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Choi SD, Kho YC, Rhodes LM, Davis GK, Chapman MG, Murrell DF. Outcomes of 11 pregnancies in three patients with recessive forms of epidermolysis bullosa. Br J Dermatol 2011; 165:700-1. [PMID: 21623758 DOI: 10.1111/j.1365-2133.2011.10441.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Choi JH, Kang NL, Choi SD. Recent trends in the distribution of common bile duct stones in urban South Koreans. J Int Med Res 2009; 37:1220-4. [PMID: 19761707 DOI: 10.1177/147323000903700429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
This retrospective, observational study was designed to analyse recent trends in the age distribution of westernized persons in South Korea with common bile duct stones (cholesterol, brown and black stones). Data on 253 patients who had received endoscopic surgery at a tertiary referral hospital in Daegu, the third largest South Korean city, were used to investigate the relationship between the numbers of patients with different types of common bile duct stones and age. There were strong correlations between age and the frequency of the three different types of common bile duct stones. The frequency of cholesterol stones decreased exponentially with increasing patient age, whereas the frequency of brown stones increased exponentially. Patients with black stones showed a Gaussian-like age distribution. Thus, the age-dependency of the frequency of these three common types of bile duct stones differed from one another within this patient population.
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Affiliation(s)
- J H Choi
- Department of Internal Medicine, Hankuk Hospital, Osan, Republic of Korea
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Choi SD, Fredericks TK. Surface slope effects on shingling frequency and postural balance in a simulated roofing task. Ergonomics 2008; 51:330-344. [PMID: 18311610 DOI: 10.1080/00140130701652824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The purpose of this study was to investigate the influence of surface slopes (18 degrees , 26 degrees , 34 degrees ) on the maximum acceptable roof shingling frequency for males performing a simulated roof-shingling task. The psychophysical roof shingling frequency was also compared to the postural sway and trunk motion values. The maximum acceptable roof shingling frequency and selected trunk motion decreased significantly with an increase in slope. Postural sway however increased significantly with an increase in slope. The study also revealed that workers were experiencing a greater postural sway at the earlier phase of task on the steeper surface. This suggests that there might be an adaptation period associated with working on a slope and the body's ability to compensate for a loss of balance. Therefore, more emphasis should be given to the workers in this adaptation period, with additional monitoring and cautionary measures. Collectively, the findings of the study could be utilized for improving work practices on roofs, while reducing the potential risks of falls in roofing construction.
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Affiliation(s)
- S D Choi
- Department of Occupational and Environmental Safety & Health, University of Wisconsin-Whitewater, Whitewater, WI 53190-1790, USA.
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Abstract
A cell-associated protein released from Bacillus pumilus PH-01 showed an affinity for some dioxins, like 1,2,3,4-tetrachlorodibenzo-p-dioxin (TCDD) and 1,2,3,4-tetrachlorodibenzofuran (TCDF), and the concentration of the protein increased when B. pumilus PH-01 was boiled in minimal salts medium. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and matrix-assisted laser desorption ionization-mass spectrometry revealed that the boiled culture supernatant contained a major protein with a molecular mass of 5,313.4 Da. The adsorption behavior of the protein for 1,2,3,4-TCDD and 1,2,3,4-TCDF was examined by digesting it with proteinase K and trypsin, showing that the proteolyzed protein lost the ability to adsorb the compounds. The amino acid sequence of the protein was determined by automated Edman degradation and tandem mass spectrometry. A search of the protein databases showed no existence of proteins with an homologous sequence.
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Affiliation(s)
- H B Hong
- School of Environmental Engineering, Pohang University of Science and Technology, Korea
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Abstract
This study was focused on the effects of microfilament inhibitor, Cytochalasin D (CD) on the invasiveness of sporozoites of Cryptosporidium spp. into the host cells. MDCK and AGS cell lines were used as host cells for C. parvum and C. muris, respectively. When MDCK cells were pretreated with CD for 1 hr before inoculation of the sporozoites, C. parvum infection was significantly inhibited when compared to the control cells. These inhibitory effects of CD on the rate of infection were dose-dependent. In addition, C. muris infection was hampered when AGS cell lines were pretreated with CD. However, the capability of invasiveness of the sporozoites into the host cells was not greatly influenced by the pretreatment of sporozoites with CD before infection. These results suggest that microfilaments of host cells, rather than parasites, play an important role for the invasion of Cryptosporidium spp.
