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Wyświetlanie 1-8 z 8
Tytuł:
In vitro shoot cultures of pink rock-rose (Cistus x incanus L.) as a potential source of phenolic compounds
Autorzy:
Kubica, P.
Szopa, A.
Ekiert, H.
Powiązania:
https://bibliotekanauki.pl/articles/58731.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
In vitro cultures of Cistus ×incanus (pink rock-rose) were maintained on two variants of Murashige and Skoog (MS) medium differing in terms of composition of plant growth regulators (PGRs): 6-benzyladenine (BA) and 1-naphthaleneacetic acid (NAA) at the following concentrations: 3 mg/L and 0, 3 mg/L and 1 mg/L, respectively, and on a variant without PGRs – a control. Cultures were maintained in a form of agar and agitated shoot cultures. The qualitative and quantitative analyzes of three groups of phenolic compounds (catechins, flavonoids, and free phenolic acids) were performed by using the HPLC-DAD technique in methanolic extracts of in vitro biomasses and of commercial plant raw material. In analyzed extracts from in vitro cultures, the presence of catechin [max. 197.80 mg / 100 g dry weight (DW)], epicatechin gallate (max. 30.74 mg / 100 g DW), gallic acid (max. 83.23 mg / 100 g DW), quercetin (max. 10.15 mg / 100 g DW), and quercitrin (max. 72.89 mg / 100 g DW) was confirmed. The quantities of accumulated compounds varied and depended on the type of in vitro culture and the concentration of PGRs in media. The highest amounts of all estimated compounds were obtained in biomasses from agar cultures cultivated on medium without PGRs in vitro. In extracts obtained from commercial raw material, gallic acid (max. 261.80 mg / 100 g DW) and quercetin (max. 255.96 mg / 100 g DW) were detected as being the dominant compounds.
Źródło:
Acta Societatis Botanicorum Poloniae; 2017, 86, 4
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and anticancer activity evaluation of novel derivatives of 7-amino-4-methylquinolin-2(1H)-one
Autorzy:
Kubica, Krzysztof P.
Taciak, Przemyslaw P.
Czajkowska, Agnieszka
Sztokfisz-Ignasiak, Alicja
Wyrebiak, Rafal
Mlynarczuk-Bialy, Izabela
Malejczyk, Jacek
Mazurek, Aleksander P.
Powiązania:
https://bibliotekanauki.pl/articles/895717.pdf
Data publikacji:
2018-08-31
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
anticancer activity
cytotoxicity assay
cell migration assay
quinolin-2(1H)-one
Opis:
In this study we designed and synthesized sixteen new derivatives of 7-amino-4-methylquinolin-2(1H)-one with potential anticancer activity. The structures of synthesized compounds were confirmed by 1H and 13C NMR. The activity of novel substances was evaluated by cell viability assay and wound healing assay. In vitro tests for series of sixteen novel compounds were performed. The results showed that examined compounds are selective for cancer cells, but their activity for various types of cancer is different. Three of new compounds presented ability to inhibit cells migration. The novel compounds constitute a good starting point for further studies and optimization of structure for new therapeutically effective anti-cancerous drugs. Seven compounds, which showed the highest rate of cell inhibition, were selected for further studies.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 4; 903-910
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and anticancer activity evaluation of some new derivatives of 2-(4-benzoyl-1-piperazinyl)-quinoline and 2-(4-cinnamoyl-1-piperazinyl)-quinoline.
Autorzy:
Kubica, Krzysztof P.
Taciak, Przemyslaw P.
Czajkowska, Agnieszka
Sztokfisz-Ignasiak, Alicja
Wyrebiak, Rafal
Podsadni, Piotr
Mlynarczuk-Bialy, Izabela
Malejczyk, Jacek
Mazurek, Aleksander P.
Powiązania:
https://bibliotekanauki.pl/articles/895388.pdf
Data publikacji:
2018-08-31
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
anticancer activity
cytotoxicity assay
2-quinoline
cell migration assay
Opis:
In this study we designed and synthesized twenty new derivatives of 2-(4-benzoyl-1-piperazinyl)-quinoline and 2-(4-cinnamoyl-1-piperazinyl)-quinoline with potential anticancer activity. The structures of synthesized compounds were confirmed by 1H and 13C NMR spectroscopy and MS spectrometry. The activity of novel compounds was evaluated in the cell viability assay as well as in the wound healing assay. Presented data show that examined substances have anticancer activity in cell culture. Seven compounds which showed a high rate of cell growth inhibition were selected for further studies. Three of them strongly reduced growth of B16F10 cells. The novel compounds constitute a good base for further studies and optimization of structure for new therapeutically effective anti-cancerous drugs.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 4; 891-901
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of ignition timing advance on the CNG natural gas combustion in SI engine
Autorzy:
Flekiewicz, M.
