Contiguous Stacking

MICROCHIP ANALYSIS OF DNA SEQUENCE BY CONTIGUOUS STACKING OF OLIGONUCLEOTIDES AND MASS SPECTROMETRY... 

Other CT scanners do not use a first-stage screener, but instead they continuously generate contiguous slice images of the bag as it moves at a constant speed through the system on the conveyor. The system s software stacks these slices, one next to the other, to form the 3D density image. The software then searches the entire 3D image for threat objects. 

In both rods and cones, the light-sensitive molecules reside in a layered system of membranes at one end of the cell (figs. S2.2 and S2.3). The membranes form by invaginations of the plasma membrane near the middle of the cell. In cone cells, the membranes remain contiguous with the plasma membrane. In rods, they pinch off to form a stack of autonomous flattened vesicles, or disks, in the outer segment of the cell. This region of the cell is connected by a thin cilium to the inner segment, which is packed with mitochondria and ribosomes. The basal part of the cell ends in a synaptic junction with another neural cell called a bipolar cell. 

The peptide cyclo [(D-Ala- L-Glu- D-Ala- L-Glu)2] with an even number of alternating d- and L-amino acids adopts a flat conformation. This macrocyclic synkinon forms extended stacks in water and vesicle membranes. A contiguous P-sheet in the form of tubules may reach a length of a few hundred nanometers and an inner diameter of about 7-8 A in water (Fig. 9.5.4). The tubules also condense to form bundles of about 100 parallel strands. In lipid bilayers these peptide nanotubes are aligned parallel to the hydrocarbon chain and act as ion channels at their rigid outer surfaces. Their regulation by molecular stoppers, applied potentials, etc. has not been achieved so far (Kim et al., 1998). 

---