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81.
Pradeep Kumar Kamila Asit Ray Ambika Sahoo Sanghamitra Nayak Pradipta Kumar Mohapatra 《Natural product research》2018,32(19):2352-2355
Physicochemical characteristics and fatty acid composition of Lasiococca comberi Haines (Euphorbiaceae), an endangered forest tree species, were determined for the first time. The oil, protein, crude fibre and carbohydrate contents in seeds were 41.5, 13.8, 22.2 and 11.6%, respectively. The refractive index, pH, specific gravity, saponification value, iodine value, peroxide value and p-anisidine value of seed oil were 1.4781, 6.4, 0.9, 178.4 mg KOH/g, 196 g I2/100 g of oil, 5.1 mEq O2/kg and 188.4, respectively. The predominant fatty acids were linolenic acid (65.3%), oleic acid (13.8%), linoleic acid (7.1%) and palmitic acid (5.3%). HPLC analysis revealed the presence of α-tocopherol (13.2 mg/100 g) and γ-tocopherol (6.3 mg/100 g) as the major tocopherols. The results indicated that L. comberi seed oil can be classified as drying oil having possible applications in different industries and as an important dietary source of omega-3 fatty acids. 相似文献
82.
Agnieszka Łupicka-Słowik Mateusz Psurski Renata Grzywa Kamila Bobrek Patrycja Smok Maciej Walczak Andrzej Gaweł Tadeusz Stefaniak Józef Oleksyszyn Marcin Sieńczyk 《Applied biochemistry and biotechnology》2018,184(4):1358-1374
Adenosine deaminase (ADA) is currently used as a diagnostic marker for tuberculous pleuritis. Although ADA has been suggested as a potential marker for several types of cancer, the importance of each of ADA isoforms as well as their levels and enzymatic activities in tumors need to be further investigated. Herein we developed avian immunoglobulin Y highly specific to human ADA via hens immunization with calf adenosine deaminase. The obtained antibodies were used for the development of a sensitive double-egg yolk immunoglobulin (IgY) sandwich ELISA assay with an ADA detection limit of 0.5 ng/ml and a linearity range of up to 10 ng/ml. Specific, affinity-purified IgYs were able to recognize human recombinant ADA and ADA present in human cancer cell lines. In addition, antigen-specific IgY antibodies were able to inhibit catalytic activity of calf ADA with an IC50 value of 47.48 nM. We showed that generated IgY antibodies may be useful for ADA detection, thus acting as a diagnostic agent in immunoenzymatic assays. 相似文献
83.
Experimental and Theoretical DFT Study on Synthesis of Sterically Crowded 2,3,3,(4)5‐Tetrasubstituted‐4‐nitroisoxazolidines via 1,3‐Dipolar Cycloaddition Reactions Between Ketonitrones and Conjugated Nitroalkenes
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Radomir Jasiński Kamila Mróz Agnieszka Kącka 《Journal of heterocyclic chemistry》2016,53(5):1424-1429
1,3‐Dipolar cycloaddition reactions between ketonitrones ( 1a , 1b , 1c , 1d , 1e ) and β‐substituted nitroalkenes ( 2a , 2b , 2c , 2d ) proceed under mild conditions, with complete regioselectivity, and lead with high yields to sterically crowded 2,3,3,5‐tetrasubstituted‐4‐nitroisoxazolidines ( 3a , 3b , 3c , 3d , 3e , 3f ). Reaction course may be interpreted on the basis of nature of local, nucleophile–electrophile interactions. Moreover, density functional theory (DFT) simulations of reaction paths suggest that these reactions should be considered as polar, “one‐step two‐stage” cycloadditions. Subsequently, it has been found that similar reactions between ketonitrones and α‐substituted nitroalkenes do not allow to obtain the expected 2,3,3,4‐tetrasubstituted‐4‐nitroisoxazolidines. 相似文献
84.
Ray Asit Jena Sudipta Sahoo Ambika Kamila Pradeep Kumar Nayak Sanghamitra Panda Pratap Chandra 《Chemistry of Natural Compounds》2021,57(6):1150-1152
Chemistry of Natural Compounds - 相似文献
85.
Kamila Saasiska Maciej Celiski Kamila Mizera Mateusz Barczewski Pawe Kozikowski Micha K. Leszczyski Agata Domaska 《Molecules (Basel, Switzerland)》2021,26(4)
In this paper, the fire behavior of unsaturated polyester resin (UP) modified with L-histidinium dihydrogen phosphate-phosphoric acid (LHP), being a novel intumescent fire retardant (IFR), was investigated. Thermal and thermomechanical properties of the UP with different amounts of LHP (from 10 to 30 wt. %) were determined by thermogravimetric analysis (TG) as well as dynamic mechanical thermal analysis (DMTA). Reaction to small flames was studied by horizontal burning (HB) test, while fire behavior and smoke emission were investigated with the cone calorimeter (CC) and smoke density chamber. Further, the analysis of volatile products was conducted (TGA/FT-IR). It was observed that the addition of LHP resulted in the formation of carbonaceous char inhibiting the thermal decomposition, burning rate and smoke emission. The most promising results were obtained for the UP containing 30 wt. % of LHP, for which the highest reduction in maximum values of heat release rate (200 kW/m2) and total smoke release (3535 m2/m2) compared to unmodified polymer (792 kW/m2 and 6895 m2/m2) were recorded. However, some important disadvantage with respect to water resistance was observed. 相似文献
86.
