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김형석,신남철,이태호,박승조 동아대학교 환경문제연구소 1991 硏究報告 Vol.14 No.2
To conditioning sludge to occure in the course of food processing industry, after culturing Rhoodotorula glutinis, dosing a certain amount of culture solution into the sludge and measured the variation of total suspended solids and then, in the aerobic and anaerobic conditions after manage sludge, examining the result of measured specific resitance, the coefficient of cmopressibility to know the dewateability. Arrangements of this result are as follows : 1) As the result of total suspended solids concentration by change of aeration time and the amount of Rhodotorula glutinis dose, optimal dose was Rhodotorula glutinis 10㎖ by 20㎖ sludge. The very suitable aeration time was 4-5days. 2) After dosing biological conditioner(Rhodotorula glutinis) 60㎖ by 11 sludge in aerobic condition, aeration for five days. The results of specific resistance, the coefficient of compressibility were 22.71×10^(5)m/㎏ 1.6, respectively. 3) In the cases of using Rhodotoruls glutinis for biological conditioner, using polymer for chemical conditioner. This results are as follows : Biological conditioner ; the moisture content of sludge cake 77.7% Chemical conditioner ; the moisture content of sludge cake 70.3% But, I author propose that biological conditioner is more useful than chemicals in the total operating and maintenance cost.
Cho, Hyeong-jin,Madhurakkat Perikamana, Sajeesh Kumar,Lee, Ji-hye,Lee, Jinkyu,Lee, Kyung-Mi,Shin, Choongsoo S.,Shin, Heungsoo American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.14
<P>Although bone morphogenic proteins (BMPs) have been widely used for bone regeneration, the ideal delivery system with optimized dose and minimized side effects is still active area of research. In this study, we developed bone morphogenetic protein-2(BMP-2) immobilized poly(<SMALL>l</SMALL>-lactide) (PLLA) nanofibers inspired by polydopamine, which could be ultimately used as membranes for guided bone regeneration, and investigated their effect on guidance of in vitro cell behavior and in vivo bone formation. Surface chemical analysis of the nanofibers confirmed successful immobilization of BMP-2 mediated by polydopamine, and about 90% of BMP-2 was stably retained on the nanofiber surface for at least 28 days. The alkaline phosphatase activity and calcium mineralization of human mesenchymal stem cells (hMSCs) after 14 days of in vitro culture was significantly enhanced on nanofibers immobilized with BMP-2. More importantly, BMP-2 at a relatively small dose was highly active following implantation to the critical-sized defect in the cranium of mice; radiographic analysis demonstrated that 77.8 ± 11.7% of newly formed bone was filled within the defect for a BMP-2-immobilized groups at the concentration of 124 ± 9 ng/cm<SUP>2</SUP>, as compared to 5.9 ± 1.0 and 34.1 ± 5.5% recovery, for a defect-only and a polydopamine-only group, respectively. Scanning and transmission electron microscopy of samples from the BMP-2 immobilized group showed fibroblasts and osteoblasts with nanofiber strands in the middle of regenerated bone tissue, revealing the importance of interaction between implanted nanofibers and the neighboring extracellular environment. Taken together, our data support that the presentation of BMP-2 on the surface of nanofibers as immobilized by utilizing polydopamine chemistry may be an effective method to direct bone growth at relatively low local concentration.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-14/am501391z/production/images/medium/am-2014-01391z_0011.gif'></P>