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미량 Cr 및 Ti 를 함유하는 Al-Mg-Si 합금의 용질편석과 석출조직
최정철,수총유강,신미창언,고교항부,류성곤 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.5
In Al-1.1wt%Mg-0.68wt%Si alloy the effect of Cr and Ti additions on precipitation behavior of the homogenized and/or aged specimens has been investigated homogenizing. Ephase(Al, Mg, Cr₂) is preferentially precipitated around Mg₂Si and distributed unevenly near a cored dendrite structure. With the addition of Cr and Ti the aged microstructure has indicated that the coarsening of needle-shaped G. P. zone and rod-shaped intermediate phase(β') is delayed, and transition from needle-shaped G. P. zone to β' phase is, thus, delayed. This in turn, caused deceleration of the hardness decrease rate during overaging.
Yoshimura Hideto,Tabuchi Ken,Uesugi Ryuji,Takahashi Akihiko 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1
To understand the geographical differences between diapause systems and synchronization of adult occurrence in the soybean pod borer Leguminivora glycinivorella (Lepidoptera: Tortricidae), we examined the timing of winter diapause termination and intensity of summer diapause using univoltine and potentially bivoltine individuals in Iwate, Japan. In laboratory rearing experiments of mature larvae maintained at constant temperature (20 ◦ C), winter diapause intensity weakened by January without photoperiodic responses. Meanwhile, summer diapause was maintained by the long day length and presumably terminated with the photoperiodic transition from long to short day length. The intensity of summer diapause was stronger for cocoons that transitioned from a 16 h light to 8 h dark (LD 16:8) to a LD 15:9 photoperiod than for those that transitioned from LD 15:9 to LD 14:10. These results suggest that populations distributed in relatively low-latitude areas, with partly or potentially bivoltine individuals, would have a weaker summer diapause or none at all. Moreover, sexual differences in the number of days to emergence were not detected when individuals experienced a photoperiodic transition from long to short day length, suggesting that the summer diapause system may function to synchronize the emer gence of males and females in the population examined.
OHTANI, Yoshihisa,YONEZAWA, Tomo,SONG, Sang‐,Houn,TAKAHASHI, Tatsuyuki,ARDIYANTI, Astrid,SATO, Katsuyoshi,HAGINO, Akihiko,ROH, Sang‐,gun,KATOH, Kazuo Blackwell Publishing Asia 2011 Animal science journal Vol.82 No.1
<P><B>ABSTRACT</B></P><P>Although the functions of adiponectin, a differentiated adipocyte‐derived hormone, in regulating glucose and fatty acid metabolism are regulated by two subtypes of adiponectin receptors (AdipoRs; AdipoR1 and AdipoR2), those in ruminants remain unclear. Therefore we examined the messenger RNA (mRNA) expression levels of adiponectin and its receptors in various bovine tissues and mammary glands among different lactation stages, and the effects of lactogenic hormones (insulin, dexamethasone and prolactin) and growth hormone (GH) on mRNA expression of the AdipoRs in cultured bovine mammary epithelial cells (BMEC). AdipoRs mRNAs were widely expressed in various bovine tissues, but adiponectin mRNA expression was significantly higher in adipose tissue than in other tissues. In the mammary gland, although adiponectin mRNA expression was significantly decreased at lactation, AdipoR1 mRNA expression was significantly higher at peak lactation than at the dry‐off stage. In BMEC, lactogenic hormones and GH upregulated AdipoR2 mRNA expression but did not change that of AdipoR1. In conclusion, adiponectin and its receptor mRNA were expressed in various bovine tissues and the adiponectin mRNA level was decreased during lactation. These results suggest that adiponectin and its receptors ware changed in mammary glands by lactation and that AdipoRs mRNA expression was regulated by different pathways in BMEC.</P>
Han Kiwon,Song Hojin,Choi Chan Woong,Park Sangmi,Kang Yong Seok,Jung Kikyung,Lee Byung-Hwa,Takahashi Yoshimasa,Matsumura Takayuki,Yamamoto Akihiko,Kim Yang Jin,Jee Seung-wan,Kim Jaeok 한국독성학회 2020 Toxicological Research Vol.36 No.4
In 2017, the second national reference standard (NRS) for Gloydius snake venom was established to replace the first NRS for Gloydius snake venom. In connection with the second venom NRS, a candidate for the first NRS for Gloydius snake antivenom was produced in 2017. In this study, the qualification of the candidate was estimated and the potency was determined by a collaborative study. The potency (anti-lethal titer and anti-hemorrhagic titer) of the candidate was determined by measuring the capability of the antivenom to neutralize the lethal and hemorrhagic effects of the second NRS for Gloydius snake venom, which was calibrated against the regional reference standard for Gloydius snake antivenom established in 2006. Two Korean facilities contributed data from 20 independent assays. Subsequently, one foreign national control research laboratories participated in this collaborative study. The general common potency of the anti-lethal and anti-hemorrhagic titers was obtained from the results of a total of 25 tests performed at three facilities. According to the results of the present study, the candidate preparation showed good quality and is judged to be suitable to serve as the first NRS for Gloydius snake antivenom with the following potency: an anti-lethal titer of 3100 unit (U) (95% confidence interval 2991–3276 U) and anti-hemorrhagic titer of 3000 U (95% confidence interval 2849–3159 U). In conclusion, the first NRS for Gloydius snake antivenom was established in this study. This reference standard will be used routinely for quality control of a snake antivenom product by manufacturer in Korea, which also can be used for national quality control, including a national lotrelease test of the snake antivenom product.