Because my standard books nearly ALL cost 100+$ USD. And thats AFTER finding the cheapest price online instead of getting ripped off the additional 30% by the local bookstore. (Often used books can come in at under 100, but many of these still are very expensive).
Basically, the chitosan becomes charged in solution (i.e. the water from your blood), as the protons are ripped off by solutions with a pH of 6.5 or higher (blood has a pH of ~7.4).
I call bullshit on the in-article explination as to how it works...
"Gregory, who co-founded HemCon, says chitosan interacts with our blood cells because its molecules carry a positive charge. "The outer membrane of a red blood cell has a negative charge," he explains, "and opposite charges attract. The red cell is attracted to the positively-charged chitosan, and when it touches, it fuses and forms a blood clot.""
First.. I do not believe that the outer membrance of a red blood cell has a "charge" nor does this chitosan.. something tells me this CEO has a poor understanding of how his product works, and the simplification that had been made to him by the scientists working on it obviously got oversimplified in his head. Molecules simply do not exist sitting in a bandage with a positive charge.
Does anyone know how this really works in more detail? I have a suspicion it has something to do with matching polarities of ends of molecules or something like that.. but it seems very unclear from the description why the bandage works. I mean, if it works as described, then any negatively "charged" (whatever that means) substance should work in the same manner.
Sigh.. is it too much to ask for a real scientific explination ?
You know people.. when i was typing the story in, I knew it was wrong.. I saw it, and my english teaching said.. nooooo.. but then the rest of me said.. I Dont CARE !
Welcome to boston... If you cant drive with extreme predjudice.. well.. either walk, in which case you become moving targets for the rest of the boston drivers (or better yet, bike.. we get more points that way), or just drive in the rightmost lane (although, from your description, that might not even be an option).
Having an underpowered car is, unfortunately, your problem, and not ours.
You clearly have not driven in Massachusetts, where Rt 128 (aka interstate 95, but real MA people will never call it that) is marked at 55 Mph, and it's suicide to drive under 65 on that road. Most people go 70-80.
These are the time offsets that you can set in iTunes or another player, to get past the talking parts for each of the symphonies to get only the music part to play in your playlist: (minutes:seconds)
If you use iTunes, you can set the settings for that particular song (right click/ control click on the song, "get info", then go to options and set "start time" such that it skips the talking).
Abstract from the actual Science article:: Much more informative than this silly article.
Premelting is the localized loss of crystalline order at surfaces and defects for temperatures below the bulk melting transition. It can be thought of as the
nucleation of the melting process. Premelting has been observed at the surfaces of crystals, but not within. We report observations of premelting at grain boundaries
and dislocations within bulk colloidal crystals using real time video microscopy. The crystals are equilibrium close-packed three-dimensional colloidal structures
made from thermally responsive microgel spheres. Particle tracking reveals increased disorder in crystalline regions bordering defects, the amount of which depends
on the type of defect, distance from the defect, and particle volume fraction. Our observations suggest interfacial free energy is the crucial parameter for
premelting, in colloidal and atomic scale crystals.
Unfortunately, I believe there are natural nucleation spots built into a crystal.. that is, where the crystalline material ends and meets the atmosphere... In an idealized crystal, say, a NaCl crystal structure that has a 6:1 coordination for each atom of Na to Cl (or vice versa), the corners of the perfect crystal would only coordinate to 3 of the opposite atom, causing some sort of a difference in the suceptibility of the atoms at the very surface or corners of the crystal (I've actually always been somewhat curious as to how crystals "terminate"). In any case, this would likely be where the melting would start.
As a chem major, i've seen plenty of super cooled liquids, but never seen a superheated solid (although it's completely possibly i'm just unexposed to such a phenomenon), and I would guess because it's because of the reason i just cited (although, I admit, it's pure speculation). Also, perfect "single" crystals (as used in good Xray diffraction experiments) are somewhat difficult to form from even relatively simple compounds (it's even more trying with complex organic compounds).
The only superheating i know of is of a liquid above it's boil point (again, like with liquid to solid , needs nucleation points)
Accuracy ?
on
How Ice Melts
·
· Score: 2, Interesting
At least the way the article describes the study.. it doesnt seem like it models the problem well.. but something tells me these arent the greatest writers here... For instance:
"So Yodh's team made some big atoms. Specifically, they made see-through crystals that are like small beads and are visible in an optical microscope."
By "see-through crystals" i'm assuming they mean optically transparent crystals constructed from small beads, not crystals that are like beads that then form a larger crystal structure, although from the wording, it's impossible to tell.
