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Nguyen TAH, Ngo HH, Guo WS, Nguyen TT, Vu ND, Soda S, Nguyen THH, Nguyen MK, Tran TVH, Dang TT, Nguyen VH, Cao TH. White hard clam (Meretrix lyrata) shells as novel filter media to augment the phosphorus removal from wastewater. Sci Total Environ 2020; 741:140483. [PMID: 32615439 DOI: 10.1016/j.scitotenv.2020.140483] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 06/20/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
It is well recognized that filter media play a crucial role in constructed wetlands (CWs) for decontamination of phosphorus (P)-rich wastewater. This study investigates the suitability of raw white hard clam shells (WHC) and white hard clam shells thermally modified at 800 °C (WHC-M800) as potential media to enhance P treatment performance in CWs. The results indicated that both WHC and WHC-M800 displayed appropriate physicochemical properties, such as high porosity, excellent hydraulic conductivity, and rich Ca content. WHC-M800 exhibited a superior P adsorption capacity (38.7 mg/g) to WHC (12.8 mg/g). However, the practical utilization of WHC-M800 as filter media in CWs may be compromised, due to certain limitations, for example: extremely high pH values in the post-adsorption solutions; high weight losses during calcination and adsorption processes; low mechanical strength; and intensive energy consumption. In contrast, the WHC demonstrated significant advantages of reasonably high P adsorption capacity, locally abundant availability, low cost, and marginal side effects. The fractionation of inorganic P of WHC and WHC-M800 revealed that Ca-bounded P was the most dominant binding form, followed by loosely bound P, Fe-P, occluded P, and Al-P. The present study demonstrates that recycling of WHC shells as a potential substrate in CWs provides a feasible method for upgrading P removal in CWs. Additionally, it helps to reduce waste WHC shells in a simple, cheap, and eco-friendly way, thus can double environmental benefits.
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Affiliation(s)
- T A H Nguyen
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - H H Ngo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney, Broadway NSW 2007, Australia.
| | - W S Guo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney, Broadway NSW 2007, Australia
| | - T T Nguyen
- Graduate School of Science and Engineering, Ritsumeikan University (RITs), Biwako-Kusatsu Campus, Shiga 525-8577, Japan
| | - N D Vu
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam; Center for Environmental Technology and Sustainable Development, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - S Soda
- Graduate School of Science and Engineering, Ritsumeikan University (RITs), Biwako-Kusatsu Campus, Shiga 525-8577, Japan
| | - T H H Nguyen
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - M K Nguyen
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - T V H Tran
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - T T Dang
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - V H Nguyen
- Research Center for Environmental Monitoring and Modeling, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - T H Cao
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam; Center for Environmental Technology and Sustainable Development, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
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Ha Vuong TM, Villemin D, Nguyen HH, Le TT, Dang TT, Nguyen H. Cover Feature: Programmed Site-Selective Palladium-Catalyzed Arylation of Thieno[3,2 -b
]thiophene (Chem. Asian J. 21/2017). Chem Asian J 2017. [DOI: 10.1002/asia.201700855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- T. M. Ha Vuong
- Faculty of Applied Sciences; Ton Duc Thang University; 19 Nguyen Huu Tho Street, Tan Phong Ward, District 7 Ho Chi Minh City Vietnam
- LCMT, UMR 6507, ENSICAEN; Normandie Université France; 6 bd Maréchal Juin 14000 Caen Cedex France
| | - Didier Villemin
- LCMT, UMR 6507, ENSICAEN; Normandie Université France; 6 bd Maréchal Juin 14000 Caen Cedex France
