Temat: carboxylate - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: RFLP analysis of 1-aminocyclopropane-1-carboxylate synthase ACC2 and ACC4 genes from Polish cultivars of tomato.
Autorzy:: Jakubowicz, Małgorzata
Jółkowska, Justyna
Kwapiszewska, Grażyna
Kręcisz, Anna
Czerski, Piotr
Powiązania:: https://bibliotekanauki.pl/articles/1043712.pdf
Data publikacji:: 2002
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: 1-aminocyclopropane-1-carboxylate synthase
Opis:: An important trait of tomato is the rate of fruit ripening, strongly dependent on ethylene production. The ripening-related ethylene synthesis in tomato is controlled mainly by 1-aminocyclopropane-1-carboxylate synthase LE-ACS2 and LE-ACS4 isoenzymes (Rottmann et al., 1991, J. Mol. Biol. 222: 937; Lincoln et al., 1993, J. Biol. Chem. 268: 19422; Barry et al., 2000, Plant Physiol. 123: 979). In spite of numerous reports on the LE-ACS2 and LE-ACS4 gene expression, only ones considered the genomic organisation each of these genes (Rottmann et al., 1991; Lincoln et al., 1993) reported one copy of each of these genes in tomato cv VF36. In this article we suggest that the genomic organisation of LE-ACS2 and LE-ACSS4 genes may depend on tomato cultivars and may differ from that described by the above authors. The results of Southern analyses of genomic DNAs from 17-day old seedlings (cultivars Jaga, Halicz, Betalux, New Yorker) imply that the genomic organisation of LE-ACS2 and LE-ACS4 genes in Polish cultivars differs from that reported for cv VF36.
Źródło:: Acta Biochimica Polonica; 2002, 49, 4; 1037-1042
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of addition of a mixture of manganese and iron carboxylate on the degradation process of LDPE films
Wpływ dodatku mieszaniny karboksylanów manganu i żelaza na proces degradacji folii PE-LD
Autorzy:: Cichy, B.
Kużdżał, E.
Nowak, M.
Turkowska, M.
Gibas, E.
Rymarz, G.
Powiązania:: https://bibliotekanauki.pl/articles/278557.pdf
Data publikacji:: 2016
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:: pro-degradant additives
LDPE film
manganese carboxylate
iron carboxylate
prodegradanty
folie PE-LD
karboksylan manganu
karboksylan żelaza
Opis:: A study was made of the degradation of polyethylene packaging film modified with Mn(II) and Fe(III) carboxylate at additive content of 0.5 and 1 wt%. A comparison was made between the effectiveness of manganese and iron carboxylate at molar ratio of Mn: Fe 1.5 and the photodegradative effects of mixed carboxylate salts of these metals of various content of the individual fatty acids. We compared the effects of degradation of films obtained under the same processing variables and aged under the same conditions. In this way we have studied the effect of chemical composition of the carboxylates on their effectiveness and the usefulness of technical grade stearin in obtaining an effective and thermally durable prodegradant.
Przedstawiono wyniki badań degradacji opakowaniowej folii polietylenowej modyfikowanej karboksylanami Mn(II) i Fe(III) przy zawartości tego dodatku w polimerze 0.5 i 1% mas. Porównano skuteczność karboksylanu manganu i żelaza o stosunku molowym Mn:Fe 1.5 na działanie fotodegradacyjne mieszanych soli karboksylowych tych metali o różnym składzie indywidualnych kwasów tłuszczowych. Porównano efekty degradacji folii uzyskanych w tych samych warunkach przetwórstwa i poddawanych starzeniu. Badano wpływ składu chemicznego karboksylanów na ich skuteczność oraz przydatność stearyny technicznej do uzyskania skutecznego i termicznie trwałego prodegradanta.
Źródło:: Przetwórstwo Tworzyw; 2016, T. 22, Nr 5 (173), 5 (173); 400-406
1429-0472
Pojawia się w:: Przetwórstwo Tworzyw
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Structure, catalytic activity and evolutionary relationships of 1-aminocyclopropane-1-carboxylate synthase, the key enzyme of ethylene synthesis in higher plants.
Autorzy:: Jakubowicz, Małgorzata
Powiązania:: https://bibliotekanauki.pl/articles/1043746.pdf
Data publikacji:: 2002
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: ethylene synthesis
1-aminocyclopropane-1-carboxylate synthase
Opis:: Both ethylene and the enzymes of ethylene synthesis are subjects of intensive scientific investigation. The present review discusses structure, catalytic activity and evolutionary relationships of 1-aminocyclopropane-1-carboxylate synthase, identified for the first time in ripening tomato in 1979. This enzyme is responsible for the conversion of S-adenosyl-L-methionine to 1-aminocyclopropane-1-carboxylic acid, which is the key step of ethylene synthesis in higher plants. The role of this enzyme (especially in the fruit ripening) was demonstrated in 1991 in transgenic tomato plants, expressing 1-aminocyclopropane-1-carboxylate synthase antisense RNA. On the basis of mutagenesis and crystallization of the enzyme, new data were provided on the three-dimensional structure and amino-acid residues which are critical for catalysis. The control of ethylene production is of great interest for plant biotechnology because it can delay senescence and overmaturation. These processes are responsible for large loss of vegetables and fruit on storage. Detailed structural and biochemical data are necessary to help design 1-aminocyclopropane-1-carboxylate synthase inhibitors, whose application is expected to have immense agricultural effects.
