Search results for "hapot"
showing 10 items of 106 documents
Advanced biorefinery concepts related to non-wood feedstocks
2018
Agricultural residues, such as wheat straw (Triticum aestivum), okra stalk (Abelmoschus esculentus), and giant miscanthus (Miscanthus × giganteus, a hybrid of M. sinensis and M. sacchariflorus) were investigated to assess their possible consumption for integrated lignocellulosic biorefining. The efficient fractionation and recovery of all important chemical components (cellulose, hemicelluloses, and lignin) of such feedstocks are a prerequisite for realistic biorefinery concepts. Water is one of the most eco-friendly solvents with the highest potential for industrial use, and it is also suitable for full-scale biorefinery purposes. For example, under pressure at elevated temperatures over 1…
Traceless chirality transfer from a norbornene β-amino acid to pyrimido[2,1-a]isoindole enantiomers
2017
The synthesis of two enantiomeric pairs of pyrimidoisoindoles 9a, 9b and 10a, 10b is reported. During a domino ring-closure reaction, followed by cycloreversion, the chirality of diendo-(−)-(1R,2S,3R,4S)-3-aminobicyclo[2.2.1]hept-5-ene-2-carboxamide [(−)-1] was successfully transfered to heterocycles (+)-9a, (+)-10a, (−)-9b, (−)-10b and (−)-10c. peerReviewed
Selective gas adsorption by calixarene-based porous octahedral M32 coordination cages
2022
Giant octahedral M32 coordination cages were prepared via self-assembly of sulfonylcalix[4]arene-supported tetranuclear M(II) clusters (M = Co, Ni) with hybrid linker based on tris(dipyrrinato)cobalt(III) complexes appended with peripherical carboxylic groups. Due to intrinsic and extrinsic porosity, the obtained solid-state supramolecular architectures demonstrated good performance as adsorbents for the separation of industrially important gases mixtures. peerReviewed
Matrix Isolation FTIR and Theoretical Study of Weakly Bound Complexes of Isocyanic Acid with Nitrogen.
2021
Weak complexes of isocyanic acid (HNCO) with nitrogen were studied computationally employing MP2, B2PLYPD3 and B3LYPD3 methods and experimentally by FTIR matrix isolation technique. The results show that HNCO interacts specifically with N2. For the 1:1 stoichiometry, three stable minima were located on the potential energy surface. The most stable of them involves a weak, almost linear hydrogen bond from the NH group of the acid molecule to nitrogen molecule lone pair. Two other structures are bound by van der Waals interactions of N⋯N and C⋯N types. The 1:2 and 2:1 HNCO complexes with nitrogen were computationally tracked as well. Similar types of interactions as in the 1:1 complexes were …
Complexes of Glycolic Acid with Nitrogen Isolated in Argon Matrices. II : Vibrational Overtone Excitations
2019
Structural changes of glycolic acid (GA) complex with nitrogen induced by selective overtone excitation of the νOH mode were followed in argon matrices using FTIR spectroscopy. For the most stable SSC1 complex present in different trapping sites directly upon deposition site, selective changes in the νOH region were achieved upon near-infrared irradiation. Simultaneously, new conformers of the GA…N2 complex were formed, giving rise to several sets of bands in the νOH and νC=O regions of the spectra. Both position and intensity of new absorptions appeared to be highly sensitive on the wavelength of radiation used, as well as on the annealing of the matrix. Based on theoretical calculations a…
Complexes of Glycolic Acid with Nitrogen Isolated in Argon Matrices. I : Structures and Thermal Effects
2019
