1
|
San Martín B, Fresno M, Cornejo J, Godoy M, Ibarra R, Vidal R, Araneda M, Anadón A, Lapierre L. Optimization of florfenicol dose against Piscirickettsia salmonis in Salmo salar through PK/PD studies. PLoS One 2019; 14:e0215174. [PMID: 31083666 PMCID: PMC6513110 DOI: 10.1371/journal.pone.0215174] [Citation(s) in RCA: 12] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/27/2019] [Indexed: 11/18/2022] Open
Abstract
Salmonid Rickettsial Septicemia (SRS) is the disease of greatest economic importance in the Chilean salmon farming industry, causing high mortality in fish during the final stage of their productive cycle at sea. Since current, commercially available vaccines have not demonstrated the expected efficacy levels, antimicrobials, most commonly florfenicol, are still the main resource for the treatment and control of this pathogen. The aim of this study was to determine the most appropriate single dose of florfenicol, administered through medicated feed, for the treatment of Piscirickettsia salmonis (P. salmonis), using pharmacokinetic/pharmacodynamic (PK/PD) models. Previously, Minimum Inhibitory Concentrations (MICs) of florfenicol were determined for 87 P. salmonis isolates in order to define the epidemiological cut-off point (COWT). The most commonly observed MIC was 0.125 μg mL-1 (83.7%). The COWT value was 0.25 μg mL-1 with a standard deviation of 0.47 log2 μg mL-1 and 0.36 log2 μg mL-1, for Normalized resistance interpretation (NRI) method and ECOFFinder method, respectively. A MIC of 1 μg mL-1 was considered the pharmacodynamic value (PD) to define PK/PD indices. Three doses of florfenicol were evaluated in fish farmed under controlled conditions. For each dose, 150 fish were used and blood plasma samples were collected at different time points (0–48 hours). PK parameters were obtained from curves representing plasma concentrations as a function of time. The results of Monte Carlo simulation indicate that at a dose of 20 mg/Kg l.w. of florfenicol, administered orally as medicated feed, there is 100% probability (PTA) of achieving the desired efficacy (AUC0-24h/MIC>125). According to these results, we suggest that at the indicated dose, the PK/PD cut-off point for florfenicol versus P. salmonis could be 2 μg mL-1 (PTA = 99%). In order to assess the indicated dose in Atlantic salmon, fish were inoculated with P. salmonis LF-89 strain and then treated with the optimized dose of florfenicol, 20 mg/Kg bw for 15 days.
Collapse
Affiliation(s)
- Betty San Martín
- Laboratorio de Farmacología Veterinaria, Departamento de Ciencias Clínicas, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago, Chile
| | - Marcela Fresno
- Laboratorio de Farmacología Veterinaria, Departamento de Ciencias Clínicas, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago, Chile
| | - Javiera Cornejo
- Laboratorio de Inocuidad Alimentaria, Departamento de Medicina Preventiva, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago, Chile
| | - Marcos Godoy
- Centro de Investigaciones Biológicas Aplicadas (CIBA), Puerto Montt, Chile
- Facultad de Medicina Veterinaria, Universidad San Sebastian, Puerto Montt, Chile
| | | | - Roberto Vidal
- Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | | | - Arturo Anadón
- Departamento de Farmacología y Toxicología, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Lisette Lapierre
- Laboratorio de Inocuidad Alimentaria, Departamento de Medicina Preventiva, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago, Chile
- * E-mail:
| |
Collapse
|
2
|
Ibarra R, Rich KM, Adasme M, Kamp A, Singer RS, Atlagich M, Estrada C, Jacob R, Zimin-Veselkoff N, Escobar-Dodero J, Mardones FO. Animal production, animal health and food safety: Gaps and challenges in the chilean industry. Food Microbiol 2018; 75:114-118. [PMID: 30056955 DOI: 10.1016/j.fm.2017.10.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 03/12/2017] [Revised: 10/04/2017] [Accepted: 10/06/2017] [Indexed: 10/18/2022]
Abstract
This paper summarizes the gaps and challenges related to animal production, health, and food safety as discussed by a panel at the 1st International Symposium of Food Safety (ISFS) in Santiago, Chile, in December 2016. Participating representatives of academia, industry, and government and statements from the audience confirmed that food safety is essential for increasing food security. First, panelists identified the need for a science-based regulatory framework to implement effective regulations. Second, they highlighted the importance of a risk analysis framework to quantify the risk of the potential for antimicrobial resistance associated with the use of antimicrobials, and the need of studies to evaluate foodborne prevention/control strategies. Third, the challenges of filling the gaps between industry and academia were addressed, including examples of successful collaboration, opportunities, and weakness identified by industry. Finally, challenges in animal food production included issues related to changing consumer preferences, animal welfare, the use of antimicrobials, and sustainable animal production. The symposium provided a regional platform to share experiences from the implementation of methods and approaches for food safety. The roundtable successfully explored the future science and technology challenges that are of strategic importance for Chile and the region in animal health and food safety.