"The spheres swell or collapse significantly with small changes in temperature, and they exhibit other useful properties that allow them to behave like enormous versions of atoms for the purpose of our experiment,"
As far as I know.. atoms dont significantly change size when temperature changes.... they change how fast they move. I dont really see how size-changing beads model water molecules here, unless it's on a macroscale where a molecules are considered to expand as a group with increased temperature... but that sort of would defeat the pupose of the whole study...
On the other hand.... I think that the research is probably solid, espcially if it's being published in Science, a extremely selective journal. I think the article just fails to explain it well, and takes quotes out of context. Sadly, this is all too common in scientific journalism.
Not suprising
on
How Ice Melts
·
· Score: 3, Interesting
This is somewhat akin to boiling really, at least from my perspective.. small nucleation points, that spread throughout the liquid or crystal, effecting an overall phase change when the energy distribution reaches a point such that the majority of atoms prefer the gaseous or liquid state (depending on the phase change).
Yea, but so does Microsoft and Symantec, and you dont see Microsoft buying up... oh wait...
Seriously though, two companies selling computer services to corporations does not really qualify as enough overlap, there's gotta be something more to make a merger like this work.
Sigh.. I hate to defend what I think it a very broad patent (which appears to be being abused to some extent), but it's not really all that "blindingly obvious". Before WinAmp and iTunes and some other predecessors, to my knowledge the MP3 Jukebox software as we know it did not really exist.
Does anyone else see this as a potentially very good thing for GCC ? I could see apple taking some time to optimize GCC for SSE and contributing back to the project in a big way.
Slashdot Mirror
Anyone see it as odd that the google stock quote is listed above the MSFT/Yahoo stock quotes?
almost as if they couldnt help paying homage to the original...
Question: Are you in college?
Because my standard books nearly ALL cost 100+$ USD.
And thats AFTER finding the cheapest price online instead of getting ripped off the additional 30% by the local bookstore. (Often used books can come in at under 100, but many of these still are very expensive).
Some searching yields the explination:
http://en.wikipedia.org/wiki/Chitosan
Basically, the chitosan becomes charged in solution (i.e. the water from your blood), as the protons are ripped off by solutions with a pH of 6.5 or higher (blood has a pH of ~7.4).
I call bullshit on the in-article explination as to how it works...
"Gregory, who co-founded HemCon, says chitosan interacts with our blood cells because its molecules carry a positive charge. "The outer membrane of a red blood cell has a negative charge," he explains, "and opposite charges attract. The red cell is attracted to the positively-charged chitosan, and when it touches, it fuses and forms a blood clot.""
First.. I do not believe that the outer membrance of a red blood cell has a "charge" nor does this chitosan.. something tells me this CEO has a poor understanding of how his product works, and the simplification that had been made to him by the scientists working on it obviously got oversimplified in his head. Molecules simply do not exist sitting in a bandage with a positive charge.
Does anyone know how this really works in more detail? I have a suspicion it has something to do with matching polarities of ends of molecules or something like that.. but it seems very unclear from the description why the bandage works. I mean, if it works as described, then any negatively "charged" (whatever that means) substance should work in the same manner.
Sigh.. is it too much to ask for a real scientific explination ?
And this is why people like you, dont run the country.
"If 7 more deaths means that *real* science can get more money, then I'm all for it."
I'm a "real" scientist (chemist), and I never should want anyone to have to die because of my work.
They did bother with Dell, and they said they'd respond in time.
RTFA
You know people.. when i was typing the story in, I knew it was wrong.. I saw it, and my english teaching said.. nooooo.. but then the rest of me said.. I Dont CARE !
And the organic wastes... come from... suprise.. oil.
P.S. Most cars go from 0-60 in under 10 seconds...
If your living in boston, it better be under 6.
Welcome to boston... If you cant drive with extreme predjudice.. well.. either walk, in which case you become moving targets for the rest of the boston drivers (or better yet, bike.. we get more points that way), or just drive in the rightmost lane (although, from your description, that might not even be an option).
Having an underpowered car is, unfortunately, your problem, and not ours.
You clearly have not driven in Massachusetts, where Rt 128 (aka interstate 95, but real MA people will never call it that) is marked at 55 Mph, and it's suicide to drive under 65 on that road. Most people go 70-80.
These are the time offsets that you can set in iTunes or another player, to get past the talking parts for each of the symphonies to get only the music part to play in your playlist: (minutes:seconds)
1: 3:00
2: 2:12
3: 2:59
4: 1:19
5: 1:11
6: 2:16
7: 1:55
8: 3:11
9: 2:38
I copy those slow speeds in the US.. i'm getting 4.4 on a pipe that I regularly pull 400k+/sec from.
