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Panganiban C, Narsai T, Reeder D, Naderi A, Levy D, Hsieh Y, Wang B, Jean T. M152 SCHNITZLER’S SYNDROME: A RARE MIMICKER OF CHRONIC URTICARIA. Ann Allergy Asthma Immunol 2020. [DOI: 10.1016/j.anai.2020.08.224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ziyar A, Gharib A, Jean T, Hsieh Y, Levy D. M152 TREATMENT OF DELAYED PRESSURE ANGIOEDEMA WITH OMALIZUMAB IN A 40-YEAR-OLD WOMAN. Ann Allergy Asthma Immunol 2019. [DOI: 10.1016/j.anai.2019.08.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Hughes M, Lin C, Chiu P, Hsieh Y, Shieh S, Wong T, Chuong C. 1297 Lanyu pig skin pigment regeneration model. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.1313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Lin Y, Wang P, Lin C, Sadrawi M, Lin C, Hsieh Y, Kuo C, Chien J, Haraikawa K, Abbod MF, Shieh J. 0331 Apnea Recognition in Wearable Device using the Intensive Evaluation of the ECG Power Spectral Density. Sleep 2018. [DOI: 10.1093/sleep/zsy061.330] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Y Lin
- Healthcare and Beauty RD Center, Cal-Comp Inc., New Taipei City, TAIWAN
| | - P Wang
- Thoracic Division, Department of Internal Medicine, Far Eastern Memorial Hospital., New Taipei City, TAIWAN
- Oriental Institute of Technology, New Taipei City, TAIWAN
| | - C Lin
- Thoracic Division, Department of Internal Medicine, Far Eastern Memorial Hospital., New Taipei City, TAIWAN
| | - M Sadrawi
- Department of Mechanical Engineering and Innovation Center for Big Data and Digital Convergence, Yuan Ze University, Taoyuan, TAIWAN
| | - C Lin
- Healthcare and Beauty RD Center,Kinpo Electronics Inc., New Taipei City, TAIWAN
| | - Y Hsieh
- Healthcare and Beauty RD Center, Cal-Comp Inc., New Taipei City, TAIWAN
| | - C Kuo
- Healthcare and Beauty RD Center, Cal-Comp Inc., New Taipei City, TAIWAN
| | - J Chien
- Healthcare and Beauty RD Center,Kinpo Electronics Inc., New Taipei City, TAIWAN
| | - K Haraikawa
- Healthcare and Beauty RD Center,Kinpo Electronics Inc., New Taipei City, TAIWAN
| | - M F Abbod
- Department of Electronic and Computer Engineering, Brunel University London, Uxbridge, UNITED KINGDOM
| | - J Shieh
- Department of Mechanical Engineering and Innovation Center for Big Data and Digital Convergence, Yuan Ze University, Taoyuan, TAIWAN
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lin Y, Wang P, Lin C, Sadrawi M, Lin C, Hsieh Y, Kuo C, Chien J, Haraikawa K, Abbod MF, Shieh J. 0321 Wearable Device ECG and G-Sensor-based Sleep Stage Evaluation using PSG-based Learning Signal. Sleep 2018. [DOI: 10.1093/sleep/zsy061.320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Y lin
- Healthcare and Beauty RD Center,Cal-Comp Inc., New Taipei City, TAIWAN
| | - P Wang
- Thoracic Division, Department of Internal Medicine, Far Eastern Memorial Hospital., New Taipei City, TAIWAN
- Oriental Institute of Technology, New Taipei City, TAIWAN
| | - C Lin
- Thoracic Division, Department of Internal Medicine, Far Eastern Memorial Hospital., New Taipei City, TAIWAN
| | - M Sadrawi
- Department of Mechanical Engineering and Innovation Center for Big Data and Digital Convergence, Yuan Ze University, Taoyuan, TAIWAN
| | - C Lin
- Healthcare and Beauty RD Center,Kinpo Electronics Inc., New Taipei City, TAIWAN
| | - Y Hsieh
- Healthcare and Beauty RD Center,Cal-Comp Inc., New Taipei City, TAIWAN
| | - C Kuo
- Healthcare and Beauty RD Center,Cal-Comp Inc., New Taipei City, TAIWAN
| | - J Chien
- Healthcare and Beauty RD Center,Kinpo Electronics Inc., New Taipei City, TAIWAN
| | - K Haraikawa
- Healthcare and Beauty RD Center,Kinpo Electronics Inc., New Taipei City, TAIWAN
| | - M F Abbod
- Department of Electronic and Computer Engineering, Brunel University London, Uxbridge, UNITED KINGDOM
| | - J Shieh
- Department of Mechanical Engineering and Innovation Center for Big Data and Digital Convergence, Yuan Ze University, Taoyuan, TAIWAN
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Chen Y, Hsieh F, Hsieh Y, Jeng J, Lien L, Lin H, Hu C, Peng G, Chern C, Chen C, Tang S, Chi N, Sung Y, Chiou H. Significant association between genetic polymorphisms of gckr and glut1, and ischemic stroke. Atherosclerosis 2014. [DOI: 10.1016/j.atherosclerosis.2014.05.203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Hsieh Y, Peterson S, Gauvey-Kern M, Gaydos CA, Holtgrave D, Rothman RE. P5.023 Novel Emergency Department Registration Kiosk For HIV Screening Increases Engagement of High Risk Patients and is Cost-Effective. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.1068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Rompalo AM, Hsieh Y, Guy R, Natoli L, Fairley C, Gupta S, Radcliffe K, Hogan MT, Goheen MJ, Gaydos C. P5.083 What Qualities Do Providers Identify as Best For Point of Care STI Tests and Do Opinions Differ by Practise, Region and Country? Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.1127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Hsieh Y, Beck K, Kelen G, Shahan J, Kraus C, Laeyendecker O, Quinn T, Rothman R. P5.027 High Prevalence of Undiagnosed HIV Infection in Patients Who Were Not Offered Screening and Patients Who Declined Screening: Evaluation of a Rapid HIV Screening Programme in a U.S. Urban Emergency Department. