Adriana dos Passos Lemos, Carlos E. Peres-Sampaio, Horácio Guimarães-Motta, Jerson L. Silva and José R. Meyer-Fernandes* Departamento de Bioqmmica Medica, Instituto de Ciencias Biomedicas, Universidade Federal do Rio de Janeiro (UFRJ), Ilha do Fundäo, 21941-590. Rio de Janeiro, RJ. Brazil. Fax: (+55) (+21) 270-8647. E-mail: [email protected] * Author for correspondence and reprint requests ...

The work focuses on research related to determination of application possibility of new, ecofriendly boroorganic polyols in rigid polyurethane foams production. Polyols were obtained from hydroxypropyl urea derivatives esterified with boric acid and propylene carbonate. The influence of esterification type on properties of polyols and next on polyurethane foams properties was determined. Nitrog...

The midge, Belgica antarctica Jacobs, is subjected to numerous environmental stressors during its 2-year life cycle on the Antarctic Peninsula, and in response it has evolved a suite of behavioral, physiological, and life-cycle modifications to counter these stressors, but thus far only a limited number of biochemical adaptations have been identified. In this study, we use a metabolomics approa...

The effects of steam sterilization and gamma-irradiation on chitosan and thermogelling chitosan-beta-glycerophosphate (GP) solutions containing polyol additives were investigated. The selected polyols were triethylene glycol, glycerol, sorbitol, glucose and poly(ethylene glycol) (PEG). They were incorporated to chitosan solutions prior to sterilization in a proportion ranging from 1 to 5% (w/v)...

Based on profiles of secondary metabolites produced by marine bacteria obtained using LC/MS, succinilenes A-D (1-4), new triene polyols, were discovered from a culture of a Streptomyces strain SAK1, which was collected in the southern area of Jeju Island, Republic of Korea. The gross structures of 1-4 were primarily determined through analysis of NMR spectra. The double bond geometries of the s...

Fluorescent, aqueous-soluble, crosslinked dendronized polyols (CDPs) are obtained through a sequential process involving ring-opening metathesis polymerization (ROMP), intra-chain ring-closing metathesis (RCM), and hydrolysis. This general strategy improves the quantum yields (QYs), brightness, and photostability of five common fluorophores whose emission wavelengths cover 150 nm. Additionally,...

Dinucleoside 5',5"'- P (1), P ( n )-polyphosphates, and particularly the diadenosine compounds, have been implicated in extracellular purinergic signalling and in various intracellular processes, including DNA metabolism, tumour suppression and stress responses. If permitted to accumulate, they may also be toxic. One approach to understanding their function is through the various specific degra...

Krasol® polybutadiene diols are anionically polymerized products characterized by very narrow molecular weight distribution, linear structure of polymer chains and the absence of species with functionality higher than 0.2. These unique features make them suitable as hydrophobic polyol components for use in thermoplastic polyurethanes (TPUs). Various TPU formulations were developed using polybut...

In this research work, a series of thermoset polyurethane (tPU) nanocomposites and thermoplastic PU (TPPU) were synthesized using semi-crystalline polyols. Poly(?-caprolactone) (PCL), poly(tetramethylene glycol) (PTMG), different architecture compositions PCL PTMG used as diols. was to synthesize TPPU (PCL-TPPU) the control specimen. Cellulose nanowhisker (CNW), with 1.0 wt% content, for synthe...