Publications by authors named "Daichi Kato"

20 Publications

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Taxonomic study of the genus Eloeophila Rondani, 1856 of Japan (Limoniidae, Diptera).

Authors:
Daichi Kato

Zootaxa 2021 Jul 1;4995(3):425-451. Epub 2021 Jul 1.

Echigo-Matsunoyama Museum of Natural Sicences, 'Kyororo, 1712-2 Matsunoyama, Tkamachi, 942-1411, Japan. .

Japanese species of the genus Eloeophila are revised. Five new species, E. apicisetula sp. nov., E. canidorsalis sp. nov., E. enischnophallus sp. nov., E. hadrophallus sp. nov., and E. tergilobellus sp. nov. are described. One subspecies and two species are synonymized, E. subaprilina yezoensis (Alexander, 1924) with the nominotypical subspecies, E. hidana (Alexander, 1970) with E. persalsa (Alexander, 1940), and E. mishimai (Alexander, 1969) with E. kintaro (Alexander, 1957). Images of the habitus and wings, and drawings of the male terminalia of the Japanese species are shown. Distributions and a key to the Japanese species are provided.
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http://dx.doi.org/10.11646/zootaxa.4995.3.2DOI Listing
July 2021

Dehydration of Electrochemically Protonated Oxide: SrCoO with Square Spin Tubes.

J Am Chem Soc 2021 Oct 14;143(42):17517-17525. Epub 2021 Oct 14.

Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.

Controlling oxygen deficiencies is essential for the development of novel chemical and physical properties such as high- superconductivity and low-dimensional magnetic phenomena. Among reduction methods, topochemical reactions using metal hydrides (e.g., CaH) are known as the most powerful method to obtain highly reduced oxides including NdSrNiO superconductor, though there are some limitations such as competition with oxyhydrides. Here we demonstrate that electrochemical protonation combined with thermal dehydration can yield highly reduced oxides: SrCoO thin films are converted to SrCoO by dehydration of HSrCoO at 350 °C. SrCoO forms square (or four-legged) spin tubes composed of tetrahedra, in contrast to the conventional infinite-layer structure. Detailed analyses suggest the importance of the destabilization of the SrCoO precursor by electrochemical protonation that can greatly alter reaction energy landscape and its gradual dehydration (HSrCoO) for the SrCoO formation. Given the applicability of electrochemical protonation to a variety of transition metal oxides, this simple process widens possibilities to explore novel functional oxides.
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http://dx.doi.org/10.1021/jacs.1c07043DOI Listing
October 2021

BiOCl ( = Ba, Sr, Ca) with Double and Triple Fluorite Layers for Visible-Light Water Splitting.

Inorg Chem 2021 Oct 1;60(20):15667-15674. Epub 2021 Oct 1.

Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.

Layered oxyhalides containing double or triple fluorite layers are promising visible-light-responsive water-splitting photocatalysts with unique band structures. Herein, we report on the synthesis, structure, and photocatalytic property of BiBaOCl (4/) with alternating double (BiO) and triple (BiBaO) fluorite layers, which was extracted from the crystallographic database on the basis of Madelung potential calculations. Rietveld refinements from powder X-ray and neutron diffraction data revealed the presence of cationic disorder between BiO and BiBaO layers, leading to electrostatic stabilization. DFT calculations suggested that photogenerated electrons and holes flow through the double and triple layers, respectively, which may suppress electron-hole recombination. We expanded this double-triple system to include BiCaOCl and BiSrOCl with orthorhombic distortions and different degrees of cationic disorder, which allow band gap tuning. All the double-triple compounds BiOCl showed stable water-splitting photocatalysis in the presence of a sacrificial reagent.
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http://dx.doi.org/10.1021/acs.inorgchem.1c02344DOI Listing
October 2021

Detailed description and illustration of larva, pupa and imago of (Westwood, 1876) (Diptera: Tipulidae) from Japan.

Biodivers Data J 2021 1;9:e58009. Epub 2021 May 1.

Center for Marine Environmental Studies (CMES), Ehime University, Matsuyama, Japan Center for Marine Environmental Studies (CMES), Ehime University Matsuyama Japan.

