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Wyszukujesz frazę "87.64.M-" wg kryterium: Wszystkie pola


Tytuł:
Implementation of NSOM to Biological Samples
Autorzy:
Prauzner-Bechcicki, S.
Wiltowska-Zuber, J.
Budkowski, A.
Lekka, M.
Rysz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1490227.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.M-
87.64.mt
Opis:
Near-field scanning optical microscopy is a technique providing images of structures with spatial resolution better than λ/2, which is undetectable in far-field where the Abbe law of limiting resolution is critical. In parallel to the optical imaging, topography maps are also acquired. Near-field scanning optical microscopy measurements can be performed both in air and liquid environments. The later makes the technique very useful for biomaterials analysis offering information that could not be obtained with other methods. Our work presents the results of recent studies on application of near-field scanning optical microscopy to imaging of cells in air as well as in physiological buffers. Differences in cell's topography and morphology have been noticed between two cell lines from human bladder non-malignant (HCV29) and malignant (T24) cancers. Presented results are part of the research that characterizes physiological changes of cells depending on stage of cancer.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 533-538
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Mechanical Properties of Fe-Based Metal Matrix Composites by Warm Compaction for Gear Production
Autorzy:
Gun, T.
Simsir, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032024.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.ev
87.15.La
87.64.M
Opis:
In this study, mechanical behavior of iron-based (Fe-0.8C-2.0Cu-4.5Ni-1.8Mo-1.0B (wt.%)) metal matrix composite synthesized by powder metallurgy was investigated for gear production. Metal matrix composite has been produced by warm compaction, followed by free sintering in controlled Ar gas atmosphere. Green composite was produced under pressure of 650 MPa at 160°C. The green products have been sintered at various temperatures (1050, 1150 and 1250°C) and for various time periods (30, 60 and 90 min). Mechanical tests (hardness and wear tests) have been conducted. The microstructure and the worn surfaces of the samples have been examined under scanning electron microscope and analyzed by energy dispersive spectroscopy and X-ray diffraction method. The results have shown that hardness and wear resistance of the samples increase with increasing sintering temperature and time. Effect of sintering temperature is greater than that of sintering time. The highest hardness and wear resistance have been obtained in the composite sample produced at 1250°C for 90 min.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 443-447
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Distribution of Biological Particles Suspended in Normal Cerebrospinal Fluid (CSF)
Autorzy:
Staroń, W.
Herbowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/1537551.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.M-
02.50.-r
61.20.-p
Opis:
Cerebrospinal fluid's functions are protecting, expelling and transporting which are influenced by properties of the fluid. Disorder of one of the functions may bring a disease. Cerebrospinal fluid mainly consists of water (99%), cells and proteins suspended in it. Due to the suspension it can be considered as dispersion medium. Every dispersion medium is characterized by the parameters of particles suspended in it. Parameters of dispersion medium may be classified as single or cumulative parameters. Hence, there is possible to determine additional parameters which characterize CSF in order to give full description of the fluid. The authors present results of research on suspension in normal cerebrospinal fluid worked out on the basis of 2500 microscoping pictures and they also give a statistical analysis of particle diameters. The paper is a part of research project on "Physico-chemical processes in cerebrospinal fluid obtained by puncture from patients diagnosed with the disorders of cerebrospinal fluid (CSF) circulation" realized by Institute of Physics, University of Szczecin in co-operation with Neurosurgery Ward of Public Provincial Hospital Complex in Szczecin.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 159-160
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasmon Enhancement of Fluorescence in Single Light-Harvesting Complexes from em Amphidinium carterae
Autorzy:
Bujak, Ł.
Piątkowski, D.
Mackowski, S.
Wörmke, S.
Jung, C.
Bräuchle, C.
Agarwal, A.
Kotov, N.
Schulte, T.
Hofmann, E.
Brotosudarmo, T.
Scheer, H.
Govorov, A.
Hiller, R.
