Science Source Feb 2010

Transmission electron micrograph of a capillary epithelial junction in the rete mirabile of the gas bladder of the toadfish (Opsanus tau). There are m...

Diagram of a desmosome (macula adherens). A desmosome is a type of junctional complex that is specialized for cell-to-cell adhesion.

Transmission electron micrograph of Sertoli to Sertoli cell junctions (occluding junctions) in guinea pig testis. These cell junctions form a permeabi...

Occluding junctions (or tight junctions) between lateral processes of adjacent Sertoli cells form a permeability barrier that separates the intracellu...

Transmission electron micrographs of portions of the surface of polychromatophilic erythroblasts from guinea pig bone marrow. This series of images il...

Transmission electron micrograph of a macrophage in the interstitium of the testis in an Opossum (Didelphis virginiana). Pinocytosis can been seen as...

Scanning electron micrograph showing cells of peritoneal exudate of mouse. The macrophage (top right) is entirely covered with microvilli and short fo...

SEM of of free surfaces of cultured HeLa cells are seen to be covered by large numbers of long slender mircrovilli. Cultured cells are particlarly use...

This illustration shows how the body increases the available surface area in the intestinal tract without increasing the overall size of the organs. A...

Transmission electron micrograph of a quick-frozen, deeply-etched preparation of skeletal muscle fiber and extracellular components. The upper right p...

Transmission electron micrograph of a quick-frozen, deeply-etched preparation of the sarcolemma of skeletal muscle and its basal lamina. The basal lam...

Transmission electron micrograph of smooth muscle in the wall of a small artery. The muscle is seen in cross section at the center of the image, just...

Transmission electron micrograph of peripheral nerves in the pericardium of a cat. Myelinated nerves surrounded by concentric rings are juxtaposed wit...

Transmission electron micrograph of a nerve in cross-section, showing groups of unmyelinated axons enclosed in deeply invaginated recesses in the surf...

Transmission electron micrograph of the base of the human corneal epithelium. The basal lamina bisects the image, dividing the Bowman's Layer of colla...

Transmission electron micrograph of the intestinal epithelium of a cat. The glycocalyx is visible on the outside of the brush border, but also extends...

Transmission electron micrograph of microvilli on the intestinal absorptive cells of the bat (Myotis lucifugus). The branching filaments of the glycoc...

Transmission electron micrograph of the intestinal epithelium of a cat. The glycocalyx is visible on the outside of the brush border. The brush border...

Transmission electron micrograph of the myelin sheath of a nerve. The parallel lines are the 'major dense lines' of myelin, which act as electrical in...

Transmission electron micrograph of a freeze fracture prepared brush border of a surface columnar cell from human rectal mucosa. The right-hand sectio...

Transmission electron micrograph of a freeze fracture replica of the P-face of the sperm midpiece in an Opossum (Didelphi virginiana).

Transmission electron micrograph of a replica of the P-face of a guinea pig sperm tail. Three highly specialized regions are visible: the middle piece...

Transmission electron micrograph of a freeze fractured preparation of ciliary epithelium in a monkey's eye. The "E Face," (Ectoplasmic) is in the uppe...

Transmission electron micrograph of the intestinal microvilli of a cat. The cross section of each microvillus is bounded by two dense lines of similar...

Fluid-mosaic model of the cell membrane, which envisions a two-dimensional solution of oriented lipids and globular proteins. The lipid bilayer is ass...

Transmission electron micrograph of an acinar cell from the pancreas of the bat (Myotis lucifugus). The sample was fixed in glutaraldehyde and then os...

Mitosis in a roundworm (Ascaris). Mitosis is the process in which a eukaryotic cell separates the chromosomes in its cell nucleus, into two identical...

Transmission electron micrograph of the thick surface membranes and the adjacent rough endoplasmic reticulum of two pancreatic acinar cells from a bat...

A dividing mitochondrion in a cell of a human oncocytoma, a rare benign tumor of the human parotid salivary gland. The mitochondrion is divided into t...

Part of a cross-section of a nerve, with connective tissue, nerve fibers, and myelin sheaths (the darker outlines) produced by Schwann cells. x15,000

Frog eggs (Ovum) in at different stages of growth. Pictured from left to right: 2 cell, 8 cell, 32 cell, late yolk plug, early neural grove.

Normal human, female karyotype. A cell contains 46 chromosomes grouped into 23 pairs. The 23rd pair are the sex chromosomes. Females have two of the s...

Motor neuron of cat's spinal cord

Sickle cell anemia cells. Mag., 1000x. Nomarski interference

Transmission electron micrograph stained with uranyl acetate showing the positive stainong messenger RNA connecting the ribosomes. Ribosomes are compl...

Electron micrograph of a normal artery.

Transmission electron micrograph (TEM) of the tobacco mosaic virus (TMV). Each virus consists of a protein coat with internal RNA genetic material. So...

Micrograph of cilia-ringed sensory papilla of a frog's tongue.

Normal, human male chromosomes. This karyotype shows the 46 chromosomes found in most cell nuclei in a man's body. There are 22 pairs of chromosomes a...

TEM of whole native DNA.

Platinum-shadowed electron micrograph (freeze-fracture TEM) showing characteristic attachment of RNA polymerase molecules to DNA strands. Magnificatio...

Human neuron. Mag. x72

Mouse neuron and spinal cord ganglia. Mag. x1050

Scanning electron micrograph (SEM) of red blood cells. Magnification: x6750 at 5 x 7 inches.

Platinum-shadowed electron micrograph (freeze-fracture TEM) of rabbit reticulocyte polyribosomes active in hemoglobin synthesis. Reticulocytes are imm...

Scanning electron micrograph (SEM) of normal red blood cells. Bioconcave discs (donut forms) predominate. Mag. x3333.

Scanning electron micrograph (SEM) of the sickled cells caused by Sickle- Cell Anemia.

Cat soleus muscle. Capillary between two muscle fibers. Four deformed erythrocytes (red blood cells) are in the capillary lumen. Vesiculation of the e...

Electron micrograph of myelinated axon. Mag., 15,000x

Electron micrograph of a cell in the actively dividing root tip of maize. Several clumps of Golgi membranes can be seen above the nucleus, with a plas...