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Paton DJ, Reeve R, Capozzo AV, Ludi A. Estimating the protection afforded by foot-and-mouth disease vaccines in the laboratory. Vaccine 2019; 37:5515-5524. [PMID: 31405637 DOI: 10.1016/j.vaccine.2019.07.102] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 07/28/2019] [Accepted: 07/31/2019] [Indexed: 10/26/2022]
Abstract
Foot-and-mouth disease (FMD) vaccines must be carefully selected and their application closely monitored to optimise their effectiveness. This review covers serological techniques for FMD vaccine quality control, including potency testing, vaccine matching and post-vaccination monitoring. It also discusses alternative laboratory procedures, such as antigen quantification and nucleotide sequencing, and briefly compares the approaches for FMD with those for measuring protection against influenza virus, where humoral immunity is also important. Serology is widely used to predict the protection afforded by vaccines and has great practical utility but also limitations. Animals differ in their responses to vaccines and in the protective mechanisms that they develop. Antibodies have a variety of properties and tests differ in what they measure. Antibody-virus interactions may vary between virus serotypes and strains and protection may be affected by the vaccination regime and the nature and timing of field virus challenge. Finally, tests employing biological reagents are difficult to standardise, whilst cross-protection data needed for test calibration and validation are scarce. All of this is difficult to reconcile with the desire for simple and universal criteria and thresholds for evaluating vaccines and vaccination responses and means that oversimplification of test procedures and their interpretation can lead to poor predictions. A holistic approach is therefore recommended, considering multiple sources of field, experimental and laboratory data. New antibody avidity and isotype tests seem promising alternatives to evaluate cross-protective, post-vaccination serological responses, taking account of vaccine potency as well as match. After choosing appropriate serological tests or test combinations and cut-offs, results should be interpreted cautiously and in context. Since opportunities for experimental challenge studies of cross-protection are limited and the approaches incompletely reflect real life, more field studies are needed to quantify cross-protection and its correlation to in vitro measurements.
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Affiliation(s)
- D J Paton
- The Pirbright Institute, Ash Road, Pirbright, Surrey GU24 0NF, UK.
| | - R Reeve
- Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - A V Capozzo
- Instituto de Virología, CICVyA, INTA, N Repetto y De Los Reseros s/n, Hurlingham (1686), Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Tecnológicas, CONICET, Godoy Cruz 2290 (C1454FQB), Buenos Aires, Argentina
| | - A Ludi
- The Pirbright Institute, Ash Road, Pirbright, Surrey GU24 0NF, UK
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Ahmed Z, Pauszek SJ, Ludi A, LaRocco M, Khan EUH, Afzal M, Arshed MJ, Farooq U, Arzt J, Bertram M, Brito B, Naeem K, Abubakar M, Rodriguez LL. Genetic diversity and comparison of diagnostic tests for characterization of foot-and-mouth disease virus strains from Pakistan 2008-2012. Transbound Emerg Dis 2017; 65:534-546. [PMID: 29034593 DOI: 10.1111/tbed.12737] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Indexed: 02/06/2023]
Abstract
We report the laboratory analysis of 125 clinical samples from suspected cases of foot-and-mouth disease (FMD) in cattle and Asian buffalo collected in Pakistan between 2008 and 2012. Of these samples, 89 were found to contain viral RNA by rRT-PCR, of which 88 were also found to contain infectious FMD virus (FMDV) by virus isolation (VI), with strong correlation between these tests (κ = 0.96). Samples that were VI-positive were serotyped by antigen detection ELISA (Ag-ELISA) and VP1 sequence acquisition and analysis. Sequence data identified FMDV serotypes A (n = 13), O (n = 36) and Asia-1 (n = 41), including three samples from which both serotypes Asia-1 and O were detected. Serotype A viruses were classified within three different Iran-05 sublineages: HER-10, FAR-11 and ESF-10. All serotype Asia-1 were within Group VII (Sindh-08 lineage), in a genetic clade that differs from viruses isolated prior to 2010. All serotypes O were classified as PanAsia-2 within two different sublineages: ANT-10 and BAL-09. Using VP1 sequencing as the gold standard for serotype determination, the overall sensitivity of Ag-ELISA to correctly determine serotype was 74%, and serotype-specific sensitivity was 8% for serotype A, 88% for Asia-1 and 89% for O. Serotype-specific specificity was 100% for serotype A, 93% for Asia-1 and 94% for O. Interestingly, 12 of 13 serotype A viruses were not detected by Ag-ELISA. This study confirms earlier accounts of regional genetic diversity of FMDV in Pakistan and highlights the importance of continued validation of diagnostic tests for rapidly evolving pathogens such as FMDV.