Collapse
Affiliation(s)
- R Ibarra
- Instituto Tecnológico del Salmón (INTESAL de SalmonChile), Av. Juan Soler Manfredini 41, Of. 1802, Puerto Montt, Chile
| | - K M Rich
- International Livestock Research Institute, East and Southeast Asia Regional Office, Hanoi, Viet Nam
| | - M Adasme
- Asociación Gremial de Productores de Cerdos de Chile (ASPROCER), Av. Isidora Goyenechea 2939, Of. 101, Las Condes, Santiago, Chile
| | - A Kamp
- SOPRAVAL, Panamericana Norte 500, La Calera, Valparaíso, Chile
| | - R S Singer
- Department of Veterinary and Biomedical Sciences, University of Minnesota, 1971 Commonwealth Ave., St. Paul, MN 55108, USA; Instituto de Medicina Preventiva Veterinaria, Facultad de Ciencias, Veterinarias, Universidad Austral de Chile, Valdivia, Chile
| | - M Atlagich
- AGROSUPER, Camino La Estrella 401, Of. 7, Sector Punta de Cortés, Rancagua, Chile
| | - C Estrada
- United States Department of Agriculture, Animal and Plant Health Inspection Service, International Affairs (USDA-APHIS-IS), US Embassy, SES Quadra 801, Brasilia 70403-900, Brazil
| | - R Jacob
- Agencia Chilena para la Inocuidad y Calidad Alimentaria (ACHIPIA), Calle Nueva York 17, 4to piso, Santiago, Chile
| | - N Zimin-Veselkoff
- Escuela de Medicina Veterinaria, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello (UNAB), Republica 440, Santiago, Chile
| | - J Escobar-Dodero
- Escuela de Medicina Veterinaria, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello (UNAB), Republica 440, Santiago, Chile
| | - F O Mardones
- Escuela de Medicina Veterinaria, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello (UNAB), Republica 440, Santiago, Chile.
| |
Collapse
|
3
|
Arriagada G, Sanchez J, Stryhn H, Vanderstichel R, Campistó JL, Ibarra R, St-Hilaire S. A multivariable assessment of the spatio-temporal distribution of pyrethroids performance on the sea lice Caligus rogercresseyi in Chile. Spat Spatiotemporal Epidemiol 2018; 26:1-13. [PMID: 30390925 DOI: 10.1016/j.sste.2018.04.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 01/12/2018] [Accepted: 04/27/2018] [Indexed: 10/17/2022]
Abstract
Synthetic pyrethroids have been widely used in Chile to control the sea lice Caligus rogercresseyi, a major ectoparasite of farmed salmon. Although resistance of C. rogercresseyi to pyrethroids has been reported in Chile, there is no information regarding the geographic extent of this problem. In this study we explored the spatial and temporal variation of C. rogercresseyi's response to pyrethroids in Chile from 2012 to 2013. We modeled lice abundance one week after treatment with a linear mixed-effects regression, and then we performed spatial and spatio-temporal cluster analyses on farm-level effects and on treatment-level residuals, respectively. Results indicate there were two areas where the post-treatment lice counts were significantly higher than in the rest of the study area. These spatial clusters remained even once we adjusted for environmental and management predictors, suggesting unmeasured factors (e.g. resistance) were causing the clustering. Further investigation should be carried out to confirm this hypothesis.
Collapse
Affiliation(s)
- Gabriel Arriagada
- Centre for Veterinary Epidemiological Research, Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada.
| | - Javier Sanchez
- Centre for Veterinary Epidemiological Research, Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada
| | - Henrik Stryhn
- Centre for Veterinary Epidemiological Research, Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada
| | - Raphaël Vanderstichel
- Centre for Veterinary Epidemiological Research, Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada
| | - José Luis Campistó
- Department of Fish Health, Instituto Tecnológico del Salmón, Av. Juan Soler Manfredini 41, Of. 1802, Puerto Montt, Chile
| | - Rolando Ibarra
- Department of Fish Health, Instituto Tecnológico del Salmón, Av. Juan Soler Manfredini 41, Of. 1802, Puerto Montt, Chile
| | - Sophie St-Hilaire
- Centre for Veterinary Epidemiological Research, Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada
| |
Collapse
|
4
|
Price D, Sánchez J, McClure J, McConkey S, Ibarra R, St-Hilaire S. Assessing concentration of antibiotics in tissue during oral treatments against piscirickettsiosis. Prev Vet Med 2018; 156:16-21. [PMID: 29891141 DOI: 10.1016/j.prevetmed.2018.04.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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: 05/18/2017] [Revised: 04/10/2018] [Accepted: 04/20/2018] [Indexed: 10/17/2022]
Abstract
The use of antimicrobials in aquaculture is increasingly being scrutinized. In Chile, piscirickettsiosis accounts for approximately 90% of the total volume of antibiotics used in marine aquaculture. Treatment failures are frequently reported, but there is limited information on why this occurs. Fish producers have started assessing the level of antibiotics in fish tissues during and immediately after in-feed treatments to determine if they are adequately medicating their fish. In this study, we evaluated the probability of finding antibiotic concentrations in muscle tissue above the minimum inhibitory concentration for 90% of the P. salmonis isolates (MIC90) recently tested in Chile, for two antibiotics commonly used in aquaculture. We found that the proportion of fish with antibiotic concentrations above the MIC90 varied, depending on the product used, species, day of sample collection, and size category of fish within a cage. The proportion of fish above the MIC90 was lower in fish treated with florfenicol than in fish treated with oxytetracycline. Using a mixed-effects logistic model, we modeled the probability of antibiotic concentrations above MIC90 when fish were treated with florfenicol. Our model suggested lower probabilities of having concentrations above MIC90 in Atlantic salmon than in rainbow trout when samples were collected 14 days after the treatment started compared to 7 days, and in the smaller fish within a cage. We discuss these findings and hypothesize about potential issues with treating large populations of fish with in-feed antimicrobials.
