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Revilla E, García-Beneytez E, López J, Cabello F. Anthocyanin pattern of several red grape cultivars and single-cultivar young wines. Acta Alimentaria 2013. [DOI: 10.1556/aalim.42.2013.1.3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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2
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Fernandez-Bussy S, Labarca G, Cabello F, Cabello H, Folch E, Majid A. Sweet's syndrome with pulmonary involvement: Case report and literature review. Respir Med Case Rep 2012; 6:16-9. [PMID: 26029596 PMCID: PMC3920571 DOI: 10.1016/j.rmcr.2012.08.004] [Citation(s) in RCA: 4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Accepted: 08/25/2012] [Indexed: 11/15/2022] Open
Abstract
A 74 year old female presented with fever, associated with papules and plaque in her upper and lower extremities. Exams revealed blood leukocytosis and a positive urine culture. Antibiotic therapy was initiated with no clinical response. After 1 week, chest X-ray showed right upper lobe alveolar infiltrate. A skin biopsy of the lesion showed infiltration by neutrophils, consistent with Sweet's Syndrome. Patient's condition progressively worsened, requiring oxygentherapy. Bronchoscopy and bronchoalveolar lavage were normal, transbronchial biopsies suggested lung involvement of Sweet 's syndrome. Antibiotic therapy was stopped. Corticosteroid were started. Therapy resulted in rapid clinical and radiological improvement.
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Affiliation(s)
- S Fernandez-Bussy
- Interventional Pulmonology, Clinica Alemana-Universidad del Desarrollo, Santiago, Manquehue Norte 1410, Chile
| | - G Labarca
- Clinica Alemana-Universidad del Desarrollo, Santiago, Chile
| | - F Cabello
- Universidad de Valparaiso, Santiago, Chile
| | - H Cabello
- Interventional Pulmonology, Clinica Alemana-Universidad del Desarrollo, Santiago, Manquehue Norte 1410, Chile
| | - E Folch
- Division of Thoracic Surgery and Interventional Pulmonology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - A Majid
- Division of Thoracic Surgery and Interventional Pulmonology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
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De Andrés MT, Benito A, Pérez-Rivera G, Ocete R, Lopez MA, Gaforio L, Muñoz G, Cabello F, Martínez Zapater JM, Arroyo-García R. Genetic diversity of wild grapevine populations in Spain and their genetic relationships with cultivated grapevines. Mol Ecol 2011; 21:800-16. [PMID: 22151598 DOI: 10.1111/j.1365-294x.2011.05395.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The wild grapevine, Vitis vinifera L. ssp. sylvestris (Gmelin) Hegi, considered as the ancestor of the cultivated grapevine, is native from Eurasia. In Spain, natural populations of V. vinifera ssp. sylvestris can still be found along river banks. In this work, we have performed a wide search of wild grapevine populations in Spain and characterized the amount and distribution of their genetic diversity using 25 nuclear SSR loci. We have also analysed the possible coexistence in the natural habitat of wild grapevines with naturalized grapevine cultivars and rootstocks. In this way, phenotypic and genetic analyses identified 19% of the collected samples as derived from cultivated genotypes, being either naturalized cultivars or hybrid genotypes derived from spontaneous crosses between wild and cultivated grapevines. The genetic diversity of wild grapevine populations was similar than that observed in the cultivated group. The molecular analysis showed that cultivated germplasm and wild germplasm are genetically divergent with low level of introgression. Using a model-based approach implemented in the software structure, we identified four genetic groups, with two of them fundamentally represented among cultivated genotypes and two among wild accessions. The analyses of genetic relationships between wild and cultivated grapevines could suggest a genetic contribution of wild accessions from Spain to current Western cultivars.
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Affiliation(s)
- M T De Andrés
- Departamento de Investigación Agroalimentaria, IMIDRA, Finca El Encín, Apto 127, 28800 Alcalá de Henares, Madrid, Spain
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Cabello F, Benito J, Saavedra Y, Nejar G, Fabre N, Anglade I, Vericat J, Martinez V, Cantó J, Vergara P. Sex-related acute toxicological effects of NS-B in rats. An activity of the Melius project. Toxicol Lett 2010. [DOI: 10.1016/j.toxlet.2010.03.887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Saavedra Y, Benito J, Cabello F, Nejar G, Martinez V, Vergara P, Cantó J. Toxic effects associated to the use of the delivery enhancer caprylocaproyl macrogol-8 glyceride (labrasol) in early toxicological studies in rats. An activity of the Melius project. Toxicol Lett 2010. [DOI: 10.1016/j.toxlet.2010.03.886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Benito J, Barbosa S, Cabello F, Vergara P, Fabre N, Nadal T, Vericat J, Montero OM, Moreno MPDLC, Cantó J, Martinez V. Characterization of exacerbated anticholinesterasic-related pharmacological effects in female rats treated with NP0361. An activity of the Melius project. Toxicol Lett 2010. [DOI: 10.1016/j.toxlet.2010.03.888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Arroyo-García R, Ruiz-García L, Bolling L, Ocete R, López MA, Arnold C, Ergul A, Söylemezoğlu G, Uzun HI, Cabello F, Ibáñez J, Aradhya MK, Atanassov A, Atanassov I, Balint S, Cenis JL, Costantini L, Goris-Lavets S, Grando MS, Klein BY, McGovern PE, Merdinoglu D, Pejic I, Pelsy F, Primikirios N, Risovannaya V, Roubelakis-Angelakis KA, Snoussi H, Sotiri P, Tamhankar S, This P, Troshin L, Malpica JM, Lefort F, Martinez-Zapater