Perimeter residue

Detailed analysis of the perimeter residue often yields useful information, for example, whether the bullet is unjacketed or jacketed and the nature of the jacket material. Primer type may occasionally be inferred and the presence of strontium or magnesium indicates a tracer or incendiary bullet, respectively. 

While the excavation is open, the adequacy of leak repairs shall be checked by using acceptable methods. The perimeter of the leak area shall be checked. In the case of a Grade 1 leak repair as defined in para. GR-5.20.1, where there is residual hydrogen in the ground, a followup examination should be made as soon as practicable after allowing the soil atmosphere to vent and stabilize, but in no case later than 1 month following the repair. In the case of other leak repairs, the need for a followup examination should be determined by qualified personnel. 

TTie filtration station cap has pin holes around the perimeter to allow residual sample drops to be rinsed out of Gooch crucibles with water. 

The flagger was the only worker who did not have most of the residues on the hands. Instead, they were more evenly distributed over the body with the face having most of the exposure. For example, in experiment 4 (XLR) the HDE for the face was 381 mg/h when the total HDE was 606 mg/h and in experiment 5 (Sevimol-4) was 185 mg/h when the total HDE was 408 mg/h. For experiment 6 (Sevimol-4) the total HDE to this worker was 385 mg/h and the HDE for the face was 199 mg/h. These totals were higher than the 177 mg/hr total HDE for experiment 7 (80S). However, during experiments 4, 5, and 6 it was necessary for the flagger to be in the corn field, but during experiment 7 the flagger was on the perimeter of the field. 

The residue on the surface of a discharged bullet appears to originate from the base of the bullet itself, from the primer, and from inorganic additives to the propellant. Firings numbered 8,21,34, and 35 had lead-free primers yet lead was detected on the perimeter of the bullet holes. Ammunition with barium-free primers gave barium on the perimeter. 

Overall, the possibility of determining the bullet jacket material from the residue around the bullet hole does not appear to be feasible using FAAS. However, FAAS reliably detects elements associated with firearm discharge on the perimeter of the bullet hole and is a very useful method for confirming bullet damage. 

The residual solid filtered from the hypochlorite dissolving solution now contains less than 50 xg/g mercury. This is discarded by blending it with some inert diluent material such as sand and then burial. Disposal areas are sealed using plastic film or layers of impermeable clay for containment, and have a ring of drainage tile placed around the perimeter with provision for treatment... 

FIGURE 7-46 Schematic models of the pore-lining M2 helices in the closed and opened states. In the closed state, the kink in the center of each M2 helix points inward, constricting the passageway, whose perimeter is indicated by the blue spheres. In the open state, the kinks rotate to one side, so that the helices are farther apart. The green spheres denote the hydroxyl groups of serine (S) and threonine (T) residues in the center of the M2 helices in the open state these are parallel to the channel axis and allow ions to flow. [Adapted from N. Unwin, 1995, Nature 373 31]... 

The different effects of mutations on the native versus the promiscuous functions are particularly striking in view of the fact that many of these mutations are found within the active site, typically at the wall and perimeter. Structural and thermodynamic insights into the effects of these generalist mutations are needed before any definite statements could be made. Yet it seems probable that the plasticity of these residues lies in the fact that they are not part of the protein s scaffold, or of the catalytic machinery of the enzyme. The mutated residues are typically located on surface loops that exhibit high conformational flexibility and comprise the substrate binding part of the active As discussed in Section 8.03.6.3, there exist fundamental... 

---