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41.
42.
The use of 1,1,3,3-tetramethylguamdine (TMG) as a medium for the titrations of weak acids has been investigated. The hydrogen electrode behaves reversibly in this solvent and can serve as an indicator electrode in titration reactions. The titrant was a o.1 M solution of tetrabutylammonium hydroxide in a 90-10% mixture of TMG and methanol. A hydrogen electrode dipping into a TMG solution saturated with benzoic acid served as reference electrode. Potentiometric titrations of a number of weak acids gave results accurate to at least ±0.5%. It was found that in most cases curcumin could be used as an end-point indicator with an accuracy comparable to that of the potentiometric titration. 相似文献
43.
Mounicou S Vonderheide AP Shann JR Caruso JA 《Analytical and bioanalytical chemistry》2006,386(5):1367-1378
Selenoproteins have been identified in a diverse range of organisms, including bacteria and animals. Their occurrence and
role in the plant kingdom are, however, less well-understood. This work investigated the water-soluble selenium-containing
proteins extracted from a selenium-accumulating plant species (Brassica juncea) and a nonaccumulator species (Helianthus annuus) exposed to varying forms and concentrations of selenium. Firstly, protein extracts were analyzed by size exclusion chromatography
coupled to inductively coupled plasma mass spectrometry; specific detection was achieved by monitoring characteristic isotopes.
Then, proteolytic digests of the plant extracts were analyzed by reversed phase chromatography coupled to ICP–MS in order
to investigate selenoamino acid and selenopeptide content. Selenomethionine was observed to be the primary constituent of
the proteins of the nonaccumulator plant, while selenocystine and selenomethionine were found in the same proportion in the
accumulator extract. One main selenium-containing species was present at higher levels in the root digests than in the leaf
digests; levels were greater in the nonaccumulator than in the accumulator plant. 相似文献
44.
Swayambhu Behera Justin Wilks Peter A. Dowben M. Sky Driver A.N. Caruso Jeffry A. Kelber 《Surface science》2010,604(21-22):L51-L54
We show that dopant impurities can be introduced in a controlled, site-specific manner into pre-deposited semiconducting boron carbide films. B―N bond formation has been characterized by X-ray photoelectron spectroscopy for semiconducting B10C2Hx films exposed to vacuum ultraviolet photons in the presence of NH3. Core level photoemission data indicate that B―NH2 bonds are formed at B sites bonded to other boron atoms (B―B), and not at boron atoms adjacent to carbon atoms (B―C) or at carbon atom sites. Nitridation obeys diffusion-limited kinetics. These results indicate that dopant species can be introduced in a controlled, site-specific manner into pre-deposited boron carbide films, as opposed to currently required dopant incorporation during the deposition process. 相似文献
45.
J.P. Velev P.A. Dowben E.Y. Tsymbal S.J. Jenkins A.N. Caruso 《Surface Science Reports》2008,63(9):400-425
Recent advances in thin-film deposition techniques, such as molecular beam epitaxy and pulsed laser deposition, have allowed for the manufacture of heterostructures with nearly atomically abrupt interfaces. Although the bulk properties of the individual heterostructure components may be well-known, often the heterostructures exhibit novel and sometimes unexpected properties due to interface effects. At heterostructure interfaces, lattice structure, stoichiometry, interface electronic structure (bonding, interface states, etc.), and symmetry all conspire to produce behavior different from the bulk constituents. This review discusses why knowledge of the electronic structure and composition at the interfaces is pivotal to the understanding of the properties of heterostructures, particularly the (spin polarized) electronic transport in (magnetic) tunnel junctions. 相似文献
46.
Caruso A Voisin-Chiret AS Lancelot JC Sinicropi MS Garofalo A Rault S 《Molecules (Basel, Switzerland)》2008,13(6):1312-1320
A synthetic method for the preparation of 6-aryl-1,4-dimethyl-9H-carbazoles involving a palladium catalyzed coupling reaction of 1,4-dimethyl-9H-carbazole-6-boronic acids and (hetero)aryl halides is described. 相似文献
47.
