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Micrographia: A Light Microscopy Resource: Home Page and Site Directory. Explore Nature& Air Resources Division-Natural Lightscapes The darker the sky, the more stars can be seen. The following simulated images depict how the constellation Orion appears under various sky conditions. Images are courtesy of GLOBE at Night. How good is your sky at home? Limiting Magnitude=2. This is typical of an urban sky. Limiting Magnitude=4. Limiting Magnitude=6. Limiting Magnitude=7. The Backcountry Gear Guide Molecular Expressions Microscopy Primer: Interactive Java Tutorials - Virtual Microscopy: Magnification Interactive Java Tutorials Magnification Module This interactive Java tutorial explores the effect of increasing magnification (equivalent to changing microscope objectives) on the ability to resolve features in a sample. To operate the tutorial, first use the pull-down menu to select a sample for viewing. Important Note: Once all 6 magnifications have been downloaded locally to your computer, selecting between them will become much quicker because they already exist in your browser's cache. Click Here if you need help with operation of the virtual microscope. Contributing Authors Mortimer Abramowitz - Olympus America, Inc., Two Corporate Center Drive., Melville, New York, 11747. Matthew J. Questions or comments? This website is maintained by ourGraphics & Web Programming Team in collaboration with Optical Microscopy at theNational High Magnetic Field Laboratory.

Profiles of microorganisms: the microbial world We should note a technical point about this tree: the comparison of ribosomal RNA gene sequences can show the possible relatedness of organisms, but other information is needed to provide the root of a tree. One of the principal modes of evolution is thought to involve gene duplication followed by divergence. The original gene retains its vital function, while the copy can change and ultimately can encode a new function. Domains and Kingdoms The proposed universal phylogenetic tree recognises three Domains of organisms (Bacteria, Archaea and Eucarya) above the traditional level of Kingdoms. For further details and discussion, see: DM Williams & TM Embley (1996). University of California Museum of Paleontology (not on this server) What should we now recognise as Kingdoms? Origin and evolution of eukaryotes Eukaryotes must have arisen from prokaryotic ancestors. Thus, it is believed that these organelles of eukaryotes represent bacteria that once lived inside the cells of other bacteria.

Extreme Environments - StumbleUpon People Get Thirsty in Winter, Too by Karen Berger from GORP In cold weather camping, one of the best things you can do to stay healthy is develop a drinking habit. I'm talking water, not wine. Adequate hydration is key to avoiding hypothermia and altitude sickness. But what if you're camped in a vast expanse of snow where everything is frozen? In freezing cold weather, look for flowing water.

What causes the smell after rain?" Most people notice a distinctive smell in the air after it rains. It's frequently linked with spring, as the smell of fresh cut grass is associated with summer. You'll find it in a lot of poetry and also on many inspirational lists of things to be happy about. But what causes it? As it turns out, the smells people associate with rainstorms can be caused by a number of things. Another sort of smell is caused by the acidity of rain. Another after-the-rain smell comes from volatile oils that plants and trees release. These are a few common rain smells, but there are also all sorts of other scents after it rains. BioLite User:Tillman/Favorite minerals From Wikipedia, the free encyclopedia Favorite mineral photos Goethite after pyrite, Utah Blue fluorite, China Copper "sword", Kazakhstan Mockingbird Mine, California Johachidolite, a calcium aluminum borate, from Burma. Per Rob Lavinsky, "this specimen is an incredible rarity." Chrysocolla and tyrolite, Santa Rosa-Huantajaya District, Chile Pyrite, Leonard Mine, Butte Copper, Ray Mine, AZ Spinel-twinned gold on "wire", Eagle's Nest Mine, CA Old Ibex mine, Leadville. 19th century specimen! Classic old Bisbee (Czar shaft)

How Fast and High Do Birds Fly? How Fast and High Do Birds Fly? Generally birds follow the facetious advice often given to pilots -- "fly low and slow." Most cruise speeds are in the 20-to-30-mph range, with an eider duck having the fastest accurately clocked air speed of about 47 mph. During a chase, however, speeds increase; ducks, for example, can fly 60 mph or even faster, and it has been reported that a Peregrine Falcon can stoop at speeds of 200 mph (100 mph may be nearer the norm). Interestingly, there is little relationship between the size of a bird and how fast it flies. There is, of course, a considerable difference between the speed at which a bird can fly and the speed at which it normally does fly. In order to determine what birds normally do, Gary Schnell and Jenna Hellack of the University of Oklahoma used Doppler radar, a device similar to that used by police to catch speeders, to measure the ground speeds of a dozen species of seabirds (gulls, terns, and a skimmer) near their colony.

Baltimore Oriole (east) & Celebrate Urban Birds - StumbleUpon Habitat On their breeding grounds in eastern and east-central North America, you’ll most often find Baltimore Orioles high in leafy deciduous trees, but not in deep forests; they prefer open woodland, forest edge, river banks, and small groves of trees. They also forage for insects and fruits in brush and shrubbery. Baltimore Orioles have adapted well to human settlement and often feed and nest in parks, orchards, and backyards. On their winter range in Central America, Baltimore Orioles occupy open woodlands, gardens, and shade-grown coffee and cacao plantations. Food Baltimore Orioles eat insects, fruit, and nectar. Behavior Baltimore Orioles are agile feeders that comb the high branches of trees in search of insects, flowers and fruit. Nesting Baltimore Orioles build remarkable, sock-like hanging nests, woven together from slender fibers.

Mountain UltraLight: John Muir Trail (Trip Report) This hike has been a work in progress for the past year. In 2010 we did a 112 mile hike in California on the PCT section-A in the spring, then another beautiful 55 miles in Oregon from MT. Hood to Cascade Locks in late summer. It turns out getting a backcountry permit in Yosemite National Park and surround areas is much like winning the California Lottery. The initial plan was for 6 of us to do the entire thru hike, and another 2 to join us on the first 36 miles until we got to Mammoth Lakes. Day one was planned to be a very easy one starting around noon with just 10 total miles and very little elevation gain. After a short steep climb up to Lyell Forks, we enjoyed a pristine campsite next to a roaring stream, but the mosquitos had us in bed early. Day two - We got on the trail around 8:00am, then headed to our first big climb up Donahue Pass. Merino Wool socks kept our wet feet warm along the flooded, steep trail. It was a bit slippery on the way down as JP demonstrates. Pack Envy!

I need more convincing… « GossamerGear Okay, you’re intrigued with the possibility of heading out backpacking with a lot less weight on your back. But you can’t help it, maybe it’s just the way you’re wired, but you’ve got questions that you need answered before you’re ready to start the journey. I need to hear the benefits of going lighter. Not everyone will experience all the benefits of a lighter backpack, but then not everyone is looking for all the benefits of going lighter. Easier on the body Even if you do manage to find the perfect backpack, with awesome padding, with a perfectly adjustable harness, compression straps, load lifters, canted waist belt, amazing frame, so that your shoulders aren’t sore, you’re STILL putting that load onto your poor knees and feet! Hey, I already own a bunch of [heavy] gear! Good news! Leaving stuff at home As you analyze your gear list with weights, and think about what you actually use on trips, you’ll figure out things to leave at home. What about safety? REMEMBER! What about comfort?