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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:BIBFORM054302
Első szerző:Krasznai Zoárd Tibor (szülész-nőgyógyász, gyermeknőgyógyász)
Cím:18FDG a PET tumor diagnostic tracer is not a substrate of the ABC transporter P-glycoprotein / Zoárd T. Krasznai, György Trencsényi, Zoltán Krasznai, Pál Mikecz, Enikő Nizsalóczki, Gábor Szalóki, Judit P. Szabó, László Balkay, Teréz Márián, Katalin Goda
Dátum:2014
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:European Journal of Pharmaceutical Sciences. - 64C (2014), p. 1-8. -
További szerzők:Trencsényi György (1978-) (biológus, biokémikus, molekuláris biológus) Krasznai Zoltán (1950-) (biofizikus) Mikecz Pál (1956-) (vegyész) Nizsalóczki Enikő Szalóki Gábor (1986-) (molekuláris biológus) Péli-Szabó Judit (1977-) (vegyész) Balkay László (1963-) (biofizikus) Márián Teréz (1950-) (radiobiológus) Goda Katalin (1969-) (biofizikus)
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5.

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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6.

001-es BibID:BIBFORM038939
Első szerző:Krasznai Zoltán (biofizikus)
Cím:Membrane hyperpolarization removes inactivation of Ca2+ channels, leading to Ca2+ influx and subsequent initiation of sperm motility in the common carp / Krasznai, Z., Marian, T., Izumi, H., Damjanovich, S., Balkay, L., Tron, L., Morisawa, M.
Dátum:2000
Megjegyzések:Change of osmolality surrounding spawned sperm from isotonic to hypotonic causes the initiation of sperm motility in the common carp. Here we show that membrane-permeable cAMP does not initiate motility of carp sperm that is quiescent in isotonic solution, and that motility of the demembranated sperm can be reactivated without cAMP. Furthermore, the cAMP level does not change during the initiation of sperm motility, and inhibitors of protein kinase do not affect sperm motility, suggesting that no cAMP-dependent system is necessary for the regulation of sperm motility. Sperm motility could not be initiated in Ca(2+)-free hypoosmotic solutions, and significant increase in the intracellular Ca(2+) level was observed by a Ca-sensitive fluorescence dye during hypoosmolality-induced active motion period. The demembranated sperm cells were fully reactivated in the solutions containing 10(-7) to 10(-5) M Ca(2+). Ca(2+) channel blockers such as verapamil and omega-conotoxin reversibly inhibited the initiation of sperm motility, suggesting that Ca(2+) influx is the prerequisite for the initiation of carp sperm motility. Motility of intact sperm was completely blocked; however, that of the demembranated sperm was not inhibited by the calmodulin inhibitor W7, suggesting that the calmodulin bound close to the plasma membrane participated in the initiation of sperm motility. Flow cytometric membrane potential measurements and spectrophotometric measurements by using fluorescence dyes showed transient membrane hyperpolarization on hypoosmolality-induced motility. This article discusses the role of membrane hyperpolarization on removal of inactivation of Ca(2+) channels, leading to Ca(2+) influx at the initiation of carp sperm motility.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Proceedings of the National Academy of Sciences of the United States of America. - 97 : 5 (2000), p. 2052-2057. -
További szerzők:Márián Teréz (1950-) (radiobiológus) Izumi, Hiroko Damjanovich Sándor (1936-2017) (biofizikus) Balkay László (1963-) (biofizikus) Trón Lajos (1941-) (biofizikus) Morisawa, Masaaki
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7.

