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Ji-Hae Park,Do-Gyeong Lee,Seung-Woo Yeon,Hyuk-Sang Kwon,Jong-Hee Ko,Dong-Jin Shin,Han-Sol Park,Yong-Soon Kim,Myun-Ho Bang,NAM-IN BAEK 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.4
The silkworm (Bombyx mori L.) droppings were extracted with 80% aqueous MeOH, and the concentrated extract was partitioned in succession with EtOAc, n-BuOH, and H_2O. From the EtOAc fraction, five megastigmane sesquiterpenes were isolated through repeated silica gel and ODS column chromatography. According to the results of spectroscopic data, such as NMR, MS, and IR, the chemical structures of the isolated compounds were determined as (3S,5R,8R)-3,5-dihydroxymegastigma-6,7-dien-9-one (1), (S)-dehydrovomifoliol (2), (6R,7E,9R)-9-hydroxy-4,7-megastigmadien-3-one (3), (3S,5R,6S,7E)-3,5,6-trihydroxy-7-megastigmen-9-one (4), (6R,9R)-9-hydroxy-4-megastigmen-3-one (5). Compounds 2 through 5 were isolated for the first time from silkworm droppings. GC/MS analysis indicated silkworm powder contained compound 3, and mulberry leaves contained compound 4. Compounds 1 and 5 increased the expression of heme oxygenase-1 and SIRT1 in HepG2 and HEK239 cells, respectively. Heme oxygenase-1 is considered to be an antioxidant enzyme that catabolizes heme to carbon monoxide, free iron and biliverdin, while SIRT1 is the mammalian homologue of the yeast silent information regulator (Sir)-2, which are involved in the suppression of inflammatory mediators or factors that may be used to improve atopy-related symptoms.
Matrix-Stripe-Cache-Based Contiguity Transform for Fragmented Writes in RAID-5
Baek, Sung Hoon,Park, Kyu Ho IEEE 2007 IEEE Transactions on Computers Vol.56 No.8
<P>Given that contiguous reads and writes between a cache and a disk outperform fragmented reads and writes, fragmented reads and writes are forcefully transformed into contiguous reads and writes via a proposed matrix-stripe-cache-based contiguity transform (MSC-CT) method which employs a rule of consistency for data integrity at the block level and a rule of performance that ensures no performance degradation. MSC-CT performs for reads and writes, both of which are produced by write requests from a host as a write request from a host employs reads for parity update and writes to disks in a redundant array of independent disks (RAID)-5. MSC-CT is compatible with existing disk technologies. The proposed implementation in a Linux kernel delivers a peak throughput that is 3.2 times higher than a case without MSC-CT on representative workloads. The results demonstrate that MSC-CT is extremely simple to implement, has low overhead, and is ideally suited for RAID controllers not only for random writes but also for sequential writes in various realistic scenarios.</P>
Radiobiological Characterization of Proton Beam at the National Cancer Center in Korea
BAEK, Hye-Jung,KIM, Tae-Hyun,SHIN, Dongho,KWAK, Jung-Won,CHOO, Dong-Wan,LEE, Se-Byung,FURUSAWA, Yoshiya,ANDO, Koichi,KIM, Sang-Soo,CHO, Kwan-Ho Journal of Radiation Research Editorial Committee 2008 JOURNAL OF RADIATION RESEARCH Vol.49 No.5
<P>Estimation of the relative biological effectiveness (RBE) of the proton beam at the National Cancer Center Proton Therapy Center in Korea (NCCPTC) is required clinically for the treatment of cancer. The proton beam was fixed at 190 MeV with 6 cm a spread out Bragg peaks (SOBP) for which corresponds to most frequent clinical condition. The RBE was estimated from the survival of human salivary gland (HSG) cells using the traditional colonogenic and MTT assays. The HSG cells were also irradiated in a cell-stack chamber and monitored for survival to identify whether the characteristic depth-dependent survival pattern was observed. The RBE of the NCCPTC was estimated to be 1.024 ± 0.007 and 1.049 ± 0.028 at the middle of SOBP using colonogenic and MTT assays, respectively. Further analysis of the biological response of proton exposure revealed no difference compared to conventional X-ray treatment in western blot, and FACS analysis. The proton beam of the NCCPTC also exhibited the characteristic depth-dependent survival pattern. The estimated RBE value of NCCPTC was slightly smaller than generic RBE value of 1.1 for protons of the majority of centers. Due to the recommendation of a generic RBE of 1.1 for protons, a representative RBE value of 1.1 was assigned for clinical application for proton beams at the NCCPTC.</P>