Kubica, G.
Fabiś, P.
Powiązania:
https://bibliotekanauki.pl/articles/241679.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
CNG passenger car engine
combustion analysis
ignition advance
Opis:
A significant reduction of CO2 emission in the road transport is a major challenge for next years. In the combination with efficient powertrain technologies, the potential of natural gas is excellent for comparably light and cost effective reduction of CO2 and toxic emission in the future [1-2]. As the CNG fuelling stations in Poland are not so far widespread enough to make a dedicated natural gas vehicle practical, it results necessary to start with proposing alternatively CNG powered engines. Such a bi-fuel automotive engines are necessary to bridge the gap between petrol and natural gas. As a sample of modern engine design an Opel 1.6 litre 4-cylinder engine has been selected as a base of powertrain for development of bi-fuelpassenger car engine. The influence of ignition timing on CNG combustion process has been presented in this paper. A 1.6 litre SI engine has been tested in the special program. For selected engine operating conditions, following data were acquired: in cylinder pressure, crank angle, fuel mass consumption and exhaust gases temperatures. For the settings of 6, 9, 12 and 15 deg crank angle timing advance correction, the internal temperature of combustion chamber has been estimated, as well as the charge combustion ratio and ratio of heat release were tested. With the help of the mathematical model, emissions of NO, CO and CO2 were additionally estimated. Obtained results made it possible to compare the influence of ignition timing advance on natural gas combustion in SI engine.
Źródło:
Journal of KONES; 2008, 15, 4; 123-131
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diacryloyl Derivative of Mannitol - Synthesis and Application in Gelcasting of Al2O3-ZrO2 Composites
Autorzy:
Wiecinska, P.
Kubica, D.
Pietrzak, E.
Sakowicz, A.
Prokurat, N.
Antosik, A.
Powiązania:
https://bibliotekanauki.pl/articles/356943.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gelcasting
ZTA
composites
zirconia
mannitol
Opis:
The aim of research was the elaboration of the synthesis of new organic monomer applicable in gelcasting. The substance named 3,4-di-acryloyl-D-mannitol which contains two acryloyl groups and four hydroxyl groups in its molecule has been synthesized. The monomer has been then applied in the preparation of Al2O3-ZrO2 composites by gelcasting and subsequent sintering. Rheological properties of ceramic suspensions have been examined, as well as the properties of green and sintered bodies. SEM observations allowed to determine the distribution of zirconia grains in alumina matrix. Density, Vickers hardness and fracture toughness of ZTA composites have been measured. The new monomer, that is diacryloyl derivative of mannitol, is less sensitive to the oxygen inhibition than commonly used in gelcasting and commercially available 2-hydroxyethyl acrylate.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 859-865
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The possibilities of using DME (BioDME), as an additive to conventional gaseous fuels in SI engine
Autorzy:
Flekiewicz, M.
Kubica, G.
Marzec, P.
Powiązania:
https://bibliotekanauki.pl/articles/133969.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
dimethyl ether
DME+LPG
fuel blend
SI engine
eter dimetylowy
mieszanina paliw
silnik ZI
Opis:
The results of SI engine fueled with blends of LPG and DME are presented in the paper. The range studies submitted includes measurements at varying engine loads, at selected values of speed. The research was conducted on a chassis dynamometer, specifying the engine load by the degree of throttle opening. Value of the mass fraction of DME in the blend with LPG was determined based on previous analyzes. The selected fuel blends containing from 7 to 17% DME (mass fraction). During the study was also performed a series of comparative measurements with pure LPG. Analyses show that of DME can be used as a partial substitute for LPG in SI engines. Its presence does not a negative impact on performance and emissions of the engine. The obtained results indicate that the amount of addition of DME should be varied depending on the engine load. Moreover, the use of this fuel does not require changes to the design fueling system and storage of LPG.