Background: Loew, 1863 (Diptera: Tipulidae) is a relatively large crane fly genus with a wide distribution in the Afrotropic, Australasian-Oceanian, Eastern Palearctic, Oriental and Nearctic Regions. Although the genus is well known to include the largest crane fly species, the immature stages are, thus far, only described for the larva and pupa of the North American Arnaud & Byers, 1990.

New Information: In this study, we describe for the first time the egg, larva and pupae of the Japanese (Westwood, 1876). Larvae were collected from semi-aquatic habitats, from slow flowing areas of streams and small waterfalls where leaf litter accumulates; the larvae are detritivores and feed on wet, decomposing leaves. The larvae were reared to adults in the laboratory. Morphological characters of immature stages discussed with comparison with the North American . Male and female genitalia are illustrated and described in detail for the first time.
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http://dx.doi.org/10.3897/BDJ.9.e58009DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8106672PMC
May 2021

Conduction Band Control of Oxyhalides with a Triple-Fluorite Layer for Visible Light Photocatalysis.

J Am Chem Soc 2021 Feb 8;143(6):2491-2499. Epub 2021 Jan 8.

Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.

The discovery of building blocks offers new opportunities to develop and control properties of extended solids. Compounds with fluorite-type BiO blocks host various properties including lead-free ferroelectrics and photocatalysts. In this study, we show that triple-layered BiMO blocks (M = Bi, La, Y) in BiMOCl allow, unlike double-layered BiO blocks, to extensively control the conduction band. Depending on M, the BiMO block is truncated by Bi-O bond breaking, resulting in a series of -zigzag chain structures ( = 1, 2, ∞ for M = Bi, La, Y, respectively). Thus, formed chain structures are responsible for the variation in the conduction band minimum (-0.36 to -0.94 V vs SHE), which is correlated to the presence or absence of mirror symmetry at Bi. BiYOCl shows higher photoconductivity than the most efficient BiO-based photocatalyst with promising visible-light photocatalytic activity for water splitting. This study expands the possibilities of thickening (2D to 3D) and cutting (2D to 1D) fluorite-based blocks toward desired photocatalysis and other functions.
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http://dx.doi.org/10.1021/jacs.0c10288DOI Listing
February 2021

Revision of Japanese species of Alexander, 1924 (Diptera, Pediciidae).

Zookeys 2020 3;1000:71-105. Epub 2020 Dec 3.

Center for Marine Environmental Studies (CMES), Ehime University, Matsuyama, Ehime 790-8577, Japan.

Japanese species of the genus Alexander, 1924 are revised. Two new species, Kolcsár & Kato, and Kolcsár & Kato, are described from the Ryukyu Islands. Images of habitus and wings, illustrations of male and female terminalia, and distribution maps are provided for the Japanese species. A key to the world species of is added. DNA barcodes of three Japanese are provided, representing the first barcodes from the genus.
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http://dx.doi.org/10.3897/zookeys.1000.55021DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7728730PMC
December 2020

Synopsis of the genus Osten Sacken, 1869 (Diptera, Limoniidae) in Japan.

Zookeys 2020 30;999:147-163. Epub 2020 Nov 30.

Center for Marine Environmental Studies (CMES), Ehime University, Matsuyama, Ehime 790-8577, Japan Ehime University Ehime Japan.

Japanese species of the genus Osten Sacken, 1869 are revised and Kato & Kolcsár, and Kato & Kolcsár, are described. A key to the four Japanese species of the genus is provided, with images of habitus and wings, and drawings of their male terminalia. Kato & Kolcsár, is the first representative of the genus discovered from the Oriental region.
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http://dx.doi.org/10.3897/zookeys.999.52831DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7723878PMC
November 2020

Efficient Actor-Critic Reinforcement Learning With Embodiment of Muscle Tone for Posture Stabilization of the Human Arm.

Neural Comput 2021 01 20;33(1):129-156. Epub 2020 Oct 20.

