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Here we see the many layers of nerve cells in the retina of a ground squirrel. The top layer (green) is made up of cells called photoreceptors. These cells convert light into electrical signals that travel to the brain. The two best-known types of photoreceptors are rod and cone cells. Rods help us see under low-light conditions, and cones allow us to see vibrant colors in daylight.

The Fireworks Inside Us All

Here we see the many layers of nerve cells in the retina of a ground squirrel. The top layer (green) is made up of cells called photoreceptors. These cells convert light into electrical signals that travel to the brain. The two best-known types of photoreceptors are rod and cone cells. Rods help us see under low-light conditions, and cones allow us to see vibrant colors in daylight.

Specimen: Lymphatic endothelial cells and fibroblasts coated on cytodex beads and seeded in 3D fibrin gels (200x)  Technique: Fluorescence and Confocal

Specimen: Lymphatic endothelial cells and fibroblasts coated on cytodex beads and seeded in 3D fibrin gels (200x) Technique: Fluorescence and Confocal

Axones nerviosos - A cross section of a bundle of nerve fibers.  Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells.  Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.

Axones nerviosos - A cross section of a bundle of nerve fibers. Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells. Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.

Cross-section of the esophagus showing, from the central region outward, the lumen, mucosa, submucosa, a muscularis externa, and a thin adventia or serosa. SEM X60

Cross-section of the esophagus showing, from the central region outward, the lumen, mucosa, submucosa, a muscularis externa, and a thin adventia or serosa. SEM X60

Een scanning elektronen microscopisch beeld van HIV.  De glycoproteïne complex op het oppervlak maakt het virus te hechten aan en zekering door doelcellen om de infectieuze cyclus starten.

Een scanning elektronen microscopisch beeld van HIV. De glycoproteïne complex op het oppervlak maakt het virus te hechten aan en zekering door doelcellen om de infectieuze cyclus starten.

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