排序方式: 共有79条查询结果,搜索用时 31 毫秒
41.
Marija M. Saric-Krsmanovic Dragana M. Bozic Ljiljana M. Radivojevic Jelena S. Gajic Umiljendic 《Journal of environmental science and health. Part. B》2017,52(11):812-816
The effects of field dodder on physiological and anatomical processes in untreated sugar beet plants and the effects of propyzamide on field dodder were examined under controlled conditions. The experiment included the following variants: N—noninfested sugar beet plants (control); I - infested sugar beet plants (untreated), and infested plants treated with propyzamide (1500 g a.i. ha?1 (T1) and 2000 g a.i. ha?1(T2)). The following parameters were checked: physiological—pigment contents (chlorophyll a, chlorophyll b, total carotenoids); anatomical -leaf parameters: thickness of epidermis, parenchyma and spongy tissue, mesophyll and underside leaf epidermis, and diameter of bundle sheath cells; petiole parameters: diameter of tracheid, petiole hydraulic conductance, xylem surface, phloem cell diameter and phloem area in sugar beet plants. A conventional paraffin wax method was used to prepare the samples for microscopy. Pigment contents were measured spectrophotometrically after methanol extraction. All parameters were measured: prior to herbicide application (0 assessment), then 7, 14, 21, 28 and 35 days after application (DAA). Field dodder was found to affect the pigment contents in untreated sugar beet plants, causing significant reductions. Conversely, reduction in the treated plants decreased 27% to 4% for chlorophyll a, from 21% to 5% for chlorophyll b, and from 28% to 5% for carotenoids (T1). Also, in treatment T2, reduction decreased in infested and treated plants from 19% to 2% for chlorophyll a, from 21% to 2% for chlorophyll b, from 23% to 3% for carotenoids and stimulation of 1% and 2% was observed 28 and 35 DAA, respectively. Plants infested (untreated) by field dodder had lower values of most anatomical parameters, compared to noninfested plants. The measured anatomical parameters of sugar beet leaves and petiole had significantly higher values in noninfested plants and plants treated with propyzamide than in untreated plants. Also, the results showed that propyzamide is an adequate herbicide for control of field dodder at the stage of early infestation. 相似文献
42.
Bogdanovic J Wouters IM Sander I Zahradnik E Joanne HR Rodrigo MJ Gómez-Ollés S Heederik DJ Doekes G 《Journal of environmental monitoring : JEM》2006,8(10):1043-1048
Well-validated methods for measuring airborne occupational allergens are essential for effective control and reduction of allergen exposures. For wheat flour allergens, specific immunoassays are available, but there is a need for optimisation and standardization of sample processing procedures. Wheat flour allergen elution and storage were studied using airborne dust samples collected in bakeries with a new parallel sampler. Forty-eight series of 9 parallel filters were subjected to extraction procedures varying in elution medium, shaking method, extraction vial, and centrifugation speed. Wheat allergens were measured with enzyme immunoassays, and the effect of various procedures evaluated by mixed regression analyses. The stability of the eluted allergens was assessed after storage for 20 days and 4 months at -20 degrees C, in the presence or absence of casein in the medium. Only the type of elution medium had significant effects on allergen recovery: addition of Tween-20 resulted in 3- to 100-fold increased levels, an effect that was most pronounced at low concentrations. Allergen levels in extracts were stable for at least 4 months at -20 degrees C, irrespective of the presence of casein in the medium. Addition of Tween-20 to the elution medium is essential for optimal extraction of wheat allergen. The recommended procedure further includes the use of conventional polystyrene tubes, simple shaking methods, and centrifugation after extraction. Wheat dust extracts in PBS-Tween can be stored frozen for at least 4 months, and addition of a stabilising protein is not required. 相似文献
43.
Jelena Milinovic Silvia Lacorte Anna Rigol Miquel Vidal 《Environmental science and pollution research international》2016,23(9):8339-8348
The sorption behaviour of three perfluoroalkyl substances (PFASs) (perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorobutanesulfonic acid (PFBS)) was studied in sewage sludge samples. Sorption isotherms were obtained by varying initial concentrations of PFOS, PFOA and PFBS. The maximum values of the sorption solid–liquid distribution coefficients (Kd,max) varied by almost two orders of magnitude among the target PFASs: 140–281 mL g?1 for PFOS, 30–54 mL g?1 for PFOA and 9–18 mL g?1 for PFBS. Freundlich and linear fittings were appropriate for describing the sorption behaviour of PFASs in the sludge samples, and the derived KF and Kd,linear parameters correlated well. The hydrophobicity of the PFASs was the key parameter that influenced their sorption in sewage sludge. Sorption parameters and log(KOW) were correlated, and for PFOS (the most hydrophobic compound), pH and Ca?+?Mg status of the sludge controlled the variation in the sorption parameter values. Sorption reversibility was also tested from desorption isotherms, which were also linear. Desorption parameters were systematically higher than the corresponding sorption parameters (up to sixfold higher), thus indicating a significant degree of irreversible sorption, which decreased in the sequence PFOS?>?PFOA?>?PFBS. 相似文献
44.
