Search results for "TERMINATION"
showing 10 items of 780 documents
Variability of near-surface saturated hydraulic conductivity for the clay soils of a small Sicilian basin
2019
Abstract Proper characterization of saturated hydraulic conductivity, Ks, of clay soils in a hillslope or a basin is still a challenge for soil science. In this investigation, the clay soils of the Maganoce (Sicily, Italy) basin were sampled at 19 sampling sites by the BEST procedure of soil hydraulic characterization. More OM implied less compact conditions (decreasing dry soil bulk density; coefficient of determination, R2 = 0.67), more stability to water of the soil aggregates (increasing water stable aggregates; R2 = 0.83) and, consequently, higher Ks values (R2 = 0.54). Variability of Ks was lower in the steeper zones of the basin than in the flatter ones. A comparison with the Ks data…
Current Bioactive Azole-Containing Natural Products
2010
Complexation of phosphine ligands with peracetylated β-cyclodextrin in supercritical carbon dioxide: spectroscopic determination of equilibrium const…
2007
The interaction between peracetylated beta-cyclodextrin and several triphenyl phosphine derivatives was studied in supercritical carbon dioxide (scCO2) by UV-visible spectroscopy. The equilibrium constant for a 1:1 complexation reaction was obtained from titration spectra and calculated using two established mathematical models. The values of the equilibrium constants are 1-3 orders of magnitude smaller than those obtained in aqueous solution with analogous phosphines. This is likely due to the absence in scCO2 of the hydrophobic effect, which is replaced by a corresponding, but weaker, CO2-phobic effect. The largest value of Kf was found for complexes of diphenyl(4-adamantylphenyl)phosphin…
ARYL-VINYLSULFONE—REAGENTIEN ZUM SCHUTZ UND NACHWEIS VON THIOLFUNKTIONEN
1983
Abstract Aryl vinyl sulfones selectively react with thiol groups to acid-stable compounds which easily are cleaved by mild bases to thiol compounds. Ester and amide groups are not attacked under these conditions. Therefore, these compounds are good protecting groups or labels in peptide chemistry. The following aryl vinyl sulfones were investigated: phenyl vinyl sulfone 1, p-carbethoxyphenyl vinyl sulfone 15 and the fluorescent 5-dimethylaminonaphthyl 1-vinyl sulfone 5 and 5-methoxynaphthyl-1 vinyl sulfone 10. The last two compounds are very useful reagents for the quantitative determination of SH-groups in polypeptides such as enzymes. Aryl-vinylsulfone reagieren selektiv mit Thiolgruppen …
Evidence of the Gluten-Free and Casein-Free Diet in Autism Spectrum Disorders
2014
In autism spectrum disorders, many parents resort to alternative treatments and these are generally perceived as risk free. Among these, the most commonly used is the gluten-free, casein-free diet. The objective of this work was to conduct a systematic review of studies published from 1970 to date related to the gluten-free, casein-free diet in autism spectrum disorder patients. Few studies can be regarded as providing sound scientific evidence since they were blinded randomized controlled trials, and even these were based on small sample sizes, reducing their validity. We observed that the evidence on this topic is currently limited and weak. We recommend that it should be only used after…
Bestimmung von Tri-n-butylphosphat in Plasmapräparaten nach Festphasenextraktion und Kapillar-Gaschromatographie
1988
A simple method for the quantitative determination of tri-n-butylphosphate in blood plasma preparations is described. The sample is passed through an octadecyl extraction column from which tri-n-butylphosphate is eluted with chloroform. By capillary GC 50 micrograms/l tri-n-butylphosphate can be detected with a recovery of more than 90%.
Über die struktur eines räumlich gebauten, aus 2.4.6-Tri(hydroxymethyl)-phenol erhaltenen polykondensates
1960
Bei der Schmelzkondensation von 2.4.6-Tri(hydroxymethyl)-phenol entsteht ein raumlich gebautes Polykondensat, das uber Dimethylenatherbrucken verknupfte Phenolkerne enthalt. Dies kann durch die quantitative Bestimmung der bei der Polykondensation erhaltenen Abspaltungsprodukte gezeigt werden; ferner durch die Bromanalyse der Hydrolyseprodukte aus der quantitativ verfolgten Hydrolyse der Polykondensate mit gasformigem HBr. Setzt man die ublichen Atomabstande und Bindungswinkel in Rechung, so sollten in dem raumlich gebauten Netzwerk Dreikern-, Vierkern-, Funfkern-, Sechskern- und hohere Kernringe vorkommen konnen. Ein Beispiel hierfur ist die Vierkernringverbindung mit der Konstitution IIIβ.…
Climas motivacionales, motivación autodeterminada, afectos y burnout en deportistas: enfoque multinivel
2017
ResumenEste estudio tuvo como objetivo poner a prueba un modelo de mediación multinivel que examinó las relaciones entre la percepción del clima motivacional generado por los entrenadores a nivel de equipo y los afectos y el burnout a nivel individual, mediados por la motivación autodeterminada. Participaron 745 atletas universitarios de diversos deportes, con edades entre 17 a 28 años (M = 21.46, DT = 2.14) quienes completaron los instrumentos que evaluaban las variables del estudio (PMCSQ-2, SMS-II, PANAS y ABQ). Los resultados mostraron que a nivel individual (nivel intra), la motivación autodeterminada se relacionaba positivamente con el afecto positivo; por el contrario, se relacionab…