Cavalieri F Ashokkumar M Grieser F Caruso F 《Langmuir : the ACS journal of surfaces and colloids》2008,24(18):10078-10083
High-intensity ultrasound induces emulsification and cross-linking of protein molecules in aqueous medium. The stability and the functionality of the resultant protein-coated microbubbles are crucial in many of their applications. For example, the stability of drug-loaded microbubbles should be sufficiently long enough, in vivo, so that they can be ruptured only at specific sites for release of the drugs. In this study, we report the synthesis of stable and functional microbubbles, coated with chemically reduced lysozyme, using high-intensity ultrasound in aqueous solution. In the absence of chemical reduction, stable microbubbles were not produced with native lysozyme, indicating the importance of free -SH functional groups for protein cross-linking. The degree of cross-linking between lysozyme molecules was controlled by manipulating both the extent of chemical reduction of the intramolecular disulfide bonds and sonication time. The lysozyme-coated microbubbles are stable for several months and retain the enzymatic (antimicrobial) activity of lysozyme. The layer-by-layer (LbL) deposition of polyelectrolytes onto the protein-shell air-core template has been used as a versatile procedure to modify the surface properties of the microbubbles, indicating the possibility of adsorbing potential drugs and/or biolabels on the surface of these microbubbles for therapeutic and diagnostic applications. 相似文献
48.
Synthesis of Discrete Alkyl‐Silica Hybrid Nanowires and Their Assembly into Nanostructured Superhydrophobic Membranes
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Dr. Deliang Yi Chenglong Xu Ruidie Tang Assoc. Prof. Xuehua Zhang Prof. Frank Caruso Prof. Yajun Wang 《Angewandte Chemie (International ed. in English)》2016,55(29):8375-8380
We report the synthesis of highly flexible and mechanically robust hybrid silica nanowires (NWs) which can be used as novel building blocks to construct superhydrophobic functional materials with three‐dimensional macroporous networks. The hybrid silica NWs, with an average diameter of 80 nm and tunable length of up to 12 μm, are prepared by anisotropic deposition of the hydrolyzed tetraethylorthosilicate in water/n‐pentanol emulsions. A mechanistic investigation reveals that the trimethoxy(octadecyl)silane introduced to the water‐oil interface in the synthesis plays key roles in stabilizing the water droplets to sub‐100 nm and also growing a layer of octadecyl groups on the NW surface. This work opens a solution‐based route for the one‐pot preparation of monodisperse, hydrophobic silica NWs and represents an important step toward the bottom‐up construction of 3D superhydrophobic materials and macroporous membranes. 相似文献
49.
DeNicola Cafferky K Thompson RL Richardson DD Caruso JA 《Analytical and bioanalytical chemistry》2007,387(6):2037-2043
Metals and metal-containing compounds are known to play important roles in many biological processes, including metabolic
and detoxification pathways and the formation and function of proteins. Like all organisms, viruses are expected to contain
different metals. These metals, either by themselves or in the form of metalloproteins, may be involved in the virus’s ability
to infect healthy cells and replicate within them. Identification and speciation of metals in control cells and in cells affected
by a virus could be helpful in elucidating infection and replication mechanisms; these might, in turn, be vital to the development
of more effective treatments. There has, however, been no extensive investigation of the metals specific viruses contain or
affect. The objective of this study was to investigate changes in cellular metal content resulting from herpes simplex virus
1 (HSV-1) infection. Inductively coupled plasma mass spectrometry was used to identify differences between metal concentrations
in uninfected and HSV-1-infected mammalian cells. Although it can be assumed that decreases in metal content are a result
of cellular response to the virus, increases can be attributed either to cellular response or to the HSV-1 virus itself. Microwave
digestion and flow injection methods suitable for small sample volumes were used, and the effects of different virus inactivation
procedures were explored. This work is the first step in the identification of metals pertinent to HSV-1 infection and lays
the foundation for future studies concentrating on characterization of these metal-associated or containing molecules. 相似文献
50.
Wang X Egan CE Zhou M Prince K Mitchell DR Caruso RA 《Chemical communications (Cambridge, England)》2007,(29):3060-3062
Gold nanoparticles were synthesized using agarose as a reducing agent, which gelled to support the gold nanoparticles, then readily functioned as a template to produce a porous, evenly-distributed Au/TiO(2) nano-hybrid. 相似文献