Spiral stairs

Helical Chirality. Helicity is a special case of chirality in which molecules are shaped as a right- or left-handed spiral like a screw or spiral stairs. The configurations are designed M and P, respectively, according to the helical direction. Viewed from the top of the axis, a clockwise helix is defined as P, whereas a counterclockwise orientation is defined as M. Thus, the configuration of example 9 is defined as M. 

Returning up the solar spiral stairs, you enter the Chamber of Indwelling and divest yourself of the indigo robe. As you place the robe upon its stand, you see that, upon the breast (over the heart, when worn) there has appeared a small gold Latin cross with a ruby at its center. 

Imagine, on the other hand, the same spiral stair to be constructed with irregular tetrahedra for steps. Destroy the stair and the asymmetry wiU still exist, since it is a question of a collection of tetrahedra. Th may occupy any positions whatsoever, yet each of them will nonetheless have an asymmetry of its own. Such are the organic substances in which all the molecules have an asymmetry of their own, betraying itself in the form of the crystal. When the crystal is destroyed by solution, there results a liquid active towards... 

She tightened her grip on Genevieve s hand and hurried down the spiral stairs. At least Genevieve s limbs were working. Though what would happen if they met another of those... people-creatures was another question altogether. 

An iron spiral stair led up to the promenade deck. Al and Jezzibella settled back on a plump couch of green leather where they could see out of the long curving windows and along the rocket s nose cone. He put his fedora down on a cane table at the side of the couch and draped an arm around her shoulders. Prince of the city again, full-time. 

Spiral stairs should not generally be used. Winding stairs can be installed on tanks and similar round structures where the diameter of the structure is not less than about 2.5 meters. The stair should ascend in a clockwise direction to allow the stair rail to be on the right-hand side during descent. A stair rail between the tank and stairs is required if the gap between the tank/tank insulation and stairs is greater than 6 inches (CAL OSHA specifies 8 inches). Intermediate landings are not required. 

Go through the left-hand doorway, beneath the sun-cup symbol. This spiral stairway ascends in a deosil (clockwise) direction. You can feel a warm, dry breeze blowing up this stairway—blowing up behind you, not unpleasantly. It plays with your hair and the folds of your robe as you ascend. While climbing the stairs, you can see other doors and landings, but these do not concern you in the present practice. 

Make your way down the spiral stairway with the blue cord. As you step down onto the stairs, you are met by a cool, moist breeze blowing upward from the stairwell. This breeze gently blows on your face as you descend back down to the landing and emerge from the doorway sur-... 

Facing the depiction of the High Priestess, enter the left-hand spiral stairway. Feel the warm breeze blowing from behind and below hold onto the red handrail if need be, and walk up the clockwise spiral of stairs until you come to stand before the crystal door to the Turret Room. 

Going to the solar spiral stairway, ascend the stairs, feeling the dry, warm breeze blowing up behind you. Walk up the entire stairway, back to the landing of Da ath. From there, enter the Turret Room and, after pulling the purple cord, walk up the golden stairs and onto the battlements. Go to stand upon the window inset into the floor of the battlements. You... 

Stairs Standards specify various characteristics of stairs. Included are clear width, tread and riser dimensions, head room, distance between landings, and landing dimensions. There are also winder, spiral and curved stair specifications. There are other details about stairs including handrails, guardrails, stairs enclosures, and other features. 

Fixed stairways mnst be provided for access from one structure to another where operations necessitate regnlar travel between levels and for access to operating platforms at any equipment that requires attention routinely during operations. Fixed stairs must also be provided where access to an elevation is daily, or at each shift where such work may expose employees to harmful substances or for purposes for which carrying of tools or equipment by hand is normally required. Spiral stairways are not permitted, except for special limited usage and secondary access situations where it is not practical to provide a conventional stairway. 

DNA Deoxyribonucleic acid the genetic material of cells, containing nucleotides with deoxyribose sugar, phosphate, and the four bases adenine, thymine, guanine, and cytosine, double helix The hehcal shape of the donhle chain of DNA that is like a spiral staircase with a sugar-phosphate hackhone on the outside and base pairs like stair steps on the inside, frameshift mutation A mutation that inserts or deletes a hase in a DNA sequence. 

Ladders, and temporary, movable, spiral, or articulated stairs will usually be considered a limited or restricted means of egress. Fixed industrial stairs that meet OSHA standards will be considered a limited or restricted means of egress when the conditions or physical characteristics of the space, in light of the hazards present in it, would interfere with the entrant s abihty to exit or be rescued in a hazardous situation. 

The dimensions and parameters described above for doublehelix DNA are associated with one particular polymorph or conformation of DNA known as B-DNA. In this form, one turn, or repeat of the helix contains ten base pairs, and the length of that turn is 34 A (Fig. 7.16). To define a helical repeat, we can use the spiral staircase analogy again if you stand on the bottom stair (base pair) and climb upwards until you reach the stair that is directly above the starting position, you have moved through one helical repeat, having climbed ten base pairs. B-DNA is the most common... 

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