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Wyszukujesz frazę "Wróbel, Jacek" wg kryterium: Autor


Tytuł:
The challenges of aquaculture in protecting the aquatic ecosystems in the context of climate changes
Autorzy:
Wróbel, Jacek
Gałczyńska, Małgorzata
Tański, Adam
Korzelecka-Orkisz, Agata
Formicki, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/27312664.pdf
Data publikacji:
2023
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
aquaponics
freshwater ecosystem
seawater ecosystem
greenhouse gases
integrated multi-trophic aquaculture
mariculture
pond
recirculating aquaculture system
water temperature
Opis:
The paper discusses the current prognoses of aquaculture development worldwide putting an emphasis on its effect on the environment and the issue of the protection of water reservoirs in different countries. Water consumption in diversified aquaculture systems is presented herein as well as the characteristics of the mechanical and biological water treatment methods in fish farms, with particular attention paid to the recirculating water systems. New aquaculture technologies using post-production waters are presented. The paper provides a discussion on the contribution of aquaculture to the global greenhouse gas emissions and the means of limiting this emission. The effect of climate change on aquatic ecosystems is presented in the context of the changes of the aquaculture production profile. The paper includes a brief presentation of the methods of mitigating the changes with respect to contamination of aquatic ecosystems as well as climate change. Reducing the water footprint can be achieved through selective breeding, species diversification and implementation of more technologically advanced aquaculture systems such as: integrated multi-trophic aquaculture, aquaponics and recirculation systems in aquaculture. The need for certification of fish farms with water recirculation systems is justified in the paper. The issues addressed herein are summarised and the main areas for extending the research promoting preservation of aquatic ecosystems in aquaculture are presented.
Źródło:
Journal of Water and Land Development; 2023, 57; 231--241
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity of Hydrocharis morsus-ranae L. to selected metals and its suitability for phytoremediation of waters contaminated with metals. A mesocosm study
Autorzy:
Gałczyńska, Małgorzata
Wróbel, Jacek
Bednarz, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/2174328.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
biomass
Hydrocharis morsus-ranae
mesocosm study
metals
photosynthetic pigments
phytoremediation
Opis:
Anthropogenic pollution leads to increased concentrations of metals in the freshwater and macrophyte. Aquatic plants substantially contribute to the structure, function as well as and service provision of aquatic ecosystems. Our microcosm experiments were to test the possibility of the physiological response of Hydrocharis morsus-ranae to metal (Cd, Pb, Cu, Zn, Mn, Fe at three level of concentration) contaminated waters. Biomass was analysed at the beginning and at the end of the experiment. At the same time contents of photosynthetic pigments in leaves were estimated spectrophotometrically. We found that this macrophyte had the ability to grow in contaminated waters, but the effects of high concentration of isolated metals in water will indicate changes consisting in the disappearance of a significant part of biological populations were which manifested in alteration of the content of photosynthetic pigments as well as this plant’s growth. We show that generally stress of Zn and Cu influenced the drop of dry biomass which was connected with a positive correlation between the amount of dry biomass and the content of chlorophyll a and carotenoids, or only carotenoids, respectively. The highest stress of Pb and Fe (third concentrations of these metals) also influenced the drop of biomass. We concluded that none of Cd concentrations were toxic to this plant, but the effect of Mn stress was not unequivocal. Moreover, plant growth was stimulated by low Fe concentrations (first concentration) demonstrating the hormesis effect. When plants were exposed to this metal, there was no evidence of damage to the photosynthetic processes.
Źródło:
Journal of Water and Land Development; 2022, 55; 67--77
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semiconductor contact layer characterization in a context of hall effect measurements
Autorzy:
Kowalewski, Andrzej
Wróbel, Jarosław
Boguski, Jacek
Gorczyca, Kinga
Martyniuk, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/220890.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal contact
contact layer
contact resistance
Hall effect
resistivity
van der Pauw method
MSM structure
semiconductors’ characterization
Opis:
A revision of the standard approach to characterization of thin-semiconductor-layer Hall samples has been proposed. Our results show that simple checking of I(V) curve linearity at room temperature might be insufficient for correct determination of bias conditions of a sample before measurements of Hall effect. It is caused by the nonlinear behaviour of electrical contact layers, which should be treated together with the tested layer a priori as a metal-semiconductor-metal (MSM) structure. Our approach was examined with a Be-doped p-type InAs epitaxial layer, with four gold contacts. Despite using full high-quality photolithography a significant asymmetry in maximum differential resistance (Rd) values and positions relative to zero voltage (or current) value was observed for different contacts. This suggests that such characterization should be performed before each high-precision magneto-transport measurement in order to optimize the bias conditions.