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Affiliation(s)
- Z Ahmed
- USDA/ARS Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Greenport, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - S J Pauszek
- USDA/ARS Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Greenport, NY, USA
| | - A Ludi
- USDA/ARS Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Greenport, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - M LaRocco
- USDA/ARS Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Greenport, NY, USA
| | - E-U-H Khan
- Progressive Control of Foot and Mouth Disease in Pakistan, Food & Agriculture Organization of the United Nations Office, NARC Premises, Islamabad, Pakistan
| | - M Afzal
- Progressive Control of Foot and Mouth Disease in Pakistan, Food & Agriculture Organization of the United Nations Office, NARC Premises, Islamabad, Pakistan
| | - M J Arshed
- Progressive Control of Foot and Mouth Disease in Pakistan, Food & Agriculture Organization of the United Nations Office, NARC Premises, Islamabad, Pakistan
| | - U Farooq
- Animal Health Program, Animal Sciences Institute, National Agricultural Research Center, Islamabad, Pakistan
| | - J Arzt
- USDA/ARS Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Greenport, NY, USA
| | - M Bertram
- USDA/ARS Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Greenport, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - B Brito
- USDA/ARS Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Greenport, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - K Naeem
- Animal Health Program, Animal Sciences Institute, National Agricultural Research Center, Islamabad, Pakistan
| | - M Abubakar
- National Veterinary Laboratories, Islamabad, Pakistan
| | - L L Rodriguez
- USDA/ARS Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Greenport, NY, USA
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Ludi A, Ahmed Z, Pomeroy LW, Pauszek SJ, Smoliga GR, Moritz M, Dickmu S, Abdoulkadiri S, Arzt J, Garabed R, Rodriguez LL. Serotype Diversity of Foot-and-Mouth-Disease Virus in Livestock without History of Vaccination in the Far North Region of Cameroon. Transbound Emerg Dis 2016; 63:e27-38. [PMID: 24735162 PMCID: PMC4499489 DOI: 10.1111/tbed.12227] [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] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Indexed: 11/28/2022]
Abstract
Little information is available about the natural cycle of foot-and-mouth disease (FMD) in the absence of control measures such as vaccination. Cameroon presents a unique opportunity for epidemiological studies because FMD vaccination is not practiced. We carried out a prospective study including serological, antigenic and genetic aspects of FMD virus (FMDV) infections among different livestock production systems in the Far North of Cameroon to gain insight into the natural ecology of the virus. We found serological evidence of FMDV infection in over 75% of the animals sampled with no significant differences of prevalence observed among the sampled groups (i.e. market, sedentary, transboundary trade and mobile). We also found antibodies reactive to five of the seven FMDV serotypes (A, O, SAT1, SAT2 and SAT3) among the animals sampled. Finally, we were able to genetically characterize viruses obtained from clinical and subclinical FMD infections in Cameroon. Serotype O viruses grouped into two topotypes (West and East Africa). SAT2 viruses grouped with viruses from Central and Northern Africa, notably within the sublineage causing the large epidemic in Northern Africa in 2012, suggesting a common origin for these viruses. This research will guide future interventions for the control of FMD such as improved diagnostics, guidance for vaccine formulation and epidemiological understanding in support of the progressive control of FMD in Cameroon.