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.1072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Hsueh C, Chang P, Hsieh Y, Chen P, Lin S. Paradoxical Proarrhythmic Effect of Blocking the Small Conductance CalciumActivated Potassium Channel in Isolated Canine Left Atrium. Heart Rhythm 2012. [DOI: 10.1016/j.hrthm.2012.09.104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Leung F, Cheung R, Fan R, Fischer L, Friedland S, Ho S, Hsieh Y, Hung I, Li M, Matsui S, McQuaid K, Ohning G, Ojuri A, Sato T, Shergill A, Shoham M, Simons T, Walter M, Yen A. The water exchange method for colonoscopy-effect of coaching. J Interv Gastroenterol 2012; 2:122-125. [PMID: 23805391 DOI: 10.4161/jig.23732] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 06/05/2012] [Accepted: 06/07/2012] [Indexed: 02/07/2023]
Abstract
The growing popularity of water immersion is supported by its long history as an adjunct to air insufflation; after facilitating colonoscope passage, the infused water is conveniently removed during withdrawal. Water exchange, a modification of water immersion to minimize discomfort in scheduled unsedated patients in the U.S. is new. Even though it may be superior in reducing pain and increasing adenoma detection, the paradigm shift to complete exclusion of air during insertion necessitates removal of infused water containing residual feces, a step often perceived as laborious and time-consuming. The nuances are the efficient steps to remove infused water predominantly during insertion to maintain minimal distension and deliver salvage cleansing. Mastery of the novel maneuvers with practice returns insertion time towards baseline. In this observational study the impact of direct verbal coaching on the primary outcome of intention-to-treat cecal intubation was assessed. The results showed that 14 of 19 (74%) experienced colonoscopists achieved 100% intention-to-treat cecal intubation. Initiation of the examination with water exchange did not preclude completion when conversion to the more familiar air insufflation method was deemed necessary to achieve cecal intubation (total 98%). The overall intention-to-treat cecal intubation rate was 88%, 90% in male and 87% in female. Only 2.7% of bowel preparation was rated as poor during withdrawal. The mean volume of water infused and cecal intubation time was 1558 ml and 18 min, respectively. Direct coaching appears to facilitate understanding of the nuances of the water exchange method. Studies of individual learning curves are necessary.
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Affiliation(s)
- Fw Leung
- Gastroenterology, Sepulveda ACC, VAGLAHS, North Hills, CA, United States ; Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
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Shah S, Rothman R, Pitts S, Peng J, Hsieh Y. 214 Temporal Trends in Noncontrast Head Computed Tomography Findings in HIV Positive Emergency Department Patients 1998-2009. Ann Emerg Med 2011. [DOI: 10.1016/j.annemergmed.2011.06.243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Leung F, Harker J, Leung J, Siao-Salera R, Mann S, Ramirez F, Friedland S, Amato A, Radaelli F, Paggi S, Terruzzi V, Hsieh Y. Removal of infused water predominantly during insertion (water exchange) is consistently associated with an increase in adenoma detection rate - review of data in randomized controlled trials (RCTs) of water-related methods. J Interv Gastroenterol 2011; 1:121-126. [PMID: 22163082 DOI: 10.4161/jig.1.3.18517] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Revised: 06/18/2011] [Accepted: 06/20/2011] [Indexed: 02/06/2023]
Abstract
INTRODUCTION: Variation in outcomes in RcTs comparing water-related methods and air insufflation raises challenging questions regarding the new approach. This report reviews impact of water exchange - simultaneous infusion and removal of infused water during insertion on adenoma detection rate (ADR) defined as proportion of patients with a least one adenoma of any size. METHODS: Medline (2008-2011) searches, abstract of 2011 Digestive Disease Week (DDW) meeting and personal communications were considered to identify RcTs that compared water-related methods and air insufflation to aid insertion of colonoscope. RESULTS: Since 2008, eleven reports of RcTs (6 published, 1 submitted and 4 abstracts, n=1728) described ADR in patients randomized to be examined by air and water-related methods. The water-related methods differed in timing of removal of the infused water -predominantly during insertion (water exchange) (n=825) or predominantly during withdrawal (water immersion) (n=903). Water immersion was associated with both increases and decreases in ADR compared to respective air method patients and the net overall change (-7%) was significant. On the other hand water exchange was associated with increases in ADR consistently and the net changes (overall, 8%; proximal overall, 11%; and proximal <10 mm, 12%) were all significant. CONCLUSION: Comparative data generated the hypothesis that significantly larger increases in overall and proximal colon ADRs were associated with water exchange than water immersion or air insufflation during insertion. The hypothesis should be evaluated by RCTs to elucidate the mechanism of water exchange on adenoma detection.
