Search Results 1-20 of 236

  • Relationship between Occupational Preference / Aversion and Objective Status: Three Analytical Models are Examined  [in Japanese]

    林 拓也

    … First, "consensus" model is that people prefer to higher status and/or averse to lower status regardless of their objective status. … Second, "level discrepancy" model is that people's preference and/or aversion compared to their objective status are observed and that they prefer to upward mobility and/or averse to downward mobility regardless of their status. …

    奈良女子大学社会学論集 (27), 18-35, 2020-03-01

    IR 

  • Inhibitory effects of long-term repeated treatments of a sustainable GnRH antagonist, degarelix acetate, on caprine testicular functions

    KAWATE Noritoshi , KANUKI Ryota , HANNAN M. A. , WEERAKOON Weerakoon W. P. N.

    … We investigated the effects of long-term repeated treatments with a sustainable gonadotropin-releasing hormone (GnRH) antagonist, degarelix acetate, on testicular hormonal secretion, size, ultrasound images, histology and spermatogenesis in goats to assess its efficacy as a chemical castration method. … Male Shiba goats (3–6 months of age) were treated subcutaneously with degarelix acetate every 4 weeks for 24 weeks. …

    Journal of Reproduction and Development 66(6), 587-592, 2020

    J-STAGE 

  • Mathematical analysis for an age-structured SIRS epidemic model

    Okuwa Kento , Inaba Hisashi , Kuniya Toshikazu

    … In this paper, we investigate an SIRS epidemic model with chronological age structure in a demographic steady state. … Although the age-structured SIRS model is a simple extension of the well-known age-structured SIR epidemic model, we have to develop new technique to deal with problems due to the reversion of susceptibility for recovered individuals. …

    Mathematical Biosciences and Engineering 16(5), 6071-6102, 2019-07-02

    IR 

  • Early production of offspring by <i>in vitro</i> fertilization using first-wave spermatozoa from prepubertal male mice

    MOCHIDA Keiji , HASEGAWA Ayumi , OGONUKI Narumi , INOUE Kimiko , OGURA Atsuo

    … Here, we sought to determine the earliest age at which male mice (C57BL/6J strain) can be used efficiently for producing offspring via IVF. … Because we noted that the addition of reduced glutathione (GSH) to the IVF medium significantly increased the fertilizing ability of spermatozoa from prepubertal males, we used this IVF protocol for all experiments. … Spermatozoa first reached the caudal region of the epididymides at day 35; …

    Journal of Reproduction and Development 65(5), 467-473, 2019

    J-STAGE  Ichushi Web 

  • Evaluation of the Impact of Light Source on Reproductive Parameters in Laying Hens Housed in Individual Cages

    Baxter Mikayla , Bédécarrats Grégoy Y.

    … <p>Higher light wavelengths have been shown to stimulate extra-retinal photoreceptors more efficiently than lower wavelengths to promote reproduction in poultry. … We developed a light emitting diode (LED) bulb that emits 60% of its light in the red spectrum (LED-R), and evaluated the effects of different light sources on growth and reproduction in commercial layer hens. …

    The Journal of Poultry Science 56(2), 148-158, 2019

    J-STAGE 

  • Long-term dietary intake of excessive vitamin A impairs spermatogenesis in mice

    Yokota Satoshi , Shirahata Takuya , Yusa Junko , Sakurai Yuko , Ito Hiroshi , Oshio Shigeru

    … <p>Vitamin A and its derivatives contribute to many physiological processes, including vision, neural differentiation, and reproduction. … Vitamin A deficiency causes early cessation of spermatogenesis, characterized by a marked depletion of germ cells. … However, there has been no clear understanding about the role of chronic intake of vitamin A excess (VAE) in spermatogenesis. …

    The Journal of Toxicological Sciences 44(4), 257-271, 2019

    J-STAGE  Ichushi Web 

  • The Life-history Evolution of Plants and Its Relevance to Climate  [in Japanese]

    KENTA Tanaka

    … <p> To obtain insights into the relevance of climate and environment for life-history evolution, the following are reviewed: 1) life-history classification derived from <i>r–K</i> …