Kamila Bendová 《Archive for Mathematical Logic》2001,40(1):19-23
Even if the ordering of all natural number is (known to be) not definable from multiplication of natural numbers and ordering
of primes, there is a simple axiom system in the language such that the multiplicative structure of positive integers has a unique expansion by a linear order coinciding with the
standard order for primes and satisfying the axioms – namely the standard one.
Received: 3 December 1998 相似文献
87.
Ekaterina М. Zueva Мaria М. Petrova Aliia V. Shamsieva Kamila R. Trigulova Elvira I. Musina Robert R. Fayzullin Artem S. Bogomyakov Victor I. Ovcharenko Andrey A. Karasik 《International journal of quantum chemistry》2020,120(8):e26145
A combination of experimental (SQUID magnetometry) and quantum-chemical (BS-DFT, CASSCF(n,m)/NEVPT2, DDCI3) methods is used to probe the influence of terminal ligands on magnetic exchange coupling in the series of [Cu2(μ2-OAc)4L2] complexes with O-donor terminal ligands extended by two novel complexes containing phosphine oxide ligands. The possibilities and limitations of these approaches are discussed. The influence of terminal ligands on magnetic superexchange interaction was quantified by two contributions—the first contribution is associated with structural changes within the {Cu(μ2-OAc)4Cu} core, while the second contribution is due to the difference in the electronic influence of different terminal ligands at a given core geometry. Both contributions were found to be approximately of the same order of magnitude. These results indicate that magnetic exchange coupling, known to be highly sensitive to the distortions in core geometry, is not solely determined by the core structure. Our findings are consistent with the fact that various one- and multiparameter magnetostructural correlations reported in the literature have only a qualitative predictive capability. 相似文献
88.
Agata G?uszyńska Kamila Bajor Izabella Czerwińska Dominika Kalet Bernard Juskowiak 《Tetrahedron letters》2010,51(41):5415-5418
Two new ligands based on anthracene or carbazole planar skeletons, and a phenyloxazoline moiety linked by a vinyl bridge are synthesized as potential DNA-interacting drugs. Their spectral characteristics and DNA binding affinity are assessed. 相似文献
89.
Kamila Šťastná Vít Fiala Jan John 《Journal of Radioanalytical and Nuclear Chemistry》2010,286(3):735-739
Because of the energy loss of α-particles by self-absorption, α-spectrometry requires thin, uniform, and nearly weightless
samples. Several methods exist for sample preparation, e.g., electrodeposition or co-precipitation. Unfortunately, the methods
yielding the best energy resolution are not always quantitative and are usually relatively demanding and time-consuming. This
fact makes application of α-spectrometry for screening tests with radiotracers complicated. For its simplicity and fastness,
the possibility to prepare samples for α-spectrometry by direct evaporation of simple aliquots of aqueous or organic solutions
and the influence of the presence of volatile organic diluent or tensioactive agent was investigated. Also, the influence
of coating the samples with Mylar film was evaluated. The sample preparation techniques were compared based on the counting
efficiency and energy resolution achieved. The performance of the selected method was tested on assessment of the efficiency
of americium extraction by BTBP (bis-triazine-bipyridine) extractant. 相似文献
90.
Tomas Cajka Chris Sandy Veronika Bachanova Lucie Drabova Kamila Kalachova Jana Pulkrabova Jana Hajslova 《Analytica chimica acta》2012
In this work, a new rapid method for the determination of 135 pesticide residues in green and black dry tea leaves and stalks employing gas chromatography coupled to tandem mass spectrometry (GC–MS/MS) with a triple quadrupole was developed and validated. A substantial simplification of sample processing prior to the quantification step was achieved: after addition of water to a homogenised sample, transfer of analytes into an acetonitrile layer was aided by the addition of inorganic salts. Bulk co-extracts, contained in the crude organic extract obtained by partition, were subsequently removed by liquid–liquid extraction using hexane with the assistance of added 20% (w/w) aqueous NaCl solution. The importance of matrix hydration prior to the extraction for achieving good recoveries was demonstrated on tea samples with incurred pesticide residues. For most of the analytes, recoveries in the acceptable range of 70–120% and repeatabilities (relative standard deviations, RSDs) ≤20% were achieved for both matrices at spiking levels of 0.01, 0.1 and 1 mg kg−1. Under optimised GC–MS/MS conditions, most of the analytes gave lowest calibration level ≤0.01 mg kg−1, permitting the control at the maximum residue levels (MRLs) laid down in Regulation (EC) No 396/2005. The developed method was successfully applied to the determination of pesticide residues in real tea samples. 相似文献