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Affiliation(s)
- Fw Leung
- Sepulveda ACC, VAGLAHS, North Hill, CA, USA
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Leung F, Harker J, Leung J, Siao-Salera R, Mann S, Ramirez F, Friedland S, Amato A, Radaelli F, Paggi S, Terruzzi V, Hsieh Y. Removal of infused water predominantly during insertion (water exchange) is consistently associated with a greater reduction of pain score - review of randomized controlled trials (RCTs) of water method colonoscopy. J Interv Gastroenterol 2011; 1:114-120. [PMID: 22163081 DOI: 10.4161/jig.1.3.18510] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 05/29/2011] [Accepted: 06/03/2011] [Indexed: 02/06/2023]
Abstract
INTRODUCTION: Variation in the outcomes in RcTs comparing water-related methods and air insufflation during the insertion phase of colonoscopy raises challenging questions regarding the approach. This report reviews the impact of water exchange on the variation in attenuation of pain during colonoscopy by water-related methods. METHODS: Medline (2008 to 2011) searches, abstracts of the 2011 Digestive Disease Week (DDW) and personal communications were considered to identify RcTs that compared water-related methods and air insufflation to aid insertion of the colonoscope. Results: Since 2008 nine published and one submitted RcTs and five abstracts of RcTs presented at the 2011 DDW have been identified. Thirteen RcTs (nine published, one submitted and one abstract, n=1850) described reduction of pain score during or after colonoscopy (eleven reported statistical significance); the remaining reports described lower doses of medication used, or lower proportion of patients experiencing severe pain in colonoscopy performed with water-related methods compared with air insufflation (Tables 1 and 2). The water-related methods notably differ in the timing of removal of the infused water - predominantly during insertion (water exchange) versus predominantly during withdrawal (water immersion). Use of water exchange was consistently associated with a greater attenuation of pain score in patients who did not receive full sedation (Table 3). CONCLUSION: The comparative data reveal that a greater attenuation of pain was associated with water exchange than water immersion during insertion. The intriguing results should be subjected to further evaluation by additional RcTs to elucidate the mechanism of the pain-alleviating impact of the water method.
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Affiliation(s)
- Fw Leung
- Sepulveda ACC, VAGLAHS, North Hill, CA; USA
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Chao T, Hsieh Y, Lee C, Tu S, Cheng H, Tung C. SU-E-J-67: Dual Resolution CT-Based Phantoms for Monte Carlo Simulation Against Small-Field Irradiations in Tiny/heterogeneous Tissues. Med Phys 2011. [DOI: 10.1118/1.3611835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Hsieh C, Liu C, Hsieh Y, Tai H, Wang L, Tsai T, Chen Y. Role of matrix metalloproteinase-8 in the modulation of systemic 5-fluorouracil pharmacokinetics by local irradiation. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.4_suppl.466] [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: 11/20/2022] Open
Abstract
466 Background: Concurrent chemoradiation with 5-fluorouracil (5-FU) is widely accepted for cancer treatment. However, the interactions between radiation and 5-FU remain unclear. We evaluated the influence of local irradiation on the pharmacokinetics of 5-FU in rats. Methods: The single-fraction radiation was delivered to the whole pelvic fields of Sprague-Dawley rats from a linear accelerator after computerized tomography-based planning. 5-FU at 100 mg/kg was intravenously infused 24 hours after radiation. A high-performance liquid chromatography system equipped with a UV detector was used to measure 5-FU in the blood. Matrix metalloproteinase-8 (MMP-8) inhibitor I was administered to the rats to examine whether or not RT modulation of 5-FU pharmacokinetic parameters could be blocked. Results: Compared with sham-irradiated controls, whole pelvic irradiation reduced the area under the concentration versus time curve (AUC) of 5-FU in plasma and, in contrast, increased the AUC in bile in a radiation dose-dependent manner. Based on protein array analysis, the amount of plasma MMP-8 was increased by whole pelvic irradiation (2.8-fold by 0.5 Gy and 5.3-fold by 2 Gy) in comparison with controls. Pretreatment with MMP-8 inhibitor reversed the effect of irradiation on AUC of 5-FU in plasma. Conclusions: Local irradiation may modulate the systemic pharmacokinetics of 5-FU through stimulating the release of MMP-8. This unexpected influence is worthy of further investigation and for consideration in clinical practice of radiotherapy for cancer. No significant financial relationships to disclose.
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Affiliation(s)
- C. Hsieh
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - C. Liu
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - Y. Hsieh
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - H. Tai
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - L. Wang
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - T. Tsai
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
| | - Y. Chen
- Far Eastern Memorial Hospital, Taipei, Taiwan; Mackay Memorial Hospital, Taipei, Taiwan; National Yang-Ming University, Taipei, Taiwan; National Taiwan University, Taipei, Taiwan
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Morton M, Kirsch T, Rothman R, Hsieh Y, Byerly M, McManus J, Kelen G. 391: The Impact of Emergency Department Size on Pandemic Influenza Preparedness in U.S. Emergency Departments. Ann Emerg Med 2009. [DOI: 10.1016/j.annemergmed.2009.06.430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kraus C, Shahan J, Hsieh Y, Rothman R, Oliver A, Gamiel J, Laeyendecker O, Quinn T, Kelen G. 41: Seroprevalence of HSV-2 Infection Among an Urban Emergency Department Patient Population. Ann Emerg Med 2008. [DOI: 10.1016/j.annemergmed.2008.06.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kraus C, Shahan J, Rothman R, Hsieh Y, Laeyendecker O, Oliver A, Gamiel J, Quinn T, Kelen G. 2: Twenty Years Experience With HIV Testing among Emergency Department Patients at the Johns Hopkins Hospital. Ann Emerg Med 2008. [DOI: 10.1016/j.annemergmed.2008.06.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Hsieh J, Hsieh Y. Eine neue Variante der einzeitigen Hypospadiekorrektur. Aktuelle Urol 2008. [DOI: 10.1055/s-2008-1061470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lovett P, Newman-Toker D, Stanton V, Hsieh Y, Camargo C, Edlow J, Goldstein J, Abbuhl S, Lin M, Chanmugam A, Rothman R. 33: Diagnosing Dizziness in the Emergency Department: Physicians May Rely Too Heavily on Symptom Quality. Results of a Multicenter, Quantitative Survey. Ann Emerg Med 2007. [DOI: 10.1016/j.annemergmed.2007.06.064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
In this study, we examined the gas-phase pyrolysis of ethyl N,N-dimethylcarbamate theoretically at various theoretical levels. The reaction consists of a two-step mechanism, with N,N-dimethylcarbamic acid and ethylene as reaction intermediates. In the first step, the reaction proceeds via a six-membered cyclic transition state (TS), which is more favorable than that via a four-membered cyclic TS. Here, the contribution of entropy to the overall potential energy surface was found to play an important role in determining the rate-limiting step, which was found to be the second step when viewed in terms of the enthalpy of activation (DeltaH(not equal)), but the first step when entropy changes (-TDeltaS(not equal)) were considered. These results are consistent with experimental findings. Moreover, the experimental activation entropy can be reproduced by using the hindered rotor approximation, which converts some low vibration frequencies that correspond to internal rotational modes into hindered rotors.
