In such cases, idealizing assumptions can be introduced to bring the relevant feature of the mechanism most clearly into view: infinite populations, frictionless planes, perfect geometrical shapes are presumed in order to strip the model of detail that does not matter for, or would only obstruct, the intended purposes of model.
However, a secondary grain population, whose basal planes are not parallel to the substrate, also exists (see Supporting Information Figure S9).
The series began in September, with a passenger on a flight to Boston injecting himself with what appeared to be insulin; the syringe actually contained a man-made virus that, within minutes, reduced the plane's population to zero.
However it was obviously able to better distinguish between GRMD dogs: at the age of 9 months for instance, all the GRMD dogs except Dbrouille were found very close to each other using the motor score, whereas a clear separation was identified using the distance from the healthy population on the PCA plane.
Subsequent high-resolution DTI of fixed myocardium, and histological sectioning, reconfirmed the existence of alternating sheet-plane populations.
In addition, it allows visualization of distances between populations on a plane [41], which many other classification methods do not.
Inference from these studies is limited, however, because they only estimate the amount of self-recruitment to a single location – not the amount of connectivity between populations (but see Planes et al. 2009; Christie et al. 2010).
Christaller's theory assumes that central places are distributed over a uniform plane of constant population density and purchasing power.
In Puerto Rico, the CDC has spent months begging Puerto Rican officials to control the mosquito population with pesticide sprayed from planes, and Frieden called local officials' failure to spray a question of "negligence".
Janet Culbertson takes an even bleaker view in her vignettes of so-called industrial gardens, where cooling towers and skyscrapers have replaced trees, highways snake across the landscape, the human population grows like weeds and planes instead of birds fly overhead.
