Search found 119 matches

by skeptic
Thu Jun 23, 2011 9:39 am
Forum: Evolution
Topic: Where do we go from here?
Replies: 41
Views: 49639

Re: Where do we go from here?

Llama Bearing in mind that ethics prevent us carrying out breeding experiments on humans, correlation is about all the evidence you are likely to see. I agree that it is not 'proof' of anything. As I keep harping on, though, it matters not. Evolution is a slow process, taking thousands or tens of th...
by skeptic
Tue Jun 21, 2011 1:06 am
Forum: Microbiology
Topic: Anyone knows what organism is this?
Replies: 2
Views: 2110

Re: Anyone knows what organism is this?

Nice photos.

The second one is definitely a coelenterate of some kind. Perhaps the medusa stage of one.
by skeptic
Tue Jun 21, 2011 1:04 am
Forum: Microbiology
Topic: if cellulase microbes get loose
Replies: 2
Views: 1935

Re: if cellulase microbes get loose

This is one of the horror stories occasionally entered into by anti-GM activists. Sadly for them, the scenario has been tested. GM bacteria with enhanced cellulasic activity have been made, and proven in the laboratory. However, when exposed to 'natural' conditions, they tend to die out very quickly...
by skeptic
Wed Jun 08, 2011 11:13 pm
Forum: Evolution
Topic: ARE SEA TURTLES THE CURRENT DINOSAURS?
Replies: 3
Views: 4182

Re: ARE SEA TURTLES THE CURRENT DINOSAURS?

The first turtle-like reptile fossil is late Permian - well before the dinosaurs evolved.
by skeptic
Fri Jun 03, 2011 3:13 am
Forum: Evolution
Topic: What does it mean that dinosaurs ruled the earth?
Replies: 5
Views: 3563

Re: What does it mean that dinosaurs ruled the earth?

"Dinosaurs ruled the Earth" is absolutely and totally meaningless in any scientific sense. It is simply a catch phrase invented by the popular media to sell books and magazines.
by skeptic
Sun May 29, 2011 4:28 am
Forum: Microbiology
Topic: Developing resistance to detergent
Replies: 2
Views: 3380

Re: Developing resistance to detergent

There are a great many materials that bacteria cannot evolve a resistance to. Anything that has a gross effect is immune to resistance. For example : bacteria cannot evolve resistance to bleaches or to caustic materials since these chemically disintegrate the cell membrane. Nothing subtle there to g...
by skeptic
Sun May 29, 2011 4:23 am
Forum: Evolution
Topic: Debating Evolution
Replies: 7
Views: 7380

Re: Debating Evolution

This is horizontal gene transfer. m This is extremely common in prokaryotes - meaning bacteria. In higher organisms horizontal gene transfer is very rare, and can only happen via the action of a retrovirus affecting gametes. It is sufficiently rare that it has not significant effect on evolution, wh...
by skeptic
Sun May 29, 2011 4:16 am
Forum: Evolution
Topic: what causes the change in hair colour
Replies: 2
Views: 4056

Re: what causes the change in hair colour

Does not need to be a recent mutation. The genes for early greying of hair might have been floating about in the population for a very long time, but just come together (becoming homozygous) on rare occasions.
by skeptic
Sun May 29, 2011 4:13 am
Forum: Evolution
Topic: Eliminating Predation via Selective Breeding
Replies: 5
Views: 5274

Re: Eliminating Predation via Selective Breeding

It may be possible. I am not a fish breeder, but behavioural changes have been made in a few generations in other species. The example that comes to mind is the breeding of tameness into the silver fox.
http://en.wikipedia.org/wiki/Domesticated_silver_fox
by skeptic
Thu Apr 14, 2011 5:22 am
Forum: Microbiology
Topic: Is Spirulina really good for our health ?
Replies: 38
Views: 181379

Re: Is Spirulina really good for our health ?

When you want to know if a claimed health aid is actually backed by science, the best web site to visit is m On spirulina, go to : m While spirulina appears to be a pretty safe material, quckwatch also reports that many of the health claims made for it have been tested and prove to be pure bunkum. R...
by skeptic
Mon Apr 04, 2011 8:16 pm
Forum: Evolution
Topic: Blind faith
Replies: 37
Views: 38579

Re: Blind faith

Zenithar

In many cases you are right.
The situations where it is OK to tentatively believe what other scientists have done, is when they have published in reputable and peer reviewed journals. Even there, allow for errors.
by skeptic
Sun Apr 03, 2011 3:58 am
Forum: Human Biology
Topic: Human Inferiority
Replies: 20
Views: 17140

Re: Human Inferiority

Human population is currently 7 billion and is expected to reach 9 billion by 2050. After that, projections suggest it will stabilise or fall. So any added impact from increasing population will be small. You quote 27,000 species per year going extinct. That is supposition. No-one actually knows. Th...