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Affiliation(s)
- J R Yu
- Department of Parasitology, College of Medicine, Konkuk University, Chungju 380-701, Korea.
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Koo HN, Jeong HJ, Choi JY, Choi SD, Choi TJ, Cheon YS, Kim KS, Kang BK, Park ST, Chang CH, Kim CH, Lee YM, Kim HM, An NH, Kim JJ. Inhibition of tumor necrosis factor-alpha-induced apoptosis by Asparagus cochinchinensis in Hep G2 cells. J Ethnopharmacol 2000; 73:137-143. [PMID: 11025149 DOI: 10.1016/s0378-8741(00)00287-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A human hepatoma cell line, Hep G2 cells, is a reliable system for the study of alcohol-induced hepatotoxicity. In this study, we investigated the effect of an aqueous extract of Asparagus cochinchinensis(MERRIL) (Liliaceae) roots (ACAE) on ethanol (EtOH)-induced cytotoxicity in Hep G2 cells. ACAE (1-100 microg/ml) dose-dependently inhibited the EtOH-induced tumor necrosis factor-alpha (TNF-alpha) secretion. ACAE (1-100 microg/ml) also inhibited the EtOH and TNF-alpha-induced cytotoxicity. Furthermore, we found that ACAE inhibited the TNF-alpha-induced apoptosis of Hep G2 cells. These results suggest that ACAE may prevent the EtOH-induced cytotoxicity through inhibition of the apoptosis of Hep G2 cells.
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Affiliation(s)
- H N Koo
- College of Pharmacy, Wonkwang University School of Medicine, Center of Oriental Medicinal Science, Wonkwang University, Iksan, 570-749, Chonbuk, South Korea
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Chaparro A, Rogers M, Fernandez J, Bohan M, Choi SD, Stumpfhauser L. Range of motion of the wrist: implications for designing computer input devices for the elderly. Disabil Rehabil 2000; 22:633-7. [PMID: 11052213 DOI: 10.1080/09638280050138313] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
PURPOSE The purpose of this study was to report normative values of the amplitude of joint wrist motions and grip strength for older age groups. METHOD Volunteers. (N = 147) were divided into four age groups, 60-69, 70-79, 80-89 and 90+ years, with a total of 62 men and 85 women. Maximum range motion values were obtained for wrist flexion, extension and ulnar deviation. In addition, grip strength measures were obtained for each participant. RESULTS In general, the strength and ROM values for the oldest participants in this study were lower than those of the younger age group (age 60 to 69) and significantly lower than those published for subjects between 25 and 54 years of age. Furthermore, across all age groups males were significantly stronger than females. However, females tended to have greater ROM than males, particularly for wrist extension and ulnar deviations. Joint ROM and grip strength declined significantly with age for both males and females. Comparisons with published data for younger subjects (age 25-35) indicate that a 60-69 year old male, will on average experience a decline in wrist flexion, extension and ulnar deviation of 12%, 41%, and 22% respectively. By age 90, an individual may be expected to have ROM values that are only approximately 60% of an average 30 year old individual. CONCLUSION The results suggest that the ageing population (particularly men) may face greater difficulty using an input device such as a mouse that relies on motions of the wrist. In addition, the reduced ROM of the wrist may put the elderly at greater risk of developing cumulative trauma disorders. The implications of these findings for the design of input devices are discussed.
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Affiliation(s)
- A Chaparro
- Department of Psychology, Wichita State University, KS 67260-0034, USA.