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Affiliation(s)
- Chang K Kim
- Department of Chemistry, Inha University, Incheon 402-751, Korea
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Yu H, Shimizu T, Hsieh Y, Suzuki T, Choudhry M, Bland K, Schwacha M, Chaudry I. Differential expression of tissue estrogen receptor subtype α and β and their role in the regulation of neutrophil infiltration following trauma-hemorrhage. J Surg Res 2006. [DOI: 10.1016/j.jss.2005.11.193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hsieh Y, Brisson JM, Ng K, White RE, Korfmacher WA. Direct simultaneous analysis of plasma samples for a drug discovery compound and its hydroxyl metabolite using mixed-function column liquid chromatography-tandem mass spectrometry. Analyst 2001; 126:2139-43. [PMID: 11814192 DOI: 10.1039/b105205p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [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: 11/21/2022]
Abstract
A polymer-coated mixed-function (PCMF) column was evaluated for direct plasma injection for the simultaneous determination of a drug candidate and its hydroxyl metabolite by high-performance liquid chromatography (HPLC) with tandem mass spectrometry (MS-MS) in support of pharmacokinetic studies. Each diluted monkey plasma sample containing internal standard was directly injected on to the PCMF column for sample clean-up, enrichment and chromatographic separation. The proteins and macromolecules were first eluted from the column while the drug molecules were retained on the bonded hydrophobic phase. The analytes retained on the column were then eluted with a strong mobile phase using a gradient separation technique at a constant flow rate of 1.0 ml min(-1). When not diverted, the column effluent was connected either to the atmospheric pressure chemical ionization (APCI) source or the electrospray ionization (ESI) source as part of the mass spectrometer system used for quantification. The calibration curve was linear over the range 5-2500 ng ml(-1) for both analytes. The retention times for the analytes and the internal standard were both consistent and no column deterioration was observed for at least 500 injections. The recovery through the column and reproducibility of the dosed compound and its hydroxyl metabolite in monkey plasma samples were > 90% (RSD < 6%). The total analysis time was < 8 min per sample. The analytical results obtained by the proposed direct plasma injection method were in good agreement with those obtained by the conventional LC-MS-MS method.
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Affiliation(s)
- Y Hsieh
- Drug Metabolism and Pharmacokinetics Department, Schering-Plough Research Institute, Kenilworth, NJ 07033, USA
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Abstract
A 20-year-old psychiatric patient receiving haloperidol treatment developed acute-onset fever, rigidity, and mental changes. Subcutaneous apomorphine was given alone for treatment. The patient had rapid clinical improvement after the treatment. Serial blood examinations showed decline and subsequent normalization of the creatine phosphokinase levels.
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Affiliation(s)
- H C Wang
- Department of Neurology, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan.
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Hsieh Y, Chintala M, Mei H, Agans J, Brisson JM, Ng K, Korfmacher WA. Quantitative screening and matrix effect studies of drug discovery compounds in monkey plasma using fast-gradient liquid chromatography/tandem mass spectrometry. Rapid Commun Mass Spectrom 2001; 15:2481-2487. [PMID: 11746920 DOI: 10.1002/rcm.479] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.8] [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 higher-throughput bioanalytical method based on fast-gradient (1 min run time) high-performance liquid chromatography (HPLC) coupled with tandem mass spectrometry (MS/MS) was developed for screen-type analyses of plasma samples from early drug discovery studies in support of exploratory pharmacodynamic studies. The HPLC system equipped with minibore column was interfaced with either atmospheric pressure chemical ionization (APCI) or electrospray (ESI) ionization techniques. The matrix ion suppression effect of both quantitative HPLC/MS/MS analyses was compared using the post-column infusion system. The use of the described methods provided advantages such as a shorter chromatographic region of ion suppression, less solvent consumption and shorter run times in comparison with standard analytical column HPLC/MS/MS methods. The analytical results obtained by both HPLC/MS/MS methods were in good agreement (within 15% of error) and displayed a good correlation with the pharmacodynamic outcome.
