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RISS 인기검색어
- 검색키워드
- 저자 : Guoying Du (검색결과 4 건)
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- 유료
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Spatio-temporal Variation of Intertidal Microphytobenthos in the Nakdong Estuary
Du, Guoying,Chung, Ik-Kyo The Korean Society of Oceanography 2007 바다 Vol.12 No.3
The species composition and the biomass of intertidal microphytobenthos (MPB) were investigated at four sites in the Nakdong Estuary from Feb. to Dec. 2006. The chlorophyll (chl) ${\alpha}$ concentration showed a positive correlation with MPB abundance, and depth profiles showed similar patterns: high at the surface, rapidly decreasing within 4 cm from the surface, and slowly decreasing thereafter. A MANOVA analysis revealed that the chl ${\alpha}$ concentration varied significantly not only with depth, month, and site, but also with combinations of these factors. Among the four investigated sites, site D (Baekhabdeung) showed a seasonal biomass variation trend distinct from those of the other sites: higher in summer, decreased in autumn and with sustained low values until winter. As indicated, the other sites contrastingly showed low biomasses in summer, after which the biomasses continuously increased, with some variation among the sites. A cluster analysis of species composition indicated that sites near to each other and with similar sediment structures had closer similarities in the same seasons. The species of genus Amphora and Navicula were dominant at the four sites throughout the study period.
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The rheological behavior of collagen dispersion/poly(vinyl alcohol) blends
Lai, Guoli,Du, Zongliang,Li, Guoying The Korean Society of Rheology 2007 Korea-Australia rheology journal Vol.19 No.2
Blends of collagen dispersion (COL) with poly(vinyl alcohol) (PVA) in different weight ratios were investigated by oscillatory rheometry, Fourier transform-infrared spectroscopy and scanning electron microscopy. It was found that even with 80% of PVA, the COL/PVA blends behaved more like collagen dispersion than pure PVA solution in the dynamic thermal and frequency processing, for instance, a dominant elastic appearance (G'>G"), a similar shear thinning behavior and the thermal denaturation below $40^{\circ}C$. However, influence on the blend behaviour by PVA was noticeable, for instance, an increase of dynamic denaturation temperature, the decreasing intensity of amide I, II and III bands as well as the diminishing irregular pores on the surface of blends. The interaction between collagen and PVA could be observed, especially at the regions with low content or high content of PVA.
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Rheological properties of fish skin collagen solution: Effects of temperature and concentration
Min Zhang,Yihui Chen,Guoying Li,Zongliang Du 한국유변학회 2010 Korea-Australia rheology journal Vol.22 No.2
To use collagen from freshwater fish skin as an alternative source of mammalian collagens for biomedical applications, we tested the rheological and structural properties of collagen from the skin of largefin longbarbel catfish (Mystus macropterus) by dynamic viscoelasticrheologimenteolFish skin collagen solution (FSCS) exhibited a sheor-thinning fedi behaMysr. The compllastiscosity (h*), loss tangent (tan d) and relaxic visc me of 1.5% FSCS decreased wies tkin ocrease of temperature. Also, tan d decreased wehaMythe relaxic visc me ocreased wies tkin ocrease of FSCS concentration. FSCS tiscconsider coymedicr stocon rhodulus (G'), loss hodulus (G"), h* tested and relaxic visc me and arus) by tan d teste tkaischose of bovine skin collagen solution (BSCS). Hdicver, FSCS behaMed wiesout regularity above 27.5oCi behtiowas in agreiment wies tkinisc me tkat tkindynamic denaturac viscemperature of thed collagen was approx mateoym29.5oC. Thes decreasedindicated tkat temperature and concentration ), ltococenols suitaconcfor isjusting FSCS tiscosity. The Arrhenius-typoce me-temperature superposition (TTS) was appliedCS tiisdition, tkinactitetion energy of 149.6KJ hol-1cfor 1.5% FSCS was calculated accor6KJ hentthe Arrhenius equation, indicatKJ ha weakby dntangliment effect amongal amongal amongal holeculeus (aischat amongal bovine skin collagen molecules, which was in agreement with the results from AFM measurement.
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Xuefeng Zhong,Shuai Che,Congying Xie,Lan Wu,Xinyu Zhang,Lin Tian,Chan Liu,Hongbo Li,Guoying Du The Korean Society of Phycology 2023 ALGAE Vol.38 No.2
Light quality is a common environmental factor which influences the metabolism of biochemical substances in algae and leads to the response of algal growth and development. Pyropia yezoensis is a kind of economic macroalgae that naturally grows in the intertidal zone where the light environment changes dramatically. In the present study, P. yezoensis thalli were treated under white light (control) and monochromatic lights with primary colors (blue, green, and red) for 14 days to explore their physiological response to light quality. During the first 3 days of treatment, P. yezoensis grew faster under blue light than other light qualities. In the next 11 days, it showed better adaptation to green light, with higher growth rate and photosynthetic capacity (reflected by a higher rETR<sub>max</sub> = 61.58 and E<sub>k</sub> = 237.78). A higher non-photochemical quenching was observed in the treatment of red light than others for 14 days. Furthermore, the response of P. yezoensis to light quality also results in the difference of photosynthetic pigment contents. The monochromatic light could reduce the synthesis of all pigments, but the reduction degree was different, which may relate to the spectral absorption characteristics of pigments. It was speculated that P. yezoensis adapted to a specific or changing light environments by regulating the synthesis of pigments to achieve the best use of light energy in photosynthesis and premium growth and metabolism.
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