Search found 60 matches

by James Scott-Brown
Tue May 04, 2010 9:09 pm UTC
Forum: Science
Topic: Amphoteric
Replies: 19
Views: 2464

Re: Amphoteric

However, saying that: JSB, the full definition in the gold book for amphoteric is: A chemical species that behaves both as an acid and as a base is called amphoteric. This property depends upon the medium in which the species is investigated: H2SO4 is an acid when studied in water, but becomes amph...
by James Scott-Brown
Sun May 02, 2010 8:55 pm UTC
Forum: Science
Topic: The immense joy of diuretic exeriments
Replies: 3
Views: 1641

Re: The immense joy of diuretic exeriments

Given the experimental set-up, I'd want to use one-way anova with tukey post-hoc testing, given that the they emphasized 'making valid comparisons between treatment groups.' Is there a way to do this with only the mean data, and not the raw data itself? It is possible that you are over-complicating...
by James Scott-Brown
Sun May 02, 2010 8:50 pm UTC
Forum: Science
Topic: Amphoteric
Replies: 19
Views: 2464

Re: Amphoteric

oxoiron - IUPAC use amphoteric in the definition to refer to Bronsted acidity. I think insisting it only means Lewis acidity is somewhat confusing. Where? In the Gold Book, Bronsted acidity is mentioned in the definition of "amphiprotic", but not "amphoteric": "amphoteric&q...
by James Scott-Brown
Tue Feb 16, 2010 10:30 pm UTC
Forum: Science
Topic: Nuclear test in a vacuum chamber
Replies: 4
Views: 1526

Re: Nuclear test in a vacuum chamber

Nope. Keep in mind that that radiation still carries all the energy otherwise present in the shockwave, so when it hits the wall the resulting vapourized material will just generate a shockwave of it own. Keep in mind the inverse-square law. Radiation intensity is inversely proportional to the squa...
by James Scott-Brown
Sat Jan 30, 2010 10:33 am UTC
Forum: Science
Topic: Chemistry "typing"?
Replies: 14
Views: 2268

Re: Chemistry "typing"?

For writing chemical formulae/equations in latex, the mhchem bundle is very useful. Just wondering... What happens when i get to organic chemistry and want to draw bond-line structures and show bond cleavages using curved arrows? :? If you start having to draw structures and mechanisms, you'll need ...
by James Scott-Brown
Sat Jan 30, 2010 10:27 am UTC
Forum: Science
Topic: Places that refuse to use IUPAC nomenclature...
Replies: 16
Views: 3190

Re: Places that refuse to use IUPAC nomenclature...

Am I the only one who finds this aggravating, especially after having spent more than 4 years of my life learning the "right" (read: IUPAC) way to talk about compounds? Well, I was never taught that IUPAC nomenclature was "right". I was taught that it was an international system...
by James Scott-Brown
Sun Jan 17, 2010 4:09 pm UTC
Forum: Science
Topic: Biology Questions
Replies: 27
Views: 8025

Re: Biology Questions

I wish there was more about Fungi in textbooks, at least. Protists are basically miscellaneous, so more of that is probably out of the question. But hyphae! Lichen! Cells with two nuclei! Fungi are weird . Ballistic spores! There's so much cool to know about. Prokaryotes don't get as much love as e...
by James Scott-Brown
Sat Jan 16, 2010 5:15 pm UTC
Forum: Science
Topic: Dialysis Tubing Lab - Need help
Replies: 9
Views: 2634

Re: Dialysis Tubing Lab - Need help

I was originally planning to pour an equal amount of water into a beaker(which the tube rests in) and into the tube to prevent osmosis, then pouring a certain amount of sugar solution into the beaker and wait for diffusion to take place. You do realize that whether osmosis occurs depends on the con...
by James Scott-Brown
Wed Jan 13, 2010 5:29 pm UTC
Forum: Science
Topic: An idea for a science website
Replies: 8
Views: 1655

Re: An idea for a science website

It sounds like you are proposing to systematise all of mathematics and science, which is . . . ambitious. To an extent, what you are describing does exist. The reasons for believing particular statements to be true are written in scientific papers published in journals [well, this has only been the ...
by James Scott-Brown
Wed Jan 06, 2010 5:37 pm UTC
Forum: Science
Topic: Molecular Compounds
Replies: 4
Views: 869

