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Successor
Volume 25 (1972)
- Issue 6 Pages 355-
- Issue 5 Pages 291-
- Issue 4 Pages 249-
- Issue 3 Pages 133-
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Predecessor
Volume 25, Issue 6
Displaying 1-4 of 4 articles from this issue
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NOBUTAKE SATO, HIROYASU SATO, RINJI KAWANA, MINORU MATUMOTO1972 Volume 25 Issue 6 Pages 355-368
Published: 1972
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSNeutralizing antibody titers of 252 random serum samples from different age groups were determined by the microplate method. The results showed marked differences in the grade and pattern of dissemination among the serotypes. Echo-22 (Group I) showed extremely high endemicity with an infection rate higher than 50% among infants within the first year of life. Cox B-1, 3, and 4 and Echo-9, 11, 14, 21, 25, and 31 (Group II) were highly endemic with occasional outbreaks. Cox B-2 and Echo-3, 4, 6, 12, 13, 15, 16, 19, 20, 26, and 29 (Group III) showed relatively low endemicity with extensive dissemination at relatively long intervals. Cox B-5 and Echo-7 (Group IV) gave unique antibody-incidence curves with a sharp peak at a certain age, which was explained by extensive spread of virus in a certain year after many quiescent years and a strong age preference of primary infection for young children. Echo-2, 17, 18, 24, 30, and 33 (Group V) maintained low endemicity with no extensive dissemination. Cox B-6 and Echo-1, 5, 27, and 32 (Group VI) showed the lowest endemicity. Long communicable periods of the infected host seem to be a decisive factor for Groups I and II to maintain the high endemicity, and the possibility of intrauterine or neonatal infection was suggested for Echo-22 in particular. The chronic carrier state was suggested for the very low endemic serotypes to secure continuous transmission.View full abstractDownload PDF (1399K) -
TETSUYA OHTAKI, MASAKAZU TAKAHASHI1972 Volume 25 Issue 6 Pages 369-376
Published: 1972
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSLarvae of Sarcophaga peregrina entered pupal diapause under a certain short day condition through embryonic stage to mature larvae. The critical day length for 50% induction of pupal diapause was 13 L : 11D cycles at 22C, but the effect of the short day was enfeebled by higher temperature. In order to break the diapause, pupae had to be exposed to low temperature for 8 weeks or more, though spontaneous termination of diapause occurred by placing the pupae for a longer term at 25C.
Eddysone contents of the whole body varied with their developmental stage from the mature larvae to pupae. In both diapause and nondiapause pupa, the ecdysone titer began to increase after transferred to dry condition and reached a maximum 12 hr after pupariation. About 40 hr after pupariation, the ecdysone titer decreased to minimum values. Afterwards, only in non-diapause pupae, the titer began to increase again at the time of larval-pupal ecdysis. The second peak of ecdysone titer is thought to be responsible for adult development, since the peak was not seen in diapause pupae.View full abstractDownload PDF (741K) -
TETSURO KATAOKA, REIKO M. NAKAMURA, SABURO YAMAMOTO, TOORU TOKUNAGA, T ...1972 Volume 25 Issue 6 Pages 377-382
Published: 1972
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (4002K) -
1972 Volume 25 Issue 6 Pages e1
Published: 1972
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (21K)
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