Masakazu Iwasaka

ORCID: 0000-0003-4213-7390
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About
Contact & Profiles
Research Areas
  • Magnetic and Electromagnetic Effects
  • Electromagnetic Fields and Biological Effects
  • Spaceflight effects on biology
  • Biofield Effects and Biophysics
  • Photoreceptor and optogenetics research
  • Characterization and Applications of Magnetic Nanoparticles
  • Microfluidic and Bio-sensing Technologies
  • Metamaterials and Metasurfaces Applications
  • bioluminescence and chemiluminescence research
  • Photonic Crystals and Applications
  • Neurobiology and Insect Physiology Research
  • Electrowetting and Microfluidic Technologies
  • Geomagnetism and Paleomagnetism Studies
  • Blood properties and coagulation
  • Liquid Crystal Research Advancements
  • Orbital Angular Momentum in Optics
  • Cephalopods and Marine Biology
  • Micro and Nano Robotics
  • Gout, Hyperuricemia, Uric Acid
  • Freezing and Crystallization Processes
  • Physiological and biochemical adaptations
  • Insect and Arachnid Ecology and Behavior
  • Optical Polarization and Ellipsometry
  • Scientific Research and Discoveries
  • Porphyrin Metabolism and Disorders

Hiroshima University
2016-2025

X-Fab (Germany)
2018

Japan Science and Technology Agency
2011-2015

Chiba University
2005-2014

First Affiliated Hospital of Anhui Medical University
2010

Anhui Medical University
2010

Université de Rouen Normandie
2010

Hôpital Charles-Nicolle
2010

University of Naples Federico II
2010

Université Libre de Bruxelles
2010

Abstract The induction of bone formation to an intentional orientation is a potentially viable clinical treatment for disorders. Among the many chemical and physical factors, static magnetic field (SMF) tesla order can regulate shapes blood cells matrix fibers. This study investigated effects strong SMF (8 T) on in both vivo vitro systems. After 60 h exposure SMF, cultured mouse osteoblastic MC3T3-E1 were transformed rodlike orientated direction parallel field. Although this did not affect...

10.1359/jbmr.2002.17.10.1814 article EN Journal of Bone and Mineral Research 2002-10-01

This study focuses on the properties of diamagnetic fluid in static magnetic fields up to 8 T with gradient 50 T/m. We used a horizontal type superconducting magnet bore 100 mm diameter and 700 long. observed phenomenon that surface water was pushed back by higher gradients. Two ‘‘frozen’’ cascades were formed at z=±50–80 mm; near center parted, bottom chamber appeared. The level both ends lifted up. In order investigate hydrodynamics fields, we made fluidic circuit plastic tubing which...

10.1063/1.356686 article EN Journal of Applied Physics 1994-05-15

Magnetic field effects on the surface profile have been investigated for water and copper sulfate aqueous solutions that very small magnetic susceptibility. When a of 10 T is applied in horizontal superconducting magnet, distilled was lowered by 39 mm at center, relative to level zero region (Moses effect). In contrast, nearly saturated solution raised roughly same height center (reversed Moses The profiles were systematically explained based dia- paramagnetic volume susceptibility values...

10.1143/jjap.34.l991 article EN Japanese Journal of Applied Physics 1995-08-01

In this study, we investigated the effects of strong magnetic fields up to 14 T on near-infrared spectrum water molecules. We used a spectrophotometer, which has an external optical cell box in superconducting magnet. measured range 900–2000 nm by changing path lengths from 0.1 100 mm. The peak wavelengths water, increased length 1–3 under field. Also, glucose solutions field at investigate hydration sugar. contrast case wavelength showed blueshift When were changed 0 T, differential...

10.1063/1.367737 article EN Journal of Applied Physics 1998-06-01

As has become known, most materials, such as proteins and DNA, show orientation under strong magnetic fields. However, the critical threshold for field of magnetomechanical phenomena is still unknown. We demonstrate that a thin micro-mirror from fish scale with high reflectivity exhibits distinct response at 100 mT. A dramatic event decrease light scattering guanine crystals well rapid rotation against applied field. Enhancement intensity also observed when three vectors incidence, field,...