    Journal of Geography (Chigaku Zasshi) 128(1), 147-154, 2019

    J-STAGE 

  • An age-structured epidemic model for the demographic transition (Theory of Biomathematics and Its Applications XIV : Modelling and Analysis for Structured Population Dynamics and its Applications)

    Inaba Hisashi

    … In this paper, we formulate an age-structured epidemic model for the demographic transition in which we assume that the cultural norms leading to lower fertility are transmitted amongst individuals in the same way as infectious diseases. … First, we formulate the basic model as an abstract homogeneous Cauchy problem on a Banach space to prove the existence, uniqueness, and well-posedness of solutions. …

    数理解析研究所講究録 (2087), 51-60, 2018-08

    IR 

  • Global behavior of SIS epidemic models with age structure and spatial heterogeneity

    Kuniya Toshikazu , Inaba Hisashi , Yang Junyuan

    … In this study, we investigate two kinds of SIS epidemic models with an age structure and spatial heterogeneity. … The first is the SIS epidemic model with age and patch structures, and the second is the SIS epidemic model with age structure and spatial diffusion. …

    Japan Journal of Industrial and Applied Mathematics 35(2), 669-706, 2018-07

    IR 

  • Effect of vitamin B<SUB>12</SUB> on resilience to turbidity stress for <I>Moina macrocopa</I>

    Nadia Istiqomah , Novi Arisman , Yoshimatsu Takao

    近年，集中豪雨の増加による水圏生物に対する濁水の影響が懸念されている。本研究では，通常バクテリアによって水圏に富化されるビタミン B<SUB>12</SUB> が動物プランクトンの環境変化に対する耐性にどのように影響を与えるかについて，様々なビタミン B<SUB>12</SUB> 濃度（0, 5, 25 µg/<I>l</I> …

    Aquaculture Science 66(4), 275-285, 2018

    J-STAGE  JASI 

  • Relationship between menarche and fertility in long-tailed macaques (<i>Macaca fascicularis</i>)

    KOBAYASHI Maiko , KOYAMA Takamasa , YASUTOMI Yasuhiro , SANKAI Tadashi

    … We attempted to elucidate female reproduction in long-tailed macaques (<i>Macaca fascicularis</i>). … We analyzed individual breeding data including time of menarche, start of regular menstruation, and first pregnancy. … These three events are related to the maturation of female long-tailed macaques. …

    Journal of Reproduction and Development 64(4), 337-342, 2018

    J-STAGE  Ichushi Web 

  • Characteristics of reproduction in sika deer (<i>Cervus nippon</i>) under high population density in Hyogo Prefecture, Japan  [in Japanese]

    Tsuji Matsukane Tomoka , Yokoyama Mayumi

    <p>シカ類の個体群動態は生息密度の影響を受けることが報告されており，個体数管理において，繁殖特性を把握し密度依存的変化を明らかにすることは重要である．しかし開放個体群では，密度変化とともに繁殖状況の変化を追跡した事例は極めて少ない．</p><p>本研究では，兵庫県におけるニホンジカ（<i>Cervus nippon</i>）個体群の年齢 …

    Honyurui Kagaku (Mammalian Science) 58(1), 13-21, 2018

    J-STAGE 

  • Waking Up from May '68 and the Repressive Hangover : Stages of Critique Past Althusser and Foucault

    Harcourt Bernard E.

    … : Foucault/Althusser after May '68 (March 19, 2016)Following the May '68 student and worker uprisings in Paris, Foucault and Althusser reworked their analyses of power in order to take account of the social and political forces that had effectively squelched the revolutionary moment. … At first, they organized their analyses around the notion of repression; …

    ZINBUN (47), 13-32, 2017-03

    IR  DOI 

  • Positive correlations of age and parity with plasma anti-Müllerian hormone concentrations in Japanese Black cows

    KOIZUMI Motoya , KADOKAWA Hiroya

    … This study examined how age, parity, and time after parturition affect plasma AMH concentrations in Japanese Black cows. … We measured plasma AMH concentrations in primiparous, secundiparous, and multiparous (third parity or higher) cows at four time points: day 2 (day 0 = parturition), day 8, 2 days before first postpartum ovulation (pre-1stOv), and 12 days after first ovulation (post-1stOV). …

