|
||||
Advanced Condenser Systems: Abbe CondensersBeta-Carotene CrystallitesThe images below compare performance of the Intel Play QX3 Computer Microscope with and without the aid of an organized cone of illumination from a simple two-lens Abbe substage condenser containing an aperture diaphragm. These photomicrographs are unretouched and were captured with the QX3 interactive software. Beta-carotene is the pigment that gives carrots, sweet potatoes, and other yellow vegetables their characteristic coloring. This conjugated polyene also serves as a precursor that can be enzymatically converted into vitamin A in most animals and man. Although vitamin A is not present in any plants, the carotene precursor can be found in carrots, pumpkins, spinach, squash, watermelon, asparagus, broccoli, and cantaloupe. Liver is also a very good source for beta-carotene. Vitamin A (retinol) is an essential component for vision and it promotes bone growth, tooth development, and helps maintain healthy skin, hair, and mucous membranes. Deficiencies of vitamin A result in a number of maladies including night blindness, dry skin, poor bone growth, weak tooth enamel, and weight loss. Birefringent beta - Carotene CrystallitesThe images above were recorded using the Intel Play QX3 microscope in transmitted brightfield mode equipped with crossed polarizers and a full-wave retardation plate. On the top is a digital image from a stock QX3 microscope using auxiliary illumination provided by a fiber optic light pipe through a hole drilled into the mixing chamber. The image on the bottom was recorded using the QX3 microscope body and a simple two-lens Abbe low numerical aperture substage condenser. BACK TO ABBE CONDENSER POLARIZED GALLERY Questions or comments? Send us an email.© 1995-2022 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, software, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
|