 4; 1029-1035
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the emission rate for the 14 MeV neutron generator with the use of radio-yttrium
Autorzy:
Laszynska, E.
Jednorog, S.
Ziolkowski, A.
Gierlik, M.
Rzadkiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/146115.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
14 MeV neutron generator
activation method
yttrium activation
Opis:
The neutron emission rate is a crucial parameter for most of the radiation sources that emit neutrons. In the case of large fusion devices the determination of this parameter is necessary for a proper assessment of the power release and the prediction for the neutron budget. The 14 MeV neutron generator will be used for calibration of neutron diagnostics at JET and ITER facilities. The stability of the neutron generator working parameters like emission and angular homogeneity affects the accuracy of calibration other neutron diagnostics. The aim of our experiment was to confi rm the usefulness of yttrium activation method for monitoring of the neutron generator SODERN Model: GENIE 16. The reaction rate induced by neutrons inside the yttrium sample was indirectly measured by activation of the yttrium sample, and then by means of the γ-spectrometry method. The pre-calibrated HPGe detector was used to determine the yttrium radioactivity. The emissivity of neutron generator calculated on the basis of the measured radioactivity was compared with the value resulting from its electrical settings, and both of these values were found to be consistent. This allowed for a positive verifi cation of the reaction cross section that was used to determine the reaction rate (6.45 × 10–21 reactions per second) and the neutron emission rate (1.04 × 108 n·s–1). Our study confi rms usefulness of the yttrium activation method for monitoring of the neutron generator.
Źródło:
Nukleonika; 2015, 60, 2; 319-322
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boride Layer Growth Kinetics of AISI H13 Steel Borided with Nano-Sized Powders
Autorzy:
Karakaş, M. S.
Günen, A.
Kanca, E.
Yilmaz, E.
Powiązania:
https://bibliotekanauki.pl/articles/351842.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
boriding
growth kinetics
activation energy
Opis:
Growth kinetics of boride layers in AISI H13 steel was investigated using the pack boriding method at temperatures of 1073, 1173 and 1273 K (800°C, 900°C and 1000°C) for periods of 2, 4 and 6 h with nano-sized boron (NB) and micron-sized Ekabor II powders as boriding agents. The total thickness of the boride layer (including both FeB and Fe2B) after boriding at 1273 K (1000°C) for 6 h was 103.8 μm and 96.5 μm for the NB and Ekabor II specimens, respectively. X-ray diffraction analysis of the boride layers on the surfaces borided with NB and Ekabor II revealed the presence of FeB and Fe2B phases with sawtooth morphology. The FeB/Fe2B volume ratio was higher in the specimens borided with NB. The thickness of the boride layer (FeB + Fe2B) increased with the increasing boriding temperature and time. The FeB layer in the NB specimen displayed a (002) preferred orientation.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 159-165
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The surface features of activated stibnite surface with copper or lead ion
Autorzy:
Cao, Q.
Huang, Y.
Zou, H.
Wen, S.
Powiązania:
https://bibliotekanauki.pl/articles/110393.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
stibnite
flotation
activation
active layer
Opis:
Cu2+ and Pb2+ are widely used as activators for the flotation of stibnite. In this work, by the treatment of Cu2+ or Pb2+, the activation product and the thickness of activation layer on the stibnite surface were both investigated. Based on the flotation results, zeta potential analysis and X-ray photoelectron spectroscopy (XPS) study, it was found that Cu2+ was reduced to Cu+ at the stibnite surface and a layer of Cu2S was formed at the surface. While, a PbS layer presenting at the stibnite surface is responsible for the activation flotation of stibnite with Pb2+. Time of flight secondary ion mass spectrometry (TOF-SIMS) analysis further implies that, when stibnite was activated with 5×10-5 mol/dm3 of CuSO4 or Pb(NO3)2, the thickness of Cu2S layer on the Cu-activated surface was close to 2.7 nm, while the thickness of PbS layer was about 1.8 nm on the Pb-activated surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 763-770
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast Neutron Activation Analysis of gold by inelastic scattering, 197Au(n,ngamma)197Aum, by means of Plasma Focus device
Autorzy:
Verri, G.
Mezzetti, F.
Da Re, A.
Rapezzi, L.
Gribkov, V.