If you use iTunes, you can set the settings for that particular song (right click/ control click on the song, "get info", then go to options and set "start time" such that it skips the talking).
Abstract from the actual Science article:: Much more informative than this silly article. Premelting is the localized loss of crystalline order at surfaces and defects for temperatures below the bulk melting transition. It can be thought of as the nucleation of the melting process. Premelting has been observed at the surfaces of crystals, but not within. We report observations of premelting at grain boundaries and dislocations within bulk colloidal crystals using real time video microscopy. The crystals are equilibrium close-packed three-dimensional colloidal structures made from thermally responsive microgel spheres. Particle tracking reveals increased disorder in crystalline regions bordering defects, the amount of which depends on the type of defect, distance from the defect, and particle volume fraction. Our observations suggest interfacial free energy is the crucial parameter for premelting, in colloidal and atomic scale crystals.
Perhipherial support of my argument that I found after looking around:
o at.html
http://phycomp.technion.ac.il/~phsorkin/Seminar/c
Unfortunately, I believe there are natural nucleation spots built into a crystal.. that is, where the crystalline material ends and meets the atmosphere... In an idealized crystal, say, a NaCl crystal structure that has a 6:1 coordination for each atom of Na to Cl (or vice versa), the corners of the perfect crystal would only coordinate to 3 of the opposite atom, causing some sort of a difference in the suceptibility of the atoms at the very surface or corners of the crystal (I've actually always been somewhat curious as to how crystals "terminate"). In any case, this would likely be where the melting would start. As a chem major, i've seen plenty of super cooled liquids, but never seen a superheated solid (although it's completely possibly i'm just unexposed to such a phenomenon), and I would guess because it's because of the reason i just cited (although, I admit, it's pure speculation). Also, perfect "single" crystals (as used in good Xray diffraction experiments) are somewhat difficult to form from even relatively simple compounds (it's even more trying with complex organic compounds). The only superheating i know of is of a liquid above it's boil point (again, like with liquid to solid , needs nucleation points)
At least the way the article describes the study.. it doesnt seem like it models the problem well.. but something tells me these arent the greatest writers here... For instance:
"So Yodh's team made some big atoms. Specifically, they made see-through crystals that are like small beads and are visible in an optical microscope."
By "see-through crystals" i'm assuming they mean optically transparent crystals constructed from small beads, not crystals that are like beads that then form a larger crystal structure, although from the wording, it's impossible to tell.
"The spheres swell or collapse significantly with small changes in temperature, and they exhibit other useful properties that allow them to behave like enormous versions of atoms for the purpose of our experiment,"
As far as I know.. atoms dont significantly change size when temperature changes.... they change how fast they move. I dont really see how size-changing beads model water molecules here, unless it's on a macroscale where a molecules are considered to expand as a group with increased temperature... but that sort of would defeat the pupose of the whole study...
On the other hand.... I think that the research is probably solid, espcially if it's being published in Science, a extremely selective journal. I think the article just fails to explain it well, and takes quotes out of context. Sadly, this is all too common in scientific journalism.
This is somewhat akin to boiling really, at least from my perspective.. small nucleation points, that spread throughout the liquid or crystal, effecting an overall phase change when the energy distribution reaches a point such that the majority of atoms prefer the gaseous or liquid state (depending on the phase change).
Do you mean that the energy is reused or 50% additional ?
He he... CRAC units.
Yea, but so does Microsoft and Symantec, and you dont see Microsoft buying up... oh wait...
Seriously though, two companies selling computer services to corporations does not really qualify as enough overlap, there's gotta be something more to make a merger like this work.
Maby i'm just very thick... but... why would these two companies merge ? (is it a really merger btw, or really one company buying out the other?)
A large storage company, and a maker of security software? Where's the "synergy" ? Maby i'm missing a concept or two...
What will the merger offer.. "virus protected databases" ?
Someone please clue me in here....
Cracked likely...
alphanumeric... perhaps.. but a little long there...
more likey: "Most Common Surnames in the U.S.", something i'd definately add to my wordlist....
TREXLER shows up... apply dictionary rules, add potential numbers in front, bingo.. there's the password.
Sigh.. I hate to defend what I think it a very broad patent (which appears to be being abused to some extent), but it's not really all that "blindingly obvious". Before WinAmp and iTunes and some other predecessors, to my knowledge the MP3 Jukebox software as we know it did not really exist.
Does anyone else see this as a potentially very good thing for GCC ? I could see apple taking some time to optimize GCC for SSE and contributing back to the project in a big way.