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Search found 536 matches

by Peez
Tue Nov 28, 2017 9:52 pm
Forum: Life, the Universe, & Everything
Topic: "Kill the winner" makes biodiversity
Replies: 4
Views: 995

[quote=""lpetrich""]That experiment and its results have been much-discussed. I've found: Robert Treat Paine (1933–2016) | Nature 14 Experimental Ecology Revisiting Paine's 1966 Sea Star Removal Experiment, the Most-Cited Empirical Article in the American Naturalist. - PubMed - N...
by Peez
Mon Nov 27, 2017 5:03 pm
Forum: Life, the Universe, & Everything
Topic: "Kill the winner" makes biodiversity
Replies: 4
Views: 995

Image
by Peez
Wed Nov 22, 2017 4:19 pm
Forum: Life, the Universe, & Everything
Topic: Eukaryote Missing Link?
Replies: 7
Views: 977

This is awesome!

Peez
by Peez
Fri Nov 17, 2017 8:47 pm
Forum: Life, the Universe, & Everything
Topic: Sex-Determination Mechanisms
Replies: 14
Views: 1493

[quote=""lpetrich""]I found some stuff on "oedipal mating" and "oedipal reproduction": Oedipal Mating as a Factor in Sex Allocation in Haplodiploids on JSTOR Survival and Reproductive Strategies in Two-Spotted Spider Mites: Demographic Analysis of Arrhenotokou...
by Peez
Fri Nov 17, 2017 3:09 pm
Forum: Life, the Universe, & Everything
Topic: Sex-Determination Mechanisms
Replies: 14
Views: 1493

[quote=""lpetrich""]Stephen Jay Gould wrote "Quick Lives and Quirky Changes", collected in "Hen's Teeth and Horse's Toes", about an odd lifestyle that gives a clue to the origin of haplodiploidy. Histiostoma murchiei mites parasitize earthworm egg cocoons, an...
by Peez
Tue Nov 14, 2017 9:29 pm
Forum: Life, the Universe, & Everything
Topic: It Blew MY Brain
Replies: 2
Views: 863

Yes, this reminds me of a quote: ...Which brings me to the Hubble Space Telescope's newest images. If it's wonder that you're looking for, and mystery, don't just scan the photographs. Stop and think about them. Try to imagine the scale. The Earth is just a speck of dust on one distant whirling tent...
by Peez
Tue Nov 14, 2017 4:04 pm
Forum: Life, the Universe, & Everything
Topic: Sex-Determination Mechanisms
Replies: 14
Views: 1493

[quote=""lpetrich""] Note that, strictly speaking, typical flowering plants are not hermaphrodites. The familiar life history stage of a typical flowering plant is a sporophyte , it produces spores rather than gametes. These spores may grow into the gamete-producing stage, the ga...
by Peez
Mon Nov 13, 2017 2:54 pm
Forum: Life, the Universe, & Everything
Topic: Sex-Determination Mechanisms
Replies: 14
Views: 1493

lpetrich: Some organisms are simultaneous hermaphrodites, having both sexes of reproductive organs. That's very common in flowering plants, gastropods, and earthworms... Mosses and liverworts have different sexes only in their haploid phases... Very cool topic, I love explaining to students how man...
by Peez
Thu Nov 09, 2017 7:51 pm
Forum: Life, the Universe, & Everything
Topic: Was the Earth Once Purple?
Replies: 18
Views: 1754

[quote=""Jobar""]Re metals, I was wondering if a living organism could even theoretically 'grow' its own photovoltaic cell, and thus outperform all other photosynthesizing life. I understand that most (all?) of the iron ore bodies on Earth are the result of microorganisms concent...
by Peez
Mon Oct 30, 2017 6:44 pm
Forum: Life, the Universe, & Everything
Topic: Was the Earth Once Purple?
Replies: 18
Views: 1754

There must be a woprld out there somewhere, on which shirts like this would be good camouflage:

Image
by Peez
Mon Oct 23, 2017 7:27 pm
Forum: Life, the Universe, & Everything
Topic: The Last Universal Common Ancestor
Replies: 10
Views: 1471

lpetrich: Origin and evolution of the genetic code: The universal enigma[/url] by Eugene V. Koonin, Artem S. Novozhilov. The genetic code is the translation table for nucleotides to amino acids, thus translating RNA sequences into protein sequences. Nice summary. It is worth emphasizing that the sa...
by Peez
Tue Oct 03, 2017 9:45 pm
Forum: Life, the Universe, & Everything
Topic: Fermi’s Happiness Box
Replies: 4
Views: 1018

Image
by Peez
Tue Sep 26, 2017 5:15 pm
Forum: Life, the Universe, & Everything
Topic: Extinction and Size
Replies: 24
Views: 2595