Ivana Potočnik Jelena Vukojević Mirjana Stajić Emil Rekanović Svetlana Milijašević Miloš Stepanović 《Journal of environmental science and health. Part. B》2013,48(8):823-827
Isolates of Cladobotryum dendroides from Serbian mushroom farms and Agaricus bisporus F56 were tested for sensitivity to selected fungicides in vitro. Chlorothalonil was the most toxic fungicide to C. dendroides isolates (EC50 values were below 1.68 mg L? 1). Trifloxystrobin and kresoxim-methyl were not effective in growth inhibition of C. dendroides isolates (EC50 values exceeded 300 mg L? 1). Metalaxyl-M+mancozeb was the most toxic fungicide to strain F56 of A. bisporus, and iprodione the least toxic. The fungicide selectivity indexes for both C. dendroides and A. bisporus indicated that iprodione, chlorothalonil, captan and metalaxyl-M+mancozeb had satisfactory selective fungitoxicity. Iprodione had the best selectivity to both the pathogen and the host, although inferior than prochloraz manganese and carbendazim, fungicides officially recommended for mushroom cultivation in European Union (EU) countries. 相似文献
45.
Dragana Todorović Dragana Popović Jelena Ajtić Jelena Nikolić 《Environmental science and pollution research international》2013,20(1):525-532
Leaves of linden (Tilia tomentosa L. and Tilia cordata Mill.) and horse chestnut (Aesculus hippocastanum L.) were analysed as biomonitors of radionuclides in urban air. Samples of soils, leaves and aerosols were collected in Belgrade, Serbia. Activities of 137Cs, 40K, 210Pb and 7Be in the samples were measured on an HPGe detector by standard gamma spectrometry. “Soil-to-leaves” transfer factors were calculated. Student’s t test and linear Pearson correlation coefficients were used for statistical analysis. Differences in local conditions at the sampling sites were not significant, and the mechanisms of the radionuclides’ accumulation in both plant species are similar. Ceasium-137 was detected in some of the leaf samples only. Transfer factors for 137Cs and 40K were (0.03–0.08) and 1.3, respectively. The concentrations of 210Pb and 7Be in leaves were higher in autumn than in spring, and there were some similarities in their seasonal patterns in leaves and in air. Weak to medium correlation was obtained for the 210Pb and 7Be activities in leaves and aerosols. Large positive correlation was obtained for the 210Pb activities in linden leaves and the mean activity in aerosols for the preceding months. Different primary modes of radionuclides accumulation in leaves were observed. Since large positive correlation was obtained for the 210Pb activity in linden leaves and the mean in aerosols for the preceding months, mature linden leaves could be used as biomonitors of recent 210Pb activity in air. 相似文献
46.
Concentration of trace elements in blood and feed of homebred animals in Southern Serbia 总被引:1,自引:1,他引:0
Dragana Popovic Tatjana Bozic Jelka Stevanovic Marina Frontasyeva Dragana Todorovic Jelena Ajtic Vesna Spasic Jokic 《Environmental science and pollution research international》2010,17(5):1119-1128
Background, aim and scope
The paper presents concentrations of trace elements in blood of homebred animals (cows and sheep) from Southern Serbia (Bujanovac) and the contents of natural and anthropogenic radionuclides and some heavy metals in feed. The region of Southern Serbia was exposed to contamination by depleted uranium ammunition during NATO attacks in 1999 and therefore, is of great concern to environmental pollution and human and animal health. 相似文献47.
Đurđić Slađana Stanković Vesna Ražić Slavica Mutić Jelena 《Environmental science and pollution research international》2021,28(42):59003-59014
Environmental Science and Pollution Research - The analysis of isotope ratios of lead in the mushrooms and soil, where they were grown, assisted with a principal component analysis, offered a new... 相似文献
48.
Ivanović Jelena Janjić Jelena Baltić Milan Milanov Raša Bošković Marija Marković Radmila V. Glamočlija Nataša 《Environmental science and pollution research international》2016,23(17):17105-17112
Environmental Science and Pollution Research - The aim of this study was to investigate the presence of metal contamination in water, sediments and three different fish species. All samples were... 相似文献
49.
Peter Mackelworth Draško Holcer Jelena Jovanović Caterina Fortuna 《Environmental management》2011,47(4):644-655
The European Union (EU) is the world’s largest trading bloc and the most influential supra-national organisation in the region.
The EU has been the goal for many eastern European States, for Croatia accession remains a priority and underpins many of
its national policies. However, entry into the EU requires certain commitments and concessions. In October 2003 the Croatian
parliament declared an ecological and fisheries protection zone in the Adriatic. Under pressure the zone was suspended, finally
entering into force in March 2008 exempting EU States. There are other marine conflicts between Croatia and the EU, particularly
the contested maritime border with Slovenia, and the development of the Croatian fishing fleet in opposition to the Common
Fisheries Policy. Conversely, attempts to harmonise Croatian Nature Protection with the EU Habitats Directive, facilitated
by pre-accession funding, has galvanised conservation policy. Since 2005 two marine protected areas have been declared, significantly
increasing the marine ecosystem under protection. Finally, the development of the Marine Strategy Framework Directive is the
latest EU attempt to integrate environmental policy in the maritime realm. This will have an effect not only on member States
but neighbouring countries. For marine nature protection to be effective in the region the Adriatic Sea needs to be viewed
as a mutually important shared and limited resource not a bargaining chip. Negotiations of the EU and Croatia have been watched
closely by the other Balkan States and precedents set in this case have the potential to affect EU expansion to the East. 相似文献
50.
Bulatović Sandra Ilić Mila Šolević Knudsen Tatjana Milić Jelena Pucarević Mira Jovančićević Branimir Vrvić Miroslav M. 《Environmental geochemistry and health》2022,44(10):3451-3472
Environmental Geochemistry and Health - The oil pollutant in the Sava River aquifer in the residential area of Belgrade, Serbia was investigated in order to analyze the extent, origin and spatial... 相似文献