1,721,654 research outputs found
An annotated list of the species of lice (Insecta: Phthiraptera) described by Mohammad A.-R. Ansari
No full textNaz, Saima, Najer, Tomas, Gustafsson, Daniel R. (2020): An annotated list of the species of lice (Insecta: Phthiraptera) described by Mohammad A.-R. Ansari. Zootaxa 4809 (3): 401-448, DOI: 10.11646/zootaxa.4809.3.
FIGURE 1. Mohammad A.-R in An annotated list of the species of lice (Insecta: Phthiraptera) described by Mohammad A.-R. Ansari
No full textFIGURE 1. Mohammad A.-R. Ansari and Theresa Clay at the back entrance of the British Museum (Natural History) London, 1950's. Phthiraptera.info—http://phthiraptera.info/file/1531Published as part of Naz, Saima, Najer, Tomas & Gustafsson, Daniel R., 2020, An annotated list of the species of lice (Insecta: Phthiraptera) described by Mohammad A.-R. Ansari, pp. 401-448 in Zootaxa 4809 (3) on page 403, DOI: 10.11646/zootaxa.4809.3.1, http://zenodo.org/record/393675
Noninvasive Measurements of Glucose in the Human Body Using Polarimetry and Brewster Reflection off of the Eye Lens
No full textNoninvasive Measurements of Glucose in the Human Body Using Polarimetry and Brewster Reflection off of the Eye Len
Method and Apparatus for Non-invasive Measurements of Blood-glucose Levels in Humans
No full textAn apparatus (10) for determining a diagnostic glucose level in a human subject includes a light source (30) that produces collimated light at a selected wavelength. The collimated light is arranged such that it passes through a portion of an eye (12) of the subject and reflects off an eye lens (16) at a selected angle (.theta..sub.B) as reflected light. A polarization analyzer (70) measures a polarization of the reflected light that exits the eye (12). A path length processor (68) determines an optical path length (L.sub..lambda.) of the reflected light within an aqueous humor (22) of the eye (12). A glucose level processor (90) computes a glucose concentration based on the measured polarization and the determined optical path length (L.sub..lambda.)
Simulation of optical path and volume-under-test calculation in an integrated dynamic light scattering and autofluorescence device
No full textWe have developed a non-invasive diagnostic instrument based on a scanning fluorophotometer integrating autofluorescence and dynamic light scattering techniques. The device makes a scan along the optical axis of the eye. In a DLS measurement, it is extremely important to precisely define the position of the volume-under-test inside the eye and its effective volume. In this work, a specific optical computer aided design tool based on the Navarro's model of the human eye is used to simulate the optical path of the DLS laser beams and to calculate position and size of the volume-under-test
Celestial and terrestial tele-ophthalmology: A Health Monitoring Helmet for Astronaut/Cosmonaut and General Public Use
No full textA goggles-like head-mounted device equipped with several non-invasive techniques for quantitative medical evaluation of the eye, skin, and brain is envisioned for monitoring the health of astronauts and cosmonauts during long-term space travel and exploration. Real-time non-invasive evaluation of the different structures within these organs will provide indices of the health of these organs, as well as the entire body. The techniques such as dynamic light scattering (for the early detection of cataracts to evaluate effects of cosmic radiation), corneal autofluorescence (to assess extracellular matrix biology (e.g., diabetes), optical polarization (of aqueous fluid to evaluate serum chemistry), laser Doppler velocimetry (of retinal, optic nerve, and choroidal blood flow to assess ocular as well as central nervous system blood flow), reflectometry/oximetry (for oxygen metabolism), optical coherence tomography (for retinal microstructure), and possibility scanning laser technology for intraocular imaging and scanning will be integrated into this compact device
Design and performance of an ophthalmic instrument for dynamic light scattering and fluorescence measurements in ocular tissues
No full textThe paper describes an ophthalmic instrument designed to perform in-vivo dynamic light scattering and autofluorescence measurements on ocular tissues. We modified a commercial scanning ocular fluorometer, to include both techniques in the same scanning unit. The resulting optical system provides both dynamic light scattering and autofluorescence measurements from the same ocular volume, which can be located in each section of the ocular axis from the cornea to the retina. In this paper, the instrument is described and in-vitro/in-vivo measurements are presented
New optical scheme for a polarimetric-based glucose sensor
Full text linkA new optical scheme to detect glucose concentration in the aqueous humor of the eye is presented. The ultimate aim is to apply this technique in designing a new instrument for, routinely and frequently, noninvasively monitoring blood glucose levels in diabetic patients without contact (no index matching) between the eye and the instrument. The optical scheme exploits the Brewster reflection of circularly polarized light off of the lens of the eye. Theoretically, this reflected linearly polarized light on its way to the detector is expected to rotate its state of polarization, owing to the presence of glucose molecules in the aqueous humor of a patient's eye. An experimental laboratory setup based on this scheme was designed and tested by measuring a range of known concentrations of glucose solutions dissolved in water. (C) 2004 Society of Photo-Optical Instrumentation Engineers
- …