Collapse
Affiliation(s)
- D Price
- Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE, C1A 4P3, Canada
| | - J Sánchez
- Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE, C1A 4P3, Canada
| | - J McClure
- Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE, C1A 4P3, Canada
| | - S McConkey
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE, C1A 4P3, Canada
| | - R Ibarra
- Instituto Tecnológico del Salmón, Intesal-SalmonChile, Av. Juan Soler Manfredini 41, OF, 1802, Puerto Montt, Chile
| | - S St-Hilaire
- Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE, C1A 4P3, Canada; Department of Infectious Diseases and Public Health, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon, Hong Kong.
| |
Collapse
|
5
|
Escobar-Dodero J, Kinsley A, Perez AM, Ibarra R, Tello A, Monti G, Mardones FO. Risk factors for infectious pancreatic necrosis in farmed Chilean Atlantic salmon (Salmo salar L.) from 2010 to 2013. Prev Vet Med 2018; 167:182-189. [PMID: 29891102 DOI: 10.1016/j.prevetmed.2018.04.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 05/10/2017] [Revised: 04/20/2018] [Accepted: 04/24/2018] [Indexed: 10/17/2022]
Abstract
Infectious pancreatic necrosis (IPN) is a widespread and economically devastating fish disease caused by infection with a virus referred to as IPN virus (IPNv). In Chile, the disease is endemic and prevalent in both fresh- and salt-water farms affecting cultured salmonids, mainly Atlantic salmon. Here, we present the results of a retrospective cohort study of Atlantic salmon farms stocked between 2010 and 2013, aimed at quantifying the extent to which certain epidemiological factors influence the time interval between stocking and onset of IPN mortality (time to mortality, ttm) in marine farms. Six variables were retained in a final multivariable Cox proportional hazard model. Compared to the 2010 stocking year, ttm was shorter for salmon stocked in years 2012 (HR = 2.1; p = 0.005) and 2013 (HR = 4.3; p = 0.01). The number of salmon farms within a 10-km radius (HR = 1.07; p = 0.002), positive report of IPN in the previous production cycle (HR = 1.95; p = 0.006), three or more smolt batches (HR = 2.27; p < 0.001), and positive report of mortality attributable to BKD (HR = 2.02; p < 0.001) were also associated with low ttm; conversely, ttm was longer for farms that stocked heavier fish (HR = 0.94; p = 0.001). The results presented here were consistent with early studies of IPN epidemiology in Norway and Scotland. Some of the risk factors identified in this study also influenced the risk for other diseases, such as infectious salmon anemia, suggesting that implementation of selected management practices may help to mitigate the burden of important infectious diseases of salmon in Chile.
Collapse
Affiliation(s)
- J Escobar-Dodero
- Escuela de Medicina Veterinaria, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello (UNAB), Republica 440, Santiago 8370251, Chile
| | - A Kinsley
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota Saint Paul, MN, USA
| | - A M Perez
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota Saint Paul, MN, USA
| | - R Ibarra
- SalmonChile, Department of Fish Health, Instituto Tecnológico del Salmón, Av. Juan Soler Manfredini 41, OF 1802, Puerto Montt, Chile
| | - A Tello
- SalmonChile, Department of Fish Health, Instituto Tecnológico del Salmón, Av. Juan Soler Manfredini 41, OF 1802, Puerto Montt, Chile
| | - G Monti
- Instituto de Medicina Preventiva Veterinaria, Facultad de Ciencias Veterinarias, Universidad Austral de Chile, P.O. Box 567, Valdivia, Chile
| | - F O Mardones
- Escuela de Medicina Veterinaria, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello (UNAB), Republica 440, Santiago 8370251, Chile.
| |
Collapse
|
6
|
St-Hilaire S, Patanasatienkul T, Yu J, Kristoffersen AB, Stryhn H, Revie C, Ibarra R, Tello A, McEwan G. WITHDRAWN: Tool for predicting Caligus rogercresseyi abundance on salt ater salmon farms in Chile. Prev Vet Med 2018:S0167-5877(17)30106-X. [PMID: 29631865 DOI: 10.1016/j.prevetmed.2018.03.005] [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] [Received: 02/02/2017] [Revised: 11/15/2017] [Accepted: 03/07/2018] [Indexed: 11/29/2022]
Affiliation(s)
- S St-Hilaire
- Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, C1A 4P3, Canada.
| | - T Patanasatienkul
- Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, C1A 4P3, Canada
| | - J Yu
- Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, C1A 4P3, Canada
| | | | - H Stryhn
- Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, C1A 4P3, Canada
| | - C Revie
- Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, C1A 4P3, Canada
| | - R Ibarra
- Instituto Tecnológico del Salmón, Intesal-SalmonChile, Av Juan Soler Manfredini 41, OF 1802, Puerto, Montt, Chile
| | - A Tello
- Instituto Tecnológico del Salmón, Intesal-SalmonChile, Av Juan Soler Manfredini 41, OF 1802, Puerto, Montt, Chile
| | - G McEwan
- Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, C1A 4P3, Canada
| |
Collapse
|
7
|
Ibarra R, Amores N, Laso J. PS186 Conventional Mapping and Ablation of a Lower-Loop Reentrant Atrial Flutter. Glob Heart 2016. [DOI: 10.1016/j.gheart.2016.03.155] [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] Open
|
8
|
Price D, Stryhn H, Sánchez J, Ibarra R, Tello A, St-Hilaire S. Retrospective analysis of antibiotic treatments against piscirickettsiosis in farmed Atlantic salmon Salmo salar in Chile. Dis Aquat Organ 2016; 118:227-235. [PMID: 27025310 DOI: 10.3354/dao02978] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Piscirickettsiosis is the most prevalent salt-water infectious disease in farmed salmonids in Chile. Antimicrobials are used to treat this disease; however, there is growing concern about the poor response to therapeutants on some fish farms. The objective of this study was to assess whether factors such as type of antibiotic used, average fish weight, temperature at the beginning of the treatment, and mortality at the time of treatment administration affect the probability of treatment failure against piscirickettsiosis. Pen-level treatment and production information for the first treatment event from 2014 pens on 118 farms was used in a logistic mixed model to assess treatment failure. We defined a failed treatment as when the average mortality 3 wk after the treatment was above 0.1%. Farm and company were included in the model as random effects. We found that the antibiotic product, mortality level before the treatment, and fish weight at the start of the treatment all had a significant effect on treatment outcome. Our results suggest that antibiotic treatment success is higher if the treatment is administered when mortality associated with piscirickettsiosis is relatively low. We discuss the effect of weight on treatment success and its potential relationships with husbandry practices and drug pharmacokinetics.
