Microscopy

Ultrafast Electron Microscopy has been demonstrated to be an effective table-top technique for imaging the temporally-evolving dynamics of matter with subparticle spatial resolution on the time scale of atomic motion. A stringent enhancement of the UEM temporal resolution is demanded for recording snapshots of the electron motion which will provide a real-time access to all microscopic motions outside the atomic core and radically change our insight into the workings of the microcosm. Here, we…

Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) are two very widespread techniques for examining various properties of substances in many fields of study. These fields can range from biology to chemistry to geology and several others (5). Both work by using the electromagnetic properties of the ways that electrons travel and interact with other atoms. Because electrons have a shorter wavelength of motion and a much higher energy than light, electron microscopy has a…

Using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) images and spectra were obtained from various samples of silica and platinum on silica. Each sample contains unique structures which were prepared by etching the surface of silica in different conditions. A scanning electron microscope is a type of electron microscope that produces images of topography and composition by scanning a sample with a focused beam of electrons. Samples can be observed in high vacuum,…

In this study, the effect of benzenethiol ligand on CdSe/ZnS core/shell quantum dots was investigated. Conventional long-chain oleic acid (OA) and trioctylphosphine (TOP) capping ligands were partially replaced by short benzenethiol ligands, and the improvement in the luminescence performance was observed in quantum dot light emitting diodes (QD-LED). Approximately 1.8 fold improvement was achieved for both the maximum luminance and maximum current efficiency for the QD-LEDs fabricated with…

The development of advanced microscopes has enabled scientists to further their investigation on the criteria for life. As a result, biologists have been confronted with a baffling question: is there a size limit on life? If so, then just how small can something be before it can no longer be considered alive? Ever since the discovery of nano-sized particles called “nanobacteria” or “nanobes”, researchers have been scrambling to unravel and analyze the mysterious functions of these purported…

The carbon supported PtFeS catalysts were prepared by a modified polyol method. In brief, 0.3 g carbon (Ketjen-black heat-treated at 2250 °C, SE = 160 m2 g-1) was dispersed in 135 g ethylene glycol. 5.993 g of 8 wt% H2PtCl6 (Umicore; Pt content, 39.8 wt%), 1.874 g of 8 wt% FeCl3. 6H2O (Sigma-Aldrich), and 0.352 g of 8 wt% (NH2)2SC (Sigma-Aldrich) previously mixed in ethylene glycol were added to the dispersion. The pH of the stirred reaction mixture was adjusted to ∼11 using 1 M NaOH dissolved…

INTRODUCTION : The concept of dentin adhesion presently used involves the nanomechanical retention which is due to polymerisation of hydrophilic monomers around acid exposed collagen fibres.1 The entanglement of these monomers within the exposed collagen fibres gives rise to the so called Hybrid layer , which is also referred as Resin infiltrated Dentin layer.2 The presence of hybrid layer is important for attainment of a leakage free interface between the cavity walls and resin composite.2…

lesions. Segmental is defined as a glomerular lesion involving less than half of the glomerular tuft. Class V Membranous Lupus Nephritis Global or segmental subepithelial immune deposits, or their morphologic sequelae by light microscopy and by immunofluorescence or electron microscopy, with or without mesangial alterations Class V may occur with class 3 or class 4 in which case both are…

Electron motion in atomic systems, which happens on timescales of attoseconds, is at the heart of all phenomena in nature (except for nuclear processes). Electron motion is responsible for the emission of light and photosynthesis in plants. Electron motion across biological molecules transports information in our nerves and is involved in processing this information in our brains. Moreover, the valence electrons are responsible for binding atoms to form molecules. The structural change of…

Transient neonatal myasthenia gravis is a human model of passively transferred MG. I a study conducted by Tzartos, S. J., Efthimiadis, A., Morel, E., Eymard, B., & Bach, J. (1990), fine antigenic specificities of anti-AChR antibodies in sera from 21 MG mothers and 17 of their infants were studied (nine of which had transiently transferred the disease). Although in a few cases significant differences in antibody specificities were observed between mothers and infants, whether myasthenic or not,…