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Principal points

principal point

(Science: microscopy) Mutually conjugate points lying on the lens axis and producing a magnification of one. Object and image distance as well as focal length are calculated (measured) from these points.

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Re: Theories - Origin of Life

... McPhail 1994;Taylor & McPhail 1999). Consequently, they fulfill the principal criteria of biological species. It has been well argued that ecological ... Only stage 4 can be classified as a speciation event and the paper points to only one example It asks the question Why have these sympatric ...

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by scottie
Tue Mar 13, 2012 3:12 pm
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 563
Views: 1130388

Theories - Origin of Life

... - I like your signature. Thanks. I'm thinking of trying to convince my principal that this counts as "professional development." :P Since ... the ability of natural selection to produce new species. It simply points out that genetic variation is not unlimited. This fits with the common ...

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by Luxorien
Sat Mar 10, 2012 5:03 pm
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 563
Views: 1130388

Re: Brain size=IQ level theory (Blacks vs Whites & Asians)

... references to correlation, regression (including multiple regression), principal components analysis, and factor analysis, for failing to inform ... racial differences'. Although the White/Black IQ gap averages 15 points, the difference 'is more pronounced on subtests that are highly heritable ...

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by TJJ
Fri May 16, 2008 12:13 am
Forum: Human Biology
Topic: Brain size=IQ level theory (Blacks vs Whites & Asians)
Replies: 75
Views: 333110

The Fiber Disease

... of previous 'callus' formation), could you confirm where exactly the 'principal' callus started? This may have been in the back of the neck, perhaps ... as other callus type lesions embedding themselves in hooks at different points of the scalp. I think that the allergic reaction set off subcutaneously ...

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by Cilla
Thu Jul 20, 2006 7:10 pm
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 6250986

Bone remodelling

... have been compiled and analyzed by Frost (4.1.3,4.1.4). Salient points are as follows: 1. Remodelling is triggered not by principal stress but by 'flexure". 2. Repetitive dynamic loads on bone trigger remodelling; ...

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by Dr.Stein
Mon Nov 28, 2005 2:09 am
Forum: Physiology
Topic: Bone remodelling
Replies: 11
Views: 36288

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