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    Wyświetlanie 1-7 z 7
    Tytuł:
    Metals in organs of bottom sediments and aquatic plants of the Ełk River and its tributaries
    Autorzy:
    Skorbiłowicz, E.
    Skorbiłowicz, M.
    Zamojska, E.
    Wójtowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/184486.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    river
    metals
    bottom sediments
    aquatic plants
    Opis:
    The aim of the work was to analyze the content of Ni, Pb and Cd in organs (root, stem, leaf) Typha latifolia L. and Nuphar lutea as well as bottom sediments of the Ełk River and selected tributaries. An attempt was also made to indicate the factors and processes governing the behavior of the investigated metals in the water environment of the examined rivers. The research object was the Ełk River with its three tributaries - the Gawlik River, the Binduga River and the Kuwasy Canal. Samples of bottom sediments, leaves, stems and roots of Typha latifolia L. and Nuphar lutea were collected in August of 2015. The content of metals was determined by flame atomic absorption spectrometry (F-AAS). The results of analyses of sediments and plant material indicate a lack of environmental pollution by nickel (2.58-8.50 mg-kg-1) and lead (3.82-15.99 mg-kg-1) of the Ełk River and its tributaries whereas the cadmium content ranged from 0.16-0.76 mg-kg-1. Nuphar lutea and Typha latifolia L. showed a varied capacity to accumulate nickel (1.20-10.51 mg-kg-1) and lead (0.04-14.16 mg-kg-1), occurring primarily in the roots. The smallest concentration of nickel and lead was recorded in the stems. The highest concentration of cadmium (2.56 mg-kg-1) was noted in the roots and the lowest (0.01 mg-kg) in the leaves. Factor analysis pointed to the processes of mobilizing elements from bottom sediments as a result of pH drop and their uptake by macrophyte roots and sorption processes of metal ions by macrophytes from river waters and their intensive accumulation in bottom sediments.
    Źródło:
    Geology, Geophysics and Environment; 2018, 44, 3; 281-293
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Mixing Zones for Wastewater With Receiver Waters
    Autorzy:
    Skorbiłowicz, M.
    Skorbiłowicz, E.
    Wójtowicz, P.
    Zamojska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/123741.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    distance of complete mixing
    surface waters
    wastewater discharge
    Opis:
    Discharges from wastewater treatment are among the key sources of pollution, if norms included in the applied legal acts are exceeded. In determining the impact of these objects on water environment it is often assumed that complete mixing wastewater with surface water is in the point or close to the discharge. In fact, the complete mixing of waste water in a short distance from the discharge occurs incidentally depending on the type of sewage receiver. The size and type of specific sewage receiver determines the conditions of self-purification. Complete mixing zone has a huge impact on the intensity of self-purification processes. Therefore, the possibility to determine the size zone of complete mixing of the waste water from the water receiver is important. The issue involves a series of methods, the most computational, which more or less allows to evaluate the distance of mixing waste water. advection, turbulent and molecular diffusion affect mixing wastewater with surface waters. The article discusses the factors influencing the mixing process and the impact of mixing on the self-purification surface waters. The aim of the article is a review of several methods for determining the distance of the segment mix completely discharged wastewater, with regard to the location of their discharge.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 4; 192-198
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Macrophytes as Ełk River Quality Status Evaluation Indicators Based on Example of Nickel
    Autorzy:
    Skorbiłowicz, E.
    Skorbiłowicz, M.
    Zamojska, E.
    Ofman, P.
    Wójtowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/123062.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    river
    nickel
    bottom sediment
    macrophytes
    Opis:
    The aim of the study was to analyze the content of Ni in fractions of 1.0–0.2 mm, 0.2–0.1 mm, 0.1–0.063 mm, 0.063–0.02 mm, and <0.02 mm of river bottom sediments and plants (root, stem, leaf) of broadleaf cattail (Typha latifolia), yellow water lilies (Nuphar lutea), and cowbane (Cicuta virosa). Nickel content in bottom sediment was slightly higher than the geochemical background. The largest amounts of Ni were associated with the finest fraction, while the smallest with the thickest fraction. The highest content of this element was recorded at the point Ełk Barany, which was connected with developing industry in the city of Ełk. All of the tested plants showed greater Ni contents than the amount naturally occurring in plants. In most cases, most of Ni was associated with plant roots, and the least with leaves. It has been proven that aquatic plants can be good indicators of the aquatic environment status.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 3; 155-160
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Impact of Sewage Treatment Plant on the Amount of Heavy Metals in Water of the Supraśl River Catchment Area
    Autorzy:
    Skorbiłowicz, M.
    Skorbiłowicz, E.
    Wójtowicz, P.
    Ofman, P.
    Zamojska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/123581.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    sewage treatment plant
    heavy metals
    water
    Opis:
    The main purpose of this study was to evaluate the effect of treated sewage flowing from sewage treatment plants located in the basin of the Supraśl river on the concentration and load of metals in river waters and its main tributaries. Three measuring- control points were chosen, on the river and its tributaries, located near Gródek, Sokółka and Dobrzyniewo. Selected points were located behind the discharge of treated wastewater from sewage treatment plants respectively – Gródek, Sokółka and Bialystok. The samples of treated sewage and water were collected in a period from May to November, once a month in 2014. Each individual sample was examined for the content of dissolved form of the following metals: Pb2+, Cu2+, Cd2+, Ni2+, Zn2+, Fe2+/3+. After taking into account water flow of the Biała, Sokołda and Supraśl in every month, metals loads expressed in mg·h-1., transported by the Supraśl and its tributaries waters were calculated. In the study monthly metals loads discharged into the Biała, Sokołda and Supraśl by sewage treatment plants in Białystok, Sokółka and Gródek were also calculated. The studies have shown the impact of metals load in treated wastewater on metals loads in waters of studied rivers based on the obtained correlation. Most of the searched relations between loafs of Pb2+ – r = 0,88; Cd2+ – r = 0,98; Fe2+/3+ – r = 0,45; Ni2+ – r = 0,55; Zn2+ – r = 0,86 were obtained in case of wastewater treatment plant in Gródek and Supraśl waters. In the study period we observed a diversity in concentration of Cd2+, Fe2+/3+, Ni2+ and Zn2+ in treated sewage and in river waters, which affected loads of this metals.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 1; 136-142
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pollution Sources and Water Quality State of the Supraśl River
    Autorzy:
    Skorbiłowicz, M.
    Skorbiłowicz, E.
    Wójtowicz, P.
    Ofman, P.
    Zamojska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/124099.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    water quality
    pollution
    river
    wastewater
    Opis:
    The main purpose of the study was to evaluate water quality of the Supraśl river and identify its main pollution sources. On the river and its tributaries, 8 control points were selected, located near Krynica, Gródek, Nowosiółki, Zasady (mouth of the tributary Sokołda), Supraśl, Nowodworce, Dobrzyniewo (mouth of the tributary Biała) and Dzikie. The control points were selected in such a way as to take into account the impact of major point sources of analyzed components located along the river and its main tributaries on water quality in the main stream catchment. Water samples were collected once a month during the period from May to November in 2014. In water samples the concentration of dissolved oxygen, Cl-, SO42-, N-NH4+, P-PO43- and the values of pH, BOD5 and electrolytic conductivity were indicated. Based on the obtained results, loads of the individual components in river waters were calculated as a product of concentration and Supraśl waters flow rate in a particular month. Supraśl waters, due to values of most analyzed parameters, should be classified as first quality class. The source of Cl-, SO42-, N-NH4+ in Supraśl waters were treated wastewater and other anthropogenic sources associated with the basin development. Reduced Supraśl water quality is caused by the inflow of organic substances expressed by BZT5 from natural and anthropogenic origin and concentration of PO43-, which were mainly delivered with treated wastewater.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 2; 64-69
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biotransformacje z udziałem genetycznie modyfikowanych drożdży Saccharomyces cerevisiae
    Biotransformations with genetically modified bakers yeast Saccharomyces cerevisiae
    Autorzy:
    Białecka-Florjańczyk, E.
