Here, we elucidate a double-lamellar-template pathway for the formation of CdSe quantum belts. The lamellar templates form initially by dissolution CdX2 precursors in n-octylamine solvent. Exposure precursor to selenourea at room temperature ultimately affords (CdSe)13 nanoclusters entrained within double-lamellar templates. Upon heating, are transformed belts having widths, lengths, and thicknesses that predetermined dimensions This template synthesis is responsible excellent optical...

ConspectusSemiconductor nanocrystals having an extended length dimension and capable of efficiently transporting energy charge would have useful applications in solar-energy conversion other emerging technologies. Pseudocylindrical semiconductor nanowires quantum wires are available that could potentially serve this role. Sadly, however, their defective surfaces contain significant populations surface trap sites preclude efficient transport. The very large area long is at least part the...

Formation of hollow silica nanospheres in a water-in-oil microemulsion.

ABSTRACT Expression of the Msx-1 and Msx-2 homeobox genes have been shown to be co-ordinately regulated with Bmp-2 Bmp-4 ligands in a variety developing tissues. Here we report that transcripts from all four are developmentally during both foetal postnatal mammary gland development. The location timecourse Bmp Msx expression point role for gene products control epithelialmesenchymal interactions. Msx-2, but not Msx-1, or was decreased following ovariectomy, while human homologue by...

CdSe quantum belts (QBs) having lengths of 0.5−1.5 μm and thicknesses 1.5−2.0 nm exhibit high photoluminescence (PL) efficiencies ∼30%. Epifluorescence studies establish the PL spectra to be uniform along single QBs, nearly same from QB QB. Photogenerated excitons are shown effectively delocalized over entire QBs by position-selective excitation. Decoration with gold nanoparticles indicates a low density surface-trap sites, located primarily on thin belt edges. The effective exciton...

Our previous studies have shown that the 49-base pair region of promoter DNA between −1719 and −1670 base pairs is necessary for transcription rat COL1A1 gene in transgenic mouse calvariae. In this study, we further define element to 13-base −1683 −1670. This contains a TAAT motif binds homeodomain-containing proteins. Site-directed mutagenesis context COL1A1-chloramphenicol acetyltransferase construct extending −3518 decreased ratio reporter activity calvariae tendon from 3:1 1:1,...

A direct method of surface silyl modification and simultaneous surfactant removal mesoporous silica is investigated in its physicochemical details. Twelve different silanes various functionalities are studied. The employs an alcohol solution to allow the surfactant/silyl exchange process, which results a more uniform monolayer coverage higher amount attachments silane. We vary concentration study effect on loadings. It found that variation loading group follows Langmuir adsorption model...

Semiconductor magic-size clusters (MSCs), especially II–VI group compounds, are popular materials in nanoscience research due to their unique electronic structures and optical properties. MSCs can be divided into two main categories based on the structures: quasi-spherical with wurtzite-like lattices tetrahedral zincblende-like lattices. Each type has its specific synthetic routes physicochemical This review distinguishes types of compares differences structures, properties, applications. It...

The neural crest plays a crucial part in cardiac development. Cells of the subpopulation cranial migrate from hindbrain into outflow tract heart where they contribute to septum that divides pulmonary and aortic channels. In Splotch mutant mice, which lack functional Pax3 gene, migration is deficient aorticopulmonary septation does not occur. Downstream genes through regulates development are unknown. Here, using combination genetic molecular approaches, we show deficiency caused by...

Four [(CdSe)13(RNH2)13] derivatives (R = n-propyl, n-pentyl, n-octyl, and oleyl) are prepared by reaction of Cd(OAc)2·2H2O selenourea in the corresponding primary-amine solvent. Nanoclusters grow spontaneously formed amine-bilayer templates characterized elemental analysis, IR spectroscopy, UV–vis TEM, low-angle XRD. Derivative [(CdSe)13(n-propylamine)13] is isolated as a yellowish-white solid (MP 98 °C) on gram scale. These compounds first magic-size CdSe nanoclusters to be purity.

