Search found 396 matches

by ImagingGeek
Fri Jan 10, 2014 11:41 pm UTC
Forum: Fictional Science
Topic: Is an intelligent egg-laying alien race possible?
Replies: 115
Views: 28843

Re: Is an intelligent egg-laying alien race possible?

It's a hard limitation, but I don't think they ever pointed to hip size being the limiting factor (as I cited in the study beforehand, it's not the main limitation). And again, however limiting the hip size is, I still don't see how egg laying is going to get around that issue. You still have to po...
by ImagingGeek
Fri Nov 15, 2013 1:22 am UTC
Forum: Science
Topic: Early Human Diet
Replies: 63
Views: 10599

Re: Early Human Diet

I don't think diet really mattered that much to our early human ancestors, because they didn't live for 70 years. Jplus beat me to this, but its worth repeating - this concept is wrong. Means do not represent a population very well. Paleohistorically ~50% of people died by age 5. The survival curve...
by ImagingGeek
Tue Oct 29, 2013 11:51 am UTC
Forum: Science
Topic: Physics/engineering help - heating
Replies: 9
Views: 3083

Re: Physics/engineering help - heating

Billy - yes, I am controlling the heater, but temperature spikes are an issue. I built a similar system in the past and had huge problems - the issue is simply that heat transfer through the system is not instantaneous. So if the thermistor is near the sample (whose temperature we're trying to main...
by ImagingGeek
Mon Oct 28, 2013 10:15 pm UTC
Forum: Science
Topic: Physics/engineering help - heating
Replies: 9
Views: 3083

Re: Physics/engineering help - heating

Billy - yes, I am controlling the heater, but temperature spikes are an issue. I built a similar system in the past and had huge problems - the issue is simply that heat transfer through the system is not instantaneous. So if the thermistor is near the sample (whose temperature we're trying to maint...
by ImagingGeek
Mon Oct 28, 2013 6:53 pm UTC
Forum: Science
Topic: Physics/engineering help - heating
Replies: 9
Views: 3083

Re: Physics/engineering help - heating

The air velocity should be nearly zero, as the scope is in a low-draft room and we generally try to avoid generating air currents as we have biocontainment hoods in the same room (which don't do well with air currents), so convections should be largely limited to the air movement due to heating. I'm...
by ImagingGeek
Mon Oct 28, 2013 4:06 pm UTC
Forum: Science
Topic: Physics/engineering help - heating
Replies: 9
Views: 3083

Physics/engineering help - heating

I need a bit of help. I'm building a heated stage for a microscope in my lab, and am planning on using thin-film heating elements. What I am trying to determine is which sized element I need to heat the stage, without being either underpowered or excessively over-powered. The heated component is mad...
by ImagingGeek
Wed Oct 02, 2013 2:28 pm UTC
Forum: Food
Topic: Bring your own beer - or the homebrewers resource thread
Replies: 70
Views: 40745

Re: Bring your own beer - or the homebrewers resource thread

Thanx!

I've done dog treats like those in the past. My dog will eat anything, so she gobbled those down. I have to admit - the dog treats made pretty good people treats as well.

Bryan
by ImagingGeek
Wed Oct 02, 2013 1:00 pm UTC
Forum: Food
Topic: Bring your own beer - or the homebrewers resource thread
Replies: 70
Views: 40745

Re: Bring your own beer - or the homebrewers resource thread

So are you going to share that muffin recipe, or do I have to beg? <we need a begging smily> I sometimes make bread out of some of my used grain; here's my recipe: 1 1/8 cups water 2 1/2 cups white bread flour 1/2 cups wheat bread flour 1 1/2 Tbsp. dry milk 1 1/2 Tbsp. honey 1 1/2 tsp. salt 2 Tbsp. ...
by ImagingGeek
Tue Oct 01, 2013 7:49 pm UTC
Forum: Science
Topic: Toxin concentration from vegetables
Replies: 6
Views: 2319

Re: Toxin concentration from vegetables

My first instinct is to point out that nature/evolution intends nothing - there is no foresight or plan to evolution; evolution is simply population genetics + mutations shaped by 'forces' such as selection and drift. My second instinct is to point out the "first rule of pharmacology" - th...
by ImagingGeek
Tue Oct 01, 2013 12:42 pm UTC
Forum: Food
Topic: Bring your own beer - or the homebrewers resource thread
Replies: 70
Views: 40745

Re: Bring your own beer - or the homebrewers resource thread

Surgical, sorry I'm late. Your method looks good but for one thing - its normal to steep adjunct grains for 20-30 minutes, not an hour. Hour-long soaks are generally for mashing, which requires a base malt (and must be done at very specific temps) - your recipe has only adjuncts, so a long soak is n...
by ImagingGeek
Tue Sep 17, 2013 12:49 pm UTC
Forum: Science
Topic: vertical lines in the oceans?
Replies: 10
Views: 3480

Re: vertical lines in the oceans?