    Journal of Reproduction and Development 63(2), 205-209, 2017

    J-STAGE 

  • Meta-analysis for effects of breed and climatic zone in reproduction traits of pig  [in Japanese]

    ARIMASU Shouko , OIKAWA Takuro

    <p>本研究は，ブタの繁殖形質に関するメタ分析により品種と気候帯の効果およびそれらの交互作用について明らかにすることを目的に行った．データには205論文の2097件の形質平均値を使用した．試験地をケッペンの気候区分に従い温帯，熱帯，亜寒帯に分類した．分析対象形質は，生存産子数，離乳産子数，離乳時平均体重，離乳時一腹体重，分娩率，分娩間隔などの12形質である．分析には統計ソフトウェアSA …

    Nihon Chikusan Gakkaiho 88(3), 269-280, 2017

    J-STAGE  JASI 

  • A MULTI-GROUP SIR EPIDEMIC MODEL WITH AGE STRUCTURE

    Kuniya Toshikazu , Wang Jinliang , Inaba Hisashi

    … This paper provides the first detailed analysis of a multi-group SIR epidemic model with age structure, which is given by a nonlinear system of 3n partial differential equations. … The basic reproduction number R-0 is obtained as the spectral radius of the next generation operator, and it is shown that if R-0 < …

    Discrete and Continuous Dynamical Systems-Series B 21(10), 3515-3550, 2016-12

    IR 

  • Disrupting the circadian photo-period alters the release of follicle-stimulating hormone, luteinizing hormone, progesterone, and estradiol in maternal and fetal sheep

    GAO Qinqin , LV Juanxiu , LI Weisheng , ZHANG Pengjie , TAO Jianying , XU Zhice

    … Although a large number of studies show that photo-period disruption potentially affects hormone secretion in mammals, information about the effects of circadian photo-period disruption during pregnancy on fetal blood reproductive hormone levels is scarce. …

    Journal of Reproduction and Development 62(5), 487-493, 2016

    J-STAGE  Ichushi Web 

  • The effect of leptin gene polymorphisms on fertility traits in Japanese Black cattle  [in Japanese]

    KAWAGUCHI Fuki , FUKAZAWA Kenji , KOHAMA Namiko , AKIYAMA Takayuki , FUKUSHIMA Moriyuki , KOBAYASHI Eiji , OYAMA Kenji , MANNEN Hideyuki , SASAZAKI Shinji

    <p>本研究では，兵庫県黒毛和種繁殖雌牛集団409個体を供試してレプチン遺伝子内多型の繁殖形質に対する効果を調査した．409頭から16頭を選抜しレプチン遺伝子全翻訳領域の塩基配列決定により多型探索を行った結果，Y7F, R25C, A80Vの3つのアミノ酸置換が同定された．これらについて409頭の遺伝子型判定を行い，統計解析により各多型の繁殖形質に対する効果を調査した．分散分析の結果， …

    Nihon Chikusan Gakkaiho 87(4), 333-338, 2016

    J-STAGE  JASI 

  • Positive correlations of age and parity with plasma concentration of macrophage migration inhibitory factor in Japanese black cows

    KOIZUMI Motoya , NAHAR Asrafun , YAMABE Ryusei , KADOKAWA Hiroya

    … Plasma Macrophage migration inhibitory factor (MIF) concentration correlates positively with age, and negatively with self-rated health in women, and optimal MIF concentration may promote proper reproductive function. … This study was conducted to evaluate the hypotheses that plasma MIF concentration changes with parturition or postpartum first ovulation, and that age in months and parity correlate with plasma MIF concentration in Japanese black cows. …

    Journal of Reproduction and Development 62(3), 257-263, 2016

    J-STAGE  Ichushi Web 

  • Outline of the Japan Environment and Children's Study and the Framework of Genome Analysis  [in Japanese]

    NITTA Hiroshi

    … The goal of the Japan Environment and Children's Study (JECS) is to improve the health and welfare of children and to contribute to better risk management of chemical substances in the environment. … The study will examine hypotheses related to reproduction, congenital anomalies, neuropsychiatric development, immunity, metabolism and endocrine system. …

    Nippon Eiseigaku Zasshi (Japanese Journal of Hygiene) 71(1), 91-93, 2016

    J-STAGE  Ichushi Web 

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