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Articles by Y. Yamada
Total Records ( 4 ) for Y. Yamada
  T Kitamura , M Ogawa and Y. Yamada

We examined the effects of U50,488, a kappa-opioid receptor agonist, and flurbiprofen axetil, a nonsteroidal antiinflammatory drug, in a visceral pain model using conscious rats. U50,488 produced visceral antinociception, but exaggerated the adverse effects on the central nervous system (CNS) at 0.9 mg/kg or more. Naloxone completely antagonized these effects. Flurbiprofen axetil produced visceral antinociception, but exaggerated the adverse effects on the CNS at 80 mg/kg. Coadministration of U50,488 (0.27 mg/kg) and flurbiprofen axetil (50 mg/kg) produced intense visceral antinociception without adverse effects on the CNS, implying therapeutic efficacies of coadministration of kappa-opioid receptor-agonists and nonsteroidal antiinflammatory drugs on visceral pain.

  T. Narita , Y. Katsuura , T. Sato , M. Hosoba , H. Fujita , T. Morii and Y. Yamada
  Not available
  M. Hiramatsu , M. Oguri , K. Kato , T. Yoshida , T. Fujimaki , H. Horibe , K. Yokoi , S. Watanabe , K. Satoh , Y. Aoyagi , M. Tanaka , H. Yoshida , S. Shinkai , Y. Nozawa , T. Murohara and Y. Yamada
  Aims  We previously showed that the C[RIGHTWARDS ARROW]T polymorphism (rs6929846) of BTN2A1 was significantly associated with myocardial infarction in Japanese individuals by a genome-wide association study. Given that diabetes mellitus is an important risk factor for myocardial infarction, the association of rs6929846 of BTN2A1 with myocardial infarction might be attributable, at least in part, to its effect on susceptibility to diabetes. The purpose of this study was to examine the relation of rs6929846 of BTN2A1 to Type 2 diabetes mellitus.

Methods  A total of 8650 Japanese individuals from two independent subject panels were examined: Panel A comprised 1141 individuals with Type 2 diabetes and 3161 control subjects and panel B comprised 1664 individuals with Type 2 diabetes and 2684 control subjects.

Results  The chi-square test revealed that rs6929846 of BTN2A1 was significantly related to the prevalence of Type 2 diabetes in subject panel A (P = 0.0002) and subject panel B (P = 0.006). Multivariable logistic regression analysis with adjustment for age, sex, body mass index and smoking status revealed that rs6929846 was significantly associated with Type 2 diabetes (P = 0.0006; odds ratio 1.25) in all individuals, with the T allele representing a risk factor for this condition. Multiple regression analysis with adjustment for age, sex and body mass index revealed that rs6929846 was significantly (P = 0.04) related to blood glycosylated haemoglobin content in control subjects.

Conclusions BTN2A1 may be a susceptibility gene for Type 2 diabetes in Japanese individuals.

  M.M. Rahman , S. Kadowaki , S.M. Linn and Y. Yamada
  Recirculating aquaculture systems can reduce many challenges associated with open culture systems but maintaining suitable water quality in recirculating system is difficult. Protein skimmer removes organic matter from the water before it breaks down into nitrogenous waste. Therefore, the aim of this study was to evaluate the effects of protein skimming on water quality, bacterial abundance and abalone growth in recirculating aquaculture system. Two recirculating systems utilizing artificial seawater were housed in an air-conditioned, insulated recycle frozen container (4.3x1.9x1.9 m) to maintain optimum water temperature (19.2±0.8°C) for abalone growth. Each system consisted of two biofilters (100 and 200 L) and two abalone culture tanks (each 200 L) containing three plastic baskets (each 50x34x6 cm, with 12 mm mesh). One culture system incorporated a protein skimmer. Over an experimental period of 87 days, protein skimming resulted in significantly better water quality, heterotrophic bacterial abundance and abalone growth. Results indicate recirculating abalone culture systems with protein skimmer housed in an air-conditioned, insulated recycle frozen container may provide a viable alternative to current land-based, flow-through systems. More research is needed to further increase the efficiency of this system.
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