| | - Hung-Huy Nguyen
- Department of Chemistry; VNU-Hanoi University of Science; 19 Le Thanh Tong Street Ha Noi Vietnam
| | - Tin Thanh Le
- Faculty of Chemistry; Hochiminh National University of Education; 280 An Duong Vuong Hochiminh Vietnam
| | - Tung T. Dang
- Faculty of Applied Sciences; Ton Duc Thang University; 19 Nguyen Huu Tho Street, Tan Phong Ward, District 7 Ho Chi Minh City Vietnam
- COBRA UMR 6014 Batiment IRCOF; Normandie Université France; 1 Rue Tesniere 76821 Mont St Aignan Cedex France
| | - Hien Nguyen
- Division of Organic Chemistry; Faculty of Chemistry; Hanoi National University of Education; 136 Xuan Thuy, Cau Giay Ha Noi Vietnam
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Ha Vuong TM, Villemin D, Nguyen HH, Le TT, Dang TT, Nguyen H. Programmed Site-Selective Palladium-Catalyzed Arylation of Thieno[3,2-b
]thiophene. Chem Asian J 2017; 12:2819-2826. [DOI: 10.1002/asia.201700562] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 05/24/2017] [Indexed: 01/01/2023]
Affiliation(s)
- T. M. Ha Vuong
- Faculty of Applied Sciences; Ton Duc Thang University; 19 Nguyen Huu Tho Street, Tan Phong Ward, District 7 Ho Chi Minh City Vietnam
- LCMT, UMR 6507, ENSICAEN; Normandie Université France; 6 bd Maréchal Juin 14000 Caen Cedex France
| | - Didier Villemin
- LCMT, UMR 6507, ENSICAEN; Normandie Université France; 6 bd Maréchal Juin 14000 Caen Cedex France
| | - Hung-Huy Nguyen
- Department of Chemistry; VNU-Hanoi University of Science; 19 Le Thanh Tong Street Ha Noi Vietnam
| | - Tin Thanh Le
- Faculty of Chemistry; Hochiminh National University of Education; 280 An Duong Vuong Hochiminh Vietnam
| | - Tung T. Dang
- Faculty of Applied Sciences; Ton Duc Thang University; 19 Nguyen Huu Tho Street, Tan Phong Ward, District 7 Ho Chi Minh City Vietnam
- COBRA UMR 6014 Batiment IRCOF; Normandie Université France; 1 Rue Tesniere 76821 Mont St Aignan Cedex France
| | - Hien Nguyen
- Division of Organic Chemistry; Faculty of Chemistry; Hanoi National University of Education; 136 Xuan Thuy, Cau Giay Ha Noi Vietnam
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Dang TT, Durot S, Monnereau L, Heitz V, Barbieri A, Ventura B. Highlight on the solution processes occurring on silver(i)-assembling porphyrins in the presence of an excess of silver salt. Dalton Trans 2017; 46:9375-9381. [PMID: 28686279 DOI: 10.1039/c7dt00974g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Coordination cages obtained upon complexation of pyridyl functionalized porphyrins by Ag+ disassemble when overtaking a 1 : 2 stoichiometric amount of silver salt. An excess of Ag+ then leads to unusual chemical processes, here analyzed in detail, which permanently transform the monomeric porphyrins. The observed processes, discussed with reference to model compounds devoid of polyether substituted pyridyl residues, evidence a peculiar reactivity for meso 2,6-dimethylphenyl substituted porphyrins.
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Affiliation(s)
- T T Dang
- Laboratoire de Synthèse des Assemblages Moléculaires Multifonctionnels, Institut de Chimie de Strasbourg, CNRS/UMR 7177, 4, rue Blaise Pascal, 67000 Strasbourg, France. and Faculty of Applied Sciences, Ton Duc Thang University, 19 Nguyen Huu Tho Street, Tan Phong Ward, District 7, Ho Chi Minh City, 700000, Vietnam
| | - S Durot
- Laboratoire de Synthèse des Assemblages Moléculaires Multifonctionnels, Institut de Chimie de Strasbourg, CNRS/UMR 7177, 4, rue Blaise Pascal, 67000 Strasbourg, France.
| | - L Monnereau
- Laboratoire de Synthèse des Assemblages Moléculaires Multifonctionnels, Institut de Chimie de Strasbourg, CNRS/UMR 7177, 4, rue Blaise Pascal, 67000 Strasbourg, France.
| | - V Heitz
- Laboratoire de Synthèse des Assemblages Moléculaires Multifonctionnels, Institut de Chimie de Strasbourg, CNRS/UMR 7177, 4, rue Blaise Pascal, 67000 Strasbourg, France.
| | - A Barbieri
- Istituto ISOF-CNR, Via P. Gobetti 101, 40129 Bologna, Italy.
| | - B Ventura
- Istituto ISOF-CNR, Via P. Gobetti 101, 40129 Bologna, Italy.
