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Search Results: 1 - 10 of 119488 matches for " Ana Gregor i "
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Pesticide residues in samples of apples, lettuce and potatoes from integrated pest management in Slovenia from 2005-2009
Helena Ba a esnik, pela Velikonja Bolta, Ana Gregor i
Acta agriculturae Slovenica , 2012, DOI: 10.2478/v10014-012-0006-3
Abstract: In the period from 2005 to 2009 225 samples of apples, lettuce and potatoes from Slovene producers included in integrated pest management (IPM) were analysed for plant protection product (PPP) residues. The samples were analysed for the presence of more than 200 different active compounds using four analytical methods. In 38.7% of apple samples residues were not detected, 58.6% of apple samples contained residues lower than or equal to Maximum Residue Levels (MRLs) while 2.7% of apple samples exceeded MRLs. In 84.6% of lettuce samples residues were not detected, 12.3% of lettuce samples contained residues lower than or equal to MRLs while 3.1% of lettuce samples exceeded MRLs. In 98.0% of potato samples residues were not detected, 2.0% of potato samples contained residues lower than or equal to MRLs and no potato samples exceeded MRLs. Multiple residues were found only in apples and lettuce. The trend observed during the years was the decrease of sample portion of samples containing multiple residues in apples from 2005 to 2008. The most frequently found active substance in apples and lettuce was dithiocarbamates. In potato only phosalone was found.
PLANT PROTECTION PRODUCT RESIDUES IN AGRICULTURAL PRODUCTS OF SLOVENE ORIGIN FOUND IN 2008
Helena BA?A ?ESNIK,?pela VELIKONJA BOLTA,Ana GREGORI
Journal of Central European Agriculture , 2012, DOI: 10.5513/jcea01/12.4.970
Abstract: In the year 2008, 166 apple, bean, carrot, cucumber, lettuce, pear, potato and spinach samples from Slovene producers were analysed for plant protection product residues. The samples were analysed for the presence of 158 different active compounds using three analytical methods. In two samples (1.2%) exceeded maximum residue levels (MRLs) were determined which is better than the results of the monitoring of pesticide residues in the products of plant origin in the 27 European Union, Member States (EU MS) and 2 European Free Trade Association (EFTA) States: Norway and Iceland in 2008 (2.2%). The most frequently found active substance in agricultural products was dithiocarbamates. Products which contained 4 or more active substances per sample were apples and pears.
PLANT PROTECTION PRODUCT RESIDUES IN APPLES, CAULIFLOWER, CEREALS, GRAPE, LETTUCE, PEAS, PEPPERS, POTATOES AND STRAWBERRIES OF THE SLOVENE ORIGIN IN 2006
Helena BA?A ?ESNIK,Ana GREGORI,?pela VELIKONJA BOLTA
Journal of Central European Agriculture , 2010,
Abstract: In the year 2006, 181 apple, cauliflower, cereal, grape, lettuce, pea, pepper, potato and strawberry samples from Slovene producers were analysed for plant protection product residues. The samples were analysed for the presence of 86 different active compounds using four analytical methods. In nine samples (5.0 %) exceeded maximum residue levels (MRLs) were determined which is comparable with the results of the monitoring of plant protection product residues in products of plant origin in the European union, Norway, Iceland and Liechtenstein in 2005 (4.9 %).
MONITORING OF PESTICIDE RESIDUES IN AGRICULTURAL PRODUCTS IN THE YEARS 2003 AND 2004 IN SLOVENIA
Helena BA?A ?ESNIK,Ana GREGORI,?pela VELIKONJA BOLTA
Journal of Central European Agriculture , 2006,
Abstract: Agricultural Institute of Slovenia was performing national monitoring for pesticide residues in agricultural products according to the Decree on Monitoring of Pesticides in Foodstuffs and in Agricultural Products (Offi cial Gazette of the Republic of Slovenia No. 13/99). Constant measurements are necessary due to intensive agricultural production and use of chemical substances for plant protection. Due to the nutrition characteristic for the Slovenians pesticide residues are monitored each year in the samples of potato, lettuce and apples; the choice of other agricultural products and active substances analysed are adapted to the guidelines indicated in the EU recommendations. In the years 2003 and 2004 we analysed the presence of pesticide residues in 361 samples of agricultural products: caulifl ower, head cabbage, grapes, apples, strawberries, potatoes, peppers, tomatoes, wheat and lettuce from eight different growing areas of Slovenia. All agricultural products were analysed in 2003 for the presence of 51 active substances and in 2004 for the presence of 57 active substances. The maximum residue level (MRL) was exceeded by 6.6 % samples inspected. Potato contributed a major share to this, since in 5.0 % of samples exceeded values of dithiocarbamate residues were determined, however, they were the only active substance found in potato. In 39.1 % of analysed samples residues lower than MRL were determined, in 54.3 % of samples residues were not found or they were below the level of detection method. The greatest number of pesticide residues which did not exceed MRLs was found in fruit, f. ex.: eight in apples and six in strawberries. Residues of dithiocarbamates were the most frequently found active substance in agricultural products.
