925 research outputs found
Slowing and stopping of chemical waves in a narrowing canal
The propagation of a chemical wave in a narrow, cone-shaped glass capillary
was investigated. When a chemical wave propagates from the wider end to the
narrower end, it slows, stops, and then disappears. A phenomenological model
that considers the surface effect of the glass is proposed, and this model
reproduces the experimental trends.Comment: 8 pages, 5 figure
Mode Selection in the Spontaneous Motion of an Alcohol Droplet
An alcohol (pentanol) droplet exhibits spontaneous agitation on an aqueous
solution, driven by a solutal Marangoni effect. We found that the droplet's
mode of motion is controlled by its volume. A droplet with a volume of less
than shows irregular translational motion, whereas
intermediate-sized droplets of show vectorial motion. When
the volume is above , the droplet splits into smaller drops.
These experimental results regarding mode selection are interpreted in terms of
the wave number selection depending on the droplet volume.Comment: 4 pages, 5 figure
Middle to Late Pleistocene Tephrostratigraphy of the 200-meter Core Sample from the North of Osaka BayJapan
Exploring Galaxy Evolution from Infrared Number Counts and Cosmic Infrared Background
Recently reported infrared (IR) galaxy number counts and cosmic infrared
background (CIRB) all suggest that galaxies have experienced a strong evolution
sometime in their lifetime. We statistically estimate the galaxy evolution
history from these data. We find that an order of magnitude increase of the
far-infrared (FIR) luminosity at redshift z = 0.5 - 1.0 is necessary to
reproduce the very high CIRB intensity at 140 um reported by Hauser et al.
(1998). z \sim 0.75 and decreases to, even at most, a factor of 10 toward z
\sim 5, though many variants are allowed within these constraints. This
evolution history also satisfies the constraints from the galaxy number counts
obtained by IRAS, ISO and, roughly, SCUBA. The rapid evolution of the comoving
IR luminosity density required from the CIRB well reproduces the very steep
slope of galaxy number counts obtained by ISO. We also estimate the cosmic star
formation history (SFH) from the obtained FIR luminosity density, considering
the effect of the metal enrichment in galaxies. The derived SFH increases
steeply with redshift in 0
0.75. This is consistent with the SFH estimated from the reported ultraviolet
luminosity density. In addition, we present the performance of the Japanese
ASTRO-F FIR galaxy survey. We show the expected number counts in the survey. We
also evaluate how large a sky area is necessary to derive a secure information
of galaxy evolution up to z \sim 1 from the survey, and find that at least 50 -
300 deg^2 is required.Comment: 18 pages LaTeX, PASJ in press. Abstract abridge
Single cell analysis of neutrophils NETs by Microscopic LSPR imaging system
A simple microengraving cell monitoring method for neutrophil extracellular traps
(NETs) released from single neutrophils has been realized using a polydimethylsiloxane (PDMS)
microwell array (MWA) sheet on a plasmon chip platform. An imbalance between NETs formation
and the succeeding degradation (NETosis) are considered associated with autoimmune disease and
its pathogenesis. Thus, an alternative platform that can conduct monitoring of this activity on single
cell level at minimum cost but with great sensitivity is greatly desired. The developed MWA
plasmon chips allow single cell isolation of neutrophils from 150 μL suspension (6.0 × 105 cells/mL)
with an efficiency of 36.3%; 105 microwells with single cell condition. To demonstrate the utility of
the chip, trapped cells were incubated between 2 to 4 h after introducing with 100 nM phorbol 12-
myristate 13-acetate (PMA) before measurement. Under observation using a hyperspectral imaging
system that allows high-throughput screening, the neutrophils stimulated by PMA solution show a
significant release of fibrils and NETs after 4 h, with observed maximum areas between 314–758
μm2. An average absorption peak wavelength shows a redshift of Δλ = 1.5 nm as neutrophils release
NETs
physiological severity of total occlusion in the coronary artery detected by transthoracic doppler echocardiography at rest: diastolic reverse coronary flow versus exercise 201-TI single photon emission computed tomography
Near-Infrared Spectroscopic Assessment of Haemodynamic Activation in the Cerebral Cortex - A Review in Developmental Psychology and Child Psychiatry
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