Powiązania:
https://bibliotekanauki.pl/articles/1807594.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.80.Nj
87.14.E-
87.64.M-
Opis:
We show that single peridinin-chlorophyll a-protein light-harvesting complexes from dinoflagellate Amphidinium carterae placed near to silver nanoparticles show strongly enhanced fluorescence emission. Single molecule spectroscopy experiments performed at room temperature point toward an enhancement of more than an order of magnitude for optimal conditions. Irrespective of the enhancement, we observe no effect of the metal nanoparticle on the fluorescence emission energy of the complex. This result provides a way to control the optical properties of biomolecules via plasmon excitations in metal nanoparticles.
Źródło:
Acta Physica Polonica A; 2009, 116, S; S-22-S-25
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary Analysis of Size Distribution of Objects Suspended in Normal Cerebrospinal Fluid in Case of Venticular Hydrocephalic Enlargement and Internal Hydrocephalus
Autorzy:
Staroń, W.
Kubisz, L.
Herbowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/1490409.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.M-
02.50.-r
61.20.-p
Opis:
The paper presents preliminary analysis of normal non-coloured cerebrospinal fluid obtained from patients diagnosed due to suspicion of cerebrospinal fluid malabsorption. According to the findings, the normal cerebrospinal fluid was classified into two groups: A - with clinical diagnosis of ventricular hydrocephalic enlargement and B - with clinical diagnosis of internal hydrocephalus. The analysis of microscopic pictures of normal cerebrospinal fluid in both groups according to numbers and sizes of suspended objects was performed with the aid of Eclipse 600 microscope (with magnification of 1200×) working with a computer by a digital video camera. The authors observed that there is a significant difference in a shape of the distribution curve of objects' diameters between groups A and B. The maximum number of objects in group A was recorded within the range from 5 to 10 μm in diameter size whereas in group B the maximum was recorded within the range from 0.5 to 5 μm in diameter size.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-046-A-048
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescence Mapping of PCP Light-Harvesting Complexes Coupled to Silver Nanowires
Autorzy:
Krajnik, B.
Piatkowski, D.
Olejnik, M.
Czechowski, N.
Hofmann, E.
Heiss, W.
Mackowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1419489.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.kv
42.62.Fi
81.07.Pr
87.64.M-
Opis:
In this work we demonstrate confocal fluorescence imaging of hybrid nanostructures composed of silver nanowires and peridinin-chlorophyll-protein light-harvesting complexes. The length of silver nanowires, which reaches 10 μm, allows for determination of the nanowire position and consequently direct correlation with the fluorescence image. In this way we probe the influence of plasmon induced electromagnetic field on the fluorescence of light-harvesting complexes. When the nanowires are spaced from the light-harvesting complexes by a 10 nm thick dielectric layer, we observe a fluorescence enhancement, which depends upon the laser excitation wavelength. The measured enhancement values are 2.5 and 1.9 for 405 nm and 485 nm, respectively. Larger enhancement for the 405 nm excitation is attributed to direct creation of plasmon excitations in the silver nanowires.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 259-262
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Realization of a Phase Noise Measurement Bench Using Cross Correlation and Double Optical Delay Line
Autorzy:
Salzenstein, P.
Cussey, J.
Jouvenceau, X.
Tavernier, H.
Larger, L.
Rubiola, E.
Sauvage, G.
Powiązania:
https://bibliotekanauki.pl/articles/2047892.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
06.30.Ft
43.50.Yw
87.64.M-
87.57.cm
Opis:
In this paper there are presented first results obtained with a phase noise measurement bench operating in X-band, realized in our laboratory, using double optical delay line and cross correlation. Phase noise floor using a microwave sapphire oscillator is better than -160 dB rad$\text{}^{2}$/Hz at 10 kHz from the 10 GHz carrier, using a 2 km optical delay line.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1107-1111
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Mini-Disk Resonator Integrated into a Compact Optoelectronic Oscillator
Autorzy:
Salzenstein, P.
Tavernier, H.
Volyanskiy, K.
Kim, N.
Larger, L.
Rubiola, E.
Powiązania:
https://bibliotekanauki.pl/articles/1795637.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
06.30.Ft
43.50.Yw
87.64.M-
87.57.cm
Opis:
This work consists in the design, fabrication and characterization of mini-disk $MgF_{2}$ resonators for integration into optoelectronic oscillator and first experimental results of implementation in microwave free spectral range oscillator with taper coupling optoelectronic oscillator.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 661-663
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of μ-FTIR-SR Spectroscopy to Prostate Tissue Analysis
Autorzy:
Kwiatek, W.
