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Muammel M. Hanon,Nihal D. Salman,Dhia A. Alazawi 한국항공우주학회 2018 International Journal of Aeronautical and Space Sc Vol.19 No.3
The accuracy of mass flow rate in injector depends upon the derivation of nozzle diameter (dc) and discharge coefficient (Cd). To compare the relationship between different dimensions of injectors, the relative variation mass flow rate through the injector is calculated according to the accuracy of high-class precision to get maximum relative deviation of mass flow rate. In this paper, the effect of engineering tolerances of three dimensions (nozzle diameter, depth of tangential channel and radius of twisting arm) on the mass flow rate of swirl injector was investigated through an experimental study. Then, the maximum relative deviation of mass flow rate (Δm˙/m˙)max between different swirl injectors was measured. The experimental results show that the (Δm˙/m˙)max was affected by the tolerances of nozzle diameter and depth of inlet channel greater than radius of twisting arm.
P007 Changes of decorin and biglycan in intrinsically aged and photoaged human skin
( Jang-hee Oh ),( Hanon Lee ),( Min Kyeong Shin ),( Ji Soo Lim ),( Soyun Cho ),( Jin Ho Chung ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2
<div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div> Background: Loss of mature collagen and increase of matrix metalloproteinase expression are the major molecular change during skin aging processes; however, change of glycosaminoglycans (GAGs) and proteoglycans in skin aging processes has not been well elucidated. Objectives: To investigate the skin aging-related changes of decorin and biglycan, including their protein expression levels and GAG chain length in intrinsically aged and photoaged human skin. Methods: Skin samples of buttock and forearm skin were obtained from young (20~40 yr, n=6) and aged volunteers (70~78 yr, n=9). Expression level of decorin and biglycan was investigated with real-time RT-PCR and Western blot analysis. Size shift to their core proteins was confirmed by treatment with chondroitinase ABC. Results: mRNA level of decorin and biglycan was not significantly reduced during skin aging. In contrast, by Western blot analysis of dermal protein samples, biglycan levels were significantly reduced in intrinsically aged buttock dermis, compared to young buttock dermis, while decorin levels did not. Sizes of decorin and biglycan were decreased in intrinsically aged buttock skin; however, their sizes were increased in aged forearm skin, compared to each individual’s buttock skin. Conclusion: Reduction of biglycan levels and the GAG chain length changes of decorin and biglycan in aged dermis may give some clues for explanation of aging-related skin phenotypes.
Goffin, Dorothee,Bystricky, Peter,Shashkov, Alexander S.,Lynch, Mary,Hanon, Emilien,Paquot, Michel,Savage, Angela V. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.11
Prebiotic isomaltooligosaccharide preparations contain $\alpha$-D-glucooligosaccharides comprising isomaltooligosaccharides (IMOs) and non-prebiotic maltooligosaccharides (MOs). They are both glucose oligosaccharides characterized by their degree of polymerization (DP) value (from 2 to $\sim$10), linkages types and positions (IMOs: $\alpha$-(1$\rightarrow$2, 3, 6 and in a lower proportion internal 1$\rightarrow$4) linkages, MOs: α-(1$\rightarrow$4) linkages). Their structure is the key factor for their prebiotic potential. In order to determine and elucidate the exact structure of unknown IMOs and MOs, unambiguous assignments of $^{13}C$ and $^1H$ chemical shifts of commercial standards, representative of IMOs and MOs diversity, have been determined using optimized standard one and two-dimensional experiments such as $^1H$ NMR, $^{13}C$ NMR, APT and ${^1}H-{^1}H$ COSY, TOCSY, NOESY and <$^1H-{^{13}}C$ heteronuclear HSQC, HSQC-TOCSY, and HMBC. Here we point out the differential effect of substitution by a glucose residue at different positions on chemical shifts of anomeric as well as ring carbons together with the effect of the reducing end configuration for low DP oligosaccharides and diasteroisotopic effect for H-6 protons. From this study, structural $^{13}C$ specific spectral features can be identified as tools for structural analysis of isomaltooligosaccharides.
Dorothée Goffin,Peter Bystricky,Alexander S. Shashkov,Mary Lynch,Emilien Hanon,Michel Paquot,Angela V. Savage 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.11
Prebiotic isomaltooligosaccharide preparations contain α-D-glucooligosaccharides comprising isomaltooligosaccharides (IMOs) and non-prebiotic maltooligosaccharides (MOs). They are both glucose oligosaccharides characterized by their degree of polymerization (DP) value (from 2 to ~10), linkages types and positions (IMOs: α-(1→2, 3, 6 and in a lower proportion internal 1→4) linkages, MOs: α-(1→4) linkages). Their structure is the key factor for their prebiotic potential. In order to determine and elucidate the exact structure of unknown IMOs and MOs, unambiguous assignments of 13C and 1H chemical shifts of commercial standards, representative of IMOs and MOs diversity, have been determined using optimized standard one and two-dimensional experiments such as 1H NMR, 13C NMR, APT and 1H-1H COSY, TOCSY, NOESY and 1H-13C heteronuclear HSQC, HSQC-TOCSY, and HMBC. Here we point out the differential effect of substitution by a glucose residue at different positions on chemical shifts of anomeric as well as ring carbons together with the effect of the reducing end configuration for low DP oligosaccharides and diasteroisotopic effect for H-6 protons. From this study, structural 13C specific spectral features can be identified as tools for structural analysis of isomaltooligosaccharides.