Copernicus My thinking was in terms of population sizes. That is, there were more large animals in past epocs than there are presently, when the Earth is cooler and less able to supply as much energy to sustain large populations. That is conceivable, but there does not seem to be evidence that it h...
by Peez
Mon Sep 25, 2017 2:51 pm
Forum: Life, the Universe, & Everything
Topic: Extinction and Size
Replies: 24
Views: 2595

lpetrich: It is not clear why theropods could grow so large. That's much larger than most Cenozoic land predators. Present-day lions, tigers, and grizzly bears have shoulder heights of around a meter or a little more. So they'd look like puddycats and nice doggies compared to T. rex and similar-siz...
by Peez
Mon Sep 25, 2017 2:40 pm
Forum: Life, the Universe, & Everything
Topic: Extinction and Size
Replies: 24
Views: 2595

MattShizzle: I seem to remember reading the average dinosaur wasn't very big at all. I suspect that this is the case, though I cannot provide any actual estimates (such estimates would depend on relative numbers of individuals which would be hard to guess at, unless we were taking an average by spe...
by Peez
Mon Sep 25, 2017 1:23 pm
Forum: Life, the Universe, & Everything
Topic: Extinction and Size
Replies: 24
Views: 2595

Whether or not dinosaurs should be considered "reptiles" is a matter of semantics: how do we define a reptile? Certainly the evidence indicates that crocodiles are more closely related to dinosaurs than to lizards and snakes, so if dinosaurs are not considered reptiles then reptiles are po...
by Peez
Mon Sep 25, 2017 1:14 pm
Forum: Life, the Universe, & Everything
Topic: Extinction and Size
Replies: 24
Views: 2595

Copernicus Maybe that is true about, say, the blue whale, but that is about individual animals. In the OP, I mentioned "average size". In that case, you would have to take into account all of the animals that we have discovered in the fossil record and the size of their populations. My th...
by Peez
Sun Sep 24, 2017 11:47 am
Forum: Life, the Universe, & Everything
Topic: Extinction and Size
Replies: 24
Views: 2595

Copernicus My impression is that the average size of animals has declined over time... I lot of people seem to have this impression, but I don't believe that this is the case. We tend to focus on dinosaurs, some of which were certainly bigger than any land animal alive today, but we tend to ignore ...
by Peez
Sun Sep 03, 2017 6:02 pm
Forum: Life, the Universe, & Everything
Topic: Sperm Whales Stealing Fish Catches in Alaska
Replies: 8
Views: 1642

[quote=""Sey""]I'm skeptical. A sperm whale's mouth doesn't seem suited to grasping and eating individual fish, especially smaller ones.[/quote]To say nothing of biting them off from the head. Their dentition does not seem well-suited to this: https://i.pinimg.com/originals/35/1a...
by Peez
Fri Aug 18, 2017 6:57 pm
Forum: Creation & Alternative Science
Topic: "Alternative Cancer Therapy" Doubles Risk of Death
Replies: 3
Views: 1289

Interesting to note that they found higher average woo use in those with "higher socioeconomic status" and "Intermountain West or Pacific location".

Peez
by Peez
Thu Aug 10, 2017 6:56 pm
Forum: Life, the Universe, & Everything
Topic: Too cold to too hot? Is the Earth unusual in being just right for us?
Replies: 14
Views: 1851

[quote=""Rie""]That's quite a silly comment as we don't even know when we started. Maybe it does go in circles? Maybe there is something in synchronicity etc.[/quote]I am not even sure who that is responding to, it does not make a lot of sense to me.

Peez
by Peez
Thu Aug 03, 2017 3:51 pm
Forum: Life, the Universe, & Everything
Topic: Microbes grown on electricity (split from "Too cold to too hot?")
Replies: 2
Views: 664

The protein’s greatest selling point is in its ingredients.

Sunlight. And carbon dioxide.
No, just no.

Peez
by Peez
Wed Jul 19, 2017 1:57 pm
Forum: Life, the Universe, & Everything
Topic: Frostbite protection can cause arthritis
Replies: 2
Views: 641

[quote=""lpetrich""] The mutation that helped ancient humans survive frostbite probably gave us arthritis - ScienceAlert noting In northern humans, evolution favored shorter bones — but with a painful trade-off | News Center | Stanford Medicine When the researchers analyzed the s...
by Peez
Wed Jul 19, 2017 1:53 pm
Forum: Life, the Universe, & Everything
Topic: Why Rockets Need Stages
Replies: 13
Views: 1106

[quote=""Jobar""]Well, I wouldn't care to bet big bucks that the EM drive is all that it seems to be. However, I do place considerable trust in the skepticism and technical savvy of NASA scientists who have been testing the thing, and say that it apparently *does* work, producing...
by Peez
Tue Jul 18, 2017 7:04 pm
Forum: Life, the Universe, & Everything
Topic: Why Rockets Need Stages
Replies: 13
Views: 1106

Simply put, the EmDrive is a conundrum. Reactionless drives are named as such because they lack the “reaction” defined in Newton’s third law: “For every action there is an equal and opposite reaction.” But this goes against our current fundamental understanding of physics: An action (propulsion of ...