Posts by Samuel

21) Message boards : SETI@home Science : Search humanoids based on silicon. (Message 1303122)
Posted 7 Nov 2012 by Profile Samuel
Post:
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

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


22) Message boards : News : New AstroPulse applications for GPUs. (Message 1300710)
Posted 31 Oct 2012 by Profile Samuel
Post:
Why i don't get any astropulse- tasks (ati_gpu)? since 2 months or so, my computer doesn't get any astropulse tasks..
Out of work?
23) Message boards : SETI@home Science : black holes - white holes - worm holes (Message 1262500)
Posted 20 Jul 2012 by Profile Samuel
Post:
that would make sense... but i never heard that white holes really exist. they would be very easy to detect- because they would emit matter.
and nobody had ever seen such a phenomen.
24) Message boards : SETI@home Science : Search humanoids based on silicon. (Message 1261743)
Posted 18 Jul 2012 by Profile Samuel
Post:
Hello Pop Horea-Vasile,


why carbon?
- we only know life-forms based on carbon
- carbon can create single-, double-,triple-bonds. (even with other carbon atoms)
- there can be hydrophilic and hydrophobic regions (- amphiphilic molecules- these molecules are very important for life in liquid solutin (h2o)- biomembrane- lipid-bilayer)
- alkanes, alkene, alkyne... long chains
- carbon compounds can create cycles, even heterocycles (with N eg.-> DNA, RNA, important for carrying the genetic information. maybe this information can be also saved on an aperiodic crystal..)
25) Message boards : SETI@home Science : The subject of UFOs (Message 1261736)
Posted 18 Jul 2012 by Profile Samuel
Post:
maybe my statement has nothing to do with the actuall discussion now in this thread...
in context to 'the subject of UFOs' i only can say that UFOs are mostly frauds, airplanes, strange meteorological phenomena, e.g. :-)
no visitors from outer space.... and no strange subjects like in "the X-files"
26) Message boards : SETI@home Science : Boinc run settings (Message 1185208)
Posted 14 Jan 2012 by Profile Samuel
Post:
i use all my cores 100%, even when i use the computer..
i think that isn't a problem because (on my computer) the seti- tasks run under a low priority. maybe you have to controll the cpu- core temperature.
sometimes when i run a programm wich uses more cpu- performance i set back to 70%- 50%.
27) Message boards : SETI@home Science : Large moons unnecessary for stable planet ecospheres? (Message 1175828)
Posted 5 Dec 2011 by Profile Samuel
Post:
i think so too.
that's a very interessting topic.
28) Message boards : SETI@home Science : Large moons unnecessary for stable planet ecospheres? (Message 1175681)
Posted 4 Dec 2011 by Profile Samuel
Post:
that's true. Everthing we see now is the result of an 3,8 billion year old coevolution and symbiotic interactions between the organisms on earth.
the plant fixate the CO2 by creating carbohydrates and create energy via the light reactions (therefor they use H20 and create O2).
heterotropic orangisms like us burn the carbohydrates by using O2 and creating CO2 and H2O.- the cycle is closed.
A very efficient system.
But maybe life on other planets use different biochemical ways.
29) Message boards : SETI@home Science : Large moons unnecessary for stable planet ecospheres? (Message 1175663)
Posted 4 Dec 2011 by Profile Samuel
Post:

Oxygen atmosphere with enough Nitrogen to prevent burning the place down.


Live on earth started without O2... At this time O2 was very toxic for all lifeforms.
the first cyanobacteria used H2S as e- Donator. But 3- 2,8 billion years ago- most of the H2S was depleted.
So the cyanobacteria used H2O as e- Donator, and this form of photosynthesis created O2. a mass extinction followed.
later the organisms learned to detoxify O2 (mitochondria) and use O2 for their own metabolism.
the big advantage:
- greater energy efficiency (metabolism creates much more energy (ATP) by using O2 than under anaerobic conditions)
- ozone (O3) which protects from UV- radiation

But is O2 really necessary for the evolution of high developed organisms?
30) Message boards : Science (non-SETI) : The Voyagers (Message 1165462)
Posted 26 Oct 2011 by Profile Samuel
Post:


A good question is whether the gold records attached to them might survive long enough to puzzle an ET discoverer...



The voyager record will be unreadable when it takes a damages of 10 percent. They calculated 2 percent damage for the first lightyear.
After the first lightyear, the record only takes a damage of 0,02 percent every 50ly.
So when the voyager reaches a distance of 5000ly. There will be a damage of 2percent (plus the first 2%)= 4%
But this calculation refers only to the outside of the record. the inside of the record is better protected. the roughly estimated lifspam is nearyl 1 billion years. And the informations are stored on this side.
31) Message boards : Science (non-SETI) : The Voyagers (Message 1165266)
Posted 25 Oct 2011 by Profile Samuel
Post:
The voayger record maybe has a lifspam of one billion years...
And in nearly 100 Million years the voyager will reach a distance of 5000 lj. (Sagan, Drake Murmurs of Earth 1980)