001-es BibID:BIBFORM086725
035-os BibID:P325(cikkazonosító)
Első szerző:Márián Teréz (radiobiológus)
Cím:Development and primary evaluation of [11C]ISC a tracer for in vivo mapping adenosine A2A receptors by PET / T. Márián, E. Németh, J. Péli-Szabó, P. Mikecz, J. A. Szentmiklósi, Zs. Bagoly, L. Balkay, L. Trón, Z. Krasznai
Dátum:2005
ISSN:1619-7070 1619-7089
Tárgyszavak:Orvostudományok Klinikai orvostudományok idézhető absztrakt
folyóiratcikk
Megjelenés:European Journal of Nuclear Medicine and Molecular Imaging. - 32 : Suppl1 (2005), p. S187. -
További szerzők:Németh Enikő (1977-) (vegyész) Péli-Szabó Judit (1977-) (vegyész) Mikecz Pál (1956-) (vegyész) Szentmiklósi József András (1948-) (farmakológus, klinikai laboratóriumi szakorvos) Bagoly Zsuzsa (1978-) (orvos) Balkay László (1963-) (biofizikus) Trón Lajos (1941-) (biofizikus) Krasznai Zoltán (1950-) (biofizikus)
Pályázati támogatás:OTKA T-038270
OTKA
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DOI
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8.

001-es BibID:BIBFORM045960
035-os BibID:PMID:12830325
Első szerző:Márián Teréz (radiobiológus)
Cím:In vivo and in vitro multitracer analyses of P-glycoprotein expression-related multidrug resistance / Teréz Márián, Gábor Szabó, Katalin Goda, Henrietta Nagy, Nóra Szincsák, István Juhász, László Galuska, László Balkay, Pál Mikecz, Lajos Trón, Zoltán Krasznai
Dátum:2003
ISSN:1619-7070
Megjegyzések:P-glycoprotein (Pgp) is an ABC (ATP binding cassette) transporter that is often overexpressed in tumours, contributing significantly to their multidrug resistance. In this study, we explored whether the radiotracers used in tumour diagnostics can be used for in vivo visualisation of Pgp-related multidrug resistance. We also examined the effects of different Pgp modulators on the accumulation of these radioligands in tumours with or without Pgp expression. In a SCID BC-17 mouse model, cells of the drug-sensitive KB-3-1 (MDR(-)) and the KB-V1 Pgp-expressing (MDR(+)) human epidermoid carcinoma cell lines were inoculated to yield tumours in opposite flanks. For in vivo scintigraphic (biodistribution) and positron emission tomography (PET) examinations, the mice were injected with technetium-99m hexakis-2-methoxybutylisonitrile ((99m)Tc-MIBI), carbon-11 labelled methionine and fluorine-18 fluoro-2-deoxy- d-glucose ((18)FDG). For validation, in vitro cell studies with (99m)Tc-MIBI,( 99m)Tc-tetrofosmin, [(11)C]methionine and (18)FDG were carried out using a gamma counter. The expression and function of the MDR product were proved by immunohistochemistry and spectrofluorimetry. (99m)Tc-MIBI uptake was significantly lower in KB-V1 cells as compared with KB-3-1-derived tumours in vivo (Pgp(+)/Pgp(-) =0.61+/-0.13; P<0.01) and cells in vitro (Pgp(+)/Pgp(-) =0.08+/-0.01; P<0.001).()Cyclosporin A reversed (99m)Tc-MIBI uptake in the Pgp+ cells, while verapamil failed to modify it. (18)FDG uptake was significantly higher in KB-V1 tumours (Pgp(+)/Pgp(-) =1.36+/-0.05; P<0.01) and cells (Pgp(+)/Pgp(- )=1.52+/-0.12; P<0.001). Whereas cyclosporin A eliminated the difference between FDG uptake in MDR(+) and MDR(-) cell lines, verapamil significantly increased it. When the animals were treated with verapamil, the ratio of (99m)Tc-MIBI uptake in the MDR(+) tumours to that in the MDR(-) tumours decreased to 0.38+/-0.05 ( P<0.01), while the ratio of (18)FDG uptake increased to 2.1+/-0.3 ( P<0.001). There were no significant differences in the [(11)C]methionine uptake in the MDR(+) and MDR(-) tumours and cell lines, nor was [(11)C]methionine accumulation modified by cyclosporin A. Parallel administration of (18)FDG and (99m)Tc-MIBI combined with verapamil treatment seems to be a good candidate as a non-invasive marker for the diagnosis of MDR-related Pgp expression in tumours.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:European Journal of Nuclear Medicine and Molecular Imaging 30 : 8 (2003), p. 1147-1154. -
További szerzők:Szabó Gábor (1953-) (biofizikus) Goda Katalin (1969-) (biofizikus) Nagy Henrietta Szincsák Nóra Juhász István (1956-) (bőrgyógyász, bőrsebész, kozmetológus, klinikai onkológus) Galuska László (1946-) (belgyógyász, izotópdiagnoszta) Balkay László (1963-) (biofizikus) Mikecz Pál (1956-) (vegyész) Trón Lajos (1941-) (biofizikus) Krasznai Zoltán (1950-) (biofizikus)
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9.

