Produced by the National Institute of Allergy and Infectious Diseases (NIAID), under a magnification of 25,000X, this digitally-colorized scanning electron microscopic (SEM) image depicts numerous filamentous Ebola virus particles (blue) budding from a chronically-infected VERO E6 cell (yellow-green).
Ebola is one of numerous Viral Hemorrhagic Fevers. It is a severe, often fatal disease in humans and nonhuman primates (such as monkeys, gorillas, and chimpanzees).
Ebola is caused by infection with a virus of the family Filoviridae, genus Ebolavirus. When infection occurs, symptoms usually begin abruptly. The first Ebolavirus species was discovered in 1976 in what is now the Democratic Republic of the Congo near the Ebola River. Since then, outbreaks have appeared sporadically. See the Flickr link for additional SEM NIAID Ebola virus imagery.
Produced by the National Institute of Allergy and Infectious Diseases (NIAID), this digitally-colorized scanning electron microscopic (SEM) image of a dry-fractured Vero cell revealed its contents, and the ultrastructural details at the site of an opened vacuole, inside of which you can see numerous Coxiella burnetii bacteria undergoing rapid replication. Please see the Flickr link below for additional NIAID photomicrographs of various microbes.
Infection of humans by Coxiella burnetii bacteria usually occurs by inhalation of these organisms from air that contains airborne barnyard dust contaminated by dried placental material, birth fluids, and excreta of infected animals. Other modes of transmission to humans, including tick bites, ingestion of unpasteurized milk or dairy products, and human to human transmission, are rare. Humans are often very susceptible to the disease, and very few organisms may be required to cause infection.
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Placoid scales aka dermal denticles are found in cartilaginous fishes such as sharks, rays, and chimaeras.
They are also structurally homologous with vertebrate teeth (“denticle” translates to “small tooth”), having a central pulp cavity supplied with blood vessels, surrounded by a conical layer of dentine, all of which sits on top of a rectangular basal plate that rests on the dermis.
The shape of denticles is specific to individual species and cannot grow in size, but rather more scales are added as the fish increases in size.
SEM image of Banded Wobbegong Shark (Orectolobus ornatus), Brier Shark (Deania calcea), Tiger Shark (Galeocerdo cuvier) and Gummy Shark (Mustelus antarctius) denticles.
Muitas pessoas tem dúvidas em questão de tags e como modificar um theme, e as vezes até muita vontade de aprender a fazer themes ou até mesmo editá-los. Porém com pequenos tutoriais espalhados pelos tumblrs, surgem as dificuldades. Não é difícil fazer um theme, é preciso gostar, querer aprender, e prestar bastante atenção.
Para essas pessoas, eu vou ensiná-las a fazer um theme do zero, explicando as tags necessárias e os recursos usados.
The picture above doesn’t show two crossed optical fibers like those used in telecommunications, where a source at the end of the cable sends light careening through it. Instead, these glowing blue and yellow fibers are actually generating their own light.
The material, called polymer light-emitting photochemical cells (PLEC), efficiently converts electrons to photons throughout the length of the fiber while operating on little power. They might one day be woven into clothing or other products to make new types of fashion or wearable, bendable displays. Imagine your smartphone on your shirtsleeve.
(The letter “A” made from fiber-shaped polymer light-emitting electrochemical cells [PLECs]. Courtesy Zhang et al./Nature Photonics.)