Biography:

In the past Satoshi Wada has collaborated on articles with Fumio Takeshita and Shohei Yomogida. One of their most recent publications is Increased guarding duration reduces growth and offspring number in females of the skeleton shrimp Caprella penantis. Which was published in journal Animal Behaviour.

More information about Satoshi Wada research including statistics on their citations can be found on their Copernicus Academic profile page.

Satoshi Wada's Articles: (11)

Increased guarding duration reduces growth and offspring number in females of the skeleton shrimp Caprella penantis

The reproductive strategy of one sex often imposes fitness costs on the other. In crustaceans, precopulatory mate guarding often imposes reproductive costs on females. In iteroparous species with indeterminate growth, such costs may affect not only current reproduction but also growth and lifetime fecundity. We investigated the cost imposed by male mate guarding on the long-term reproductive fitness of females in the skeleton shrimp Caprella penantis. We kept skeleton shrimps for 50 days in three different sex ratio treatments: male biased, even and female biased. Five female fitness components were recorded: survival rate, growth rate, number of clutches, clutch interval and average number of juveniles. Occurrence and duration of guarding increased in the male-biased treatment, indicating that males responded to changes in mate availability through increased guarding. Females under the male-biased sex ratio showed reduced growth rate owing to the longer guarding duration and were consequently smaller. No significant difference between treatments was found in the number of and interval between clutches, but, compared with the even sex ratio treatment, females in the male-biased treatment produced fewer juveniles on average than those in the female-biased treatment. These results indicate that extended guarding duration imposes long-term costs on female fitness in the form of decreased growth and low offspring production.

Float zone growth and anisotropic spectral properties of Nd:LaVO4 single crystals

AbstractNd:LaVO4 single crystals were successfully grown by the floating zone method and their optical properties along each optic elasticity axis were investigated. The crystals grown at 10 mm/h in air did not contain any macroscopic defects for Nd-concentrations upto 5 at%. The optic elasticity axes were determined by the conoscopic figures with a polarizing microscope. The absorption cross-section along the Z-axis was 2.6×10−20 cm2 near 800 nm and the FWHM was 20 nm. The absorption cross-sections along other directions were much the same as that along the Z-axis. The fluorescence lifetime of the 5 at%-doped crystal was approximately 80 μs. All the polarized fluorescence spectra of the Nd:LaVO4 single crystal had a broadened band around 1060 nm with FWHMs of 7–10 nm, which are wide enough to generate femtosecond order pulses.

Demonstration designs for the remediation of space debris from the International Space Station

Highlights•A debris remediation system with a wide angle telescope and a laser transmitter.•A step-by-step approach using the International Space Station (ISS).•Proof of principle demonstration of the detection with an ISS based prototype.•Technical demonstrator with an EUSO telescope and a space CAN laser.•A free-flyer mission dedicated to debris remediation with the altitude ~800 km.

Luminescent silicon nanoparticles covered with ionic liquid

Highlights•Luminescent silicon nanoparticles with ionic liquid (IL) were synthesized.•Emission efficiency of Si nanoparticles with IL is larger than that without IL.•Luminescence from silicon nanoparticles with IL is observed for two weeks.

Enhanced piezoelectric properties of barium titanate–potassium niobate nano-structured ceramics by MPB engineering

AbstractBarium titanate (BaTiO3, BT)–potassium niobate (KNbO3, KN) (BT–KN) nanocomplex ceramics with various KN/BT molar ratios were prepared by the solvothermal method. From a transmittance electron microscopy (TEM) observation, it was confirmed that KN layer thickness of the BT–KN nanocomplex ceramics was controlled from 0 to 44 nm by controlling KN/BT molar ratios. Their dielectric constants were measured at room temperature and 1 MHz, and a maximum dielectric constant of around 400 was measured for the BT–KN nanocomplex ceramics with a KN thickness of 22 nm. TEM observation revealed that below KN thickness of 22 nm, BT/KN heteroepitaxial interface was assigned to the strained interface while over 22 nm, the interface was assigned to the relaxed one. These results suggested that the strained heteroepitaxial interface could be responsible for the enhanced dielectric constants.

Electrochemical properties and lithium ion solvation behavior of sulfone–ester mixed electrolytes for high-voltage rechargeable lithium cells

AbstractSulfone–ester mixed solvent electrolytes were examined for 5 V-class high-voltage rechargeable lithium cells. As the base-electrolyte, sulfolane (SL)–ethyl acetate (EA) (1:1 mixing volume ratio) containing 1 M LiBF4 solute was investigated. Electrolyte conductivity, electrochemical stability, Li+ ion solvation behavior and cycleability of lithium electrode were evaluated. 13C NMR measurement results suggest that Li+ ions are solvated with both SL and EA. Charge–discharge cycling efficiency of lithium anode in SL–EA electrolytes was poor, being due to its poor tolerance for reduction. To improve lithium charge–discharge cycling efficiency in SL–EA electrolytes, following three trials were carried out: (i) improvement of the cathodic stability of electrolyte solutions by change in polarization through modification of solvent structure; isopropyl methyl sulfone and methyl isobutyrate were investigated as alternative SL and EA, respectively, (ii) suppression of the reaction between lithium and electrolyte solutions by addition of low reactivity surfactants of cycloalkanes (decalin and adamantane) or triethylene glycol derivatives (triglyme, 1,8-bis(tert-butyldimethylsilyloxy)-3,6-dioxaoctane and triethylene glycol di(methanesulfonate)) into SL–EA electrolytes, and (iii) change in surface film by addition of surface film formation agent of vinylene carbonate (VC) into SL–EA electrolytes. These trials made lithium cycling behavior better. Lithium cycling efficiency tended to increase with a decrease in overpotential. VC addition was most effective for improvement of lithium cycling efficiency among these additives. Stable surface film is formed on lithium anode by adding VC and the resistance between anode/electrolyte interfaces showed a constant value with an increase in cycle number. When the electrolyte solutions without VC, the interfacial resistance increased with an increase in cycle number. VC addition to SL–EA was effective not only for Li/LiCoO2 cell with charge cut-off voltage of 4.5 V but also for Li/LiNi0.5Mn1.5O4 cells even with high charge cut-off voltage of 5 V in Li/LiNi0.5Mn1.5O4 cells.

Crystal quality and optical properties for Nd:GdVO4 single crystals by a floating zone method

AbstractSingle crystals of neodymium-doped gadolinium orthovanadate (Nd:GdVO4) were successfully grown by the floating zone method (FZ) with an infrared convergence type heater. These crystal quality and optical properties are sufficient for application to a laser host. Distribution of (Nd/Nd + Gd) concentration by 50 mm in the growth direction was 0.20 ± 0.02 against a target concentration of 0.20. Distribution of extinction ratio at 633 nm by 50 mm in the growth direction was 51 ± 2 dB. Laser performance for these crystals with a-cut were measured. The maximum slope efficiency was 65% and the maximum output power was 3.4 W with continuous wave at 808 nm.

Short CommunicationA new effect of ultrasonication on the formation of BaTiO3 nanoparticles

AbstractA new effect of ultrasonic irradiation on the formation of BaTiO3 particles was identified. Ultrasonication caused the aggregation of the original 5–10 nm BaTiO3 particles in the same crystal axis and accelerated the formation of BaTiO3 particles significantly. Furthermore, narrow size distribution was obtained for the aggregated particles under ultrasonic irradiation.

Lipase-catalyzed synthesis of polyesters from anhydride derivatives involving dehydration

AbstractLipase-catalyzed synthesis of aliphatic polyesters has been achieved by using anhydride derivatives as starting substrate. Candida antarctica lipase efficiently catalyzed the dehydration reaction of polyanhydrides and glycols in toluene, yielding the corresponding polyesters. Effects of the reaction parameters on the polymer yield and molecular weight have been systematically investigated. The dehydration reaction also proceeded in water and supercritical carbon dioxide (scCO2). The reaction behaviors depended on the monomer structure and reaction media. Cyclic anhydrides, succinic, glutaric, and diglycolic anhydrides, were enzymatically polymerized with α,ω-alkylene glycols in toluene to give the polyesters. Under appropriate reaction conditions, the molecular weight reached 1×104.

Growth of BaTiO3 nanoparticles in ethanol–water mixture solvent under an ultrasound-assisted synthesis

AbstractBaTiO3 nanoparticles were sonochemically synthesized in ethanol–water mixture solution at low temperature. Different growth mechanisms of the BaTiO3 particles were identified in aqueous solution and ethanol–water solution under ultrasonication. Nanocrystals firstly formed and then oriented aggregated into large particles in aqueous solution under ultrasonic irradiation. Compared to the synthesis in aqueous solution, the BaTiO3 nanoparticles could be prepared at low temperature in ethanol–water solution. Furthermore, the oriented aggregation of BaTiO3 nanocrystals was suppressed and the BaTiO3 nanoparticles grew up from the Ti-based precursor through a dissolution–precipitation process.

Asporin stably expressed in the surface layer of mandibular condylar cartilage and augmented in the deeper layer with age

Highlights•Asporin gene and protein were highly expressed in mandibular condylar cartilage as compared to tibial epiphyseal cartilage.•Asporin in mandibular condylar cartilage was augmented with age.•TGF-β signaling is suppressed by augmented Asporin and decreased TGF-β production in mandibular condylar cartilage.

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