23 research outputs found
硝子体の構造とその液化との関係
The aim of the study is to clarify the vitreous body structure and liquefaction phenomena. It was found that when melting a frozen rabbit vitreous body, the gel-sol transition phenomenon occurs and the gel structure is broken. This is almost like the liquefaction of the vitreous body in vivo. We try to clarify the liquefaction phenomenon by using this animal model. The native vitreous body has three dimensional meshwork structures. After liquefaction, it is changed into two parts, namely fiber aggregates and soluble amorphous aggregates. The surface of native vitreous body meshwork is mucopolysacharide, but that of fiber aggregates after liquefaction is changed into connective tissue, which means the conformational change of vitreous body in liquefaction. The soluble proteins after liquefaction were analyzed and identified as crystallin family. It is suggested that the liquefaction is induced by detachment of non-collagenous protein beads containing crystallins, resulting in the collapse of the three dimensional structure to release watery liquid trapped within. And the new gel-sol transition model of vitreous bod is proposed.博士(医学)・乙1330号・平成26年3月17
Experimental validation of equilibria in fuel cells with dead-ended anodes
This paper investigates the nitrogen blanketing front during the dead-ended anode (DEA) operation of a PEM fuel cell. Surprisingly the dynamic evolution of nitrogen and water accumulation in the dead-ended anode (DEA) of a PEM fuel cell arrives to a steady-state suggesting the existence of equilibrium behavior. We use a multi-component model of the two-phase one-dimensional (along-the-channel) system behavior to analyze and exploit this phenomenon. Specifically, the model is first verified with experimental observations, and then utilized for showing the evolution towards equilibrium. The full order model is reduced to a second-order ordinary differential equation (ODE) with one state, which can be used to predict and amalyse the surprising but experimentally observed steady state DEA behavior
Calibration and Performance of the AKARI Far-Infrared Surveyor (FIS) -- Slow-Scan Observation Mode for Point Sources
We present the characterization and calibration of the Slow-Scan observation
mode of the Far-Infrared Surveyor (FIS) onboard the AKARI satellite. The FIS,
one of the two focal-plane instruments on AKARI, has four photometric bands
between 50--180 um with two types of Ge:Ga array detectors. In addition to the
All-Sky Survey, FIS has also taken detailed far-infrared images of selected
targets by using the Slow-Scan mode. The sensitivity of the Slow-Scan mode is
one to two orders of magnitude better than that of the All-Sky Survey, because
the exposure time on a targeted source is much longer. The point spread
functions (PSFs) were obtained by observing several bright point-like objects
such as asteroids, stars, and galaxies. The derived full widths at the half
maximum (FWHMs) are ~30'' for the two shorter wavelength bands and ~40'' for
the two longer wavelength bands, being consistent with those expected by the
optical simulation, although a certain amount of excess is seen in the tails of
the PSFs. The flux calibration has been performed by the observations of
well-established photometric calibration standards (asteroids and stars) in a
wide range of fluxes. After establishing the method of aperture photometry, the
photometric accuracy for point-sources is better than +-15% in all of the bands
expect for the longest wavelength.Comment: 25 pages, 7 figures, accepted publication in PAS
The Far-Infrared Surveyor (FIS) for AKARI
The Far-Infrared Surveyor (FIS) is one of two focal plane instruments on the
AKARI satellite. FIS has four photometric bands at 65, 90, 140, and 160 um, and
uses two kinds of array detectors. The FIS arrays and optics are designed to
sweep the sky with high spatial resolution and redundancy. The actual scan
width is more than eight arcmin, and the pixel pitch is matches the diffraction
limit of the telescope. Derived point spread functions (PSFs) from observations
of asteroids are similar to the optical model. Significant excesses, however,
are clearly seen around tails of the PSFs, whose contributions are about 30% of
the total power. All FIS functions are operating well in orbit, and its
performance meets the laboratory characterizations, except for the two longer
wavelength bands, which are not performing as well as characterized.
Furthermore, the FIS has a spectroscopic capability using a Fourier transform
spectrometer (FTS). Because the FTS takes advantage of the optics and detectors
of the photometer, it can simultaneously make a spectral map. This paper
summarizes the in-flight technical and operational performance of the FIS.Comment: 23 pages, 10 figures, and 2 tables. Accepted for publication in the
AKARI special issue of the Publications of the Astronomical Society of Japa
Short-term influence of cataract surgery on circadian biological rhythm and related health outcomes (CLOCK-IOL trial): study protocol for a randomized controlled trial
ENDOPHTHALMITIS FOLLOWING CATARACT SURGERY CONSIDERED TO BE DUE TO AN ORAL PATHOGEN
We encountered a case of endophthalmitis after cataract surgery in which α-streptococcus was regarded as prophlogistic bacillus. Preoperatively, sterilization of the eyelid and conjunctival sac was performed. The surgical methods included temporal corneal incision and surgery was completed uneventfully. Eight days postoperatively, symptoms of endophthalmitis appeared; vitrectomy and IOL extraction were performed the following day but retinal function was damaged, so the best visual acuity remained 0.01. It seemed that the most probable source of infecting bacteria came from the oral cavity. Furthermore, α-streptococcus was detected in aqueous humor, vitreous body, left eyelid skin and oral cavity. Because this patient used an artificial larynx, Tapia, discharge from the oral cavity reached the conjunctival sac