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Old 07-06-2009
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Default Ciudatenii ale naturii

Pana in acest secol s'au gasit explicatii pt multe necunoscute ale naturii si ale corpului uman. Daca in Antichitate se credea ca fulgerul este trimis de un Zeus infuriat, astazi stim sa explicam ce se intampla de fapt. M'am gandit sa deschid un thread dedicat special necunoscutelor din domeniul stiintei fara strivi, totusi, corola de minuni a lumii.

Primul subiect: combustia spontana

Most everyone these days has heard of the term Spontaneous Human Combustion, otherwise known as SHC; the spontaneous ignition of human flesh and subsequent burning of the body, usually until death and often until there are no remains to collect and analyse. Quite gruesome deaths if you ask me, though there have been cases of reported SHC wherein the victim did not die.
In the last 300 years there have been somewhere in the neighbourhood of 200 cases of SHC worldwide, though that number will vary depending on your source. Of those 200-some reports of persons bursting into flame like roman candles, only the most recent claims have stood to closer scrutiny, and some scientists think they have the phenomena explained.

Before we get into the science of SHC, let’s review the common characteristics of Human Combustion:

1) As the name suggests, there is to be a certain spontaneity to the event; a sudden ignition similar to a small explosion of flame. Surviving victims have reported feeling no heat or discomfort prior to realising that they were ablaze, though many, if not most victims of SHC were either alone or sleeping at the time of ignition, or both.

2) Analysis of the remains and scenes of known cases of SHC often reveal extreme heat, sometimes in excess of 1000◦, yet the surrounding environment is found characteristically unharmed. Even nearby draperies and furniture remains largely unaffected by the heat and flame, and in many cases, the very bed or chair in which the victim was seated survives the event with little damage.

3) No external source of ignition and no accelerant are found near or associated to the body. This point can be, and usually is argued, as many of the cases revealed both recent prior consumption of alcohol and cigarettes, and many researchers point to those elements as potential causes of non-SHC fire being to blame. Though this argument fails to acknowledge the second criteria in evaluating an SHC event (See above).

4) For unknown reasons, a majority of cases, in which the victim dies as a result of SHC, a single limb or extremity is left behind. The limb is normally severed by the heat/fire and, like the surrounding environment, remains largely unaffected by the fire (aside from the fact that the rest of the body was consumed).

In recent years there have been numerous explanations and theories presented for SHC, most of which have failed to impress fire officials, scientists and sceptics alike. Some of these hypotheses include: pyrokinesis, deliberate suicide by arson, accidental ignition by cigarette, low voltage electrocution, freak lightning strikes, demon attacks and even the Smite of God.
On the trail of these less conventional and sometimes completely ridiculous theories, Dr, John De Haan conducted an experiment for the cameras of BBC 1’s, QED program, in an effort to reveal the truth behind SHC. What followed is now commonly known as the Wick Effect.

http://www.paranormalpeopleonline.co...an-combustion/

O explicatie oferita de BBC: http://www.paranormalpeopleonline.co...an-combustion/


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Old 07-06-2009
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Meduzele ascund un adevar tulburator

Ignorate de stiinta timp de zeci de ani, enigmaticele celenterate au inceput sa le ridice tot mai multe intrebari cercetatorilor, care studiindu-le au constatat serioase lacune in informatiile lor referitoare la originile diversitatii vietii.
Fascinantele creaturi marine le-au amintit oamenilor de stiinta ca aproape tot ceea ce cred ca stiu despre evolutie poate fi rasturnat intr-un moment. Desi potrivit morfologiei lor, meduzele sunt in aparenta animale simple, fara axa bilaterala fata - spate, cele mai recente studii sugereaza o complexitate nebanuita pana acum a acestor organisme.
Ele poseda genele responsabile de trasatura bilaterala, doar ca nu le utilizeaza. Sau le folosesc, dar pentru a le specializa creierele intr-o maniera foarte subtila.