Źródło:: Acta Biochimica Polonica; 2002, 49, 3; 757-774
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: SCMNPs@Uridine/Zn: An efficient and reusable heterogeneous nanocatalyst for the rapid one-pot synthesis of tricyclic fused pyrazolopyranopyrimidine and 3-methyl carboxylate substituted pyrano[2,3-c]pyrazole derivatives under solvent-free conditions
Autorzy:: Wei, Jia
Gui, Wenjun
Cui, Yanjun
Zhang, Zhifang
Yousif, Qahtan A.
Powiązania:: https://bibliotekanauki.pl/articles/778587.pdf
Data publikacji:: 2020
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: nanocatalyst
synthesis of tricyclic
carboxylate
efficient heterogeneous
Opis:: SCMNPs@Uridine/Zn is utilized as an environmental-friendly and efficient heterogeneous nanocatalyst for two one-pot four-component condensation reactions, containing hydrazine hydrate, arylaldehyde, ethyl acetoacetate, and barbituric acid to yield tricyclic fused pyrazolopyranopyrimidine derivatives (5a-q), and hydrazine hydrate, arylaldehyde, malononitrile, and dimethyl acetylenedicarboxylate/diethyl acetylenedicarboxylate to yield 3-methyl carboxylate substituted pyrano[2,3-c]pyrazole derivatives (8a-y) under solvent-free conditions with high to excellent yields. The main advantages of this process are easy work-up, short reaction times, no chromatographic purifications, and recyclability of the catalyst for a minimum of six runs without any signifcant decrease in yields of the products. Also, the prepared catalyst SCMNPs@Uridine/Zn was synthesized and fully characterized by various techniques including Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray (EDX), thermogravimetric analysis (TGA), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and Raman spectroscopy.
Źródło:: Polish Journal of Chemical Technology; 2020, 22, 2; 20-33
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Seepage process on weathered crust elution-deposited rare earth ores with ammonium carboxylate solution
Autorzy:: Zou, Hualiang
Zhang, Zhenyue
Chen, Zhuo
Liu, Defeng
Chai, Xiuwei
Zhang, Han
Chi, Ru-an
Powiązania:: https://bibliotekanauki.pl/articles/1449672.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: permeability
weathered crust elution-deposited rare earth ore
ammonium carboxylate
hydrodynamics
Opis:: In order to reveal the seepage law of ammonium carboxylate solution in the in-situ leaching process of weathered crust elution-deposited rare earth ores, the effects of concentration, pH, temperature, particle size and porosity on permeability were discussed in this paper. The results shown that the seepage of the leaching agent solutions in the rare earth ore follows Darcy's law and displays a laminar flow under the conditions of this experiment and seepage velocity can be increased by changing leaching conditions. The permeability coefficients are inversely proportional to concentrations of ammonium acetate, ammonium tartrate and ammonium citrate whose concentration is greater than 0.7wt%, because the insoluble complexes formed by the reaction of ammonium citrate with RE3+ at lower concentration n decrease the permeability coefficient. The permeability coefficients of ammonium carboxylate solutions increase firstly and then decrease with the pH increased. The maximum of permeability coefficients of ammonium acetate, ammonium tartrate and ammonium citrate solution were 2.92, 1.91 and 2.70, respectively, while the pH of solution were 5, 6 and 7, respectively. Increasing temperature is beneficial for the seepage of ammonium carboxylate solution in orebody, therefore, it is helpful for leaching operation in summer. Moreover, clay minerals particle size and porosity are the key factors affecting the permeability of ammonium carboxylate solution in orebody. The permeability coefficients of ammonium acetate, ammonium tartrate and ammonium citrate solutions are 2.92×104cm/s,1.90×10-4cm/s and 2.69×10-4cm/s, respectively, at the same temperature of 293K, original particle size and porosity of the ore. Ammonium acetate solution has the best permeability in orebody.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 1; 89-101
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Acetylation of methyl 5-amino-1H-[1,2,4]triazole-3-carboxylate
Autorzy:: Dżygiel, Anetta
MAsiukiewicz, Elżbieta
Rzeszotarska, Barbara
Powiązania:: https://bibliotekanauki.pl/articles/1044073.pdf
Data publikacji:: 2001
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: hetareneamino acid
5-amino-1H-[1,2,4]triazole-3-carboxylate
Opis:: Acetylation with acetic anhydride of methyl 5-amino-1H-[1,2,4]triazole-3-carboxylate, one of the hetareneamino acids, was studied using HPLC,1H NMR, FTIR and GC-MS. The compound has a significantly decreased susceptibility to acetylation compared to 5-amino-1H-[1,2,4]triazole itself. Two isomeric diacetylated products were found.
