During late pollen development, tapetal degeneration triggered by an apoptosis-like process is essential for viable pollen formation (Li et al. 2006).
As thrombus formation is most likely augmented by the lack of endothelial cell coverage at the exposed stented site, an improved stent surface that enhances cell coverage is essential for viable polymer-less all metal stents.
We note that a reaction that is super-essential in any one environment must be essential for every viable genotype.
We note that a super-essential reaction will necessarily be essential for every viable genotype in this environment.
The ability of jai1-1 pollen to induce normal seed set when crossed to a wild type pistillate flower indicates that JA perception and downstream signaling events might not be essential for the production of viable pollen in tomato [ 23].
As both Dsnx1 and Dsnx6 mutants are viable, they may not be essential for Wg secretion.
Surprisingly, this strain was fully viable, suggesting that the dissociation of Dre2 from Tah18 in wild-type cells might not be essential for viability.
The suitability of the overall lithographic process for the ultimate pattern transfer step is essential for a viable lithographic process.
Moreover, the possibility to track lipid production in real time is highly desirable to support the initial screening of strains and media as well as to optimize the scaling up experiments, which are essential for a viable and successful development of an industrial production process.
As small differences in the magnitude of flooding can be extremely important, it is also possible that more than one strategy or multiple reproductive strategies are essential for maintenance of viable plant populations.
