A stand-alone, interactive computer system has been developed that automates the analysis of ethidium bromide-stained agarose and acrylamide gels on which DNA restriction fragments have been separated by size. High-resolution digital images of the gels are obtained using a camera that contains a one-dimensional, 2048-pixel photodiode array that is mechanically translated through 2048 discrete steps in a direction perpendicular to the gel lanes. An automatic band-detection algorithm is used to establish the positions of the gel bands. A color-video graphics system, on which both the gel image and a variety of operator-controlled overlays are displayed, allows the operator to visualize and interact with critical stages of the analysis. The principal interactive steps involve defining the regions of the image that are to be analyzed and editing the results of the band-detection process. The system produces a machine-readable output file that contains the positions, intensities, and descriptive classifications of all the bands, as well as documentary information about the experiment. This file is normally further processed on a larger computer to obtain fragment-size assignments.
Structural imaging of myelin is of utmost importance for characterization of pathological changes to the brain in neurological disorders. Birefringence microscopy is used for rapid visualization of structural changes to myelin at sub-micron (<300nm) resolution.
Birefringence microscopy is a valuable technique for label-free imaging of myelin structure in fixed brain sections. We demonstrate the ability to use high-resolution birefringence microscopy to study the grid-like structure of the human brain.
The digital root of a number is found by adding its digits, then adding the digits of the result, and so on, until a single digit is obtained. For example: 142857-»27->9. Most readers will be aware that the digital root is equivalent to the starting number modulo 9. Recently I computed the digital roots of the recurring parts of the decimal representations of prime reciprocals (Table 1). Prime Reciprocal as a decimal Digital
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.