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Dang TT, Soulé J, Doucet H, Benmensour MA, Boucekkine A, Colombo A, Dragonetti C, Righetto S, Jacquemin D, Boixel J, Guerchais V. Asymmetrical 1,3‐Bis(heteroazolyl)benzene Platinum Complexes with Tunable Second‐Order Non‐Linear Optical Properties. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600675] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Tung T. Dang
- UMR 6226 CNRS‐Université de Rennes 1 Institut des Sciences Chimiques de Rennes Campus de Beaulieu 35042 Rennes France
| | - Jean‐François Soulé
- UMR 6226 CNRS‐Université de Rennes 1 Institut des Sciences Chimiques de Rennes Campus de Beaulieu 35042 Rennes France
| | - Henri Doucet
- UMR 6226 CNRS‐Université de Rennes 1 Institut des Sciences Chimiques de Rennes Campus de Beaulieu 35042 Rennes France
| | - Mohamed Ali Benmensour
- UMR 6226 CNRS‐Université de Rennes 1 Institut des Sciences Chimiques de Rennes Campus de Beaulieu 35042 Rennes France
- Département de Chimie Faculté des Sciences Université Mouloud Mammeri 15000 Tizi‐Ouzou Algeria
| | - Abdou Boucekkine
- UMR 6226 CNRS‐Université de Rennes 1 Institut des Sciences Chimiques de Rennes Campus de Beaulieu 35042 Rennes France
| | - Alessia Colombo
- Dipartimento di Chimica dell'Universita degli Studi di Milano UdR dell'INSTM 20133 Milano Italy
| | - Claudia Dragonetti
- Dipartimento di Chimica dell'Universita degli Studi di Milano UdR dell'INSTM 20133 Milano Italy
| | - Stefania Righetto
- Dipartimento di Chimica dell'Universita degli Studi di Milano UdR dell'INSTM 20133 Milano Italy
| | - Denis Jacquemin
- UMR CNRS 6230 Université de Nantes, CEISAM 44322 Nantes Cedex 3 France
- Institut Universitaire de France (IUF) Faculté des Sciences 1, rue Descartes 75231 Paris Cedex 05 France
| | - Julien Boixel
- UMR 6226 CNRS‐Université de Rennes 1 Institut des Sciences Chimiques de Rennes Campus de Beaulieu 35042 Rennes France
| | - Véronique Guerchais
- UMR 6226 CNRS‐Université de Rennes 1 Institut des Sciences Chimiques de Rennes Campus de Beaulieu 35042 Rennes France
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Dang TT, Majumdar SR, Marrie TJ, Eurich DT. Recurrent pneumonia: a review with focus on clinical epidemiology and modifiable risk factors in elderly patients. Drugs Aging 2016; 32:13-9. [PMID: 25491559 DOI: 10.1007/s40266-014-0229-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [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: 12/15/2022]
Abstract
Community-acquired pneumonia (CAP) is one of the most common reasons for physician visits and hospitalizations in North America. Rates of CAP increase with age and CAP is associated with significant morbidity and mortality, especially in the elderly. Though there is much written about the epidemiology and risk factors of incident (first episode) pneumonia, much less is known about recurrent pneumonia. Rates of recurrent pneumonia within 3-5-years of an episode of CAP are 9-12% with a median time to recurrence of 123-317 days and mortality ranging from 4 to 10%. Age ≥65-years-old and impaired functional status are the only patient characteristics that are independently associated with increased risk of recurrence. In terms of modifiable risk factors, only the use of proton-pump inhibitors and systemic and inhaled corticosteroids have consistently been associated with increased risk of recurrent pneumonia, while angiotensin-converting enzyme (ACE) inhibitors may exert a protective effect. Many chronic medical conditions typically associated with increased incident pneumonia-such as chronic obstructive pulmonary disease (COPD), neurological disease (resulting in dysphagia or silent aspiration), and heart failure-were not associated with increased risk of recurrent pneumonia. However, those who are immune-suppressed (e.g., immunoglobulin deficiencies) may be at increased risk of recurrent pneumonia. In summary, among those who survive an episode of pneumonia, recurrence is not uncommon, particularly in the elderly. Following recovery from an episode of pneumonia, patients should be evaluated for risk factors that would predispose to a second episode including seeking evidence of immunosuppression in younger patients and medication optimization, particularly in the elderly.
