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Progress in Agricultural Engineering Sciences
Authors:
V. Parrag
,
Z. Gillay
,
Z. Kovács
,
A. Zitek
,
K. Böhm
,
B. Hinterstoisser
,
R. Krska
,
M. Sulyok
,
J. Felföldi
,
F. Firtha
, and
L. Baranyai

Abstract

One of the most important food safety issues is the detection of mycotoxins, the ubiquitous, natural contaminants in cereals. Hyperspectral imaging (HSI) is a new method in food science, it can be used to predict non-destructively the changes in composition and distribution of compounds. That is why, in the last decade, the potential of HSI has been evaluated in many fields of food science, including mycotoxin research.

The aim of the recent study was to test the feasibility of HSI for the differentiation according to the toxin content of cornmeal samples inoculated with Fusarium graminearum, Fusarium verticillioides and Fusarium culmorum and samples with natural levels of mycotoxins. Samples were measured in the near infrared wavelength range of 900–1,700 nm and mean spectra of selected regions of interest of each image were pre-treated using Savitzky-Golay smoothing and standard normal variate (SNV) method. On the spectra, partial least squares discriminant analysis (PLS-DA) was carried out according to the level of contamination. Partial least squares regression (PLSR) method was used to predict deoxynivalenol (DON) content of samples and the cumulative toxin content: the sum of fumonisins (FB1, FB2) and DON content of samples. Based on the promising results of the study, HSI has the potential to be used as a preliminary testing method for mycotoxin content in feed materials.

Open access
Progress in Agricultural Engineering Sciences
Authors:
K. Szalay
,
B. Keller
,
R. Rák
,
N. Péterfalvi
,
L. Kovács
,
J. Souček
,
F. Sillinger
, and
A. Jung

Abstract

One of the biggest challenges of raspberry production in Hungary nowadays is reducing the unfavorable effects of climate change. The maturation phase of main varieties within this region falls in a period of extremely high temperature and atmospheric drought detaining desirable fruit growth. Dedicated plant breeding alone is not enough. An immediate action is required. There has been a need for physical protection against excessive direct radiation. In order to restore, or even save the domestic raspberry production and market, introducing of greenhouse or polytunnel solutions are needed. Experimental plantations of three different raspberry varieties were set in two repetitions: covered and uncovered versions. Each cover has characteristic interaction with light which can generate different environmental conditions and also differences in plant growth and fruit quality. Besides the monitoring of elementary biological indicators, a wide range of sensors (temperature, humidity, solar irradiation) was used to identify differences and to find the optimal tunnel material for maximal plant productivity. Within the framework of the project we also tested a portable spectroradiometer and a snapshot imaging camera to study the practical value of proximal sensing in water- and photosynthetic light use efficiency and vitality mapping.

Open 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
Journal of Radioanalytical and Nuclear Chemistry
Authors:
A. Türler
,
H. Gäggeler
,
K. Gregorich
,
H. Barth
,
W. Brüchle
,
K. Czerwinski
,
M. Gober
,
N. Hannink
,
R. Henderson
,
D. Hoffman
,
D. Jost
,
C. Kacher
,
B. Kadkhodayan
,
J. Kovacs
,
J. Kratz
,
S. Kreek
,
D. Lee
,
J. Leyba
,
M. Nurmia
,
M. Schädel
,
U. Scherer
,
Schimpf
,
D. Vermeulen
,
A. Weber
,
H. Zimmermann
, and
I. Zvara

Abstract  

On-line isothermal gas phase chromatography was used to study halides of261104 (T1/2=65 s) and262,263105 (T1/2=34 s and 27 s) produced an atom-at-a time via the reactions248Cm(18O, 5n) and249Bk(18O, 5n, 4n), respectively. Using HBr and HCl gas as halogenating agents, we were able to produce volatile bromides and chlorides of the above mentioned elements and study their behavior compared to their lighter homologs in Groups 4 or 5 of the periodic table. Element 104 formed more volatile bromide than its homolog Hf. In contrast, element 105 bromides were found to be less volatile than the bromides of the group 5 elements Nb and Ta. Both 104 and Hf chlorides were observed to be more volatile than their respective bromides.

Restricted access