Organics

Ferrocenes Bearing Highly Extended π Systems with Nitrile, Nitro, and Dimethylamino End Groups
Oligophenylene-ethynylenes are a popular class of molecular wires for molecular electronics. Replacement of some, not all, of the 1,4-phenylene units by 1,1′-ferrocenylene moieties generates less rigid entities with a limited conformational flexibility. Within this concept, the syntheses of some 1,1′-disubstituted ferrocenes that bear arylethynyl or 4-(arylethynyl)phenyl substituents is pre...


Dissolution of rayon fibers for size exclusion chromatography: a challenge
Application of size exclusion chromatography (SEC) for the analysis of cellulose samples is often limited due to poor solubility in the solvent system N,N-dimethylacetamide/lithium chloride (DMAc/LiCl). Hence different activation or derivatization methods have been developed and published. Most of these methods are laborious, influence the molar mass distribution or do not support dissolution o...
Study of interaction between nitrogen DBD plasma-treated viscose fibers and divalent ions Ca2+ and Cu2+
Viscose fibers were treated with atmospheric pressure dielectric barrier discharge (DBD) plasma obtained in nitrogen in order to activate the fiber surface prior to sorption of the divalent ions Ca2+ and Cu2+. Methylene blue sorption was used for estimation of carboxyl group formation on the surface after DBD plasma treatment, through the degree of fabric staining (K/S). Sorption of divalent io...


Improving anti-UV performances of cotton fabrics via graft modification using a reactive UV-absorber
In this study, a reactive UV-absorber (UV-DTHM) was synthesized by the reaction of 2,4-dihydroxy benzophenone with 2,4,6-trichlorotriazine and showed excellent ultraviolet absorption property and good thermostability. Using pad-dry-steam process, UV-DTHM was grafted into bleached cotton fabric through the covalent surface modification of the cotton fibers. The optimal finishing conditions, such...
Cationic wood cellulose films with high strength and bacterial anti-adhesive properties
In this work, periodate oxidized birch wood pulp and microfibrillated cellulose (MFC) were cationized using Girard’s reagent T or aminoguanidine. Cationic celluloses were used to obtain films via solvent-casting method, and the effects of the cationization route and the cellulose fiber source on the properties of the films were studied. Thermal and optical properties of the films were measure...


Polyaromatic hydrocarbons do not disturb liquid–liquid phase coexistence, but increase the fluidity of model membranes
Polyaromatic hydrocarbons (PAHs) is a group of compounds, many of which are toxic, formed by incomplete combustion or thermal processing of organic material. They are highly lipophilic and thus present in some seed oils used for human consumption as well as being increasingly common in aquaculture diets due to inclusion of vegetable oils. Cytotoxic effects of PAHs have been thought to be partly...
Fatty Acid Profiles of Virgin Olive Oils from the Five Olive-Growing Zones of Extremadura (Spain)
In this study, 278 samples of virgin olive oil from 40 mills belonging to five olive-growing zones of Extremadura were evaluated according to their fatty acid composition. An analysis of variance of the fatty acid contents, and their principal group subtotals and ratios revealed significant differences at the 95 % confidence level between zones. Means were compared using Tukey’s HSD test (p...

Iron inhibits Escherichia coli topoisomerase I activity by targeting the first two zinc-binding sites in the C-terminal domain
Escherichia coli DNA topoisomerase I (TopA) contains a 67 kD N-terminal catalytic domain and a 30 kD C-terminal zinc-binding region (ZD domain) which has three adjacent tetra-cysteine zinc-binding motifs. Previous studies have shown that E. coli TopA can bind both iron and zinc, and that iron binding in TopA results in failure to unwind the negatively supercoiled DNA. Here, we report that each ...
High Resolution Crystal Structures of the Photoreceptor Glyceraldehyde 3-Phosphate Dehydrogenase (GAPDH) with Three and Four-bound NAD Molecules
Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) catalyzes the oxidative phosphorylation of D-glyceraldehyde 3-phosphate (G3P) into 1,3-diphosphoglycerate (BGP) in the presence of the NAD cofactor. GAPDH is an important drug target because of its central role in glycolysis, and non-glycolytic processes such as nuclear RNA transport, DNA replication/repair, membrane fusion and cellular apoptosis...

Slow-released NPK fertilizer encapsulated by NaAlg-g-poly(AA-co-AAm)/MMT superabsorbent nanocomposite
A novel slow released NPK fertilizer encapsulated by superabsorbent nanocomposite was prepared via in-situ free radical polymerization of sodium alginate, acrylic acid, acrylamide, and montmorillonite in the presence of fertilizer compounds. Evidence of grafting and component interactions, superabsorbent nanocomposite structure and morphology was obtained by a FT-IR, XRD and SEM techniques. The...
UV-stable paper coated with APTES-modified P25 TiO2 nanoparticles
In order to inhibit the photocatalytic degradation of organic material supports induced by small titania (TiO2) nanoparticles, highly photocatalytically active, commercially available P25-TiO2 nanoparticles were first modified with a thin layer of (3-aminopropyl)triethoxysilane (APTES), which were then deposited and fixed onto the surface of paper samples via a simple, dip-coating process in wa...

Evaluation of the ability of xanthan gum/gellan gum/hyaluronan hydrogel membranes to prevent the adhesion of postrepaired tendons
After tendon-repair surgery, adhesion between the surgical tendon and the synovial sheath is often presented resulting in poor functional repair of the tendon. This may be prevented using a commercially available mechanical barrier implant, Seprafilm, which is composed of hyaluronan (HA) and carboxymethyl cellulose hydrogels. In a rat model, prepared membranes of various compositions of gellan ...
Toughening mechanisms in interfacially modified HDPE/thermoplastic starch blends
The mechanical behavior of polymer blends containing 80wt% of HDPE and 20wt% of TPS and compatibilized with HDPE-g-MA grafted copolymer was investigated. Unmodified HDPE/TPS blends exhibit high fracture resistance, however, the interfacial modification of those blends by addition of HDPE-g-MA leads to a dramatic drop in fracture resistance. The compatibilization of HDPE/TPS blends increases the...
Three-dimensional electrospun polycaprolactone (PCL)/alginate hybrid composite scaffolds
Micro/nanofibrous scaffolds have been used widely in biomedical applications because the micro/nano-scale fibres resemble natural extracellular matrix and the high surface-to-volume ratio encourages cellular activities (attachment and proliferation). However, poor mechanical properties, low controllability of various shapes and difficulties in obtaining controllable pore structure have been obs...
Changes of structure and property of alkali soluble hydroxyethyl celluloses (HECs) and their regenerated films with the molar substitution
Hydroxyethyl celluloses (HECs) with low molar substitutions (MS) were prepared by reaction of alkali cellulose with ethylene oxide (EO) in a heterogeneous process. NMR, FTIR, WAXD, TG, solubility and tensile tests were adopted to investigate the changes of structures and properties of HECs with their MS values. NMR results showed that the hydroxyethyl groups were introduced into the cellulose c...