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Affiliation(s)
- A. Ludi
- Foreign Animal Disease Research Unit, United States Department of Agriculture, Agricultural Research Service, Plum Island Animal Disease Center, Greenport, NY, USA
- Oak Ridge Institute for Science and Education, Plum Island Animal Disease Center Research Participation Program, Oak Ridge, TN, USA
| | - Z. Ahmed
- Foreign Animal Disease Research Unit, United States Department of Agriculture, Agricultural Research Service, Plum Island Animal Disease Center, Greenport, NY, USA
- Oak Ridge Institute for Science and Education, Plum Island Animal Disease Center Research Participation Program, Oak Ridge, TN, USA
| | - L. W. Pomeroy
- Department of Veterinary Preventive Medicine, The Ohio State University, Columbus, OH, USA
| | - S. J. Pauszek
- Foreign Animal Disease Research Unit, United States Department of Agriculture, Agricultural Research Service, Plum Island Animal Disease Center, Greenport, NY, USA
| | - G. R. Smoliga
- Foreign Animal Disease Research Unit, United States Department of Agriculture, Agricultural Research Service, Plum Island Animal Disease Center, Greenport, NY, USA
| | - M. Moritz
- Department of Anthropology, The Ohio State University, Columbus, OH, USA
| | - S. Dickmu
- Laboratoire National Veterinaire, Lanavet, Garoua, Cameroon
| | | | - J. Arzt
- Foreign Animal Disease Research Unit, United States Department of Agriculture, Agricultural Research Service, Plum Island Animal Disease Center, Greenport, NY, USA
| | - R. Garabed
- Department of Veterinary Preventive Medicine, The Ohio State University, Columbus, OH, USA
- Public Health Preparedness for Infectious Disease Program, The Ohio State University, Columbus, OH, USA
| | - L. L. Rodriguez
- Foreign Animal Disease Research Unit, United States Department of Agriculture, Agricultural Research Service, Plum Island Animal Disease Center, Greenport, NY, USA
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de Carvalho Ferreira HC, Pauszek SJ, Ludi A, Huston CL, Pacheco JM, Le VT, Nguyen PT, Bui HH, Nguyen TD, Nguyen T, Nguyen TT, Ngo LT, Do DH, Rodriguez L, Arzt J. An Integrative Analysis of Foot-and-Mouth Disease Virus Carriers in Vietnam Achieved Through Targeted Surveillance and Molecular Epidemiology. Transbound Emerg Dis 2015; 64:547-563. [PMID: 26301461 DOI: 10.1111/tbed.12403] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Indexed: 11/28/2022]
Abstract
Foot-and-mouth disease (FMD) is a major constraint to transboundary trade in animal products, yet much of its natural ecology and epidemiology in endemic regions is still poorly understood. To address this gap, a multidisciplinary, molecular and conventional epidemiological approach was applied to an investigation of endemic FMD in Vietnam. Within the study space, it was found that 22.3% of sampled ruminants had previously been infected with FMD virus (FMDV), of which 10.8% were persistent, asymptomatic carriers (2.4% of the total population). Descriptive data collected from targeted surveillance and a farm questionnaire showed a significantly lower prevalence of FMDV infection for dairy farms. In contrast, farms of intermediate size and/or history of infection in 2010 were at increased risk of FMD exposure. At the individual animal level, buffalo had the highest exposure risk (over cattle), and there was spatial heterogeneity in exposure risk at the commune level. Conversely, carrier prevalence was higher for beef cattle, suggesting lower susceptibility of buffalo to persistent FMDV infection. To characterize virus strains currently circulating in Vietnam, partial FMDV genomic (VP1) sequences from carrier animals collected between 2012 and 2013 (N = 27) and from FMDV outbreaks between 2009 and 2013 (N = 79) were compared by phylogenetic analysis. Sequence analysis suggested that within the study period, there were two apparent novel introductions of serotype A viruses and that the dominant lineage of serotype O in Vietnam shifted from SEA/Mya-98 to ME-SA/PanAsia. FMDV strains shared close ancestors with FMDV from other South-East Asian countries indicating substantial transboundary movement of the predominant circulating strains. Close genetic relationships were observed between carrier and outbreak viruses, which may suggest that asymptomatic carriers of FMDV contribute to regional disease persistence. Multiple viral sequences obtained from carrier cattle over a 1-year period had considerable within-animal genetic variation, indicating within-host virus evolution.