10.1021/la400046a article EN Langmuir 2013-03-07

There are no reported studies on the effects of magnetic fields osteoblast collagen secretory processes during differentiation. It is important to understand effect magnetic-field exposure since bone remodeled continuously by bone-forming osteoblasts and bone-resorbing osteoclasts. We hypothesized that a mixture osteoblasts, an adherent cell, would orient perpendicular field fibers known fields. As proliferate along fibers, orientation will change direction as well. tested this hypothesis...

10.1063/1.372652 article EN Journal of Applied Physics 2000-05-01

We investigated the acute effect of static magnetic fields up to 8 T on skin blood flow and body temperature in anesthetized rats. These variables were measured prior to, during, following exposure a field superconducting magnet with horizontal bore. The dorsal was transversely incised for 1 cm make subcutaneous pocket. Probes laser Doppler flowmeter thermistor inserted into pocket positioned at mid-dorsum measure temperature. Another probe put rectum monitor rectal After baseline...

10.1002/(sici)1521-186x(200004)21:3<183::aid-bem5>3.0.co;2-5 article EN Bioelectromagnetics 2000-04-01

The purpose of the study is to clarify effect and mechanism magnetic fields on freeze processes in aqueous solutions. In present study, an ice crystal formation process biological solutions under pulsed train (PMF) up 325 T/s at 6.5 mT was observed. field generators were set a freezer, which controlled temperature between 10C −30 °C. During solution, disk-like domains appeared, PMF-exposure exhibited vibration floating objects induced electric directions cooled condition when frequency...

10.1063/1.3556776 article EN Journal of Applied Physics 2011-04-01

The present study provides evidence that a kind of nucleic acid base crystal, guanine shows distinct magnetic orientation. Under the condition where crystal boards were lying on glass surface due to gravity, gradually oriented their length applied horizontal fields 400 mT. On other hand, vertical parallel Earth's gravity caused width be along fields. Moreover, combining both and produced rapid alignment

10.7567/apex.6.037002 article EN Applied Physics Express 2013-03-01

A new technique of cell micropatterning was presented. Mouse osteoblast cells (MC3T3-E1) were seeded on a substrate whose surface exposed to periodically modulated magnetic field (a line pattern with 200- or 600-microm pitch) produced by modulator inserted into homogeneous 1 T generated an electromagnet. The trapped consistent the profile field. trapping efficiency enhanced adding Mn(II)EDTA (paramagnetic) cultivation medium. subsequently incubated in same applied whole blood red cells.

10.1021/la047517z article EN Langmuir 2004-12-30

Bioinspired but static optical devices such as lenses, retarders, and reflectors have had a significant impact on the designs of many man-made technologies. However, while numerous adaptive flexible mechanisms are found throughout animal kingdom, highly desirable biomimetic copies these remarkable smart systems remain, in cases, distant dream. Many aquatic animals evolved efficient based multilayer stacks crystallized nucleic acid base guanine. With exceptional levels spectral intensity...

10.1021/acs.langmuir.5b03522 article EN Langmuir 2015-12-12

Abstract Neoscopelus is a genus of deep‐sea fishes with ventral–lateral photophores, likely used for counterillumination. In this study, we report novel functional structure spectral filter in the bioluminescence mechanism microchir . Photocytes are innervated and located inside new type photophore composed web‐like branched chambers filled red‐pigmented cells. The branches extend beyond along epidermis. blue light produced photocytes red‐shifted to blue‐green by effect, matching emitted...

10.1111/jfb.70046 article EN Journal of Fish Biology 2025-04-08

We observed the phenomenon that water was parted by a magnetic field at 8 T. Two "water-walls" were formed and surface of parted. The bottom chamber appeared when exposed to fields up This paper focuses on mechanism this phenomenon. change in lowest level 22 mm mere changed from 0 T T, decrease proportionate B/sup 2/ center magnet. also investigated effect temperature formation water-wall. water-wall both 0/spl deg/C 100/spl deg/C. Finally, we mixed NaCl ions absolute declined as...