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Affiliation(s)
- T T Dang
- Department of Medicine, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
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Dang TT, Bonneau M, Gareth Williams JA, Le Bozec H, Doucet H, Guerchais V. Pd-Catalyzed Functionalization of the Thenoyltrifluoroacetone Coligands by Aromatic Dyes in Bis(cyclometallated) IrIIIComplexes: From Phosphorescence to Fluorescence? Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500227] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Vu HX, Schneider M, Bentrup U, Dang TT, Phan BMQ, Nguyen DA, Armbruster U, Martin A. Hierarchical ZSM-5 Materials for an Enhanced Formation of Gasoline-Range Hydrocarbons and Light Olefins in Catalytic Cracking of Triglyceride-Rich Biomass. Ind Eng Chem Res 2015. [DOI: 10.1021/ie504519q] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hoan X. Vu
- Leibniz Institute for Catalysis e.V. at the University of Rostock, Albert Einstein Str. 29a, 18059 Rostock, Germany
- Vietnam Petroleum Institute, 167 Trung Kinh, Yen Hoa, Cau Giay, Hanoi, Vietnam
| | - Matthias Schneider
- Leibniz Institute for Catalysis e.V. at the University of Rostock, Albert Einstein Str. 29a, 18059 Rostock, Germany
| | - Ursula Bentrup
- Leibniz Institute for Catalysis e.V. at the University of Rostock, Albert Einstein Str. 29a, 18059 Rostock, Germany
| | - Tung T. Dang
- Vietnam Petroleum Institute, 167 Trung Kinh, Yen Hoa, Cau Giay, Hanoi, Vietnam
| | - Binh M. Q. Phan
- Vietnam Petroleum Institute, 167 Trung Kinh, Yen Hoa, Cau Giay, Hanoi, Vietnam
| | - Duc A. Nguyen
- Vietnam Petroleum Institute, 167 Trung Kinh, Yen Hoa, Cau Giay, Hanoi, Vietnam
| | - Udo Armbruster
- Leibniz Institute for Catalysis e.V. at the University of Rostock, Albert Einstein Str. 29a, 18059 Rostock, Germany
| | - Andreas Martin
- Leibniz Institute for Catalysis e.V. at the University of Rostock, Albert Einstein Str. 29a, 18059 Rostock, Germany
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Nguyen H, Nguyen Bich N, Dang TT, Van Meervelt L. Stacking patterns of thieno[3,2-b]thiophenes functionalized by sequential palladium-catalyzed Suzuki and Heck cross-coupling reactions. Acta Crystallogr C Struct Chem 2014; 70:895-9. [PMID: 25186364 DOI: 10.1107/s2053229614018683] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 08/18/2014] [Indexed: 11/10/2022]
Abstract
The crystal structures of three 5-alkenyl-2-arylthieno[3,2-b]thiophenes, namely 3,6-dibromo-5-(4-tert-butylstyryl)-2-(naphthalen-1-yl)thieno[3,2-b]thiophene, C(28)H(22)Br(2)S(2), (I), 3,6-dibromo-5-(4-methylstyryl)-2-(naphthalen-1-yl)thieno[3,2-b]thiophene, C(25)H(16)Br(2)S(2), (II), and 3,6-dibromo-2-(4-tert-butylphenyl)-5-(4-methylstyryl)thieno[3,2-b]thiophene, C(25)H(22)Br(2)S(2), (III), have been determined in order to evaluate the geometry of the molecules. The π-conjugated system containing the thieno[3,2-b]thiophene skeleton, the ethylene bridge and the phenyl rings is almost planar. The aromatic ring directly attached to the thieno[3,2-b]thiophene moiety is not coplanar with the thieno[3,2-b]thiophene moiety itself due to steric hindrance of the bromo substituent. The crystal packings are characterized by π-π stacking [only for (II)] and C-Br...π interactions. The long axes of the molecules in (I) are oriented in two directions; for the two other structures the long axis is oriented in one direction only.
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Affiliation(s)
- Hien Nguyen
- Chemistry Department, Hanoi National University of Education, 136-Xuan Thuy-Cau Giay, Hanoi, Vietnam
| | - Ngan Nguyen Bich
- Chemistry Department, Hanoi National University of Education, 136-Xuan Thuy-Cau Giay, Hanoi, Vietnam
| | - Tung T Dang
- Centre d'Élaboration de Matériaux et d'Études Structurales, 29 rue Jeanne Marvig BP 94347, 31055 Toulouse Cedex 4, France
| | - Luc Van Meervelt
- Chemistry Department, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven (Heverlee), Belgium
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Durot S, Flamigni L, Taesch J, Dang TT, Heitz V, Ventura B. Synthesis and Solution Studies of Silver(I)-Assembled Porphyrin Coordination Cages. Chemistry 2014; 20:9979-90. [DOI: 10.1002/chem.201402047] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Indexed: 11/10/2022]
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Dang TT, Eurich DT, Weir DL, Marrie TJ, Majumdar SR. Rates and risk factors for recurrent pneumonia in patients hospitalized with community-acquired pneumonia: population-based prospective cohort study with 5 years of follow-up. Clin Infect Dis 2014; 59:74-80. [PMID: 24729503 DOI: 10.1093/cid/ciu247] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND The rates and risk factors for developing recurrent pneumonia following hospitalization with community-acquired pneumonia (CAP) are poorly understood. METHODS We examined a population-based cohort of patients with CAP who survived hospital admission and who were free of pneumonia for at least 3 months. We collected clinical, functional, and medication-related information and pneumonia severity index (PSI). Using linked databases we followed patients for 5 years and captured any clinical episode of pneumonia 90 days or more post-discharge. We used Cox proportional hazards models (adjusted for age, sex, PSI, functional status, medications) to determine rates and independent correlates of recurrent pneumonia. RESULTS The final cohort included 2709 inpatients; 43% were 75 years or older, 34% were not fully independent, and 56% had severe pneumonia. Over 5 years of follow-up, 245 (9%; 95% confidence interval [CI], 8%-10%) patients developed recurrent pneumonia, and 156 (64%) of these episodes required hospitalization. Rate of recurrence was 3.0/100 person-years and median time to recurrence was 317 days (interquartile range, 177-569); 32 (13%) patients had 2 or more recurrences. In multivariable analyses only age >75 years (adjusted P = .047) and less than fully independent functional status (12% recurrence rate with impaired functional status vs 7% for fully independent; adjusted hazard ratio, 1.7; 95% CI, 1.3-2.2; P < .001) were significantly associated with recurrent pneumonia. CONCLUSIONS One of 11 patients who survived CAP hospitalization had recurrent pneumonia over 5 years and those with impaired functional status were at particularly high risk. Recurrent pneumonia is common and more attention to preventive strategies at discharge and closer follow-up over the long-term seem warranted.
