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Wyświetlanie 1-15 z 51
Tytuł:
The GSI Heavy Ion Microbeam: A Tool for the Investigation of Cellular Response to High LET Radiations
Autorzy:
Barberet, Ph.
Heiss, M.
Du, G.
Fischer, B. E.
Taucher-Scholz, G.
Powiązania:
https://bibliotekanauki.pl/articles/2044671.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.75.Ak
87.50.-a
Opis:
Since the mid 1990's, an increasing number of charged particle microbeams have been designed to deliver a preset number of ions to individual living cells with the micron resolution. These tools provide a powerful technique to investigate the cellular response to low doses of radiations. During the last years, the single ion hit facility in operation on the GSI microbeam since 1987 has been upgraded for the irradiation of individual living cells in vitro. This setup presents two main peculiarities compared to the microbeams used up to now for cell irradiation. First, the beam's micrometric size is obtained by magnetic focusing and not by a simple collimation. This allows obtaining a smaller beam spot, a better defined linear energy transfer, and a high irradiation throughput. Then, the GSI microbeam is able to focus ions from carbon to uranium with energies between 1.4 MeV/u to 11.4 MeV/u. The range of accessible linear energy transfer is thus considerably extended compared to light ions microbeam in operation today. The design of the GSI microbeam is described, including the beam control, the online cell localisation, the cell dish designed specifically for microbeam irradiation, and the cell irradiation procedures. Experimental tests performed to check the global aiming accuracy as well as the first cellular irradiations are presented.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 329-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer Studies of Cu(II) Ions Interaction with the Non-Heme Iron and Cytochrome b$\text{}_{559}$ in a Chlamydomonas reinhardtii PSI Minus Mutant
Autorzy:
Burda, K.
Kruk, J.
Strzałka, K.
Stanek, J.
Schmid, G. H.
Kruse, O.
Powiązania:
https://bibliotekanauki.pl/articles/2044646.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.39.Jn
82.39.Rt
82.50.Nd
87.15.He
87.64.Pj
89.60.Fe
Opis:
Mössbauer spectroscopy was applied, for the first time, to study the interaction of copper ions with the non-heme iron and the heme iron of cytochrome b$\text{}_{559}$ in photosystem II thylakoids isolated from a Chlamydomonas reinhardtii photosystem I minus mutant. We showed that copper ions oxidize the heme iron and change its low spin state into a high spin state. This is probably due to deprotonation of the histidine coordinating the heme. We also found that copper preserves the non-heme iron in a low spin ferrous state, enhancing the covalence of iron bonds as compared to the untreated sample. We suggest that a disruption of hydrogen bonds stabilizing the quinone-iron complex by Cu$\text{}^{2+}$ is the mechanism responsible for a new arrangement of the binding site of the non-heme iron leading to its more "tense" structure. Such a diamagnetic state of the non-heme iron induced by copper results in a magnetic decoupling of iron from the primary quinone acceptor. These results indicate that Cu does not cause removal of the non-heme iron from its binding site. The observed Cu$\text{}^{2+}$ action on the non-heme iron and cytochrome b$\text{}_{559}$ is similar to that previously observed forα-tocopherol quinone.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 237-247
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silver Nanoparticles as Enhancing Substrates for Raman and Fluorescence Spectroscopy
Autorzy:
Cyrankiewicz, M.
Wybranowski, T.
Kruszewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1196708.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
33.20.Kf
32.50.+d
61.46.Df
73.20.Mf
78.67.Bf
87.83.+a
Opis:
The enhancing properties of silver nanoparticles in surface-enhanced Raman scattering (SERS) and metal-enhanced fluorescence (MEF) are studied in this work. The obtained results confirm that the partial aggregation of nanoparticles leads to a great increase of Raman scattering cross-section but there are significant differences in SERS-activity of colloidal silver treated with various aggregating compounds. The differences are interpreted through the analysis of both experimental and computational results. The same silver colloid covered with silica shell preventing the fluorescence quenching makes possible a several-fold increase in fluorescence emission. The effect strongly depends on thickness of the outer layer of nanoparticles. Geometrical parameters of nanoparticles (radius or radius and thickness of the adsorption layer in core-shell systems) are determined on the basis of the dynamic light scattering (DLS) data and extinction spectra analysis.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-11-A-15
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Vibroacoustic Climate on Driver's Postural Stability for Eyes Closed in Driver's Cabin
Autorzy:
Damijan, Z.