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Affiliation(s)
- Y Hsieh
- Drug Metabolism and Pharmacokinetics Department, Schering Plough Research Institute, Kenilworth, NJ 07033, USA
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Korfmacher WA, Cox KA, Ng KJ, Veals J, Hsieh Y, Wainhaus S, Broske L, Prelusky D, Nomeir A, White RE. Cassette-accelerated rapid rat screen: a systematic procedure for the dosing and liquid chromatography/atmospheric pressure ionization tandem mass spectrometric analysis of new chemical entities as part of new drug discovery. Rapid Commun Mass Spectrom 2001; 15:335-340. [PMID: 11241763 DOI: 10.1002/rcm.235] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.0] [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
This report addresses the continuing need for increased throughput in the evaluation of new chemical entities (NCEs) in terms of their pharmacokinetic (PK) parameters by describing an alternative procedure for increasing the throughput of the in vivo screening of NCEs in the oral rat PK model. The new approach is called "cassette-accelerated rapid rat screen" (CARRS). In this assay, NCEs are dosed individually (n = 2 rats/compound) in batches of six compounds per set. The assay makes use of a semi-automated protein precipitation procedure for sample preparation in a 96-well plate format. The liquid chromatography/atmospheric pressure ionization tandem mass spectrometry (LC/API-MS/MS) assay is also streamlined by analyzing the samples as "cassettes of six". Using this new approach, a threefold increase in throughput was achieved over the previously reported "rapid rat screen".
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Affiliation(s)
- W A Korfmacher
- Department of Drug Metabolism and Pharmacokinetics, Schering-Plough Research Institute, 2015 Galloping Hill Rd., Kenilworth, NJ 07033, USA.
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Abstract
OBJECTIVE To compare the empty zona pellucidae (ZP) of different species for use in the cryopreservation of spermatozoa. DESIGN Prospective study. SETTING An IVF unit of a medical center. PATIENT(S) Patients with azoospermia, oligoasthenozoospermia, or normal spermatozoa. INTERVENTION(S) Human and mouse ZP were prepared by evacuating the cytoplasm of oocytes or embryos. The evacuated ZP were injected with spermatozoa from patients with severe oligoasthenozoospermia and from healthy, fertile men. After the freezing and thawing procedure, the spermatozoa were aspirated outside the ZP. MAIN OUTCOME MEASURE(S) The number of spermatozoa per ZP, the number of motile sperm before freezing and after thawing, the number of sperm lost per ZP after freezing, and the sperm recovery rate were compared according to the different origins of the ZP and the sperm. RESULT(S) The number of spermatozoa, number of motile sperm before freezing and after thawing, number of sperm lost per ZP, and sperm recovery rate were comparable in all groups. The total mean number of motile sperm before freezing and after thawing, the mean number of nonmotile sperm after thawing, the mean number of sperm lost after thawing, and the sperm recovery rate were 14.5%, 11. 8%, 1.0%, 1.5%, and 82%, respectively. CONCLUSION(S) Zona pellucidae are an ideal vehicle for the cryopreservation of sperm collected by testicular sperm extraction or microsurgical epididymal sperm aspiration or from patients with severe oligoasthenozoospermia. There were no differences when human and mouse ZP were used for sperm storage.
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Affiliation(s)
- Y Hsieh
- Department of Obstetrics, China Medical College Hospital, Taichung, Taiwan
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Hsieh Y, Tsai H, Chang C, Lo H. Comparison of a single half-dose, long-acting form of gonadotropin-releasing hormone analog (GnRH-a) and a short-acting form of GnRH-a for pituitary suppression in a controlled ovarian hyperstimulation program. Fertil Steril 2000; 73:817-20. [PMID: 10731546 DOI: 10.1016/s0015-0282(99)00608-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [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: 10/16/2022]
Abstract
OBJECTIVE To compare the effect of a single low-dose leuprolide acetate depot (LA depot) and leuprolide acetate (LA) on pituitary down-regulation in women undergoing controlled ovarian hyperstimulation (COH). DESIGN Retrospective study. SETTING An IVF unit of an academic medical center. PATIENT(S) Women who underwent COH and IVF-ET. INTERVENTION(S) Pituitary down-regulation with half-dose LA depot (1.88 mg sc, group 1) or LA (0.5 mg/d sc, group 2) was started on menstrual days 21-23. MAIN OUTCOME MEASURE(S) The concentrations of estradiol (E(2)), FSH, LH, gonadotropin dosages, the numbers of oocytes retrieved, oocytes fertilized and embryos transferred, and pregnancy rates of the two groups were compared. RESULT(S) A total of 289 patients in group 1 and 158 in group 2 were included. There were no statistically significant differences between the two groups in baseline concentrations of E(2) and FSH, concentrations of E(2), FSH, and LH during hCG administration, gonadotropin dosage, the number of oocytes retrieved, the number of oocytes fertilized and embryos transferred, and pregnancy rates. CONCLUSION(S) Single half-dose LA depot offers a useful alternative for pituitary suppression in ovarian stimulation for IVF.
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Affiliation(s)
- Y Hsieh
- Department of Obstetrics and Gynecology, China Medical College Hospital, Taichung, Taiwan
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Abstract
Renal cell carcinoma is rarely seen in children and adolescents. Patients with widespread disease at diagnosis have a particularly poor survival rate. Currently, all known chemotherapy has been ineffective in improving the median survival in patients with advanced disease. A 13-year-old black boy with stage IV renal cell carcinoma with rhabdoid features is a long-term disease-free survivor after aggressive multiagent chemotherapy. After the initial evaluation and histologic diagnosis of renal cell carcinoma, the patient received three courses of an aggressive chemotherapy regimen consisting of vincristine, doxorubicin, cyclophosphamide with mesna uroprotection, granulocyte colony-stimulating factor and erythropoietin (Epogen). After an almost complete response, a radical nephrectomy was performed and results demonstrated a solitary small nodule with viable tumor. After surgery, he received floxuridine infusion for 14 days by circadian schedule at 28-day intervals for a total of 1 year. The patient is well and free of disease 5 years after initial presentation. The dramatic response to treatment and long-term disease-free survival of this patient suggest this chemotherapeutic approach warrants additional investigation.
