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About druS

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  • Birthday 05/19/1962

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  • Location
    Brisbane Australia
  • Interests
    Science - Inspired by Sean Carrol to attempt to learn the math behind Quantum, and picking up a life long love of biology at the same time.

    Rugby (Union), 4WD
  • College Major/Degree
    Bachelor Building
  • Favorite Area of Science
  • Occupation
    Technical Services (Construction and Engineering)

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  1. Defining "life" gets interesting and does not have much consensus. Ability to reproduce/heritable information Metabolism/Homeostasis (organisms can maintain themselves) It is generally considered that cells are the fundamental building block of life. While "life" is not well defined you will find that there is pretty strong agreement on the items you mention: virus are not life forms "seeds" are gametes - a step in the reproduction of certain life forms. Prions are proteins, not life (though proteins are a good example of emergence in the world if life forms) On the whole biology (life) emerges from chemistry but chemicals are not life. Molecules are not really "destroyed" but the can be transformed into other molecules. Atoms are not life and on-the-whole are not destroyed (physicists will provide plenty of corrections to that statement). Interestingly the atoms in your body largely have been around for billions of years and started as star dust. The origin of matter and atoms themselves, is another fascinating topic. You might enjoy this - a podcast by a well known Physicist interviewing a biologist and talking about "what is life?" https://www.preposterousuniverse.com/podcast/2020/01/13/79-sara-imari-walker-on-information-and-the-origin-of-life/ In an attempt to not break rules, the podcast takes a broader view on the definition of life, considers software/IT and looks to how life might appear beyond earth.
  2. How does one large fan compare to many smaller? Other things being equal the single larger fan will be more energy efficient. But other things are never equal and the centralisation of the duct sytsem will come with more resistant. One thing being missed is static v volume (in the fan selection). So those :"smaller" fans will still have the same static and aren't really smaller at all in the one metric that dictates sizze of motor/power etc. Another thing - ducts can't really be pushed at more than 10m/s, for many reasons. Most designers will work to around 6m/s if they can get away with it. A lot of what is proposed here is impracticable.
  3. Thanks Swansont, it was what i thought I was looking for but turns out you knew better than me. Appreciated. Dru
  4. No doubt at all. Two different things though. The medical advice should be the medical advice. Period. Policy setting should hefor ed that advice but dictate a response that balances things with general matters. In this case those include: 1. the country can't allow students to miss a year of schooling 2. closing schools would have a dramatic impact on health workers who rely on support from the schooling system in order to do their job. 3. drastic measures on the economy have their own impact which will also ultimately impact health of the public as poverty increases. So I can understand a desire by those responsible for the policy settings to keep schools open if it can be justified. But none of that should allow medical advice to be anything other than medical advice. And before we get too down the track of a presumption of political meddling in medical advice, Australia is doing relatively well on a global scale. Our current growth rate is 0.83 and has been below 1 for about two weeks. Our hospitals are about to be permitted to return to elective surgery (important to me as my wife treatment for a brain tumour has been halted) - this because, at this stage, our health system is not a risk of being overwhelmed.
  5. Hopefully during this period of isolation for many of us, someone can find time to check this. Some introductory remarks, this is a maths subject not physics and they really don't care about units but they do care that you simplify the answer as an accurate expression before approximating with the calculator. I have struggled with the differentiation so would appreciate thoughts there. This is just the first part at this stage. QUESTION: The ideal gas law relates the temperature, pressure and volume of an ideal gas. For n moles of gas the pressure P, volume V, and temperature T are related by the equation: PV = nRT Where n is the ideal gas constant. If pressure is measured in kilopascals (kPa), volume in litres (L) and temperature in degrees kelvin (K) then R = 8.3145 kPaL/Kmol. a) Suppose that one mole of ideal gas is held in a closed container with a volume of 25 litres. If the temperature of the gas is increased at a rate of 3.5 kelvin/min, how quickly will the pressure increase? b) Suppose that the temperature of one mole of gas is held fixed at 300K, while the volume decreases at a rate of 2.0 litres/min. How quickly is the pressure of the gas increassing at the instant that the volume is 20 litres? Thanks in advance. Edit: updated with proposed answers to both parts of the Q.
  6. This seems inconsistent with the advice from the Chief Medical Officer in Australia. The view is that the risk of transmission in schools is low and that teachers greatest risk is from other teachers, that parents greatest risk is exposure to other parents during drop off. I understand that schools are a something of a petri dish for many virus, but the view here seems to be that this virus is different.
  7. Presuming that the advice here in Australia is reasonably agreed, we are told that children are relatively minor risk of catching or transmitting SARS-Co2. And of course when they get it are minor risk of severe symptoms. One possible strategy could be to intentionally allow infection on those age brackets. It would help lead toward herd immunity. Now ethically let alone politically I doubt it would be permitted anywhere. HOWEVER - is some form of vaccine that was more aggressive possible for those low risk age groups? Would this assist quicker development of a vaccine. Then for the at risk groups a different more subtle, more tested vaccine be sought in the fullness of time?
