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Development of Cellulose Hydrogel Microspheres for Lipase Immobilization
Soyeon Jo,Sae-Rom Park,Yujin Oh,Jiyeon Hong,Hyung Joo Kim,Kwang Jin Kim,Kyeong Keun Oh,이상현 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.1
Cellulose hydrogel microspheres were prepared by sol-gel transition using an ionic liquid-in-oil emulsion. Factors that influenced the formation of these microspheres, including the ratio of ionic liquid to oil, surfactant concentration, and stirring speed, were optimized for lipase immobilization. Using the optimized method, Candida rugosa lipase was efficiently immobilized on the microspheres by physical adsorption. As compared with the free lipase, the specific activity of the immobilized lipase was 1.4 times higher, its half-life at 45°C was 41 times longer, and it showed an enhanced stability over a wide pH range. The lipase immobilized on cellulose microspheres showed a much higher loading efficiency, immobilization yield, and specificity constant than lipase immobilized on microcrystalline cellulose or millimeter-sized hydrogel beads. To increase the reusability of cellulose microspheres as an enzyme support material, magnetic cellulose microspheres were also prepared by adding Fe3O4. The lipase immobilized on magnetic cellulose microspheres was simply recovered using a magnet and continuously reused with a minimal loss of activity.
Oh, Heung-Kwon,Lee, Hye Seung,Lee, Jin Ho,Oh, Se Heang,Lim, Jae-Young,Ahn, Soyeon,Kang, Sung-Bum Springer International ; Springer-Verlag, distribu 2015 International journal of colorectal disease Vol.30 No.4
<P>Basic fibroblastic growth factor (bFGF), a member of the heparin-binding growth factor family, regulates muscle differentiation. We investigated whether coadministration of autologous myoblasts and bFGF-loaded polycaprolactone beads could improve sphincter recovery in a dog model of fecal incontinence (FI). FI was induced by resecting 25 % of the posterior anal sphincter in ten mongrel dogs. One month later, the dogs were randomized to receive either PKH-26-labeled autologous myoblasts alone (M group, five dogs) or autologous myoblasts and bFGF-loaded polycaprolactone beads (MBG group, five dogs). The outcomes included anal manometry, compound muscle action potentials (CMAPs) of the pudendal nerve, and histology. The increase in anal contractile pressure over 3 months was significantly greater in the MBG group (from 4.85 to 6.83 mmHg) than that in the M group (from 4.94 to 4.25 mmHg), with a coefficient for the difference in recovery rate of 2.672 (95 % confidence interval [CI] 0.962 to 4.373, p = 0.002). The change in the CMAP amplitude was also significantly greater in the MBG group (from 0.59 to 1.56 mV) than that in the M group (from 0.81 to 0.67 mV) (coefficient 1.114, 95 % CI 0.43 to 1.80, p = 0.001). Labeled cells were detected in 2/5 (40 %) and 5/5 (100 %) dogs in the M and MBG groups, respectively. Coadministration of bFGF-loaded PCL beads and autologous myoblasts improved the recovery of sphincter function in a dog model of FI and had better outcomes than cell-based therapy alone.</P>
Soyeon Park,Haewon Shin,Pureum Noh,Seung-Yoon Oh,Hwakyung Hwang,Bitna Lee,Yongwhan Kim,Jae Chun Choe,Gilsang Jeong 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.04
Wolbachia is one of the most common endosymbionts best known to induce several reproductive alterations in its insect hosts. In some cases, the insect hosts harbor more than two strains of the bacterium. The Vollenhovia emeryi ant lives in dead trees and is morphologically subdivided into the long-winged and the short-winged. Interestingly the short-winged morph is free of Wolbachia, but only the long-winged morph is multiple- infected with the Wolbachia bacterium. We sampled four populations of the long-winged morph in Korea and performed pyrosequencing in Multilocus Sequence Typing (MLST), to determine the bacterial strain diversity. Six different gene regions (coxA, fbpA, ftsZ, gatB, hcpA and wsp gene) were targeted and amplified. However, the result shows that diversity of haplotypes is very high. The pyrosequencing approach in MLST, a new method of discriminating Wolbachia strains, is promising to effectively detect multiple infections and rare haplotypes.
Oh, Heung-Kwon,Lee, Hye Seung,Lee, Jin Ho,Oh, Se Heang,Lim, Jae-Young,Ahn, Soyeon,Hwang, Ji-Yeon,Kang, Sung-Bum Lippincott 2015 Diseases of the colon and rectum Vol.58 No.5
<P>Injection of bulking agents into the anal canal is limited by several factors, including biological resorption, particle migration, and ongoing degradation of the injected bulking agent.</P>
Microbiome of Two Morphs of Vollenhovia emeryi (Hymenoptera: Myrmicinae)
Gilsang Jeong,Soyeon Park,Pureum Noh,Seung-Yoon Oh,Hwakyung Hwang,Bitna Lee,Yongwhan Kim,Jae Chun Choe 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.04
The hologenome theory of evolution proposes that an organism is simply not an individual but the totality of numerous microbial symbionts to the host. In fact, the evidence of biochemical and physiological associations between the symbionts and the host has been growing fast in all major taxa. The Vollenhovia emeryi ant is tiny and found nationwide in Korea. The ant can be further categorized by its wing morphology, eg. long-winged and short-winged. Our initial screening process showed that the microbial reproductive manipulator, the Wolbachia bacterium, only infected the long-winged morph. This gave us a good opportunity to investigate the effect of the Wolbachia infection on the bacterial community diversity using the next generation sequencing technique. We find that there are about 180 bacterial symbionts in the short-winged morph. On the other hand, the long-winged morph has only about 20 bacterial symbionts. This implies that the bacterial community diversity may be subject to the existence of Wolbachia. Furthermore, the Wolbachia strain diversity is unexpectedly high. In addition, the bacterial structure difference among castes indicates that there may be labour division even between queens. The results and future research direction will be discussed from the hologenome theory perspective.
Pureum Noh,Seungyoon Oh,Soyeon Park,Taesung Kwon,Yonghwan Kim,Jaechun Choe,Gilsang Jeong 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
The ant species, Vollenhovia emeryi Wheeler (Hymenoptera: Myrmicinae) is endemic in East Asia and has invaded into North America. In this species, the queen caste shows polymorphism in its wing morphology; long-winged queen and short-winged queen, and two morphs are thought not to coexist in nature. This research is conducted to 1) deduce the phylogeographical structure of the two wing morphs in South Korea and to trace the distribution pattern from East Asia to North America, and 2) investigate the Wolbachia and WO phage infection frequency of the species. Either individuals or colonies of V. emeryi were collected from 80 locations, encompassing 68 locations in South Korea, 11 in Japan, and one in USA. Among the collected samples in South Korea, the long-winged morph is dominant and considered as the ancestral type, while the short-winged morph is very rare and derived character. The origin of the US population is neither Korea nor Japan at least in this study. However, we do not exclude the possibility that its origin is the other parts of Japan or the other countries. All of the long-winged morph are infected with Wolbachia, while the short-winged seems to be geographically partially infected. It suggests the possibility that the short wing trait is linked with the evolution of resistance to Wolbachia infection. Bacteriophage WO infection status has no correlation with host insect lineage.