Cadmium selenide is a II–VI semiconductor model system known for its nanoparticle preparation, growth mechanism, luminescence properties, and quantum confinement studies. For the past 2 decades, various thermodynamically stable "magic-size nanoclusters (MSCs)" of CdSe have been observed, isolated, theoretically calculated. Nevertheless, none proposed structures were experimentally confirmed due to small crystal domains beyond diffraction limit. With combination nondestructive SAXS, WAXS,...

Reducing the dimensionality of inorganic lattices allows for creation new materials that have unique optoelectronic properties. We demonstrate a layered metal chalcogenide lattice, TiS(2), can form dimensionally reduced crystalline one-dimensional hybrid organic/inorganic TiS(2)(ethylenediamine) framework when synthesized from molecular precursors in solution. This solid has strong absorption above 1.70 eV and pronounced emission near-IR regime. The energy dependence absorption,...

The intercalation of metal cations in 2D layered materials allows for the discovery unique electronic, magnetic and correlated properties. We demonstrate that reversible Li is also achievable hybrid organic/inorganic dimensionally reduced 1D van der Waals solid TiS2(ethylenediamine). Upon intercalation, electrons are injected into lattice as Ti(4+) to Ti(3+) leading an order magnitude decrease electrical resistivity. This process opens up new opportunities fine-tune physical properties this...

In rice, the class I small heat shock protein (sHSP-CI) genes were found to be selectively induced by L-azetidine-2-carboxylic acid (AZC) on chromosome 3 but not 1. Here it is shown that a novel cis-responsive element contributed differential regulation. By serial deletion and computational analysis, 9 bp putative AZC-responsive (AZRE), GTCCTGGAC, located between nucleotides –186 –178 relative transcription initiation site of Oshsp17.3 was revealed. Deletion this AZRE from promoter abolished...

Colloidal CdTe quantum wires are reported having ensemble photoluminescence efficiencies as high 25% under low excitation-power densities. High achieved by formation of a monolayer CdS shell on the wires. Like other semiconductor nanowires, may contain frequent wurtzite-zinc-blende structural alternations along their lengths. The present results demonstrate that optical properties, emission-peak shape and efficiencies, independent presence or absence such alternations.

Aluminium hydroxides were prepared by the laser ablation method, a nanosecond pulsed being employed to irradiate an Al rod immersed in H2O solvent. Through course of aging, bayerite, gibbsite and boehmite particles formed simultaneously. These crystals exhibited three different morphologies. Their shapes triangular (bayerite), rectangular (gibbsite) fibrous (boehmite). The dimensions averaged several hundred nanometers. measurements UV-vis absorption can serve as tool identify whether or not...

Complex molecular interactions dictate the developmental steps that lead to a mature and functional cornea lens. Peters anomaly is one subtype of anterior segment dysgenesis especially due abnormal development MSX2 was recently implicated as potential gene critical for development. However, role within complex mechanisms eye remains elusive. Our present study observed morphologic changes in conventional Msx2 knockout (KO) mice found phenotypes consistent with microphthalmia seen humans. The...

Giant Zeeman splitting and zero-field (ZFS) are observed in 2D nanosheets that have monolayers of atomic thickness. In this study, single-crystalline CdSe(ethylenediamine)0.5 Mn2+-doped synthesized via a solvothermal process. Tunable amounts Mn2+(0.5-8.0%) introduced, resulting lattice contraction as well phosphorescence from five unpaired electrons. The exciton dynamics dominated by spin-related electronic transitions (4T1 → 6A1) with long lifetimes (20.5, 132, 295 μs). Temperature-varied...

AbstractWe are interested in understanding hierarchical regulation pathways that control gene expression developing teeth. In pursuit of the molecular basis for regulated amelogenin by ameloblasts during tooth formation, we isolated murine promoter. Analysis this promoter will provide additional details towards identification signals generated through instructive-, dissimilar-germ layer interactions responsible temporal- and spatial-regulation expression. Using transgenic mice demonstrate a...