Collapse
Affiliation(s)
- Derek Price
- Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, Canada C1A 4P3
| | | | | | | | | | | |
Collapse
|
9
|
Gustafson L, Remmenga M, Sandoval Del Valle O, Ibarra R, Antognoli M, Gallardo A, Rosenfeld C, Doddis J, Enriquez Sais R, Bell E, Lara Fica M. Area contact networks and the spatio-temporal spread of infectious salmon anemia virus (ISAV) in Chile. Prev Vet Med 2016; 125:135-46. [PMID: 26774449 DOI: 10.1016/j.prevetmed.2016.01.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [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: 11/06/2015] [Revised: 12/21/2015] [Accepted: 01/03/2016] [Indexed: 10/22/2022]
Abstract
Area management, the coordination of production and biosecurity practices across neighboring farms, is an important disease control strategy in aquaculture. Area management in aquaculture escalated in prominence in response to outbreaks of infectious salmon anemia (ISA) internationally. Successes in disease control have been attributed to the separation achieved through area-level synchronized stocking, fallowing, movement restrictions, and fomite or pest control. Area management, however, is costly; often demanding extra biosecurity, lengthy or inconveniently timed fallows, and localization of equipment, personnel, and services. Yet, this higher-order organizational structure has received limited epidemiologic attention. Chile's National Fisheries and Aquaculture Service instigated area management practices in response to the 2007 emergence of ISA virus (ISAV). Longitudinal data simultaneously collected allowed retrospective evaluation of the impact of component tenets on virus control. Spatiotemporal analyses identified hydrographic linkages, shared ports, and fish transfers from areas with recent occurrence of ISAV as the strongest predictors of virus spread between areas, though specifics varied by ISAV type (here categorized as HPR0 for the non-virulent genotypes, and HPRv otherwise). Hydrographic linkages were most predictive in the period before implementation of enhanced biosecurity and fallowing regulations, suggesting that viral load can impact spread dynamics. HPR0 arose late in the study period, so few HPRv events were available by which to explore the hypothesis of HPR0 as progenitor of outbreaks. However, spatiotemporal patterns in HPRv occurrence were predictive of subsequent patterns in HPR0 detection, suggesting a parallel, or dependent, means of spread. Better data precision, breadth and consistency, common challenges for retrospective studies, could improve model fit; and, for HPR0, specification of diagnostic test accuracy would improve interpretation.
Collapse
Affiliation(s)
- L Gustafson
- USDA APHIS VS Centers for Epidemiology and Animal Health, Surveillance Design and Analysis, 2150 Centre Ave, Fort Collins, CO 80526-8117, United States.
| | - M Remmenga
- USDA APHIS VS Centers for Epidemiology and Animal Health, Surveillance Design and Analysis, 2150 Centre Ave, Fort Collins, CO 80526-8117, United States
| | - O Sandoval Del Valle
- Sernapesca, Chile's National Fisheries and Aquaculture Service, Victoria 2832, Valparaiso, Chile
| | - R Ibarra
- SalmonChile, Department of Fish Health, Instituto Tecnologico del Salmon, Av. Juan Soler Manfredini 41, OF 1802 Puerto Montt, Chile
| | - M Antognoli
- USDA APHIS VS Centers for Epidemiology and Animal Health, Surveillance Design and Analysis, 2150 Centre Ave, Fort Collins, CO 80526-8117, United States
| | - A Gallardo
- Sernapesca, Chile's National Fisheries and Aquaculture Service, Victoria 2832, Valparaiso, Chile
| | - C Rosenfeld
- Instituto de Medicina Preventiva Veterinaria Facultad de Ciencias Veterinarias Universidad Austral de Chile Campus Isla Teja s/n, Valdivia, Chile
| | - J Doddis
- Instituto de Medicina Preventiva Veterinaria Facultad de Ciencias Veterinarias Universidad Austral de Chile Campus Isla Teja s/n, Valdivia, Chile
| | - R Enriquez Sais
- Lab de Biotecnologia y Patologia Acuatica Facultad de Ciencias Veterinarias Universidad Austral de Chile Campus Isla Teja s/n, Valdivia, Chile
| | - E Bell
- Colorado Department of Public Health and Environment, 4300 Cherry Creek Drive South, Denver, CO 80246, United States
| | - M Lara Fica
- Sernapesca, Chile's National Fisheries and Aquaculture Service, Victoria 2832, Valparaiso, Chile
| |
Collapse
|
10
|
Marín SL, Ibarra R, Medina MH, Jansen PA. Sensitivity of Caligus rogercresseyi (Boxshall and Bravo 2000) to pyrethroids and azamethiphos measured using bioassay tests-A large scale spatial study. Prev Vet Med 2015; 122:33-41. [PMID: 26455388 DOI: 10.1016/j.prevetmed.2015.09.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [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: 04/04/2015] [Revised: 09/27/2015] [Accepted: 09/29/2015] [Indexed: 11/24/2022]
Abstract
