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141.
Marija Sarić-Krsmanović Jelena Gajić Umiljendić Ljiljana Radivojević Ljiljana Šantrić Ivana Potočnik Rada Đurović-Pejčev 《Journal of environmental science and health. Part. B》2019,54(4):247-251
The evaluation of the inhibition effect exerted by the essential oils of basil (Ocimum basilicum), sage (Salvia officinalis), thyme (Thymus vulgaris), lemon balm (Melissa officinalis) and goldenrod (Solidago virgaurea) on seeds germination and early seedling growth of velvetleaf (Abutilon theophrasti Medik.) weed was examined in a laboratory bioassay. The essential oils were obtained by hydrodistillation and characterized chemically by gas chromatography coupled with both mass spectrometry and flame ionization detector. The working solutions of essential oil emulsified with Tween 20 and dissolved in distilled water were prepared at three concentration levels (0.01%, 0.1% and 1%, vol/vol). The results obtained showed that increase of essential oil concentration leads to decrease of seed germination, shoot and radical length of velvetleaf. The obtained data revealed a highly significant effect (P?<?0.05) between control and 1% and 0.1% oil concentrations in all treatments. The essential oils of basil, thyme and lemon balm exhibited more powerful bio-herbicidal effect compared to sage and goldenrod essential oils on the germination and early seedling growth of velvetleaf weed. 相似文献
142.
Ana-Marija Domijan Ana Marija Marjanović Čermak Ana Vulić Ivana Tartaro Bujak Ivan Pavičić Jelka Pleadin 《Journal of environmental science and health. Part. B》2019,54(3):155-162
Toxicity of gamma irradiated mycotoxins aflatoxin B1 (AFB1) and ochratoxin A (OTA) was investigated in vitro. AFB1 and OTA stock solutions (50?mM, in methanol) were gamma irradiated (5 and 10 kGy) and non-irradiated and irradiated mycotoxins solutions were tested for cytotoxicity on Pk15, HepG2 and SH-SY5Y cell lines (MTT assay, 1–500?μM concentration range; 24?h exposure). Degradation of mycotoxin molecules was examined by liquid chromatography tandem mass spectrometry (HPLC-MS/MS). AFB1 and OTA radiolytic products were less toxic than the parent mycotoxins to all of the tested cell lines. Gamma irradiation even at 5 kGy had effect on AFB1 and OTA molecules however, this effect was dependent on chemical structure of mycotoxin. Since gamma irradiation at low dose reduced initial level of both mycotoxins, and gamma irradiated mycotoxins had lower toxicity in comparison to non-irradiated mycotoxins, it can be concluded that gamma irradiation could be used as decontamination method. 相似文献
143.
Adamović Vladimir M. Antanasijević Davor Z. Ristić Mirjana Đ. Perić-Grujić Aleksandra A. Pocajt Viktor V. 《Journal of Material Cycles and Waste Management》2018,20(3):1736-1750
Journal of Material Cycles and Waste Management - This paper presents a development of general regression neural network (a form of artificial neural network) models for the prediction of annual... 相似文献
144.
Lazar M. Kaluđerović Zorica P. Tomić Rada D. Đurović-Pejčev Predrag J. Vulić Darko P. Ašanin 《Journal of environmental science and health. Part. B》2017,52(5):291-297
This study was undertaken to determine the impact of the organic complex concentration on the adsorption of herbicide (acetochlor) at the surface of the organic modified montmorillonite. In this work, natural montmorillonite from Bogovina (Boljevac municipality, Serbia) was used for organic modification. Cation-exchange capacity of this montmorillonite was determined using a methylene blue method (86 mmol/100 g of clay). Montmorillonite has been modified first with NaCl and then with hexadecyltrimethylammonium bromide (HDTMA-bromide) organic complex. Saturation of cation exchange capacity (CEC) was 50%, 100%, and 150%. Changes in the properties of the inorganic and organic montmorillonite have been examined using the X-ray diffraction, Fourier transform infrared spectroscopy, and batch equilibrium method. Montmorillonite modified with HDTMA-bromide demonstrated higher uptake of the herbicide, compared to the inorganic montmorillonite. Comparing the values Freundlich coefficients in batch equilibrium method, it can be seen that the adsorption of acetochlor decreased in the series: 0.5 CEC HM > 1 CEC HM > 1.5 CEC HM > NaM. 相似文献
145.
Radić Danka S. Pavlović Vera P. Lazović Milana M. Jovičić-Petrović Jelena P. Karličić Vera M. Lalević Blažo T. Raičević Vera B. 《Environmental science and pollution research international》2017,24(27):21885-21893
Environmental Science and Pollution Research - Modern, efficient, and cost-effective approach to remediation of heavy metal-contaminated soil is based on the application of microorganisms. In this... 相似文献
146.