JM. Multiple origins of cultivated grapevine (Vitis vinifera L. ssp. sativa) based on chloroplast DNA polymorphisms. Mol Ecol 2006; 15:3707-14. [PMID: 17032268 DOI: 10.1111/j.1365-294x.2006.03049.x] [Citation(s) in RCA: 167] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The domestication of the Eurasian grape (Vitis vinifera ssp. sativa) from its wild ancestor (Vitis vinifera ssp. sylvestris) has long been claimed to have occurred in Transcaucasia where its greatest genetic diversity is found and where very early archaeological evidence, including grape pips and artefacts of a 'wine culture', have been excavated. Whether from Transcaucasia or the nearby Taurus or Zagros Mountains, it is hypothesized that this wine culture spread southwards and eventually westwards around the Mediterranean basin, together with the transplantation of cultivated grape cuttings. However, the existence of morphological differentiation between cultivars from eastern and western ends of the modern distribution of the Eurasian grape suggests the existence of different genetic contribution from local sylvestris populations or multilocal selection and domestication of sylvestris genotypes. To tackle this issue, we analysed chlorotype variation and distribution in 1201 samples of sylvestris and sativa genotypes from the whole area of the species' distribution and studied their genetic relationships. The results suggest the existence of at least two important origins for the cultivated germplasm, one in the Near East and another in the western Mediterranean region, the latter of which gave rise to many of the current Western European cultivars. Indeed, over 70% of the Iberian Peninsula cultivars display chlorotypes that are only compatible with their having derived from western sylvestris populations.
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Affiliation(s)
- R Arroyo-García
- Departamento de Genética Molecular de Plantas, Centro Nacional de Biotecnología, CSIC, C/Darwin 3, 28049 Madrid, Spain
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Gòdia F, Albiol J, Pérez J, Creus N, Cabello F, Montràs A, Masot A, Lasseur C. The MELISSA pilot plant facility as as integration test-bed for advanced life support systems. Adv Space Res 2004; 34:1483-93. [PMID: 15846877 DOI: 10.1016/j.asr.2003.08.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The different advances in the Micro Ecological Life Support System Alternative project (MELISSA), fostered and coordinated by the European Space Agency, as well as in other associated technologies, are integrated and demonstrated in the MELISSA Pilot Plant laboratory. During the first period of operation, the definition of the different compartments at an individual basis has been achieved, and the complete facility is being re-designed to face a new period of integration of all these compartments. The final objective is to demonstrate the potentiality of biological systems such as MELISSA as life support systems. The facility will also serve as a test bed to study the robustness and stability of the continuous operation of a complex biological system. This includes testing of the associated instrumentation and control for a safe operation, characterization of the chemical and microbial safety of the system, as well as tracking the genetic stability of the microbial strains used. The new period is envisaged as a contribution to the further development of more complete biological life support systems for long-term manned missions, that should be better defined from the knowledge to be gained from this integration phase. This contribution summarizes the current status of the Pilot Plant and the planned steps for the new period.
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Affiliation(s)
- F Gòdia
- MELISSA Pilot Plant Laboratory, Departemento d'Enginyeria Química, Escola Tecnica Superior d'Enginyeria, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain.
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Martín JP, Borrego J, Cabello F, Ortiz JM. Characterization of Spanish grapevine cultivar diversity using sequence-tagged microsatellite site markers. Genome 2003; 46:10-8. [PMID: 12669792 DOI: 10.1139/g02-098] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A broad germplasm bank collection containing most of the autochthonous Spanish grapevine cultivars was analyzed using six sequence-tagged microsatellite site (STMS) loci: VVS2, VVMD5, VVMD7, ssrVrZAG47, ssrVrZAG62, and ssrVrZAG79. The number of alleles obtained ranged from 9 in ssrVrZAG47 to 13 in VVS2, and the observed genotypes per locus varied between 24 (ssrVrZAG47) and 41 (VVSS2). A total of 57 unique genotypes were obtained considering all 6 loci, and 40 varieties presented at least 1 of these specific genotypes. The genotypic combinations for the 6 loci have generated 163 different profiles in the 176 cultivars. Ten pairs of accessions and one group of four Garnacha's cultivars can not be differentiated. The observed heterozygosity varied between 75.6 (VVMD7) and 90.9% (VVMD5), without significant differences from the expected values for any loci. The VVMD5 locus was the most informative, and also showed the highest discrimination power. The cumulative discrimination power for all six loci was practically 1; however, in fact, these STMS loci have differentiated only about 93% of the accessions, probably owing to high relatedness of the plant material. Usefulness of this STMS set for characterization of a Spanish grapevine collection is emphasized, as well as the elaboration of databases with these molecular markers.
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Affiliation(s)
- J P Martín
- Departamento de Biología Vegetal, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Ciudad Universitaria, 28040-Madrid, Spain.
