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Article ; Online: Enhancement of rat spermatozoal hyperactivation by progesterone.

Miyazawa, Yuki / Fujinoki, Masakatsu

The Journal of reproduction and development

2023 Volume 69, Issue 5, Page(s) 279–290

Abstract: Progesterone (P) is a well-known enhancer of hyperactivation which is associated with the success of in vitro fertilization (IVF). In this study, we examined whether P-enhanced hyperactivation affected IVF success in rats. When rat spermatozoa were ... ...

Abstract	Progesterone (P) is a well-known enhancer of hyperactivation which is associated with the success of in vitro fertilization (IVF). In this study, we examined whether P-enhanced hyperactivation affected IVF success in rats. When rat spermatozoa were exposed to 10, 20, and 40 ng/ml P, 20 ng/ml P enhanced hyperactivation via the membrane progesterone receptor. In addition, the enhancement of hyperactivation by 20 ng/ml P was regulated by phospholipase C, transmembrane adenylate cyclase, and protein kinase A. However, 20 ng/ml P did not affect IVF success. These results suggest that 20 ng/ml P enhances rat spermatozoal hyperactivation through non-genomic pathways. Because the concentration of P changes during the estrous cycle, it seems that rat spermatozoa are hyperactivated in response to the oviductal environment. However, the effect of 20 ng/ml P does not seem to fully capacitate spermatozoa.
MeSH term(s)	Male ; Humans ; Female ; Rats ; Animals ; Progesterone/metabolism ; Sperm Capacitation ; Spermatozoa/metabolism ; Fertilization in Vitro ; Oviducts ; Sperm Motility
Chemical Substances	Progesterone (4G7DS2Q64Y)
Language	English
Publishing date	2023-09-10
Publishing country	Japan
Document type	Journal Article
ZDB-ID	2039060-9
ISSN	1348-4400 ; 0916-8818
ISSN (online)	1348-4400
ISSN	0916-8818
DOI	10.1262/jrd.2023-040
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Multi-Harmonic Modulation in a Fiber-Optic Gyroscope.

Miranda, Martin / Takei, Nobuyuki / Miyazawa, Yuki / Kozuma, Mikio

Sensors (Basel, Switzerland)

2023 Volume 23, Issue 9

Abstract: Optimizing the bias modulation of a fiber-optic gyroscope is crucial to improving its precision. In this study, we propose and demonstrate the use of multiple harmonics of sinusoidal modulation as an intermediate alternative to the widely used modulation ...

Abstract	Optimizing the bias modulation of a fiber-optic gyroscope is crucial to improving its precision. In this study, we propose and demonstrate the use of multiple harmonics of sinusoidal modulation as an intermediate alternative to the widely used modulation methods: sinusoidal and square-wave modulation. We show that this alternative integrates the advantages of each modulation method by providing a smooth modulation that produces a clean, spike-free output and a satisfactory signal-to-noise ratio. By using three harmonics of modulation in combination with a high frequency to reduce thermal phase noise, we obtained an angular random walk of 5.2(2)μdeg/h and a bias instability of ∼10μdeg/h. This is the highest performance ever reported for fiber-optic gyroscopes.
Language	English
Publishing date	2023-05-01
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s23094442
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Article ; Online: Energetically More Stable Singlet Cyclopentane-1,3-diyl Diradical with π-Single Bonding Character than the Corresponding σ-Single Bonded Compound.

Liu, Qian / Onishi, Keita / Miyazawa, Yuki / Wang, Zhe / Hatano, Sayaka / Abe, Manabu

Journal of the American Chemical Society

2023 Volume 145, Issue 49, Page(s) 27089–27094

Abstract: Carbon-carbon σ-single bonds are crucial for constructing molecules like ethane derivatives ( ... ...

Abstract	Carbon-carbon σ-single bonds are crucial for constructing molecules like ethane derivatives (R
Language	English
Publishing date	2023-11-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	3155-0
ISSN	1520-5126 ; 0002-7863
ISSN (online)	1520-5126
ISSN	0002-7863
DOI	10.1021/jacs.3c10971
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Article ; Online: Bose-Einstein Condensation of Europium.

