Infrared data from NASA’s Aqua satellite on Feb. 10 hinted that strong convection would likely make the low pressure area known as System 96S into the next tropical cyclone in the Indian Ocean. On Feb. 11, the same infrared data showed a well-developed, rounded area of thunderstorms and forecasters confirmed the low had become Tropical Storm 14S.
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This rather dramatic photograph of the sun was taken on Feb. 1 by the Japanese-led Hinode (pronounced hi-node-ay) solar mission currently orbiting the Earth. The 5-year old spacecraft can see the sun in extreme ultraviolet (EUV) and X-ray wavelengths, so it is especially adept at seeing multi-million degree solar plasma.
In this image, two large dark “coronal holes” can be seen.
The solar surface is twisted with magnetic field lines and within those magnetic loops (known, unsurprisingly, as “coronal loops”) solar plasma is trapped, accelerated, heated and pulled back to the solar surface — producing a phenomenon called “coronal rain.”
Read More at Source:http://news.discovery.com/space/theres-a-hole-in-the-sun.html
Biological weapons are toxic materials produced from pathogenic organisms (usually microbes) or artificially manufactured toxic substances that are used to intentionally interfere with the biological processes of a host. These substances work to kill or incapacitate the host. Biological weapons may be used to target living organisms such as humans, animals or vegetation. They may also be used to contaminate nonliving substances such as air, water and soil.
There are a variety of microorganisms that can be used as biological weapons. Agents are commonly chosen because they are highly toxic, easily obtainable and inexpensive to produce, easily transferable from person to person, can be dispersed in aerosol form, or have no known vaccine. Below is a list of a few potential biological organisms that may be used as biological weapons.
Early History
While most people today think of biological weapons as a relatively modern advancement, it is important to recognize that their existence predates recorded human history. Ancient civilizations had a working knowledge of plant and animal toxins, as well as of devastating diseases such as plague and smallpox. While these people had yet to discover the origins of such diseases, they were aware of how diseases could spread from one person or animal to another.
At one time or another, humans have turned to just about every viable option on the planet for new means of destroying one another. We’ve leveled forests, plundered the elements and diverted religion, philosophy, science and art to fuel humanity’s desire for bloodshed. Along the way, we’ve even weaponized some of nature’s most formidable viral, bacterial and fungal foes.
A very early example of biological warfare happened during the 12-15th century B.C.E. The Hittites, whose empire included what is now modern day Turkey, were known to have driven diseased animals and people into enemy territories. This was a likely common method of warfare around the world. One of the early and better-known uses of biological weapons was theMongol siege of Caffa, the port city now known as modern day Feodosija, Ukraine. The Tartar Mongols in 1343 B.C.E., the port city of Caffa was held under siege for years, until the Mongol army was devastated by a plague (Yersinia pestis) outbreak and catapulted their infected dead over the city walls. The disposal of these dead bodies in Caffa likely infected many of the city’s inhabitants, including fleas and rats that further spread infection upon the population. The following is an account of the siege from a survivor.
What seemed like mountains of dead were thrown into the city, and the Christians could not hide or flee or escape from them, although they dumped as many of the bodies as they could in the sea. And soon the rotting corpses tainted the air and poisoned the water supply, and the stench was so overwhelming that hardly one in several thousand was in a position to flee the remains of the Tartar army.”
Toxins
Toxins differ from other biological weapons agents in that they are the non-living products of living organisms without the ability to reproduce or replicate and have no incubation period before their symptoms start (which can be days to months for some diseases). The use of plant and animal toxins on arrows and darts was one of the earliest biological weapons. This is evident in the etymology of the word ‘toxin,’ which derives from ancient Greek root ‘tóxo-,’ meaning bow. Toxins were also used in a variety of other methods in warfare. Both the ancient Mayans and Romans were known to have used bee hives and hornet nests against their opponents, deploying the live insects to deliver the toxins. Similarly, in 184 B.C.E., the Carthaginian general Hannibal ordered his navy to catapult clay pots filled with venomous snakes onto enemy ships, helping him win the battle. Toxins were also used to poison enemy food and water supplies. For example, Hannibal and Julius Caesar likely used mandrake root to poison their enemies’ wine, and in 590 B.C.E., the ruler of Athens had the toxic roots of the beautiful hellebore plant dumped in the water supply of the city Kirrha, allowing him to take it without opposition.
The use of biological weapons is far from modern. However, while modern advancements of science and biotechnology have brought many societal benefits, the dual use nature of some research has allowed the creation and modification of biological warfare agents and delivery methods.
Links and Sources:
http://www.fas.org/blog/bio/2010/08/biosecurity-mini-history-early-use-of-bioweapons/
A widespread drought in the Amazon rain forest last year was worse than the “once-in-a-century” dry spell in 2005 and may have a bigger impact on global warming than the United States does in a year, according to British and Brazilian scientists .
More frequent severe droughts like those in 2005 and 2010 risk turning the world’s largest rain forest from a sponge that absorbs carbon emissions into a source of the gases, accelerating global warming, the report found.
Trees and other vegetation in the world’s forests soak up heat-trapping carbon dioxide as they grow, helping cool the planet, but release it when they die and rot.
The study, published in the journal Science, found that last year’s drought caused rainfall shortages over a 1.16 million square-mile (3 million square km) expanse of the forest, compared with 734,000 square miles (1.9 million square km) in the 2005 drought.
GREATER WEATHER EXTREMES
The widespread drought last year dried up major rivers in the Amazon and isolated thousands of people who depend on boat transportation, shocking climate scientists who had billed the 2005 drought as a once-in-a-century event.
Under the more extreme scenarios, large parts of the forest could turn into a savannah-like ecosystem by the middle of the century with much lower levels of animal and plant biodiversity. Although human-caused deforestation in Brazil has fallen sharply in recent years, scientists say the forest is still vulnerable.
“You could quite rapidly move to a much drier Amazon with less forest there,” Lewis told Reuters.
The research was a collaboration among scientists at the University of Leeds and the University of Sheffield in Britain and Brazil’s Amazon Environmental Research Institute.
Source:http://uk.reuters.com/article/2011/02/03/us-brazil-amazon-idUKTRE7127DN20110203
Image Link:http://www.lamolina.net/image/amazon-forest_resize.jpg
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