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Affiliation(s)
- T T Dang
- Department of Medicine, Faculty of Medicine and Dentistry
| | - D T Eurich
- School of Public Health, University of Alberta, Edmonton
| | - D L Weir
- School of Public Health, University of Alberta, Edmonton
| | - T J Marrie
- Department of Medicine, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
| | - S R Majumdar
- Department of Medicine, Faculty of Medicine and Dentistry School of Public Health, University of Alberta, Edmonton
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Ehlers P, Dang TT, Patonay T, Villinger A, Langer P. Synthesis of Alkynylated Selenophenes by Site-Selective Sonogashira Reactions of Tetrabromoselenophene. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201440] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Toguem SMT, Knepper I, Ehlers P, Dang TT, Patonay T, Langer P. Synthesis of Dibenzothiophenes and Carbazoles by Sequential ‘Tetra-Fold Heck/6 π-Electrocyclization/Dehydrogenation’ Reactions of Tetrabromothiophene and Tetrabromo-N-methylpyrrole. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200057] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Reunova GD, Kats IL, Muzarok TI, Nguen CTP, Dang TT, Zhuravlev IN. [Population genetic structure of wild-growing ginseng (Planax ginseng C. A. Meyer) assessed using AFLP markers]. Genetika 2012; 48:340-351. [PMID: 22679781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Genetic variability in ten populations of wild-growing ginseng was assessed using AFLP markers with the application of fragment analysis on a genetic analyzer. The variation indices were high in the populations (P = 55.68%; H(S) = 0.1891) and for the species (P = 99.65%; H(S) = 0.2857). Considerable and statistically significant population differentiation was demonstrated (theta = 0.363; Bayesian approach, "full model"; F(ST) = 0.36, AMOVA). The results of AMOVA and Bayesian analysis indicate that 64.46% of variability is found within the populations. Mantel test showed no correlation between the genetic and geographic distances among the populations (r = -0.174; P = 0.817). Hierarchical AMOVA and analysis of genetic relationships based on Euclidean distances (NJ, PCoA, and MST) identified two divergent population groups of ginseng. Low gene flow between these groups (N(m) = 0.4) suggests their demographic independence. In accordance to the concept of evolutionary significant units (ESU), these population groups, in terms of the strategy and tactics for conservation and management of natural resources, should be treated as management units (MUs). The MS tree topology suggests recolonization of southern Sikhote-Alin by ginseng along two directions, from south and west.
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Reunova GD, Kats IL, Muzarok TI, Nguyen CTP, Dang TT, Brenner EV, Zhuravlev YN. Diversity of microsatellite loci in the Panax vietnamensis Ha et Grushv. (Araliaceae) population. Dokl Biol Sci 2012; 441:408-11. [PMID: 22227693 DOI: 10.1134/s0012496611060184] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Indexed: 11/23/2022]
Affiliation(s)
- G D Reunova
- Institute of Biology and Soil Science, Russian Academy of Sciences, Vladivostok, 690022, Russia
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Taesch J, Dang TT, Heitz V. Efficient synthesis and Suzuki cross-coupling reactions of meso-tetrakis(2,6-dimethyl-4-triflyloxyphenyl)porphyrin. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2011.11.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Bisson R, Dang TT, Sacchi M, Beck RD. Vibrational activation in direct and precursor-mediated chemisorption of SiH4 on Si(100). J Chem Phys 2008; 129:081103. [DOI: 10.1063/1.2976563] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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Karapetyan V, Mkrtchyan S, Dang TT, Villinger A, Reinke H, Langer P. Regioselective synthesis of 6-halomethyl-5,6-dihydro-4H-1,2-oxazines based on cyclizations of arylalkenyl-oximes. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.05.116] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Dang TT, Dang TT, Fischer C, Görls H, Langer P. Synthesis of pyrazole-3-carboxylates and pyrazole-1,5-dicarboxylates by one-pot cyclization of hydrazone dianions with diethyl oxalate. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.12.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Bisson R, Dang TT, Sacchi M, Beck RD. Cavity ring-down spectroscopy of jet-cooled silane isotopologues in the Si-H stretch overtone region. J Chem Phys 2007; 127:244301. [PMID: 18163669 DOI: 10.1063/1.2819072] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Absorption spectra of silane in the region of the first overtone of the Si-H stretch vibration have been recorded in a seeded supersonic jet expansion by cavity ring-down spectroscopy as well as in a static gas cell at room temperature by photoacoustic spectroscopy. Spectral simplification due to strong rotational cooling in the jet expansion enables us to clearly resolve and assign the rovibrational transitions of the (2000) and (1100) bands of the three isotopologues, (28)SiH(4), (29)SiH(4), and (30)SiH(4), in their natural isotopic abundance. Interconversion between different nuclear spin species of SiH(4) is found to be absent during the jet expansion. Isotope shifts for (29)SiH(4) and (30)SiH(4) relative to (28)SiH(4) are measured and found to be suitable for selective vibrational excitation of any of three silane isotopologues by pulsed laser excitation in a jet expansion.
