Fragment suppression

It was necessary to establish a methodology to predict secondary fragment hazards and fragment suppression characteristics of the composite structural steel walls of a suppressive shield (] ). 

BGAD Blue Grass Army Depot FSS fragment suppression system... 

The operating cycle begins when an unpacked chemical mrmition is placed in a fragment suppression system (ESS) consisting of two steel half-cylinders, one... 

FSS fragment suppression system POP persistent organic pollutants... 

The other fragmentation pathways are typical for diaryl sulfoxides1-4-6,1. A corresponding ortho effect was found in chlorodiphenyl ethers and sulfides but not in sulfones12 (12) were the sulfinate ester rearrangements1-4,6,11 and the consequent formation of the m/z 125 and m/z 159 ions suppress the other possible fragmentations of the molecular ions (equation 4). It is also noteworthy that the ratio [m/z 125] [m/z 159] increases with increasing distance between the chlorine and the sulfur (equation 4). 

Figure 9. Suppression of decomposition of excited CnHln + evidenced by the decrease of fragment ions Cz>H9 + and C7iT 3 + with...

Microscopic examination of the heart revealed edematous separation of myofibrils that had resulted in compression thinning and fragmentation of myofibres. Myofibre outlines were less distinct, and there was loss of acidophilic staining. Mitotic figures were rare, indicating that growth of the cardiac tissue was suppressed. The incidence of cardiac lesions is given (Table VI). 

The mechanism Implied by these expressions Is that of a submonolayer of surface carbon which blocks n sites for NH adsorption. This suppresses NH decomposition which would occur on the clean surface (Figure 3(a)) and allows NH fragments to react with carbon to form HCN. Selectlvltles of HCN production exceed 90% at 1 Torr, and reaction probabilities (fraction of CH flux yielding HCN) approach 0.01. 

Staurosporine, a kinase inhibitor, also suppressed PAL transcription and enzymatic activation, which indicates that the phosphorylation of still unknown (transcription) factors happened in response to stimulation by pectic fragments. However, another staurosporine-insensitive but salicylic acid responding pathway led to the transcription of pathogenesis related (PR) genes [26]. 

A triple-quadrupole mass spectrometer with an electrospray interface is recommended for achieving the best sensitivity and selectivity in the quantitative determination of sulfonylurea herbicides. Ion trap mass spectrometers may also be used, but reduced sensitivity may be observed, in addition to more severe matrix suppression due to the increased need for sample concentration or to the space charge effect. Also, we have observed that two parent to daughter transitions cannot be obtained for some of the sulfonylurea compounds when ion traps are used in the MS/MS mode. Most electrospray LC/MS and LC/MS/MS analyses of sulfonylureas have been done in the positive ion mode with acidic HPLC mobile phases. The formation of (M - - H)+ ions in solution and in the gas phase under these conditions is favorable, and fragmentation or formation of undesirable adducts can easily be minimized. Owing to the acid-base nature of these molecules, negative ionization can also be used, with the formation of (M - H) ions at mobile phase pH values of approximately 5-7, but the sensitivity is often reduced as compared with the positive ion mode. 

Tomato DNA Plant Technology/1994 A fragment of the gene encoding aminocyclopropanecarboxyUc acid synthase (ACCS) to suppress the endogenous ACCS enzyme Tomato Delayed ripening due to reduced ethylene synthesis... 

Tomato Zeneca/1994 A fragment of the polygalacturonase (PG) gene to suppress the endogenous PG enzyme Tomato Delayed softening due to reduced pectin degradation... 

Desorption/ionisation techniques such as LSIMS are quite practical, as they give abundant molecular ion signals and fragmentation for structural information. In the conditions of Jackson et al. [96], all the molecular ion and/or protonated molecule ion species were observed in the LSIMS spectrum when only 1 pmol of each additive was placed on the probe tip. However, as mentioned above, in LSIMS/MS experiments the choice of the matrix (e.g. NBA, m-nitrobenzylalcohol) is very important. Matrix effects can lead to suppression of the generation of molecular ions for some additives. LSIMS is not ideal for the quantitative detection of polymer additives, as matrix effects are very important [96]. 

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