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1.

001-es BibID:BIBFORM004938
Első szerző:Balkay László (biofizikus)
Cím:Flow cytometric determination of intracellular free potassium concentration / Balkay, L., Marian, T., Emri, M., Krasznai, Z., Tron, L.
Dátum:1997
ISSN:0196-4763
Megjegyzések:A flow cytometric assay has been developed for determination of intracellular free potassium concentration ([K+]i). Investigated cells, loaded with the fluorescent pH indicator 2',7bis-(2-carboxyethyl)-5(and-6)-carboxyfluorescein (BCECF), are incubated in the presence of nigericin, and the intracellular pH is measured. The ionophore maintains the same ratio value [H+]/[K+] on both sides of the cytoplasmic membrane, so [K+]i can be evaluated from the measured intracellular pH (pHi) and the known parameters of the buffer. Application of the method revealed that the intracellular potassium concentration is significantly higher in lymphocytes than in proliferating cells of HUT-78, U266, and JY cell lines. A surprisingly low (60 mM) [K+]i concentration was observed with sperm cells of common carp. This method allows measurements on individual cells, provides data of excellent statistics, and still does not require large amounts of material. These features offer remarkable advantages over other techniques used for intracellular K+ measurements, such as steady-state fluorescence, atom absorption photometry, or energy-dispersive x-ray analysis.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
analysis
Animal
Biophysics
Buffers
Cell Line
Cells
diagnostic use
Dyes
Flow Cytometry
Fluorescein
Fluoresceins
Fluorescence
Fluorescent Dyes
Human
Hungary
Hydrogen-Ion Concentration
Ionophores
Lymphocytes
metabolism
Mice
Nigericin
Potassium
Rats
Megjelenés:Cytometry. - 28 : 1 (1997), p. 42-49. -
További szerzők:Márián Teréz (1950-) (radiobiológus) Emri Miklós (1962-) (fizikus) Krasznai Zoltán (1950-) (biofizikus) Trón Lajos (1941-) (biofizikus)
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2.

001-es BibID:BIBFORM031868
Első szerző:Emri Miklós (fizikus)
Cím:Temperature adaptation changes ion concentrations in spermatozoa and seminal plasma of common carp without affecting sperm motility / M. Emri, T. Márián, L. Trón, L. Balkay, Z. Krasznai
Dátum:1998
ISSN:0044-8486
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Aquaculture. - 167 : 1-2 (1998), p. 85-94. -
További szerzők:Márián Teréz (1950-) (radiobiológus) Trón Lajos (1941-) (biofizikus) Balkay László (1963-) (biofizikus) Krasznai Zoltán (1950-) (biofizikus)
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3.

001-es BibID:BIBFORM031867
Első szerző:Emri Miklós (fizikus)
Cím:Wide applicability of a flow cytometric assay to measure absolute membrane potentials on the millivolt scale / Miklós Emri, László Balkay, Zoltán Krasznai, Lajos Trón, Teréz Márián
Dátum:1998
ISSN:0175-7571
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:European Biophysics Journal With Biophysics Letters. - 28 : 1 (1998), p. 78-83. -
További szerzők:Balkay László (1963-) (biofizikus) Krasznai Zoltán (1950-) (biofizikus) Trón Lajos (1941-) (biofizikus) Márián Teréz (1950-) (radiobiológus)
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4.

001-es BibID:BIBFORM046276
Első szerző:Krasznai Zoltán (biofizikus)
Cím:Flow cytometric determination of absolute membrane potential of cells / Krasznai Z., Marian T., Balkay L., Emri M., Tron L.
Dátum:1995
Megjegyzések:Membrane potential measurements using fluorescent membrane potential indicator dyes report on relative changes but usually do not result in an absolute value of the measured parameter. The method developed in this paper is based on the assumption that the negatively charged bis-oxonol distributes across the cytoplasmic membrane according to the Nernst equation. It is further supposed that the fluorescence intensity measured from a given stained cell is a single-value function of the intracellular dye concentration. The protocol suggested incorporates the construction of a calibration curve (fluorescence intensity measured from stained cells vs. extracellular dye concentration). This allows the evaluation of the membrane potential in millivolts using fluorescence readings of the cells both in the depolarized state and in the state of interest. Good agreement was found between absolute membrane potential data of human peripheral blood lymphocytes by our method and results of parallel patch clamp measurements.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal of Photochemistry and Photobiology. B, Biology. - 28 : 1 (1995), p. 93-99. -
További szerzők:Márián Teréz (1950-) (radiobiológus) Balkay László (1963-) (biofizikus) Emri Miklós (1962-) (fizikus) Trón Lajos (1941-) (biofizikus)
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5.

