Telomeres

telomere is a region of repetitive nucleotide sequences at the end of a chromosome, which protects the end of the chromosome from deterioration or from fusion with neighboring chromosomes.Telomere regions deter the degradation of genes near the ends of chromosomes by allowing chromosome ends to shorten, which necessarily occurs during chromosome replication. Over time, due to each cell division, the telomere ends become shorter. (from medical school tumblr)

Large image at nerd-alert.net (link).  FISH detection of telomeres in metaphase human chromosomes (obtained from a lymphocyte), using a telomeric DNA probe. In this image, the telomeres light up yellow, whereas the rest of the chromosome is shown in blue.

 

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Posted in Cells Tagged , , |

James Ensor

James Ensor (1860 – 1949) was a Belgian painter and printmaker, an important influence on expressionism and surrealism who lived in Ostend for almost his entire life. He was associated with the artistic group Les XX.

James Ensor is considered to be an innovator in 19th century art. Although he stood apart from other artists of his time, he significantly influenced such 20th century artists as Paul Klee, Emil Nolde, George Grosz,Alfred Kubin, Wols, Felix Nussbaum, and other expressionist and surrealist painters of the 20th century. (adapted from wikipedia)

Skulls and masks (link)

James Ensor (1860-1949) 
Crânes et Masques (Elesh 29) 
etching, 1888, on simili Japon paper, second, final state, signed, dated and titled in pencil, countersigned in pencil and numbered 16 on the reverse, with wide margins, light staining, otherwise in very good condition
P. 100 x 137 mm., S. 236 x 290 mm. 

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Retinal Implant

Recently, an electronic chip measuring 3mm square was implanted behind the retina of patients left blind by retinitis pigmentosa.

Blind people have described smiles on friendly faces, the food on their plates, and household objects from telephones to dustbins, after surgeons fitted them with electronic chips to partially restore their vision.

Image from theverge.com (link). X-ray of a patient fitted with the retinal implant. A dial on the outside of the head controls brightness levels. Photograph: Robert MacLaren/Oxford Eye Hospital

Results from the first eight patients to enrol in a clinical trial of the retinal implants show that five found the chips improved their eyesight enough to be useful in everyday life.

All those involved – men and women aged 35 to 62 – had lost their sight to retinitis pigmentosa, a hereditary disease that destroys the light-sensitive cells in the eye. The chip stands in for the defunct cells by detecting light rays and converting them into electrical pulses, which are sent along the optic nerve to the brain.

Each patient spent up to 10 hours in surgery to have the 3mm by 3mm chip implanted in one eye. The chip is studded with 1,500 light-sensitive elements that pick up light falling on the macula, the most light-sensitive part of the retina. (from the guardian – link)

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Alveoli SEM

An alveolus (plural: alveoli, from Latin alveolus, “little cavity”) is an anatomical structure that has the form of a hollow cavity. Found in the lung parenchyma, the pulmonary alveoli are the terminal ends of the respiratory tree, which outcrop from either alveolar sacs or alveolar ducts, which are both sites of gas exchange with the blood as well. (from Wikipedia)

Image from post-mitotic tumblr (link). Image by David Gregory and Debbie Marshall

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