Source:http://media.radiosai.org/

Source: http://earthsky.org/

Pl click the link below to see the beauty of Full Moon…

See it! Photos of last night’s full moon

Natarajan

Source: http://www.amusingplanet.com

Pl click the link below and read an interesting story as publishes in Amusing Planet site .

Natarajan

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The Mystery of The Longyou Caves

Source: http://earthsky.org

The Humongous Fungus

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Natarajan

Source: http://earthsky.org

Red rainbow at sunset, over Estonia

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Natarajan

Source:http://earthsky.org

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Natarajan

Americas? Moon fullest for you July 8

Trees need water throughout their bodies, from the depths of the roots to the tips of their leaves, sometimes tens of meters above the ground. So how do they manage to get the water up there?

To begin with, in the general case tree roots usually have higher concentrations of minerals than the soil that surrounds them. This causes root pressure, a phenomenon whereby the roots draw water in from the adjacent ground via osmosis.  (In contrast, minerals are drawn in to the area of higher mineral concentration in the roots via a different, active transport mechanism in which carrier cells in the root hairs pick up the minerals and transport them into the roots.)

For the uninitiated, osmosis is the movement of a solvent (such as water) across semi-permeable membranes (like root hairs), from areas of lower solute concentration to areas of higher solute concentration. (This osmotic pressure is also why salt can be used to preserve meat.) This would normally eventually equalize the solute concentration on both sides of the membrane, excepting the fact that the root hairs also have the aforementioned active transport method of keeping the mineral concentration inside greater than out and the fact that on the other end of things the water is being relatively rapidly evaporated off.

As water is pulled in, the new water creates pressure on that previously drawn, which causes it to move higher up the fluid column contained in the xylem, a transport tissue that runs the length of the trunk and up through the branches and the leaves.

Beyond osmotic pressure, once the stomata open, the leaves are also exerting pressure- albeit a negative one- when they transpire (when water evaporates from the leaves’ surfaces). As the water evaporates, the pressure within the leaves lowers, which creates a draw within the xylem, pulling water up toward the leaves.

While you might think this negative pressure would be minimal at best, it can actually reach pretty astounding levels at times, even upwards of -20 atmospheres, though it should be noted this varies greatly even within a specific tree, based on things like humidity levels, temperature, wind, soil moisture level, etc.

It should also be noted that there is a level of liquid adhesion to the walls of the xylem conduits helping to keep the fluid from flowing back down even as negative pressure decreases (such as when the stomata close) and gravity starts to take over.

Speaking of the xylem, trees that grow rather quickly typically have adapted wider xylem vessels, which increases the efficiency of moving water up through the tree; offering plenty of water and minerals throughout the plant to help facilitate its rapid growth.

However, wider vessels have a downside- the wider the xylem vessels, the greater the chance the tree will develop embolisms (air pockets), sometimes as a result of things like a dry spell that results in insufficient soil moisture causing some of the gases to boil off in the xylem as the negative pressure becomes too extreme.

As a pocket of air within a xylem vessel will stop the water flow (and sometimes spread rapidly throughout the xylem making the problem much worse), once enough bubbles are formed, the tree can no longer transport sufficient water throughout its body and it dies. (These types of air pockets are also why you should always put freshly cut flowers into water as quickly as possible in order to stop air from being drawn up, which in turn will stop the flower from later being able to suck up water; thus, the shelf life of your flowers in a vase diminishes significantly.)

On the other hand, trees that have a relatively slow growth rate often have narrower xylem vessels (which results in slower transport of water and nutrients); being smaller in diameter, the vessels of these old, sometimes eventually super tall trees are much less likely to develop such embolisms, potentially helping them live significantly longer than many of their brethren with wider xylem vessels.

Source….www.today i found out .com

Natarajan

Source:http://media.radiosai.org/

The only wealth that you can carry with yourself after death is love for God. So strive to earn that wealth during your living moments earnestly. You can easily accomplish it with pure loving devotion. To earn it, you must dedicate your time, body and actions to serve the Lord. This was what Arjuna understood after listening to the Gita from Lord Krishna. Arjuna, who was an exceptionally intelligent person, after all his arguments with Krishna, finally came to this conclusion and submitted, “Karishye vachanam tava (I shall carry out whatever You say)”. People should depend not on their physical or intellectual strength, but on the power of God. Only the one who relies solely on the power of God can experience true peace and bliss. Such a person need not mind the criticisms of others. They can defy the opinions of a multitude of persons and stand up for what they hold to be true. Unmindful of praise or censure, you have to cultivate firm faith in God.

Natarajan

Source:http://media.radiosai.org/

Natarajan

Source:http://www.amusingplanet.com

Pl .click the link below and read  the story

Natarajan

Paracas Candelabra of Peru