Skrzyniarz, S.
Kwaśniewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1504430.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.40.-a
07.10.-h
46.32.+x
87.50.Y-
Opis:
Several levels of the nervous system are responsible for stability of the vertical position in humans. Three basic inputs are involved: atrial, visual and proprioceptive as well as mechanoreceptors present in the skin. Signals from these inputs control the body posture and its orientation with respect to internal and external reference systems. External systems are formed based on the gravitation field and visual stimuli. Internal systems are generated in the central nervous system by polymodal representations, also referred to as body schema. Some of environmental factors of driver's work place could disturb postural stability. Almost all vehicles are according with actual norms and directives. We investigate how normal week of work has impact on postural stability in new city buses. We concentrate on postural stability for closed eyes. In this paper results of investigation were presented.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 1073-1076
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of General Low Frequency Vibration on Energy Balance of a Human Being
Autorzy:
Damijan, Z.
Uhryński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1177286.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.yt
07.20.-n
Opis:
The work presents the research and analysis concerning general low frequency vibration and its effect on energy balance of a human organism (a comparison with a control group). The research was conducted in two phases: a group exposed to vibration and a control group. An exposed group (28 participants) took part in 19 training sessions, each lasting 20 min, of low frequency vibration (around 3.2 Hz in standing position) applied to each participant at fixed time of the day. Before and after the session, the thermographic images were taken and deep temperature was taken too. The control group (33 participants) also took part in 19 everyday 20-min sessions with no vibrations and only measurements conducted. The results were analysed concerning statistics using Statistica. For the sake of the analysis the significance level was p = 0.05, the parametric T - test, and the non-parametric Kołmogorow-Smirnow tests were used for two groups of independent variables. Having conducted the research and analysis, one can state that 20-min exposure to low frequency vibration results in significant positive changes in chosen parameters.
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 970-973
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of General Low Frequency Vibration on Posture Stability
Autorzy:
Damijan, Z.
Uhryński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1490372.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.40.-a
07.10.-h
46.32.+x
87.50.Y-
Opis:
The work presents the research and analysis concerning general low frequency vibration and its influence on posture stability. The research was conducted in two phases: a group exposed to vibration - August 2006, a control group: November 2006 in Krynica-Zdrój. An exposed group (29 participants/took part in 19 training sessions, each lasting 20 min, of low frequency vibration, standing position) applied to each participant at fixed time of the day. The low frequency vibration amplitude was 4 mm, while the frequency was 3.5 Hz. Before and after the session the posturographic examination of posture stability was conducted. The control group (33 participants) also took part in 19 everyday 20 min sessions with no vibrations and only measurements conducted. The results were analyzed concerning statistics using Statistica. For the sake of the analysis the significance level was p = 0.05, the parametric t-test and the nonparametric Kolmogorov-Smirnov tests were used for two groups of independent variables. Having conducted the research and analysis, one can state that 20 min exposure to low frequency vibration results in significant changes in posture stability and 19 day long vibration training changes significantly the posture stability among the participants. The observed changes were of positive nature. The work introduces research on the possibility of using low-frequency vibration to improve human stability. The results presented concern biophysics in rehabilitation of posture stability and are not often met in specialist literature.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-028-A-031
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Vibroacoustic Environment Conditions on Functional Stability of Drivers
Autorzy:
Damijan, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1537357.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.40.-a
43.80.-n
43.80.-p
87.50.Y-
Opis:
Despite new technological solutions and attempts to improve the working conditions during the operation of vehicles, city bus drivers are still exposed to negative impacts of noise and vibrations. This research project was undertaken in response to the lack of holistic analyses of the environmental factors that might impact on the city bus drivers at work. No extensive major research was done to investigate the influence of the conditions at work on functional stability of bus drivers and basic physiological parameters of the human body (systolic and diastolic pressure, pulse rate, temperature in the ear channel, loading of postural muscles, blood circulation determined with the use of a thermovision camera, fatty tissue content, body mass and physical condition (squeezing and pressing exercises). the main purpose of this research program was to show the impacts that the conditions at work might have on bus drivers or to demonstrate that these impacts do no exist.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 23-26
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Endurance Training and Testosterone Treatment on the Fluorescence Spectra of Rat Serum
Autorzy:
Drzazga, Z.
