The Hellenic Navy (HN) (Greek: Πολεμικό Ναυτικό, Polemikó Naftikó, abbreviated ΠΝ) is the naval force of Greece, part of the Greek Armed Forces. The modern Greek navy has its roots in the naval forces of various Aegean Islands, which fought in the Greek War of Independence. During the periods of monarchy (1833–1924 and 1936–1973) it was known as the Royal Navy (Βασιλικόν Ναυτικόν, Vasilikón Naftikón, abbreviated ΒΝ).The total displacement of all the navy's vessels is approximately 150,000 tons.The motto of the Hellenic Navy is "Μέγα το της Θαλάσσης Κράτος" from Thucydides' account of Pericles' oration on the eve of the Peloponnesian War. This has been roughly translated as "Great is the country that controls the sea". The Hellenic Navy's emblem consists of an anchor in front of a crossed Christian cross and trident, with the cross symbolizing Greek Orthodoxy, and the trident symbolizing Poseidon, the god of the sea in Greek mythology. Pericles' words are written across the top of the emblem. "The navy, as it represents a necessary weapon for Greece, should only be created for war and aim to victory."...............The Hellenic Merchant Marine refers to the Merchant Marine of Greece, engaged in commerce and transportation of goods and services universally. It consists of the merchant vessels owned by Greek civilians, flying either the Greek flag or a flag of convenience. Greece is a maritime nation by tradition, as shipping is arguably the oldest form of occupation of the Greeks and a key element of Greek economic activity since the ancient times. Nowadays, Greece has the largest merchant fleet in the world, which is the second largest contributor to the national economy after tourism and forms the backbone of world shipping. The Greek fleet flies a variety of flags, however some Greek shipowners gradually return to Greece following the changes to the legislative framework governing their operations and the improvement of infrastructure.

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This is a bilingual blog in English and / or Greek and you can translate any post to any language by pressing on the appropriate flag....Note that there is provided below a scrolling text with the 30 recent posts...Αυτό είναι ένα δίγλωσσο blog στα Αγγλικά η/και στα Ελληνικά και μπορείτε να μεταφράσετε οποιοδήποτε ποστ σε οποιαδήποτε γλώσσα κάνοντας κλικ στη σχετική σημαία. Σημειωτέον ότι παρακάτω παρέχεται και ένα κινούμενο κείμενο με τα 30 πρόσφατα ποστς....This is a bilingual blog in English and / or Greek and you can translate any post to any language by pressing on the appropriate flag....Note that there is provided below a scrolling text with the 30 recent posts...Αυτό είναι ένα δίγλωσσο blog στα Αγγλικά η/και στα Ελληνικά και μπορείτε να μεταφράσετε οποιοδήποτε ποστ σε οποιαδήποτε γλώσσα κάνοντας κλικ στη σχετική σημαία. Σημειωτέον ότι παρακάτω παρέχεται και ένα κινούμενο κείμενο με τα 30 πρόσφατα ποστς.........

Sunday, March 11, 2012

"Clock genes" of cress plants...[ 2782 ],

Plants' natural circadian rhythm genes revealed

Cress plants in the Uni of Edinburgh lab (c) Halliday Lab, University of Edinburgh

Scientists examined the 12 "clock genes" of cress plants

BBC,.. 11 March 2012 Last updated at 03:17

A gene that triggers plants to become dormant at night and controls flowering has been discovered by scientists.

Computer models of cress plants genes showed how 12 genes work together to set plants' internal clocks, University of Edinburgh researchers said.

They found that a protein, known as TOC1, previously associated with helping plants to wake up, dampened down gene activity at night.

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Professor Andrew Millar said "it was a big change in thinking".

Plants, animals and even bacteria go through a daily 24-hour routine, known as a circadian rhythm, which allow them to make tiny adjustments as daylight changes, and adapt to changing seasons.

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Prof Millar said: "Just like humans you should think about plants having rhythms.

"Having a biological clock is particularly important for plants to prepare for daylight and at night-time [to] store energy for growth.

"We now understand how the dozen or so genes work and are typical to particular times of the day," he said.

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The Edinburgh-led study was published in Molecular Systems Biology.

Prof Millar said the results would help further research into the flowering of other plants - particularly crops such as wheat, barley and rice.

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Rice plant

"It's useful as it's important in terms of biology and flowering.

"We now understand how it all fits together and how the same genes control rhythms in all plants as far back as single-celled algae," he said.

Another study run independently in Barcelona has also made similar findings to the Edinburgh research.

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Professor Paloma Mas, of the Centre for Research in Agricultural Genomics in Spain, said: "We can now extend the knowledge we have gained of cyclic processes to the major crops and other plants of agronomic interest."

Prof Millar said the new data would help scientists discover more about other plant genes.

"We now know about 12 genes - but we would still like to know about the ones that control photosynthesis, nitrogen use, and petal opening and fragrance."

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