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Affiliation(s)
- H C de Carvalho Ferreira
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Greenport, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - S J Pauszek
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Greenport, NY, USA
| | - A Ludi
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Greenport, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - C L Huston
- Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS, USA
| | - J M Pacheco
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Greenport, NY, USA
| | - V T Le
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - P T Nguyen
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - H H Bui
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - T D Nguyen
- National Centre for Veterinary Diagnostics, Hanoi, Vietnam
| | - T Nguyen
- National Centre for Veterinary Diagnostics, Hanoi, Vietnam
| | - T T Nguyen
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - L T Ngo
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - D H Do
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - L Rodriguez
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Greenport, NY, USA
| | - J Arzt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Greenport, NY, USA
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Abstract
The need for better foot-and-mouth disease (FMD) vaccines is not new, a report from the Research Commission on FMD, authored by F. Loeffler and P. Frosch in 1897, highlighted the need for developing a vaccine against FMD and qualified this as a devastating disease causing "severe economic damage to the country's agriculture" [1]. Inactivated antigen vaccines have been available since the early 1900s and have been instrumental in eradicating FMD from parts of the world and repressing clinical disease in others. However, these vaccines require using live virulent FMDV for manufacturing, fail to prevent infection resulting in the establishment of carrier animals, require multiple vaccination schedules (every six months) and have limited coverage to the specific serotype and in many cases subtype of FMDV. Therefore, FMD vaccinology continues to be a very active research field. Research-based novel vaccine approaches over the last decade have resulted in at least one novel molecular vaccine being licensed for emergency use in the US and multiple other vaccine approaches being actively pursued as alternatives to current vaccines. Here we will review and update the main research efforts on FMD vaccines, including subunit and peptide vaccines, DNA vaccines, empty capsid vaccines (directly delivered or vector delivered), novel inactivated antigen production platforms and live attenuated vaccines. Each of these approaches will be discussed in terms of their safety and efficacy characteristics, product transition feasibility as well as their applicability to global control and eradication efforts.
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Affiliation(s)
- A Ludi
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Orient Point, New York, NY, USA
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Ludi A, Feitknecht W. Lichtabsorption und Struktur von Kristallverbindungen der Übergangsmetalle. I. Lichtabsorption und Stuktur der Hydroxide, Halogenide und Hydroxidhalogenide von Kobalt und Nickel. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19630460641] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Gál S, Ludi A, Oswald HR, Signer R. Untersuchung der Bindung von Natrium- und Chlorid-Ionen durch Casein mittels RÖNTGEN-Strahlen- und Elektronen-Beugung. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19620450309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Herren F, Fischer P, Ludi A, Haelg W. Neutron diffraction study of Prussian Blue, Fe4[Fe(CN)6]3.xH2O. Location of water molecules and long-range magnetic order. Inorg Chem 2002. [DOI: 10.1021/ic50206a032] [Citation(s) in RCA: 460] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Stebler M, Ludi A, Buergi HB. Tetrakis(phenanthroline)di-.mu.-oxodimanganese(III,IV) tris(hexafluorophosphate).cntdot.acetonitrile and tetrakis(phenanthroline)di-.mu.-oxodimanganese(IV) tetraperchlorate.cntdot.acetonitrile: crystal structure analyses at 100 K, interpretation of disorder, and optical, magnetic, and electrochemical results. Inorg Chem 2002. [DOI: 10.1021/ic00246a032] [Citation(s) in RCA: 111] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Glauser R, Hauser U, Herren F, Ludi A, Roder P, Schmidt E, Siegenthaler H, Wenk F. Mixed valence spectrum and cyclic voltammetry of binuclear iron cyano complexes. J Am Chem Soc 2002. [DOI: 10.1021/ja00806a048] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rieder K, Hauser U, Siegenthaler H, Schmidt E, Ludi A. Synthesis and spectroelectrochemical properties of pentaammineruthenium(II) complexes of quinone diimines. Inorg Chem 2002. [DOI: 10.1021/ic50150a034] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [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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Nagasundaram N, Roper G, Biscoe J, Chai JW, Patterson HH, Blom N, Ludi A. Single-crystal luminescence study of the layered compound potassium dicyanoaurate. Inorg Chem 2002. [DOI: 10.1021/ic00237a006] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.9] [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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Lehmann H, Schenk KJ, Chapuis G, Ludi A. Synthesis and properties of .pi.