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Gòdia F, Albiol J, Montesinos JL, Pérez J, Creus N, Cabello F, Mengual X, Montras A, Lasseur C. MELISSA: a loop of interconnected bioreactors to develop life support in space. J Biotechnol 2002; 99:319-30. [PMID: 12385718 DOI: 10.1016/s0168-1656(02)00222-5] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The development of a loop of interconnected continuous bioreactors, aimed to provide life support in space, is reported. The complete loop concept consists of four bioreactors and one higher plant compartment. For its realization the continuous and controlled operation of the bioreactors is characterized, up to the pilot scale level, first for each individual reactor, second for the interconnected reactor operation. The results obtained with the two more advanced bioreactors in the Micro Ecological Life Support System Alternative (MELISSA) loop are described more specifically. These reactors consist of a packed-bed reactor working with an immobilized co-culture of Nitrosomonas and Nitrobacter cells, and an external loop gas-lift photobioreactor for the culture of the cyanobacteria Spirulina platensis. Their individual operation for long duration runs has been achieved and characterized, and their interconnected operation at pilot scale is reported.
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Affiliation(s)
- F Gòdia
- Departament d'Enginyeria Química, Escola Tècnica Superior d'Enginyeria, Universitat Autònoma de Barcelona, Bellaterra 08193, Barcelona, Spain.
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Revilla E, García-Beneytez E, Cabello F, Marti-Ortega G, Ryan JM. Value of high-performance liquid chromatographic analysis of anthocyanins in the differentiation of red grape cultivars and red wines made from them. J Chromatogr A 2001; 915:53-60. [PMID: 11358262 DOI: 10.1016/s0021-9673(01)00635-5] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A HPLC method that allows the separation of several anthocyanins present in red grapes and red wines, using a linear gradient of acetonitrile in water at pH 1.3, using perchloric acid as an acid modifier, is described. Data clearly show that the anthocyanins profile of red grapes may be complex, but quite different for each cultivar studied. Thus, those molecules may be used as chemotaxonomic markers for classifying red grape cultivars. However, the anthocyanin profile of red wines clearly differs from that presented by grapes employed in making it, because red wine contains a higher relative amount of malvidin-3-O-glucoside than grapes, and the relative amount of other anthocyanins in wines is usually lower than in grapes. Therefore, the use of anthocyanins present in wines to determine the grape cultivar used for winemaking needs a careful evaluation of the influence of different technological procedures on the anthocyanins fingerprint.
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Affiliation(s)
- E Revilla
- Departamento de Química Agrícola, Geología y Geoquímica, Universidad Autónoma de Madrid, Spain.
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Fica A, Fernandez-Beros ME, Aron-Hott L, Rivas A, D'Ottone K, Chumpitaz J, Guevara JM, Rodriguez M, Cabello F. Antibiotic-resistant Salmonella typhi from two outbreaks: few ribotypes and IS200 types harbor Inc HI1 plasmids. Microb Drug Resist 2000; 3:339-43. [PMID: 9442485 DOI: 10.1089/mdr.1997.3.339] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
To investigate factors that could be involved in the emergence of antibiotic resistant S. typhi, we characterized R plasmids and antibiotic resistant S. typhi strains from two outbreaks of typhoid in Peru and Chile. Differences in the Inc HI1 plasmids of Peruvian and Chilean strains were identified by conjugation and incompatibility studies and plasmid DNA characterization. Antibiotic-resistant S. typhi harboring Inc HI1 plasmids belonged to a reduced number of Pst1 and Cla1 ribotypes and IS200 types, in contrast to the high genetic diversity found among epidemic antibiotic-susceptible S. typhi. The low diversity of antibiotic-resistant S. typhi suggests that they may express properties that are related to both their ability to harbor Inc HI1 R plasmids and to disseminate.
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Affiliation(s)
- A Fica
- Department of Microbiology and Immunology, New York Medical College, Valhalla 10595, USA
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Díaz-Morant V, Manteca R, Ortega M, Cabello F, Pérez-Santos MJ, Miramón J. [Empyema and spontaneous bacterial peritonitis in a cirrhotic patient by Streptococcus agalactiae]. Enferm Infecc Microbiol Clin 1999; 17:104. [PMID: 10193079] [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: 02/11/2023]
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Moreno-Arribas MV, Cabello F, Polo MC, Martín-Alvarez PJ, Pueyo E. Assessment of the native electrophoretic analysis of total grape must proteins for the characterization of Vitis vinifera L. cultivars. J Agric Food Chem 1999; 47:114-120. [PMID: 10563858 DOI: 10.1021/jf980483e] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The findings of an ampelographic analysis of vines belonging to a Germoplasm Bank were compared to the results of native electrophoresis of the total proteins in their musts. Cluster analysis of the data from the morphological description produced correct groupings, in terms of variety, for all samples. When cluster analysis was performed on the electrophoretic data, 10 of the 11 musts studied were grouped correctly. Electrophoresis was also performed on 30 musts made from a mixture of grapes from large vineyards. In the cluster analysis of the electrophoretic data on the proteins of the 41 musts studied, all the musts are grouped correctly in terms of variety. Electrophoretic analysis of proteins is a simple technique that can be used routinely, provides complementary information to morphological analysis for varietal characterization of vines, and in the majority of cases, makes it possible to ascertain the grape variety from which musts originate.