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Abstract
To determine a suitable condition for in vitro infection model of Cryptosporidium parvum, four different cell lines, AGS, MDCK, HCT-8 and Caco-2, were used as host cell lines which were cultured at various concentrations of added supplements. These supplement include fetal bovine serum (FBS), sodium choleate, ascorbic acid, folic acid, calcium pantothenate, para-aminobenzoic acid and pyruvate and their effects on the cell lines which were infected with C. parvum were evaluated. The results of this study showed that the AGS cell line was most susceptible to C. parvum whereas the Caco-2 cells appeared to be least susceptible to C. parvum. In regards to the serum condition, 10% FBS was suitable for the growth of AGS and HCT-8 cells, and 1% FBS was good for the growth of the MDCK cells when they were inoculated with C. parvum. Vitamins had a positive effect on the AGS cells, and pyruvate also showed positive effects on all of the cell lines except for Caco-2. Modified medium for each cell line was prepared by adding appropriate amounts of each supplement which resulted in the highest parasite infection number. Modified media increased the number of parasites infected on AGS cells to 2.3-fold higher when compared to the control media. In this study, we found that the AGS cell line was a suitable host model for evaluating C. parvum in vitro study and the media contents for the optimal infection conditions were suggested.
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Affiliation(s)
- J R Yu
- Department of Parasitology, College of Medicine, Konkuk University, Chungju, Korea.
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Abstract
Contact energy transfer from DNA bases to various ligands, which can be represented by the ratio of the fluorescence intensity Q(lambda)/Q310nm, is measured by conventional fluorometer. 4',6-Diamidino-2-phenylindole and 2'-(4-hydroxyphenyl)-5-(4-methyl-1-piperazinyl)-2,5'-bi-1H-benzimidazole can accept energy from DNA bases and exhibit the ratio Q(lambda)/Q310nm, similar to that of intercalators, although these molecules are known to bind preferentially to the minor groove of the adenine-thymine rich region of DNA. When porphyrin is intercalated in DNA or poly[d(G-C)2], the shape of the ratio Q(lambda)/Q310nm is distinct from that of the ethidium-DNA complex with two maxima at 250 nm and 280 nm. The ratio Q(lambda)/Q310nm of the porphyrin-poly[d(A-T)2] complex, in which porphyrin is known to bind 'outside' of the DNA stem, is similar to that of intercalators. Therefore, energy from excited DNA bases can be transferred not only to an intercalated ligand through direct contact but also to that bound in the minor groove. It follows from this observation that using energy transfer as a criterion for DNA intercalation requires extreme caution.
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Affiliation(s)
- K M Hyun
- Department of Chemistry, College of Sciences, Yeungnam University, Kyoungsan City, South Korea
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Choi SD, Kim MS, Kim SK, Lincoln P, Tuite E, Nordén B. Binding mode of [ruthenium(II) (1,10-phenanthroline)2L]2+ with poly (dT*dA-dT) triplex. Ligand size effect on third-strand stabilization. Biochemistry 1997; 36:214-23. [PMID: 8993336 DOI: 10.1021/bi961675a] [Citation(s) in RCA: 116] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The binding of homochiral [Ru(II)(1,10-phenanthroline)2L]2+ complexes [where [L = 1,10-phenanthroline (phen), dipyrido[3,2-a:2',3'-c]phenazine (DPPZ) or benzodipyrido[3,2-a:2',3'-c]phenazine (BDPPZ)] to poly(dT*dA-dT) triplex has been investigated by linear and circular dichroism and thermal denaturation. Analysis of the linear dichroism spectra indicates that the extended DPPZ and BDPPZ ligands lie approximately parallel to the base-pair and base-triplet planes consistent with intercalation which is also supported by strong hypochromism in the interligand absorption bands with either duplex or triplex. The spectral properties of any of the metal complex enantiomers were similar for binding to either duplex or triplex DNA, indicating that the third strand, which occupies the major groove of the template duplex, has little effect on the binding geometries and hence supports the hypothesis that the metal complexes all bind from the minor groove with the DPPZ and BDPPZ ligands intercalated but without intercalation in the case of [Ru(phen)3]2+. Third-strand stabilization depended on the nature of the third substituted phenanthroline chelate ligand but was not directly related to its size, with stabilizing power increasing in the order phen < BDPPZ < DPPZ. This observation further supports intercalation of the extended ligands from the minor groove of the triplex since the extended BDPPZ ligand that would protrude into the major groove of the template would have greater steric interference than DPPZ with the third DNA strand.