My guess is stitching errors generated by combining images from a polar-orbiting satellite. They are larger/more obvious at the equator (I think) as the earths surface is rotating faster there, relative to satellite orbit.

Bryan
by ImagingGeek
Tue Sep 17, 2013 12:42 pm UTC
Forum: Food
Topic: Bring your own beer - or the homebrewers resource thread
Replies: 70
Views: 40745

Re: Bring your own beer - or the homebrewers resource thread

Be careful with cider - because the nutrient and protein levels are low, fermentation can take a long time. A real 'burst' of fermentation near the beginning is normal, but it may take a few weeks for the SG to stabalize. This is especially important if bottling afterwards - I've had a few cider bot...
by ImagingGeek
Fri Sep 13, 2013 7:22 pm UTC
Forum: School
Topic: Dear Universities,
Replies: 59
Views: 28174

Re: Dear Universities,

You need to go back and re-read those links I posted. They said the opposite - student evaluations do a very good job of judging teaching performance, and are good predictors of how well students taught by that instructor perform in the future - if the evaluations are structured correctly. As long ...
by ImagingGeek
Fri Sep 13, 2013 12:58 pm UTC
Forum: Food
Topic: Bring your own beer - or the homebrewers resource thread
Replies: 70
Views: 40745

Re: Bring your own beer - or the homebrewers resource thread

Star san rocks - no need to rinse, and a $12 bottle lasts for ever (1.6ml per litre, for any other metrisized brewers out there). I was hesitant to recommend it because Diemo already has VWP, and AFAIK it works quite well too. Just remeber, star san is a sanitizer only; it doesn't clean worth a damn...
by ImagingGeek
Fri Sep 13, 2013 12:53 pm UTC
Forum: Science
Topic: Estimating failure pressure for fermented tea
Replies: 3
Views: 2003

Re: Estimating failure pressure for fermented tea

If it involves booze, I'm usually the first one there.

But I think next time I wanna party with Izawwlgood...
by ImagingGeek
Thu Sep 12, 2013 8:31 pm UTC
Forum: Fictional Science
Topic: Motivations of Aliens to Visit Earth
Replies: 135
Views: 37980

Re: Motivations of Aliens to Visit Earth

Why would aliens from light years away have any interest in visiting Earth? Well, if star trek taught me anything, those aliens will have near-human physiology and might come here for some alien-on-human horizontal polka :mrgreen: Assuming we're limiting our sci-fi discussion to otherwise realistic...
by ImagingGeek
Thu Sep 12, 2013 8:13 pm UTC
Forum: Science
Topic: Estimating failure pressure for fermented tea
Replies: 3
Views: 2003

Re: Estimating failure pressure for fermented tea

Aside from running an experiment, there is no easy way to do it. That said, most beer bottles are rated to safely hold 3 ATA's worth of pressure (meaning their failiure point is probably near 6 ATA), while champaign bottles can hold upwards of 30ATA. So if you work with beer-like CO2 volumes you sho...
by ImagingGeek
Thu Sep 12, 2013 8:06 pm UTC
Forum: Food
Topic: Bring your own beer - or the homebrewers resource thread
Replies: 70
Views: 40745

Re: Bring your own beer - or the homebrewers resource thread

Its been so long since anyone posted here (about 12 batches of homebrew, by my reckoning. . .which may mean that I have a problem) that I forgot to look. A few answers... So, I'm thinking about making bottling easier by getting an auto-siphon and putting a pvc ball-valve at the end of the siphon tub...
by ImagingGeek
Thu Jul 11, 2013 1:40 pm UTC
Forum: Science
Topic: Homeopathy and Placebo Effectiveness
Replies: 14
Views: 7613

Re: Homeopathy and Placebo Effectiveness

Hmm... a very scientific response (and interesting) but somewhat dismissive... almost all illnesses - particularly chronic ones - have a pain or other component that could well benefit from effective placebos (nausea, fatigue, etc.). I work in healthcare IT, and I also have a family member with ser...
by ImagingGeek
Thu Jul 11, 2013 1:31 pm UTC
Forum: School
Topic: Dear Universities,
Replies: 59
Views: 28174

