Although not strictly active control, the magnitude and phase of the secondary tonal noise can be adjusted by varying the axial distance between the rotor and the obstruction, and the circumferential position of the obstruction, respectively.
Thus, the concepts of active and passive force closure arise: an external wrench can be counterbalanced if there exist strictly active or passive internal forces (Bicchi and Pratichizzo 2000).
This is interesting because both species of mosquitoes are vectors of disease, but may show different diel/circadian expression patterns owing to differences in temporal niche (An. gambiae is strictly night active and Ae. aegypti primarily day active), evolutionary lineage, and/or habitat [ 52, 53].
The strictly conserved active site residues, Asp29 and His34 (Supplementary Figure 5a), located in the active site housing segment (α1′−η1′−α2′) in ChsH1, are almost in identical positions with respect to the active sites in AcRH, CtRH and HuRH.
His, a strictly conserved active site residue, in conjunction with the powerful Lewis acid activating binuclear Zn2+ environment, is ideally positioned to acquire a proton from the bridging water to generate a potent nucleophilic hydroxide for attack at the carbonyl component of substrate.
It locates adjacent to the strictly conserved active site (red in Figure 6A), with a predominantly positive surface potential (blue in Figure 6B).
The potential problem, however, is that military regulations strictly forbid active-duty personnel who may be political candidates from engaging in anything campaign-related, even down to "behind-the-scenes activities".
In the present study, we investigated the effects of diurnal human disturbance associated with tourism on the reproductive performance of the European storm petrel Hydrobates pelagicus, a small seabird that nests in cavities and is strictly nocturnally-active at breeding colonies.
It is therefore not surprising that there are no active-site inhibitors that distinguish the complexes, as strictly speaking, the active site is identical in both.
The fact that, strictly speaking, the active state of a catalyst only exists during the catalysis further emphasizes the need for performing operando studies under relevant reaction conditions.
This underlines that special attention has to be paid to strictly adhere to active surveillance program.