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Affiliation(s)
- S D Choi
- Department of Chemistry, College of Sciences, Yeungnam University, Kyoung-buk, Republic of Korea
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Cho YJ, Choi SD. Determination of deformation-potential constants from quantum-limit cyclotron-resonance linewidths for Ge with anisotropic scattering. Phys Rev B Condens Matter 1996; 53:6896-6899. [PMID: 9982116 DOI: 10.1103/physrevb.53.6896] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ryu JY, Kang YB, Oh S, Suzuki A, Choi SD. Hot-electron magnetophonon resonance of quantum wells in tilted magnetic fields. Phys Rev B Condens Matter 1995; 52:11089-11095. [PMID: 9980206 DOI: 10.1103/physrevb.52.11089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Choi CH, Cho YJ, Yi HS, Choi SD. Convergence of continued-fraction representation for the Green's function in the Hubbard model. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1995; 52:3221-3223. [PMID: 9963770 DOI: 10.1103/physreve.52.3221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Sug JY, Kang NL, Ryu JY, Choi SD. Continued fraction formalism of linear dynamic conductivity by a combined projection technique. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1995; 51:929-934. [PMID: 9962733 DOI: 10.1103/physreve.51.929] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kang J, Hong JH, Hwang DW, Jeong JI, Choi SD, Yang CJ, Lee YP, Olson CG, Kang K, Min BI. Hybridization and correlation effects in the photoemission spectra of RNi2 (R=Ce, Pr, and Nd). Phys Rev B Condens Matter 1994; 49:16248-16255. [PMID: 10010771 DOI: 10.1103/physrevb.49.16248] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Cho YJ, Choi SD. Calculation of quantum-limit cyclotron-resonance linewidths in Ge and Si by the isolation-projection technique. Phys Rev B Condens Matter 1994; 49:14301-14306. [PMID: 10010510 DOI: 10.1103/physrevb.49.14301] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Min BI, Kang J, Hong JH, Jeong JI, Lee YP, Choi SD, Lee WY, Yang CJ, Olson CG. Electronic and magnetic structures of the rare-earth permanent magnet Nd2Fe14B. Phys Rev B Condens Matter 1993; 48:6217-6224. [PMID: 10009165 DOI: 10.1103/physrevb.48.6217] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kim JH, Ryu JY, Choi SD. Model of cluster-movement dynamics and its equilibrium distribution. Phys Rev B Condens Matter 1993; 48:836-843. [PMID: 10007939 DOI: 10.1103/physrevb.48.836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Cho YJ, Choi SD. Theory of cyclotron-resonance line shapes based on the isolation-projection technique. Phys Rev B Condens Matter 1993; 47:9273-9278. [PMID: 10004992 DOI: 10.1103/physrevb.47.9273] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abstract
Chronic stable diabetic patients (n = 6) were compared with healthy control subjects (n = 5) after acute oral intake of 50 mEq of potassium chloride (KCl) to investigate for possible derangements of homeostatic responses for acute term (3 hrs) to acute potassium load. Plasma renin activity (PRA), plasma aldosterone (PA), and transtubular potassium concentration gradient (TTKG) known as a useful semiquantative index of distal nephron potassium secretion were measured. All the baseline parameters were comparable between diabetic and non-diabetic subjects except for significantly reduced creatinine clearance in diabetics (mean +/- SEM, 105 +/- 4 vs. 85 +/- 5 ml/min, p < 0.05). Following acute oral KCl load, the peak increases of serum potassium changes from basal levels were noted at 2 hours in both groups, but were higher in diabetic subjects (mean +/- SEM, 0.42 +/- 0.06 vs. 0.62 +/- 0.09 mEq/L). Also, 4 out of 6 diabetic subjects but none of the control subjects at 2 hours after oral KCl load became hyperkalemic ( > 5.0 mEq/L). PRA did not show any significant changes, whereas PA was increased simultaneously with increments in serum potassium in both groups, with blunted increases in the diabetics. However, TTKG was increased prominently in control subjects (8.18 from 4.98), but only slightly in diabetic subjects (4.55 from 4.18), with statistical difference between the two groups (p < 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- H J Kim