Powiązania:
https://bibliotekanauki.pl/articles/146754.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
activation
gold
neutron
plasma focus
Opis:
The application of a Fast Neutron Activation Analysis (FNAA) technique on samples of pure gold, irradiated by a plasma focus of 7 kJ, has been investigated. The reaction was the inelastic scattering of neutrons, 197Au(n,n'gamma)197Aum. To avoid problems connected with peculiar features of the neutron emission from this kind of source, a preliminary standardisation of the method has been carried out. The results obtained have a practical interest in view of possible applications to the technology of extraction of minerals.
Źródło:
Nukleonika; 2000, 45, 3; 189-191
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of thermally activated shape memory alloy reinforced laminated beams
Dynamika termicznie uaktywnianej belki laminowanej wzmocnionej włóknami z pamięcią kształtu
Autorzy:
Pietrzakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/281096.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
laminate
thermal activation
natural frequencies
Opis:
A way of use of shape memory alloy (SMA) fibers for dynamics response modification of laminated beams is presented in the paper. The considered concept of adaptive control is based on the ability to change the Young modulus during a temperature activated, reversible, martenstic transition that is specific to SMAs. It is assumed that the laminate is midplane symmetric and the corresponding layers of the same fiber orientation are activated simultaneously, and the SMA fibers can freely elongate in the matrix. A cantilever laminated beam with mass distributed on its free edge is subject to numerical analysis. Due to the quasi-steady one-dimensional model of heat conduction, martensite fraction and natural frequency time relations for the phase transition of SMA have been obtained. The influence of temperature on natural frequencies of the system has been analysed for some different locations of activated plies and directions of SMA fibers. The frequency response functions varying with the material phase transformation for a harmonic load acting on the free end of the beam have also been presented.
W pracy przedstawiono zastosowanie włókien ze stopu z pamięcią kształtu (SMA) do modyfikacji właściwości dynamicznych belek laminowanych. Koncepcję adaptacyjnego sterowania oparto na unikalnej zdolności stopów SMA do wyraźnej zmiany wartości modułu Younga w procesie odwracalnej przemiany martenzytycznej wywołanej temperaturą. Założono, że warstwy laminatu są ułożone i uaktywniane symetrycznie względem powierzchni środkowej, a włókna SMA mogą swobodnie odkształcać się w osnowie. Symulacja numeryczna dotyczy belki laminowanej utwierdzonej wzdłuż jednego brzegu, z masą równomiernie rozłożoną na swobodnym, przeciwległym brzegu. Zgodnie z przyjętym stacjonarnym, jednowymiarowym modelem przewodnictwa cieplnego, wyznaczono przebiegi czasowe temperatury i zawartości martenzytu we włóknach SMA, oraz przebiegi podstawowej częstości własnej w zakresie przemiany fazowej. Zbadano wpływ temperatury na częstości własne zmieniając położenie warstw uaktwnianych a także kierunek ułożenia włókien SMA. Zakładając wymuszenie harmoniczne działające na swobodny brzeg belki, wyznaczono charakterystyki amplitudowo-częstotliwościowe odpowiadające pełnemu zakresowi transformacji fazy materiałowej.
Źródło:
Journal of Theoretical and Applied Mechanics; 1998, 4; 879-893
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activity and Needs of Seniors – Research Report in Chorzów
Autorzy:
Gierek, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1197952.pdf
Data publikacji:
2018-02-01
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
social activation
senior
free time
Opis:
RESEARCH OBJECTIVE: The aim of this study is to present seniors’ opinions about their activity and ways to meet seniors’ needs. THE RESEARCH PROBLEM AND METHODS: The research problem was centered around: participation in senior social life; forms of activity undertaken by seniors; ways to spend free time by seniors and the needs of the elderly. Survey was used as the research method. The studies were diagnostic and exploratory. THE PROCESS OF ARGUMENTATION: The progressive demographic change in Polish society makes active and active aging more active and the elderly’s needs for care and support become a major stimulus for satisfaction and quality of life. The article reviews the opinions of seniors about their activity and ways of meeting their needs. RESEARCH RESULTS: This study has shown that participation in social life, forms of activity and the needs of the elderly in various ways are met and implemented. Seniors indicating inactivity (in this study are mainly social welfare beneficiaries) generally declare that they feel socially excluded. These people choose a type of home and solitary activity, and spending their free time is mainly based on watching TV and listening to the radio. On the other hand, active seniors (in this study are mainly participants in senior clubs) are satisfied with their role in society. Free time is spent on meetings with people, e.g. in the club and prefer to take various activities. Research also shows that various forms of senior activism, including senior ones, have an impact on the quality of life of the elderly, significantly improving their activity, while addressing higher needs and counteracting social exclusion. CONCLUSIONS, INNOVATIONS AND RECOMENDATIONS: There is a need for more intensified action by aid institutions, directed towards seniors who are inactive, excluded – social welfare clients, so that they too can live in the “autumn of life.” Training should also be provided to social workers who equip tchem with the necessary knowledge and skills to work effectively with the seniors and to effectively and effectively reintegrate and reintegrate them.
