Temat: acid - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Model radioisotope experiments on the influence of acid rain on 65Zn binding with humic acid
Autorzy:: Koczorowska, E.
Mieloch, M.
Slawinski, J.
Powiązania:: https://bibliotekanauki.pl/articles/147092.pdf
Data publikacji:: 2002
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: acid rain
complexation
humic acid
sulphuric acid
zinc
Opis:: Acid rain formed first of all from sulphur oxide emitted by natural and anthropogenic sources, may change the biological equilibrium and the metal stoppage in the soil. The model experiments were performed to determine the influence of acid rain on zinc bond with humic acid (HA). The samples were prepared in glass columns with quartz sand and overlaid HA or HA+65Zn radioisotope that simulates natural conditions. Then, solutions of H2SO4 were introduced into the sand HA layer. Zinc was washed with diluted (10 4 10 3 M) sulphuric acid as the simulation of acid rain. The recovery of injected radiotracer ions in eluates was found to depend on pH of simulated acid rain. The results help to evaluate the migration behaviour of zinc in the presence of HA and H2SO4. The model studies illustrate the considerable influence of sulphuric acid on chemical degradation of HA.
Źródło:: Nukleonika; 2002, 47, 4; 167-171
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A note on distribution of human plasma levels of ascorbic and dehydroascorbic acid
Autorzy:: Capellmann, M
Becka, M.
Bolt, H.M.
Powiązania:: https://bibliotekanauki.pl/articles/70840.pdf
Data publikacji:: 1994
Wydawca:: Polskie Towarzystwo Fizjologiczne
Tematy:: ascorbic acid
plasma
dehydroascorbic acid
ascorbic acid concentration
Źródło:: Journal of Physiology and Pharmacology; 1994, 45, 1
0867-5910
Pojawia się w:: Journal of Physiology and Pharmacology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Natural phenolic acids may increase serum estradiol level in ovariectomized rats
Autorzy:: Zych, Maria
Folwarczna, Joanna
Trzeciak, Henryk
Powiązania:: https://bibliotekanauki.pl/articles/1040548.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: rat
estradiol
p-coumaric acid
chlorogenic acid
body mass
caffeic acid
ferulic acid
Opis:: Natural phenolic acids are commonly present in plants consumed in the diet. Recently we have observed that different natural phenolic acids exert differential effects on the body mass gain in ovariectomized and non-ovariectomized female rats. The aim of the present study was to investigate the effects of ferulic, caffeic, p-coumaric and chlorogenic acids on serum estradiol and total cholesterol levels in ovariectomized and non-ovariectomized rats. The experiments were carried out on 3-month old female Wistar Cmd:(WI)WU rats, divided into following groups (n=8 in each group): non-ovariectomized control rats and non-ovariectomized rats receiving ferulic, caffeic, p-coumaric or chlorogenic acids, sham-operated control rats, ovariectomized control rats and ovariectomized rats receiving the same phenolic acids. The phenolic acids were administered at a dose of 10 mg/kg p.o. daily for 4 weeks. Serum estradiol and total cholesterol levels on the next day after the last administration of the phenolic acids were examined. The phenolic acids did not affect serum estradiol or total cholesterol levels in non-ovariectomized rats. In ovariectomized rats, caffeic acid and to a lesser extent p-coumaric acid increased serum estradiol level, which effect correlated with a decreased body mass gain. All the phenolic acids decreased serum cholesterol level in ovariectomized rats. Concluding, the anti-obesity activity of some phenolic acids may be, at least partially, connected with estrogenic pathways.
Źródło:: Acta Biochimica Polonica; 2009, 56, 3; 503-507
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Seasonal proximate and fatty acid variations of some seaweeds from the Northeastern Mediterranean coast
Autorzy:: Polat, S.
Ozogul, Y.
Powiązania:: https://bibliotekanauki.pl/articles/48220.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: fatty acid
seaweed
Mediterranean coastal zone
nutritional value
macroalga
protein content
gas chromatography
eicosapentaenoic acid
docosahexaenoic acid
essential fatty acid
fatty acid methyl ester
polyunsaturated fatty acid
fatty acid profile
seasonal variation
Źródło:: Oceanologia; 2013, 55, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Oil content and composition in seeds of Camelina sativa and Crambe abyssinica cultivars
Autorzy:: Marsalkiene, N.
Zilenaite, L.
Karpaviciene, B.
Powiązania:: https://bibliotekanauki.pl/articles/1192479.pdf
Data publikacji:: 2020
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:: oil composition
glucosinolate
fatty acid
erucic acid
linolenic acid
Opis:: The aim of the study was to evaluate seed oil content and oil composition in five Camelina sativa and four Crambe abyssinica cultivars as an interaction of a genotype and the climatic conditions in Lithuania. The studied species differed in the seed oil content, glucosinolate content in oil and oil fatty acid composition. The oil content was 22.1-42.5% in dry matter of camelina seeds and 23.4-36.6% in crambe seeds. The glucosinolate content varied from 61.8 to 68.6 µmol g-1 in oil of crambe, and from 8.6 to 30.5 µmol g-1 in oil of camelina. The oil content in seeds and glucosinolate content in oil of each species differed between the research years but not between the cultivars. The glucosinolate content in oil correlated significantly with the oil content in dry matter of seeds. However, this correlation was negative for camelina (rs=-0.59, p=0.045) and positive for crambe (rs=0.86, p=0.007). Camelina oil was characterised by the dominance of linolenic acid (34.8-41.6%), while crambe oil was predominated by erucic acid (53.0-60.9%). The second most abundant fatty acid in oil of both species was oleic acid, whose amount did not differ between the species. At the same time, the content of all other studied fatty acids differed significantly between both species. Our study indicated that variation in seed oil content, glucosinolate content and fatty acid composition in each studied species was much less affected by inheritable features of cultivars than by meteorological conditions in the research years.
