Stabilization center

Dosztanyi, Z., Fiser, A. Simon, I. (1997). Stabilization centers in proteins identification, characterization and predictions. J Mol Biol 272,597-612. 

In BPDA-PDA, the only hydrolysis observed was of anhydride. If the samples are cured to at least 400 °C to minimize the residual anhydride, the bulk polymer should be quite stable to hydrolysis. In this material, then, the major remaining concerns about hydrolytic stability center on the polymer-substrate interfaces whether possible polymer-metal interactions could result in the formation of hydrolytically unstable products and whether or not agents used to promote adhesion will retain their efficacy under humid aging. 

In a review published in 2006, GSI nuclear chemist Matthias Schadel noted that until the early 1980s scientists expected an island of stability centered at Z = 114 and N = 184 which was surrounded by a sea of instability. He declared that current studies... 

Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KS, USA Macromolecule and Vaccine Stabilization Center, University of Kansas, Lawrence, KS, USA Department of Chemistry and R. N. Adams Institute for Bioanalytical Chemistry, University of Kansas, Lawrence, KS, USA... 

Department of Pharmaceutical Chemistry Macromolecule and Vaccine Stabilization Center... 

The F J centers can be associated with certain defects in the crystal lattice to form more stable color centers with output characteristics similar to the F J center. To date, four types of stabilized centers have been reported the (Fj)a, (FJ), (F+ p+. q2- centers. The (FJ)A center is an Fj... 

Figure 14 Typical variations of the interfacial tension (left), emulsion stability (center), and emulsion drop si/c (right), along a fonnulation scan. Case of nonionic system and temperature scan.

Theoretical physicists predicted the existence of the island of stability, centered at element 114 with mass number 298, in the 1960s. The term stability refers here to that of the atomic nucleus. An unstable nucleus tends to fall apart by radioactive decay—a piece spontaneously flies off the nucleus, leaving a different one behind. Approximately 275 nuclides are completely stable, or nonradioactive. All of these nuclides have atomic numbers (or numbers of protons) no greater than 83 (the atomic number for the element bismuth). Beyond bismuth, all elements are radioactive and become increasingly unstable. In fact, none of the original, primeval elements past uranium (element 92)—the transuranium elements—exists any longer they have long since vanished by radioactive decay. Scientists have made transuranium elements in the laboratory, however. 

Fig. 1 The calculated microscopic corrections to liquid-drop masses [24, 56-59] for the heavy elements, showing a prediction of the location of the Island of Stability, centered at Contours are labeled in MeV. The neutron-drip line is indicated, as are the pathways to the heavy elements followed by the stellar and thermonuclear r-ptoeesses. The compound nuclei produced in representative heavy-ion reactions are also shown, eonneeted to the target nuclide by a dotted line...

In spite of the lower excitation energies obtained in cold-fusion reactions, hot-fusion reactions produce evaporation residues that are more neutron rich, a consequence of the bend of the line of fi stability toward neutron excess. For the purposes of studying nuclei whose stability is more strongly influenced by the spherical 184-neutron shell clostrre, hot fusion is the more viable path. If nuclei were constrained to be spherical, or deformed into simple quadrupole shapes like those that influence the properties of the actinide isotopes with N — 152, one would expect cold-fusion reactions to quickly veer into ZJ space where nuclides would be characterized by very short partial half-lives for decay by spontaneous fission. In fact, there is a region of nuclear stability centered at Z = 108 and N — 162 [12, 19-21], removed from the line of fi stability toward proton excess, where the nuclei derive a resistance to spontaneous fission from a minor shell closure associated with complicated nuclear shapes, making a emission their most probable decay mode [133, 240]. 

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