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Wyświetlanie 1-15 z 2693
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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Chitosan dichloro acetic acid salts
Autorzy:
Wojtasz-Pająk, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1035503.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
dichloroacetic acid.
Opis:
The salts of dichloroacetic acid were obtained from chitosans of different deacetylation degrees (69÷97%) and viscosity-average molecular weights (61÷327 kDa). The mole ratio of dichloroacetic acid to amine groups was 1. The chemical and physical properties of the salts were evaluated by determining the dry weight, the content of ash, acid, insoluble substances, kinematic viscosity, and pH. The studied salts had a low contents of water (<10%), inorganic pollutants (<0.2%), and a low insoluble substances fraction (<0.15%). The determined acid content was similar to the theoretical content. The physical properties of the chitosan influenced the kinematic viscosity of the salt solutions. The kinematic viscosity decreased when the viscosity-average molecular weights of the chitosan decreased. The properties of chitosan did not significantly impact the pH of the salt solutions. This depended on the pKa of the acid. The chemical and physical properties of the salts can be altered by neutralizing the dichloroacetate solutions to a pH at which no distinct change in clarity occurs.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 55-62
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Acid Rider. Idea „komunizmu kwasowego” Marka Fishera a doświadczenie zewnętrzności
Acid Rider. Mark Fisher’s Idea of “Acid Communism” and Experience of Outerness
Autorzy:
Karalus, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/15603071.pdf
Data publikacji:
2021-07-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
acid communism
eeriness
Outside
accelerationism
komunizm kwasowy
niesamowitość
Zewnętrze
akceleracjonizm
Opis:
Acid communism pozostaje intrygującym wstępem Marka Fishera do planowanej przezeń historycznej rekonstrukcji radykalnych projektów politycznych wyrosłych na gruncie kultury psychodelicznej. Idea ta nie narodziła się w próżni, lecz stanowi konsekwencję jego poszukiwań teoretycznych. Artykuł próbuje osadzić koncepcję „komunizmu kwasowego” w szerszym kontekście, skupiając się na refleksji poświęconej doświadczeniu psychodelicznemu jako kontakcie z Zewnętrzem. Twierdzę, że istnieje zbieżność między koncepcją komunizmu kwasowego a zagadnieniami poruszanym przez Fishera w książce The Weird And The Eerie, gdzie analizuje potencjalnie transformujący szok zetknięcia z tym, co radykalnie Inne. Omówię przy tym krótko dwa fenomeny muzyczno-kulturowe, które zaistniały już po epoce psychodelii lat sześćdziesiątych. Posłużą one za egzemplifikacje trybów weird oraz eerie, obietnic przyszłości pokapitalistycznej, które nie znalazły politycznej reprezentacji i osunęły się na poziom widma niezrealizowanej przyszłości modernizmu. W końcowej części artykułu spróbuje pokazać jak zagadnienie komunizmu kwasowego wiąże się z kwestią pragnienia postkapitalistycznego oraz z Fisherowską wersją futuro-akceleracjonizmu.
Acid Communism remains an intriguing but regrettably unfinished introductory sketch to the Mark Fisher’s unwritten historical reconstruction of those radical political projects which grew up out of the psychedelic culture. This compelling idea is a consequence of Fisher’s prior theoretical endeavours. The article attempts to embed his idea of “acid communism” in a broader context, focusing on Fisher’s reflection on psychedelic experience, defined as a form of contact with the Outside. I argue that there is a striking convergence between the conception of “acid communism” and matters discussed by Fisher in his last book, The Weird and the Eerie, where he analyzed potentially transformative shock of an encounter with radical Otherness. For that reason I will address briefly two musical and cultural phenomena which came into being after the psychedelic era and use them as exemplifications of the “weird” and “eerie” modes of experience, unfulfilled promises of post-capitalist future, which did not find political representation and sank to the level of unrealized and “haunted” future of modernism. In the concluding part of my article I would show how the idea of “acid communism” is tied to the question regarding the so called post-capitalist desire and to the Fisher’s idiosyncratic version of futurist-accelerationism.
Źródło:
Praktyka Teoretyczna; 2021, 40, 2; 37-57
2081-8130
Pojawia się w:
Praktyka Teoretyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Jiroft refractory manganese ore leaching using oxalic acid as reducing agent in sulfuric acid solution
Autorzy:
Sobouti, Arash
Shafaat, Niosha
Abdollahzadeh, Ali A.