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Affiliation(s)
- M V Moreno-Arribas
- Instituto de Fermentaciones Industriales (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
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Ewald PW, Sussman JB, Distler MT, Libel C, Chammas WP, Dirita VJ, Salles CA, Vicente AC, Heitmann I, Cabello F. Evolutionary control of infectious disease: prospects for vectorborne and waterborne pathogens. Mem Inst Oswaldo Cruz 1998; 93:567-76. [PMID: 9830519 DOI: 10.1590/s0074-02761998000500002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Evolutionary theory may contribute to practical solutions for control of disease by identifying interventions that may cause pathogens to evolve to reduced virulence. Theory predicts, for example, that pathogens transmitted by water or arthropod vectors should evolve to relatively high levels of virulence because such pathogens can gain the evolutionary benefits of relatively high levels of host exploitation while paying little price from host illness. The entrance of Vibrio cholerae into South America in 1991 has generated a natural experiment that allows testing of this idea by determining whether geographic and temporal variations in toxigenicity correspond to variation in the potential for waterborne transmission. Preliminary studies show such correspondences: toxigenicity is negatively associated with access to uncontaminated water in Brazil; and in Chile, where the potential for waterborne transmission is particularly low, toxigenicity of strains declined between 1991 and 1998. In theory vector-proofing of houses should be similarly associated with benignity of vectorborne pathogens, such as the agents of dengue, malaria, and Chagas' disease. These preliminary studies draw attention to the need for definitive prospective experiments to determine whether interventions such as provisioning of uncontaminated water and vector-proofing of houses cause evolutionary reductions in virulence.
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Affiliation(s)
- P W Ewald
- Department of Biology, Amherst College, MA 01002-5000, USA
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Cabello F, Springer AD. [Typhoid fever in Chile 1977-1990: an emergent disease]. Rev Med Chil 1997; 125:474-82. [PMID: 9460291] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The emergence of old and new communicable diseases is becoming an important public health problem in industrialized and developing countries worldwide. Chile experienced, at the end of the seventies and during the eighties, epidemics of several emergent communicable infectious diseases whose relevance as public health problems had steadily decreased in the previous 25 years. The most striking of these epidemics was a severe outbreak of typhoid fever that lasted at least 10 years. The majority of the cases occurred in the urban setting of Santiago. Several investigators suggested, in light of apparently good sanitation statistics, that factors responsible for this outbreak of typhoid were an increase in the number of chronic carriers of Salmonella typhi, the lack of microbiological food controls and the consumption of vegetables irrigated with waste water contaminated with S typhi. However, there is a dearth of epidemiological information and field work confirming the role of these factors in this typhoid outbreak. Moreover, the sudden, massive and urban characteristics of this epidemic, coupled to contemporary information regarding shortcomings on the preparation of drinking water and on decreased availability of drinking water to the population in Santiago regardless of good sanitation statistics, suggest that this outbreak may have been partially waterborne. The beginning of this typhoid outbreak also coincided with increased rain fall, with rapidly deteriorating economic and social conditions manifested in high rates of unemployment, and with decreased government investment on social services, including sanitation and health. All these factors are known to influence the epidemiology of typhoid and other emergent diseases worldwide.
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Affiliation(s)
- F Cabello
- Departamento de Microbiología e Inmmunología, New York Medical College, EEUU.
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Cabello F, Springer AD. [Emergent diseases: old and new diseases. Etiological and climatic aspects. Socioeconomic and cultural influences]. Rev Med Chil 1997; 125:74-84. [PMID: 9336074] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
During recent years the world has experienced the reemergence of old communicable diseases and the emergence of new ones caused by novel pathogens such as the HIV virus and Borrelia burgdorferi. The problem consists mostly in the reemergence of old diseases but specially in industrialized countries new pathogens have also been described. Although the emergence of these infections in rare instances is due to genetic changes of pathogens to more virulent forms, most commonly they are due to changes in the environment and the host. Rapidly deteriorating living standards, disintegration of sanitation and public health infrastructure, cultural changes, migration and variations in behavior are some of the factors involved in the worldwide increase of infectious diseases. The degradation of natural habitats including forests and marine niches accompanied by climatic changes, are also playing an increasing role in the detrimental evolution of these diseases. The global emergence of these diseases calls into question the doctrine of epidemiological transition and directs us to scrutinize the paradigm that bases the prevention of these diseases solely on vaccination. The current situation also highlights the limitations of classical epidemiology in dealing with unexpected problems, and strongly suggests that this discipline should incorporate into its analysis findings from other fields, including ecological, climatological, and economical information. As most of the negative social and economical developments that impinge on the detrimental evolution of these diseases are increasing world-wide, it can be predicted that the problems posed by these infections will continue and perhaps worsen in the near future.