001-es BibID:BIBFORM004948
Első szerző:Márián Teréz (radiobiológus)
Cím:Role of extracellular and intracellular pH in carp sperm motility and modifications by hyperosmosis of regulation of the Na+/H+ exchanger / Marian, T., Krasznai, Z., Balkay, L., Emri, M., Tron, L.
Dátum:1997
ISSN:0196-4763
Megjegyzések:Recently developed flow cytometric methods (Tron et al.: Mol Immunol 27:1307-1311, 1990) to measure the intracellular pH (pHi) and intracellular potassium concentration in mammalian cells by using the fluorescent pH-indicator dye 2',7bis-(2-carboxyethyl)-5 (and-6)-carboxyfluorescein (BCECF) were adopted for measuring these parameters in carp sperm. The intracellular potassium concentration of the carp sperm was 62.4 +/- 5.3 mM. This is very similar to the potassium concentration of the seminal plasma (87 +/- 16 mM), and it suggests a depolarized state of the sperm cell in the semen. An average pHi value of 7.06 +/- 0.11 was obtained by measuring sperm samples taken from ten animals. Changes in the ionic composition of the environment did not alter pHi. Sperm motility was initiated by transferring the cells to an environment of 110 mOsm osmolality. This hypoosmotic shock induced fast changes in the membrane structure that could be reversed by restoring physiologic osmolality. Activation was accompanied by a fast alkalinization of the sperm cells. This pH change was amiloride sensitive, suggesting the involvement of the Na+/H+ exchanger in the activation process. Alkalinization of acid-loaded sperm cells depended on the osmolality of the environment. Equilibrium pHi of these cells in hyperosmotic buffers was substantially lower relative to cells in an isoosmotic environment. Effects of the extracellular and intracellular pH on carp sperm motility were also examined. Extracellular pH below 5.5 abolished sperm motility completely. Alkaline extracellular pH did not alter the duration of sperm motility even at extreme values (pHe = 9.6). Duration of the flagellar motion did not depend on the pHi between values of 6.5 and 8.5; however, it was significantly reduced both below and above this range. No motility was observed below pHi = 6.0 or above pHi = 9.5 with a 10 min incubation time at these pH values prior to activation. Effects of the extracellular and intracellular pH on sperm motility were partially reversible.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Amiloride
Animal
Buffers
Carps
Cell Membrane Permeability
Cells
chemistry
cytology
Dyes
Extracellular Space
Flow Cytometry
Fluorescein
Fluoresceins
Fluorescent Dyes
Hungary
Hydrogen-Ion Concentration
Intracellular Fluid
Light
Male
methods
Motion
Osmolar Concentration
physiology
Potassium
Scattering,Radiation
Semen
Sodium-Hydrogen Antiporter
Sperm Motility
Spermatozoa
Support,Non-U.S.Gov't
egyetemen (Magyarországon) készült közlemény
Megjelenés:Cytometry. - 27 : 4 (1997), p. 374-382. -
További szerzők:Krasznai Zoltán (1950-) (biofizikus) Balkay László (1963-) (biofizikus) Emri Miklós (1962-) (fizikus) Trón Lajos (1941-) (biofizikus)
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6.

