Should this occur, the placenta becomes the main source of progesterone, without which the pregnancy would terminate.
Ice-loss from Antarctica becomes the main source of uncertainty after 2030, with a contribution reaching 50% by the end of the century.
Once a country's labour force stops growing and an increasing capital stock causes the return on new investment to decline, TFP becomes the main source of future economic growth.
In vitro, in somatic cells that have lost proliferation control, shortening of telomeres becomes the main source of genome instability leading to genetic or epigenetic changes that may allow cells to become immortal and to acquire tumor phenotypes.
— and they're not really meant to sleep more than six or seven hours, but they're in bed early trying, and they awaken early". Whatever the original cause, difficulty staying asleep often gives rise to worry over not getting enough sleep, and a vicious cycle develops in which this worry itself becomes the main source of insomnia.
PDFs and orientation distribution functions (ODFs) were reconstructed with different q-space filtering and PDF integration lengths, and from down-sampled data by factors of two and three.Both ex vivo and in vivo data showed Gibbs ringing in PDFs, which becomes the main source of artifact in the subsequently reconstructed ODFs.