Źródło:
Horyzonty Wychowania; 2017, 16, 40; 127-145
1643-9171
2391-9485
Pojawia się w:
Horyzonty Wychowania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of xanthate adsorption on chrysocolla surface via sodium diethyldithiocarbamate (DDTC) modification
Autorzy:
Liu, Dan
Wang, Daqian
Xian, Yongjun
Tian, Xiaosong
Wen, Shuming
Powiązania:
https://bibliotekanauki.pl/articles/2175423.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chrysocolla
flotation
diethyldithiocarbamate
modification
activation
Opis:
Chrysocolla is a kind of copper oxide mineral which was difficult to float. In this study, Diethyldithiocarbamate (DDTC) was employed to modify the surface of chrysocolla to improve its xanthate adsorption and floatability. Flotation experiments showed that the DDTC exhibited ability to activate rather than acting as a collector for chrysocolla flotation. After DDTC activation, chrysocolla can be effectively recovered by xanthate. The activation mechanism of DDTC was investigated via Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS). During the activation, DDTC bonded to the surface copper atoms of chrysocolla, and more Cu(II) species on the mineral surface were reduced to Cu(I) species, which caused the formation of larger amounts of Cu active sites as –N–C(=S)S–Cu(II)– and Cu(I) species. The results of the adsorption tests and zeta potential measurements revealed that the DDTC-modified mineral surface reinforced adsorption of xanthate ions, thereby improving the chrysocolla floatability. Therefore, the Cu ions double interaction of DDTC and xanthate on the chrysocolla surfaces enhanced the strength and stability of the hydrophobic layer, resulting in an enhanced hydrophobization of the chrysocolla for its flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 152599
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetics of pearlite spheroidization
Autorzy:
Matusiewicz, P.
Augustyn-Nadzieja, J.
Czarski, A.
Skowronek, T.
Powiązania:
https://bibliotekanauki.pl/articles/352748.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pearlite spheroidization
sterology
activation energy
Opis:
The pearlite spheroidization in Fe-0.76%C high purity steel was investigated. The samples of a coarse pearlite microstructure were isothermal annealed at 700, 680, 660, 640 and 620°C for various times, up to 800 hours. For quantitative description of the spheroidization process stereological parameter, SV (ferrite/cementite interface surface density) was used. The activation energy 104.8±11.4 kJ/mol was found for the spheroidization process. This value shows good agreement with the activation energy for iron and carbon diffusion along a ferrite/cementite interface, so the coupled interface diffusion is the rule-controlling process.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 231-234
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermogravimetry of chitosan with nanofillers
Autorzy:
Puchalska, Anna
Mucha, Maria
Powiązania:
https://bibliotekanauki.pl/articles/1035418.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
activation energy
biopolymers
chitosan
thermogravimetry
Opis:
In the present paper the degradation of chitosan and its blends with hydroxyapatite, nanoclay and nanosilver as well as the impact of those nanofillers added to chitosan on its decomposition at high temperatures are studied. The applied films of thickness 50 μm were obtained by casting the acidic solutions: chitosan and its blends with hydroxyapatite, nanoclay and nanosilver. To mix solutions with nanofillers ultrasounds were applied. To study the thermal degradation we applied thermogravimetry in dynamic and static conditions, which is a method of thermal analysis involving the continuous recording of weight loss Based on experimental data activation energies of thermal decomposition close to a maximum rate loss were calculated using different methods for chitosan and its blends with hydroxyapatite, nanoclay and nanosilver. The addition of three nanofillers mentioned above result in a visual increase of activation energy of thermal degradation process of chitosan due to slower evolution of decomposed gases from chitosan matrix reflected by a slower rate of weight loss.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2011, 16; 31-42
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strengths and Weaknesses of the Polish System of Vocational Guidance and Career Counselling for Convicts on the Example of Occupational Activation Forms
Autorzy:
Becker-Pestka, Daria Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1197770.pdf
Data publikacji:
2019-03-29
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
vocational guidance
career counselling
activation
convicts
Opis:
