Search Results

You are looking at 21 - 24 of 24 items for

  • Author or Editor: J. Mészáros x
  • Refine by Access: All Content x
Clear All Modify Search
Acta Alimentaria
Authors:
Y. Hassan
,
L. Mészáros
,
A. Simon
,
E. Tuboly
,
Cs. Mohácsi-Farkas
, and
J. Farkas

The total viable cell count of bacteria in vacuum-packaged chilled minced beef has been decreased equally, by approx. two log-cycles, as an effect of 1.5-2.0 kGy gamma radiation or 200-300 MPa high hydrostatic pressure (UHP) treatment for 20 min. Coliform bacteria could be eliminated to non-detectable levels by the same treatments. The shelf-life of both untreated and non-thermally pasteurised samples were limited mainly by growth of lactic acid bacteria. At about equal bactericidal effect, more drastic changes of texture and colour occurred in UHP-pasteurized minced beef samples than in the radiation-pasteurized ones. Whereas radiation pasteurisation caused minimal changes in appearance, texture and DSC-thermograms of minced beef, UHP-pasteurisation of the raw samples proved to be strongly discolouring by denaturing the muscle pigments and causing extensive denaturation of the myofibrillar proteins. The water holding capacity of irradiated samples decreased, while that of high pressure treated ones increased as compared to the untreated control. Near infrared spectrometry and electronic nose measurements gave promising results to make distinctions non-destructively on changes of various physical-chemical changes and quality parameters as a function of pasteurising treatments and/or storage.

Restricted access
Journal of Radioanalytical and Nuclear Chemistry
Authors:
Z. Németh
,
Z. Homonnay
,
F. Árva
,
Z. Klencsár
,
E. Kuzmann
,
J. Hakl
,
K. Vad
,
S. Mészáros
,
K. Kellner
,
G. Gritzner
, and
A. Vértes

Abstract  

In this paper we present 57Co emission Mössbauer and AC magnetic susceptibility studies of La0.8Sr0.2CoO3-δ perovskite. The observed coexistence of paramagnetic and magnetic subspectra in the 57Co emission Mössbauer spectra, as well as the difference of their isomer shifts support the existence of electronic phase separation in this perovskite, in good agreement with the double exchange based cluster model.

Restricted access
Acta Physiologica Hungarica
Authors:
Krisztina Rusai
,
A. Prokai
,
C. Juanxing
,
K. Meszaros
,
B. Szalay
,
K. Pásti
,
V. Müller
,
U. Heemann
,
J. Lutz
,
T. Tulassay
, and
A. Szabo

Previous experimental data suggest that steroids might have protective effects during hypoxic/ischemic injury of various organs. In this study, the association between dexamethason (Dexa) treatment and the anti-apoptotic SGK-1 was tested in ischemic renal injury. In vitro, HK-2 cells were exposed to 24 h hypoxia, and the effect of Dexa incubation on SGK-1 expression / activation and on cell death was studied. In an in vivo rat model of unilateral renal IR, animals were treated with Dexa, and serum renal function parameters, tissue injury and SGK-1 expression and localization were examined after different reperfusion times (2 h, 4 h and 24 h). Dexa at a dose of 2 mg/L exerted a protective effect on cell survival assessed by LDH release and vital staining paralleled by marked up-regulation of SGK-1. In rats, 2 mg/kg Dexa treatment 24 h prior to ischemia resulted in less severe tissue injury and ameliorated urea nitrogen levels 24 h after reperfusion. Furthermore, SGK-1 expression and phosphorylation were higher in Dexa animals demonstrated by Western blot and immunofluorescence technique. Our results provide novel data on the signalling mechanism of Dexa under hypoxia / ischemia and further support that Dexa emerges as an attractive pharmacological agent for the prevention of ischemic injury.

Restricted access
Cereal Research Communications
Authors:
T. Tóth
,
T. Németh
,
A. Bidló
,
F. Dér
,
M. Fekete
,
T. Fábián
,
Z. Gaál
,
B. Heil
,
T. Hermann
,
E. Horváth
,
G. Kovács
,
A. Makó
,
F. Máté
,
K. Mészáros
,
Z. Patocskai
,
F. Speiser
,
I. Szűcs
,
G. Tóth
,
Gy. Várallyay
,
J. Vass
, and
Sz. Vinogradov
Restricted access