10.1109/20.334193 article EN IEEE Transactions on Magnetics 1994-01-01

Abstract In this study, we present experimental evidence showing that coccoliths have light-scattering anisotropy contributes to a possible control of solar light exposure in the ocean. Changing angle between incident and an applied magnetic field causes differences intensities suspension isolated from Emiliania huxleyi . The effect is induced by diamagnetic torque force directing coccolith radial plane perpendicular fields at 400 500 mT. developed technique reveals anisotropies...

10.1038/srep13577 article EN cc-by Scientific Reports 2015-09-01

The effect of magnetic fields on the orientation adherent cells was investigated quantitatively using a long-term field exposure system at 8 T. Smooth muscle cells, which are classified as were passaged and dispersed in Dulbecco's Modified Eagle's Medium (DMEM). A cell culture flask filled to capacity with smooth suspension, placed center superconducting magnet's bore. incubated for 3 days, exhibited randomly oriented patterns rod-like shaped without exposure. In contrast, exposed Tesla (T)...

10.1109/20.951344 article EN IEEE Transactions on Magnetics 2001-07-01

Recently, structural colour formation and light control by accumulated guanine crystals were reported. However, the relationship between interference platelets intensity in an individual platelet must be examined further. This study presents experimental evidence that crystal of fishes aid efficiently controlling enhancement based on floating a micro-space. In addition, magnetic orientation technique enabled us to dynamically modulate arrangement water. A group under fields exhibited...

10.1038/s41598-018-34866-x article EN cc-by Scientific Reports 2018-11-12

To assess the possibility that strong static magnetic fields cause DNA damage and mutation, we examined genotoxic effects of field exposure by using somatic mutation recombination test system in repair-proficient -deficient strains Drosophila melanogaster. A postreplication repair-defective mei-41D5 and/or a nucleotide excision mei-9(a) was introduced into conventional loss heterozygosity assay use mwh +/ + flr transheterozygotes, were exposed to up 14 Tesla (T). We found 2, 5, or T for 24 h...

10.1269/jrr.45.393 article EN cc-by-nc Journal of Radiation Research 2004-01-01

Light scattering in a guanine crystal plate of goldfish scales was observed with and without static magnetic field exposure. Under microscopic image dark-field-illumination, the structural color scale by plates observed, isolated chromatophores showed twinkling which intermittent light from side. The quenched fields more than 0.26 tesla (T). quenching reversibly occurred when applied external were changed between ambient 5 T. did not improve decreased to 0.3 It recovered original state about...

10.1063/1.3357348 article EN Journal of Applied Physics 2010-05-01

In the present study, we prepared a diamagnetic fluid with magnetically controlled visual transparency. Light scattering control by magnetic orientation of organic and microcrystals was applied for developing functional fluid, controlling its turbidity The light guanine crystal particles suspension (GPS), which were collected from scales goldfish, in an aqueous solution. It is revealed that GPS can fields. method developed be utilized visibility light-reflective objects using fields on...

10.1063/1.4862083 article EN Applied Physics Letters 2014-01-13

10.1007/s11626-003-0005-0 article EN In Vitro Cellular & Developmental Biology - Animal 2003-03-01

The authors' study first focuses on the role of ferromagnetic particles in magnetic orientation fibrin polymers. Rod-like were mixed into a solution fibrinogen. polymerization process was exposed to field 8 T. Magnetic agglomerated form chains clusters which oriented parallel fields. polymers did not occur near particles. In possible effects fields fibrinolytic process, dissolution formed due observed. activities evaluated by absorbance changes at 500 nm and plate method. A distinguishable...

10.1109/20.281173 article EN IEEE Transactions on Magnetics 1993-11-01

The question of whether or not magnetic fields affect enzymatic activity is considerable interest in biomagnetics and biochemistry. This study focuses on magnetically related activities can be affected by fields. We examined the effect up to 8 T catalytic decomposition hydrogen peroxide (H2O2). observed changes absorbance reaction mixture catalase at 240 nm, during after field exposures. When was treated with nitrogen-gas bubbling, it that initial rate which exposed 50%–85% lower than...

10.1063/1.361646 article EN Journal of Applied Physics 1996-04-15
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