Purpose: To describe the clinical characteristics of multilayered optic disc hemorrhages, which are defined as subretinal, superficial retinal, and subhyaloid or vitreous hemorrhages in adolescents.
Methods: Case records of adolescents with acute multilayered optic disc hemorrhages were identified and evaluated retrospectively from 1994 to 2012. The appearance of the hemorrhages including the size, location, extension, and disc anatomy was recorded. Fluorescein angiography, visual field examination, and spectral-domain optical coherence tomography were performed in select cases.
Results: Nine boys and 7 girls were included, with a mean age of 15.0 ± 2.6 years. No precipitating factor, such as involuntary Valsalva maneuver, was identified in the majority of patients (93.75%). All eyes were myopic with an average refraction of -4.64 ± 1.88 diopters. Fifteen (93.75%) of the affected optic discs were crowded and tilted with small cups. Peripapillary subretinal hemorrhages were all crescent in shape and located at the nasal disc. Eight (50%) eyes had marked subretinal blood extension exceeding 1 disc diameter away from the disc edge. Superficial flame hemorrhages were predominantly located in the superotemporal part of the disc. Spectral-domain optical coherence tomography of the disc showed vitreopapillary traction and obvious subretinal hemorrhage with increased thickness. All multilayered optic disc hemorrhages resolved spontaneously.
Conclusions: Multilayered optic disc hemorrhages in adolescents more commonly affect myopic eyes with crowded and tilted discs. The visual outcome is excellent.
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http://dx.doi.org/10.3928/01913913-20140715-01 | DOI Listing |
Nano Lett
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National Laboratory of Solid-State Microstructures, School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, Jiangsu, China.
Strain solitons have been widely observed in van der Waals materials and their heterostructures. They can manifest as one-dimensional (1D) wires and quasi-two-dimensional (2D) networks. However, their coexistence within the same region has rarely been observed, and their interplay remains unexplored.
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School of Biomedical Engineering, The University of Sydney, Darlington, NSW 2008, Australia.
Thrombosis, a major cause of morbidity and mortality worldwide, presents a complex challenge in cardiovascular medicine due to the intricacy of clotting mechanisms in living organisms. Traditional research approaches, including clinical studies and animal models, often yield conflicting results due to the inability to control variables in these complex systems, highlighting the need for more precise investigative tools. This review explores the evolution of thrombosis models, from conventional polydimethylsiloxane (PDMS)-based microfluidic devices to advanced hydrogel-based systems and cutting-edge 3D bioprinted vascular constructs.
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Inner Mongolia Grassland Station, Huhhot, Inner Mongolia 010020, China. Electronic address:
Owing to the complicated geographical locations and climates, cultivation and selection of forage seeds are challenging. For the first time, we qualitatively distinguished the drought and cold resistance of forage seeds with the time domain and refractive index spectra using terahertz (THz) time-domain spectroscopy. A multilayer structure propagation (MSP) model was developed based on the effective medium and light transport theory to reveal the underlying biological mechanisms of drought and cold resistance of forage seeds.
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Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.
Sub-ångström spatial resolution of electron density coupled with sub-femtosecond to few-femtosecond temporal resolution is required to directly observe the dynamics of the electronic structure of a molecule after photoinitiation or some other ultrafast perturbation, such as by soft X-rays. Meeting this challenge, pushing the field of quantum crystallography to attosecond timescales, would bring insights into how the electronic and nuclear degrees of freedom couple, enable the study of quantum coherences involved in molecular dynamics, and ultimately enable these dynamics to be controlled. Here, we propose to reach this realm by employing convergent-beam x-ray crystallography with high-power attosecond pulses from a hard-x-ray free-electron laser.
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Mineralogical Society of Antwerp, Boterlaarbaan 225, 2100 Deurne, Belgium.
ConspectusWhile photochromic natural sodalites, an aluminosilicate mineral, were originally considered as curiosities, articles published in the past ten years have radically changed this perspective. It has been proven that their artificial synthesis was easy and allowed compositional tuning. Combined with simulations, it has been shown that a wide range of photochromic properties were achievable for synthetic sodalites (color, activation energy, reversibility, etc.
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