Hodgkin–Huxley model, describing generation of action potentials in axons’ membranes, has been used for appreciation of the
possible mechanisms of electromagnetic fields influence on neurons’ electrical activity. It follows from the carried calculations
that flowing through an axon of the external current pulses, which have an area of rise, an area of DC, and an area of drop,
does not influence own excitation pulses passage if periods of rise and drop are slope enough. Depending on the external current
parameters, own excitation pulses may not be influenced or may be suppressed at greater velocity of rise and drop of an external
current. Moreover, induced excitation pulses appear at definite parameters of an external current. In the case, when at passage
through an axon of an external current, own excitation pulses follow one by one (paired pulse facilitation), and the second
pulse may be suppressed if its level will not be increased additionally in comparison with the case of an external current
absence. It is possible that such increase happens “automatically” as a result of “tuning” (adaptation) of axons to the conditions
of flowing through them of an external current. It may be an explanation of the phenomena observed in experiments. 相似文献
147.
Our laboratory investigation aimed at assessing to what extent suspended particles could adsorb formaldehyde, allowing it, when inhaled, to penetrate deeper into the lung. We used two types of pure soot, N-220 and N-660 (the former being a highly active oil furnace soot with smaller particles and a larger surface area than the latter), because of their chemical inactivity and the adsorptive properties. The results obtained in experimental conditions showed that soot particles could bind 2.3 to 50.2% of formaldehyde, depending on the particle size, relative humidity, amount of particles and the duration of the contact. The recovery of formaldehyde from the particles was also tested. Further investigation is planned under realistic conditions. 相似文献
148.
Marković DM Marković DA Jovanović A Lazić L Mijić Z 《Environmental monitoring and assessment》2008,145(1-3):349-359
O(3), NO(2), SO(2), CO and PM(10) concentrations, simultaneously determined for the first time in Belgrade urban area in the autumnal period of 2005, are presented. The obtained results display similar behaviour of SO(2), NO(2), CO, PM(10) opposite from that of O(3). The weekend effect was also investigated showing diminution of average daily concentrations of SO(2), NO(2), PM(10) and CO for 72, 40, 37 and 42% respectively, and increase of the average daily concentration of O(3) for 56%. Influence of meteorological conditions on observed concentration levels was studied, too. The observed influence of wind speed on the O(3) nightly concentration levels was analyzed pointing to the phenomena of O(3) transport during episodic measurements. To make an identification of possible pollution sources and analyse the influence of meteorological parameters on pollution levels, air back trajectories for high level concentrations episodes were calculated and analysed. A multivariate receptor modelling (Principal Component Analysis, Cluster Analysis) has been applied to a set of data in order to determine the contribution of different sources. It was found that the main principal components, extracted from the air pollution data, were related to gasoline combustion, oil combustion and ozone transport. 相似文献
149.
Marković DM Novović I Vilotić D Ignjatović Lj 《Environmental monitoring and assessment》2009,153(1-4):377-382
In this work, experiments were undertaken in an open field having 10,000 m2 area purified from any noise on 121 survey stations using the central frequencies of seven different octave bands with a single and double artificially formed sources of noise. Meteorological parameters such as temperature, humidity, atmospheric pressure, velocity and direction of wind were also taken into consideration. Additionally, the effect of reflecting waves from any surface was also experimentally examined. To evaluate the data obtained, the statistical program of SPSS 9.05 was utilized. From this research, an equation utilising all the parameters was developed. 相似文献
150.
The long-term behaviour of (137)Cs activity concentrations in air and fallout has been studied in the city of Zagreb for the post-Chernobyl period (1986-2006) as a part of an extended monitoring program of radioactive contamination of human environment in Croatia. Annual mean (137)Cs activity concentrations in air and annual total deposition fluxes (wet plus dry) decreased from 2.8 x 10(-4) Bq m(-3) in September 1986 to 3.0 x 10(-6) Bq m(-3) in last quarter of 2006 and from 6,410 Bq m(-2) year(-1) in 1986 to 2 Bq m(-2) year(-1) in 2006 respectively. By fitting the measured (137)Cs activity concentrations to the theoretical curve the ecological half-lives of (137)Cs in air and fallout were estimated with respective values of 0.46 and 0.54 years for immediate post-Chernobyl period, increasing to 5.52 and 3.97 years afterwards. Using the data on (137)Cs activity concentrations in air and fallout total caesium deposition velocity of (3.34 +/- 3.13) x 10(-2) ms(-1) was estimated with median value being 2.13 x 10(-2) ms(-1). Such relatively high (137)Cs deposition velocities compared with pre-Chernobyl ones, are characteristic for the post-Chernobyl period and, according to Stokes' settling law, indicate that the diameters of aerosol particles associated with (137)Cs originated from the Chernobyl accident are pretty large, i.e. >1 microm. (134)Cs/(137)Cs activity ratio in fallout and in air has been found to be similar to the theoretically predicted values, initial value being about 0.5 and decreasing according to differential radioactive decay. The similar ratio has been observed in most of the other environmental samples. 相似文献