RESEARCH OBJECTIVE: The aim of the article is to present strengths and weaknesses of the Polish system of vocational guidance and career counselling for convicts on the example of occupational activation forms. The forms are presented in the context of the functionality of the system of career guidance and counselling provided to convicts in Poland, along with entities responsible for its implementation. THE RESEARCH PROBLEM AND METHODS: The research problem has been formulated as the following questions: What are the forms of occupational activation of convicts, considering the context of the functionality of the system of occupational guidance and career counselling for convicts in Poland? The following methods have been applied for the research: an on-line questionnaire survey and a free-form interview with targeted questions. THE PROCESS OF ARGUMENTATION: In the introductory part of the article the term of vocational guidance and career counselling is explained. Then the career counselling system in Poland is characterised. The considerations presented in the article are focused on strengths and weaknesses of vocational guidance and career counselling for convicts. RESEARCH RESULTS: The analysis refers the career guidance and counselling system for convicts. It also indicates a necessity of synergy which would incorporate all the elements into one system. CONCLUSIONS, INNOVATIONS, AND RECOMMENDATIONS: Considering economic and social aspects, the functionality of the system of career guidance and counselling for convicts is highly significant. Occupational activation of convicts contributes to the prevention of recidivism and it allows them to find employment after they leave prison.
Źródło:
Horyzonty Wychowania; 2018, 17, 44; 41-48
1643-9171
2391-9485
Pojawia się w:
Horyzonty Wychowania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activation of dendritic cells by nematode antigens during colitis
Autorzy:
Maruszewska-Cheruiyot, M.
Donskow-Lysoniewska, K.
Piechna, K.
Powiązania:
https://bibliotekanauki.pl/articles/5777.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
dendritic cell
activation
nematode
antigen
colitis
Źródło:
Annals of Parasitology; 2016, 62, Suppl.
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the activity of irradiated graphite in the Ignalina Nuclear Power Plant RBMK-1500 reactor
Autorzy:
Ancius, D.
Ridikas, D.
Remeikis, V.
Plukis, A.
Plukiene, R.
Cometto, M.
Powiązania:
https://bibliotekanauki.pl/articles/148874.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
modeling
activation analysis
radioactive waste
graphite
Opis:
Ignalina NPP Unit 1 with the RBMK-1500 type reactor enters the preparatory stage for its decommissioning. A big volume of graphite has to be dismantled and managed. This paper evaluates the composition of radionuclides in irradiated graphite on the basis of the calculation scheme with computer codes MCNPX and CINDER'90. Full scale calculations take into account the whole energy spectrum of neutrons, the spatial neutron flux in different reactor structures and the impurities of RBMK-1500 graphite measured by two independent methods. Principal contributors to the total activity as well as other radionuclides important from the radiological point of view are identified. The uncertainties of such calculations are discussed.
Źródło:
Nukleonika; 2005, 50, 3; 113-120
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic stability of electrorheological fluid-filled laminate
Autorzy:
Tylikowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/279753.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
dynamic stability
electrorheological fluids
electrical activation
Opis:
In the present paper the technique of the dynamic stability analysis proposed for conventional laminated structures is extended to cover the activated electrorheological fluid-filled beam under the time-dependent axial loading. The thin simmetrically laminated structure consists of the uniform beam and the multi-cell chains containing the electrorheological fluid in an extensional configuration. Changing the electric field on the cell electrodes modifies basic mechanical properties such as Young's modulus, and the retardation time. The present paper aims at analysis of the classical stability domains of the beam. In order to derive the dynamic stability criteria the Liapunov functional as a sum of the modified kinetic energy and the elastic energy of the beam is chosen. The stability regions as functions of loading characteristics, damping coefficient are given.
Dynamiczna stateczność laminatu z cieczą elektroreologiczną. Praca dotyczy analizy klasycznego zagadnienia stateczności belki wypełnionej cieczą elektroreologiczną w celu odpowiedzi na pytanie: jak elektryczna aktywacja cieczy zamienia obszary stateczności. Ciecz elektroreologiczną opisano modelem standardowym i modelem cieczy Oldroyda o współczynnikach zależnych od przyłożonego pola elektrycznego. W celu wyprowadzenia kryteriów stateczności posłużono się bezpośrednią metodą Lapunowa.
Źródło:
Journal of Theoretical and Applied Mechanics; 2000, 38, 2; 417-428
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
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