Re: Dear Universities,

For example, my experiences at two Research I institutions (undergrad and grad) is closer to puppyclaw's experiences than yours Were the research institutions universities, or research institutions? You cannot compare one to the other - I did my post-doc in an RI in order to immerse myself as compl...
by ImagingGeek
Thu Jul 11, 2013 12:59 pm UTC
Forum: School
Topic: Dear Universities,
Replies: 59
Views: 28174

Re: Dear Universities,

1. graduate programs care considerably more about my GPA than how much I know (which is nigh impossible for them to assess and they don't even look at it until you pass the GPA hurdle) This is one of my pet peeves. The best grad student in my lab had a "low" GPA - I actually had to fight ...
by ImagingGeek
Thu Jul 11, 2013 12:52 pm UTC
Forum: School
Topic: Dear Universities,
Replies: 59
Views: 28174

Re: Dear Universities,

As for those studies, is a panel of experts really the best way to evaluate that? Whom else would you go to? But, as some of those studies showed, the student-ratings of their teachers were good predictors of other factors independent of expert review - i.e. student performance in future courses, s...
by ImagingGeek
Thu Jul 11, 2013 12:44 pm UTC
Forum: School
Topic: Dear Universities,
Replies: 59
Views: 28174

Re: Dear Universities,

I find it interesting that you insist that what you describe is absolutely "the norm" when a prevailing view both inside and outside of academia is that large research universities do not care about educating undergraduate students. It's "publish or perish" not "teach or pe...
by ImagingGeek
Tue Jul 09, 2013 8:41 pm UTC
Forum: Science
Topic: Homeopathy and Placebo Effectiveness
Replies: 14
Views: 7613

Re: Homeopathy and Placebo Effectiveness

I don't think any studies have been done for the explicit purpose of maximizing placebo 'effectiveness', but enough work on placebos has been done for us to be able to propose methods to do just that. . .and most have been mentioned already. Basically, anything that creates the mental expectation in...
by ImagingGeek
Tue Jul 09, 2013 8:31 pm UTC
Forum: Science
Topic: Evolution and STDs
Replies: 12
Views: 4944

Re: Evolution and STDs

There have been a lot of good answers in this thread. But its worth pointing out that the fundamental assumption of this thread - i.e. promiscuity = bad - is probably untrue. Promiscuity = more unique genetic combinations = better chance of getting a good mix of genes. Population genetic studies on ...
by ImagingGeek
Tue Jul 09, 2013 8:14 pm UTC
Forum: School
Topic: Dear Universities,
Replies: 59
Views: 28174

Re: Dear Universities,

OR, consider that my professors were not you, and my school is not yours? A large number of my classes were taught by people who were graduate students on their way out the door or MA's on their way out the door, moving across the country when the semester was over, the eval did not significantly e...
by ImagingGeek
Fri Jul 05, 2013 2:19 pm UTC
Forum: School
Topic: Dear Universities,
Replies: 59
Views: 28174

Re: Dear Universities,

Angua wrote:Mine said they retyped all the answers so it would stay anonymous.

That is what happens here; we don't see the originals, we see histograms + means/medians of the scores, and typed versions of the comments.

B
by ImagingGeek
Fri Jul 05, 2013 2:18 pm UTC
Forum: School
Topic: Dear Universities,
Replies: 59
Views: 28174

Re: Dear Universities,

As a student I found evals frustratingly useless. I was either evaluating professors who had tenure where the school did not care about their teaching anyway Hate to break it too you, but most of us - even the tenured - care quite a bit about our teaching and work hard to get it right. Moreover, an...
by ImagingGeek
Wed Jun 05, 2013 4:11 pm UTC
Forum: Fictional Science
Topic: Exploding arrows
Replies: 51
Views: 28206

Re: Exploding arrows

So the overall distribution of mass isn't very important. The main issue is that the force is applied at the back of the arrow, and the weight is at the front, which means that if anything is off kilter, that eccentricity is going to become rapidly exaggerated in flight. Actually, no. Arrows and ro...
by ImagingGeek
Tue May 14, 2013 6:57 pm UTC
Forum: Science
Topic: Evolution question - how does complexity arise?
Replies: 201
Views: 29219

Re: Evolution question - how does complexity arise?