Toyota Central R&D Labs., Aichi 480-1192 Japan

This letter proposes a new idea to improve learning efficiency in reinforcement learning (RL) with the actor-critic method used as a muscle controller for posture stabilization of the human arm. Actor-critic RL (ACRL) is used for simulations to realize posture controls in humans or robots using muscle tension control. However, it requires very high computational costs to acquire a better muscle control policy for desirable postures. For efficient ACRL, we focused on embodiment that is supposed to potentially achieve efficient controls in research fields of artificial intelligence or robotics. According to the neurophysiology of motion control obtained from experimental studies using animals or humans, the pedunculopontine tegmental nucleus (PPTn) induces muscle tone suppression, and the midbrain locomotor region (MLR) induces muscle tone promotion. PPTn and MLR modulate the activation levels of mutually antagonizing muscles such as flexors and extensors in a process through which control signals are translated from the substantia nigra reticulata to the brain stem. Therefore, we hypothesized that the PPTn and MLR could control muscle tone, that is, the maximum values of activation levels of mutually antagonizing muscles using different sigmoidal functions for each muscle; then we introduced antagonism function models (AFMs) of PPTn and MLR for individual muscles, incorporating the hypothesis into the process to determine the activation level of each muscle based on the output of the actor in ACRL. ACRL with AFMs representing the embodiment of muscle tone successfully achieved posture stabilization in five joint motions of the right arm of a human adult male under gravity in predetermined target angles at an earlier period of learning than the learning methods without AFMs. The results obtained from this study suggest that the introduction of embodiment of muscle tone can enhance learning efficiency in posture stabilization disorders of humans or humanoid robots.
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http://dx.doi.org/10.1162/neco_a_01333DOI Listing
January 2021

Thermoelectric Properties of (Ba,K)ZnAs Crystallized in the ThCrSi-type Structure.

Inorg Chem 2020 May 10;59(9):5828-5834. Epub 2020 Apr 10.

National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.

The compound BaKZnAs has a low-temperature phase (α-phase) crystallized in the α-BaCuS-type structure and a high-temperature phase (β-phase) crystallized in the ThCrSi-type structure. We successfully obtained the β-phase at room temperature as a metastable state by quenching from above the structural phase transition. This allowed us to determine the thermoelectric properties of the β-phase from room to high temperature in the range of 0.00 ≤ ≤ 0.10. The lattice thermal conductivity is quite low, with a value less than 1 W/mK at 773 K, independent of . The effective suppression may be due to lattice instability in the underdoped region and to randomness in the overdoped region. The maximum dimensionless figure-of-merit was 0.30 at 773 K for = 0.03 with the power factor of 0.61 mW/mK, which is relatively high for a ThCrSi-type structure. The results demonstrate the effectiveness of quenching for obtaining a low lattice thermal conductivity, thus providing a new method for attaining high thermoelectric performance.
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http://dx.doi.org/10.1021/acs.inorgchem.9b02680DOI Listing
May 2020

Synthesis, X-ray Crystal Structure, and Photochromism of a Sandwich-Type Mono-Aluminum Complex Composed of Two Tri-Lacunary α-Dawson-Type Polyoxotungstates.

Materials (Basel) 2019 Jul 26;12(15). Epub 2019 Jul 26.

Department of Chemistry, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.

The synthesis and molecular structure of a dimeric, mono-aluminum complex composed of two tri-lacunary α-Dawson polyoxometalates, [HAl(B-α-PWO)] (1), is described herein. The tetra--butylammonium salt of 1, [(-CH)N][HAl(B-α-PWO)] (TBA-1) was prepared by passing an aqueous solution of K[B-α-HPWO{Al(OH)}]⋅14HO through an ion-exchange resin column (H-form), followed by addition of tetra--butylammonium bromide. Analytically pure and colorless crystals of TBA-1 were obtained via vapor diffusion from acetonitrile/methanol at ~25 °C. Single-crystal X-ray structure analysis revealed that a six-coordinate aluminum ion was sandwiched between two tri-lacunary α-Dawson-type units, resulting in an overall symmetry. The characterization of TBA-1 was accomplished by elemental analyses, thermogravimetric/differential thermal analyses, Fourier-transform infrared spectroscopy, and solution P nuclear magnetic resonance spectroscopy. The photochromic properties of TBA-1 were also characterized in methanol under light irradiation (λ = 365 nm and ≥400 nm).
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http://dx.doi.org/10.3390/ma12152383DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6696191PMC
July 2019

Clinical features and management of traumatic ophthalmic artery aneurysm: a case report and literature review.