Re: Molecular Compounds

Yeah, the CO 2 vs CO problem is essentially one of oxygen availability vs carbon availability. As for the basic rule of which one of these possible reactions (given this set of reactants) is most likely; that essentially comes down to thermodynamics. specifically, which one is most achievable and r...
by James Scott-Brown
Wed Jan 06, 2010 5:24 pm UTC
Forum: Science
Topic: Script Swaps Poor YouTube Comments w/ Feynman Quotes
Replies: 18
Views: 2735

Re: Script Swaps Poor YouTube Comments w/ Feynman Quotes

The thing I'm waiting for is something like this that filters based on the stupidity of the content of the post, rather than the grammar of the post. There are some people who write decent stuff, yet get filtered out because they don't use capital letters or something. Of course, getting a computer...
by James Scott-Brown
Sun Jan 03, 2010 10:44 pm UTC
Forum: Science
Topic: Different alcoholic beverages and their effects
Replies: 18
Views: 2764

Re: Different alcoholic beverages and their effects

Well, I found a 2003 paper in Alcohol & Alcoholism from 2003; it says a literature search revealed no previous experimental comparisons of fizzy and non-fizzy champagne. So they compared normal and degassed champagne [produced by mixing with a blender], finding that "There were significant ...
by James Scott-Brown
Tue Dec 29, 2009 5:55 pm UTC
Forum: Science
Topic: Alkaloids and Opium
Replies: 4
Views: 995

Re: Alkaloids and Opium

XD Thank you~! Another thing I was wondering... are alkaloid drugs the opposite of like... acid/LSD? At least chemically? (I really do not know my chemistry, I'm afraid. ._.; ) Well, LSD isn't actually an acid; it is produced by reacting lysergic acid (a carboxylic acid) with diethylamine, forming ...
by James Scott-Brown
Thu Dec 17, 2009 8:04 pm UTC
Forum: Science
Topic: Brain Dump: The Theory of Everything
Replies: 10
Views: 2023

Re: Brain Dump: The Theory of Everything

If you wish to compile a rough timeline or outline of how the Earth, and life on it, came to exist, you may find Nigel Calder's Timescale interesting. I haven't yet read it, but intend to grab a copy when I next visit the library.
by James Scott-Brown
Wed Dec 16, 2009 6:51 pm UTC
Forum: Science
Topic: Think: What color do you associate Chemistry with?
Replies: 97
Views: 10091

Re: Think: What color do you associate Chemistry with?

Blue! Because (and I don't know if this is even true) my chemistry teacher said that electrons were blue. o_O I'm, um, pretty sure that doesn't make any sense. It's been a while since I studied what causes what EM emission, but... I'm pretty sure the photons that you can see were emitted when elect...
by James Scott-Brown
Fri Dec 04, 2009 8:12 pm UTC
Forum: Science
Topic: Help a biologist with thermodynamics!
Replies: 6
Views: 1197

Re: Help a biologist with thermodynamics!

Let me put it easier: The entropy of the system is reduced by the formation of a bilayer. But the system becomes more stable by formig layers in which the molecules are surrounded by favoured interactions. This means that the system looses energy which is emitted as heat. That additional heat incre...
by James Scott-Brown
Mon Nov 16, 2009 9:07 pm UTC
Forum: Science
Topic: Need the name of the equation that describes induced current
Replies: 12
Views: 1591

Re: Need the name of the equation that describes induced current

BlackSails wrote:Thats going to be really hard I think, because I doubt a solution of gold nanoparticles behaves as an ohmic conductor.


It probably will be very hard. I was once doing some work related to how gold nanoparticles scatter light scatter light (by Mie Scattering). The equations are not nice.
by James Scott-Brown
Fri Oct 16, 2009 10:34 pm UTC
Forum: Science
Topic: Figures figures figures!
Replies: 12
Views: 1643

Re: Figures figures figures!

Someone asked an almost identical question on Ask MetaFilter yesterday.

Personally, I draw most graphs in R (sometimes with subsequent touching-up in other applications).
by James Scott-Brown
Sat Sep 19, 2009 8:50 pm UTC
Forum: Science
Topic: Detailed Atomic Photos
Replies: 7
Views: 1165

Re: Detailed Atomic Photos

On a slightly related note, check this out. http://physicsworld.com/cws/article/news/40250 From August 2009? Whats the new part? It has been possible to get resolutions like that for several years. Well, the paper in Science states that "the complete chemical structure of an individual molecul...
by James Scott-Brown
Thu Sep 17, 2009 7:48 pm UTC
Forum: Science
Topic: contact general anesthetics
Replies: 12
Views: 1568

Re: contact general anesthetics

There are many rumors about criminals administering Scopolamine subcutaneously. However, they are largely unsubstantiated and exaggerated.

