Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 152

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 8 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  contamination
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 8 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Origin of synthetic particles in honeys

100%
A total of 47 honeys and 22 flowering plants was analysed for their load of synthetic fibres and fragments. In all samples investigated foreign particles were found. These include also black carbon particles which were not enumerated. Fibres and fragments ranged from 10 to 336 kg-1 and 2 to 82 kg-1 honey, respectively. The data of the flowering plants analysed indicate that a major proportion of the particle load may originate from external sources, i.e. these particles are brought into the beehive by the worker bees during nectar collection.
This paper summarizes measurements of the radioactivity of soil and plant samples from the part of the Łęczna-Włodawa lake district, which is under a re-naturalization project, in Lublin and Chełm provinces (Eastern Poland). The aim of the studies was to determine the concentrations of particular radionuclides in the soils and plants of this district. The total radioactivity is reported as well as the contribution of artificial radionuclides (Cs-134, C-137) whose presence is due to radioactive fall-out. The total radioactivity of the soil samples ranges from 100-900 Bq/kg, and that of plant samples from 100—1300 Bq/kg. Contamination by radiocesium depends on the migration of water.
The low concentration of beryllium in waters requires the use of adequate methods for preparing the samples and adequate equipment for determining its concentration. This study presents the methodology for determining beryllium concentration in surface waters using the ICP-AES method as well as showing data that refer to the concentration of this element in surface waters from the selected monitoring points located on the Vistula, Przemsza and Klodnica Rivers.
The objective of the laboratory experiment was to study the resistance to lead ions of bacteria isolated from soil with various level of contamination with this element. Lead (II) acetate trihydrate was applied to the soil (sandy loam) in two doses so that the total content of lead corresponded to weak (250 mg kg⁻¹) and strong (5000 mg kg⁻¹) contamination of soil with lead. From each of the soil (control, weakly and strongly contaminated soil) bacterial isolates were obtained and several dozen of them were randomly chosen for the experiment. The isolates were severally point wise cultured in three repetitions onto microbiological medium contaminated with lead (1000 mg dm⁻³) and on the same control medium. The diameter of grown “twin” colonies in both cultures were compared. For each isolate separately the resistance index (RI) was described as a ratio of bacterial cultures diameter of the soil isolate cultured on the contaminated medium to the diameter of the same isolate cultured on the control medium. On the basis of the various RI results, the bacteria were divided into four resistance groups (RG) of approximate resistance index: I group, RI = 0 – entirely sensitive bacteria (no growth on the contaminated medium); II group 0
13
86%
The aim of this work was to explore the possibilities of utilising the macroalgae accumulating on the Sopot beach, a part of the Gulf of Gdańsk (Baltic Sea). During this work (2004–2006) a range of activities were undertaken: monitoring the occurrence of macroalgae, collection of plant material, taxonomic identification, laboratory analyses of contamination (metals – Cd, Pb, Ni, Zn, Cu, Cr, Hg; radionuclides – 137Cs, 40K; organic contaminants – polychlorinated biphenyls, polycyclic aromatic hydrocarbons), the stage of algal degradation and studying possible uses of the plant material collected on the beach. The most suitable way of utilising the plant material seems to be as a biofertiliser. Laboratory growth tests were carried out to assess this possible use; they were successful.
The purpose of the studies was to determine, by means of bacteriological and molecular methods, the occurrence of Y. enterocolitica in the faeces of dogs, as well as to assess the degree of their spread in the urban environment. The faeces were collected from the lawns of six large districts of Olsztyn. In order to isolate Y. enterocolitica, "warm culture" (ITC/CIN) and "cold culture" (PSB/CIN) were used in parallel, together with biochemical tests. Next, genomic DNA of Y. enterocolitica was isolated and αil, ystA, and ystB genes were detected with the use of the multiplex PCR method. A relatively frequent occurrence of Y. enterocolitica strains in canine faeces contaminating the urban lawns of Olsztyn was demonstrated. The greatest percentage of contaminated faecal samples was found in the area of large housing estates. By means of molecular tests, the presence of ystB gene only, in the absence of αil and ystA genes, was demonstrated in the Y enterocolitica genome, which could indicate a potentially pathogenic biotype 1A. Therefore, it seems important to keep monitoring the changes, which occur within this species of microorganisms, the epidemiological situation of yersiniosis in human and animal populations, as well as to continue the studies on the epidemiology of Y enterocolitica infections also in the context of a reservoir of animals accompanying a man.
Current levels of radiocaesium in game were determined. Samples were taken in 10 regions and measured for their ¹³⁷Cs and ¹³⁴Cs activity concentrations. ¹³⁷Cs was found at measurable levels in the samples analysed. ¹³⁴Cs activity concentrations were negligible (below minimum detectable activity - MDA). The ¹³⁷Cs activity concentrations were very variable between and among the animal species even in the same region and ranged from MDA values to some tens of Bq/kg. An effective dose received by the most exposed populations was assessed.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 8 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.