13 research outputs found

    Sexual Behaviour of Kiso Horses under Natural Mating

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    放牧地における自然交配時の木曾馬の性行動のパターン・回数および複数の牝馬が発情している時の性行動について調べた。その結果、乗駕回数が最も多い時間帯は14:00~16:30、射精の多い時間帯は11:00~14:00であった。種牡馬が発情牝馬に対して、求愛→ペニスの勃起→乗駕→ペニスの挿入→射精の完全な性行動を示したものは約11%にすぎず、他はかなり変則的であった。特に求愛行動なしに乗駕・射精に至る例が19%も存在した。一方、複数の牝馬が発情している場合、種牡馬はランダムに求愛、乗駕行動を示した。また、82回の乗駕行動のうち、種牡馬の一連の性行動が途中で中断し、直ちに別の発情中の牝馬を相手に性行動を始め乗駕する場合が13例みられた。The present investigation was carried out on the patterns and its frequency of sexual behaviour in Kiso stallion under natural mating. Most mounting behaviour occurred from 14:00 to 16:30, and most ejaculation behaviour occurred from 11:00 to 14:00 (Fig. 7). The stallion exhibits distinct phases to estrus mare : courtship, erection and mounting, intromissin and ejaculation. But, the perfectry sexal behaviour in stallion was only 11%, the other was irregular sexual behaviour. Specially, the most irregular sexual behaviour which the stallion mounts to estrous mare; brought in the wake of intromission and ejaculation without courtship behaviour was existence 19% (Table 2). When the plural mares are behavioral signs of estrous, the stallion exhibits at randam courtship and mounting to estrous mares. The stallion breaked on the part of the way internuption behaviour on the first estrous mare, at once he began the sexual behaviour to other mare. These cases existed thirteen-eighty seconds. (Table 3.4).Article信州大学農学部紀要 22(2): 91-98(1985)departmental bulletin pape

    食品因子による生体防御を目的としたDNA傷害マ-カ-の開発と応用

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    最近、がんの発生におけるフリーラジカルの役割については多くの注目を集めてきているが科学的な根拠については未知の点も多い。特に、防御機構が正常に機能しない状態に陥ったときに生体内では過剰な活性酸素が生成し、フリーラジカル連鎖反応が誘発される。その結果、生体膜での傷害や生体重要物質での損傷にもとずく機能傷害の蓄積と共に遺伝子レベルにおける傷害が「遺伝毒性」を発現し、「がんの発生」を誘発したり「がん化の促進」に大きな役割をはたしているのではないかと考えられてきている。このような遺伝子レベルにおける酸化的傷害を抑制すること、特に食品成分が抑制因子となりうるかについてを評価するために、老化に関連した疾病のマーカーとして酸化修飾塩基の代表である8-デオキシグアノシンのモノクローナル抗体による検出法の応用を日本老化制御研究所 (越智)との共同研究で開発することができた。そこで本年度は、まず、ゴマ種子中に大量に含まれている新規な抗酸化前駆体であるリグナン配糖体の持つ酸化傷害予防効果の検討を行った。方法は、ゴマ脱脂粕をビタミンE欠乏飼料中に10%加えてラットに2ケ月間投与し、四塩化炭素で過酸化傷害を与えた。その結果、ビタミンE欠乏食だけの場合に較べてゴマ脱脂粕の場合は肝臓や血液中の過酸化度と共に尿中での過酸化度、さらに8-デオキシグアノシン量を有意に低下させた。これらの結果より、セサミノール配糖体が腸内細菌により加水分解を受けた後に生体内に吸収され抗酸化的な防御効果を示すという新しい機構を提出することができた。また、本年は、生体膜の酸化的傷害物質として代表的な4-ヒドロキシノネナールのモノクロナール抗体の作製に成功し、さらに最近マロンジアルデヒドにより修飾されたタンパク質に対するポリクローナル抗体の作製にも成功している。これらの抗体による組織染色、特に酸化傷害により生じた腎臓がん部位での検出への応用にも成功している。さらに、培養細胞系、特に、チャイニーズハムスターや大腸由来の細胞で過酸化水素を中心とした酸化的傷害の保護効果についても、新しい機構を提出することができた。また、ゴマ油中の抗酸化成分として抗酸化的な防御効果の検討を行ったセサミノールについては、ビタミンEに対して強い相乗的な効果が見られるという新しいメカニズムを明らかにすることができたので、これらのリグナンを食品因子として代謝も含めた新しい研究へのアプロ-チが期待される。科学研究費補助金 研究種目:試験研究(B) 課題番号:05556021 研究代表者:大澤 俊彦 研究期間:1993-1995年度research repor