Źródło:: Acta Biochimica Polonica; 2001, 48, 4; 1169-1173
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Rheological behavior of polymer-based drilling fluids: experimental study of temperature effects
Autorzy:: Safi, Brahim
Aboutaleb, Djamila
Haider, Soumya
Powiązania:: https://bibliotekanauki.pl/articles/45423959.pdf
Data publikacji:: 2023
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: polimery
naprężenie
lepkość
reologia
polymers
methylcellulose carboxylate
drilling fluid
shear stress
viscosity
rheological behavior
Opis:: Drilling fluids most commonly used are generally based on polymers. Polymers such as methylcellulose carboxylate (CMC), polyanionic cellulose (PAC) and xanthan (Xn) have a very important role in the success of drilling operations. Indeed, they are also used to improve certain properties, in particular rheological. However, these polymers can lose their characteristics under the influence of increasing temperature at the bottom of oil wells, thus affecting the ability of the mud to perform its useful role in the drilling operation, namely to raise the cuttings from the bottom of the well to the surface. The present work aims to study the effect of temperature on the main rheological properties (shear stress and plastic viscosity) as well as on the rheological behavior of water-based drilling muds (WBM). WBM_CMC and WBM_PAC (at Xn content fixed) were selected to evaluate the temperature effect (20°C; 40°C; 60°C and 80°C) on the rheological parameters and the rheological behavior. The results revealed that the shear stress and the plastic viscosity of the studied muds were considerably affected by an increase in temperature. A significant decrease in these drilling mud parameters as a function of temperature up to 80°C. A reduction of 58.8% in shear stress and 78.5% in plastic viscosity was observed. The results show that regardless of the test temperature, the shear thinning behavior of the WBM_CMC and WBM_PAC drilling muds is the same as the Herschel-Bulkley model.
Źródło:: International Journal of Applied Mechanics and Engineering; 2023, 28, 1; 95-104
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Application of chromatographic plate theory on the weathered crust elution-deposited rare earth ore with carboxylate
Autorzy:: Zhang, Zhenyue
Wang, Guangshuai
Li, Chunhua
Chi, Ruan
Long, Fei
Chen, Zhuo
Chi, Xiao Wang
Liu, Defeng
Powiązania:: https://bibliotekanauki.pl/articles/1446022.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: weathered crust elution-deposited rare earth ore
carboxylate ammonium
mass transfer
theory plate
rare earth
Opis:: To improve the leaching process of rare earth and reduce the impurities in the leachate, the carboxylate ammonium, such as ammonium acetate, ammonium citrate and ammonium tartrate, were selected as lixiviant to compare the effects of concentration, flow rate, pH and temperature on leaching mass process of rare earth and aluminum. Meanwhile, the leaching behaviors of rare earth and aluminum leached by three kinds of carboxylate ammonium were analyzed by chromatographic plate theory. The relationship between the flow rate and height equivalent (HETP) could fit well with the Van Deemter equation and there was an optimal flow rate (uopt) for the leaching of the rare earth and aluminum. Besides, the conditions of carboxylate ammonium lixiviant were optimized. The optimum concentrations of ammonium acetate, ammonium tartrate and ammonium citrate were 15 g/L, 25 g/L and 5 g/L respectively, the leaching flow rate was 0.50 mL/min, the pH value was approximatively 7.00 and the leaching temperature was 293 K to 303 K. At these conditions, the mass transfer efficiencies of three ammonium carboxylates for rare earth and aluminum was in the order of ammonium acetate > ammonium tartrate > ammonium citrate. Moreover, the ammonium acetate could commendably inhibit aluminum ions entering the lixivium.
Źródło:: Physicochemical Problems of Mineral Processing; 2021, 57, 4; 48-62
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Stress-tolerant antagonistic rhizobacteria isolated from the medicinal plant Tinospora cordifolia
Autorzy:: Vyas, P.
Kaur, A.
Powiązania:: https://bibliotekanauki.pl/articles/80127.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: medicinal plant
Tinospora cordifolia
stress tolerance
rhizobacteria
auxin production
1-amino-cyclopropane-1-carboxylate synthase
antagonism
phosphate solubilization
hydrogen cyanide
Źródło:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 2
0860-7796
Pojawia się w:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:: Biblioteka Nauki