001-es BibID:BIBFORM006042
035-os BibID:PMID:8419464
Első szerző:Márián Teréz (radiobiológus)
Cím:Hypo-osmotic shock induces an osmolality-dependent permeabilization and structural changes in the membrane of carp sperm / Teréz Márián, Zoltán Krasznai, László Balkay, Margit Balázs, Miklós Emri, László Bene, Lajos Trón
Dátum:1993
Megjegyzések:We carried out spectrofluorimetric and flow cytometric measurements to investigate the effect of hypo-osmotic shock on cell membranes of common carp sperm. The time course of the permeability of the sperm cell membrane, as monitored by DNA-related propidium iodide (PI) fluorescence, was followed for 30 min after dilution of semen in hypo-osmotic environments of different ionic strengths. Spectrofluorimetric measurements indicated a continuous increase in the total PI emission intensity of a sperm suspension. Cell-by-cell flow cytometric measurements suggested that the permeability changes were of the all-or-none type. The permeabilized fraction of cells in the individual samples was time and osmolality dependent. The number and percentage of cells in which DNA was stained by PI increased gradually over time and reached a steady-state plateau value after 5-15 min. This equilibrium fraction of cells with a PI-permeable cytoplasmic membrane displayed an inverse relationship with the osmolality of the diluent, having a near 100% value for fresh water and distilled water. Dilution of sperm in hypo-osmotic medium brought about a fast decrease in the forward light-scattering signal on a short time scale compared to the pre-steady-state time of the permeabilization. With the addition of extracellular Ca2+ (1.8 mM), restoration of the light scattering signal was observed. Permeabilization of the membrane and restoration of light scattering were not coincident in time. We propose a two-dimensional reorganization of the lipid structure as the underlying mechanism of the latter process.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Animal
Calcium
Calcium Chloride
Carps
Cell Membrane
Cell Membrane Permeability
Cells
Dna
drug effects
Flow Cytometry
Fluorescence
Hungary
Light
Male
Osmolar Concentration
Osmotic Pressure
pharmacology
physiology
Propidium
Semen
Spectrometry,Fluorescence
Spermatozoa
Support,Non-U.S.Gov't
ultrastructure
Water
egyetemen (Magyarországon) készült közlemény
Megjelenés:The Journal of Histochemistry and Cytochemistry. - 41 : 2 (1993), p. 291-297. -
További szerzők:Krasznai Zoltán (1950-) (biofizikus) Balkay László (1963-) (biofizikus) Balázs Margit (1952-) (sejtbiológus, molekuláris genetikus) Emri Miklós (1962-) (fizikus) Bene László (1963-) (biofizikus) Trón Lajos (1941-) (biofizikus)
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7.

001-es BibID:BIBFORM054699
035-os BibID:Article ID: 787365
Első szerző:Trencsényi György (biológus, biokémikus, molekuláris biológus)
Cím:18FDG, [18F]FLT, [18F]FAZA and 11C-methionine are suitable tracers for the diagnosis and in vivo follow up the efficacy of chemotherapy by miniPET both in multidrug resistant and sensitive human gynecologic tumor xenografts / György Trencsényi, Teréz Márián, Imre Lajtos, Zoltán Krasznai, László Balkay, Miklós Emri, Pál Mikecz, Katalin Goda, Gábor Szalóki, István Juhász, Enikő Németh, Tünde Miklovicz, Gábor Szabó, Zoárd T. Krasznai
Dátum:2014
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:BioMed Research International 2014 (2014), p. 1-10. -
További szerzők:Márián Teréz (1950-) (radiobiológus) Lajtos Imre (1986-) (fizikus) Krasznai Zoltán (1950-) (biofizikus) Balkay László (1963-) (biofizikus) Emri Miklós (1962-) (fizikus) Mikecz Pál (1956-) (vegyész) Goda Katalin (1969-) (biofizikus) Szalóki Gábor (1986-) (molekuláris biológus) Juhász István (1956-) (bőrgyógyász, bőrsebész, kozmetológus, klinikai onkológus) Németh Enikő (1977-) (vegyész) Miklovicz Tünde (1972-) (vegyész) Szabó Gábor (1953-) (biofizikus) Krasznai Zoárd Tibor (1973-) (szülész-nőgyógyász, gyermeknőgyógyász)
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