32) Message boards : News : more data on the way (Message 1150768)
Posted 10 Sep 2011 by Profile Samuel
Post:
But where are the Kepler Field WUs? (May 7 May 10 May 15 May 16 May 20 May 22 )
33) Message boards : SETI@home Science : For the folks who belive mars can have life. (Message 1148889)
Posted 4 Sep 2011 by Profile Samuel
Post:
The number of extremities and the type of locomotion maybe depends on the conditions of the the planet where the species live. if there is a high gravity the species may move pentpedal or there won't be any extremities (like a snake). A lower gravity may gives preferences to bipedal locomotion.
34) Message boards : SETI@home Science : For the folks who belive mars can have life. (Message 1145436)
Posted 26 Aug 2011 by Profile Samuel
Post:
Perhaps the process of evolution, natural selection, might be same in planets with conditions for life, as here on Earth.


I think so too. Evolution is characteristic for life.
And the evolution on earth had shown us that nature often finds the same solution for the same problem. Wings had been invented by birds, insekts and mammals, independent from each other. --- Convergent evolution ---
If there is a planet with similar conditions like our home plantet., nature might invent the same morphologic structures there.
35) Message boards : SETI@home Science : For the folks who belive mars can have life. (Message 1143875)
Posted 22 Aug 2011 by Profile Samuel
Post:
Hello.
Most biologists say that a Virus isn't a lifeform. Because a Virus don't have an own Metabolism (another criteria for life) and they need another cell to reproduce. Also they have only DNA OR RNA (for example retroviral viruses). All other lifeforms on earth have both DNA and RNA.

another criteria for life is evolution

Bakteria communicate via chemical signals. For example N-Acyl Homoserine Lactones (AHL), so they can measure the denistiy of the cell population.
Bacteria even can "communicate"/interact with high developed cells, like human cells- so they can outwit/trick the human immune system (sometimes)
36) Message boards : SETI@home Science : For the folks who belive mars can have life. (Message 1143037)
Posted 20 Aug 2011 by Profile Samuel
Post:
that's true.
have a look at Io, there you can find very strong volcanism because of the tidal forces. Europa is the second of the Galilean moons, and so he may become enough energy in form of tidal forces from jupiter for the evolution of life.
37) Message boards : SETI@home Science : For the folks who belive mars can have life. (Message 1143008)
Posted 20 Aug 2011 by Profile Samuel
Post:
the temperature on Titan is near the tripel point of Methan. So Methan may have the function of water there. But the problem is that Metan is a apolar (nonpolar) Molecule. A water molecule is a dipole, and this characteristic is very important for the life and biochemistry.

I think there are better chances to find life on Europa. In the past we thought that sunlight is neseccary for life on earth. But later we found ecosystems where the primary producers don't use sunlight. On Europa you may find the same situation (- black smokers).
Chemotrophic organisms can obtain energy only by the oxidation of electron donors. These elektron donors can be anorganic (vor example H2S) or organic. If there is vulcanism on Europa you can find all the requirements for these lifeforms.
38) Message boards : News : "Are We Alone?" The Great Debate (Message 1141536)
Posted 17 Aug 2011 by Profile Samuel
Post:
'They' may not want us to know they are there.


I think it's nearly impossible for them to hide. Because every lifeform leaves footprints. If they are intelligent they must use a kind of information transfer, and now/ or in the future we are/ or will be able to detect them.
39) Message boards : News : Green Bank Telescope observations to start Saturday. (Message 1107644)
Posted 19 May 2011 by Profile Samuel
Post:
Hello,
Do we will get informations about the results of this project when its finished? i mean any kind of results?
I have another question: maybe somewhere this question had been already answerd. But somewhere i read that it is possible to analyze the chemical composition of the atmosphere form an extrasolar planet via spectral analysis (looking vor O2, CH4, and stuff like that)
Do they try to analyze the athmosphere of this 90 Kepler field stars planets? Maybe thats a way to detect "lower" liveforms.

greetings
40) Message boards : News : "Are We Alone?" The Great Debate (Message 1082972)
Posted 2 Mar 2011 by Profile Samuel
Post:
it's sure that life in universe exists. But most of them would be like unicellular oranisms, because they can live in an extreme Environment (like thermophilic archaea).
But higher developed life(like vertebrate) need an "stable" Environmt for a long time (sure there had been a lot of mass exticntions in the history of our planet- but they had been necessary for the human development).

the paramter in our solarsystem are nearly perfect for the formation of live (the mass etc. of the sun (G2V), the mass of the earth, distance- earth moon, jupiter as a blockade for asteroids, the position of our solar system in our galaxy, the proportion of Elements heavier as He, "stable Neighbourhood" without cosmic disasters like supernovas etc...). All this parameter are nearly perfectly set, that it looks like mere chance that we exist.
However; i think human beeings define intelligene in a very anthropological view- But tell me are oranisms which destroy there Environment they are living in intelligent? I dont think so. And so i think that Civilizations, which are able to communicate with human beeings only have a very short life span (because they erase themselves). And so its very implausible to find a signal.

But there is a chance, and if there is a chance we should take it.

Excuse my bad english [/i]


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