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- 저자 : Hehe Kang (검색결과 2 건)
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Transcriptome reveals genes involving in black skin color formation of ducks
Lei Wang,Hehe Liu,Bo Hu,Jiwei Hu,Hengyong Xu,Hua He,Chunchun Han,Bo Kang,Lili Bai,Rongping Zhang,Jiwen Wang,Shengqiang Hu,Liang Li 한국유전학회 2021 Genes & Genomics Vol.43 No.2
Background Skin color is colorful for birds, which has been reported to be associated with multi-biological functions, such as crypsis, camoufage, social signaling and mate choice, but little is known about its underlying molecular mechanism. Objective Studies on the major genes afecting the black skin color of ducks. Methods For this purpose, Silver ammonia staining and RNA-seq analysis were carried out to identify the diferences in tissue morphology and gene expressions between black and yellow skin ducks. Results The silver ammonia dyes slice results showed that in the development of black duck, the content of melanin in black skin gradually increased and then decreased, and the content of melanin in yellow and black skin was signifcantly diferent. Through transcriptome, a total of 102 and 84 diferentially expressed genes (DEGs) were identifed in beak skin and web skin, respectively. These DEGs were enriched in melanin biosynthesis and play a critical role in melanogenesis pathway. Co-expression analysis showed that EDNRB2 was the only gene associated with black skin color in DEGs, which was also consistent with qRT-PCR. Conclusions The melanin synthesis pathway dominated by EDNRB2 up-regulated the amount of melanin synthesis, leading to the formation of black skin in ducks.
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On functionally-graded crashworthy shape of conical structures for multiple load cases
Tong Pang,Yinfeng Li,Hehe Kang,Guangyong Sun,Jianguang Fang,Qing Li 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.6
Many studies on energy absorbers have been focused on tapered tubes because they have significant advantages in crashworthinessand provide a desired constant load-deflection response. However, few studies have been reported on tapered tubes with nonlinearlyvariablediameters along the longitudinal direction. This paper presents thin-walled Functionally graded tapered tube (FGTT) with a diametervarying nonlinearly subject to axial (0°) and oblique (10°, 20°, 30°) impacts. To explore the advantages of FGTT, conventionalStraight/Conical circular tube (SCT/CCT) with the same mass are compared; and FGTTs with a gradient exponent n > 1 are found to bepreferable to others in terms of energy absorption capacity under small impact angles. Then, crashworthiness analyses of different crushingdistances are conducted and it is found that under a large impact angle (e.g. 20°, 30°), FGTT with a short crushing distance (e.g. 40mm) have a higher mean crashing force than long crushing distance (e.g. 120 mm), especially for n > 1. In addition, the effect of geometricparameters, such as the gradient exponent n and diameter range ΔD between top (incident) and bottom (distal) diameters of FGTTs,are also studied and it is found that the FGTT with ΔD = 40 mm and n > 1 exhibits better crashworthiness than the others under smallimpact angles (0°, 10°). This paper demonstrates that such FGTT structures have a certain potential to be an energy absorber.
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