Miyazawa, Yuki / Inoue, Ryotaro / Matsui, Hiroki / Nomura, Gyohei / Kozuma, Mikio

Physical review letters

2022 Volume 129, Issue 22, Page(s) 223401

Abstract: We report the realization of a Bose-Einstein condensate of europium atoms, which is a strongly dipolar species with unique properties, a highly symmetric [Xe]4f^{7}6s^{2} ^{8}S_{7/2} electronic ground state and a hyperfine structure. By means of ... ...

Abstract	We report the realization of a Bose-Einstein condensate of europium atoms, which is a strongly dipolar species with unique properties, a highly symmetric [Xe]4f^{7}6s^{2} ^{8}S_{7/2} electronic ground state and a hyperfine structure. By means of evaporative cooling in a crossed optical dipole trap, we produce a condensate of ^{151}Eu containing up to 5×10^{4} atoms. We estimate the scattering length of ^{151}Eu to be a_{s}=110(4) a_{B} after comparing the velocities of expansion of condensates to different orientations of the atomic magnetic moments, where a_{B} is the Bohr radius. We observe deformation of the condensate in the vicinity of the Feshbach resonance at 1.32 G with a width of 10 mG.
Language	English
Publishing date	2022-12-10
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.129.223401
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Book ; Online: Simultaneous Suppression of Thermal Phase Noise and Relative Intensity Noise in a Fiber Optic Gyroscope

Takei, Nobuyuki / Miranda, Martin / Miyazawa, Yuki / Kozuma, Mikio

2022

Abstract: The short-term sensitivity of a kilometer-long fiber-optic gyroscope is limited mainly by thermal phase noise and relative intensity noise. Increasing the phase modulation frequency decreases the thermal phase noise but not the relative intensity noise ... ...

Abstract	The short-term sensitivity of a kilometer-long fiber-optic gyroscope is limited mainly by thermal phase noise and relative intensity noise. Increasing the phase modulation frequency decreases the thermal phase noise but not the relative intensity noise since it behaves as white noise. Here, we propose and experimentally demonstrate that the angular random walk can be effectively decreased by suppressing relative intensity noise at the modulation frequency and its third-order harmonic using direct feedback to the drive current of a superluminescent diode. Our simultaneous suppression of thermal phase noise and relative intensity noise yields an angular random walk of $15\,\mu\mathrm{deg}/\sqrt{\mathrm{h}}$ and a bias instability of $33\,\mu\mathrm{deg}/\mathrm{h}$ using a fiber coil with a length of $5\,$km and an effective area of $280\,\mathrm{m^2}$ for a measurement time of 40 hours. Comment: 7 pages, 6 figures, 1 table
Keywords	Physics - Optics ; Physics - Instrumentation and Detectors
Subject code	612
Publishing date	2022-08-23
Publishing country	us
Document type	Book ; Online
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Article ; Online: Generation and Characterization of a Tetraradical Embedded in a Curved Cyclic Paraphenylene Unit.

Miyazawa, Yuki / Wang, Zhe / Hatano, Sayaka / Takagi, Ryukichi / Matsuoka, Hideto / Amamizu, Naoka / Kitagawa, Yasutaka / Kayahara, Eiichi / Yamago, Shigeru / Abe, Manabu

Chemistry (Weinheim an der Bergstrasse, Germany)

2023 Volume 29, Issue 42, Page(s) e202301009

Abstract: Unique spin-spin (magnetic) interactions, ring-size effects on ground-state spin multiplicity, and in-plane aromaticity has been found in localized 1,3-diradicals embedded in curved benzene structures such as cycloparaphenylene (CPP). In this study, we ... ...