-bonded olefin and acetylene complexes of ruthenium(II). Crystal and molecular structure of the pentaammineruthenium(II) fumaric acid complex, [(NH3)5Ru(C4H4O4)]S2O6.2H2O. J Am Chem Soc 2002. [DOI: 10.1021/ja00515a008] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Karlen T, Ludi A, Mühlebach A, Bernhard P, Pharisa C. Photoinduced ring opening metathesis polymerization (PROMP) of strained bicyclic olefins with ruthenium complexes of the type [(η6-arene1)Ru(η6-arene2)]2 and [Ru(Nc-R)6]2. ACTA ACUST UNITED AC 1995. [DOI: 10.1002/pola.1995.080331013] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mühlebach A, Bernhard P, Bühler N, Karlen T, Ludi A. Ring opening metathesis polymerization of bicyclo [2.2.1] hept-2-ene (2-norbornene) and exo,exo-5,6-bis (methoxycarbonyl)-7-oxabicyclo [2.2.1]hept-2-ene using Ru(II) and Ru(III) complexes: Polymerization kinetics and ruthenium content in polymers. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0304-5102(94)00005-0] [Citation(s) in RCA: 32] [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: 10/18/2022]
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Hunziker EB, Ludi A, Herrmann W. Preservation of cartilage matrix proteoglycans using cationic dyes chemically related to ruthenium hexaammine trichloride. J Histochem Cytochem 1992; 40:909-17. [PMID: 1376743 DOI: 10.1177/40.7.1376743] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.4] [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: 12/26/2022] Open
Abstract
We tested various cationic dyes chemically related to ruthenium hexaammine trichloride (RHT) [i.e., the RHT-cyclohexanedione complex (RHT-CC), pentaamine ruthenium N-dimethylphenylenediimine trichloride (PRT), tris-(bipyridyl)ruthenium (II) chloride (TRC), tris (bipyridyl) iron (II) chloride (TIC), and cobalt hexaammine trichloride (CHT)] for their effectiveness in precipitating cartilage matrix proteoglycans in situ. Dyes were introduced into media at the onset of processing and were present throughout both aldehyde fixation and osmium tetroxide post-fixation. Contrary to expectation, most of the dye-proteoglycan complexes generated and stable under aldehyde fixation conditions were found to be unstable during post-fixation despite the continuing presence of the dye. A similar phenomenon was also found for the cationic dyes commonly used for precipitation of proteoglycans in cartilage tissue sections (such as Acridine Orange, Alcian Blue, Azure A, Methylene Blue, and Ruthenium Red). Only two dyes, i.e., RHT and the newly tested RHT-CC, formed proteoglycan precipitates sufficiently stable to resist disruption and extraction during osmium tetroxide post-fixation. The latter may be particularly useful in semiquantitative analyses of proteoglycan content in unstained tissue sections owing to its intense brown-black color. For applications in which the osmium tetroxide post-fixation step may be omitted, TRC and PRT may also be valuable for semiquantitative histochemistry by virtue of their stable fluorescence and intense violet color signals, respectively.
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Affiliation(s)
- E B Hunziker
- M. E. Müller Institute for Biomechanics, University of Bern, Switzerland
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Luginbühl W, Ludi A, Raselli A, Bürgi HB. Structure of hexakis(acetonitrile)ruthenium(II) p-toluenesulfonate dihydrate at 100 K. Acta Crystallogr C 1989. [DOI: 10.1107/s0108270189004658] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Markert J, Blom N, Roper G, Perregaux A, Nagasundaram N, Corson M, Ludi A, Nagle J, Patterson H. Luminescence of cesium dicyanoaurate(I). Evidence for extended Au(I)Au(I) interactions in two dimensions. Chem Phys Lett 1985. [DOI: 10.1016/0009-2614(85)85311-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [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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Blom N, Ludi A, Bürgi HB. Dicesium sodium dicyanoaurate(I), Cs2Na[Au(CN)2]3. Crystal-chemical relationship to potassium dicyanoaurate(I) and -argentate(I). Acta Crystallogr C 1984. [DOI: 10.1107/s0108270184009483] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Lenz W, Schl�fer HL, Ludi A. Darstellung, optische, magnetische Eigenschaften und Struktur von Tetrakis-n-butylammonium-hexaisothio-cyanatotitanat (III). Z Anorg Allg Chem 1969. [DOI: 10.1002/zaac.19693650108] [Citation(s) in RCA: 5] [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: 11/08/2022]
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Ludi A, Oswald HR, Feitknecht W. Symposium über Koordinationsverbindungen. Struktur und Lichtabsorption des Hydroxyds der Halogenide und Hydroxydhalogenide des Kobalts. Angew Chem Int Ed Engl 1962. [DOI: 10.1002/ange.19620740814] [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: 11/05/2022]
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