منابع مشابه
Ultraviolet Radiation Effects on Ehrlich Ascites Tumor Cells Observations Using a Flying Spot Ultraviolet Microscope*
A flying spot ultraviolet microscope, employing a fast scan and pulsed operation of the raster, has been used to induce radiation damage in ascites tumor slide cultures, and to study by time-lapse cinematography the progressive stages of cell damage. The cells observed came from a strain (EFT) of the Ehrlich ascites carcinoma. Irradiated cells were found to show a characteristic syndrome of dam...
متن کاملNear-field optical microscope based on local perturbation of a diffraction spot.
Using a vibrating opaque metallic tip, which periodically and locally modif ies the electromagnetic f ield distribution of a diffraction spot focused onto a sample surface through a microscope objective lens, we have observed optical resolution better than the diffraction limit both with topographical features and with purely optical ones. This procedure simultaneously generates a ref lection-m...
متن کاملFlying Laser Spot Thermal Wave Ir Imaging of Horizontal and Vertical Cracks
As an extension of the work of Kuo et al[l], we have developed a "Flying-Spot" lasersource/IR-detector camera in which the focal point of an unmodulated heating laser is moved at constant velocity across the sample while the image point of an IR detector is scanned at the same speed at a point just behind the laser beam. The detector is thus looking at the "thermal wake" of the heated spot. The...
متن کاملFlying Laser Spot Thermography for the Fast Detection of Surface Breaking Cracks
We report on recent developments in the detection of surface breaking cracks using flying laser spot thermography. Application of an infrared camera for mapping the thermal radiation after excitation with a diode laser equipped with an optical scanner allows us to examine a surface containing cracks in an entirely non-destructive, contactless and fast way, without even moving the camera. We dev...
متن کاملNot flying blind: a comparative study of photoreceptor function in flying and non-flying cockroaches.
Flying is often associated with superior visual performance, as good vision is crucial for detection and implementation of rapid visually guided aerial movements. To understand the evolution of insect visual systems it is therefore important to compare phylogenetically related species with different investments in flight capability. Here, we describe and compare morphological and electrophysiol...
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ژورنال
عنوان ژورنال: Nature
سال: 1951
ISSN: 0028-0836,1476-4687
DOI: 10.1038/167231a0