PMC

Red dotted lines indicate linear retouch on an edge, blue dashed lines indicate notching. Number is the artifact designation for analysis. Side based on dorsal view. a: Distal blade with abrupt dorsal truncation at proximal end, ventral right and left marginal retouch, and ventral notching on left and right. b: Distal blade fragment with impact fracture at distal end, abrupt dorsal truncation at proximal end, ventral right and left marginal retouch above notches, dorsal notch on left margin and ventral notch on right margins. c: Distal blade fragment with impact fracture at distal end, ventral marginal retouch on right margin, ventral marginal retouch above notch on left margin, dorsal notch on left margin, ventral notch on right margin. d. Distal blade fragment with impact fracture at distal end, ventral marginal retouch on right margin above notch, dorsal notch on left margin, ventral notch on right margin. e. Blade with twisted profile, bifacial retouch on both margins, bifacial notch on left margin, dorsal notch on right margin, notches flush with base. f. Twisted blade with dorsal notch on right margin, ventral notch on left margin, ventral retouch above notch on right margin. g. Twisted bladelet with dorsal notch on left margin, ventral notch on right margin, dorsal left marginal retouch, and ventral right marginal retouch. Note offset of point from long axis. h. Blade with left dorsal margin retouch, right margin ventral retouch restricted to the upper part of the blade, dorsal notch on right side, ventral notch on left side. i. Twisted bladelet with ventral notch on left margin, notch on left margin appears to be the unretouched morphology of the bladelet. j. Distal bladelet fragment with bifacial notch on right margin, ventral notch on left margin. k Bladelet with dorsal notches on left and right margins. l. Distal blade fragment with dorsal notch on both sides. m. Irregular distal blade fragment with bifacial notch on left margin, dorsal notch on right margin, bifacial marginal retouch above notch on left margin, and ventral retouch above notch on right margin. n. Blade with dorsal notch on right distal end and ventral notch on left distal end, ventral retouch above notch on both margins. The tip of this piece is not a point and the orientation is unusual with the notches at the distal end of the bladelet. o. Blade fragment with a series of four dorsal notches on left margin and two bifacial notches between two ventral notches on right margin.

Comparison of Ski8p with Gβ and Tup1c. (A) Superposition of Ski8p, Gβ, and Tup1c. Ski8p is shown in red, Gβ in blue, and Tup1c in green. The view of Ski8p is as in Figure 1A. (B) Same as A but with the view looking at the side of the propeller. (C) Superposition of all seven blades of Ski8p. The Cα backbone for each of the seven blades was aligned with respect to blade 1. Four strands of each blade are indicated by A, B, C, and D. Blade 1, green; blade 2, red; blade 3, yellow; blade 4, cyan; blade 5, blue; blade 6, maroon; blade 7, magenta. (D) Superposition of two typical blades, blade 1 (green) and blade 6 (maroon) containing the eponymous Trp–Asp motif. Four conserved residues, which are involved in the structural tetrad, are shown in stick models, and hydrogen bonds are indicated with dashed lines.

( a) Arrow (1) shows how the proximal DLT curve remains directed to the right side. ( b) Arrow (2) shows how the distal DLT curve follows the curve of the standard non-channeled blade (approximately 60–70°). ( c) Shows the bronchial tip of the DLT adapted to the tip of the standard non-channeled blade.

View of the video laryngoscope and modified blade and intubation with the video laryngoscope showing a side view of the laryngoscope with the blade attached, b the screen, c the tongue wrapped in moistened gauze and pulled toward the left side of the mouth with the left hand, and the laryngoscope blade inserted under the tongue through the right side of the mouth with the right hand. d The ET tube was inserted into the right side of the mouth. The epiglottis (*) and vocal folds (black arrow) were identified using the VL. The blade was inserted between the upper and lower incisors. e ET tube (white arrow) inserted through the vocal folds into the trachea