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Query: UMLS:C0851184 (thinning)
 11,252 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A new method of thin section preparation of III-V semiconductors and multilayers for transmission electron microscopy (TEM) is presented that exhibits considerable advantages over conventional methods such as ion beam milling and jet thinning. GaAs thin films and multilayers of GaAs/In chi Ga1-chi As/GaAs are grown over an etch release layer of AlAs on GaAs substrates by molecular beam epitaxy (MBE). Planar TEM sections prepared by selective etching from these samples show improved ability to image film morphology and dislocation arrangements, and the resulting large thin electron transparent areas facilitate dislocation density measurements and detection of spatial variations. Avoidance of radiation effects and wedge shaping, both common to ion milled samples, allows this method to be used to prepare uniform thickness standards of single layer GaAs films for EDS analysis or lattice imaging.
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PMID:Selective etching of AlAs for preparation of III-V semiconductor thin foils. 835 79

The experimental reproduction of an egg drop syndrome is described. Experimental oral infection of fowl with a haemagglutinating adenovirus resulted in the production of shell-less, soft-shelled and thin-shelled eggs in association with loss of egg shell colour and were similar to those changes seen in the egg drop syndrome 1976 (EDS 76). The first changes observed were 7 days post-inoculation when loss of egg shell pigmentation occurred. Colour patterns did not return to normal until 25 days post-inoculation. Thinning of egg shells was first seen 1 day after the loss of pigmentation and by 9 days post-inoculation soft-shelled and shell-less eggs were laid. From 13-16 days post-inoculation between 25 and 40% of eggs laid were either shell-less, soft-shelled or very thin-shelled. The majority of birds were laying normal eggs by 24 days post-inoculation. In spite of the marked egg shell changes the overall daily egg production remained at approximately 80% during the 17-week experimental period.
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PMID:Experimental reproduction of the egg drop syndrome 1976 with a haemagglutinating adenovirus. 1877 Apr 4

Solution-gelation chemistry has promising applications in forensic synthetic blood substitute development. This research offers a silicon-based sol-gel approach to creating stable materials that share similar rheological properties to that of whole human blood samples. Room temperature, high water content, silicon sol-gels were created using the organosilane precursors 3-glycidoxypropyltrimethoxysilane and tetraethylorthosilicate along with various concentrations of filler and pigment. Shear-thinning non-Newtonian properties were observed within most formulations of the presented materials. The effects of colloidal concentration, temperature, age and filler addition on the viscosity of the sol-gels were investigated. SEM-EDS analysis was used to identify the behavior of the fillers within the film and support their inclusion for basic bloodstain pattern simulation. A final proposed candidate sol-gel was assessed using a previously reported passive drip simulation test on a hard, dry surface and passed. This works represents encouraging development in providing safe material alternatives to using whole human blood for forensic training and research.
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PMID:The application of silicon sol-gel technology to forensic blood substitute development: Mimicking aspects of whole human blood rheology. 2788 43