Tuesday, July 21, 2009

وشك منور زي البدر حقيقة علمية

كاميرات تلتقط صورا لخلايا تشع في الظلام

قالت صحيفة "الغارديان" البريطانية إن كاميرات فائقة الحساسية، تمكنت مؤخرا من التقاط صور لاشعاعات تصدر بكميات ضئيلة جدا من خلايا الجسم، لا يمكن ملاحظتها بالعين المجردة.
وأفادت الصحيفة بأن علماء يابانيين تمكنوا من التقاط صور "متلألئة" لأجساد البشر. وعلي الرغم من معرفة العلماء أن أجسام الكائنات الحية تنتج كميات ضئيلة من الضوء، كنتيجة للتفاعلات الكيميائية بين الخلايا، فإن هذه هي المرة الأولي التي تلتقط فيها صور لهذه الحالة علي كاميرات.
ونقلت الصحيفة وصف الباحثين لكيفية تصوير أجسام المتطوعين باستخدام الكاميرات فائقة الحساسية علي مدار عدة أيام، حيث أظهرت نتائجهم أن كمية الضوء المنبعثة تصل إلي أقصاها في آخر النهار وأدناها في آخر الليل، وأن أكثر المناطق إضاءة في جسم الإنسان هي منطقة الوجنات ومقدمة الرأس والرقبة

Humans glow in the dark
Ultra-sensitive cameras reveal that our bodies emit tiny amounts of light that are too weak for the human eye to detect

Amazing pictures of "glittering" human bodies have been released by Japanese scientists who have captured the first ever images of human "bioluminescence".

Although it has been known for many years that all living creatures produce a small amount of light as a result of chemical reactions within their cells, this is the first time light produced by humans has been captured on camera.

Writing in the online journal PLoS ONE, the researchers describe how they imaged volunteers' upper bodies using ultra-sensitive cameras over a period of several days. Their results show that the amount of light emitted follows a 24-hour cycle, at its highest in late afternoon and lowest late at night, and that the brightest light is emitted from the cheeks, forehead and neck.

Strangely, the areas that produced the brightest light did not correspond with the brightest areas on thermal images of the volunteers' bodies.

The light is a thousand times weaker than the human eye can perceive. At such a low level, it is unlikely to serve any evolutionary purpose in humans – though when emitted more strongly by animals such as fireflies, glow-worms and deep-sea fish, it can be used to attract mates and for illumination.

Bioluminescence is a side-effect of metabolic reactions within all creatures, the result of highly reactive free radicals produced through cell respiration interacting with free-floating lipids and proteins. The "excited" molecules that result can react with chemicals called fluorophores to emit photons.

Human bioluminescence has been suspected for years, but until now the cameras required to detect such dim light sources took over an hour to capture a single image and so were unable to measure the constantly fluctuating light from living creatures.

While the practical applications of the discovery are hard to imagine, one can't help wondering what further surprises the human body has in store for us

Cameras capture images of cells radiate in the dark

The newspaper "The Guardian" that the British super-sensitive cameras, has recently been able to take pictures of radiation make very small quantities of cells of the body, can not observe the naked eye.
The paper reported that Japanese scientists were able to take pictures of "glittering" of the bodies of humans. In spite of the scientists know that the objects of organisms produce small quantities of light, as a result of the chemical interactions between the cells, this is the first time by taking pictures of this situation on the cameras.
The newspaper quoted the researchers described how the use of imaging objects volunteers cameras high sensitivity over several days, where their findings showed that the amount of light emitted up to a maximum at the end of the day and lowest at the end of the night, lighting, and more areas in the human body is the Aluzhnat Introduction to the head and neck.

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