Powiązania:
https://bibliotekanauki.pl/articles/110395.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
manganese
oxalic acid
sulfuric acid
leaching
optimization
Jiroft
Opis:
Leaching process of Jiroft refractory manganese ore was investigated. The effects of operating parameters such as liquid to solid ratio, pulp temperature, sulfuric acid concentration, and oxalic acid concentration were studied and the optimization was done through the response surface methodology (RSM) based on central composite design (CCD) model. The recoveries of Mn, Fe and Si were selected as response of design. The optimum condition was determined by ANOVA, indicating that the liquid to solid ratio, oxalic acid concentration and pulp temperature for Mn recovery and liquid to solid ratio, pulp temperature and sulfuric acid concentration for Fe recovery and liquid to solid ratio for Si recovery were the most effective parameters, respectively. Under the optimum conditions of liquid to solid ratio= 11.8%, pulp temperature= 700 C, sulfuric acid concentration= 40 g/L and oxalic acid concentration= 35 g/L, 71.1%, 4.67% and 0.6% of Mn, Fe and Si were recovered, respectively.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 2; 374-385
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of diphenylphosphinic acid esters
Autorzy:
Korzeniowska, Ewelina
Powiązania:
https://bibliotekanauki.pl/articles/763978.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
diphenylphosphinic acid esters, substitution reaction
Opis:
The development of new methods for the synthesis of organophosphorus compounds is still an important part of organic chemistry due to the high demand for these compounds in organic synthesis as well as in asymmetric catalysis. Most of the methods for the synthesis of these compounds include the reactivity of the phosphorus atom, which depending on the structure might exhibit both electrophilic and nucleophilic properties. Herein, I will present the results concerning synthesis of diphenylphosphinic acid esters.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2017, 72, 1
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing cyclohexyl hydroxamic acid and benzohydroxamic acid in cassiterite flotation under lead nitrate activation
Autorzy:
Yang, Hao
Ou, Leming
Powiązania:
https://bibliotekanauki.pl/articles/27323645.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
cassiterite
flotation
lead nitrate
cyclohexyl hydroxamic acid
Opis:
This paper investigates the flotation behavior of Cyclohexyl hydroxamic acid (CHA) and benzhydroxamic acid (BHA) on cassiterite under lead nitrate activation conditions and elucidates the adsorption mechanism of CHA on the cassiterite surface. Microflotation experiments were performed to compare the capturing efficiency of CHA and BHA at pH values ranging from 4 to 12. Results showed that CHA exhibited superior capability in capturing cassiterite compared to BHA. The recovery of cassiterite in the hydroxamic acid-based flotation system correlated positively with the adsorption of hydroxamic acid on the cassiterite surface. Adsorption experiments revealed an increase in adsorption quantity with an increase in hydroxamic acid dosage, with CHA exhibiting significantly higher adsorption amount than BHA on the cassiterite surface. To analyze the adsorption mechanism of CHA on the cassiterite surface, both infrared spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis were conducted, both before and after lead nitrate activation. IR spectra and XPS results indicated that lead ion activation enhanced the adsorption of CHA on the cassiterite surface, resulting in an increased number of active sites for CHA interaction. Additionally, chemisorption of CHA occurred on the cassiterite surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174673
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trans-arachidonic acids: new mediators of inflammation
Autorzy:
Balazy, M.
Powiązania:
https://bibliotekanauki.pl/articles/69394.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
arachidonic acid
lipid
uric acid
protein
dairy fat
inflammation
fatty acid
free radical
DNA
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 4,1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of kinetics and mechanism of priceite leaching in sulphuric acid solutions
Autorzy:
Gur, A.
Powiązania:
https://bibliotekanauki.pl/articles/110631.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
boron minerals
priceite
sulphuric acid
leaching kinetics
boric acid
Opis:
The leaching kinetics and mechanism of priceite having the formula of 4CaO5B2O37H2O was investigated in sulphuric acid solutions. For the dissolution process, the effects of reaction temperature, sulphuric acid solution concentration, solid/liquid ratio, particle size, and stirring speed were investigated as effective parameters for the experiments. The experimental data indicated that the dissolution rate increased with the increasing reaction temperature, the decreasing particle size, and the solid/liquid ratio. The conversion rate increased up to 1.0 mol/dm3 with the increasing acid concentration, and then decreased with the increasing acid concentration over concentrations of 1 mol/dm3. It was also determined that the stirring speed had no significant effect on the dissolution rate. The dissolution process of priceite in sulphuric acid solution was tested with regard to heterogeneous and homogeneous reaction models, and it was found that the dissolution rate was controlled by first order pseudo-homogeneous reaction model. The activation energy of the dissolution process was determined as 26.07 kJmol-1. The results were evaluated graphically and statistically. The experimental data were found to fit well with the mathematical model.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 719-730
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of Testing the Penetration of Acid Solutions Through Safety Gloves
Autorzy:
Liwkowicz, J.
Kowalska, J.
Powiązania:
https://bibliotekanauki.pl/articles/89778.pdf
Data publikacji:
2000
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
chemical gloves
safety gloves
acid permeation
acid resistance
rękawice
rękawice ochronne
kwasy
Opis:
Because they cause burns that are difficult to heal, acids are dangerous, and steps should be taken to ensure that the human skin does not come into contact with them. For this purpose safety gloves are generally used by workers who have to handle acids. Such gloves need to be tested to ensure that they are acid resistant. Standard EN 374 (European Committee for Standardization [CEN], 1993c) specifies a method of testing the permeation of liquid chemicals, on a molecular level, through glove material, but it may be difficult to ensure the fitness of the joints of a 4wo-compartment cell, when gloves are lined with jersey. To deal with this a simple pH-meter method to test the permeation of acid and alkali solutions through safety gloves has been developed. The permeation of H2S 0 4, HCI, HN03, and CH3COOH through gloves made from neoprene, nitrile, and PVC was tested. This method seems to be simple and economical.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2000, 6, 1; 81-88
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 2693

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