Br J Neurosurg 2019 Mar 20:1-5. Epub 2019 Mar 20.

a Department of Neurosurgery , Tokyo Medical University , Tokyo , Japan.

We report a 52-year-old man with progressive disturbance of visual acuity following a head injury. Magnetic resonance imaging (MRI) showed an aneurysm of the internal carotid artery. Digital subtraction angiography (DSA) 57 days after onset found that the aneurysm originated in the proximal ophthalmic artery. We treated the patient with an intravascular coil embolization, partially filling the aneurysm. Follow-up DSA indicated that the aneurysm did not recur.
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http://dx.doi.org/10.1080/02688697.2019.1587382DOI Listing
March 2019

Revision of the subgenus Dicranomyia (Erostrata) Savchenko, 1976 (Diptera, Limoniidae) of Japan.

Zootaxa 2018 Jun 26;4441(1):181-194. Epub 2018 Jun 26.

Biosystematics Laboratory, Graduate School of Integrated Sciences for Global Society, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan.

The six Japanese species of the subgenus Dicranomyia (Erostrata) Savchenko, 1976 are revised. D. (E.) globithorax Osten Sacken, 1869 and D. (E.) tabashii (Alexander, 1934) are newly recorded from Japan. We elevate the two subspecies of D. globithorax to species rank based on distinct morphological differences. Three new species, D. (E.) reniformis sp. nov., D. (E.) submelas sp. nov., and D. (E.) yazuensis sp. nov. are described. The male genitalia of all Japanese species and female ovipositors of four of the six species are illustrated, and the habitus of adults are photographed. A key to the Japanese species of the subgenus is provided.
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http://dx.doi.org/10.11646/zootaxa.4441.1.11DOI Listing
June 2018

Post-embolization neurological syndrome after embolization for intracranial and skull base tumors: transient exacerbation of neurological symptoms with inflammatory responses.

Neuroradiology 2018 Aug 18;60(8):843-851. Epub 2018 Jun 18.

Department of Neurosurgery, Tokyo Medical University, 6-7-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan.

Purpose: Pre-operative embolization is an effective treatment strategy for hypervascular intracranial and skull base tumors. However, neurological complications resulting from tumor swelling, cranial nerve ischemia, or hemorrhage can occur after embolization. The purpose of this study was to examine the relationship between neurological complications following pre-operative embolization and minor adverse events including fever, headache, or increasing inflammation, which are common after embolization for abdominal tumors (i.e., post-embolization syndrome, PES).

Methods: We retrospectively reviewed 39 consecutive patients with pre-operative embolization for intracranial and skull base tumors. Neurological symptoms and minor adverse events were regularly observed after embolization. The degree of devascularization was evaluated using enhanced magnetic resonance imaging. We also evaluated changes in peritumoral edema.

Results: Neurological complications occurred in eight cases, five of whom had exacerbation of existing neurological symptoms, which occurred concurrent with a general inflammatory response. We termed this clinical condition post-embolization neurological syndrome (PENS). The mean time to neurological symptom onset was 37.2 h after embolization. PENS was self-limiting in all cases but one, which required emergency surgery. The remaining three cases were diagnosed with cranial nerve ischemia.

Conclusions: PENS is an important neurological complication after pre-operative embolization, which should be distinguished from ischemic or hemorrhagic complications. PES is a minor complication with favorable prognosis, whereas PENS should be considered as a dangerous clinical sign that may require emergency treatment. Further experiments are needed to elucidate the pathology of PENS.
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http://dx.doi.org/10.1007/s00234-018-2047-8DOI Listing
August 2018

Comparative transcriptome analysis of rumen papillae in suckling and weaned Japanese Black calves using RNA sequencing.

J Anim Sci 2018 Jun;96(6):2226-2237

Laboratory of Animal Physiology, Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, Japan.

