sugaratoms:

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This baby, pictured in yellow, is a nucleus. They contain genetic information for every single eukaryotic cell (apart from mitochondrial DNA, and the DNA of chloroplasts).  They are the most conspicuous organelle under the microscope, appearing as a darker, denser area. The nuclear envelope separates the nuclear contents from the cytoplasm. The double membrane (nuclear envelope) is periforated by pores 100nm in diameter. At the lip of each pore, the inner and outer membranes are continous, leaving a space between them of 20-40nm. The inside of the envelope is lined with the nuclear lamina, a netlike array of protein filaments which serve to maintain shape. There is also much evidence for a nuclear matrix within. DNA is present as chromatin or chromosomes in the nucleus, with each species having a characteristic number of chromosomes and genes. A nucleolus is present within the nucleus and is identified as densely stained granules and fibres. The nucleolus synthesises rRBA and studies suggest it also plays a part in is regulation of cellular processes (such as division).

bioguru:

Lovely SEM image of pseudostratified ciliated columnar epithelium. This tissue lines the trachea and upper respiratory tract, and is responsible for sweeping debris out of your lungs, up your wind pipe, and into the back of your throat where you’ll either a) cough it out or b) swallow it. People who are smokers are constantly killing off these cells, which is why smokers are so prone to lung infections; they lack the ciliated cells to keep crap out of their lungs.

fuckyeahmolecularbiology:

Field emission scanning electron microscope image of a human dendritic cell (blue pseudo-color) in close interaction with a lymphocyte (yellow pseudo-color). This contact may lead to the creation of an immunological synapse.

fuckyeahmolecularbiology:

Kupffer cells are specialized macrophages that patrol tiny vessels in the liver called sinusoids, recycling old red blood cells and ingesting pathogens. The endothelium of these vessels is perforated with large holes, allowing the Kupffer cells to migrate into liver tissue at sites of inflammation and damage.

fuckyeahmolecularbiology:

Scanning electron micrograph (SEM) image revealing the biofilm-like structures (dark blue) formed by HTLV-1 particles adhering to the surface of infected T cells (blue) creating a viral synapse with a target cell (yellow).

Image Source: Cell Picture Show.

micro-scopic:

False-colour scanning electron micrograph (SEM) of rod and cone cells of the eye retina. Cone cells (blue) and more numerous rod cells (pink, purple) are specialized light-sensitive cells. They occur on the surface of the retina. They are responsible for detecting visible images, which are transmit- ted as nerve impulses to the optic nerve and the brain. There are about 130 million rod cells in the human retina; they detect light intensity and so are important for day and night vision. While the less numerous cone-like cone cells (about 6.5 million in the human retina) respond specifically to colour. Magnification: x730 at 6x7cm size. Magnification: x1120 at 4x5 inch size.

fuckyeahmolecularbiology:

A false-colour electron micrograph image of a stem cell.

thebioguru:

SEM imaging of an erythrocyte and platelet (formed elements of blood).

This image of warped lung cancer cells is in stark contrast to the healthy lung in the previous picture.

This is what a colour-enhanced image of the inner surface of your lung looks like. The hollow cavities are alveoli; this is where gas exchange occurs with the blood.