Vibrational dynamics of iron pentacarbonyl in cryogenic matrices.

Iron pentacarbonyl is a textbook example of fluxionality. We trap the molecule in cryogenic matrices to study the vibrational dynamics of CO stretching modes involved in the fluxional rearrangement. The infrared spectrum in Ar and N is composed of about ten narrow bands in the spectral range of interest, indicating the population of various lattice sites and a lowering of the molecular symmetry in the trapping sites.

Vibrational spectroscopy and dynamics of W(CO) in solid methane as a probe of lattice properties.

Methane solids present more than one accessible crystalline phase at low temperature at zero pressure. We trap W(CO) in CH and CD matrices between 8 and 35 K to probe the interaction between an impurity and its surrounding molecular solid under various physical conditions. Linear and nonlinear vibrational spectroscopies of W(CO) highlight different kinds of interaction and reveal new and remarkable signatures of the phase transition of methane.

Stimulated emission in cryogenic samples doped with free-base tetraazaporphine.

Thin cryogenic samples of inert gas solids doped with free-base tetraazaporphine (H2TAP) were irradiated with a tunable pulsed laser. Under resonant electronic excitation of the guest, specific vibronic transitions of the fluorescence spectra were found to be strongly enhanced with only a moderate increase of the laser power. This enhancement is due to stimulated emission (SE).

Free base tetraazaporphine isolated in inert gas hosts: matrix influence on its spectroscopic and photochemical properties.

The absorption, fluorescence, and excitation spectra of free base tetraazaporphine (H2TAP) trapped in Ne, N2, and Ar matrices have been recorded at cryogenic temperatures. Normal Raman spectra of H2TAP were recorded in KBr discs and predicted with density functional theory (DFT) using large basis sets calculations. The vibrational frequencies observed in the Raman Spectrum exhibit reasonable agreement with those deduced from the emission spectra, as well as with frequencies predicted from large basis set DFT computations.

[Botulinum A toxin and detrusor sphincter dyssynergia: retrospective study of 47 patients].

Introduction: To assess the efficacy of injections of botulinum toxin type A (BT-A) in the urethral sphincter for treating detrusor sphincter dyssynergia (DSD).

Patients And Methods: Retrospective observational study of patients with confirmed urodynamic DSD (neurological and non-neurological etiologies) treated at our center from 2002 to 2010. All patients received 300 IU of DYSPORT® injected transperineally under electromyographic control.

Vibrational perturbations of W(CO)6 trapped in a molecular lattice probed by linear and nonlinear spectroscopy.

Vibrational dynamics of the T1u CO stretching mode of tungsten hexacarbonyl is explored when the molecule is embedded in a nitrogen matrix at low temperature. Experiments combined infrared (IR) absorption spectroscopy and IR stimulated photon echoes at the femtosecond time scale. W(CO)6 is found to be trapped in two main families of sites differing by their symmetry (called hereafter Oh and D2h sites).

Photolithographic processing of silver loaded dielectric coatings based on preformed colloidal TiO2 nanoparticles dispersed in a mesoporous silica binder.

Titanium dioxide is a well known photocatalyst for reactions involving surface trapped photogenerated carriers. Noble metal photo-reduction may be used for the processing of silver/TiO(2) nanocomposite coatings that may exhibit interesting optical and electrical properties. We present here results of our investigations performed on an original system consisting of preformed colloidal TiO(2) nanoparticles homogeneously dispersed within a mesoporous silica host matrix.

High rotation speed of single molecular microcrystals in an optical trap with elliptically polarized light.

We build an experiment of optical tweezers based on the use of an inverted optical microscope for manipulating microsized single crystals, which are made of an organic dye and parallelepiped in shape. The microcrystals are directed so that their long axis is in the axial direction of the trapping beam. Their short axis follows the direction of the linear polarization of the beam.

What is the place of electroneuromyographic studies in the diagnosis and management of pudendal neuralgia related to entrapment syndrome?

Entrapment of the pudendal nerve may be at the origin of chronic perineal pain. This syndrome must be diagnosed because this can result in the indication of surgical decompression of the entrapped nerve for pain relief. Electroneuromyographic (ENMG) investigation is often performed in this context, based on needle electromyography and the study of sacral reflex and pudendal nerve motor latencies.

Influence of a weak hydrogen bond on vibrational coherence probed by photon echoes in DCl dimer trapped in solid nitrogen.

The dynamics in the ground electronic state of the two intramolecular D-Cl stretching modes of (DCl)2 in nitrogen solid has been probed by degenerate four wave mixing experiments. Accumulated photon echoes on the "free" nu1 and "bonded" nu2 modes have been performed by means of the free electron laser of Orsay (CLIO). The analysis of the time-resolved signals provides information on the various processes responsible for the loss of vibrational coherence, in particular intra- and intermolecular vibrational energy transfer and pure dephasing.

[Abdominal management of rectocele and elytrocele: place of the laparoscopic approach].

Aim Of The Study: To report the results of abdominal promontory rectopexy and douglassectomy in the management of rectocele and enterocele.

Patients And Methods: Between 1992 and 2002, 72 patients were operated by one colorectal surgeon. Laparotomy was used in 37 cases between 1992 and 2001 and the laparoscopic approach in 35 cases from 1995 to 2002.

Time domain investigation on vibrational dephasing and spectral diffusion in CO-doped solid N2.

Infrared picosecond accumulated photon echo experiments have been performed for the first time, using the Orsay Free Electron Laser, on the v = 0-->v = 1 transition of CO in solid nitrogen. The vibrational dephasing time is found to be exceptionally long ( T2>/=120 ns) at low temperature. The analysis of the observed spectral diffusion leads one to assume different energy transfer mechanisms depending on the CO concentration.

[Dyschezia, pudendal neuropathy, and functional pelvico-perineal disorders].

A critical literature review allows an analysis on chronic constipation evaluation and on the association with anatomical or functional pelvic perineal disorders, the link with a pudendal neuropathy being frequent. The dyschezia clinical diagnosis must be completed by X-ray and manometric examinations to well determine the respective part of anatomical and/or functional disturbances. Stretch pudendal neuropathy was first described in association with descending perineum and chronic constipation.

[Rehabilitation during pregnancy and in the postpartum].

Pregnancy and labour are notable etiopathogenic factors concerning urinary incontinence and pelvic positional problems. 30 to 40% of women suffer from incontinence during pregnancy and 20% in the post-partum period. While this incontinence regresses spontaneously in 60 to 80% of cases, it nevertheless reflects the existence of pelviperineal problems.

[Urinary incontinence and prolapse. Medical treatment and functional treatment].

Urinary continence implies that the variations of the vesical pressure does not exceed the capacities of the cervico-urethral closure system. The aim of the various methods of treatment is to have a beneficial action on those two parameters: drug therapy will mainly reduce the intra-vesical pressure (parasympatholytics..

[Giant uterine leiomyoma and pregnancy. Clinical, radiologic, unusual histopathologic aspects].

The authors report a case of uterine leiomyomas diagnosed during the first trimester of pregnancy. The most unusual presentation of this observation did not allow any diagnosis through clinical exam, either by sonographic and X ray technics (magnetic resonance imaging, computer tomography) or by the classical histological study. The intra abdominal tumors compatible with imagery are argued: ovarian cyst, gelatinous disease of the peritoneum, desmoid tumor, lymphoma, lymphangiomyoma.