Publications

OBJECTIVES: This study aimed to investigate mitral annular dynamics in atrial fibrillation (AF) and after sinus rhythm restoration, and to assess the relationship between annular dynamics and mitral regurgitation (MR). BACKGROUND: AF can be associated with MR that improves after sinus rhythm restoration. Mechanisms underlying this atrial functional MR (AFMR) are ill-understood and generally attributed to left atrial remodeling. METHODS: ...

In order to increase the sustainability of metals, a more detailed understanding of the corrosion process is of crucial importance. Current literature often considers corrosion as a purely chemical interaction with a nearly exclusive dependence on compositional effects, while ignoring microstructural and crystallographic properties of the metal surface. Some recent literature data, however, suggest an important effect of microstructural elements ...

Fabrication of micro/nanostructures on difficult-to-cut materials is still a challenge and availability of fabrication technologies outside cleanroom is limited. The trend for tip-based nanomanufacturing has attracted research interest as a potential method to address this challenge. Atomic force microscope (AFM) tip based scratching and nanoindentation are steps in this direction. Electrochemical machining (ECM) has the potential to be ...

Standard optical imaging is diffraction-limited and lacks the resolving power to visualize many of the organelles and proteins found within the cell. The advent of super-resolution techniques overcame this barrier, enabling observation of subcellular structures down to tens of nanometers in size; however these techniques require or are typically applied to fixed samples. This raises the question of how well a fixed-cell image represents the ...

Cable bacteria are electroactive bacteria that form a long, linear chain of ridged cylindrical cells. These filamentous bacteria conduct centimeter-scale long-range electron transport through parallel, interconnected conductive pathways of which the detailed chemical and electrical properties are still unclear. Here, we combine time-of-flight secondary-ion mass spectrometry (ToF-SIMS) and atomic force microscopy (AFM) to investigate the ...

Multimodal imaging and spectroscopy like concurrent scanning transmission X-ray microscopy (STXM) and X-ray fluorescence (XRF) are highly desirable as they allow retrieving complementary information. This paper reports on the design, development, integration and field testing of a novel in situ atomic force microscopy (AFM) instrument for operation under high vacuum in a synchrotron soft X-ray microscopy STXM-XRF end-station. A combination of mu ...

In parallel with the development of nanoparticle coatings for protection of paper substrates, detailed descriptions of the surface topography with micro-to nanoscale roughness features are needed. In this work, papers have been coated with poly(styrene-co-maleic anhydride) nanoparticles including different types of vegetable oils and the surface roughness was evaluated at 2000 x 2000 mu m(2) to 0.2 x 0.2 mu m(2) length scales by combining ...

Self assembled monolayers derived from amino silane precursors (C 11 NH 2 ) are studied using conductive AFM (C-AFM) technique in high vacuum (HV) conditions (∼5 × 10 -5 torr). Working in HV condition was preferred to working in air in order to reduce the impact of water meniscus on the surface which increases the adhesion forces causing smearing of the SAMs. C-AFM current maps of these samples indicate a decrease in the number of leakage spots ...