I would imagine that criminals would have little need for a contact general anaesthetic, given the ease of spiking a victim's drink.
by James Scott-Brown
Thu Sep 10, 2009 8:32 pm UTC
Forum: Science
Topic: Chemistry
Replies: 13
Views: 1687

Re: Chemistry

I don't know about the chemistry syllabus you would follow in New Zealand, but in the UK the limit of what you learn about "predicting the actual route that a reaction will take" with orbitals is essentially that pi bonds result in regions of high electron density above and below the bond ...
by James Scott-Brown
Mon Aug 31, 2009 6:02 pm UTC
Forum: Science
Topic: Enzyme denaturation in hot climates
Replies: 29
Views: 2250

Re: Enzyme denaturation in hot climates

Guys, putting this out here for all you to understand. On the scales we're talking about, the laws of thermodynamics hold. That means that a person who has an inner body temperature of 37 degrees Celsius in a 41 degree room does not radiate heat. radiation occurs the other way. Don't go saying that...
by James Scott-Brown
Sun Aug 30, 2009 10:10 pm UTC
Forum: Science
Topic: Enzyme denaturation in hot climates
Replies: 29
Views: 2250

Re: Enzyme denaturation in hot climates

That's convection, right - sweating I mean? I guess I should have written conduction originally. No, sweating causes Evaporative Cooling: in order to evaporate, the water in sweat requires energy (latent heat of vaporization), which it takes from its surroundings, including the skin beneath it. Con...
by James Scott-Brown
Sun Aug 30, 2009 7:45 pm UTC
Forum: Science
Topic: Enzyme denaturation in hot climates
Replies: 29
Views: 2250

Re: Enzyme denaturation in hot climates

No. Radiation plays a very little part here. Blood flow to skin is restricted when it is cold to preserve body heat, yes. Blood flow to skin is increased when hot to help get the heat away, yes. But the main mechanisms of heat loss is evaporation and convection. Radiation is usually minor. Hmm. My ...
by James Scott-Brown
Thu Aug 06, 2009 8:41 pm UTC
Forum: Science
Topic: Can Encephalitis lethargica ever come back again
Replies: 3
Views: 1264

Re: Can Encephalitis lethargica ever come back again

I don't think anyone has any idea. The Wikipedia page, which is where I got all my information, said that L-Dopa is only a treatment for symptoms. Given that there is no consensus on the cause, I can't say if we'd be able to treat it more effectively now. If it's autoimmune, precipitated by infecti...
by James Scott-Brown
Wed Jul 15, 2009 6:43 pm UTC
Forum: Science
Topic: Evolution on a molecular level
Replies: 21
Views: 3223

Re: Question

In one sense, mutation is not at all random. For just one example, if there is an A at a particular position in an organism's DNA, it's more likely to mutate to become G than to become C or T. Also, some positions in a given DNA molecule will be much more likely to mutate than others, for many diff...
by James Scott-Brown
Wed Jul 15, 2009 6:10 pm UTC
Forum: Science
Topic: A question on research/thesii(?)/scientific process
Replies: 14
Views: 1934

Re: A question on research/thesii(?)/scientific process

This then sparked a new thought about the scientific process. In the SP someone observes a phenomena and takes an educated guess as to what caused the phenomena. They then try and devise a way to test this hypothesis and then actually test it. When the results are analysed if the hypothesis is only...
by James Scott-Brown
Mon Jul 13, 2009 7:59 pm UTC
Forum: Science
Topic: Birds flying in a box
Replies: 9
Views: 1789

Re: Birds flying in a box

Didn't mythbusters do this? I haven't seen the episode, but apparently they tried it in Episode 77, using first birds and then a model helicopter. However, the accounts I've read suggest that the bird/toy helicopter was hovering in a fixed position, not accelerating so the apparent weight did not c...
by James Scott-Brown
Mon Jul 13, 2009 7:03 pm UTC
Forum: Science
Topic: Birds flying in a box
Replies: 9
Views: 1789

Re: Birds flying in a box

IANAPM, but my first impression: If the birds are accelerating upwards, then the vertical component of their momentum is increasing. The total momentum of the box and its contents will be conserved, and so the box will accelerate downwards, resulting in an increased force on the scales. The apparent...
by James Scott-Brown
Sun Jul 12, 2009 9:07 pm UTC
Forum: Science
Topic: Sugar Assay
Replies: 7
Views: 1327