I'm not saying that motility should be an indicator of complexity, I'm just pointing out that our intuition behind complexity does seem to take it into consideration. I'm not proposing a definition, but my I am pointing out that whenever we sit in our armchair and say "organism A definitely se...
by ImagingGeek
Tue May 14, 2013 3:50 pm UTC
Forum: Science
Topic: Evolution question - how does complexity arise?
Replies: 201
Views: 29219

Re: Evolution question - how does complexity arise?

So do plants - it isn't via magic that they keep their leaves orientated towards the sun... Certainly, but only if you stare at them carefully enough. That's my point, that the perceived complexity of something actually depends on the level of detail at which you study it. I don't think we actually...
by ImagingGeek
Tue May 14, 2013 3:41 pm UTC
Forum: Science
Topic: Evolution question: Why DON'T niches get filled
Replies: 61
Views: 9865

Re: Evolution question: Why DON'T niches get filled

...snip... Nicely put. I wish I could remember where that article was that seemed to show that rates of mutation ARE non-optimal (let alone showing any signs of feedback). As a side-note, Greg Bear's book (and the sequel I assume - I only read the first one), "Darwin's Radio", dealt with ...
by ImagingGeek
Mon May 13, 2013 6:59 pm UTC
Forum: Music
Topic: Instruments you wish you played
Replies: 86
Views: 90113

Re: Instruments you wish you played

I grew up playing guitar, saxophone and piano. I which I could still play then; I own the former 2, so I don't really have an excuse...
by ImagingGeek
Mon May 13, 2013 6:19 pm UTC
Forum: Science
Topic: Evolution question - how does complexity arise?
Replies: 201
Views: 29219

Re: Evolution question - how does complexity arise?

I think it's also important to distinguish between the different scales or levels on which we evaluate complexity if we're going to come up with a proper definition. At least part of the reason we intuitively think mammals are more complex than tomatoes is because mammals have visible moving parts ...
by ImagingGeek
Mon May 13, 2013 3:52 pm UTC
Forum: Science
Topic: Evolution question - how does complexity arise?
Replies: 201
Views: 29219

Re: Evolution question - how does complexity arise?

So, would you say that there is no reasonable criteria for stating that a mammal is more complex than a tomato? To the contrary, I'd say that any measures of complexity are bound to be biased towards whatever people consider important, rather than being a truly objective measure. Note that I disagr...
by ImagingGeek
Mon May 13, 2013 1:20 pm UTC
Forum: Science
Topic: Evolution question - how does complexity arise?
Replies: 201
Views: 29219

Re: Evolution question - how does complexity arise?

Well, our genome is doing something more complex than a tomato's - whatever that is, does it really avoid definition? But is it? Humans have 18,000-23,000 genes; any particular cell type expresses between 5,000 and 6,000 of those genes. Tomatoes have over 30,000 genes (despite a smaller genome) and...
by ImagingGeek
Mon May 13, 2013 1:09 pm UTC
Forum: Science
Topic: Best proofs of evolution
Replies: 392
Views: 55515

Re: Best proofs of evolution

What tells me that something had to be a mutation? What if it was geographic migration? If I had generations A, B, C, etc, I could erroneously assign C to be the ancestor of A. How would I prevent that error and what should I look for? All variation ultimately arises from mutation; migration simply...
by ImagingGeek
Fri May 10, 2013 1:23 pm UTC
Forum: Science
Topic: Evolution question: Why DON'T niches get filled
Replies: 61
Views: 9865

Re: Evolution question: Why DON'T niches get filled

Evolution was explained to me as a drive to fill a niche. An asteroid wipes out all the big animals, but those big animals filled niches, so the remaining little animals diversify, evolve to fill the niches, and now we have big animals again. Others have touched on this, but its worth stating this ...
by ImagingGeek
Wed May 01, 2013 9:06 pm UTC
Forum: Fictional Science
Topic: Lamarckian Evolution
Replies: 5
Views: 4596

Re: Lamarckian Evolution

for it to be correct, you'd basically have to ignore the fact that life is made of cells which have DNA. Or you'd have to postulate some sort of mechanisms that can back-write successful changes into the DNA. Not plausible with earthly biology, but as this is a fictional science forum, one could po...
by ImagingGeek
Wed May 01, 2013 9:04 pm UTC
Forum: Science
Topic: Recognizing proteins -MS
Replies: 2
Views: 1460

Re: Recognizing proteins -MS

Firstly, in MS there is no single antigen; different patients will have B and T cells that recognize different mylein proteins. There are common antigens - for example, mylein basic protein - but these antigens are far from universal, and any one patient will recognize a number of different antigens...

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