Aromatic retinoid--oral photochemotherapy (RePUVA) for actinic reticuloid

RePUVA treatment proved to be more efficient than simple oral photochemotherapy in a patient suffering from actinic reticuloid. This combined therapy may solve some problems of long-term treatment in actinic reticuloid.     

Adherence to guidelines for the prevention of HIV-related respiratory diseases

In this study we characterized the pattern of use of preventive therapies for specific respiratory diseases within a cohort of homosexual men and assessed the impact of targeted feedback on the level of compliance with guidelines for these diseases. All human immunodeficiency virus seronegative (HIV-) (n=169) and acquired immune deficiency syndrome (AIDS)-free human immunodeficiency virus seropositive (HIV+) (n=154) participants in our cohort, who completed four annual visits between October 1989 and December 1993, were identified. Information about the use of purified protein derivative (PPD) (tuberculin) testing, history of pneumococcal vaccinations, influenza vaccinations, use of Pneumocystis carinii pneumonia (PCP) prophylaxis, symptoms and CD4 counts was obtained yearly for each subject. In 1992, participating physicians were provided with feedback regarding the overall levels of compliance with contemporary guidelines for the prevention of respiratory disease. As part of this exercise, the guidelines were distributed and discussed. The percentage of HIV+ patients who underwent PPD testing increased from 43 to 65% during the study (p=0.001). Significantly more HIV+ than HIV- patients underwent PPD testing (p<0.001). A total of 144 (94%) HIV+ men received at least one influenza vaccination compared to 60 (35%) HIV- men (p<0.001). Utilization of influenza vaccination in the HIV+ group significantly increased from 78% in 1992 to 92% in 1993 (p<0.001). A total of 104 (68%) HIV+ men received pneumococcal vaccination compared to 2 (1%) HIV- men (p<0.001). Among HIV+ individuals whose absolute CD4+ count was less than 200 cells x mm(-3), the percentage of men who received primary PCP prophylaxis was 0, 86, 72 and 88 for the years 1990-1993, respectively. Among HIV+ patients whose only eligibility criterion for PCP prophylaxis was a CD4+ percentage <20%, compliance was 55, 30, 37 and 50% for the years 1990-1993, respectively. Among HIV+ subjects, increases in the compliance level were noted for all preventive therapies after targeted feedback was provided during the last quarter of 1992. However, only utilization of influenza vaccine exceeded a 90% compliance in 1993. These data demonstrate that a suboptimal level of compliance with current guidelines for the prevention of respiratory disease among human immunodeficiency virus-infected individuals can be significantly improved using targeted feedback. Although it is likely that similar effects could be achieved in other populations or the community at large, this remains to be demonstrated.     

NanoPaint: A Tool for Rapid and Dynamic Imaging of Membrane Structural Plasticity at the Nanoscale

Single‐particle tracking with quantum dots (QDs) constitutes a powerful tool to track the nanoscopic dynamics of individual cell membrane components unveiling their membrane diffusion characteristics. Here, the nano‐resolved population dynamics of QDs is exploited to reconstruct the topography and structural changes of the cell membrane surface with high temporal and spatial resolution. For this proof‐of‐concept study, bright, small, and stable biofunctional QD nanoconstructs are utilized recognizing the endogenous neuronal cannabinoid receptor 1, a highly expressed and fast‐diffusing membrane protein, together with a commercial point‐localization microscope. Rapid QD diffusion on the axonal plasma membrane of cultured hippocampal neurons allows precise reconstruction of the membrane surface in less than 1 min with a spatial resolution of tens of nanometers. Access of the QD nanoconstructs to the synaptic cleft enables rapid 3D topological reconstruction of the entire presynaptic component. Successful reconstruction of membrane nano‐topology and deformation at the second time‐scale is also demonstrated for HEK293 cell filopodia and axons. Named “nanoPaint,” this super‐resolution imaging technique amenable to any endogenous transmembrane target represents a versatile platform to rapidly and accurately reconstruct the cell membrane nano‐topography, thereby enabling the study of the rapid dynamic phenomena involved in neuronal membrane plasticity.     

Reorganization of the Brain Extracellular Matrix in Hippocampal Sclerosis

The extracellular matrix (ECM) is an important regulator of excitability and synaptic plasticity, especially in its highly condensed form, the perineuronal nets (PNN). In patients with drug-resistant mesial temporal lobe epilepsy (MTLE), hippocampal sclerosis type 1 (HS1) is the most common histopathological finding. This study aimed to evaluate the ECM profile of HS1 in surgically treated drug-resistant patients with MTLE in correlation to clinical findings. Hippocampal sections were immunohistochemically stained for aggrecan, neurocan, versican, chondroitin-sulfate (CS56), fibronectin, Wisteria floribunda agglutinin (WFA), a nuclear neuronal marker (NeuN), parvalbumin (PV), and glial-fibrillary-acidic-protein (GFAP). In HS1, besides the reduced number of neurons and astrogliosis, we found a significantly changed expression pattern of versican, neurocan, aggrecan, WFA-specific glycosylation, and a reduced number of PNNs. Patients with a lower number of epileptic episodes had a less intense diffuse WFA staining in Cornu Ammonis (CA) fields. Our findings suggest that PNN reduction, changed ECM protein, and glycosylation expression pattern in HS1 might be involved in the pathogenesis and persistence of drug-resistant MTLE by contributing to the increase of CA pyramidal neurons’ excitability. This research corroborates the validity of ECM molecules and their modulators as a potential target for the development of new therapeutic approaches to drug-resistant epilepsy.     

High-resolution inversion of ultrasonic traces

An algorithm for estimating the acoustic reflection coefficient profile from ultrasonic traces obtained during inspection of layered materials is described. Given the measured trace and the incident wavelet, the inversion proceeds by means of a layer stripping approach combined with high-resolution deconvolution. The inversion algorithm is stable to noise and is suitable for use with bandlimited data. It is particularly suitable for use with materials that exhibit a few large discontinuities in impedance and in which multiple reflections in the data are evident. The performance of the algorithm is illustrated in tests with synthetic and real data. An implementation of the algorithm on a TMS 320C30 signal processing board allowed the inversion of an entire set of 256 traces, each of 256 elements, in 15 s.     

Curvilinear Mesh Adaptation Using Radial Basis Function Interpolation and Smoothing

We present a new iterative technique based on radial basis function (RBF) interpolation and smoothing for the generation and smoothing of curvilinear meshes from straight-sided or other curvilinear meshes. Our technique approximates the coordinate deformation maps in both the interior and boundary of the curvilinear output mesh by using only scattered nodes on the boundary of the input mesh as data sites in an interpolation problem. Our technique produces high-quality meshes in the deformed domain even when the deformation maps are singular due to a new iterative algorithm based on modification of the RBF shape parameter. Due to the use of RBF interpolation, our technique is applicable to both 2D and 3D curvilinear mesh generation without significant modification.