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Affiliation(s)
- F Cabello
- Departamento de Microbiología, New York Medical College, Valhalla 10595, USA
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Ortega F, Montemayor T, Sánchez A, Cabello F, Castillo J. Role of cardiopulmonary exercise testing and the criteria used to determine disability in patients with severe chronic obstructive pulmonary disease. Am J Respir Crit Care Med 1994; 150:747-51. [PMID: 8087347 DOI: 10.1164/ajrccm.150.3.8087347] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The aim of this study was to evaluate the precision and variability with which resting pulmonary function tests (resting PFTs) can be used to predict the capacity in exercise, and the usefulness of the different measurements of pulmonary function in the evaluation of impairment/disability in patients with chronic obstructive pulmonary disease (COPD). We studied 78 patients with stabilized COPD (FEV1 45.1 +/- 17.1%). Of these, 39 suffered severe impairment according to the resting PFTs. Both the group with severe impairment (maximal oxygen consumption [VO2,max]: 16.22 +/- 5 ml/kg/min; maximal minute ventilation [VEmax]: 31.87 +/- 7.1 L/min; maximal heart rate [HRmax]: 133.8 +/- 10.9 beats/min) and the group with nonsevere impairment according to the resting PFTs (VO2max: 22.55 +/- 7.9 ml/kg/min; VEmax: 42.11 +/- 10.9 L/min; HRmax: 138 +/- 13.7 beats/min) showed ventilatory limitation during exercise. FEV1 was the most prevalent criterion for the determination of severe impairment (FEV1 < 40%), and was the variable best correlated to VO2max (r = 0.52 with VO2max as absolute value and r = 0.54 with VO2max expressed as a percentage of the reference value), but the resting PFTs were not predictive of exercise performance including patients with severe COPD. Evaluation of working capacity (based on VO2max) revealed a significant number of inaccurate predictions among the results of the resting PFTs. Sensitivity and specificity analysis were used to compare the different criteria used to evaluate the severity of disability. They reveal that the classification will be different according to the criteria used.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- F Ortega
- Pneumology Service, University Hospital, Virgen del Rocío, Seville, Spain
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Aron L, Faundez G, Gonzalez C, Roessler E, Cabello F. Lipopolysaccharide-independent radioimmunoprecipitation and identification of structural and in vivo induced immunogenic surface proteins of Salmonella typhi in typhoid fever. Vaccine 1993; 11:10-7. [PMID: 8427032 DOI: 10.1016/0264-410x(93)90334-t] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [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: 01/30/2023]
Abstract
The humoral response to Salmonella typhi is important for protective immunity against typhoid fever, as indicated by the protection obtained with killed cell vaccines and component vaccines (outer membrane proteins, Vi antigen) in animals and human beings. Nonetheless, analysis and interpretation of host humoral immune response to S. typhi surface antigens have been difficult because of the complex structure of the S. typhi envelope and the lack of purified reagents for detection of immune response to individual surface components. Normal and convalescent human sera from typhoid fever patients were absorbed with S. typhi lipopolysaccharide. These sera were used in radioimmunoprecipitation assays of whole S. typhi cells and S. typhi membranes labelled with either 125I or 35S-methionine. This strategy has permitted the unequivocal identification of a humoral immune response to structural and in vivo induced outer membrane proteins of S. typhi. In this manner, we have identified the porins, lipoprotein, the iron-starvation-induced proteins, and three proteins of 30, 18.5 and 15 kDa as surface-exposed immunogens of S. typhi in patients with typhoid fever. These studies suggest that further experimental work is needed to characterize the relevance of both anti-S. typhi outer membrane protein and antilipopolysaccharide antibodies in recovery from S. typhi infections and protective immunity.
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Affiliation(s)
- L Aron
- Department of Microbiology and Immunology, New York Medical College, Valhalla 10595
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22
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Dworkin BM, Chodos JE, Fernandez ME, Van Horn K, Cabello F, Wormser GP. Use of plasmid profiles in the investigation of a patient with Helicobacter pylori infection and peptic ulcer disease. Am J Gastroenterol 1991; 86:354-6. [PMID: 1998317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Plasmids may effect bacterial virulence and antibiotic resistance, and serve as epidemiologic markers. In this study, plasmid DNA profiles of serial isolates of Helicobacter pylori showed persistence of an identical strain of this organism in a patient with duodenal ulcer disease. Three control strains of H. pylori isolated from other patients contained plasmids different from each other and from that of the original patient; two of these strains had two plasmids each. These data have important implications for further study of the epidemiology and pathogenesis of H. pylori-related diseases.
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Affiliation(s)
- B M Dworkin
- Sarah C. Upham Division of Gastroenterology, New York Medical College, Valhalla
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23
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Pavia CS, Kissel V, Bittker S, Cabello F, Levine S. Antiborrelial activity of serum from rats injected with the Lyme disease spirochete. J Infect Dis 1991; 163:656-9. [PMID: 1995740 DOI: 10.1093/infdis/163.3.656] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The functional properties of humoral factors generated in rats immunized against Borrelia burgdorferi were investigated. After Lewis strain rats were injected intraperitoneally with live B. burgdorferi or in the footpad with dead borreliae incorporated in complete Freund's adjuvant, they produced high-titered antisera. At a dilution of less than or equal to 1:10, sera from immunized or infected rats but not control sera inhibited growth of B. burgdorferi in vitro. Neutralization of growth of three different strains of B. burgdorferi by posttreatment sera was dose-dependent and was detected equally well by direct microscopic counts or by measuring incorporation of tritiated adenine into newly synthesized nucleic acids. These findings provide direct evidence that infection or immunization with the Lyme disease spirochete induces the formation of serum factors capable of preventing the growth of B. burgdorferi in vitro.
