Materials Literature
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Abstract This paper provides an overview of recent progress made in the area of cellulose nanofibre-based nanocomposites. An introduction into the methods used to isolate cellulose nanofibres (nanowhiskers, nanofibrils) is given, with details of their structure. Following this, the article is split into sections deali…
Des echantillons de diatomees tychoplanctoniques et epilithiques ont ete preleves tous les mois pendant une annee sur 18 stations dans le cours inferieur de quelques fleuves et rivieres de la region nord-centre du Portugal. L'analyse canonique des correspondances a ete utilisee pour examiner les relations entre les va…
The physical and mechanical properties of aliphatic homopolyesters from monomers obtainable from renewable resources, namely, 1,3-propanediol and succinic acid, were improved by their combination with aromatic urethane segments capable of establishing strong intermolecular hydrogen bonds. Segmented poly(ester-urethane…
The surface free energy and its dispersion and polar components of pigskin were determined by wettability measurements. The contact angles and work of adhesion of solutions of the synthetic model adhesive sequence poly(Gly-Tyr-Lys) inspired by marine adhesive proteins were measured on the epidermis and the dermis of p…
The knowledge of the exact electronic structure of Co(II) porphyrins is important in view of their interest as models for the prosthetic groups in proteins and in view of their use as catalysts. Here, we present a continuous wave and pulse electron paramagnetic resonance (EPR) study of CoTPP (5,10,15,20-tetraphenyl-21…
The complex cobaltite TlSr2CoO5 undergoes a first-order metal–insulator phase transition at room temperature. The structures of the high temperature (HT) and low temperature (LT) phases have been refined on powder samples using electron diffraction, X-ray diffraction and EXAFS. The HT-phase is isostructural with the s…
The structural and thermodynamic behavior of the complex formation of eIF4E with either or both mRNA cap analogue (m7GTP, m7GpppA, or m7GpppG) and 4EBP1 has been investigated by spectroscopic measurements. Although the circular dichroism (CD) spectrum of eIF4E was little affected by the association with any cap analog…
Ba ++ , Pb ++ , and Cd ++ . The addition of Mn ++ , Ba ++ , and Ca ++ (10 mM) during the hydrolysis of Avicel PH 101 caused an increase in the total reducing sugar (TRS) for CBH I by 142, 135, and 114 percent, respectively. Those for CBH II increased by 177, 175, and 115 percent, respectively. The Mn ++ was the most s…
Terpolímeros de poli(álcool vinílico) foram sintetizados por meio de reação de esterificação do PVA parcialmente hidrolisado com cloretos de ácidos graxos de comprimento de cadeia diferentes. O objetivo da síntese foi obter polímeros à base de PVA com pequenas variações no balanço hidrófilo/lipófilo e nas propriedades…
A range of electron-rich organic molecules has been intercalated into MoS2 by the method of exfoliation–reflocculation. Intercalation produces an expansion of the lattice in a direction perpendicular to the dichalcogenide layers, the magnitude of which suggests that in the majority of cases, the guest adopts an orient…
The binding of tetracationic Λ- and Δ-europium complexes of tetraamide and triamide ligands incorporating an N-methylphenanthridinium group to calf-thymus DNA, poly(dGdC) and super-coiled plasmid DNA has been monitored by absorption, luminescence and CD difference spectroscopy. With the tetraamide complexes, preferent…
Efficient syntheses of the novel, pyrene containing branched building blocks 10, 13, 22, 25 and of a pyrene based core molecule 16 for the construction of dendrimers are reported. The main tool is a Suzuki cross-coupling. The functional groups for further growth are amines and carboxylic acids, which were used in an o…
Natural-silica-rich glasses (impactites, tektites and obsidians) have been investigated with infrared (IR), Raman and optical spectroscopy. Comparison with artificial glasses with silica-rich and alkali-rich compositions is made. The vibrational data of these compounds are discussed in relationship with their structur…
Let G be either GL 2 (R) or GL 2 (C) with maximal compact subgroup K. Let g be its complexified Lie algebra. In this paper, we will construct (g, K)-invariant forms on 3 i=1 i where i is an infinitesimal principal series representation.
Heat conditions for synthesis of Fe16N2 tine particles and the resulting magnetic properties were investigated. Commercial ultra fine γ - Fe2O3 particles were first reduced under hydrogen gas at temperatures between 200°C and 700°C for 8 hours and nitrided under an ammonia-argon mixed gas at 140°C for 24 hours. The po…
Addition of iron sulfate to Pt-promoted tungstated zirconia increases the activity and selectivity of the catalyst for isomerization of n-pentane in the presence of H2; selectivities >98% have been observed.
Polypyrrole (PPy)/ion-conducting polymer electrolyte (PE) composites are prepared by in situ electropolymerization of pyrrole in a solvent-free PE matrix which is formed by photocross-linking of triacrylated poly(ethylene oxide- co -propylene oxide) (TA). X-ray photoelectron spectroscopy measurements reveal the gradie…
The characterization of the structure of mumbaistatin (1), an effective inhibitor of the glucose-6-phosphatase system (EC 3.1.3.9), is reported. Isolation of mumbaistatin from cultures of Streptomyces sp. DSM 11641 was achieved by anion-exchange and reversed-phase chromatography. The acid-labile inhibitor was methylat…
While for intercalation compounds of natural smectites 2D long range order of the interlamellar space was never observed, in-plane order can be detected using a homogeneously charged synthetic fluorohectorite as host material. With these intercalates distinct 2D structures for enantiopure and racemic [Ru(bpy)3]2+-inte…
The dynamics of excited state indole–(NH 3 ) n clusters has been investigated with two-color two-photon ionization. Mass spectra recorded with delayed ionization indicate that a hydrogen transfer reaction indole(S 1 )–(NH 3 ) n → C 8 H 6 N • + NH 4 (NH 3 ) n – 1 occurs for n = 3, 4, 5.