Paluszkiewicz, C.
Banaś, A.
Kisiel, A.
Podgórczyk, M.
Marcelli, A.
Cestelli Guidi, M.
Piccinini, M.
Powiązania:
https://bibliotekanauki.pl/articles/1810277.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.km
87.64.kp
87.64.Ee
87.85.jf
Opis:
The infrared spectromicroscopy is a quite recent technique rapidly developing thanks to the availability of new instruments and new brilliant synchrotron radiation sources in different areas and in particular to biomedical researches. In order to achieve a diffraction limited spatial resolution in tissue samples, we performed experiments at SINBAD, the synchrotron infrared beamline of the Laboratori Nazionali di Frascati. We characterized the chemical composition of prostate tissue samples taken from patients affected by prostate cancer disease. Different sizes of the pinholes were considered for the measurements. In the case of prostate tissue sections the results show the possibility to determine the intensity ratio of the $CH_2$ and $CH_3$ bands set at 2930 $cm^{-1}$ and 2960 $cm^{-1}$, respectively. Experiments were also performed with a pinhole of 5 μm of diameter and the differences in both histological and chemical compositions of such samples were determined.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 602-605
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Study of Selected Biomaterials Using Vibrational Spectroscopy
Autorzy:
Paluszkiewicz, C.
Kwiatek, W.
Długoń, E.
Wesełucha-Birczyńska, A.
Piccinini, M.
Powiązania:
https://bibliotekanauki.pl/articles/1809387.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.km
87.64.kp
87.64.Ee
87.85.jf
Opis:
Vibrational spectroscopy has been extensively used for in vitro and in vivo investigations of degradation mechanism and kinetics of different biomedical materials as well as it has been used to characterize the crystalline and amorphous domains in bio-mineralization process. Infrared and Raman spectroscopy methods are valuable tools in the biomaterials engineering allowing to study processes occurring during their preparation. In vitro tests, where the materials are immersed in simulated body fluids and/or artificial saliva, were used to evaluate the biocompatibility of biomaterials. This kind of tests are a wide range of repeatable and reproducible methods, which are regulated by international standards for commercial use and scientific development of new materials and products. The aim of this work was to examine phase composition of materials applied in dentistry. The bioactivity of such biomaterials was studied by immersing the samples in synthetic body fluid and artificial saliva. The changes were determined by the Fourier transform infrared and Raman microspectroscopy as well as scanning electron microscopy. It was found that results obtained by vibrational spectroscopy show the differences between the studied samples. Chemical reactions occurring during incubation of cements in artificial saliva as well as in synthetic body fluid result in formation of phosphates which deposit on the cement surface.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 533-536
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Human Lenses by Raman Microspectroscopy
Autorzy:
Paluszkiewicz, C.
Chaniecki, P.
Rękas, M.
Rajchel, B.
Piergies, N.
Kwiatek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1398828.pdf
Data publikacji:
2016-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.kp
42.55.Ye
87.64.-t
Opis:
A cataract is an opacity (clouding) of the normally clear lens which develops as a result of aging, metabolic disorders, trauma or heredity. The number of patients with cataract is increasing exponentially. This disease requires surgical intervention, to remove the cloudy lens and to introduce the eye lens polymer. In this work we will present analyses of degraded parts of human lens. Experimental materials were obtained from the lens removed during surgical intervention. These biological samples were measured using Almega XR Confocal Raman spectrometer (Thermo Scientific) with an excitation source of 785 nm laser line. The Raman vibrations in the spectral region of 650-1750 cm¯¹ were analyzed. The difference spectra revealed an excess of tryptophan, tyrosine, phenylalanine, β-sheet conformation, and molecules or molecular groups.
Źródło:
Acta Physica Polonica A; 2016, 129, 2; 244-246
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the Protein-Binding Properties of Camptothecins by Means of Optical Spectroscopy Methods
Autorzy:
Ziomkowska, B.
Cyrankiewicz, M.