( Sung Ha Lim ),( Solam Lee ),( Young Bin Lee ),( Chung Hyeok Lee ),( Jong Won Lee ),( Sang Hoon Lee ),( Ju Yeong Lee ),( Joung Soo Kim ),( Mi Youn Park ),( Sang Baek Koh ),( Eung Ho Choi ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: Whether having a tattoo increases the risk of transfusion transmitted diseases (TTDs) is controversial. Objectives: To identify prevalence and risk of TTDs in people with tattoos as compared with the general population. Methods: A systematic review of the studies published before September 2019 was performed by using the Medline, Embase, and Web of Science databases. Observational studies on hepatitis C virus (HCV), hepatitis B virus (HBV), human immunodeficiency virus (HIV), and syphilis infections in people with and without tattoos were included. Studies that reported disease status without serological confirmation were excluded. Results: A total of 115 studies were quantitatively analyzed. HCV (odd ratio [OR], 2.94; 95% confidence interval [CI], 2.52-3.44), HBV (OR, 1.53; 95% CI, 1.34-1.76), and HIV infections (OR, 3.42; 95% CI, 2.16-5.41) were more prevalent in the tattooed population. In subgroup analyses, after the adjustment of possible publication bias, the prevalence of HCV infection was significantly elevated in the community-dwelling, hospital patient, intravenous (IV) drug user, and prisoner groups. IV drug users and prisoners showed high prevalence rates of HBV infection. The prevalence of HIV infection was significantly increased in the prisoner group. Conclusion: Having a tattoo is associated with an increased prevalence of TTDs. Our approach clarifies in depth and supports a guideline for TTD screening in the tattooed population.
Fulminant hepatic failure caused by diffuse lymphangitic liver metastasis from colon c ancer
( Ho Seok Chi ),( Dong Yeop Shin ),( Sun Young Kim ),( Ji Yeon Baek ),( Min Ju Kim ),( Sang Myung Woo ),( Hee Jin Chang ),( Eun Kyung Hong ),( Chang Woo Shim ),( Do Il Choi ),( Hye In Lee ),( Sang Ho 대한내과학회 2015 대한내과학회 추계학술발표논문집 Vol.2015 No.1
We report a rare case of Diffuse lymphangitic liver metastasis from colon cancer. A 56-year-old man was diagnosed Ascending colon cancer and metastases to retroperitoneal lymph nodes and peritoneum. He underwent palliative right hemicolectomy. Postoperative computed tomography (CT) revealed newly developed metastasis in liver and lymph nodes around superior mesenteric artery. He was enrolled in a phase II clinical trial of palliative triplet chemotherapy with S-1, irinotecan and oxaliplatin. After 6 cycles of chemotherapy, his blood test revealed abnormal Liver function. He presented with acute onset jaundice. Imaging studies did not show abnormal finding except periportal linear hypo-attenuating area. Endoscopic retrograde cholangiography showed tight stricture of proximal common bile duct. Endoscopic sphicterotomy was done and stent was inserted into common bile duct. However his total bilirubin level continued to rise after sphincterotomy. Blind liver biopsy revealed tumor infiltration along lymphatics in liver. Hepatic parenchyma and sinusoids were not involved by tumor. Tumor cells were mainly confined within lymphatic vessels, neither arteries nor veins. Although one loading dose of cetuximab and two fraction of palliative radiation therapy were given, the patient died of fulminant hepatic failure 30 days after development of jaundice.