February 21, 2011
Mars-500 is a multi-part ground-based experiment simulating a manned flight to Mars. The experiment’s facility is located at the Russian Academy of Sciences’ Institute of Biomedical Problems (IBMP) in Moscow, Russia. A total of 640 experiment days have been scheduled, divided into three stages. During each stage, a crew of six volunteers live and work in a mockup spacecraft. Communication with the outside world is limited, and has a simulated 20 minute delay. The supply of on-board consumables is limited.
The longest stage of the experiment is intended to simulate a complete 520-day mission to Mars, and began on June 3, 2010.
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February 17, 2011
An ultramarathon is any sporting event involving running longer than the traditional marathon length. There are two types of ultramarathon events: those that cover a specified distance, and events that take place during specified time (with the winner covering the most distance in that time). The most common distances are 50 km, 100 km, 50 mi, and 100 miles. Other distances/times include double marathons, 24-hour races, and multiday races of 1000 miles or even longer. The format of these events and the courses vary, ranging from single or multiple loops (some as short as a 400-meter track), to point-to-point road or trail races, to cross-country rogaines.
Many ultramarathons, especially trail challenges, have severe course obstacles, such as inclement weather, elevation change, or rugged terrain. Many of these races are run on dirt roads or mountain paths, though some are run on paved roads as well. Usually, there are aid stations every 5 to 15 km apart, where runners can replenish food and drink supplies or take a short break. Timed events range from 6, 12, and 24 hours to 3 and 6 days (known as multi-day events). Timed events are generally run on a track or a short road course, often one mile or less.
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February 14, 2011
Phineas P. Gage (1823 – 1860) was an American railroad construction foreman now remembered for his improbable survival of an accident in which a large iron rod was driven completely through his head, destroying much of his brain’s left frontal lobe, and for that injury’s reported effects on his personality and behavior—effects so profound that friends saw him as ‘no longer Gage.’
Long called ‘the American Crowbar Case, Phineas Gage influenced 19th-century discussion about the brain, particularly debate on cerebral localization (determination of areas of the cortex involved in performance of certain functions) and was perhaps the first case suggesting that damage to specific regions of the brain might affect personality and behavior.
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February 13, 2011
Tilapia [tuh-lah-pee-uh] is the common name for nearly a hundred species of fish. Tilapia inhabit a variety of fresh water habitats including shallow streams, ponds, rivers and lakes. Historically they have been of major importance in artisan fishing in Africa and the Middle East, and are of increasing importance in aquaculture. China is the largest Tilapia producer in the world, followed by Egypt.
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February 13, 2011
The escolar [es-kuh-lahr] is a species of fish found in deep tropical and temperate waters around the world. It is also known as Snake Mackerel, and sometimes marketed as ‘butterfish,’ ‘oilfish,’ ‘white tuna,’ ‘walu,’ or ‘codfish,’ a controversial practice due to potential health problems related with consumption of the fish. Like its relative the oilfish, escolar cannot metabolize the wax esters naturally found in its diet. This gives the escolar an oil content of 14–25% in its flesh. These wax esters may cause gastrointestinal distress in humans called ‘steatorrhea,’ the onset of which may occur between 30 minutes and 36 hours following consumption.
Symptoms may include stomach cramps, bright orange oil in stool, diarrhea, headaches, nausea, vomiting, and anal leakage. Because of the possible effects of consumption, escolar has been banned from consumption in Japan since 1977, as the Japanese government considers it toxic. It has also been banned in Italy. In 1999, the Swedish and Danish National Food Administrations informed fish trade associations and fish importing companies about the problems escolar and related fish could cause if not prepared properly and issued recommendations.
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February 12, 2011
Paranasal sinuses are air-filled spaces, communicating with the nasal cavity, within the bones of the skull and face. Humans possess a number of paranasal sinuses, divided into subgroups that are named according to the bones within which the sinuses lie. Paranasal sinuses occur in a variety of animals (including most mammals, birds, non-avian dinosaurs, and crocodilians). The biological role of the sinuses is debated, but a number of possible functions have been proposed such as decreasing the relative weight of the front of the skull, and especially the bones of the face; increasing resonance of the voice; and providing a buffer against blows to the face.
It has also been suggested they insulate sensitive structures like dental roots and eyes from rapid temperature fluctuations in the nasal cavity, and also serve to humidify and heat inhaled air. The paranasal sinuses are joined to the nasal cavity via small orifices called ostia. These become blocked easily by allergic inflammation, or by swelling in the nasal lining which occurs with a cold. If this happens, normal drainage of mucus within the sinuses is disrupted, and sinusitis may occur. These conditions may be treated with drugs such as pseudoephedrine, which causes vasoconstriction in the sinuses, reducing inflammation, by traditional techniques of nasal irrigation, or by corticosteroid.
