Archive for julho 15th, 2015

Luz e Origem da Vida: Mais Importante Informaçoes

quarta-feira, julho 15th, 2015

Informaçoes obtidas num post do CeV Forum:

http://www.evcforum.net/dm.php?control=msg&t=5978

EvC Forum  Science Forums  Education and Creation/Evolution  Miller and Urey Experiment: What has changed?

Message 12 of 85 (674198)
09-27-2012 2:21 AM

There has to be energy to form these amino acids. Hence the lightning. No new data has been released because no new successful experiment has been conducted. (It’s not the fault of the scientists, they tried hard)

Here’s what I don’t like about the Miller-Urey experiment. It does not use the whole spectra of the UV range. It uses a specific wavelength to produce the amino acids and left out all the rest. (Which would have been harmful to the amino acids. Part of the reason why UV light is used to kill bacteria in hospitals.).

It also had traps to remove the product before it is destroyed by radiation. Not something found in the natural world. (The ocean would not have protected the amino acids in a natural enviroment. UV light can penetrate several meters)

Also, presumed conditions of primordial earth would have driven the amino acids toward lonely isolation. Hence any formation of proteins would have been subverted. There is also a strong tendency for peptide bonds to break down in water.

In addition to this, there is something known as the “chirality problem”. With rare exceptions, all bio-molecules of amino acids are left-handed, and those of sugars are right-handed.

Racemates are mixtures artificially created that have a 50:50 ratio of right and left-handed.

Edited by Adminnemooseus, 27-Sep-2012 2:56 AM: Blank lines

xxxx

Pesquisa:

Sunlight

Wikipedia – Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is filtered through Earth’s atmosphere, and is obvious as daylight when the Sun is above the horizon. When the direct solar radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light andradiant heat. When it is blocked by the clouds or reflects off other objects, it is experienced as diffused light. The World Meteorological Organization uses the term “sunshine duration” to mean the cumulative time during which an area receives direct irradiance from the Sun of at least 120 watts per square meter.

The ultraviolet radiation in sunlight has both positive and negative health effects, as it is both a principal source of vitamin D3 and a mutagen.

Continuar a ler….

Material extraido de:

http://www.physicalgeography.net/fundamentals/7f.html

http://www.physicalgeography.net/fundamentals/images/cascade.GIF

Figure 7f-1: The process of atmospheric scattering (espalhamento) causes rays of sunlight to be redirected to a new direction after hitting a particle in the atmosphere. In this illustration, we see how three particles send light rays off into three different directions. Scattering does not change the striking light ray’s wavelength or intensity. (http://www.physicalgeography.net/fundamentals/images/scattering.jpg

Importante para ver como fotons entram nas particulas dos atomos terrestres e passam a atuar aplicando seu poder de radiaçao desde a particula.

Figure 7f-2: Atmospheric absorption. In this process, sunlight is absorbed by an atmospheric particle, transferred into heat energy, and then converted into longwave radiation emissions that come from the particle – http://www.physicalgeography.net/fundamentals/images/absorption.jpg