    Zamojska, W.
    Kapturowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171849.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    Saccharomyces cerevisiae
    biotransformacja
    biokatalizatoy komórkowy
    inżynieria genetyczna
    biotransformations
    whole-cell biocatalysts
    genetic engineering
    Opis:
    Baker’s yeast Saccharomyces cerevisiae is quite commonly applied as a wholecell biocatalysts in biotransformations – reactions based on enzymatic transformations of chemical compounds. Yeast cells are easy in cultivation and use. They are usually used to catalyze such reactions as bioreduction or hydrolysis. The full sequencing of its genome accompanied with achievements of genetic engineering allowed to design new yeast strains characterized by high conversion yield and reaction selectivity. Genetically modified cells of Saccharomyces cerevisiae catalyze biotransformations, which lead to chiral building blocks important in pharmaceutical industry (especially those obtained by reduction of á- and â -oxoesters). „Designer yeast” is a new catalyst for Baeyer–Villiger oxidation. Recombinant yeast lipases have been discussed as useful means in biodiesel production because the microbiological method of producing of this kind of fuel has many advantages. There is a growing interest in application of modified yeast in biotransformation reactions. Modern directions to improve catalytic abilities of baker’s yeast include: the use of surface display technology of enzymes, optimization or increase in availability of cofactor required for bioreduction reactions or gene knock-out, which eliminates the activity of enzymes with conflicting and unwanted stereoselectivities. Commonly used technique is also overexpression of the desired protein or expression of heterologous enzymes in yeast cells.
    Źródło:
    Wiadomości Chemiczne; 2011, 65, 1-2; 93-110
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Hearing Threshold of Employees Exposed to Noise Generated by the Low-Frequency Ultrasonic Welding Devices
    Autorzy:
    Dudarewicz, A.
    Zaborowski, K.
    Rutkowska-Kaczmarek, P.
    Zamojska-Daniszewska, M.
    Śliwińska-Kowalska, M.
    Zamysłowska-Szmytke, E.
    Pawlaczyk-Łuszczyńska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/178077.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise-induced hearing loss
    noise
    ultrasonic noise
    occupational exposure
    Opis:
    The aim of the study was to assess the hearing threshold levels (HTLs) in employees exposed to noise generated by low-frequency ultrasonic technological equipment in comparison with the HTLs of workers exposed to audible noise at the similar A-weighted equivalent-continuous sound pressure level. The study includes measurements of ultrasonic and audible noise at workplaces and hearing tests, i.e. conventional pure-tone audiometry and extended high-frequency audiometry. The study group comprised 90 workers, aged 41.4 ± 10.0 years (mean±SD), exposed for 17.3 ± 9.8 years to noise generated by ultrasonic devices at mean daily noise exposure level (‹LEX,8h›) of 80.6 ± 2.9 dB. The reference group consists of 156 subjects, exposed to industrial noise (without ultrasonic components) at similar A-weighted equivalent-continuous sound pressure level (‹LEX,8h› = 81.8 ± 2.7 dB), adjusted according to age (39.8 ± 7.7 years), gender and job seniority (14.0 ± 7.0 years). This group was selected from database collected in the Nofer Institute of Occupational Medicine. Audiometric hearing threshold levels in the frequency range of 0.5–6 kHz were similar in both groups, but in the frequency range of 8–12.5 kHz they were higher in the group of employees exposed to ultrasonic noise. The findings suggest that differences in the hearing threshold (at high frequencies) in analyzed groups may be due to differences in spectral composition of noise and show the need to continue the undertaken studies.
    Źródło:
    Archives of Acoustics; 2017, 42, 2; 199-205
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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