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Affiliation(s)
- C S Pavia
- Department of Medicine, New York Medical College, Valhalla
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24
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Cabello F. [Typhoid fever in Santiago]. Rev Med Chil 1990; 118:461-2. [PMID: 2133158] [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: 12/30/2022]
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25
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Cabello F. [Typhoid fever in Santiago]. Rev Med Chil 1989; 117:939-43. [PMID: 2519459] [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: 01/01/2023]
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26
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Aguero ME, de la Fuente G, Vivaldi E, Cabello F. ColV increases the virulence of Escherichia coli K1 strains in animal models of neonatal meningitis and urinary infection. Med Microbiol Immunol 1989; 178:211-6. [PMID: 2664439 DOI: 10.1007/bf00202554] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [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: 01/02/2023]
Abstract
Isogenic Escherichia coli strains, differing in their expression of K1 antigen and ColV plasmid, were studied for their ability to produce disease. Newborn rats were used to test the ability of these strains to colonize the intestine and to produce bacteremia and meningitis; adult rats were used to test their ability to produce urinary tract infection. Colonization of intestine and bladder by K1+ ColV+ E. coli was associated with rapid induction of bacteremia and higher mortalities compared with colonization with K1+ ColV- strains. These findings suggest that the ColV plasmid could play a role in the pathogenesis of human infections.
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Affiliation(s)
- M E Aguero
- Department of Microbiology and Immunology, New York Medical College, Valhalla 10595
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27
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Abstract
Existing evidence has convincingly established that young children often transmit cytomegalovirus (CMV) infection to their parents. What proportion of these parental infections lead to clinical disease is unknown, but this sequence of events is probably not rare. Physicians seeing young adults with prolonged but otherwise nondescript febrile illness should inquire about the presence of young children in the household. Parental CMV infection is not limited to parents whose children attend day-care centers or are cared for in neonatal intensive care units. As in our case of the febrile father, it may be strictly a family affair.
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Affiliation(s)
- R L Yarrish
- Department of Medicine, New York Medical College, Valhalla 10595
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28
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Fernández-Beros ME, Kissel V, Agüero ME, Figueroa G, D'Ottone K, Prado V, Cabello F. Further characterization of Escherichia coli O153:H45, an ETEC serotype disseminated in Chile. Can J Microbiol 1988; 34:85-8. [PMID: 3288317 DOI: 10.1139/m88-017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The newly described stable enterotoxin producing, enterotoxigenic Escherichia coli, serotype O153:H45, capable of expressing colonizing factor antigen I, is frequently isolated as a cause of diarrhea among Chilean children. Hybridization studies of five new strains confirmed previous results which indicated that the stable enterotoxin genes are contained in nonconjugative plasmids ranging in size from 81 to 87 kilobases. The strains expressed similar antibiotic resistance and metabolic properties but differed in their plasmid content.
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Affiliation(s)
- M E Fernández-Beros
- Department of Microbiology and Immunology, New York Medical College, Valhalla 10595
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Dworkin B, Wormser GP, Abdoo RA, Cabello F, Aguero ME, Sivak SL. Persistence of multiply antibiotic-resistant Campylobacter jejuni in a patient with the acquired immune deficiency syndrome. Am J Med 1986; 80:965-70. [PMID: 3706381 DOI: 10.1016/0002-9343(86)90646-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Chronic diarrhea due to Campylobacter jejuni has been described in patients with hypogammaglobulinemia. A patient with the acquired immune deficiency syndrome (AIDS) and normal total serum immunoglobulins had persistent diarrhea and C. jejuni on stool culture for seven and a half months despite repeated antibiotic therapy. Antibiotic sensitivity studies revealed the C. jejuni to be multiply antibiotic-resistant. Evaluation of the mechanism of resistance showed the organism harbored a conjugative plasmid capable of transferring resistance to tetracycline, but not to other antibiotics. It is concluded that C. jejuni infection may rarely result in chronic diarrhea in patients with AIDS. The combination of an immune deficiency state including abnormal B cell function previously described in AIDS and multiple antibiotic resistance may have contributed to the persistence of the organism in this case.
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31
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Schultz RJ, Harvey GP, Fernandez-Beros ME, Krishnamurthy S, Rodriguez JE, Cabello F. Bactericidal effects of the neodymium:YAG laser: in vitro study. Lasers Surg Med 1986; 6:445-8. [PMID: 3100891 DOI: 10.1002/lsm.1900060505] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The effects of laser energy on three bacterial strains, Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa were studied utilizing the neodymium:YAG laser. Cell suspensions of each strain were divided into four groups. In group I, suspensions from each strain were exposed to laser energy densities of 555-3,333 J/cm2. In groups II and III, two artificial dyes, congo red or methylene blue, were added to the suspensions prior to lasing. In group IVa, no laser energy was used, and group IVb was used to measure the bactericidal thermal effects of the laser. It was concluded that: Low dosages of laser energy exceeding 1,667 J/cm2 resulted in a 2 to 8 log decline in the number of viable bacterial colonies in vitro. Compared to the other two bacterial strains, P aeruginosa was the most sensitive to YAG laser irradiation. Addition of methylene blue, a dark-colored dye, enhanced the bactericidal effects of the YAG laser as indicated by the significantly reduced viability of P aeruginosa after irradiation with 2,222 J/cm2.