Abstract	Unique spin-spin (magnetic) interactions, ring-size effects on ground-state spin multiplicity, and in-plane aromaticity has been found in localized 1,3-diradicals embedded in curved benzene structures such as cycloparaphenylene (CPP). In this study, we characterized the magnetic interactions in a tetraradical consisting of two localized 1,3-diradical units connected by p-quaterphenyl within a curved CPP skeleton by electron paramagnetic resonance (EPR) spectroscopy and quantum chemical calculations. Persistent triplet species with zero-field splitting parameters similar to those of a triplet 1,3-diphenylcyclopentane-1,3-diyl diradical were observed by continuous wave (CW) or pulsed X-band EPR measurements. The quintet state derived from the ferromagnetic interaction between the two triplet diradical moieties was not detected at 20 K under glassy matrix conditions. At the B3LYP/6-31G(d) level of theory, the singlet state was lower in energy than the triplet and quintet states. These findings will aid in the development of open-shell species for material science application.
Language	English
Publishing date	2023-06-16
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1478547-X
ISSN	1521-3765 ; 0947-6539
ISSN (online)	1521-3765
ISSN	0947-6539
DOI	10.1002/chem.202301009
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Article ; Online: Risk factors for post-colorectal endoscopic submucosal dissection bleeding and efficacy of carbazochrome sodium sulfonate: A multicenter retrospective cohort study.

Takahashi, Keitaro / Iwama, Takuya / Tanaka, Kazuyuki / Miyazawa, Yuki / Kuroda, Shohei / Horiuchi, Masashi / Saito, Seisuke / Muto, Momotaro / Sakatani, Aki / Ando, Katsuyoshi / Ueno, Nobuhiro / Kashima, Shin / Moriichi, Kentaro / Tanabe, Hiroki / Okumura, Toshikatsu / Fujiya, Mikihiro

Digestion

2024

Abstract: Background: Carbazochrome sodium sulfonate (CSS) is a hemostatic agent that reduces capillary permeability and enhances capillary resistance. However, its specific effects on colorectal endoscopic submucosal dissection (ESD) outcomes remain uncertain. ... ...

Abstract	Background: Carbazochrome sodium sulfonate (CSS) is a hemostatic agent that reduces capillary permeability and enhances capillary resistance. However, its specific effects on colorectal endoscopic submucosal dissection (ESD) outcomes remain uncertain. This study aimed to assess the risk factors for post-ESD bleeding and the effect of CSS on colorectal ESD outcomes. Methods: First, we retrospectively analyzed the risk factors for post-ESD bleeding using data from 1,315 lesions in 1,223 patients who underwent ESD for superficial colorectal neoplasms at eight institutions. Second, patients were divided into CSS and non-CSS groups using propensity score matching, and their outcomes from colorectal ESD were analyzed. Results: The risk factors for post-colorectal ESD bleeding were identified as age of ≥70 years, tumor located in the rectum, tumor size of ≥40 mm, and post-ESD defect unclosure in both univariate and multivariate analyses. The CSS and non-CSS groups each consisted of 423 lesions after propensity score matching. The post-colorectal ESD bleeding rate was 3.5% (15/423) and 3.3% (14/423) in the CSS and non-CSS groups, respectively, indicating no significant differences. Among patients with the high-risk factors for post-ESD bleeding, the administration of CSS also did not demonstrate a significant reduction in the post-ESD bleeding rate compared to the non-CSS group. Conclusions: CSS administration is ineffective in preventing post-colorectal ESD bleeding in both the general population and individuals at a high risk for such bleeding. Our results indicate the necessity to reconsider the application of CSS for preventing post-colorectal ESD bleeding.
Language	English
Publishing date	2024-05-18
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1712-7
ISSN	1421-9867 ; 0012-2823
ISSN (online)	1421-9867
ISSN	0012-2823
DOI	10.1159/000539367
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Article ; Online: SOMO-HOMO Conversion in Triplet Carbenes.

Murata, Ryo / Wang, Zhe / Miyazawa, Yuki / Antol, Ivana / Yamago, Shigeru / Abe, Manabu

Organic letters

2021 Volume 23, Issue 13, Page(s) 4955–4959

Abstract: In this study, the SOMO-HOMO conversion has been shown for the first time in triplet carbenes embedded in cycloparaphenylene units. The high-lying HOMO originating from the curved π-conjugated system and the low-lying SOMO-1 originating due to the small ... ...