Re: Sugar Assay

I'm gonna go with HPLC on this one, after a suitable sugar extraction proceedure. It should be quantitative, provided you run standards to determine the area under the curve for set amounts. Good idea. Hurray for instrumental methods. You could also try using IR spectroscopy. A quick google search ...
by James Scott-Brown
Sat Jul 11, 2009 1:18 pm UTC
Forum: School
Topic: Summer is killing meee :(
Replies: 10
Views: 2035

Re: Summer is killing meee :(

How about Professor Morin's undergraduate physics problem of the week?
Or a copy of 200 Puzzling Physics Problems?
by James Scott-Brown
Sat Jul 11, 2009 11:07 am UTC
Forum: Science
Topic: Sugar Assay
Replies: 7
Views: 1327

Re: Sugar Assay

Which sugars do you want to quantify? Glucose, fructose, sucrose (`table sugar'), amylose? All of the above? Also, what's the actual title of your project? Measuring sugar concentration may not actually be necessary. Next, how do you feel about titrations? :P I believe benedict's reagent is good for...
by James Scott-Brown
Wed Jul 08, 2009 7:30 pm UTC
Forum: Mathematics
Topic: Your favourite calculator
Replies: 43
Views: 5731

Re: Your favourite calculator

HP 15c. The best calculator ever made, if you can find one cheap enough (usually ~$300 used, no longer in production). EDIT: the 16c is also amazing if you're a low-level programmer, but again it's not going to be cheap. HP has released an emulator for the iPhone. They call it "an exact replic...
by James Scott-Brown
Tue Jul 07, 2009 8:37 pm UTC
Forum: Science
Topic: Old techniques--awesome results.
Replies: 16
Views: 1658

Re: Old techniques--awesome results.

Because I do a lot of low temperature and air-sensitive work, I'm rather partial to Dewar flasks , Schlenk lines and the attendant Schlenk flasks and tubes . The Royal Society of Chemistry's monthly magazine Chemistry World has a regular piece called "Classic Kit" describing the developme...
by James Scott-Brown
Sat Jul 04, 2009 6:19 pm UTC
Forum: Science
Topic: Greatest Idea Ever
Replies: 41
Views: 5655

Re: Greatest Idea Ever

Having just retired from medical practice I can tell you of a benign hack that would be outstandingly useful: If medical practitioners could feel what you are feeling - where the pain is, how bad it is, etc. - the standard of care and diagnosis would rocket. We could also suss out the malingerers o...
by James Scott-Brown
Sat Jul 04, 2009 5:37 pm UTC
Forum: Science
Topic: Liquid water
Replies: 6
Views: 1282

Re: Liquid water

It's not necessary apparently. It's been posted here before about bacteria etc that do not need oxygen/water and such like. However H2O is a basic building block of sugar, which is used for energy. So without H2O you need another form of energy/food for your organism. AFAIK, liquid water is needed ...
by James Scott-Brown
Fri Jun 26, 2009 6:59 pm UTC
Forum: Science
Topic: You might be a chemistry major if...
Replies: 139
Views: 42143

Re: You might be a chemistry major if...

. . .You laugh when someone calls `acetaminophenol' a full name, and insist on calling it N-(4-hydroxyphenyl)ethanamide
by James Scott-Brown
Thu Jun 25, 2009 2:15 pm UTC
Forum: Science
Topic: can haz neuroscience?
Replies: 19
Views: 2533

Re: can haz neuroscience?

Professor Ulness has fairly extensive lecture notes for his course on Physical Neuroscience at Concordia College.

Also take a look at MIT's OCW - MIT has many courses in Brain and Cognitive Science
by James Scott-Brown
Sat Jun 20, 2009 9:42 pm UTC
Forum: Science
Topic: Summer Reading Recommendations - High School
Replies: 13
Views: 1942

Re: Summer Reading Recommendations - High School

If you want to learn about neuroscience, I'd recommend any (and all) of Oliver Sack's books. However, they are more about neurology that molecular-level neuroscience. Awakenings describes using L-dopa to treat those with Encepthalitis Lethargica, and the temporary relief it offered from their parkin...
by James Scott-Brown
Fri May 08, 2009 6:48 pm UTC
Forum: Science
Topic: World without Iron
Replies: 31
Views: 7220

Re: World without Iron

Horseshoe crabs have copper based blood. As do some octopuses. And many insects have blood without iron complexes, too. Yes, some species use hemocyanin molecules for oxygen transport (which contains copper, rather than the iron found in haemaglobin). Some think that sea-squirts (tunicates) also us...

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