In what ways is technology assisting you with your practice?
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Attitude of Health Personnel↗
Biomedical subjects
C Kovach
Publications and source records attributed to C Kovach.
Coherent light scattering by nanostructured collagen arrays in the caruncles of the malagasy asities (Eurylaimidae: aves)
We investigated the anatomy, nanostructure and biophysics of the structurally coloured facial caruncles of three species in a clade of birds endemic to Madagascar (Philepittinae, Eurylaimidae: Aves). Caruncle tissues of all species had reflectance spectra with prominent, peak hues between 403 and 528 nm. Dark blue Neodrepanis tissues had substantial reflectance in the near ultraviolet (320-400 nm), which is visible to birds but not to humans, providing the first evidence of ultraviolet skin colours in birds and the first indications of the possible function of ultraviolet skin colours in avian communication. These structural colours are produced by coherent scattering from arrays of parallel collagen fibres in the dermis. Tissues of Philepitta castanea were organized into hexagonal, crystal-like arrays, whereas Neodrepanis tissues were quasiordered. Predictions of the peak hues of reflectance ( &lgr; (max)) using Bragg's law were relatively accurate, but Bragg's law requires physical assumptions that are obviously violated by these structures. A two-dimensional discrete Fourier analysis of the spatial variation in refractive index within the tissues documented that all the tissues are substantially nanostructured at the appropriate spatial scale to scatter visible light coherently. Predicted reflectance spectra based on the two-dimensional Fourier power spectra are relatively accurate at predicting the hue and shape of the reflectance spectra of the tissues. These results confirm that the nanostructure of the collagen arrays determines the colours that are coherently scattered by these tissues. The evolution of the anatomy and nanostructure of asity caruncles is discussed.
Journal Article↗
What moral and/or ethical challenges do you face in your practice? What mechanisms, if any, are used to process or resolve specific problems?
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Aged↗
Reminiscence: exploring the origins, processes, and consequences.
Empirical investigation of reminiscence as a naturally occurring process and as a therapeutic nursing intervention has been hampered by the lack of a theoretical framework that can integrate diverse viewpoints and account for existing data. This article presents a preliminary model of reminiscence that can guide future research efforts and assist clinicians in understanding the functions of the reminiscence process. The model proposes that reminiscence is a source of self-referent knowledge, which influences a person's self-worth. It views reminiscence as a process of acquiring personal existential meaning and as a mechanism for adapting to stress.
Humans↗
The use of 99mtechnetium in the diagnosis of patent processus vaginalis.
We report 2 cases of scrotal swelling after placement of peritoneal catheters. 99mTechnetium intraperitoneal scanning was used to identify a patent processus vaginalis in each case. This simple, rapid, and nontoxic method can be used routinely to screen patients for a subclinical hernia before institution of intraperitoneal therapy.
Adult↗