Stone is alive in Kostel - Geology in the school for education outdoors
Brigita Gregori
Geologija , 2006,
Abstract: Under the definitionof The European Institute for Outdoor Adventure Education and Experimental Learning geology is one of four sciences, which, with its subjects and me-thods, enables pupils to explore the environment. Teaching topics that include geological themes, run by The Centre for School and Outdoor Education (CSOE), under management of the school for outdoor education, are numerous. In the syllabi for nine-year primary school geological topics are dispersed among numerous subjects.The residential houses of CSOE are, because of their focus on teaching outdoors and using special teaching approaches and methods, probably the most creative space in Slovenia for the popularisation of Geology among youth. This article introduces the content with geological themes in the residential house Fara. The topic of Stones in Kostel demonstrates that geological topics should also be used in the lower classes of primary school both from the point of view compatibility with school syllabi as from the point of view of the pupils’ interest in them. We present some didactic approaches for outdoor teaching, which helped towards the introduction and continued inclusion of geological topics in the Slovenian outdoor education.
Jo ef ifrer celebrates his high life jubilee
Branko Ber?i,Gregor Kocijan
Knji?nica : Revija za Podro?je Bibliotekarstva in Informacijske Znanosti , 2002,
Abstract:
Cenntenial anniversary of birth of Alfonz Gspan (1904-1977)
Branko Ber?i,Gregor Kocijan
Knji?nica : Revija za Podro?je Bibliotekarstva in Informacijske Znanosti , 2005,
Abstract:
Genetic Variability of two Fagus sylvatica (L.) Populations in the South-Western Edge of the Panonnian Plain
BO?I, Gregor,KUTNAR, Lado
Acta Silvatica & Lignaria Hungarica , 2012,
Abstract: Two beech populations at altitudes of 273 m (Vrhovo) and 657 m (Kozarje), growing on significantly different forest site, in different ecological conditions and with different forest-management history were selected on Gorjanci Mountains and genetically investigated by means of isoenzyme analysis. A cline from minor to major allelic polymorphism was revealed at gene loci Aco-B, Idh-A and 6-Pgdh-A. At locus Skdh-A, allele A4 was observed only at the lower altitude population Vrhovo as a heterozygote genotype Skdh-A34 (12%). The Kozarje population of beech had a slightly higher genetic multiplicity, a slightly higher effective number of alleles per locus, higher observed heterozygosity and a higher level of intrapopulation differentiation. Statistically significant differences in the occurrence of alleles between populations were found at 5 of 16 loci. The average genetic distance of Gregorius (1974) was 6.1%. European beech populations analyzed from different altitudes on Gorjanci Mountains appeared to be genetically differentiated. The results presented are also discussed in the light of the climate change impact on forests.
Impurities in triangular lattice spin 1/2 antiferromagnet
Karol Gregor,Olexei I. Motrunich
Physics , 2008, DOI: 10.1103/PhysRevB.79.024421
Abstract: We study effects of nonmagnetic impurities in a spin-1/2 frustrated triangular antiferromagnet with the aim of understanding the observed broadening of $^{13}$C NMR lines in the organic spin liquid material $\kappa$-(ET)$_2$Cu$_2$(CN)$_3$. For high temperatures down to $J/3$, we calculate local susceptibility near a nonmagnetic impurity and near a grain boundary for the nearest neighbor Heisenberg model in high temperature series expansion. We find that the local susceptibility decays to the uniform one in few lattice spacings, and for a low density of impurities we would not be able to explain the line broadening present in the experiments already at elevated temperatures. At low temperatures, we assume a gapless spin liquid with a Fermi surface of spinons. We calculate the local susceptibility in the mean field and also go beyond the mean field by Gutzwiller projection. The zero temperature local susceptibility decays as a power law and oscillates at $2 k_F$. As in the high temperature analysis we find that a low density of impurities is not able to explain the observed broadening of the lines. We are thus led to conclude that there is more disorder in the system. We find that a large density of point-like disorder gives broadening that is consistent with the experiment down to about 5K, but that below this temperature additional mechanism is likely needed.
Studies of non-magnetic impurities in the spin-1/2 Kagome Antiferromagnet
Karol Gregor,Olexei I. Motrunich
Physics , 2008, DOI: 10.1103/PhysRevB.77.184423
Abstract: Motivated by recent experiments on ZnCu$_3$(OH)$_6$Cl$_2$, we study the inhomogeneous Knight shifts (local susceptibilities) of spin 1/2 Kagome antiferromagnet in the presence of nonmagnetic impurities. Using high temperature series expansion, we calculate the local susceptibility and its histogram down to about T=0.4J. At low temperatures, we explore a Dirac spin liquid proposal and calculate the local susceptibility in the mean field and beyond mean field using Gutzwiller projection, finding the overall picture to be consistent with the NMR experiments.
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