Three-dimensional Pt-coated Au nanoparticle arrays: applications for electrocatalysis and surface-enhanced Raman scattering.

This study demonstrates a novel approach to synthesis methods for core-shell nanoparticle assembly using nanoparticle trapping at an interface and subsequent transfer onto a substrate for electrochemical ultrathin layer coating. The transferred nanoparticle array can have a tunable surface area depending on the number of transferred layers. Subsequently coating the surface with Pt-group metals that behave as an ultrathin film provides electrocatalytic activities with respect to a variety of chemical reactions, depending on the properties of the selected coating materials.

Linker-molecule-free gold nanorod layer-by-layer films for surface-enhanced Raman scattering.

This paper reports a methodology for synthesizing and ordering gold nanorods into two-dimensional arrays at a water/hexane interface. This preparation method allows the systematic control of the nanoparticle film thickness. An investigation into the thickness-dependent surface-enhanced Raman scattering (SERS) of the adsorbed molecules revealed the nanorod (NR) films to have 1 order of magnitude stronger SERS enhancement than the nanosphere (NS) under similar experimental conditions.

Surface enhanced Raman scattering from layered assemblies of close-packed gold nanoparticles.

A synthetic method of ordering hydrophilic gold nanoparticles into a close-packed two-dimensional array at a hexane-water interface and subsequent transferring of such structure onto a solid substrate is described. By repeating the transfer process, multilayered gold nanoparticle films are formed without need of linker molecules. Their surface enhanced Raman scattering (SERS) efficiencies are compared as a function of the number of layers.

Assembly of highly ordered nanoparticle monolayers at a water/hexane interface.

This paper reports a methodology for preparing ordering hydrophilic metal nanoparticles into close-packed 2-dimensional arrays at a hexane-water interface with alkanethiol in the hexane layer. The destabilization of metal nanoparticles by the addition of alcohol caused the nanoparticles to adsorb to an interface where the surface of entrapped Au nanoparticle was in situ coated with the long-chain alkanethiols present in a hexane layer. The adsorption of alkanethiol to the nanoparticle surface caused the conversion of the electrostatic repulsive force to a van der Waals interaction, which is a key feature in forming highly ordered close-packed nanoparticle arrays.

Septate uterus with double cervices, unilaterally obstructed vaginal septum, and ipsilateral renal agenesis: a rare combination of müllerian and wolffian anomalies complicated by severe endometriosis in an adolescent.

We present a previously unreported combination of müllerian and wolffian anomalies of a septate uterus with double cervices, unilaterally obstructed vaginal septum, and ipsilateral renal agenesis; this constellation of findings may offer clues that could modify classic embryologic explanations. In spite of the young age of our patient (15-years old), a chief complaint of malodorous vaginal discharge, and absence of dysmenorrhea or any other symptoms of endometriosis, laparoscopic examination revealed severe endometriosis with dense adhesions, probably as a result of abundant menstrual regurgitation. Laparoscopic resection of endometriotic lesions, adhesiolysis, and vaginoscopic septotomy were successfully performed while preserving hymenal integrity.

Persistent HPV infection after conization in patients with negative margins.

Objectives: To investigate the rate of clearance of high-risk HPV after conization with negative margins and to identify the factors that may predict high-risk HPV clearance/persistence after conization with negative margins.

Methods: We performed a retrospective review of 69 patients (mean age 39.5 years, range 25-60 years) with histologically verified CIN 2 or CIN 3 who underwent electroknife conization with negative margins between March 2002 and December 2003.

2,5-Pyridinedicarboxylic acid derivatives as non-nucleosidic reverse transcriptase inhibitors of hepatitis B virus.

2,5-Pyridinedicarboxylic acid derivatives were found to be the potent non-nucleoside inhibitors of hepatitis B virus (HBV) with IC(50) View Article and Find Full Text PDF