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." Classic old Bisbee (Czar shaft) 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.
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. If these paralogous gene pairs can be identified by sequence similarity, then the original gene should be present in all organisms whereas the new version will be present only in the more recently derived organisms. The root for the tree in the diagram above was determined by using paralogous genes for translation elongation factors involved in synthesis of protein chains on the ribosomes. Domains and Kingdoms The proposed universal phylogenetic tree recognises three Domains of organisms (Bacteria, Archaea and Eucarya) above the traditional level of Kingdoms. The archaea
Trailspace.com: The Backcountry Gear Guide 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. Limiting Magnitude=4. Limiting Magnitude=6. Limiting Magnitude=7. 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.
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). 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. Airspeeds were found to be mostly in the 10-to-40-mph range. Copyright ® 1988 by Paul R.
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. 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.
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 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. The "Big One" for 2011 would be the entire 212 mile John Muir Trail. It turns out getting a backcountry permit in Yosemite National Park and surround areas is much like winning the California Lottery. We felt lucky when we managed to get a thru-hike permit starting at Tuolumne Meadows, which is at mile 24 of the JMT, so we would be skipping the Yosemite Valley portion. 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.
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. Benefits enjoyed by hikers who have lightened up include: 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! What about safety? I rank possible backcountry injury/illness into three categories: REMEMBER! What about comfort?