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Cabello F. [Human experimentation and human rights. Is biomedical experimentation in children permissible?]. Rev Med Chil 1986; 114:57-60. [PMID: 3764145] [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: 01/07/2023]
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33
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Cabello F. [Human experimentation, human rights and medical ethics]. Rev Med Chil 1984; 112:931-4. [PMID: 6533732] [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: 01/20/2023]
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34
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Cabello F, Agüero ME, Fernández ME. [Epidemics of typhoid fever in Chile: ecological and microbiological aspects]. Rev Med Chil 1984; 112:826-8. [PMID: 6533724] [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: 01/20/2023]
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35
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Cabello F. [Medical use of molecular cloning]. Rev Med Chil 1984; 112:697-705. [PMID: 6083592] [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: 01/18/2023]
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36
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Zilianti M, Cabello F, Chacón NR, Rincón CS, Salazar JR. Fetal scalp temperature during labor and its relation to acid-base balance and condition of the newborn. Obstet Gynecol 1983; 61:474-9. [PMID: 6828279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Fetal scalp temperature and fetal-maternal temperature gradient were studied during well-established labor in a group of 97 patients using a technique that ensured at the same time the adhesion and the thermal insulation of the probe. In 78 infants with a one-minute Apgar score of 7 or above, a positive gradient of 0.2C was maintained throughout labor between the warmer fetal scalp temperature (37.3C) and the maternal rectal temperature. Periodic drops of temperature related to the uterine contractions occurred in only 43% of the cases. In a group of ten infants with a one-minute Apgar score of 6 or below, the fetal-maternal gradient was significantly different from this schema. There was an inversion of the gradient, the fetal scalp temperature becoming cooler (36.9C) than the maternal rectal temperature. The gradient was -0.2C at the beginning of the study and -0.5C 20 minutes before delivery. Periodic drops of temperature with uterine contractions were constant. In dead fetuses, fetal scalp temperature was much below that of the mother and this difference increased steadily until delivery. A good relationship was found between fetal-maternal gradient and the pH of the umbilical artery blood sampled at birth. When the mean gradient was 0.2C +/- 1 SD, pH averaged 7.27; in the group below 1 SD, mean pH was 7.19 (P less than .01).
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37
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Andrés I, Slocombe PM, Cabello F, Timmis JK, Lurz R, Burkardt HJ, Timmis KN. Plasmid replication functions. II. Cloning analysis of the repA replication region of antibiotic resistance plasmid R6-5. Mol Gen Genet 1979; 168:1-25. [PMID: 372736 DOI: 10.1007/bf00267929] [Citation(s) in RCA: 70] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
R6-5 is a low copy number, conjugative, FII incompatibility group plasmid that has a molecular length of 102 kb and that specifies resistance against several antibiotics (chloramphenicol, fusidic acid, kanamycin, streptomycin and sulphonamide) and mercury salts. By means of in vitro cloning procedures, mini plasmids have been generated that contain a DNA segment from the essential region of R6-5 that is only 2.6 kb in length. This DNA segment, which consists of two PstI fragments that are adjacent in the parent plasmid, carries all genes and sequences required for the regulated replication and incompatibility properties of R6-5, including its origin of replication, OriV, an essential function that has been designated RepA, and the copy control function, Cop. Three different polypeptides, having monomer molecular weights of 23,000, 10,000 and 9,500 daltons, are synthesized in detectable quantities by minicells carrying pBR322 hybrid plasmids that contain DNA segments from the R6-5 essential region. A spontaneous deletion derivative of a pBR322 hybrid plasmid that carries the R6-5 origin of replication was isolated. Heteroduplex analysis of this derivative plasmid indicates that the deleted DNA segment carries the R6-5 replication origin and that its termini consist of short inverted repeat sequences.
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38
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Timmis KN, Cabello F, Andrés I, Nordheim A, Burkhardt HJ, Cohen SN. Instability of plasmid DNA sequences: macro and micro evolution of the antibiotic resistance plasmid R6-5. Mol Gen Genet 1978; 167:11-19. [PMID: 368583 DOI: 10.1007/bf00270316] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Detailed examination of the structure of cloned DNA fragments of the R6-5 antibiotic resistance plasmid has revealed a substantial degree of polynucleotide sequence heterogeneity and indicates that sequence rearrangements in plasmids and possible other replicons occur more frequently than has hitherto been appreciated. The sequences changes in cloned R6-5 fragments were shown in some instances to have occurred prior to cloning, i.e. existing in the original population of R6-5 molecules that was obtained from a single bacterial clone and by several different criteria judged to be homogeneous, and in others to have occurred either during the cloning procedure or during subsequent propagation of hybrid molecules. The molecular changes that are described involved insertion/deletion of the previously characterized IS2 insertion element, formation of a new inverted repeat structure probably by duplication of a preexisting R6-5 DNA sequence, sequence inversion, and loss and gain of restriction endonuclease cleavage sites.
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Timmis KN, Cabello F, Cohen SN. Cloning and characterization of EcoRI and HindIII restriction endonuclease-generated fragments of antibiotic resistance plasmids R6-5 and R6. Mol Gen Genet 1978; 162:121-37. [PMID: 672900 DOI: 10.1007/bf00267869] [Citation(s) in RCA: 151] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
DNA fragments generated by the EcoRI of HindIII endonucleases from the low copy number antibiotic resistance plasmids R6 and R6-5 were separately cloned using the high copy number ColE1 or pML21 plasmid vectors and the insertional inactivation procedure. The hybrid plasmids that were obtained were used to determine the location of the EcoRI and HindIII cleavage sites on the parent plasmid genomes by means of electron microscope heteroduplex analysis and agarose gel electrophoresis. Ultracentrifugation of the cloned fragments in caesium chloride gradients localized the high buoyant density regions of R6-5 to fragments that carry the genes for resistance to streptomycin-spectinomycin, sulfonamide, and mercury and a low buoyant density region to fragments that carry the tetracycline resistance determinant. Functional analysis of hybrid plasmids localized a number of plasmid properties such as resistances to antibiotics and mercury and several replication functions to specific regions of the R6-5 genome. Precise localisation of the genes for resistance to chloramphenicol, kanamycin, fusidic acid and tetracycline was possible due to the presence of identified restriction endonuclease cleavage sites within these determinants. Only one region competent for autonomous replication was identified on the R6-5 plasmid genome and this was localized to EcoRI fragment 2 and HindIII fragment 1. However, two additional regions of replication activity designated RepB and RepC, themselves incapable of autonomous replication but capable supporting replication of a linked ColE1 plasmid in polA- bacteria, were also identified.