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Affiliation(s)
- R Bisson
- Laboratoire de Chimie Physique Moléculaire, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
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22
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Abstract
The dissociation of methane on a nickel catalyst is a key step in steam reforming of natural gas for hydrogen production. Despite substantial effort in both experiment and theory, there is still no atomic-scale description of this important gas-surface reaction. We report quantum state-resolved studies, using pulsed laser and molecular beam techniques, of vibrationally excited methane reacting on the nickel (100) surface. For doubly deuterated methane (CD2H2), we observed that the reaction probability with two quanta of excitation in one C-H bond was greater (by as much as a factor of 5) than with one quantum in each of two C-H bonds. These results clearly exclude the possibility of statistical models correctly describing the mechanism of this process and attest to the importance of full-dimensional calculations of the reaction dynamics.
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Affiliation(s)
- Rainer D Beck
- Laboratoire Chimie Physique Moléculaire, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
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23
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Abstract
Signal transduction through the CD40 receptor is initiated by binding of its trimeric ligand and propagated by interactions of tumor necrosis factor receptor-associated factor (TRAF) proteins with the multimerized CD40 cytoplasmic domain. Using defined multimeric constructs of the CD40 cytoplasmic domain expressed as either soluble or myristoylated proteins, we have addressed the extent of receptor multimerization needed to initiate signal transduction and identified components of CD40 signaling complexes. Signal transduction in human embryonic kidney 293 cells, measured by nuclear factor kappaB activation, was observed in cells expressing soluble trimeric CD40 cytoplasmic domain and to a lesser extent in cells expressing dimeric CD40 cytoplasmic domain. Nuclear factor kappaB activation was strongest in cells expressing myristoylated trimeric CD40 cytoplasmic domain. Signal transduction through trimeric CD40 cytoplasmic domains with various point mutations in the TRAF binding sites was similar to signal transduction through analogous full-length receptors. Transiently expressed soluble trimeric CD40 cytoplasmic domain was isolated as complexes that contained TRAF2, TRAF3, TRAF5, TRAF6, and the inhibitor of apoptosis protein (c-IAP1). Association of c-IAP1 with the CD40 cytoplasmic domain complex was indirect and dependent on the presence of an intact TRAF1/2/3 binding site. These results suggest that extracellular ligation of CD40 can be bypassed and that soluble trimerized CD40 complexes can be isolated and used to identify components that link CD40 with signaling pathways.
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Affiliation(s)
- B G Werneburg
- Department of Biology, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, USA
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24
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Pullen SS, Dang TT, Crute JJ, Kehry MR. CD40 signaling through tumor necrosis factor receptor-associated factors (TRAFs). Binding site specificity and activation of downstream pathways by distinct TRAFs. J Biol Chem 1999; 274:14246-54. [PMID: 10318845 DOI: 10.1074/jbc.274.20.14246] [Citation(s) in RCA: 139] [Impact Index Per Article: 5.6] [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: 11/06/2022] Open
Abstract
Tumor necrosis factor receptor-associated factors (TRAFs) associate with the CD40 cytoplasmic domain and initiate signaling after CD40 receptor multimerization by its ligand. We used saturating peptide-based mutational analyses of the TRAF1/TRAF2/TRAF3 and TRAF6 binding sequences in CD40 to finely map residues involved in CD40-TRAF interactions. The core binding site for TRAF1, TRAF2, and TRAF3 in CD40 could be minimally substituted. The TRAF6 binding site demonstrated more amino acid sequence flexibility and could be optimized. Point mutations that eliminated or enhanced binding of TRAFs to one or both sites were made in CD40 and tested in quantitative CD40-TRAF binding assays. Sequences flanking the core TRAF binding sites were found to modulate TRAF binding, and the two TRAF binding sites were not independent. Cloned stable transfectants of human embryonic kidney 293 cells that expressed wild type CD40 or individual CD40 mutations were used to demonstrate that both TRAF binding sites were required for optimal NF-kappaB and c-Jun N-terminal kinase activation. In contrast, p38 mitogen-activated protein kinase activation was primarily dependent upon TRAF6 binding. These studies suggest a role in CD40 signaling for competitive TRAF binding and imply that CD40 responses reflect an integration of signals from individual TRAFs.