Schisler, I.
Michnik, A.
Sadowska-Krępa, E.
Kłapcińska, B.
Gibińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398660.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.Dq
87.10.Vg
87.64.-t
87.64.kv
Opis:
The paper presents an investigation into the effects of endurance training and testosterone enanthate (TE) treatment on rat blood serum by fluorescence spectroscopy. Blood serum was collected from adolescent male Wistar rats randomized between the untrained controls and trained animals, either steroid untreated or receiving I.M. injections (8 or 80 mg/$kg_{BW}$) of testosterone enanthate. Fluorescence measurements were performed for undiluted or 20- and 500-fold diluted serum and analysed separately in the ultraviolet and visible light regions. In both regions the impact of the TE administration was more pronounced than the effect of endurance training. Moreover, in the visible region of spectrum, originated from a number of fluorescent metabolites, the influence of studied factors was more noticeable. The opposite effect of endurance training and administration of TE on serum emission was found for a lower (8 mg/$kg_{BW}$) dose of testosterone, whereas a high-dose TE (80 mg/$kg_{BW}$) treatment resulted in a return of fluorescence intensity.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 15-19
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of Barite and Boroncarbide Doped Radiation Shielding Polymer Composite Panels
Autorzy:
Evcin, O.
Evcin, A.
Bezir, N.
Akkurt, İ.
Günoğlu, K.
Ersoy, B.
Powiązania:
https://bibliotekanauki.pl/articles/1031261.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.Gi
94.10.Gb
28.41.Te
78.66.Sq
29.30.Kv
Opis:
Developments in nuclear technology in the last century have lead to the use of radiation in different areas of human activity. These are not just the energetics but also food, agriculture, medicine, industry and science. Thus, radiation has become an inevitable phenomenon in our lives. Since we cannot isolate radiation from our life, the radiation protection methods should be available. As alternatives to conventional radiation prevention methods, such as lead and heavy concrete shielding, more functional materials need to become the focus of research. The development of the least harmful to the environment, easily applicable, flexible radiation shields has become very important. In this study, silicon matrix composite panels, doped with different ratios of barite and boron carbide, were produced and characterized by optical and scanning electron microscopy (SEM). Gamma and neutron radiation shielding properties of these materials were investigated. The results have been compared with the lead as the standard shielding material.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1145-1148
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating Mechanisms of Radiation-Induced DNA Damage Using Low-Energy Photons
Autorzy:
Folkard, M.
Prise, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/2044651.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.-a
Opis:
Central to any mechanistic biophysical model of radiation damage to DNA is the relationship between the amount and distribution of energy deposited in the DNA helix and the subsequent production of DNA damage. It is now clear from a number of studies that the minimum energy required to produce bond breaks in DNA is significantly lower than might be expected. For example, some biophysical models have assumed that it takes several 10s of eV to produce a double-strand break in DNA. However, using low-energy photons, we have shown that energy depositions as low as 7 eV can induce double-strand break and that this is enhanced when the DNA is hydrated, showing that free radical damage is also important.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 265-271
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding Radiation Damage to Cells Using Microbeams
Autorzy:
Folkard, M.
Prise, K. M.
Shao, C.
Gilchrist, S.
Schettino, G.
Michette, A. G.
Vojnovic, B.
Powiązania:
https://bibliotekanauki.pl/articles/2044649.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.75.Ak
87.50.-a
Opis:
Cellular micro-irradiation techniques provide unique experimental opportunities for understanding how ionizing radiation interacts with living cells and tissues. Using microbeams, it is possible to deliver precise doses of radiation to selected individual cells, or sub-cellular targets in vitro. This technique continues to be applied to the investigation of a number of phenomena currently of great interest to the radiobiological community. In particular, it is the study of so-called "non-targeted" effects (where cells are seen to respond indirectly to ionizing radiation) that are benefiting most from the use of microbeam approaches.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 257-264
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Primary Electron Transfer Reactions in Membrane-Bound Open and Closed Reaction Centers from Purple Bacterium Rhodobacter sphaeroides
Autorzy:
Gibasiewicz, K.
Pajzderska, M.
Karolczak, J.
Burdziński, G.
Dobek, A.