The variety of antiparasitics that can be used against caligid copepods is limited and efforts are needed to maintain their efficacies. The objective of this study was to monitor the sensitivity of Caligus rogercresseyi, populations towards antiparasitics based on deltamethrin, cypermethrin and azamethiphos within and across geographic regions. The bioassay design consisted of exposing parasites collected from 23 farms to the different chemotherapeutants at the concentration and exposure times recommended for field treatment, under laboratory conditions, and evaluating the number of dead and live parasites 48h after exposure. Parasites were collected from 23 farms distributed in four macrozones in the Los Lagos region and three macrozones in the Aysén region. Parasite sensitivity was evaluated using a Generalized Linear Mixed Model of the Binomial family (Logit) fit by the maximum likelihood, using the lme4 package in R. Parasite gender, macrozone, and antiparasitics were used as fixed factors and farm was the random factor. The model including all the factors proved to be a useful tool for predicting parasite sensitivity. This approach identified (i) those macrozones with a greater likelihood of finding parasite populations which are more or less sensitive to the three antiparasitics, (ii) cases in which parasite sensitivity to the different antiparasitics varied within a given macrozone, (iii) differences in sensitivity between females and males and (iv) an important random effect associated with farm. The results indicate a spatial variability of parasite sensitivity to antiparasitics which, added to the continuous treatments applied on farms, suggest it is necessary to regularly update the sensitivity status in the macrozones. This would allow managers to improve their decision making processes regarding the type of antiparasitic to be used in a given situation. The one-concentration type bioassay performed in this study allowed us to perform a large spatial study with replicated tests of the sensitivity of C. rogercresseyi to pyrethroids and azamethiphos. Further studies should focus on the farm effects, the relationship between the sensitivity of parasites and field efficacy, as well as parasite population structure and connectivity with regard to parasite transmission between farms.
Collapse
Affiliation(s)
- S L Marín
- Instituto de Acuicultura, Universidad Austral de Chile, P.O. Box 1327, Puerto Montt, Chile.
| | - R Ibarra
- Instituto Tecnológico del Salmón, INTESAL de SalmonChile, Puerto Montt, Chile
| | - M H Medina
- Instituto Tecnológico del Salmón, INTESAL de SalmonChile, Puerto Montt, Chile
| | | |
Collapse
|
11
|
Torres P, Quintanilla JC, Rozas M, Miranda P, Ibarra R, San Martín MF, Raddatz B, Wolter M, Villegas A, Canobra C, Hausdorf M, Silva R. Endohelminth parasites from salmonids in intensive culture from southern Chile. J Parasitol 2010; 96:669-70. [PMID: 20557217 DOI: 10.1645/ge-2211.1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A total of 228 salmonids (90 Oncorhynchus mykiss, 48 Oncorhynchus kisutch, and 90 Salmo salar) from 8 intensive aquaculture centers in the south of Chile were examined for endohelminths parasites between December 2008 and May 2009. The body cavities of 2 O. mykiss were infected by Diphyllobothrium sp. plerocercoids (prevalence: 6.7%, mean intensity: 1.0, mean abundance: 0.07) from the Lake Tarahuin hatchery on the south of Chiloé Island. Also, tetraphyllidean plerocercoids (prevalence: 3.3%, mean intensity: 1, mean abundance: 0.03) and fourth-stage larvae of Hysterothylacium aduncum (prevalence: 6.7%, mean intensity: 1, mean abundance 0.07) were observed in O. kisutch from a marine hatchery in Chiloé. The occurrences of Diphyllobothrium sp. in a lake and a tetraphyllidean plerocercoid from marine cultured salmonid in Chiloé are reported for first time. No muscular infection by helminths was recorded in the fish examined.
Collapse
Affiliation(s)
- P Torres
- Facultad de Medicina, Instituto de Parasitología, Universidad Austral de Chile, Casilla 567, Valdivia, Chile.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Carrique-Mas J, Iihoshi N, Widdowson MA, Roca Y, Morales G, Quiroga J, Cejas F, Caihuara M, Ibarra R, Edelsten M. An epidemiological study of Taenia solium cysticercosis in a rural population in the Bolivian Chaco. Acta Trop 2001; 80:229-35. [PMID: 11700180 DOI: 10.1016/s0001-706x(01)00161-9] [Citation(s) in RCA: 33] [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: 11/19/2022]
Abstract
A survey of 100 rural households in a village in the Chaco region of Bolivia revealed a serious problem of Taenia solium cysticercosis, with a seroprevalence of 99/447 (22%) in humans and 102/273 (37%) in pigs. Risk factors for humans were being in older age groups, absence of sanitary facilities, poor formal education and inability to recognise infected pork. Significant risk indicators were a history of seizures and the reported elimination of worms in the faeces. Risk factors for pigs were being in older age groups and absence of sanitary facilities in the owner's house. The proportion of households with evidence of human cysticercosis was similar for those who owned pigs (48%) and those that did not (55%). This unexpected finding was attributed to the high overall prevalence of cysticercosis in pigs and the probability that everyone, regardless of pig-ownership, had ample opportunity to become infected in such communities. The main recommendation for reducing the prevalence of human cysticercosis was to provide more effective education campaigns, aimed at preventing both T. solium infection and cysticercosis.