Abstract	In this study, the SOMO-HOMO conversion has been shown for the first time in triplet carbenes embedded in cycloparaphenylene units. The high-lying HOMO originating from the curved π-conjugated system and the low-lying SOMO-1 originating due to the small carbene angle are the key to endowing this interesting electronic configuration. Furthermore, simple planar triplet carbenes such as fluorenylidene were found to possess SOMO-HOMO energy-converted electronic configurations.
Language	English
Publishing date	2021-05-28
Publishing country	United States
Document type	Journal Article
ISSN	1523-7052
ISSN (online)	1523-7052
DOI	10.1021/acs.orglett.1c01137
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Article: Synthesis of (+)-altholactone, (+)-7-epi-altholactone, (−)-etharvensin, and (+)-alumheptolide-A using Pd-catalyzed carbonylation

Miyazawa, Yuki / Hidefumi Makabe / Yasunao Hattori

Tetrahedron letters. 2018 Nov. 07, v. 59, no. 45

2018

Abstract: Syntheses of (+)-altholactone isolated from Goniothalamus giganteus and its C-7 epimer (+)-7-epi-altholactone, (−)-etharvensin and (+)-alumheptolide-A were achieved. The lactone ring of these compounds was constructed using Pd-catalyzed carbonylation. ...

Abstract	Syntheses of (+)-altholactone isolated from Goniothalamus giganteus and its C-7 epimer (+)-7-epi-altholactone, (−)-etharvensin and (+)-alumheptolide-A were achieved. The lactone ring of these compounds was constructed using Pd-catalyzed carbonylation.
Keywords	catalytic activity ; chemical reactions ; chemical structure ; Goniothalamus ; organic compounds ; palladium
Language	English
Dates of publication	2018-1107
Size	p. 4024-4027.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	204287-3
ISSN	1873-3581 ; 0040-4039
ISSN (online)	1873-3581
ISSN	0040-4039
DOI	10.1016/j.tetlet.2018.09.062
Database	NAL-Catalogue (AGRICOLA)

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Article: 1,3-Diradicals Embedded in Curved Paraphenylene Units: Singlet versus Triplet State and In-Plane Aromaticity

Miyazawa, Yuki / Wang, Zhe / Matsumoto, Misaki / Hatano, Sayaka / Antol, Ivana / Kayahara, Eiichi / Yamago, Shigeru / Abe, Manabu

Journal of the American Chemical Society. 2021 Apr. 26, v. 143, no. 19

2021

Abstract: Curved π-conjugated molecules and open-shell structures have attracted much attention from the perspective of fundamental chemistry, as well as materials science. In this study, the chemistry of 1,3-diradicals (DRs) embedded in curved cycloparaphenylene ( ...

Abstract	Curved π-conjugated molecules and open-shell structures have attracted much attention from the perspective of fundamental chemistry, as well as materials science. In this study, the chemistry of 1,3-diradicals (DRs) embedded in curved cycloparaphenylene (CPPs) structures, DR-(n+3)CPPs (n = 0–5), was investigated to understand the effects of the curvature and system size on the spin–spin interactions and singlet versus triplet state, as well as their unique characteristics such as in-plane aromaticity. A triplet ground state was predicted for the larger 1,3-diradicals, such as the seven- and eight-paraphenylene-unit-containing diradicals DR-7CPP (n = 4) and DR-8CPP (n = 5), by quantum chemical calculations. The smaller-sized diradicals DR-(n+3)CPPs (n = 0–3) were found to possess singlet ground states. Thus, the ground-state spin multiplicity is controlled by the size of the paraphenylene cycle. The size effect on the ground-state spin multiplicity was confirmed by the experimental generation of DR-6CPP in the photochemical denitrogenation of its azo-containing precursor (AZ-6CPP). Intriguingly, a unique type of in-plane aromaticity emerged in the smaller-sized singlet states such as S-DR-4CPP (n = 1), as proven by nucleus-independent chemical shift calculations (NICS) and an analysis of the anisotropy of the induced current density (ACID), which demonstrate that homoconjugation between the 1,3-diradical moiety arises because of the curved and distorted bonding system.
Keywords	anisotropy ; cycloparaphenylenes ; moieties ; photochemistry ; quantum mechanics
Language	English
Dates of publication	2021-0426
Size	p. 7426-7439.
Publishing place	American Chemical Society
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	3155-0
ISSN	1520-5126 ; 0002-7863
ISSN (online)	1520-5126
ISSN	0002-7863
DOI	10.1021/jacs.1c01329
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