The length and density of rumen papillae starts to increase during weaning and growth of ruminants. This significant development increases the intraruminal surface area and the efficiency of VFA (acetate, propionate, butyrate, etc.) uptake. Thus, it is important to investigate the factors controlling the growth and development of rumen papillae during weaning. This study aimed to compare the transcriptomes of rumen papillae in suckling and weaned calves. Total RNA was extracted from the rumen papillae of 10 male Japanese Black calves (5 suckling calves, 5 wk old; 5 weaned calves, 15 wk old) and used in RNA-sequencing. Transcript abundance was estimated and differentially expressed genes were identified and these data were then used in Ingenuity Pathway Analysis (IPA) to predict the major canonical pathways and upstream regulators. Among the 871 differentially expressed genes screened by IPA, 466 genes were upregulated and 405 were downregulated in the weaned group. Canonical pathway analysis showed that "atherosclerosis" was the most significant pathway, and "tretinoin," a derivative of vitamin A, was predicted as the most active upstream regulator during weaning. Analyses also predicted IgG, lipopolysaccharides, and tumor-necrosis factor-α as regulators of the microbe-epithelium interaction that activates rumen-related immune responses. The functional category and the up-regulators found in this study provide a valuable resource for studying new candidate genes related to the proliferation and development of rumen papillae from suckling to weaning Japanese Black calves.
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http://dx.doi.org/10.1093/jas/skx016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6095377PMC
June 2018

Valence Band Engineering of Layered Bismuth Oxyhalides toward Stable Visible-Light Water Splitting: Madelung Site Potential Analysis.

J Am Chem Soc 2017 12 14;139(51):18725-18731. Epub 2017 Dec 14.

Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.

A layered oxychloride BiNbOCl is a visible-light responsive catalyst for water splitting, with its remarkable stability ascribed to the highly dispersive O-2p orbitals in the valence band, the origin of which, however, remains unclear. Here, we systematically investigate four series of layered bismuth oxyhalides, BiOX (X = Cl, Br, I), BiNbOX (X = Cl, Br), BiGdOX (X = Cl, Br), and SrBiOX (X = Cl, Br, I), and found that Madelung site potentials of anions capture essential features of the valence band structures of these materials. The oxide anion in fluorite-like blocks (e.g., [BiO] slab in BiNbOCl) is responsible for the upward shift of the valence band, and the degree of electrostatic destabilization changes depending on building layers and their stacking sequence. This study suggests that the Madelung analysis enables a prediction and design of the valence band structures of bismuth and other layered oxyhalides and is applicable even to a compound where DFT calculation is difficult to perform.
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http://dx.doi.org/10.1021/jacs.7b11497DOI Listing
December 2017

A conformational study of protonated noradrenaline by UV-UV and IR dip double resonance laser spectroscopy combined with an electrospray and a cold ion trap method.

Phys Chem Chem Phys 2017 May;19(17):10777-10785

Laboratory for Chemistry and Life Science, Institute of innovative research, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama, Japan.

The conformer-selected ultraviolet (UV) and infrared (IR) spectra of protonated noradrenaline were measured using an electrospray/cryogenic ion trap technique combined with photo-dissociation spectroscopy. By comparing the UV photo dissociation (UVPD) spectra with the UV-UV hole burning (HB) spectra, it was found that five conformers coexist under ultra-cold conditions. Based on the spectral features of the IR dip spectra of each conformer, two different conformations on the amine side chain were identified. Three conformers (group I) were assigned to folded and others (group II) to extended structures by comparing the observed IR spectra with the calculated ones. Observation of the significantly less-stable extended conformers strongly suggests that the extended structures are dominant in solution and are detected in the gas phase by kinetic trapping. The conformers in each group are assignable to rotamers of OH orientations in the catechol ring. By comparing the UV-UV HB spectra and the calculated Franck-Condon spectra obtained by harmonic vibrational analysis of the S state, with the aid of relative stabilization energies of each conformer in the S state, the absolute orientations of catechol OHs of the observed five conformers were successfully determined. It was found that the 0-0 transition of one folded conformer is red-shifted by about 1000 cm from the others. The significant red-shift was explained by a large contribution of the πσ* state to S in the conformer in which an oxygen atom of the meta-OH group is close to the ammonium group.
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http://dx.doi.org/10.1039/c6cp08426eDOI Listing
May 2017

Selective and low temperature transition metal intercalation in layered tellurides.

Nat Commun 2016 12 14;7:13809. Epub 2016 Dec 14.

Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.