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40
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Skurray RA, Guyer MS, Timmis K, Cabello F, Cohen SN, Davidson N, Clark AJ. Replication region fragments cloned from Flac+ are identical to EcoRI fragment f5 of F. J Bacteriol 1976; 127:1571-5. [PMID: 956131 PMCID: PMC232957 DOI: 10.1128/jb.127.3.1571-1575.1976] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The replication region fragments from Flac(+) cloned in plasmids pSC138 and pML31 are identical with each other and with EcoRI fragment 5 of plasmid F.
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42
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Timmis K, Cabello F, Cohen SN. Covalently closed circular DNA molecules of low superhelix density as intermediate forms in plasmid replication. Nature 1976; 261:512-6. [PMID: 778630 DOI: 10.1038/261512a0] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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43
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Abstract
Although it carries two competent replication systems, a composite plasmid formed in vitro by linkage of the complete ColE1 and pSC101 plasmid replicons at their unique EcoRI endonuclease cleavage sites normally uses only the replication origin and functions of the ColE1 component. Restriction of ColE1 replication functions by DNA polymerase I deprivation results, however, in exclusive use of the pSC101 replication origin. When using the ColE1 replication system the composite plasmid is nevertheless incompatible with both the parent replicons. This suggests that a trans-dominant gene product is involved in plasmid incompatibility and supports negative control rather than positive control models for regulation of the initiation of DNA replication.
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Timmis K, Cabello F, Cohen SN. Cloning, isolation, and characterization of replication regions of complex plasmid genomes. Proc Natl Acad Sci U S A 1975; 72:2242-6. [PMID: 1094460 PMCID: PMC432733 DOI: 10.1073/pnas.72.6.2242] [Citation(s) in RCA: 187] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
EcoRI endonuclease-generated DNA fragments carrying replication regions of the F'lac and R6-5 plasmids have been cloned and isolated, using as a selection vehicle a nonreplicating ampicillin-resistance DNA fragment derived from a Staphylococcus aureus plasmid. Heteroduplex analysis of the constructed plasmid chimeras and the parent replicons has localized the cloned R6-5 replication region to a DNA segment between kilobase pair coordinates 1.0 and 88.0 on the R6-5 map. Physical proximity between the plasmid replication functions and the locus governing plasmid incompatibility has been shown for both parent replicons. The cloning method reported appears to be generally applicable for the identification and isolation of replication regions of a variety of complex genomes.
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Timmis K, Cabello F, Cohen SN. Utilization of two distinct modes of replication by a hybrid plasmid constructed in vitro from separate replicons. Proc Natl Acad Sci U S A 1974; 71:4556-60. [PMID: 4612523 PMCID: PMC433926 DOI: 10.1073/pnas.71.11.4556] [Citation(s) in RCA: 84] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
A hybrid plasmid, pSC134, that codes for two distinct sets of replication functions has been constructed in vitro by ligation of EcoRI endonuclease-cleaved pSC101 and Col E1 plasmid replicons, and has been introduced into Escherichia coli by transformation. The replication properties of the pSC134 plasmid in DNA polymerase I-defective mutants or in the presence of chloramphenicol indicate that this hybrid plasmid can utilize the functionally distinct modes of replication specified by both of its parent replicons.
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Zilianti M, Segura CL, Cabello F, Benzaquen J, Romero M, Estrada MA. Studies on fetal bradycardia during birth process. I. Obstet Gynecol 1973; 42:831-9. [PMID: 4757589] [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: 01/12/2023]
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47
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Zilianti M, Segura CL, Cabello F, Benzaquen J, Caicedo CJ, Estrada MA. Studies on fetal bradycardia during birth process. II. Obstet Gynecol 1973; 42:840-3. [PMID: 4757590] [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: 01/12/2023]
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48
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Cabello F, Silva AB. [Bacterial resistance to antibiotics by extrachromosomal inheritance]. Rev Med Chil 1973; 101:216-22. [PMID: 4732136] [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: 01/12/2023]
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49
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Silva AB, Cabello F. [Multiple infectious antibiotic resistance in E. coli strains isolated from hospitals in Santiago. (Preliminary report)]. Rev Med Chil 1969; 97:697-700. [PMID: 4916504] [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: 01/13/2023]
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50
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Peyru GM, Silva A, Cabello F. ["Hospital" Staphylococcus aureus (mechanism and genetic resistance to penicillin)]. Rev Med Chil 1969; 97:304-12. [PMID: 4918419] [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: 01/13/2023]
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