Molecular complexes between glycolic acid and nitrogen were studied in a low-temperature argon matrix with FTIR spectroscopy, and supported by MP2 and BLYPD3 calculations. The calculations indicate 11 and 10 stable complex structures at the MP2 and BLYPD3 levels of theories, respectively. However, only one hydrogen-bonded complex structure involving the most stable SSC conformer of glycolic acid was found experimentally, where the nitrogen molecule is bound with the carboxylic OH group of the SSC conformer. The complex shows a rich site structure variation upon deposition of the matrix in different temperatures and upon annealing experiments, which provide interesting prospects for site-sel…
Amino acid metabolism in athletes and non-athletes : with special reference to amino acid concentrations and protein balance in exercise, training an…
2002
Hannu Pitkänen tutki väitöskirjassaan fyysisen harjoituksen, pitkän harjoitusjakson ja ikääntymisen aiheuttamia vaikutuksia elimistön aminohappo- ja proteiiniaineenvaihduntaan. Ihmisen elämälle välttämätön ravintoaine, proteiini (valkuaisaine), jota on noin 15 % kehon painosta, koostuu aminohapoista. Välttämättömät aminohapot on saatava ravinnosta, kun taas ei-välttämättömiä aminohappoja voidaan tuottaa elimistössä. Vain noin 0.5-1.0 % aminohapoista on vapaana veressä ja lihaksen sisällä ns. vapaana aminohappoaltaana. Aminohappoja tulee altaaseen ravinnosta, kudoksiin sidotun proteiinin hajoamisesta ja hiilihydraatti- ja rasva-aineenvaihdunnan välituotteita siirtämällä kehon sisällä veren v…
Suun kautta nautitun arginiinin vaikutukset plasman arginiinipitoisuuteen levossa ja voimaharjoituksen yhteydessä
2005
Tutkimuksen tarkoituksena oli selvittää arginiini- tai plasebotablettien suun kautta nauttimisen jälkeen plasmasta mitattua arginiinin määrää kaksoissokkotutkimuksella levon ja voimaharjoituksen yhteydessä. Yksittäisten aminohappojen imeytymistä ruuansulatuskanavasta verenkiertoon ei ole juurikaan tutkittu, vaikka arginiinin vaikutuksista elimistöön löytyy lukuisia tutkimuksia. Koehenkilöinä oli yhdeksän miestä (ikä 27±3 vuotta, paino 78±10 kg ja pituus 1.80±0.07 m). Kaksoissokkokokeessa yön paaston jälkeen kaikki koehenkilöt nauttivat suun kautta joko levossa tai voimaharjoituksen yhteydessä eri mittauskerroilla plasebotabletteja tai arginiinitabletteja 50 mg/painokilo. Kaikilla mittausker…
Plasman aminohappopitoisuuksien muutokset nautittaessa suun kautta glutamiinia ja arginiinia levon ja voimaharjoituksen yhteydessä
2006
Leikas, Anne 2006. Plasman aminohappopitoisuuksien muutokset nautittaessa suun kautta glutamiinia ja arginiinia levon ja voimaharjoituksen yhteydessä. Liikuntafysiologian pro-gradu –tutkielma. Liikuntabiologian laitos. Jyväskylän yliopisto. 154 s. Tutkimuksen tarkoituksena oli selvittää suun kautta nautitun glutamiinin ja arginiinin vaikutuksia plasman aminohappopitoisuuksiin. Tutkimus toteutettiin kaksoissokkotutkimuksella levon ja voimaharjoituksen yhteydessä. Yksittäisten aminohappojen imeytymisen arvioimista ruuansulatuskanavasta verenkiertoon kuormituksen yhteydessä ei ole juurikaan tehty, vaikka aminohappojen vaikutuksista elimistöön on lukuisia tutkimuksia. Tutkimuksen mittaukset tot…
Protein purification of Agrobacterium tumefaciens phytochrome Agp1 and UV-vis spectroscopy analysis in comparison to DrBphP from Deinococcus Radiodur…
2015
Phytochromes are bimodal light switchable photosensors exist in plants, bacteria and fungi. Incorporating bilin as their chromophore, most bacteriophytochromes (BphPs) function as two-component histidine kinase affected by red/far-red light and regulate downstream physiological activities in the microorganism. The study aims on the purification of Agrobacterium phytochrome Agp1whose phosphorylation activity in its histidine kinase (HK) domain was recently found to be affected by the temperature. The purified proteins Agp1 were assembled with biliverdin IXα (BV) and monitored by UV-vis spectroscopy with BV incorporated DrBphP from Deinococcus radiodurans. Extinction coefficient spectra of “a…