- PLOS Science Wednesday: Hi Reddit, we’re Eric C. Leuthardt, Joshua Shimony, and David Tran. We discovered the blood-brain barrier stays open after laser ablation surgery, creating opportunities for glioblastoma treatment, as described in PLOS ONE – Ask Us Anything!
- In the 70s we referred to non-coding DNA as junk DNA and it made up 98% out DNA structure. What do we know about that 98% nowadays? What don't we know?
- How much mass does the sun lose over its lifetime as a main sequence star by emitting light?
- What is it about grapefruit that interacts with some medications?
- Is the speed of sound on air affected by whether the sound wave is propagating with or against the direction of wind?
- Is there a statistical difference between asking voters to vote "yes" or "no" on a proposal?
- How do they polarize glass?
- Why is a cavity with a hole a good approximation of a black body?
- Were dinosaurs already dying out before the meteorite hit? We’re paleontologists who have just published a radical new theory on dinosaur extinction. Ask Us Anything about meteor strikes, fossils, what this means for modern species, and our favourite dinosaurs.
- How can polar regions of Venus measure -157°C when the average temperature of the planet is 462°C?
- Can neutrinos interact with materials or anything for that matter? If they can could they have the potential to generate energy from that interaction?
- When we rotate our head and want to stare forward, are our eyes moving in the opposite direction at the speed of which we are rotating our head, or are they just remaining stationary?
- Would HPLC or NMR be better for plant extracts?
- Do we know what causes auditory phenomena such as the "Windsor Hum"? If we do not, what are the main competing hypotheses?
- During a heart transplant, how do they switch from bypass to the next spliced vessels without major bleeding?
- Can Aldehydes, Carboxylic Acids and Ketones be dehydrated?
- How is autism diagnosed?
- How do we know that the structure and function of a protein is encoded within its amino acid sequence?
- Do other species perceive mirrors in the same way humans do?
- What is the physical significance of the Ricci and Kretschmann scalars?
- How does salt melt ice on roads, but is used to make ice cream freeze quicker?
- Why don't we see Turbulence in Quantum Mechanical Probabilities?
- How do I understand what complex units like kg·m^2·s^−3·A^−1 mean?
| Posted: 20 Apr 2016 05:17 AM PDT Hi Reddit, My name is Dr. Eric C. Leuthardt and I am professor of neurosurgery at Washington University. My research focuses on brain computer interfaces, advanced brain mapping and the development of new medical technologies. And my name is Joshua Shimony and I am an Associate Prof. of Neuroradiology at Washington University School of Medicine. My research focuses on advanced MRI imaging and its clinical applications. And I am David Tran, the chief of neuro-oncology in the department of neurosurgery at the University of Florida's College of Medicine. My research focuses on understanding the mechanism of cancer progression and on developing novel therapeutic approaches to cancer. We recently published a study titled Hyperthermic Laser Ablation of Recurrent Glioblastoma Leads to Temporary Disruption of the Peritumoral Blood Brain Barrier in PLOS ONE. We found that a laser system commonly used to kill brain tumors has an additional and significant benefit: It creates a temporary opening in the blood-brain barrier — a natural barrier that's normally efficient at blocking out chemicals and bacteria — to allow the passage of chemotherapy and immunotherapy drugs into the brain, for up to six weeks. This discovery could lead to new treatment protocols for glioblastoma, a very aggressive brain cancer that's highly resistant to standard treatment. We will be answering your questions at 1pm ET – Ask Us Anything! [link] [comments]  |
| Posted: 19 Apr 2016 01:23 PM PDT This has always peaked my interest. Do we know what purpose this portion of the DNA serves? [link] [comments]  |
| How much mass does the sun lose over its lifetime as a main sequence star by emitting light? Posted: 20 Apr 2016 04:02 AM PDT How much heavier was the sun at the beginning of being a main sequence star to the end? It should lose mass, since it emits light and conservation of energy etc. [link] [comments]  |
| What is it about grapefruit that interacts with some medications? Posted: 20 Apr 2016 01:24 AM PDT |
| Posted: 20 Apr 2016 04:25 AM PDT If two observers are equidistant from a sound, while one observer is upwind and the other downwind, will the sound wave reach both observers simultaneously? [link] [comments]  |
| Is there a statistical difference between asking voters to vote "yes" or "no" on a proposal? Posted: 19 Apr 2016 04:14 PM PDT For example "Should same sex marriage be made legal? yes/no" versus "should same sex marriage remain illegal? yes/no." Would the difference in phrasing have a statistically significant influence on the final result? I ask because I imagine voting "yes" might seem to have the more "positive" connotation. [link] [comments]  |
| Posted: 20 Apr 2016 03:59 AM PDT Evert time i google how polarized glass is made i get some non-technical stuff about how they are good for fishing, reduce glare, remove horizontal light waves. One article mentioned something about iodine crystals but didn't elaborate. I just want to know how they treat the glass to get the polarization effect. [link] [comments]  |
| Why is a cavity with a hole a good approximation of a black body? Posted: 20 Apr 2016 03:53 AM PDT Don't the walls absorb some energy, and also lose the energy? So it doesn't really absorb all the energy that is irradiated on it, because only the energy that enters the hole in the black body is fully absorbed. And even after that energy enters, it can leave through the sides (walls) of the black body, and not only through the hole. [link] [comments]  |