Acest lucru i-a condus pe oamenii de stiinta la ideea ca familia celenteratelor este de fapt descendenta din organisme mai complexe, bilaterale, adoptandu-si ulterior, pe cale evolutiva, forma mai simpla.
Asadar, in timp ce stramosul comun al celenteratelor a stabilit trecerea de la buretii de mare la organismele bilaterale, ele au continuat sa evolueze intr-o directie proprie pana au devenit meduzele pe care le stim astazi.
Pentru noi oamenii, cea mai nelinistitoare parte este aceea ca genele in discutie sunt identice cu cele prezente la toate vertebratele.
Deci cateva din trasaturile atribuite in general corpului vertebrat ar putea fi in realitate mult mai vechi decat se credea. Iar tulburatorul adevar este acela ca prin simpla lor existenta meduzele contrazic ideile deja stabilite vis-à-vis de evolutie si ne arata ca mai avem multe lucruri de invatat pana sa accedem la adevarul stiintific.


http://www.descopera.ro/dnews/457062...var-tulburator
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Last edited by RocketQu33n; 07-06-2009 at 09:37 AM..
  #3  
Old 11-05-2009
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O pânză de păianjen, veche de 140 de milioane de ani, a fost descoperită conservată în chihlimbar, în Sussex, Anglia.



Numeroase indicii duc la concluzia că pânza a fost ţesută de o specie de păianjen care este înrudită cu paianjenul orb, un păianjen de grădină, întâlnit şi în zilele noastre, potrivit livescience.com.
După modul în care este ţesută pânza, cercetătorii pot chiar oferi indicii cu privire la dieta păianjenilor. Insecte precum muşte sau strămoşi ai albinelor făceau parte din delicatesele de zi cu zi ale arahnidelor.
"Această pânză de păianjen este unică, având picături lipicioase pe întreaga suprafaţă, menite să ademenească prada", a declarat Martin Brasier, cercetător la Universitatea Oxford.
Cea mai veche pânză de păianjen cunoscută până acum a fost descoperită în 2006 şi era veche de peste 136 milioane de ani.












http://www.realitatea.net/a-fost-des...to_653707.html
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Are Bioluminescent Bacteria Behind Milky Seas Legend?

July 1, 2006 — For centuries, sailors in the Indian Ocean have told stories of seas glowing with a dim, white light at night. Satellite images have now confirmed the appearance of what seem to be bioluminescent bacteria, right where a ship's crew reported seeing the "milky seas" 11 years ago. Scientists say this rare phenomenon could be a way for the bacteria to attract the attention of fish so they can enter their guts and live there.

WHAT IS BIOLUMINESCENCE: Bioluminescence is the ability of a living organism to emit light. In bioluminescence a chemical reaction triggers an electron to jump to a higher level. Then the electron loses energy and falls back to a lower level, emitting the excess energy in the form of a particle of light. No energy is lost as heat, as in other means of light production, so bioluminescence is often called "cold light." The most common color of bioluminescent light produced by marine organisms is blue, which is also the color that penetrates farthest through water. In "milky seas," this light appears white because the rods in the human eye (used for night vision) don't discriminate color.
GLOWING BACTERIA: Dinoflagellates are organisms that cause red tides, flashing waves and the sparkling waves behind boats as they churn through the water, but these organisms must be physically stimulated to produce those brief bright flashes. In contrast, vibrio harveyi will glow with a continuous light on their own, under the right conditions. Those conditions include very high concentrations of the bacterial in order to accumulate enough of the trace chemical that induces this light production. A conservative estimate calls for 40 billion trillion bacteria packed into a space the size of Hawaii. This is equivalent to the number of grains of sand it would take to cover the entire earth with a layer 10 centimeters thick.




Mai multe informatii la: http://www.sciencedaily.com/videos/2...f_the_seas.htm


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Bacteria as art: http://www.sciencedaily.com/videos/2...ria_as_art.htm
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