Materials Literature
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Abstract The divergent dendronization of an ϵ‐caprolactone‐based polymer has been performed to provide access to dendronized polymers with sufficient biocompatibility and degradability for use as drug‐delivery scaffolds. The synthesis was performed through the tin(II) 2‐ethylhexanoate‐catalyzed polymerization of a γ‐f…
The wet air regeneration of some 4-chloro-2-methylphenoxyacetic acid (MCPA) exhausted activated carbons (ACs) has been investigated. The wet oxidation process of MCPA in the absence of ACs suggests the development of a a radical mechanism. Oxygen partial pressure has been shown not to affect the process, while pH exer…
Abstract As an experimental necessity, past flame spread studies have relied on fast burning cellulosic papers. For the longer duration tests planned for the International Space Station a 50% fiberglass, 50% cotton composite fabric is better suited for the novel fuel feeding system in the compact hardware design of a…
Part I of this article describes a series of tests of localized, penetrating impact on sandwich panels. The sandwich panel size was 500 500 mm 2 with a thickness of 46 mm. Three types of panel configuration were tested. Penetration was carried out in quasi-static conditions and at approximately 70 and 93 m/s. Impactor…
Diblock copolymers containing recognition units designed to participate in specific three-point hydrogen bonding were adsorbed onto modified gold surfaces. Self-assembled monolayers (SAMs) containing complementary recognition units were used to direct the adsorption process. The polymer-modified surfaces obtained were…
Thermal diffusivity of the composites of camphor sulphonic acid (CSA) doped polyaniline (PANI) and its composites with cobalt phthalocyanine (CoPc) has been measured using open cell photoacoustic technique. Analysis of the data shows that the effective thermal diffusivity value can be tuned by varying the relative vol…
Sequentially spectrophotometric titrations by sodium hydroxide of meso-tetraphenylporphyrin derivatives bearing one, two, three, or four p-hydroxyl groups result in new types of spectra. The strong new bands appear in the visible region with splitting or broadening of the Soret band and its significant loss of oscilla…
High-pressure electrical conductivity experiments have been performed on the Mott insulator $\mathrm{MnO}$ to a maximum pressure of $106\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. We observe a steady decrease in resistivity to $90\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$, followed by a large, rapid decrease by a factor o…
Infrared transmission and Raman scattering have been used to study Raman active phonons and crystal-field excitations in Yb 3+ -doped yttrium, lutetium and scandium orthosilicate crystals (Y 2 SiO 5 (YSO), Lu 2 SiO 5 (LSO) and Sc 2 SiO 5 (SSO)), which belong to the same C 2h 6 crystallographic space group. Energy leve…
Flavodoxins are involved in a variety of electron transfer reactions that are essential for life. Although FMN-binding proteins are well characterized in prokaryotic organisms, information is scarce for eukaryotic flavodoxins. We describe the 2.0-A resolution crystal structure of the Saccharomyces cerevisiae YLR011w g…
The pressure-induced phase transition in silicon carbide is studied using a constant-pressure ab initio technique. The reversible transition between the zinc-blende structure and the rock-salt structure is successfully reproduced through the simulation. The transformation mechanism at the atomistic level is characteri…
Ultrathin nickel oxide films were grown on the Ag(001) surface by evaporation of Ni in an O 2 atmosphere. The growth mechanism, composition, and structure of the NiO layers formed in the early stages of deposition have been investigated by LEIS, XPS, XPD, and LEED. We found that at O 2 pressures in the 10 -7 − 10 -6 m…
A triad consisting of a carotenoid (C), a dimesitylporphyrin (P), and a tris(heptafluoropropyl)porphyrin (P F ), C−P−P F, has been synthesized and found to undergo rapid singlet−singlet energy transfer between the porphyrin moieties so that their excited states are in equilibrium. Photoinduced electron transfer from t…
Six clusters Ag(8)(micro(8)-X)[Se(2)P(OR)(2)](6)(PF(6)) (R = Et, X = Cl, 1a, X = Br, 1b; R = Pr, X = Cl, 2a, X = Br, 2b; R = (i)Pr, X = Cl, 3a, X = Br, 3b) were isolated from the reaction of [Ag(CH(3)CN)(4)](PF(6)), NH(4)[Se(2)P(OR)(2)], and Bu(4)NX in a molar ratio of 4:3:1 in CH(2)X(2). Positive FAB mass spectra sho…
Nanowire-like iron oxides (α-Fe 2 O 3 , Fe 3 O 4 and γ-Fe 2 O 3 ) of diameter about 200 nm and length up to 8 µm were assembled into anodic aluminium oxide templates through electrodeposition followed by a heat-treating process. These wires have polycrystalline structures and consist of fine particles whose magnetic m…
Deposits of β and α RDX on glass substrates have been examined with optical and Raman microscopy. The measurements reveal significant differences in the morphology and Raman spectra of β and α RDX. Structures that resemble an island, as well as scattered particles, are observed in white light images of β RDX. Well-def…
UDP-galactose 4'-epimerase (GALE) interconverts UDP-galactose and UDP-glucose in the final step of the Leloir pathway. Unlike the Escherichia coli enzyme, human GALE (hGALE) also efficiently interconverts a larger pair of substrates: UDP-N-acetylgalactosamine and UDP-N-acetylglucosamine. The basis of this differential…
The photoluminescence properties of ZnO:N films fabricated by thermally oxidizing Zn3N2 films using plasma-assisted metal-organic chemical vapour deposition, D Wang, Y C Liu, R Mu, J Y Zhang, Y M Lu, D Z Shen, X W Fan
10.1021/la049610t
In this communication, gold nanoparticles with a tadpole shape were synthesized by a simple aqueous-phase chemical method. The unusual three-dimensional and crystallized structures were demonstrated by TEM, AFM, and HRTEM methods. The SEM and UV-visible absorption measurements and electrophoresis experiments revealed…