Layered materials embrace rich intercalation reactions to accommodate high concentrations of foreign species within their structures, and find many applications spanning from energy storage, ion exchange to secondary batteries. Light alkali metals are generally most easily intercalated due to their light mass, high charge/volume ratio and in many cases strong reducing properties. An evolving area of materials chemistry, however, is to capture metals selectively, which is of technological and environmental significance but rather unexplored. Here we show that the layered telluride TPTe (T=Ti, Zr) displays exclusive insertion of transition metals (for example, Cd, Zn) as opposed to alkali cations, with tetrahedral coordination preference to tellurium. Interestingly, the intercalation reactions proceed in solid state and at surprisingly low temperatures (for example, 80 °C for cadmium in TiPTe). The current method of controlling selectivity provides opportunities in the search for new materials for various applications that used to be possible only in a liquid.
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http://dx.doi.org/10.1038/ncomms13809DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5171714PMC
December 2016

Revision of the Rhinophoridae (Diptera: Calyptratae) of Japan.

Zootaxa 2016 Aug 26;4158(1):81-92. Epub 2016 Aug 26.

Biosystematics Laboratory, Kyushu University, Motooka, Fukuoka 819-0395, JAPAN; Email: unknown.

The Japanese species of the family Rhinophoridae are revised. Melanophora roralis (Linnaeus) is newly recorded from Japan and is hypothesized as having been introduced to the country; one species, Acompomintho itoshimensis sp. nov., is described as new. Images of the habitus, wing and male terminalia are provided for all four Japanese species, together with an identification key and a map showing their distribution.
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http://dx.doi.org/10.11646/zootaxa.4158.1.4DOI Listing
August 2016

Layered Perovskite Oxychloride Bi4NbO8Cl: A Stable Visible Light Responsive Photocatalyst for Water Splitting.

J Am Chem Soc 2016 Feb 15;138(7):2082-5. Epub 2016 Feb 15.

Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.

Mixed anion compounds are expected to be a photocatalyst for visible light-induced water splitting, but the available materials have been almost limited to oxynitrides. Here, we show that an oxychrolide Bi4NbO8Cl, a single layer Sillen-Aurivillius perovskite, is a stable and efficient O2-evolving photocatalyst under visible light, enabling a Z-scheme overall water splitting by coupling with a H2-evolving photocatalyst (Rh-doped SrTiO3). It is found that the valence band maximum of Bi4NbO8Cl is unusually high owing to highly dispersive O-2p orbitals (not Cl-3p orbitals), affording the narrow band gap and possibly the stability against water oxidation. This study suggests that a family of Sillen-Aurivillius perovskite oxyhalides is a promising system to allow a versatile band level tuning for establishing efficient and stable water-splitting under visible light.
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http://dx.doi.org/10.1021/jacs.5b11191DOI Listing
February 2016

Utilization of digital differential display to identify differentially expressed genes related to rumen development.

Anim Sci J 2016 Apr 21;87(4):584-90. Epub 2015 Sep 21.

Lab of Animal Physiology, Graduate School of Agricultural Science, Tohoku University, Sendai.

This study aimed to identify the genes associated with the development of the rumen epithelium by screening for candidate genes by digital differential display (DDD) in silico. Using DDD in NCBI's UniGene database, expressed sequence tag (EST)-based gene expression profiles were analyzed in rumen, reticulum, omasum, abomasum and other tissues in cattle. One hundred and ten candidate genes with high expression in the rumen were derived from a library of all tissues. The expression levels of 11 genes in all candidate genes were analyzed in the rumen, reticulum, omasum and abomasum of nine Japanese Black male calves (5-week-old pre-weaning: n = 3; 15-week-old weaned calves: n = 6). Among the 11 genes, only 3-hydroxy-3-methylglutaryl-CoA synthase 2 (HMGCS2), aldo-keto reductase family 1, member C1-like (AKR1C1), and fatty acid binding protein 3 (FABP3) showed significant changes in the levels of gene expression in the rumen between the pre- and post-weaning of calves. These results indicate that DDD analysis in silico can be useful for screening candidate genes related to rumen development, and that the changes in expression levels of three genes in the rumen may have been caused by weaning, aging or both.
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http://dx.doi.org/10.1111/asj.12448DOI Listing
April 2016
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