001-es BibID:BIBFORM039513
Első szerző:Márián Teréz (radiobiológus)
Cím:A1 and A2 adenosine receptor activation inversely modulates potassium currents and membrane potential in DDT1 MF-2 smooth muscle cells / Marian, T., Rubovszky, B., Szentmiklosi, A. J., Tron, L., Balkay, L., Boros, I., Gaspar, R., Szekely, A., Krasznai, Z.
Dátum:2002
ISSN:0021-5198
Megjegyzések:Adenosine receptors are widely distributed in mammalian tissues and have been possibly involved through transmembrane potential changes in cell function regulation. The effect of A1 and A2A adenosine receptor ligands on transmembrane potential measured with flow cytometry and potassium conductance measured by the patch-clamp technique was investigated in DDT1 MF-2 smooth muscle cells. The A1 adenosine-receptor agonist CPA (50 nM) and the A2A adenosine-receptor agonist CGS 21680 (50 nM) elicited a rapid and maintained increase and decrease in the potassium conductance, respectively, and a concomitant hyperpolarization and depolarization of the membrane, respectively. These effects were eliminated by subtype-selective adenosine receptor antagonists (DPCPX, CSC, ZM 241385, all 1 microM). The ligand induced membrane potential changes were reversible. Based on these detected membrane potential changes along with the published voltage dependence of the adenylyl cyclase, the regulation of cAMP production by A1- and A2A-receptor activation is suggested to be mediated through the induced early hyperpolarization and depolarization. The interaction between the effects of these receptor subtypes allows for a complex regulation mechanism.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:The Japanese Journal of Pharmacology. - 89 : 4 (2002), p. 366-372. -
További szerzők:Rubovszky Bálint (1975-) (élettanász) Szentmiklósi József András (1948-) (farmakológus, klinikai laboratóriumi szakorvos) Trón Lajos (1941-) (biofizikus) Balkay László (1963-) (biofizikus) Boros István Gáspár Rezső (1944-) (biofizikus) Székely Andrea Krasznai Zoltán (1950-) (biofizikus)
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10.

001-es BibID:BIBFORM029944
Első szerző:Márián Teréz (radiobiológus)
Cím:Hypoglycemia activates compensatory mechanism of glucose metabolism of brain / Marian, T., Balkay, L., Fekete, I., Lengyel, Z., Veress, G., Esik, O., Tron, L., Krasznai, Z.
Dátum:2001
ISSN:0236-5383
Megjegyzések:The effect of plasma glucose concentration on the cerebral uptake of [18F]-fluorodeoxy-D-glucose (FDG) was studied in a broad concentration range in a rabbit brain model using dynamic FDG PET measurements. Hypoglycemic and hyperglycemic conditions were maintained by manipulating plasma glucose applying i.v. glucose or insulin load. FDG utilization (K) and cerebral glucose metabolic rate (CGMR) were evaluated in a plasma glucose concentration range between 0.5 mM and 26 mM from the kinetic constant k1, k2, k3 obtained by the Sokoloff model of FDG accumulation. A decreasing set of standard FDG uptake values found with increasing blood glucose concentration was explained by competition between the plasma glucose and the radiopharmacon FDG. A similar trend was observed for the forward kinetic constants k1, and k3 in the entire concentration range studied. The same decreasing tendency of k2 was of a smaller magnitude and was reverted at the lowest glucose concentrations where a pronounced decrease of this backward transport rate constant was detected. Our kinetic data indicate a modulation of the kinetics of carbohydrate metabolism by the blood glucose concentration and report on a special mechanism compensating for the low glucose supply under conditions of extremely low blood glucose level.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény hazai lapban
Megjelenés:Acta Biologica Hungarica. - 52 : 1 (2001), p. 35-45. -
További szerzők:Balkay László (1963-) (biofizikus) Fekete István (1951-) (neurológus, pszichiáter) Lengyel Zsolt (nukleáris medicina szakorvos) Veress Gábor (1971-) (neurobiológus) Ésik Olga Trón Lajos (1941-) (biofizikus) Krasznai Zoltán (1950-) (biofizikus)
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11.