Collapse
Affiliation(s)
- J Carrique-Mas
- CTVM-LIDIVET Academic Link Programme, Centre for Tropical Veterinary Medicine, Edinburgh University, Easter Bush, Roslin EH259RG, Midlothian, UK.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Toney GM, Chavez HA, Ibarra R, Jinkins JR. Acute and subacute physiological and histological studies of the central nervous system after intrathecal gadolinium injection in the anesthetized rat. Invest Radiol 2001; 36:33-40. [PMID: 11176259 DOI: 10.1097/00004424-200101000-00005] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [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: 11/26/2022]
Abstract
RATIONALE AND OBJECTIVES To determine the acute physiological and subacute neurohistological effects of gadopentetate dimeglumine (GdD) administered intrathecally. METHODS Twenty-four rats were separated into two study groups. In the first group, the acute effects of intrathecal GdD on cortical electroencephalographic activity, renal sympathetic nerve activity, arterial blood pressure, and heart rate were determined. In the second group, histological evaluation of the neural tissues was performed 10 days after treatment. In both the physiological and histological studies, a single GdD dose of 2.5 micromol/g brain (10 microL) was administered intrathecally. Control animals were injected intrathecally with the same volume of a sucrose solution that had the same osmolality as GdD. RESULTS In the physiological study, GdD and sucrose injections elicited no significant change in any of the parameters recorded. In the histologic study, examination revealed two cases of pre-existing chronic spinal cord gliosis; one of these rats also exhibited signs of pre-existing chronic choroid plexus inflammation. No acute or subacute alterations observed could be specifically linked to the intrathecal administration of GdD. CONCLUSIONS Intrathecally administered GdD was accompanied by no significant change in any of the physiologic or histologic parameters examined. Based on the relatively short time interval between GdD treatment and histologic examination, the neural tissue abnormalities (gliosis/inflammation) observed in two animals were judged to be incidental and likely due to prior chronic pre-existing processes such as viral infection. Although additional studies are required to verify the safety and effectiveness of intrathecal GdD in humans, data from the present study in animals provide evidence that when intrathecal GdD is used in doses sufficient to improve MRI of the cerebrospinal fluid compartment, it is likely to be accompanied by a low incidence of acute changes in neural function or structure.
Collapse
Affiliation(s)
- G M Toney
- Department of Physiology, University of Texas Health Science Center, San Antonio, USA
| | | | | | | |
Collapse
|
14
|
Abstract
BACKGROUND Arachnoid cysts are intra-arachnoidal cerebrospinal fluid collections that are usually asymptomatic, however, they may become acutely symptomatic due to enlargement of the cyst or the presence of hemorrhage. MATERIALS AND METHODS We report a case of a child presenting with a 3-week history of headaches, nausea, and vision problems. There was no history of trauma. MRI clearly demonstrated a left middle cranial fossa arachnoid cyst with associated subacute intracystic and subdural hematoma that was causing mass effect and required surgery. RESULTS This lesion was isodense to the brain on CT. CONCLUSION We focus on the importance of MR imaging in the differentiation of these subacute/early chronic hemorrhagic collections that may be overlooked with CT.
Collapse
Affiliation(s)
- R Ibarra
- Department of Radiology, The University of Texas, Health Science Center, San Antonio 78284-7800, USA
| | | |
Collapse
|
15
|
Abstract
This pilot study details the feasibility of intrathecal gadopentetate dimeglumine (Gd) administration in the detection of posttraumatic cerebrospinal fluid (CSF) fistula in an animal model. Five rabbits were used in this study. An attempt was made to create a traumatic CSF fistula surgically via a nasal approach. Seven days following the procedure, images of the cranium in sagittal and coronal planes were obtained utilizing a 1.9 T magnetic resonance (MR) imaging scanner before and after intrathecal injection of 16 pmol Gd. Following the imaging study, the animals were euthanized and grossly sectioned coronally to search for fistula formation. One animal died on the third day following the surgical procedure. The other four rabbits underwent the MR and gross pathologic study. Diagnosis of the fistula by intrathecal Gd-enhanced MR imaging was successful in two rabbits; this finding was confirmed by gross pathologic examination. No fistula was detected on either intrathecal Gd-enhanced MR imaging or on pathologic study in the remaining two rabbits. Intrathecal enhanced MR cisternography is a potentially promising technique for the evaluation of posttraumatic CSF fistulae.
Collapse
Affiliation(s)
- R Ibarra
- Department of Radiology, The University of Texas Health Science Center, San Antonio 78284-7800, USA
| | | | | | | | | |
Collapse
|
16
|
Abstract
We report a case of otitis media associated with pneumonia due to Rhodococcus equi. A 31-year-old patient with AIDS presented with cough and right facial palsy. Imaging revealed right otitis media and severe temporal bone destruction, associated with pneumonia. R. equi was isolated from ear secretions, blood, and sputum. The radiologic findings are described. This unusual pathogen should be included in the differential diagnosis of the immunocompromised patient with aggressive otitis.
Collapse
Affiliation(s)
- R Ibarra
- The University of Texas Health Science Center, 7703 F. Curl Drive, San Antonio, TX 78284-7800, USA
| | | |
Collapse
|
17
|
Abstract
If behavior results from brain function, some evidence of dysfunction could be expected in children with major behavioral problems. Yet, neurophysiologic studies in these children are frequently normal. We hypothesized a relationship between maturational asymmetry and behavior, given the role of hemispheric imbalance in adult psychopathology. The purpose of this study was to investigate whether age-sensitive neurophysiologic measures could identify behaviorally relevant maturational asymmetries in otherwise healthy children. Ninety-five children were studied; reasons for testing were behavioral (19), academic (12), medical nonneurologic (16), and mixed (28), along with 20 control subjects. Academic, behavioral (Child Behavioral Checklist), and psychometric (Wechsler Intelligence Scale for Children-Revised; WISC-R) measures were analyzed in relation to four neurophysiologic parameters: P300 Latency, P300 Latency Asymmetry, Maturational Z-score, and Maturational Z-score Asymmetry, within a canonical design. The highest correlation was behavior with Maturational Z-score Asymmetry. Academic scores were predicted by the three-variable interaction of P300 Latency,Maturational Z-score, and Maturational Z-score Asymmetry. We concluded that behavior was strongly influenced by maturational asymmetry, while academic performance depended on both global maturation and maturational asymmetry. Our results suggest that behavioral disturbances can have a neural substrate despite apparently normal electroencephalograms (EEGs) and event-related potentials (ERPs). They open the possibility for specific therapeutic interventions to improve behavior and performance, and, perhaps, prevent major psychopathology in later life.