Wybranowski, T.
Kruszewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1197530.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.K-
87.64.kv
87.15.kp
02.50.Sk
Opis:
Optical spectroscopy methods are widely used in studies of drugs. The affinity of camptothecins - anticancer agents - to human serum albumin (HSA) was determined in this work. Camptothecins (CPTs) exist in two forms: active lactone and open ring inactive carboxylate. In blood, the hydrolysis process of lactone form occurs which leads to deactivation of CPTs. Research is being done on biophysical properties of synthesized CPT compounds, in particular on binding to albumin. The affinity to plasma proteins is an important determinant of stability of CPTs in blood. The following analogues of CPT were tested in this paper: irinotecan, SN-38, topotecan, and 9-amino camptothecin. Using the method of fluorescence anisotropy measurement, the association constants of the studied compounds to HSA were determined. The authors attempted to determine the deactivation rate of topotecan in HSA solution using Principal Component Analysis and Factor Analysis of absorption spectra recorded during hydrolysis process of lactone form.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-61-A-65
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controlling Structural and Functional Features of Photosynthetic Antenna
Autorzy:
Fiedor, L.
Fiedor, J.
Pilch, M.
Susz, A.
Tworzydło, J.
Michalik, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419488.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.15.nr
87.15.Cc
87.64.ks
Opis:
In order to gain control over the assembly and functioning of photosynthetic antenna, we have developed methods to manipulate pigment composition of bacterial LH1 complexes via their reconstitution with modified bacteriochlorophylls or carotenoids, major photoactive cofactors of these antennae. In the present work we show how the reconstitution and pigment exchange approach is applied to control structural and functional parameters of LH1 and its subunits. The size of the subunits and the energy of the first excited singlet state can be controlled via the use of detergent while the thermodynamics of LH1 formation can be modified using carotenoids and/or a co-solvent. Carotenoids affect the efficiency of the intracomplex energy transfer, while the replacement of native bacteriochlorophyll a with its Ni-substituted analog allows one to control the excited state properties of LH1. These results show that LH1 is a very promising model system applicable for the design of bio-inspired device performing solar energy conversion.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 255-258
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
⁵⁷Fe Hyperfine Parameters in Vitamins and Dietary Supplements
Autorzy:
Kądziołka-Gaweł, M.
Michałowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1388082.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.kx
Opis:
Mössbauer (nuclear gamma-resonance) spectroscopy was used to study various industrial samples of vitamins and dietary supplements containing iron ions, which are used in the anemia treatment. Determination of the iron state (Fe²⁺ or Fe³⁺) in medicaments is important for the pharmaceuticals evaluation quality. The investigated samples contain ferrous fumarate, ferrous gluconiate and ferric diphosphate. ⁵⁷Fe hyperfine parameters of the studied pharmaceuticals indicate that there exist major iron ferrous and ferric compounds. However, Mossbauer spectra of the investigated samples demonstrated the presence of additional ferrous and ferric components, probably related to impurities or to a partially modified main component.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 653-655
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ESR Studies of Paramagnetic Centers in Pharmaceutical Materials - Cefaclor and Clarithromycin as an Example
Autorzy:
Skowronska, A.
Wojciechowski, M.
Ramos, P.
Pilawa, B.
Kruk, D.
Powiązania:
https://bibliotekanauki.pl/articles/1490205.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.15.La
87.64.kj
87.64.kh
75.10.Dg
Opis:
Electron spin resonance (ESR) studies of two antibiotics, Cefaclor and Clarithromycin, have been performed in order to investigate concentration and dynamics of free radicals generated in these compounds due to thermal sterilization. For Cefaclor three combinations of temperature and heating time have been applied: 160°C, 170°C, 180°C for 120 min, 60 min, and 30 min, respectively, according to the pharmaceutical sterilization norm. Clarithromycin has been heated at 160°C for 120 min. The ESR lineshape has been investigated versus microwave power ranging from 2.2 mW to 70 mW. Electron spin-spin relaxation time has been estimated from the ESR lineshape analysis. Concentrations of radicals generated due to different sterilization procedures have been compared with the purpose to select the best sterilization scheme.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 514-517
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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