001-es BibID:BIBFORM004875
Első szerző:Márián Teréz (radiobiológus)
Cím:Effects of miltefosine on membrane permeability and accumulation of [99mTc]-hexakis-2-methoxyisobutyl isonitrile, 2-[18F]fluoro-2-deoxy-D-glucose, daunorubucin and rhodamine123 in multidrug-resistant and sensitive cells / Marian, T., Balkay, L., Tron, L., Krasznai, Z. T., Szabo-Peli, J., Krasznai, Z.
Dátum:2005
ISSN:0928-0987
Megjegyzések:Miltefosine is a phospholipid analog that exhibits antineoplastic activity against breast cancer metastases, but its mechanism of action remains uncertain. The aim of this study was to investigate the transport mechanism for the removal of miltefosine and [99mTc]-hexakis-2-methoxyisobutyl isonitrile (99mTc-MIBI) from multidrug-resistant cells. The P-glycoprotein pump function, cell viability, and 99mTc-MIBI and 2-[18F]fluoro-2-deoxy-D-glucose (18FDG) uptakes were measured in NIH 3T3 (3T3) and NIH 3T3MDR1 G185 (3T3MDR1) mouse fibroblasts and human lymphoid B JY cells. Miltefosine treatment increased the permeability and fluidity of these tumor cells in a concentration-dependent manner. The multidrug-sensitive cells were 3-4 times more sensitive to miltefosine than the multidrug-resistant ones. The extent of 99mTc-MIBI accumulation in the P-glycoprotein-expressing cells increased in the presence of miltefosine, whereas the rhodamine123 and daunorubicin uptakes of the cells did not change significantly. In the 3T3MDR1 cells verapamil reinstated the rhodamine123 and daunorubicin accumulation, but not the 99mTc-MIBI uptake. Cyclosporin A reinstated the uptakes of 99mTc-MIBI, daunorubicin and rhodamine123 by the 3T3MDR1 cells. In a concentration-dependent manner miltefosine decreased the extents of 99mTc-MIBI, rhodamine123, daunorubicin and 18FDG accumulation in the JY and 3T3 cells. Our findings indicate a common transport mechanism for 99mTc-MIBI and miltefosine, which is distinct from that for rhodamine123 and daunorubicin in MDR cells
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
3T3 Cells
analogs & derivatives
analysis
Animals
Cell Membrane Permeability
Cells
Daunorubicin
drug effects
Drug Resistance,Multiple
Fibroblasts
Fluorodeoxyglucose F18
Human
Humans
Hungary
Membrane Fluidity
Mice
Nih 3T3 Cells
P-Glycoprotein
Permeability
pharmacokinetics
pharmacology
Phosphorylcholine
Research
Rhodamine 123
Support
Technetium Tc 99m Sestamibi
Verapamil
Megjelenés:European Journal of Pharmaceutical Sciences. - 24 : 5 (2005), p. 495-501. -
További szerzők:Balkay László (1963-) (biofizikus) Trón Lajos (1941-) (biofizikus) Krasznai Zoárd Tibor (1973-) (szülész-nőgyógyász, gyermeknőgyógyász) Szabó-Péli Judit (1977-) (kutató) Krasznai Zoltán (1950-) (biofizikus)
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12.

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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