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February 12, 2011
A neti pot is a device used for irrigating the nasal passages. Typically it has a spout attached near the bottom, sometimes with a handle on the opposite side. Neti pots flush out the nasal cavities by using gravity to draw the flow of saline. Some modern variants available from pharmacies are made of flexible plastic and can be compressed to exert additional pressure. In recent years alternative strategies have been developed, including bulb syringes in which the flow is created by squeezing a bulb and more advanced ‘pulsatile devices’ which mechanically pump the saline.
The use of a neti pot requires mixing up a saline solution that will be poured through the nasal passages. A typical saline solution is a mixture of around 500 ml of water with 5 g of salt. Sodium bicarbonate is sometimes added. The neti pot used with a saline solution has been shown to be an effective treatment for hay fever, sinusitis, and other nasal conditions. The origins of nasal irrigation are understood to be in the ancient Hindu practice of Ayurveda whose roots are traced to the Vedas.
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February 12, 2011
Magnetic implants are an experimental process in which small magnets are placed under the skin, allowing objects to be magnetically attached to the body, and also enables the wearer to sense electromagnetic fields. They have been used for several years in dentistry and re-constructive surgery, but their use by the body modification community is recent. Having magnets implanted under the skin allows the wearer to attach magnetic items to the outside of the skin, and also enables the wearer to sense electromagnetic fields.
Samppa, a a body modification artist, implanted magnets in himself and close friends in the late 1990’s, but they weren’t very strong and were only capable of picking up small items. Jesse Jarrell and Steve Haworth developed small and powerful neodymium magnets encapsulated in silicone. The procedure is still experimental, and complications are common, including rupturing of the silicone shell.
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February 12, 2011
The Valsalva maneuver is performed by moderately forceful attempted exhalation against a closed airway, usually done by closing one’s mouth and pinching one’s nose shut. Variations of the maneuver can be used either in medical examination as a test of cardiac function and autonomic nervous control of the heart, or to ‘clear’ the ears and sinuses (that is, to equalize pressure between them) when ambient pressure changes, as in diving, hyperbaric oxygen therapy, or aviation.
The technique is named after Antonio Maria Valsalva, the 17th Century physician and anatomist from Bologna, whose principal scientific interest was the human ear. He described the Eustachian tube and the maneuver to test its patency (openness). He also described the use of this maneuver to expel pus from the middle ear. A modified version is done by expiring against a closed glottis. This will elicit the cardiovascular responses described below but will not force air into the Eustachian tubes.
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February 11, 2011
The vagus nerve [vey-guhs] is the tenth of twelve cranial nerves. Besides output to the various organs in the body, the vagus nerve conveys sensory information about the state of the body’s organs to the central nervous system. 80-90% of the nerve fibers in the vagus nerve are afferent (sensory) nerves communicating the state of the viscera to the brain. The medieval Latin word ‘vagus’ means literally ‘Wandering’ (the words vagrant, vagabond, and vague come from the same root). Sometimes the branches are spoken of in the plural and are thus called vagi.
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February 8, 2011
Oxytocin is a mammalian hormone that acts primarily in the brain. It is best known for roles in female reproduction. It is released in large amounts during labor, and after stimulation of the nipples, facilitating birth and breastfeeding. Recent studies have begun to investigate oxytocin’s role in various behaviors, including orgasm, social recognition, pair bonding, anxiety, and maternal behaviors. For this reason, it is sometimes referred to as the ‘love hormone.’
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February 8, 2011
The lunula [loo-nyuh-luh] (‘little moon’ in Latin) is the crescent-shaped whitish area of the bed of a fingernail or toenail. The lunula is the visible part of the nail matrix (i.e. the root of the nail). In humans, it appears by week 14 of gestation, and has a primary structural role in defining the free edge of the distal nail plate (the part of the nail that grows outward). The lunula is most noticeable on the thumb, however, not everyone’s lunula is visible. In some cases, the eponychium may partially or completely cover the lunula.
It is located at the end of the nail (that is closest to the skin of the finger), but it still lies under the nail. It is not actually white, but it only appears so, when it is seen through the nail. Outlining the nail matrix, the lunula is a very delicate part of the nail structure. If one damages the lunula, the nail will permanently be deformed. Even when the totality of the nail is removed, the lunula remains in place and is similar in appearance to another smaller fingernail embedded in the nail bed.
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