Crystal- defect groups are cautioned that the approximations that successfully model single F- centers may fail for adjacent F- centers. Theorists have a new well-behaved system to test their methods. This is of interest to both the electronic structure theory and crystal- defect communities. Simulations of UV/visible absorption spectra qualitatively fail to reproduce experiment unless left-right correlation is taken into account. I show that adjacent F- center defects in lithium fluoride display symptoms of 'strong' left-right correlation, symptoms similar to those seen in stretched H2. This work explores how left-right correlation, a textbook problem in electronic structure theory, manifests in a textbook example of electrons trapped in crystal defects. Left-right correlation in coupled F- center defects. The results are consistent with the experimental observations. In addition, we present semiempirical calculations of the localized vibrational mode frequencies of the defect. As a continuation of this work, we further investigate structure and the formation of intermediate defects. In a recent paper we have tentatively attributed two new infrared bands at 914 cm - cm-1, in neutron-irradiated Czochralski-grown silicon, to a structure that was considered to develop as an intermediate stage in the process of conversion of a VO center to a VO2 complex upon heat treatment. Precursor defect to the vacancy-dioxygen center in Si The authors recommend doing immediate reconstruction when feasible.

The authors present a total of 37 patients with microsurgical reconstruction of a complex maxillectomy defect 13 patients had immediate and 24 had delayed reconstructions. In this article, the authors present their experience with immediate and delayed reconstruction of complex maxillectomy defects in a tertiary center in Mexico. Various factors have been identified as having influence in the outcome of microsurgical reconstruction. Microsurgical reconstruction of complex midfacial and maxillectomy defects is among the most challenging procedures in plastic surgery, and it often requires composite flaps to improve functional and aesthetic results.

Lessons Learned from Delayed Versus Immediate Microsurgical Reconstruction of Complex Maxillectomy and Midfacial Defects: Experience in a Tertiary Center in Mexico.

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