Results 121 to 130 of about 49,414 (256)
Experimental methods in chemical engineering: Temperature‐programmed desorption—TPD
The Canadian Journal of Chemical Engineering, EarlyView.Abstract Temperature‐programmed desorption (TPD) characterizes the surface active sites of functional materials, such as adsorbents (metal hydrides, porous carbons, zeolites, metal–organic frameworks, for example) and catalysts. Solids surfaces are pre‐treated to remove moisture, contaminants, and previously adsorbed species, then a probe molecule (NH3$
Daniel A. Valdivieso‐Vera +2 more
wiley +1 more source
Anais da Academia Brasileira de CiênciasA new lactone, 7-epi-griffonilide (1), and six known compounds, 2, 3a - 3c, 4a and 4b, were isolated from the leaves of Bauhinia pentandra (Fabaceae). The structures elucidation of 1 and 2 were based on detailed 2D NMR techniques and spectral comparison ...
MACIA C.S. DE ALMEIDA +8 more
doaj +1 more source
The conversion of racemic terminal epoxides into either (+)- or (-)-diol gamma- and delta-lactones
, 2000 The conversion of racemic terminal epoxides into either (+)- or (-)-diol gamma- and delta-lactones is described with hydrolytic kinetic resolution (HKR) as the key ...
Liu, ZY +3 more
core
The synthesis of model lactones of cyclolignan type
, 1981 Lactones VI-IX were prepared on reduction of anhydrides of 4-aryl-1-methoxynaphthalene-2,3-dicarboxylic acids IV and V with sodium borohydride in methanol. Catalytic hydrogenation on platinum of lactones VIII and IX gave lactones with hydrogenated ring A,
Jiří Křepelka, Jiří Holubek
core +1 more source
Cytoskeleton, EarlyView.ABSTRACT Microtubules play essential roles in numerous cellular processes. All microtubules are built from the protein tubulin, yet individual microtubules can differ spatially and temporally due to their tubulin isotype composition and post‐translational modifications (PTMs).
Ezekiel C. Thomas +5 more
wiley +1 more source
Synthesis of γ-lactones with aromatic substituents [PDF]
, 2013 Biological activities of lactones are predominantly determined by different substituents on a lactone ring. γ-Lactones with aromatic substituents have interesting biological activities and serve as useful intermediates in the synthesis of many natural ...
Gładkowski, W., Skrobiszewski, A.
core
Synthetic approaches to naturally occurring ten-membered-ring lactones
, 2007 The strategies for the synthesis of naturally occurring ten-mernbered-ring lactones, which are the most abundant of the medium-ring lactones, are discussed.
Longo Junior, Luiz S. [UNIFESP] +2 more
core +1 more source
Clinical Pharmacology &Therapeutics, EarlyView.Accurate assessment of systemic drug exposure in humans remains challenging, as conventional approaches rely on intermittent blood sampling and laboratory‐based assays that are invasive and provide limited temporal resolution. Exhaled breath contains volatile and semi‐volatile compounds arising from drug metabolism and downstream biological processes ...
Kai Fricke +12 more
wiley +1 more source
ChemSusChem, Volume 18, Issue 6, March 15, 2025.Sustainable hydrogen production can be obtained from hydogen‐rich biomass‐derived organic molecules through Acceptorless Dehydrogenation (AD) reactions. Glycerol and sugars are available in large quantities from industry and can be successfully used as substrates in AD protocols, in the presence of tailored, selective, easily tunable and thermally ...
Sylwia Kostera, Luca Gonsalvi
wiley +1 more source
Química Nova, 2013 The chemical investigation of hexane and ethanol extracts from the aerial parts of Vernonia scorpioides resulted in the isolation and characterization of a new polyacetylene lactone, rel-4-dihydro-4β-hydroxy-5a-octa-2,4,6-triynyl-furan-2-(5H)-one ...
Adalva Lopes Machado +8 more
doaj