A basic amino acid, typically histidine, is essential for acting as a proton acceptor forming the anionic peroxide that binds to Fe(III).
It plays an essential role, acting, as for eukaryotic mRNAs, to initiate the process of translation and to protect the viral RNA from degradation by endogenous RNA exonucleases.
Colostrum, the milk produced by the mother just after delivery during the first post-partum days, provides protective antibodies and essential nutrients, acting as a first "natural" immunization for newborns, strengthening their immune system and reducing the chances of death in the neonatal period.
"If you want to stabilize CO2 emissions over a long period of time, we think carbon sequestration is essential," said Robert S. Kripowicz, acting assistant secretary of energy for fossil energy.
Plant neutral lipids such as seed oil triacylglycerols play a key role in many aspects of human life, ranging from providing essential nutrition to acting as biolubricants.
To me, Rand's philosophy celebrates reason, willpower, and this life as lived here on earth -- taking responsibility for one's health is essential thinking clearly, acting independently, and enjoying oneself fully.
The circular dichroism spectra of the D32A variant varied by only 3.6% at 220 nm confirming that an alanine replacement of the active site Asp does not affect the conformation significantly and therefore the mutation results only in the loss of an essential functional group acting as a base in the phosphate-transfer reaction.
However, disruption of p53-dependent apoptosis appears to be essential in lymphomagenesis, acting through overexpression of anti-apoptotic proteins including BCL2 and BCL-XL and surviving [ 58].
Bacterial IF1, as well as its cytoplasmic eukaryotic ortholog eIF1A are essential genes [28,29], acting as fidelity factors involved in initiator tRNA and start codon selection during the initiation complex assembly [30,31].