  8. On Australia there have been some interesting initiatives to help fill the hand sanitiser gell. One boutique distiller (Archie Rose) has swappedx to ethanol and geared up to produce sanitiser. Similar scenario in some of the grape/wine areas where grapes have been tainted by smoke form the fires and are not usable for producing wine. They are interesting feel good stories, ut to be frank, I still cant obtain any hand sanitiser when I shop.
  9. I have arachnaphobia sufficiently advanced that I have to take time to still my pulse. Pretty sure this started at 4 or 5 years old with my grandfather cutting dead leaves/branches off banana trees. A huge Huntsmen (large friendly harmless useful spider, large being easy 8 inches across) leap from a cut branch onto my head. More recently coming face to face with a funnel web (about the size of the first joint on your thumb and VERY venomous) and this was NOT amuzing. Snakes are a different matter. I was introduced young to very poisonous snakes - first recollection is catching a death adder (venomous stubby fat 2 foot long maybe) , but also the common brown (6 foot, skinny, fast, way aggressive, leave alone). I like snakes. I got a little agitated when my wife nearly walked on top of a red belly black (these guys eat browns) in a state forest a couple of years ago, but as long as we avoided it once seen all good. Get the camera out.
  10. CharonY you continue to fascinate on this thread. Should have started talking about virus a long time ago! Is this "unrecognised domain" part of what I have seen described as "phylum candidate radiata"? By the way, don't plasmids self replicate? That would be a big difference to a virus I suspect. I will have to look up transposons.
  11. Love it Dagl1 - your response tells me I must keep studying! [But also gives me some specifics I want to test as I go forward.] (FWIW I would have thought identical DNA means a clone, I dont think that was the intent of the OP.)
  12. Dagl1, you seem to be reacting in a manner that suggests I am being aggressive against your input? Sorry mate if you think that, but it's not the case. Can I be offered a genuine interest? I would have completely stood by your statement over genomes. Certainly within my understanding of diploid organisms. I put out a query based on ignorance and interest. Let's focus on one single statement from wiki that I quoted In some species, ploidy varies between individuals of the same species. How does this effect genome? Genuine question, no challenge here.
  13. When I first glanced through this thread I scoffed. Misunderstanding about the meaning of genome. But I've been thinking about ploidy and wondering if my response is more about the genomes and chromosome systems that I am most familiar with. From Wiki on ploidy: Many animals are uniformly diploid, though polyploidy is common in invertebrates, reptiles, and amphibians. In some species, ploidy varies between individuals of the same species (as in the social insects), and in others entire tissues and organ systems may be polyploid despite the rest of the body being diploid (as in the mammalian liver). For many organisms, especially plants and fungi, changes in ploidy level between generations are major drivers of speciation. Does this put some reality back in the OP? Thanks in advance.
  14. So the coating is the protein capsid? (In an earlier post of mine there was a spell correct that changed the word). In west and south coast Aus, the weather is drier and less humidity. On the east coast and the north it is the opposite - but we still get seasonal flu. Either way we can only expect approaching winter to impact while approaching su8mmer in the northern hemisphere hopefully gains benefits. Fascinating what we do and don't know. Zapatos - from what we are hearing the symptoms could be symptoms of many many things of which only one is CV-19. FWIW some statistics in NSW Australia - reference: https://www.health.nsw.gov.au/news/Pages/20200316_02.aspx Total number of tests: 26 964 Tested and excluded: 25 511 Under investigation: 1 282 Confirmed positive: 171 Every country will have a different experience based on how accurate they are with who gets tested, and where they are on the curve. But as above under 1% confirmed approx 95% excluded.
  15. Understand the strategy. What I am not seeing is the social reality here in Australia, and i suspect that Australia has handled the matter better than many countries. There is an expectation that Summer will see a seasonal die-back in transmission, but here in Australia ALL of CV-19 cases have been contracted in Summer (or the summer shoulder). See rather than a natural die-back we would anticipate an increase in transmission. Currently a lot of thinking is short term eg the recent border closure (term used for convenience, you can enter but must voluntarily isolate for two weeks on arrival) and people are saying "just give it a couple of weeks to settle so we can understand what we are dealing with". But we should know that while a vaccine can be expected it will be 12 to 18 months. On the shorter scale it means availability of vaccine in the approaching winter of 2021, or on the longer scale deep into that winter. In the mean time we seem to be saying that slowing CV-19 down requires quite anti-social measures on more than a short term basis. CharonY, are you up to expanding on this a little? For background I have just completed my first biology unit in a science degree where one module was molecular biology. Enough knowledge to pretend to be dangerous lol. From recollection, a virus is a small chain of either single or double strand DNA or RNA. Am I correct in reading CV-19 as single strand DNA? The Virus has a consisting created by proteins (I had thought a single species but apparently not). And possibly some borrowed membrane from the host cell. Where does it pick up the polymerase?
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