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351.
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Michiya Matsuyama Shinji Adachi Yoshitaka Nagahama Chikara Kitajima Shuhei Matsuura 《Ichthyological Research》1991,37(4):381-390
Gonad and blood samples were taken throughout the year from captive males of the Japanese sardine,Sardinops melanostictus, and changes in serum levels of gonadal steroids were examined in relation to the annual gonadal cycle. On the basis of testicular
histology, the annual gonadal cycle was divisible into four periods: immature (July–September), spermatogenesis (October–December),
spermiation (January–April), and post-spawning (May–June). The pattern of seasonal changes in the gonadosomatic index (GSI)
was inversely correlated with that of water temperature, and reflected the degree of testicular maturity. The serum testosterone
level was relatively low during spermatogenesis (2.2–2.5 ng/ml), rose markedly around the time of spermiation (7.7–24.6 ng/ml),
and became low after spawning and during immature periods (0.6–0.7 ng/ml). The serum 17α,20β-dihydroxy-4-pregnen-3-one level
was high in males with spermatogenic or spermiating testes (0.6–1.0 ng/ml), but became low (0.2 ng/ ml during the post-spawning
period and was undetectable in immature fish. Although 11-ketotestosterone was detectable in some fish, the values obtained
were thought to reflect cross-reactivity of the antiserum employed with testosterone. These findings are discussed in relation
to male reproduction of the Japanese sardine and steroidal regulation of spermatogenesis and spermiation in other teleosts. 相似文献
353.
Fumiaki Tabuchi Aroonlug Lulitanond Viraphong Lulitanond Sudaluck Thunyaharn Chikara Kaito 《Microbiology and immunology》2020,64(3):219-225
In this present study, we investigated the phenol-soluble modulin (psm-mec) mutations, the staphylococcal cassette chromosome mec (SCCmec) types, and toxin production in 102 methicillin-resistant Staphylococcus aureus (MRSA) isolates from the northeast and central regions of Thailand. The MRSA isolates carrying -7T>C psm-mec in Type II SCCmec (n = 18) and the MRSA isolates carrying no psm-mec in Type IV (n = 8) or Type IX SCCmec (n = 4) had higher hemolytic activity against sheep erythrocytes than MRSA isolates carrying intact psm-mec in Type III SCCmec (n = 34), but MRSA isolates carrying no psm-mec in Type I SCCmec (n = 27) did not. 相似文献
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