Posts by Samuel


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1) Message boards : SETI@home Science : Let's see some results! (Message 1494532)
Posted 23 days ago by Profile Samuel
I don't think that single biomarkers can be signs of life. The important thing is the chemical equilibrium of the whole atmosphere. If it's far away from equilibrium and you can't explain why it is so, then probably it's produced by life.


maybe you are interrested in a quote i found in a book:

The idea is that gas byproducts from metabolic redox reactions can accumulate in the atmosphere and would be recognized as biosignauters because abiotic processes are unlikly to create a redox disequilibrium. indeed earth's atmosphere has oxygen (a highly oxidized species) and methane (a highly reduced spcies) several orders of magnitude out of the thermochmical redox equilibrium.

In practice it could be difficult to detect redox disequilibrium molecular featurs. The earth as an exoplanet, for example, has a relatively prominet oxygen absorption feature at 0,76um, whereas methane at presentday levels of 1,6 ppm has only extremly weak spectral features. During early earth CH4 may have been present at much higher levels (1000 ppm or even 1%), as possibly produced by widespread methanogen bacteria (Haqq-Misara et. al 2008). Such high CH4 concentrations would be easier to detect, but since the earth was not oxygenatd during erly times the O2-CH4 redox dissequilibrium would not be detectable concurrently (des marias et al. 2002)
2) Message boards : SETI@home Science : Kepler Telescope (Message 1480542)
Posted 53 days ago by Profile Samuel
+100


i am pretty sure if we would be at 2,000 light years from here and try to find an exoplanet here , we wouldnt find nor the earth, but also wouldnt find Jupiter nor Saturn.

Why i think that ?

cause the earth does a 365 days revolution. and Jupiter 12 years and Saturn 29 years.

you need to find a dim change of light from our Sun every 365days or 12years/ 29years

we need datas over a 100years period of all stars of our galaxy.
we would be already dead by then ^^

Your logic seems sound to me. +1
3) Message boards : SETI@home Science : New Science Channel programming most likely disappointing (Message 1479520)
Posted 55 days ago by Profile Samuel
i also think so. UFOs aren't a scientific topic. there are Maybe just some unknown meteorological phenomenons waiting to be discovered...
sadly this topic is beeing handled very unserious and childish.
4) Message boards : SETI@home Science : Are we intelligent enought to even acknowledge an ET call? (Message 1478248)
Posted 58 days ago by Profile Samuel
citation for this supposed biologist who claims all of that as well, especially the five fingers part


I can't give you now a excat citation, but Simon Conway Morris worte a book about convergent evolution. Life's Solution. Inevitable Humans in a Lonely Universe.

Run that by me again in English?


is my english so bad? :-D
5) Message boards : SETI@home Science : Are we intelligent enought to even acknowledge an ET call? (Message 1477912)
Posted 59 days ago by Profile Samuel
But if we trust some biologists, an intelligent extra-terrestrial species would be a bilaterally symmetrical organism, with a bipedal locomotion, 5 fingers, cephalization and using the same senses as we do…etc... In fact they would be very similar to homo sp. They justify this idea with the biological principle of convergent evolution. :-)
6) Message boards : SETI@home Science : Are we intelligent enought to even acknowledge an ET call? (Message 1477516)
Posted 60 days ago by Profile Samuel
Sure, mathematic seems to be universal, and so this aspect would be no problem for us. But what about the linguistic barriers between ET and humans? And maybe they use different ways of thinking... Imagine a eusocial species communicating via chemical compounds (like ants), such a species would be aware of the world they are living in in a way we can’t hardly imagine.
7) Message boards : SETI@home Science : Are we intelligent enought to even acknowledge an ET call? (Message 1476988)
Posted 61 days ago by Profile Samuel
An ET- society which is trying to communicate (radio signals) with other hypothetical civilisations reminds me of our own society.
In a very anthropocentric point of view they would be very similar to homo sapiens. Similar technology.. discovery spirit… And the transmitted signal would be easy to detect for us, but I think it would be maybe impossible for us to decode any information out of such signal.
8) Message boards : Politics : In HawaiianHustlin'Hussein's UNIVERSALIST Ideal WOrld, yOu Start WWIII wif a PhOne and a Pen. Oh, and wif a TeleprOmpteR. Start and LOse dat 'is'. PhoneAndPenPitifulPOtus. Name 'em and Blame 'em. (Message 1465363)
Posted 89 days ago by Profile Samuel
wtf?
9) Message boards : SETI@home Science : Origin of life? (Message 1385365)
Posted 292 days ago by Profile Samuel
The one and absolutely the only place life could come from is space.


I'm not a campaigner for the panspermia hypothesis. you can compare the early earh with a chemical laboratory. Everything life is made of you can find here.
Asteroids maybe brought some building blocks (and also nearly the whole H2O) for the first autoreplicating polymeric moleculs (maybe RNA, PNA (peptide nucleic acid), prebiotic proteins eg..). :-)
10) Message boards : SETI@home Science : Planet Hunters Report Record-Breaking Discovery (Message 1385353)
Posted 292 days ago by Profile Samuel
i agree that there are billions of earth- like planets in the universe.
But the philosophers' stone will be to find a planet whose physical parameters are nearly exactly the same as we know them form earth.
For example: mass, rotation-period, the solar spectrum and the age of the star where the planet is orbiting, a moon (big moon), a jupiter like planet in the outer solarsystem, percentage of heavy metals (heavier than He), climate of the planet, axis dispositon, plate tectonic, spiral galaxy, habitable zone of this galaxy.... and so on..
all this parameters reduce the our opportunities to find such an planet.
the next big question is: is life omnipresent?
11) Message boards : SETI@home Science : Biological SETI - We're looking the wrong way (Message 1357705)
Posted 364 days ago by Profile Samuel
What about mutation rates? They are pretty high in unused parts of den DNA. And so I think It would be nearly impossible do decode the orignale message
12) Message boards : SETI@home Science : So many planets and no way to get there. What a bummer! (Message 1333911)
Posted 438 days ago by Profile Samuel
It doesnt matter ,if you run marathon in space and reap little on bone loss.


