Up to 5,000 US servicemen presently live on the largest island, Diego Garcia, and have all their food, drink and essentials flown in.
Indeed, plumage maintenance is essential to fly and for bird's survival [29].
We find that EF-G1 is essential during fly development, but its function is not required in every tissue.
Flies homozygous mutant for any of the four Sans alleles were adult viable, male and female fertile, and had no gross morphological defects (data not shown), indicating that Sans is not essential for fly development and fertility.
Since the flies do various rotations during maneuver, certain amount of mismatch between the actuation and sensing frequency of the haltere is essential for fly's sensing mechanism.
Embryos lacking centrosomes arrest early in development after only a few rounds of nuclear division, and several key PCM proteins such as Cnn, Spd-2, Asl and TACC that are not essential for fly viability are essential for these early stages of embryo development (Dix and Raff, 2007; Gergely et al., 2000; Megraw et al., 1999; Varmark et al., 2007).
To our surprise, plp mut embryos developed and hatched at near normal rates (Fig. 3B), demonstrating that, unlike proteins such as Cnn, Spd-2, Asl and TACC (that are not essential for fly viability, but are essential for early embryo development), PLP is not essential for mitosis even during the very rapid nuclear divisions of the syncytial embryo.
It is not essential to fly or drive over 4 hours to break the news.
There were 77 passengers aboard United Flight 826, a Douglas DC-8 jetliner that, with a crew of seven, had wandered off course, apparently because of a problem with a navigational radio that was essential for flying in bad weather.
Aluminum is essential for flying machines like the F-35 joint strike fighter and Boeing F/A-18 Super Hornet, for armor plating on army vehicles and naval vessels and for countless infrastructure projects including bridges and roads.
