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N Kawabata

Publications and source records attributed to N Kawabata.

At least 55 records · Page 3Linked to original sources

Visual information processing at the blind spot.

The perceptual completion at the blind spot was studied by presenting test patterns around the blind area of 3 subjects with normal acuity, and conditions generating the perceptual completion were investigated. To be filled in, a stimulus must fall on at least two quadrants around the blind spot. Both a region between 3.0 and 3.9 degrees in radii around the blind spot, which can generate white homogeneous completion, and the region between 4.3 and 5.2 degrees, which can not generate any completion solely, play important parts in provoking completion. Periodic stimuli were more effective than non-periodic ones.

Humans↗

Studies on the sulfite reduction test for clostridia.

Peptone-yeast extract (PY) medium containing 0.035% ferric ammonium citrate as an indicator, 0.05% sulfite as a substrate, 0.05% cysteine as a reducer and 0.5% glucose was found to be suitable for observing the sulfite reduction test. The effect of added cysteine on the test was suppressed by the addition of glucose. In cultures of bacteria grown for 2 days at 37 C in medium containing the above ingredients, 121 among 132 strains of clostridia, including 86 strains of Clostridium perfringens, gave a positive reaction. Although some strains of Salmonella and Proteus were positive, the specificity of the test for clostridia was thought to be relatively high. Positive reactions in a resting cell system were limited to some species of clostridia.

Bacteriological Techniques↗

[A study on serum level and urinary excretion of fosfomycin-Na in man with special reference to pharmacokinetic analysis (author's transl)].

FOM-Na was investigated on its distribution after a continuous intravenous drip infusion in 3 healthy adult volunteers, and its serum levels and urinary excretion were pharmacokinetically analyzed, while the excreted substance into urine was also analyzed with GC/MS. The results obtained are summarized as follows: 1. The distribution volume of FOM-Na in one-compartment open model was 0.183 L/kg, half life in human body 1.66 hours and renal clearance 0.0737 L/hr/kg. 2. With these pharmacokinetic constants, the mean values following various doses demonstrated almost equal irrespective of its dosage schedule, keeping an almost constant level in each individual tested. 3. The area under serum level-time curve was approximately 216 microgram.hr/ml per 1 g (potency), and increased in proportion to an infused dose within the range of 1 approximately 6 g (potency). Three consecutive administrations showed no trend of accumulation of the agent in the serum. 4. Urinary excretion of the agent was found to be very fast, and its recovery rate from urine within 10 approximately 11 hours after the completion of an i. v. drip infusion was approximately 95 approximately 99%. 5. As a result of GC/MS on the substance excreted into urine, it was noted that FOM-Na was not metabolized in human body and excreted into urine in its original form. 6. There was seen no specific change in electrocardiogram during and/or after an intravenous drip infusion in 1 hour of 2 g (potency) FOM-Na dissolved in a 300 ml 5% glucose solution.

Adult↗