Źródło:
Combustion Engines; 2017, 56, 4; 150-155
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exercise thermoregulation in Thai and Polish male subjects
Autorzy:
Tyka, A
Kubica, R.
Zuchowicz, A.
Szygula, Z.
Golab, S.
Czubala, M.
Cherdrungsi, P.
Powiązania:
https://bibliotekanauki.pl/articles/69354.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
body temperature
rectal temperature
human physiology
physical exercise
Thai male
body weight
thermoregulation
warm environment
acclimatization
Polish male
Źródło:
Journal of Physiology and Pharmacology; 1995, 46, 2
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depositional environment of Paleogen amber-bearing quartz-glauconite sands from Zdolbuniv (Rivne region, NW Ukraine): mineralogical and petrological evidences
Środowisko depozycji paleogeńskich kwarcowo-glaukonitowych piasków bursztynonośnych z kopalni Zdolbuniv (obwód rowieński, NW Ukraina) w świetle badań mineralogiczno-petrologicznych
Autorzy:
Natkaniec-Nowak, L.
Dumańska-Słowik, M.
Naglik, B.
Melnychuk, V.
Krynickaya, M. B.
Smoliński, W.
Sikorska-Jaworowska, M.
Stach, P.
Kubica, D.
Ładoń, K.
Powiązania:
https://bibliotekanauki.pl/articles/216007.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
amber bearing sand
Rivne region
Zdolbuniv town
Ukraine
piasek bursztynonośny
obwód Równe
miasto Zdolbuniv
Ukraina
Opis:
Amber-bearing sands from Zdolbuniv mine are Paleogene fine-grained (0.6–0.12 mm) clastic rocks. The material is poorly rounded and moderately sorted out. It mainly consists of quartz, glauconite, and subordinately, feldspars (K-feldspars and plagioclases), mica, carbonates, zircon, epidote, fossil resins (Baltic amber) and ore minerals such as hematite, rutile, anatase, ilmenite. The presence of glauconite in the sands proves that sedimentation basin had to be marine reservoir. The variable composition of individual glauconite grains suggests the environmental conditions had to change during the sedimentation of clastic rocks. The occurrence of minerals, assembly such as zircon, epidote, ilmenite, rutile, anatase in the sands as well as the brown CL color of quartz grains, may suggest that majority of clastic material originated from metamorphic rocks, most probably coming from the Ukrainian Shield. Together with metamorphic material the fragment of fossil resins, i.e. Baltic amber, from the Paleogene off-shore forests could be transported to the sedimentation basin. Nowadays the bottom part of the analyzed profile is the most promising for the recovery of glauconite, whereas the exploration of Baltic amber may be initiated from the top of the profile.
Piaski bursztynonośne z kopalni Zdolbuniv (obwód rowieński, NW Ukraina) to paleogeńskie, drobnoziarniste (0,6–0,12 mm) skały klastyczne. Materiał ziarnisty tych piasków jest słabo obtoczony i średnio wysortowany. Stanowią go głównie kwarc i glaukonit oraz występujące w podrzędnych ilościach: skalenie (K-skalenie i plagioklazy), miki, węglany, cyrkon, epidot, żywice kopalne (bursztyn) i minerały rudne, takie jak: hematyt, rutyl, anataz, ilmenit. Obecność glaukonitu wskazuje na środowisko morskie sedymentacji tego materiału. Duże zróżnicowanie składu chemicznego poszczególnych osobników glaukonitu sugeruje, że w trakcie sedymentacji materiału ziarnowego dochodziło do zmian warunków środowiskowych w samym basenie. Obecność w przedmiotowych piaskach takich minerałów, jak np. cyrkon, epidot, ilmenit, rutyl, anataz, jak i barwy ziaren kwarcu na obrazach CL wskazują, że większość materiału ziarnowego pochodzi ze skał metamorficznych, najprawdopodobniej budujących podłoże Tarczy Ukraińskiej. Wraz ze wspomnianym materiałem do basenu sedymentacyjnego mogły być transportowane fragmenty paleogeńskiej żywicy (bursztynu), pochodzące z pobliskich lasów. Analizowany profil piasków jest w dolnej części wzbogacony w glaukonit, podczas gdy górna jego część jest wzbogacona we fragmenty żywic kopalnych.
Źródło:
Gospodarka Surowcami Mineralnymi; 2017, 33, 4; 45-62
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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