Collapse
Affiliation(s)
- M Gerez
- Department of Neurophysiology, Hospital Español de México, Mexico City
| | | | | | | | | |
Collapse
|
18
|
|
19
|
Cusumano A, Caldentey D, Marise C, Raimondo M, Ibarra R. Renal cortical necrosis as complication of leprosy treatment. Clin Nephrol 1992; 38:172-3. [PMID: 1395174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
|
20
|
Arancibia A, Chávez J, Ibarra R, Ruiz I, Icarte A, Thambo S, Chávez H. Disposition kinetics of dibekacin in normal subjects and in patients with renal failure. Int J Clin Pharmacol Ther Toxicol 1987; 25:38-43. [PMID: 3557728] [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: 01/06/2023]
Abstract
Dibekacin pharmacokinetics was studied in ten healthy volunteers and six patients with renal failure presenting Clcr less than 10 ml X min-1 per 1.73 m2 of body surface, given as a slow intravenous bolus to the volunteers and as a 30-minute intravenous infusion to the patients. The antibiotic was assayed in plasma and urine by means of a microbiological method using Bacillus subtilis. A two-compartment kinetic model was used to describe the bi-phasic decline of the plasma concentration thus establishing the different pharmacokinetic parameters. Elimination parameters beta, k10 and total body clearance were markedly diminished in renal patients (p less than 0.001): t1/2 beta was 2.0 h, k10 = 0.016 min-1 and Cl = 0.87 ml X min-1 kg body weight in normal subjects and t1/2 beta = 21.4 h, k10 = 0.0011 min-1 and Cl = 0.131 ml X min-1 per kg in the patients. Other kinetic parameters, as distribution (alpha) and transfer (k12, k21) constants were lower in patients than in volunteers. Also the different terms of volume of distribution of the two-compartment model (V1, Vdss, Vdarea) were significantly higher in patients than in normal subjects (p less than 0.05). A good correlation (r = 0.987) between patients' beta constant and creatinine clearance was found. A similar relationship between serum creatinine levels and disposition half-life was found (r = 0.955). Urinary recovery at 24 h was 89.0% of the dose given to normals and 15.8% of the dose given to patients.
Collapse
|
21
|
Abstract
All night sleep electroencephalograms were recorded in 10 healthy adults for 2 nights. On the second night all subjects were requested to be at the laboratory 5 hr. before their usual bedtime and were submitted to the same routine for performance on several visuomotor tasks; experimental subjects were required to use visual inverting prisms upon their arrival and during the performance of the tasks. Subjects were awakened 10 min. after each paradoxical sleep episode for dream collection. Dream content was significantly affected by the use of the inverting prisms: the presleep tasks and day-time activities were more frequently incorporated into the dreams of the experimental subjects. The dreams of the experimental group were more active and vividness was evaluated as lower by them than by the control subjects.
Collapse
|
22
|
Ibarra R, Perreira ND. Determination of Linkage Parameter and Pair Variable Errors in Open Chain Kinematic Linkages Using a Minimal Set of Pose Measurement Data. ACTA ACUST UNITED AC 1986. [DOI: 10.1115/1.3260797] [Citation(s) in RCA: 16] [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: 11/08/2022]
Abstract
During the manufacture of robotic systems differences between actual and nominal link lengths and orientations occur. In addition, errors between nominal and actual pair variables result from sensor and controller errors. Thus, when a robotic system attempts to perform a desired task using nominal motion planning schemes and nominal linkage kinematics, it will perform an actual task that is usually quite different from that desired. A procedure for determining the differences between the nominal and actual linkages parameters, pair variables, and tasks is presented. The approach can be used on all modern-day robots, as it incorporates solution techniques for the nonsquare and singular matrices that typically occur. An example using a PUMA 560 is included.
