Science Stock Photography
Scientific stock photography library of light microscope pictures and electron microscopy images featuring science and biomedical microscopy photos
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Caffeine crystals. Caffeine is an alkaloid found naturally in such foods as coffee beans, tea, kola nuts and cacao beans. Caffeine has a characteristic bitter taste. Its main pharmacological properties are: a stimulant action on the central nervous system with psychotropic effects and stimulation of respiration, a stimulation of the heart rate, and a diuretic effect. Caffeine is a drug and consumption leads to pharmacologic tolerance with defined withdrawal symptoms.
| 880328-03.tif 12.01.04 crystal crystals caffeine psychotropic effects respiratory stimulant stimulant drug heart rate increase heart rate stimulant nervous system stimulant alkaloid coffee bean coffee beans tea diuretic effect LM |
• Scientific Image Library – over 4,400 light microscopy and electron microscopy images of Algae, Arachnids, Bacteria, Crystals, Fungi, Insects, Invertebrates, Medical, Miscellaneous, Plants, Protozoa, Vertebrates, and Viruses. Biological, medical and general sciences images are available for licensed, rights-managed, non-exclusive use.
• Contact us if you can't find an image. Our archives contain thousands of black & white micrographs (colorizations available).
• Assignment Photography – Contact us for custom scientific imaging of samples and products. Dennis Kunkel Ph.D has over 35 years of microscopy expertise in biological and medical sciences.
Dennis Kunkel Microscopy, Inc. is a scientific stock photography agency (science stock photography, science stock photographs / pictures) featuring biology, medical and biomedical microscopy photos / pictures taken with light microscopes (LM) and electron microscopes (transmission electron microscope - TEM; scanning electron microscope - SEM). Microscopy photographs (science images, electron microscope images, photomicrographs, microscopy photos, microscope photos, microscopic pictures) are available for use in editorial and commercial formats. Image categories include Algae, Arachnids, Bacteria, Crystals, Fungi, Insects, Invertebrates, Medical, Miscellaneous, Plants, Protozoa, Vertebrates and Viruses.
Copyright © 2013 Dennis Kunkel Microscopy, Inc. and other copyright holders. All rights reserved, protected under U.S. Copyright. No images or graphics on this site may be used without written permission of their respective owners. For licensing, contact Dennis Kunkel (scientific stock photography, science images, science stock photography, electron microscopy images, biomedical microscopy photos, microscopic pictures, microscope photos).