    Observation of the ηc(2S) in Exclusive B→KKSK-π+ Decays

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    Concrete Durability Assessment for Scaling by Reliability Theory

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    application/pdfThe proper prediction of concrete deterioration is important for estimating and evaluating the service life of concrete structures and for maintaining and managing them. It is necessary to establish the limit of deterioration in management (the deterioration limit) and understand the probability of exceeding that limit. In this study, the introduction of reliability theory to predict and evaluate concrete deterioration was tried in order to determine if it could be used for these purposes, predicting surface scaling, which is a typical form of surface deterioration of concrete structures located in cold regions and an important factor in the maintenance of the beauty of value-added concrete structures, and the deterioration of cover concrete of steel.departmental bulletin pape

    Synergistic activity of troxacitabine (Troxatyl™) and gemcitabine in pancreatic cancer-3

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    <p><b>Copyright information:</b></p><p>Taken from "Synergistic activity of troxacitabine (Troxatyl™) and gemcitabine in pancreatic cancer"</p><p>http://www.biomedcentral.com/1471-2407/7/121</p><p>BMC Cancer 2007;7():121-121.</p><p>Published online 3 Jul 2007</p><p>PMCID:PMC1948004.</p><p></p>xacitabine or gemcitabine either alone or in combination at a ratio of 1:100 of gemcitabine vs. troxacitabine, for 72 h, after which cells were harvested by trypsinization and their numbers determined using electronic particle counting. Each data point represents the mean ± SD of three determinations. Gemcitabine (open squares), troxacitabine (open inverted triangle), gemcitabine + troxacitabine (open circle). The GIvalues for exposures to troxacitabine and gemcitabine alone are given in Table 2

    Discovery of 4-Aryl-4<i>H</i>-chromenes as a New Series of Apoptosis Inducers Using a Cell- and Caspase-Based High-Throughput Screening Assay. 3. Structure−Activity Relationships of Fused Rings at the 7,8-Positions

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    As a continuation of our efforts to discover and develop the apoptosis-inducing 4-aryl-4H-chromenes as novel anticancer agents, we explored the SAR of fused rings at the 7,8-positions. It was found that a five-member aromatic ring, such as pyrrolo with nitrogen at either the 7- or 9-position, is preferred. A six-member aromatic ring, such as benzo or pyrido, also led to potent compounds. The SAR of the 4-aryl group was found to be similar for chromenes with a fused ring at the 7,8-positions. These compounds were found to inhibit tubulin polymerization, indicating that cyclization of the 7,8-positions into a ring does not change the mechanism of action. Compound 2h was identified to be a highly potent apoptosis inducer with an EC50 of 5 nM and a highly potent inhibitor of cell proliferation with a GI50 of 8 nM in T47D cells

    Synergistic activity of troxacitabine (Troxatyl™) and gemcitabine in pancreatic cancer-1

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    <p><b>Copyright information:</b></p><p>Taken from "Synergistic activity of troxacitabine (Troxatyl™) and gemcitabine in pancreatic cancer"</p><p>http://www.biomedcentral.com/1471-2407/7/121</p><p>BMC Cancer 2007;7():121-121.</p><p>Published online 3 Jul 2007</p><p>PMCID:PMC1948004.</p><p></p>aCa-2, AsPc-1 and Capan-2 cells. The individual doses of gemcitabine and troxacitabine to achieve 90% (straight line) growth inhibition (Fa = 0.90), 75% (hyphenated line) growth inhibition (Fa = 0.75), and 50% (dotted line) growth inhibition (Fa = 0.50) were plotted on the x- and y-axes. Combination index (CI) values calculated using Calcusyn software is represented by points above (indicate antagonism between drugs) or below the lines (indicate synergy). (X symbol) ED(plus sign) EDand (open dotted circle ) ED

    Synergistic activity of troxacitabine (Troxatyl™) and gemcitabine in pancreatic cancer-0

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    <p><b>Copyright information:</b></p><p>Taken from "Synergistic activity of troxacitabine (Troxatyl™) and gemcitabine in pancreatic cancer"</p><p>http://www.biomedcentral.com/1471-2407/7/121</p><p>BMC Cancer 2007;7():121-121.</p><p>Published online 3 Jul 2007</p><p>PMCID:PMC1948004.</p><p></p>xacitabine or gemcitabine either alone or in combination at a ratio of 1:100 of gemcitabine vs. troxacitabine, for 72 h, after which cells were harvested by trypsinization and their numbers determined using electronic particle counting. Each data point represents the mean ± SD of three determinations. Gemcitabine (open squares), troxacitabine (open inverted triangle), gemcitabine + troxacitabine (open circle). The GIvalues for exposures to troxacitabine and gemcitabine alone are given in Table 2
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