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Affiliation(s)
- S S Pullen
- Department of Biology, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877-0368, USA
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25
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Pullen SS, Miller HG, Everdeen DS, Dang TT, Crute JJ, Kehry MR. CD40-tumor necrosis factor receptor-associated factor (TRAF) interactions: regulation of CD40 signaling through multiple TRAF binding sites and TRAF hetero-oligomerization. Biochemistry 1998; 37:11836-45. [PMID: 9718306 DOI: 10.1021/bi981067q] [Citation(s) in RCA: 193] [Impact Index Per Article: 7.4] [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: 02/08/2023]
Abstract
CD40 is a TNF receptor superfamily member that provides activation signals in antigen-presenting cells such as B cells, macrophages, and dendritic cells. Multimerization of CD40 by its ligand initiates signaling by recruiting TNF receptor-associated factors (TRAFs) to the CD40 cytoplasmic domain. Recombinant human TRAF proteins overexpressed in insect cells were biochemically characterized and used to finely map TRAF binding regions in the human CD40 cytoplasmic domain. TRAF1, TRAF2, TRAF3, and TRAF6, but not TRAF4 or TRAF5, bound directly to the CD40 cytoplasmic domain. CD40 interactions with TRAF2 and TRAF3 were stronger than the interactions with TRAF1 and TRAF6. Full-length TRAF3 and TRAF5 formed hetero-oligomers, presumably through their predicted isoleucine zippers. TRAF3-TRAF5 hetero-oligomers interacted with CD40, indicating that TRAF5 can be indirectly recruited to the CD40 cytoplasmic domain. Overlapping peptides synthesized on cellulose membranes were used to map each TRAF interaction region. TRAF1, TRAF2, and TRAF3 interacted with the same region. The recognition site for TRAF6 was a nonoverlapping membrane proximal region. Using peptides with progressive deletions, a minimal TRAF1, TRAF2, and TRAF3 binding region was mapped to the PVQET sequence in the CD40 cytoplasmic domain. The minimal region for TRAF6 binding was the sequence QEPQEINF. These studies demonstrate that the CD40 cytoplasmic domain contains two nonoverlapping TRAF binding regions and suggest that TRAF1, TRAF2, and TRAF3 could bind competitively to one site. Relative affinities and competition of individual and hetero-oligomeric TRAF proteins for CD40 binding sites may contribute to receptor specificity and cell-type selectivity in CD40-dependent signaling.
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Affiliation(s)
- S S Pullen
- Department of Biology, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877-0368, USA
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26
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Qu Z, Picou M, Dang TT, Angell E, Planck SR, Hart CE, Rosenbaum JT. Immunolocalization of basic fibroblast growth factor and platelet-derived growth factor-A during adjuvant arthritis in the Lewis rat. Am J Pathol 1994; 145:1127-39. [PMID: 7977644 PMCID: PMC1887429] [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] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A prerequisite in defining the role of a growth factor in a disease is knowledge of its expression kinetics during the natural course of the disease. We, therefore, used immunohistochemical and immunoblot analyses to examine tissue distribution of basic fibroblast growth factor (bFGF) and platelet-derived growth factor (PDGF-A) during the development of destructive arthropathy in the rat adjuvant arthritis model. In normal joints, bFGF was primarily localized in endothelial cells. In inflamed joints, increased staining for bFGF was found in the invading panni, hyperplastic synovium, and thickened periosteum where bFGF was also co-localized with two cell proliferation markers. Staining for bFGF began to increase at the onset of arthritis (days 11 to 13), reached peak level on days 17 to 24, and gradually declined afterward. In contrast, PDGF-A staining did not change until day 17 and the increased staining was restricted to areas of newly formed bone. The district temporal and spatial distribution pattern of these two growth factors during the destructive arthropathy strongly suggests that they play different roles during arthritis. Although PDGF-A seems to be exclusively related to osteogenesis, bFGF may have a more extensive impact on synovial proliferation and bone destruction as well as bone formation.