Źródło:
Metrology and Measurement Systems; 2019, 26, 1; 109-114
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected physiological parameters of three varieties of basket willow (Salix viminalis L.) from perennial plantations
Wybrane wskaźniki fizjologiczne trzech odmian wierzby wiciowej (Salix viminalis L.) pochodzących z wieloletniej plantacji
Autorzy:
Wróbel, Jacek
Wróbel, Mariola
Powiązania:
https://bibliotekanauki.pl/articles/1811830.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
The aim of the research conducted in 2010-2012 on one-year, two-year and three-year shoots of three verities of Salix viminalis: ‘Bjor’, ‘Jorr’ and ‘Tora’, grown from 14, 15 and 16 year old stumps, was to compare the shoots of different age in terms of selected physiological characteristics, that is the concentration of chloroplast pigments, water balance of leaves and water content and dry matter of shoots. The content of chloroplast pigments (chlorophyll a, chlorophyll b and carotenoids) and the water balance were determined on the basis of RWC-relative water content and WSD-water saturation deficit indicators. Moreover, the water and dry matter content of one-year, two-year and three-year old willow shoots were determined. It was found that the age of the shoots differentiated the physiological parameters of willow varieties. The highest concentration of chlorophylls was reported in the leaves of three-year old shoots of the Bjor variety, in turn the highest concentration of carotenoids was found in the leaves of one-year old shoots of Jorr. Regardless of the age of the shoots, the highest rate of hydration of leaves and stems was a characteristic trait of the Tora variety, and the lowest was found in Jorr. High levels of the measured physiological parameters, such as chlorophyll a and b, carotenoids and relative water content in leaves obtained in the 5th rotation, that is 14th, 15th and 16th year of running the plantation, indicate a high physiological activity and hence high productivity of the studied willow varieties.
Celem badań przeprowadzonych w latach 2010-2012 na jednorocznych, dwui trzyletnich pędach trzech odmian Salix viminalis: Bjor, Jorr i Tora, wyrosłych z 14- 15- i 16-letnich karp, było porównanie różnych wiekowo pędów pod względem wybranych cech fizjologicznych, tj. koncentracji barwników asymilacyjnych i bilansu wodnego liści oraz zawartości wody i suchej masy w pędach. Wykonano oznaczenia zawartości barwników asymilacyjnych w liściach (chlorofil a, chlorofil b i karotenoidy) oraz określono bilans wody w liściach na podstawie wskaźników RWCwzględna zawartość wody i WSD-deficyt wysycenia wodą. Wykonano także oznaczenie zawartości wody i suchej masy w pędach jednorocznych, dwuletnich i trzyletnich badanych odmian wierzby. Na podstawie uzyskanych wyników stwierdzono, że wiek pędów różnicował badane wskaźniki fizjologiczne u odmian wierzby wiciowej. Największą koncentrację barwników chlorofilowych odnotowano w liściach pędów trzyletnich u odmiany Bjor, z kolei karotenoidów w liściach pędów jednorocznych u odmiany Jorr. Spośród badanych odmian, niezależnie od wieku pędów, najwyższym wskaźnikiem uwodnienia liści i pędów charakteryzowała się odmiana Tora, a najmniejszym odmiana Jorr. Wysokie wartości mierzonych wskaźników fizjologicznych tj. chlorofilu a i b, karotenoidów, względnej zawartości wody w liściach uzyskane w 5. rotacji, czyli w 14., 15. i 16. roku prowadzenia plantacji wskazują na wysoką aktywność fizjologiczną, a tym samym na znaczącą produktywność badanych odmian wierzby.
Źródło:
Acta Agrophysica; 2017, 24, 1
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł

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