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Affiliation(s)
- L J Ettinger
- Division of Pediatric Hematology-Oncology, Saint Peter's University Hospital: Cancer Institute of New Jersey, New Brunswick 08903-0591, USA
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Hsieh Y, Bryant MS, Gruela G, Brisson JM, Korfmacher WA. Direct analysis of plasma samples for drug discovery compounds using mixed-function column liquid chromatography tandem mass spectrometry. Rapid Commun Mass Spectrom 2000; 14:1384-1390. [PMID: 10920359 DOI: 10.1002/1097-0231(20000815)14:15<1384::aid-rcm32>3.0.co;2-#] [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] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A sensitive, efficient, high throughput, direct injection bioanalytical method based on a single column and high-performance liquid chromatography (HPLC) with tandem mass spectrometry (MS/MS) was developed for pharmacokinetic analysis of early drug discovery compounds in plasma samples. After mixing with a working solution containing an internal standard each plasma sample was directly injected into a polymer-coated mixed-function column for sample cleanup, enrichment and chromatographic separation. The stationary phase incorporates hydrophilic polyoxyethylene groups and hydrophobic groups to the polymer-coated silica. This allows proteins and macromolecules to pass through the column due to restricted access to the surface of the packing while retaining the drug molecules on the bonded hydrophobic phase. The analytes retained in the column with a largely aqueous liquid mobile phase were then chemically separated by switching to a strong organic mobile phase. The column effluent was diverted from waste to the mass spectrometer for analyte detection. Within 200 plasma sample injections the response ratio (analyte vs. internal standard, %CV = 4.6) and the retention times for analyte and internal standard were found consistent and no column deterioration was observed. The recoveries of test compound in various plasma samples were greater than 90%. The total analysis time was </=5 min per sample.
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Affiliation(s)
- Y Hsieh
- Drug Metabolism and Pharmacokinetics Department, Schering Plough Research Institute, Kenilworth, NJ 07033, USA
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Zhang Y, Hsieh Y, Izumi T, Lin ET, Benet LZ. Effects of ketoconazole on the intestinal metabolism, transport and oral bioavailability of K02, a novel vinylsulfone peptidomimetic cysteine protease inhibitor and a P450 3A, P-glycoprotein dual substrate, in male Sprague-Dawley rats. J Pharmacol Exp Ther 1998; 287:246-52. [PMID: 9765344] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
We investigated the effects of ketoconazole on the oral bioavailability of morpholine-urea-phenylalanine-homophenylalanine-vinylsulfone-phenyl (K02), a vinylsulfone peptidomimetic cysteine protease inhibitor, and a P450 3A (CYP3A) and P-glycoprotein dual substrate, in male Sprague-Dawley rats, so as to evaluate the roles of CYP3A and P-gp in K02 disposition. Male Sprague-Dawley rats (8-10 wk old, n = 3-6) were administered a single dose of K02 (10 mg/kg) i.v. or (30 mg/kg) p.o. with or without a concomitant oral dose of ketoconazole (20 mg/kg). Blood samples were collected from 2 min to 8 h after administration through a implanted jugular vein cannula. K02 plasma concentrations were determined by liquid chromatography/mass spectrometer/mass spectrometer analysis. Ketoconazole markedly raised the area under the curve of orally administered K02 from 9.4 +/- 4.4 to 102 +/- 24 mg . min/liter and decreased K02 oral plasma clearance from 3810 +/- 1620 to 306 +/- 60 ml/min/kg. With concomitant ketoconazole dosing, the changes of AUC of i.v. administered K02 (from 94 +/- 17 to 107 +/- 14 mg . min/liter) and clearance (from 110 +/- 22 to 95 +/- 13 ml/min/kg) were not significant, although K02 oral bioavailability increased from 2.9 +/- 1.4 to 31.0 +/- 7.5% (P < .001). In summary, ketoconazole, a dual inhibitor of CYP3A and P-glycoprotein, can effectively increase K02 oral bioavailability by inhibiting the CYP3A/P-gp absorption barrier in the small intestine.
