Search results for "GC"
showing 10 items of 606 documents
Synthesis and characterization of ethylene-1-hexene copolymers prepared by using MgCl2(THF)2-supported Ziegler-Natta catalysts
2000
Ethylene was copolymerized with 1-hexene over vanadium (VOCl3 and VCl4) and titanium (TiCl4) catalysts supported on MgCl2(THF)2 and activated with Et2AlCl. So far these catalyst systems have not been known as initiators of ethylene-1-hexene copolymerization. The vanadium catalysts were more active than the titanium catalyst and, at identical comonomer concentrations in the feed, gave rise to a greater incorporation of 1-hexene into the copolymer. Even at relatively low fractions of 1-hexene, the MgCl2(THF)2-supported catalysts affected much the copolymer properties like density, melting point and crystallinity.
Garnet as a monitor for melt–rock interaction: Textural, mineralogical, and compositional evidence of partial melting and melt‐driven metasomatism
2021
International audience; In this study, we focus on a partially melted garnet-bearing granulite from the Salvador–Esplanade Belt (Salvador da Bahia, Brazil), and examine the behaviour of major and trace elements during partial melting and melt-driven metasomatism. Phase equilibria modelling and U–Th– Pb geochronology show that the sample underwent partial melting during the heating segment of the decompression path from ~1.2 GPa and 675–700° C to ~0.8 GPa and 790°C at c. 2.06 Ga. During the final stage of decompression, from 0.8 to ~0.5 GPa, physical segregation of melt resulted in the establishment of chemical potential gradients and mass transfer between the host granulite and the leucosom…
Tra AGCM e ABF il Collegio Coordinamento sceglie il non liquet
2023
L’autore analizza la figura dell’arbitro bancario finanziario, il quale pur non essendo né un giudice né un arbitro, è chiamato in una certa misura a comportarsi “come se fosse tale”, ossia a decidere, secondo diritto, sulla domanda proposta dal cliente. Si sofferma, pertanto, sul principio espresso dal Collegio di Coordinamento dell’ABF con la pronuncia n.2460/2023 in materia di rapporti tra provvedimento sanzionatorio dell’AGCM, in materie diverse dagli illeciti “anti-trust”, disciplinati dal d.lgs. 3/2017. Conclude che, qualora l’accertamento dell’AGCM non sia ancora definitivo, l’arbitro bancario finanziario, come a fortiori il giudice, resta libero di accertare autonomamente la condott…
MODY izraisošo mutāciju detektēšana, izmantojot eksomu sekvenēšanu
2015
MODY (Maturity Onset Diabetes of the Young) ir monogēnā cukura diabēta veids, kam raksturīga autosomāli dominanta pārmantošana un simptomu izpausme pirms 25 gadu vecuma. Mutācija kādā no trim gēniem – HNF1α, HNF4α un GCK, sastāda 70-80% MODY gadījumu, tomēr pastāv vēl vismaz 10 gēni, kuros radušās mutācijas spēj izraisīt MODY simptomus. Bakalaura darba mērķis ir detektēt MODY izraisošās mutācijas, izmantojot eksomu sekvenēšanu. Eksomu sekvenēšana tika veikta 11 pacientiem no trim ģimenēm. Vienā no ģimenēm tika atrasta jauna mutācija HNF1α, kas ir tikai ģimenes locekļiem ar MODY un noteikta kā slimību izraisoša, tādējādi apstiprinot diagnozi MODY3. Bakalaura darbs tika izstrādāts Latvijas Bi…
Evaluation of Mycotoxin Residues on Ready-to-Eat Food by Chromatographic Methods Coupled to Mass Spectrometry in Tandem
2018
Simultaneous determination of twenty-seven mycotoxins in ready-to-eat food samples using &ldquo
A New Solution for Sea Wave Energy Harvesting, the Proposal of an Ironless Linear Generator
2020
The paper investigates an innovative ironless linear generator, installable inside a wave energy converter, in order to produce electricity from sea waves. This energy source is considered strategic for the future, especially in small islands
Partition of volatile compounds in pea globulin–maltodextrin aqueous two-phase system
2014
International audience; This study is based on the assumption that the off-flavour of pea proteins might be decreased using the retention of volatile compounds by a mixture with another biopolymer. The partition of volatile compounds in an aqueous system containing pea protein and maltodextrins was followed under thermodynamic incompatibility conditions. Firstly, the phase diagram of the system was established. Then, the partition of aroma compounds between the phase rich in protein and the phase rich in maltodextrin was measured by SPME–GC–MS. There was a transfer of volatile compounds during phase separation. Variations of pH were also used to vary the retention of volatile compounds by p…
Chemical characterization of Anthemis parlatoreana fresh and dried aerial parts by GC and LC chromatographic techniques and evaluation of the antioxi…
2022
Anthemis parlatoreana was collected in the north west coast of Sicily. Fresh and dried aerial parts were subjected to distillation procedure for the extraction and isolation of essential oils. In both fresh and dried samples, the most abundant chemical classes were ketones and esters, represented to a greater extent by β-thujone and β-artemisia acetate, respectively. In dried vegetable material, a high content of α-pinene and δ3-carene was also registered. Aqueous, methanol and ethyl acetate extracts of aerial parts were also investigated in terms of polyphenolic content and antioxidant potential. All the extracts tested showed a quite different quali-quantitative profile and in terms of ch…
Remarks on strange-quark simulations with Wilson fermions
2020
Physical review / D 102(7), 074506 (1-10) (2020). doi:10.1103/PhysRevD.102.074506
Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric sour…
1996
Os, Sr, Nd, Pb and O isotopes and trace element data are reported for basaltic andesite and andesite whole rocks and, in part, for selected mineral separates from the Jurassic Ferrar flood basalt province. Radiogenic Sr (> 0.709), unradiogenic Nd (εNd= −3 to −5), and radiogenic Pb isotopes, as well as low Nb/La ratios of 0.4 – 0.6 and Nb/La ratios between 0.45 and 0.6 are found for all rocks including our most primitive sample (Mg# = 71.9). This indicates involvement of either continental crust or enriched lithospheric mantle in magma genesis. 187Re/188Os correlates strongly with 187Os/188Os, with an age of 172 ± 5 Ma, in agreement with published Arsingle bondAr data. Initial 187Os/188Os of…