Collapse
Affiliation(s)
- R. Ibarra
- Department of Mechanical Engineering, University of Texas at Austin, Austin, TX
| | - N. D. Perreira
- Department of Mechanical Engineering and Mechanics and the Manufacturing Systems Engineering Program, Lehigh University, Bethlehem, PA 18015
| |
Collapse
|
23
|
Cedrato A, Ferrero N, Mieres A, Ibarra R, Puiggari J, Ferrero F, Ossorio F. [Primary tuberculosis]. Bol Med Hosp Infant Mex 1982; 39:341-4. [PMID: 7104077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
|
24
|
Ibarra R, Piñero DJ, Barsanti AC. [Immunoblastic lymphadenopathy]. Medicina (B Aires) 1977; 37:153-9. [PMID: 302384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
|
25
|
Feldstein CA, Ibarra R, Bellido CA, Iavicoli OR, González Del Solar CF, Burucua JE. [Hepatic changes in rheumatoid arthritis]. Rev Clin Esp 1974; 135:375-82. [PMID: 4457991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
26
|
Nadal MA, Bermudez J, Iotti R, Larguia AA, Duhart JE, Ibarra R, Lancestremere R, Gotlieb D. [The kidney in diabetes: study of various pathological and clinical aspects]. Medicina (B Aires) 1974; 34:500-6. [PMID: 4437388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
|
27
|
Ibarra R, Feldstein C, Duhart JE, Henry EC, Colombini P. [Anatomical and functional study of the liver in hyperthyroid patients]. Rev Clin Esp 1971; 121:187-92. [PMID: 5561952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
28
|
De Larrechea I, Ibarra R, Posse JC, Bondi JL. [Effect of prednisone on the intestinal mucosa in celiac disease]. Medicina (B Aires) 1970; 30:479-84. [PMID: 5510022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
|
29
|
Fustinoni O, Sciandro E, Fellner JP, Ibarra R. [Disseminated lupus erythematous]. Prensa Med Argent 1970; 57:829-38. [PMID: 5457712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
30
|
Cedrato AE, Taubenslag L, Ibarra R, Pagniez NF, Infantino I, Esandi E, Games R, Harisiadi J, De Cerato MT, Fried L, Levit S, Rybak A, Sorrentini A, Vautrin G. [Some aspects of the small intestine of calorico-protein dystrophic infants]. Minerva Pediatr 1970; 22:1297. [PMID: 5515318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
31
|
Ibarra R, Bondi JL, Posse JC, De Larrechea I. [Changes in the mucosa of the small intestine in intestinal lymphoma]. Medicina (B Aires) 1970; 30:234-40. [PMID: 5520760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
|
32
|
Ibarra R, Bondi JL, Posse JC, De Larrechea I. [Alterations in the small intestine mucosa in intestinal lymphoma]. Rev Esp Enferm Apar Dig 1970; 31:177-88. [PMID: 5525216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
33
|
Del Castillo LM, Dávila G, Dorantes L, Oliver C, Ibarra R, Castañeda-Agulló M. The influence of a free alpha-ammonium group in the substrate upon trypsin-catalyzed transesterification. Biochim Biophys Acta 1969; 191:354-61. [PMID: 5354266 DOI: 10.1016/0005-2744(69)90254-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
34
|
Duhart JE, Cerini CE, Obiglio H, Ibarra R, Gottlieb D. [Gastric biopsy by aspiration and the maximal histamine test in hyperthyroid patients]. Medicina (B Aires) 1969; 29:346-54. [PMID: 5406374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
|
35
|
Foglia VG, De Peralta Ramos MC, Ibarra R, Rivera Cortès L. [Alterations of fetuses and placentas during pregnancy in pancreatectomized white rats]. C R Seances Soc Biol Fil 1969; 162:2018. [PMID: 4241370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
36
|
Foglia VG, De Peralta Ramos MC, Ibarra R, Rivera Cortés L. [Fertility in pancreatectomized rats and anatomo-pathologic changes found in the uterus and ovary]. C R Seances Soc Biol Fil 1969; 162:2013. [PMID: 4241366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
37
|
Foglia VG, Ibarra R, Rivera Cortés L. [Fertility and ovarian uterine changes in the pancreatectomized rat]. Rev Soc Argent Biol 1967; 43:158-67. [PMID: 5610686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
38
|
Foglia VG, Cattáneo de Peralta RA, Ibarra R, Rivera Cortés L. [Fetal and placental characteristics of pregnancy in pancreatectomized rats]. Rev Soc Argent Biol 1967; 43:187-98. [PMID: 5629302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
39
|
Sáenz CA, Ibarra R, Irazu JC. [Partial nephrectomy because of polycystosis]. Rev Argent Urol Nefrol 1967; 36:248-9. [PMID: 5619910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
40
|
Ibarra R, Bondi JL, Posse JC, De Larrechea I. [Changes in the metabolism of absorbent cells in the primary malabsorption syndrome]. Prensa Med Argent 1967; 54:345-50. [PMID: 5614089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
41
|
Ibarra R, Posse JC, Bondi JL, De Larrechea I. [Relation between ATPase and lipid absorption in the normal and pathological intestine]. Medicina (B Aires) 1967; 27:75-8. [PMID: 4234493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
|
42
|
Marchese MJ, Bertorello MC, Ibarra R. [Gastric aspiration biopsy. Report of our first accident]. Prensa Med Argent 1966; 53:2003-4. [PMID: 5300553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
43
|
Sáenz CA, Ibarra R. [Morphological and histochemical changes of the ischemic kidney]. Rev Argent Urol Nefrol 1966; 35:178-85. [PMID: 6002635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
44
|
Gotlieb D, Ibarra R, Lancestremere RG, Galdo E, Monserrat A, Fustinoni O. [Acute renal insufficiency caused by acute malignant glomerulonephritis of the necrotizing type]. Prensa Med Argent 1966; 53:1767-9. [PMID: 5994105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
45
|
De Larrechea I, Sampayo RR, Sosa Miatello C, Ibarra R. [Intestinal disaccharidases enzyme activity. Its reduction in enteropathy caused by gluten and in other conditions of malabsorption]. Prensa Med Argent 1966; 53:1421-5. [PMID: 5999675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
46
|
Mosso HE, Pérgola F, Ibarra R. [Subacute pulmonary heart caused by metastasis from a mysosarcoma of a lower extremity]. Med Panam 1965; 23:139-41. [PMID: 5900049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
47
|
Perosio AM, Sadler T, Ibarra R, Monserrat AJ, Fustinoni O. [Sclerodermatomyositis]. Rev Asoc Med Argent 1965; 79:275-9. [PMID: 5844727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|