New species have often been essential, useful or at least harmless.
We, as a society, have abandoned the notion that sleep is essential and useful.
Power Doppler sonography is not necessary for every case in routine clinical practice, but is essential and useful in patients where grey-scale sonography is equivocal.
Prompt diagnosis and treatment is essential if useful vision is to be preserved and therefore ophthalmologists, physicians, and microbiologists need to have a high level of awareness of this disease to reduce harm to our patients.
The fraction of metabolisms of a given size in which a reaction is essential is a useful quantifier of the reaction's essentiality, which we have called the reaction's superessentiality index [ 13].
From an organisational perspective, clinical preparation is essential and a useful strategy to engage clinicians is the use of a simulation exercise prior to study implementation.
Understanding and correcting ascertainment bias is essential for a useful quantitative assessment of the landscape of LD across the human genome.
This gap is unfortunate, for knowing what constitutes a just incident reporting process in the eyes of front-line health professionals is essential for designing useful information systems to detect, monitor, and correct safety problems.
This includes a discussion on the potential effect of the gastrointestinal physiology on the ability to attain and maintain supersaturation as this information is essential in designing useful formulations based on the supersaturating concept.
Selection of informative SNPs across species and subpopulations during chip design is essential to obtain useful polymorphism rates for target germplasm groups.