Jones, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419491.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.50.-m
87.64.K-
87.15.M-
Opis:
Most ultrafast transient absorption studies of primary electron transfer in reaction centers from purple bacteria have been performed in complexes isolated from their natural lipid membrane environment using detergent. In this contribution we present near-UV-vis transient absorption studies of reaction centers embedded in their natural membrane environment. The evolution of absorption spectra recorded with subpicosecond resolution and reflecting primarily electron transfer reactions has been compared to data obtained previously for isolated reaction centers. We conclude that the overall spectral evolution in both types of samples is similar, and the environment of the reaction center protein has only a minor effect on the primary electron transfer reactions. The differences between the two samples are explained in terms of different energetic levels (and their different temporal evolution) of the two initial charge separated states $P^+B_A^-$ and $P^+H_A^-$, with P being the primary electron donor and $B_A$ and $H_A$ the two consecutive electron acceptors. Additionally, in the electric field generated by $P^+H_A^-,$ $B_A$ in membrane-bound reaction centers undergoes a stronger electrochromic shift than in isolated reaction centers.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 263-268
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mictomagnetic Order in Cd$\text{}_{0.87}$Cr$\text{}_{1.93}$V$\text{}_{0.06}$Se$\text{}_{4}$ Semiconductor
Autorzy:
Groń, T.
Malicka, E.
Zawisza, B.
Duda, H.
Krok-Kowalski, J.
Pacyna, A. W.
Powiązania:
https://bibliotekanauki.pl/articles/2048136.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Jc
75.50.Pp
75.50.Dd
Opis:
The complex ac dynamic magnetic susceptibility was used to study the mictomagnetic-like behavior in polycrystalline Cd$\text{}_{0.87}$Cr$\text{}_{1.93}$V$\text{}_{0.06}$Se$\text{}_{4}$ spinel. The temperature dependences of the zero field in-phase (real part) and out-of-phase (imaginary part) components of fundamental susceptibility measured at the oscillating field H$\text{}_{ac}$ = 0.5 Oe and at the constant frequency of 125 Hz are characteristic for the mictomagnetic order. These results well correlate with the anomalies in the second and third harmonics of the ac susceptibility indicating the cluster glass.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 714-716
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examples of Migration Matrices Models and their Performance in Credit Risk Analysis
Autorzy:
Grzybowska, U.
Karwański, M.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1408978.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.50.Ga
87.55.N-
02.10.Yn
Opis:
Credit risk models used in banks are based on probability models for occurrence of default. A vast class of the models used in practice (e.g., Credit Metrics) is based on the notion of intensity. In 1997 Jarrow applied Markov chain approach to analyze intensities. The key problem that arises is the selection of appropriate estimators. Within the Markov approach among the most frequently used estimators of a migration matrix are cohort and duration estimators. Migration matrices can also be obtained with help of statistical longitudinal models (GLMM) in which states (rating classes) in discrete time points are regarded as matched pairs. In this paper we compare Markov chain models and GLMM models and the influence of their application on bank portfolio evaluation.
Źródło:
Acta Physica Polonica A; 2012, 121, 2B; B-40-B-46
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical Comparison between the Pulsed Electric Field and Thermal Decontamination Methods of Hospital Wastewater
Autorzy:
Gusbeth, C.
Frey, W.
Schwartz, T.
Rieder, A.
Powiązania:
https://bibliotekanauki.pl/articles/1807927.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.cj
87.14.ej
92.40.kc
Opis:
Filtered wastewater samples were inoculated with Enterococcus faecium and exposed to different pulsed electric field (PEF) treatment energies at 40, 50 and 60°C. A lethal effect of heat treatment on E. faecium can be observed for T > 56°C and a heating duration of 4 min. A treatment with 60°C, 4 min, provokes a bacterial reduction of 4 log. A combined treatment of inoculated wastewater samples with pulsed electric field and heat (40, 50 and 60°C) reduced the bacterial contamination considerably. At a suspension temperature of 60°C pulsed electric field inactivation resulted in a complete bacterial decontamination (8 log reduction rate). Moreover, it was demonstrated that naturally occurring nuclease activities were not changed by the pulsed electric field treatment. In contrast to a thermal treatment with temperature over 72°C, for 4 min., the nuclease activity was reduced up to 90%. In this case, inactivation is only 4 log. The same inactivation rate can be obtained by a combination of heat treatment (60°C) and pulsed electric field treatment (30 J/ml).
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1092-1094
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 51

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