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Affiliation(s)
- Y Zhang
- Department of Biopharmaceutical Sciences, School of Pharmacy, University of California, San Francisco, California, USA
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35
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Guan Y, Hickey MJ, Borgstahl GE, Hallewell RA, Lepock JR, O'Connor D, Hsieh Y, Nick HS, Silverman DN, Tainer JA. Crystal structure of Y34F mutant human mitochondrial manganese superoxide dismutase and the functional role of tyrosine 34. Biochemistry 1998; 37:4722-30. [PMID: 9537987 DOI: 10.1021/bi972394l] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Tyrosine 34 is a prominent and conserved residue in the active site of the manganese superoxide dismutases in organisms from bacteria to man. We have prepared the mutant containing the replacement Tyr 34 --> Phe (Y34F) in human manganese superoxide dismutase (hMnSOD) and crystallized it in two different crystal forms, orthorhombic and hexagonal. Crystal structures of hMnSOD Y34F have been solved to 1.9 A resolution in a hexagonal crystal form, denoted as Y34Fhex, and to 2.2 A resolution in an orthorhombic crystal form, denoted as Y34Fortho. Both crystal forms give structures that are closely superimposable with that of wild-type hMnSOD, with the phenyl rings of Tyr 34 in the wild type and Phe 34 in the mutant very similar in orientation. Therefore, in Y34F, a hydrogen-bonded relay that links the metal-bound hydroxyl to ordered solvent (Mn-OH to Gln 143 to Tyr 34 to H2O to His 30) is broken. Surprisingly, the loss of the Tyr 34 hydrogen bonds resulted in large increases in stability (measured by Tm), suggesting that the Tyr 34 hydroxyl does not play a role in stabilizing active-site architecture. The functional role of the side chain hydroxyl of Tyr 34 can be evaluated by comparison of the Y34F mutant with the wild-type hMnSOD. Both wild-type and Y34F had kcat/Km near 10(9) M-1 s-1, close to diffusion-controlled; however, Y34F showed kcat for maximal catalysis smaller by 10-fold than the wild type. In addition, the mutant Y34F was more susceptible to product inhibition by peroxide than the wild-type enzyme. This activity profile and the breaking of the hydrogen-bonding chain at the active site caused by the replacement Tyr 34 --> Phe suggest that Tyr 34 is a proton donor for O2* - reduction to H2O2 or is involved indirectly by orienting solvent or other residues for proton transfer. Up to 100 mM buffers in solution failed to enhance catalysis by either Y34F or the wild-type hMnSOD, suggesting that protonation from solution cannot enhance the release of the inhibiting bound peroxide ion, likely reflecting the enclosure of the active site by conserved residues as shown by the X-ray structures. The increased thermostability of the mutant Y34F and equal diffusion-controlled activity of Y34F and wild-type enzymes with normal superoxide levels suggest that evolutionary conservation of active-site residues in metalloenzymes reflects constraints from extreme rather than average cellular conditions. This new hypothesis that extreme rather than normal substrate concentrations are a powerful constraint on residue conservation may apply most strongly to enzyme defenses where the ability to meet extreme conditions directly affects cell survival.
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Affiliation(s)
- Y Guan
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA
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36
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Hsieh Y, Guan Y, Tu C, Bratt PJ, Angerhofer A, Lepock JR, Hickey MJ, Tainer JA, Nick HS, Silverman DN. Probing the active site of human manganese superoxide dismutase: the role of glutamine 143. Biochemistry 1998; 37:4731-9. [PMID: 9537988 DOI: 10.1021/bi972395d] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Structural and biochemical characterization of the nonliganding residue glutamine 143 near the manganese of human Mn superoxide dismutase (hMnSOD), a homotetramer of 22 kDa, reveals a functional role for this residue. In the wild-type protein, the side-chain amide group of Gln 143 is about 5 A from the metal and is hydrogen-bonded to Tyr 34, which is a second prominent side chain adjacent to the metal. We have prepared the site-specific mutant of hMnSOD with the conservative replacement of Gln 143 --> Asn (Q143N). The crystal structure of Q143N shows that the side-chain amide nitrogen of residue 143 is 1.7 A more distant from the manganese than in the wild-type enzyme. The Tyr 34 side-chain hydroxyl in Q143N is also moved to become 0.6 A more distant from the metal due to an additional water molecule. Differential scanning calorimetry showed that Q143N is slightly more stable than the wild-type enzyme with Tm for the main unfolding transition increased by 2 degrees C to 90.7 degrees C. Pulse radiolysis and stopped-flow spectrophotometry reveal that unlike wild-type hMnSOD, which is strongly inhibited by peroxide, Q143N MnSOD exhibits no product inhibition even at concentrations of O2. - in the millimolar range, and its catalysis follows Michaelis kinetics with no evidence of cooperativity. However, the overall catalytic activity of this mutant was decreased 2-3 orders of magnitude compared with the wild-type MnSOD, which can account for its lack of product inhibition. Q143N MnSOD lacked the visible absorption spectrum typical of wild-type Mn(III)SOD. Also, unlike the wild-type Mn(III)SOD, which is electron paramagnetic resonance (EPR) silent, Q143N MnSOD has a complex EPR spectrum with many resonances in the region below 2250 G. We conclude that the Gln 143 --> Asn mutation has increased the reduction potential of manganese to stabilize Mn(II), indicating that Gln 143 has a substantial role in maintaining a reduction potential favorable for the oxidation and reduction cycles in the catalytic disproportionation of superoxide. A solvent hydrogen isotope effect near 2 for kcat in catalysis by Q143N hMnSOD indicates rate-contributing proton transfers to form product hydroperoxide anion or hydrogen peroxide. The data demonstrate a prominent role for Gln 143 in maintaining the microenvironment of the manganese and in efficient catalysis of superoxide dismutation to oxygen and hydrogen peroxide.