Źródło:: Journal of Elementology; 2020, 25, 4; 1399-1412
1644-2296
Pojawia się w:: Journal of Elementology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Kinetics and reaction pathways of total acid number reduction of cyclopentane carboxylic acid using subcritical methanol
Autorzy:: Mandal, P. C.
Nagarajan, T.
Powiązania:: https://bibliotekanauki.pl/articles/777903.pdf
Data publikacji:: 2016
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: cyclopentane carboxylic acid
subcritical methanol
total acid number
naphthenic acid
activation energy
Opis:: Cyclopentane carboxylic acid (CPCA) is a model compound of Naphthenic acids (NAs). This objective of this paper is to discover total acid number (TAN) reduction kinetics and pathways of the reaction between CAPA and subcritical methanol (SubC-MeOH). The experiments were carried out in an autoclave reactor at temperatures of 180-220°C, a methanol partial pressure (MPP) of 3 MPa, reaction times of 0-30 min and CPCA initial gas phase concentrations of 0.016-0.04 g/mL. TAN content of the samples were analyzed using ASTM D 974 techniques. The reaction products were identified and quantified with the help of GC/MS and GC-FID respectively. Experimental results reveal that TAN removal kinetics followed first order kinetics with an activation energy of 13.97 kcal/mol and a pre-exponential factor of 174.21 s^-1. Subcritical methanol is able to reduce TAN of CPCA decomposing CPCA into new compounds such as cyclopentane, formaldehyde, methyl acetate and 3-pentanol.
Źródło:: Polish Journal of Chemical Technology; 2016, 18, 3; 44-49
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Variability of fatty acid composition in seed oil of winter rapeseed (Brassica napus L.) developed through mutagenesis
Zmiany składu kwasów tłuszczowych w nasionach rzepaku ozimego (Brassica napus L.) uzyskane na drodze mutagenezy
Autorzy:: Spasibionek, S.
Powiązania:: https://bibliotekanauki.pl/articles/833214.pdf
Data publikacji:: 2008
Wydawca:: Instytut Hodowli i Aklimatyzacji Roślin
Tematy:: variability
fatty acid composition
seed oil
winter rapeseed
rapeseed
Brassica napus
mutagenesis
chemical mutagenesis
fatty acid
oleic acid
linoleic acid
linolenic acid
desaturation
Źródło:: Rośliny Oleiste - Oilseed Crops; 2008, 29, 2
1233-8273
Pojawia się w:: Rośliny Oleiste - Oilseed Crops
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Microemulsions as Carriers of Omega-3 Polyunsaturated Fatty Acids
Mikroemulsje jako nośniki kwasów tłuszczowych omega-3
Autorzy:: GÓRSKA, Anna
KRUPA, Anna
Powiązania:: https://bibliotekanauki.pl/articles/1033822.pdf
Data publikacji:: 2013
Wydawca:: Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
Tematy:: docosahexaenoic acid (DHA)
eicosapentaenoic acid (EPA)
functional foods
microemulsions
microencapsulation
α-linolenic acid
Opis:: Design of novel foodstuffs rich in natural bioactive substances is one of the main research field in the food industry. There are many clinical reports on beneficial effects of either docosahexaenoic acid (DHA) or eicosapentaenoic acid (EPA) on health. In general n-3 polyunsaturated fatty acids (n-3 PUFAs) are significant structural components of cell membranes. Since DHA and EPA represent exogenous fatty acids, their level in the human body depends on the dietary intake. Therefore there is a need to enrich food by bioactive compounds. It has been shown that the application of polyunsaturated fatty acids such as α-linolenic acid in traditional foodstuffs permits to obtain a kind of functional food that can be used to improve both health and skin condition. However low stability of natural bioactive components limits their application in food, especially on an industrial scale. Due to this fact efforts are made to prepare new functional food formula containing n-3 PUFAs in a stable form. Microencapsulation process is a well known attempt to prevent their oxidation. Preparation of food-grade microemulsions containing polyunsaturated fatty acids to improve the stability and to ensure pleasant sensory properties of food is discussed in the present study.
Źródło:: Medicina Internacia Revuo; 2013, 25, 101; 211- 219
0465-5435
Pojawia się w:: Medicina Internacia Revuo
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The effect of oleic and linoleic acid addition to the culture media on bovine embryonic development following vitrification
Autorzy:: Karaşahin, T.
Powiązania:: https://bibliotekanauki.pl/articles/2087426.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: embryo
linoleic acid
oleic acid
vitrification
Źródło:: Polish Journal of Veterinary Sciences; 2019, 4; 661-666
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki