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정호철,이상한,정신교 慶北大學校農業科學技術硏究所 2007 慶北大農學誌 Vol.25 No.-
The several enzymes reaction which involve the quality change of fresh vegetables, such as chlorophylase, polyphenol oxidase, lypoxygenase, C-S-Iyase, myrosinase and enzymes related lignification were reviewed. Numerous enzyme reaction continuously proceeds to the deterioration of vegetables after harvest due to the respiration and biochemical metabolism reaction, especially in case of physical injuring. It is extremely important to inhibit and to control these enzyme reaction in order to maintain the organoleptic and nutritional quality of fresh vegetables.
Deblurring Low-Light Images with Light Streaks
Hu, Zhe,Cho, Sunghyun,Wang, Jue,Yang, Ming-Hsuan IEEE 2018 IEEE transactions on pattern analysis and machine Vol.40 No.10
<P>Images acquired in low-light conditions with handheld cameras are often blurry, so steady poses and long exposure time are required to alleviate this problem. Although significant advances have been made in image deblurring, state-of-the-art approaches often fail on low-light images, as a sufficient number of salient features cannot be extracted for blur kernel estimation. On the other hand, light streaks are common phenomena in low-light images that have not been extensively explored in existing approaches. In this work, we propose an algorithm that utilizes light streaks to facilitate deblurring low-light images. The light streaks, which commonly exist in the low-light blurry images, contain rich information regarding camera motion and blur kernels. A method is developed in this work to detect light streaks for kernel estimation. We introduce a non-linear blur model that explicitly takes light streaks and corresponding light sources into account, and pose them as constraints for estimating the blur kernel in an optimization framework. For practical applications, the proposed algorithm is extended to handle images undergoing non-uniform blur. Experimental results show that the proposed algorithm performs favorably against the state-of-the-art methods on deblurring real-world low-light images.</P>
Hu-Zhe Zheng,Sun-Young Kwon,Shin-Kyo Chung 한국응용생명화학회 2020 Journal of Applied Biological Chemistry (J. Appl. Vol.63 No.3
In order to enhance the extraction efficiency of flavonoid from Saururus chinensis, carbohydrate-hydrolyzing enzyme Viscozyme L aided extraction techniques have been studied. Then flavonoid composition, as well as quercetin, were also identified using UV/Vis, HPLC/MS, and 1H-NMR. The results showed that favorable extraction conditions were Viscozyme L concentration of 0.25 mg/g, pH 4.2, reaction at 45 oC for 12 h. Under the favorable extraction condition, total flavonoid yield (37.9 mg/g) and quercetin yield (0.86 mg/g) increased by about 2.0 and 9.6 times, respectively, compared to control group. Interestingly, as a significant flavonoid of S. chinensis, flavonoid glycones rutin was hydrolyzed to aglycones quercetin by Viscozyme L. These findings provide scientific and theoretical support for the development quercetin-rich products, which was quickly absorbed by the human body than rutin.
Hu, Zhe,Liu, Qiannan,Zhang, Kai,Zhou, Limin,Li, Lin,Chen, Mingzhe,Tao, Zhanliang,Kang, Yong-Mook,Mai, Liqiang,Chou, Shu-Lei,Chen, Jun,Dou, Shi-Xue American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.42
<P>Dual ion batteries based on Na<SUP>+</SUP> and PF<SUB>6</SUB><SUP>-</SUP> received considerable attention due to their high operating voltage and the abundant Na resources. Here, cheap and easily obtained graphite that served as a cathode material for dual ion battery delivered a very high average discharge platform (4.52 V vs Na<SUP>+</SUP>/Na) by using sodium hexafluorophosphate in propylene carbonate as electrolyte. Moreover, the all-carbon dual ion batteries with graphite as cathode and hard carbon as anode exhibited an ultrahigh discharge voltage of 4.3 V, and a reversible capacity of 62 mAh·g<SUP>-1</SUP> at 40 mA·g<SUP>-1</SUP>. Phase changes have been investigated in detail through in situ X-ray diffraction and in situ Raman characterizations. The stable structure provides long life cycling performance, and the pseudocapacitance behavior also demonstrates its benefits to the rate capability. Thus, dual ion batteries based on sodium chemistry are very promising to find their applications in future.</P> [FIG OMISSION]</BR>
Phenolics Enrichment Process from Unripe Apples
Hu-Zhe Zheng,황인욱,김병관,김영찬,정신교 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.4
Unripe apples contain significant amount of phenolicswith various health benefits. A pilot scale enrichment process ofunripe apple phenolics with Viscozyme L extraction and XAD-7sorption process, based on the total phenolic content (TPC),phenolics content by high-performance liquid chromatographyanalyses, and antioxidant activities were studied. Antioxidantactivities were tested by measuring oxygen radical absorbingcapacity (ORAC), 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicalscavenging activity, and ferric-reducing antioxidant power(FRAP). The phenolics-rich final product, apple antioxidantphenolics (AAP) has 771-fold higher TPC and 600-fold higherantioxidant activity of unripe apples. Through XAD-7 sorptionAAP showed 52, 87, 70 and 44-fold increases in TPC, ORAC,DPPH and FRAP values, respectively. AAP showed more than95% stability at the temperature range of 20 to 120°… and pHrange of 1.47 to 8.5. Apple phenolics extraction process ofViscozyme L extraction coupled with XAD-7 sorption could beapplied to the production of health benefit antioxidants.
Hu Zhe Zheng,In Wook Hwang,Suk Kyung Kim,Sang Han Lee,Shin Kyo Chung 한국응용생명화학회 2010 Journal of Applied Biological Chemistry (J. Appl. Vol.53 No.3
Unripe apples lie scattered about the orchards because of manual thinning out or falling, however they contain a high amount of polyphenol. In order to enhance the extraction of polyphenol from the unripe apples, carbohydrate-hydrolyzing enzyme (Viscozyme