- Dept. of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
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Kang J, Hong JH, Jeong JI, Choi SD, Yang CJ, Lee YP, Olson CG, Min BI, Allen JW. Photoemission study of RCo2 (R=Ce, Pr, Nd). Phys Rev B Condens Matter 1992; 46:15689-15696. [PMID: 10003709 DOI: 10.1103/physrevb.46.15689] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abstract
Using a dual-isohypercapnic technique, the authors determined the effect of equipotent doses of methohexital (1.5 mg/kg) and etomidate (0.3 mg/kg) on the ventilatory response to CO2 (VERCO2) in six healthy volunteers. Speed of induction and duration of hypnosis did not differ significantly between the two drugs. Within 2 min after injection, the slope of VERCO2 decreased significantly after both methohexital (from 2.52 to a minimum of 0.15 l . min-1 . mmHg-1, P less than 0.05) and etomidate (from 2.56 to a minimum of 0.62 l . min-1 . mmHg-1, P less than 0.05); the magnitude of this depression did not differ significantly between the drugs. Methohexital also caused a significant decrease in minute ventilation at end-tidal PCO2 of 46 mmHg (VE 46) from 14.6 to 4.3 l . min-1 within 60 s after injection (P less than 0.05). In contrast, after etomidate VE 46 gradually increased from 17.9 1 . min-1 to a maximum of 31.6 l . min-1 at 3.5 min after injection (P less than 0.05); respiratory rate increased significantly, while changes in tidal volume were not significant. Effects of etomidate and methohexital on VE 46 differed significantly (P less than 0.001). These data indicate that, while etomidate and methohexital similarly depress the medullary centers that modify ventilatory drive in response to changing CO2 tensions, ventilation at any given CO2 tension is greater after etomidate than after methohexital. This indicates that etomidate may cause a CO2-independent stimulation of ventilation, suggesting its use for induction of anesthesia in cases where maintenance of spontaneous ventilation is desirable.
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Spaulding BC, Choi SD, Gross JB, Apfelbaum JL, Broderson H. The effect of physostigmine on diazepam-induced ventilatory depression: a double-blind study. Anesthesiology 1984; 61:551-4. [PMID: 6437287 DOI: 10.1097/00000542-198411000-00013] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The authors conducted a double-blind crossover study to determine the effects of physostigmine salicylate on hyperoxic ventilatory response to carbon dioxide (VE RCO2) and on awareness in healthy subjects previously sedated with diazepam. Diazepam 0.4 mg/kg iv decreased the slope of VE RCO2 from 2.41 +/- 0.19 to 1.30 +/- 0.15 1 . min-1 . mmHg-1 (mean +/- SEM, P less than 0.001). Subsequent injection of physostigmine 2.0 mg iv was associated with a 0.20 +/- 0.28 1 . min-1 . mmHg-1 decrease in slope; this was significantly different from the 0.56 +/- 0.22 1 . min-1 . mmHg-1 increase in slope associated with saline placebo (P less than 0.05). Level of consciousness, on the other hand, increased more after physostigmine than after saline (P less than 0.01). The authors conclude that despite an apparent increase in awareness resulting from physostigmine administration, the accompanying decrease in ventilatory drive may contraindicate its use in patients who previously have received diazepam.
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Chun D, Choi SD, Suh JH, Moon YS. Typing of nontypable staphylococci by lysogeny. Appl Microbiol 1967; 15:13-6. [PMID: 4227734 PMCID: PMC546835 DOI: 10.1128/am.15.1.13-16.1967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Strains of coagulase-positive staphylococci which were nontypable with the routine typing set of phages could be typed by lysogeny with phage-propagating strains as indicators and with ultraviolet induction. About 10% of the strains could be typed without induction. About 36% of them could be typed by this method when ultraviolet irradiation was used as an inducing agent. The phage groups from which the majority of the nontypable staphylococci originated were easily identified by this method of typing.
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