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Affiliation(s)
- Y Hsieh
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, Florida 32610, USA
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37
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Chen C, Kao C, Hsieh Y, Gu C. Tissue polypeptide specific antigen for early prediction of non-small cell lung cancer recurrence. Oncol Rep 1997; 4:1391-4. [PMID: 21590259 DOI: 10.3892/or.4.6.1391] [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: 11/05/2022] Open
Abstract
TPS is a new tumor marker immunoassay that indicates tumor proliferative rate rather than tumor burden. Thirty-nine patients with non-small cell lung cancer (NSCLC), including 18 cases with recurrence and 21 cases without recurrence 1 year postoperation, were enrolled in this study. The serial serum levels of tissue polypeptide specific antigen (TPS) were measured before operation and 1 week, 4 weeks, 3 months, 6 months, 9 months, and 12 months after operation, using an immunoradiometric assay (IRMA), for early detection of recurrence. The results revealed that mean serum values of TPS were higher in 18 patients with recurrent cancer (103.5, 69.2, 88.1, 137.0, 108.6, 170.5, and 106.3 U/l) when compared with 21 patients without recurrent cancer (86.7, 53.0, 54.5, 57.4, 52.3, 52.0, and 58.6 U/l), preoperation and at all times after operation. If the TPS serum level 1 week after operation was considered as the baseline level (1x), elevated TPS ratios were higher in 18 patients with recurrence (1.2x, 2.5x, 2.1x, 4.3x, and 3.0x) when compared with 21 patients without recurrence (1.1x, 1.1x, 1.0x, 1.0x, and 1.1x), 4 weeks to 12 months after operation. We conclude that TPS is a suitable marker for early prediction of NSCLC recurrence. Patients with recurrent NSCLC within 1 year postoperation showed higher serum TPS levels and elevated TPS ratios than patients without recurrent NSCLC.
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Affiliation(s)
- C Chen
- TAICHUNG VET GEN HOSP,DEPT NUCL MED,TAICHUNG 40705,TAIWAN. TAICHUNG VET GEN HOSP,DIV THORAC SURG,TAICHUNG 40705,TAIWAN. CHUNG SHAN MED COLL,TAICHUNG 40705,TAIWAN. CHINA MED COLL,TAICHUNG 40705,TAIWAN
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38
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Abstract
The depletion of superoxide catalyzed by human manganese superoxide dismutase (MnSOD) was observed spectrophotometrically by measuring the absorbance of superoxide at 250-280 nm following pulse radiolysis and by stopped-flow spectrophotometry. Catalysis showed an initial burst of activity lasting approximately 1 ms followed by the rapid emergence of a greatly inhibited catalysis of zero-order rate. These catalytic properties of human MnSOD are qualitatively similar to those reported for MnSOD from Thermus thermophilus (Bull, C., Niederhoffer, E. C., Yoshida, T., and Fee, J. A.(1991) J. Am. Chem. Soc. 113, 4069-4076). However, there are significant quantitative differences; the emergence of the inhibited form is approximately 30-fold more rapid for human MnSOD. The turnover number for human MnSOD at pH 9.4 and 20 degrees C was kcat = 4 x 10(4) s-1 and kcat/Km = 8 x 10(8) M-1 s-1, determined by a simulated fit of the model of Bull et al. (1991) to the pulse radiolysis data. We also report that the maximum of the visible absorption spectrum of human MnSOD (epsilon480 = 525 M-1 cm-1) showed a strong dependence on pH that could be described by an ionization of pKa 9.4 +/- 0.1 with a maximum at low pH.
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Affiliation(s)
- J L Hsu
- Department of Pharmacology, University of Florida College of Medicine, Gainesville, Florida 32610-0267, USA
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39
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Hsieh Y. Optimal estimate of population age structure with varying vital rates. Math Popul Stud 1992; 3:289-299. [PMID: 12343720 DOI: 10.1080/08898489209525347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The author presents a method for estimating the age distribution of a population under varying vital statistics. "Some mathematical aspects of the method, as well as its applicability, will be discussed and numerical simulation will be run to illustrate the results and to compare the method with the traditional estimate of stable population theory...."
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Hsieh Y. [[The effect of demographic structural change on labor utilization in Taiwan]]. Ingu munje nonjip 1991:1-27. [PMID: 12222441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
"The purpose of this study is to examine the effect of demographic structural change on labor utilization in Taiwan.... Both purging method and decomposing rate differences method are used to analyze labor utilization data obtained from reports on the Manpower Utilization Survey from 1980 to 1989. The results suggest that the age-sex composition change of labor force from 1980 to 1989 pushed down the crude rate of labor underutilization in the labor market; the education-sex composition change pulled up crude rate of underutilization; and marital status-sex composition change also pushed down crude underutilization rate. In sum, the demographic structural change of labor force in Taiwan does have [an] obvious impact on labor utilization." (SUMMARY IN ENG)
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Hsieh Y. [[The effect of age-sex composition change in the labor force on inadequate labor utilization in Taiwan]]. Ingu munje nonjip 1990:59-82. [PMID: 12222480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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42
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Kwan CK, Hsieh Y, Kauppila WE, Smith SJ, Stein TS, Uddin MN, Dababneh MS. Erratum: e+/--CO and e+/--CO2 total cross-section measurements. Phys Rev A Gen Phys 1989; 39:2752. [PMID: 9920582 DOI: 10.1103/physreva.39.2752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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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43
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Dababneh MS, Hsieh Y, Kauppila WE, Kwan CK, Smith SJ, Stein TS, Uddin MN. Total-cross-section measurements for positron and electron scattering by O2, CH. Phys Rev A Gen Phys 1988; 38:1207-1216. [PMID: 9900493 DOI: 10.1103/physreva.38.1207] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [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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44
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Hyder GM, Dababneh MS, Hsieh Y, Kauppila WE, Kwan CK, Mahdavi-Hezaveh M, Stein TS. Positron differential elastic-scattering cross-section measurements for argon. Phys Rev Lett 1986; 57:2252-2255. [PMID: 10033675 DOI: 10.1103/physrevlett.57.2252] [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: 05/23/2023]
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45
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Stein TS, Gomez RD, Hsieh Y, Kauppila WE, Kwan CK, Wan YJ. Total cross-section measurements for positrons and electrons colliding with potassium. Phys Rev Lett 1985; 55:488-491. [PMID: 10032366 DOI: 10.1103/physrevlett.55.488] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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