squids would be nice astronauts.. :-)
13) Message boards : SETI@home Science : Fossils in a newly fallen meteorite? (Message 1329494)
Posted 450 days ago by Profile Samuel
the nanoparticles found in ALH are simply to small. length: 380nm
wide range about 20nm.(Scientific american) ( 20-100 nanometres in diameter, wiki)
the diameter of a ribosome is about 20-25nm. in an E.Coli you can find about 20 000 ribosomes.
the smallest living beeing (Mycoplasma) has a diamter about 200nm.
Staphylococcous aureus: 600nm....
the ALH84001 particles are to small to produce Proteins, no space for a metabolism etc.
The famous nanobacteria (for example Nanobacterium sanguineum)seems to be only anamorphic hydroxylapatite crystals (Ca2+ + PO42-) with proteins, lipids, DNA, RNA.. (sientific american)

you may like: http://journalofcosmology.com/Panspermia1.html
14) Message boards : SETI@home Science : Fossils in a newly fallen meteorite? (Message 1329402)
Posted 451 days ago by Profile Samuel
Remember ALH 84001... Nanobacteria from mars, a great failure

Today, rock 84001 speaks to us across all those billions of years and millions of miles. It speaks of the possibility of life.
Bill Clinton



15) Message boards : SETI@home Science : Fossils in a newly fallen meteorite? (Message 1328544)
Posted 453 days ago by Profile Samuel
Bilateral symmetry seems to be one of those features that occur again and again in very many, and very different forms of life.


Yes nearly every high developed has a bilateral Symmetry - the Bilateria.
I just wanted to say that there are two crown-groups of Diatomeens- the Order Centrales engl. Centric(radial) and the Order Pennales engl. Pennate (bilateral)(old system).

.... examined before we can say with certainty whether this is an Earthly organism, or one that merely has some points of resemblance to same.


this discovery need to be checked, true.
But you have to be very careful and critical about this topic.

It states that among competing hypotheses, the one that makes the fewest assumptions should be selected.
Occam's razor

16) Message boards : SETI@home Science : Fossils in a newly fallen meteorite? (Message 1328340)
Posted 453 days ago by Profile Samuel
yes convergent evolution is common in nature. Same solutions for the same problems.
but its nearly impossible that life on other planets "choose" the same way of evolution.
Diatomeen are well studied. their ecology etc and also their evolution, because they store silic acid (SiO2 · n H2O) in their cell wall. And so you can find them often well preserved.
I know not much about them but when you take a look a the picture you can specify the Order. I looks like O. Pennales because of their bilateral symmetry.
O. Pennales (Eunotiales, Diatomales, Achnanthes or Naviculales), its hard to specify exactly, because you only see one side of this organism.

Does anybody know better? some botany experts? :-)
17) Message boards : SETI@home Science : Fossils in a newly fallen meteorite? (Message 1328287)
Posted 454 days ago by Profile Samuel
These diatoms have definitely an terrestrial origin.

Diatoms appeared hundred billions of years after the "genesis".
The oxygenic photosynthesis they use have been invented by Cyanobacteria.
Diatomeen also have an secondary endosymbiosis (with am eucaryotic algae).
They also an N2-fixing endosymbiosis (with Cyanobacteria).

This is the result of a long long evolution on earth.

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I think panspermia is a nice idea. But i think that the originate of life happened on earth.
meteorites may be important for accumulation organic matter.
18) Message boards : SETI@home Science : Astropulse result (Message 1317030)
Posted 483 days ago by Profile Samuel
Hello, sorry i don't know where to post my question. and so i decided to make a new thread :-) Sorry about that.

What does that mean? ap_12no12aa_B4_P1_00052_20121218_25767.wu_0

RFI? or simply a compute error?


Found 30 single pulses and 30 repeating pulses, exiting.
percent blanked: 0.00

http://setiathome.berkeley.edu/result.php?resultid=2758438248

19) Message boards : SETI@home Science : HD 40307g (Message 1303509)
Posted 524 days ago by Profile Samuel
new discovery: HD 40307g

http://phl.upr.edu/press-releases/firstpotentialhabitableexoplanetinasix-planetstarsystem

http://phl.upr.edu/projects/habitable-exoplanets-catalog
20) Message boards : SETI@home Science : Search humanoids based on silicon. (Message 1303122)
Posted 525 days ago by Profile Samuel
a funny thing:

a silicon-based organismen maybe would exhale fire and SiO2 on a planet with O2 in the atmosphere.

They may produce Silane (SiH4)as end product of their metabolism.

SiH4 + 2O2 ---> SiO2 + 2H2O +ΔT

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Note.
a anaerobic metabolism wouldn't create enough energy for intellingent lifeforms.
So these fire-spitting aliens are just fiction.




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