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Affiliation(s)
- Z Qu
- Department of Cell Biology and Anatomy, Casey Eye Institute, Oregon Health Sciences University, Portland 97201
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27
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Abstract
Normal levels of cancer-associated antigen (CA) 19-9, neurone-specific enolase (NSE), cancer-associated antigen (CA) 125, and mucin-like carcinoma-associated antigen (MCA) during pregnancy were determined in 87 mothers and fetuses, using a solid-phase sandwich enzyme immunoassay. CA 19-9 concentrations were higher in the fetuses, whereas the other three tumour-associated antigen levels were higher in the mothers. Only fetal NSE and MCA levels were positively correlated with those in maternal serum. Contrary to adult samples, no difference was demonstrated between male and female fetal levels of CA 125. MCA was the only maternal marker that increased significantly with gestational age between 20 and 34 weeks' pregnancy.
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Affiliation(s)
- P Hohlfeld
- Laboratoire d'Hématologie, Université de Paris-Sud, Faculté de Chatenay Malabry, France
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28
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Dang TT, Pedersen SF, Leary JA. Chiral recognition in the gas phase: Mass spectrometric studies of diastereomeric cobalt complexes. J Am Soc Mass Spectrom 1994; 5:452-459. [PMID: 24222600 DOI: 10.1016/1044-0305(94)85061-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/1993] [Revised: 12/15/1993] [Accepted: 12/21/1993] [Indexed: 06/02/2023]
Abstract
Results of mass analyzed ion kinetic energy (MIKE) spectra and kinetic energy release (KER) measurements of diastereomeric octahedral cobalt complexes indicate that these diastereomers can be distinguished in the gas phase. Four alkyl tartrate esters were complexed to cobalt trisacetylacetonate (Co(acac)3) in the presence of a chiral auxiliary, RR- and SS-threohydrobenzoin. Different KER values of the product ion generated from [Co(acac)2/D- or L-diisopropyl tartrate](+) reflect differences in the precursor ion structure. The dissociation pathway resulting in this product ion is believed to arise via a hydride transfer from the acetylacetonate ligand to the metal center with subsequent loss of neutral organic species. It has been established that two conditions are necessary for observation of chiral recognition in this system; (1) the cobalt complex must be octahedral and (2) a chemical kinetic resolving agent must be present during formation of the complex.
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Affiliation(s)
- T T Dang
- Department of Chemistry, University of California, 94720, Berkelcy, CA, USA
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29
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Planck SR, Dang TT, Graves D, Tara D, Ansel JC, Rosenbaum JT. Retinal pigment epithelial cells secrete interleukin-6 in response to interleukin-1. Invest Ophthalmol Vis Sci 1992; 33:78-82. [PMID: 1370441] [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: 03/25/2023] Open
Abstract
Interleukin-6 (IL-6) is a peptide whose properties include the ability to activate T-lymphocytes, stimulate the secretion of immunoglobulin, induce neuronal differentiation, and trigger the release of acute phase proteins. We have detected IL-6-like activity in conditioned medium from cultured human retinal pigment epithelial (RPE) cells with a bioassay based on the ability of IL-6 to induce the proliferation of murine B-9 plasmacytoma cells. Biologic activity increased approximately 90-fold when the cells were cultured in the presence of IL-1 alpha (30 units/ml). Western blot analysis confirmed that conditioned medium from IL-1 alpha-stimulated RPE cells contained peptides with molecular weights ranging between 19,000 and 30,000 and reactive with antibody to IL-6. Finally, Northern blot analysis indicated that cells cultured in the presence of interleukin-1 contained a 1.2 kilobase transcript that hybridized to a cDNA probe specific for IL-6 messenger RNA. IL-6 peptide on Western blots and mRNA on Northern blots were undetectable unless cells were cultured in the presence of IL-1 alpha. Although IL-6 is synthesized by a variety of cell types, this report is the first to detect its synthesis by an eye-specific cell type. Furthermore, these observations indicate that retinal pigment epithelial cells respond to IL-1, a cytokine that previously has been implicated in ocular inflammation.
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Affiliation(s)
- S R Planck
- Department of Medicine, Oregon Health Sciences University, Portland 97201-3098
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30
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Abstract
A preparative purification of myristyl-Gly-Asn-Ile-Phe-Ala-Asn-Leu-Phe-Lys-Gly-Leu-Phe-Gly-Lys-Lys-Glu -NH2 was accomplished using the multi-coil counter-current chromatograph. A partition coefficient was determined in the n-butanol-acetic acid-water (4:1:5) system. Chromatographic runs were made in this system and one modified with ethyl acetate. The peptide material showed anomalous elution behavior due to its surfactant properties. It was found that by loading the sample exclusively in the stationary phase, satisfactory retention of the compound occurred. Finally, conditions utilizing the upper phase as the mobile phase successfully separated the impurities.
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Affiliation(s)
- M Knight
- Peptide Technologies Corporation, Washington, DC 20017-1004
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