| Posted: 20 Apr 2016 06:09 AM PDT Hi, we're /u/DrManabuSakamoto and /u/DrChrisVenditti from the University of Reading in England. Manabu is the lead researcher, and Chris is a co-author, of this paper showing evolutionary decline in dinosaurs long before the meteorite which finished them off. Read the full paper here: http://rdg.ac/1pbZM9j. Some more info on this paper: http://phys.org/news/2016-04-dinosaurs-decline-asteroid-apocalypse.html Ask Us Anything about dinosaur extinction, evolution, paleontology, the rise of the mammals. You can find Dr Manabu on Twitter at @DrMamboBob Proof: https://twitter.com/UniofReading/status/722782652042903552 [link] [comments]  |
| How can polar regions of Venus measure -157°C when the average temperature of the planet is 462°C? Posted: 19 Apr 2016 09:18 PM PDT |
| Posted: 19 Apr 2016 10:19 PM PDT I've heard that neutrinos are all over the place zooming straight outta the sun and other far reaches of the universe, zipping through our bodies like no tomorrow, seems kinda wasteful don't ya think? Kinda like how a solar panel works, with a photon going in and science stuff happens and electricity comes out, could a neutrino "panel" be possible? Maybe not to generate electricity but some other form of energy? Would this energy be sufficient to power our machinery if it could? [link] [comments]  |
| Posted: 19 Apr 2016 12:43 PM PDT |
| Would HPLC or NMR be better for plant extracts? Posted: 19 Apr 2016 04:21 PM PDT I have little experience in either, but likely can receive help from around school. I have previously done LC-MS and would prefer to never do that again if possible. So far I don't see much difference in limitations with HPLC vs NMR as both will need us to buy standards for any compounds we're interested in, we'll need to lyophilize the plant tissue before extraction, ect. In your experience, is one easier/better/more reproducible/cheaper than the other? [link] [comments]  |
| Posted: 19 Apr 2016 11:24 AM PDT Question prompted by recent reports of the Windsor Hum reaching unprecedented levels: I'm aware that several other localities claim similar phenomena (Taos, Auckland, and others) - perhaps they are all the same phenomenon, perhaps not. Any comment and discussion on the topic is welcome. [link] [comments]  |
| Posted: 19 Apr 2016 11:35 AM PDT It seems like you can't finish suturing the anastomosis without trapping the bypass line, but if you have the bypass line inserted in a separate incision upstream of that leaves a huge hole for blood to come spurting out. [link] [comments]  |
| Can Aldehydes, Carboxylic Acids and Ketones be dehydrated? Posted: 19 Apr 2016 12:07 PM PDT Can Aldehyde's, Carboxylic Acids and Ketone's be dehydrated and if so though which method, would it be like an alcohol with concentrated sulphuric acid or vaporised over Al2O3? and can secondary a tertiary alcohols be dehydrated? [link] [comments]  |
| Posted: 19 Apr 2016 02:09 PM PDT I know the the psychological effects but want to know the neurological effects. [link] [comments]  |
| Posted: 19 Apr 2016 09:00 AM PDT |
| Do other species perceive mirrors in the same way humans do? Posted: 19 Apr 2016 09:10 AM PDT Today in my physics lecture the professor said that optical devices such as mirrors only work because of the psychology of the brain, but didn't really elaborate much further. So, I wondered if other animals see mirrors in the same way as humans, or if it is a totally different experience. [link] [comments]  |
| What is the physical significance of the Ricci and Kretschmann scalars? Posted: 19 Apr 2016 12:36 PM PDT For a Schwarzschild black hole the Ricci curvature scalar is 0 while the Kretschmann Curvature scalar is 48 G2 M2 c-4 r-6. What do these values actually mean for the spacetime surrounding a blackhole? [link] [comments]  |
| How does salt melt ice on roads, but is used to make ice cream freeze quicker? Posted: 19 Apr 2016 04:43 PM PDT |
| Why don't we see Turbulence in Quantum Mechanical Probabilities? Posted: 19 Apr 2016 03:37 PM PDT So i'm a bit confused about the properties of wave mechanics, and trying to understand certain phenomena, which may be talked about, but I've never seen anyone talk about it. Here is the example. We have a bowl of water, a stick and a ball. We start with the ball, in which we drop it into the water. The ball creates a sinusoidal wave along the surface. Waves and Chaos 1.png (http://imgur.com/bvyX5gE) We take the stick now, and run it through the bowl in a straight line from one end to the other. instead of a sinusoidal wave we get...well fairly complicated movement, but of note we get two, cyclonic and anticyclonic turbulence patterns. Waves and Chaos 2.png (http://imgur.com/Xq8Wpzp) Now here is where i take the leap of my understanding and jump off the cliff. We don't really see cyclonic behavior in quantum mechanics, we only see what i like to call "the surface" in which the probabilities are distributed in the manner of the first example, where we see an interference pattern. The question now is why do we not see turbulence patterns in quantum mechanics? I can't put my finger on it, but both examples seem to have the same dimensionality, in which both patterns could be seen from any direction, with the exception that Fig2 dominates the surface, while fig 4 dominates the bulk. I didn't want to dive into speculation, but i feel like the metaphor here, is that one can think of a particle as dropping it into a bowl of probability. in this bowl, it has a certain wave function that determines it's locale and momenta. What we can only see is the result on the photographic plate, which is just the surface of that water. But "under the hood" is a sea of probabilities we can't see, one where the behavior is chaotic just like the cyclonic behavior. The follow up question here is, am i describing the complex field? [link] [comments]  |
| How do I understand what complex units like kg·m^2·s^−3·A^−1 mean? Posted: 19 Apr 2016 02:51 PM PDT Is there a logical way to approach understanding what units like this mean? For example, I intuitively understand that m·s-1 is the distance travelled per second. So I suppose my question is actually in two parts -
[link] [comments]  |
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