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Wyszukujesz frazę "Klimowicz, L." wg kryterium: Wszystkie pola


Wyświetlanie 1-5 z 5
Tytuł:
Antioxidant potential of Hippophae rhamnoides L. extracts obtained with green extraction technique
Autorzy:
Muzykiewicz, A.
Zielonka- Brzezicka, J.
Klimowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/72070.pdf
Data publikacji:
2018
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Opis:
Introduction: Antioxidants, isolated from different plant parts, are widely used due to their ability to prevent the development of so-called oxidative stress. Sea buckthorn (Hippophae rhamnoides L.) is one of the plants with expected antioxidant properties. Objective: The aim of the study was to evaluate the antioxidant activity of ethanolic, methanolic and acetonic extracts of H. rhamnoides leaves, ripe and unripe fruits obtained by ultrasound-assisted extraction. Methods: To estimate the antioxidant potential of the extracts the DPPH, FRAP, ABTS and Folin-Ciocalteu methods were applied. Moreover, the influence of the extrahent, as well as extraction time, on this activity was evaluated. Results: Sea buckthorn leaf extracts showed higher activity, contrary to the fruit extracts. Moreover, higher activity of ripe fruit extracts compared to unripe material extracts was found. To obtain the highest content of antioxidants in the extracts, ultrasound-assisted extraction for 60 min with methanol should be applied. Conclusions: The presented in vitro results could lead to the conclusion that H. rhamnoides seems to be a valuable source of antioxidants to be applied in various branches of industry.
Źródło:
Herba Polonica; 2018, 64, 4
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of antioxidant activity of extracts of hop leaves harvested in different years
Autorzy:
Muzykiewicz, Anna
Nowak, Anna
Zielonka-Brzezicka, Joanna
Florkowska, Katarzyna
Duchnik, Wiktoria
Klimowicz, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2048759.pdf
Data publikacji:
2019
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
Humulus lupulus L.
DPPH
Folin-Ciocalteu method
FRAP
antioxidants
ultrasoundassisted extraction
metoda Folin-Ciocalteu
antyoksydanty
ekstrakcja wspomagana ultradźwiękami
Opis:
Introduction: Hop (Humulus lupulus L.) is a common plant in Europe, with many beneficial health effects. In addition to the use in brewing, hops are a valuable source of active substances used in conventional and folk medicine, such as humulones and lupulones, as well as antioxidants, including phenolic compounds. Objective: The aim of the study was to evaluate and compare the antioxidant activity of alcoholic extracts of fresh hop leaves collected in 2017 and 2018. Material and methods: The raw material consisting of fresh hop leaves was extracted using ultrasoundassisted extraction. Methyl, ethyl and isopropyl alcohol at three concentrations were used as extractants. The antioxidant activity of extracts was determined using DPPH and FRAP methods. Total phenolic content was evaluated using the Folin-Ciocalteu technique. Results: All the extracts showed antioxidant potential as well as the phenolic content. Regardless of the harvesting year and methods of evaluation, the highest antioxidant activity and the total polyphenol content were observed for extracts prepared in undiluted methanol, obtained during one hour lasting extraction. Conclusion: The results of the studies have suggested that hop leaves can be a potential source of healthpromoting antioxidants.
Źródło:
Herba Polonica; 2019, 65, 3; 1-9
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antibodies to parainfluenza virus type 3 in goat population in Poland
Autorzy:
Moroz, A.
Czopowicz, M.
Mickiewicz, M.
Witkowski, L.
Szaluś-Jordanow, O.
Nalbert, T.
Klimowicz-Bodys, M.D.
Markowska-Daniel, I.
Bagnicka, E.
Kaba, J.
Powiązania:
https://bibliotekanauki.pl/articles/2087164.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
caprine arthritis-encephalitis
CAE
goats
parainfluenza
PIV-3
respiratory disease
small ruminant lentivirus
SRLV
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 2; 235-241
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Open extensive IoT research and measurement infrastructure for remote collection and automatic analysis of environmental data
Autorzy:
Wiszniewski, Ł.
Klimowicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/1940556.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska
Tematy:
Internet of Things
LoRaWAN
data gathering
data visualization
unmanned air vehicles
LPWAN Network
Long Range Data Transmission
internet rzeczy
gromadzenie danych
wizualizacja danych
bezzałogowe pojazdy powietrzne
sieć LPWAN
transmisja danych dalekiego zasięgu
Opis:
Internet of Things devices that send small amounts of data do not need high bit rates as it is the range that is more crucial for them. The use of popular, unlicensed 2.4 GHz and 5 GHz bands is fairly legally enforced (transmission power above power limits cannot be increased). In addition, waves of this length are very difficult to propagate under field conditions ( e.g. in urban areas). The market response to these needs are the LPWAN (Low Power WAN) type networks, whose main features are far-reaching wireless coverage and low power measurement end-nodes that can be battery powered for months. One of the promising LPWAN technologies is the LoRa WAN, which uses a publicly available 868 MHz band (in Europe) and has a range of up to 20 km. This article presents how the LoRa WAN network works and describes the installation of the research and measurement infrastructure in this technology which was built in the Gdańsk area using the Academic Computer Center TASK network infrastructure. The methodology and results of the qualitative and performance studies of the constructed network with the use of unmanned aircraft equipped with measuring devices for remote collection of environmental data are also presented. The LoRaWAN TASK has been designed to support the development of other research projects as an access infrastructure for a variety of devices. Registered users can attach their own devices that send specific metrics that are then collected in a cloud-based database, analyzed and visualized.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 4; 355-363
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of green-extraction technique to evaluate of antioxidative capacity of wild population of fireweed (Epilobium angustifolium)
Autorzy:
Nowak, A.
Klimowicz, A.
Duchnik, W.
Kucharski, Ł.
Florkowska, K.
Muzykiewicz, A.
Wira, D.
Zielonka-Brzezicka, J.
Siedłowska, A.
Nadarzewska, K.
Powiązania:
https://bibliotekanauki.pl/articles/2048950.pdf
Data publikacji:
2019
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
Epilobium angustifolium
antioxidant activity
total polyphenol content
green-extraction technique
total flavonoid content
aktywność antyoksydacyjna
ogólna zawartość polifenoli
ogólna zawartość flawonoidów
zielona metoda ekstrakcji
Opis:
Introduction: Fireweed (Epilobium angustifolium (L.) Holub) is a common weed growing on meadows, roadside and agricultural wasteland, creating vast, rapidly spreading fields. Objective: The aim of the study was to evaluate the antioxidant activity of extracts from fresh fireweed, harvested at three ripening stages. Methods: Analysis of antioxidative activity was carried out by DPPH, ABTS and FRAP methods. Total polyphenol and total flavonoid content were also determined. Plant material was extracted using ultrasound-assisted green extraction technique with methanol, ethanol and isopropanol at different concentrations and water. Results: The highest antioxidant activity evaluated by DPPH, ABTS and FRAP was found for the extracts prepared in 70% ethanol. The highest content of total polyphenols were observed in extracts in 70% ethanol, whereas the highest content of flavonoids extracts in undiluted methanol. Conclusion: Epilobium angustifolium harvested at fruit ripening stage seems to be a valuable source of antioxidants.
Źródło:
Herba Polonica; 2019, 65, 4; 18-30
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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