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Pérez JI, Álvarez-Arroyo R, Arrieta J, Suescun JM, Paunero S, Gómez MA. Occurrence of antibiotics and antibiotic-resistant bacteria (ARB) in the Nervión river. Chemosphere 2022; 288:132479. [PMID: 34626662 DOI: 10.1016/j.chemosphere.2021.132479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 09/17/2021] [Accepted: 10/03/2021] [Indexed: 06/13/2023]
Abstract
The main hydrometeorological, microbiological and physico-chemical characteristics of the Nervión river were monitored during a year, including 10 antibiotics and the presence of bacteria resistant to these antibiotics among faecal coliforms (FC) and total aerobic bacteria at 22 °C (TAB22). The characteristics of the river water were variable without a clear seasonal component, strongly influenced by rainfall, with a good quality for drinking water production throughout the year according to the physico-chemical parameters. The antibiotic resistant bacteria isolated from the water of the Nervión river were especially resistant to β-lactams and macrolide antibiotics, highlighting the absence of resistance to derivatives of tetracyclines among strains of TAB22. A third of the isolated strains were multi-resistant to antibiotics with a seasonal component in its presence, with multi-resistant FC more abundant during summer and multi-resistant TAB22 more abundant during winter. The presence of antibiotics in the waters of the Nervión river was not very significant, with total absence of β-lactams, minocycline and ciprofloxacin. Erythromycin and clarithromycin can be considered ubiquitous with mean concentrations of 2.5 ± 2.3 ngL-1 and 5.7 ± 4.6 ngL-1 respectively, and the presence of sulfamethoxazole and trimethoprim was also noticeable with maximum concentrations of 78.3 ngL-1 for sulfamethoxazole. Dilution due to the increase of rainfall was observed for several analysed antibiotics, but without significant seasonal differences.
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Affiliation(s)
- J I Pérez
- Technologies for Water Management and Treatment Research Group, University of Granada, Spain.
| | - R Álvarez-Arroyo
- Technologies for Water Management and Treatment Research Group, University of Granada, Spain.
| | - J Arrieta
- Department of Research and Development, CADAGUA S.A., Gran Vía 45, 7(a), 48011, Bilbao, Spain.
| | - J M Suescun
- Department of Research and Development, CADAGUA S.A., Gran Vía 45, 7(a), 48011, Bilbao, Spain.
| | - S Paunero
- Bilbao-Bizkaia Water Consortium, 48001, Bilbao, Spain.
| | - M A Gómez
- Technologies for Water Management and Treatment Research Group, University of Granada, Spain.
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2
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Abstract
The persistent motility of individual constituents in microbial suspensions represents a prime example of the so-called active matter systems. Cells consume energy, exert forces and move, overall releasing the constraints of equilibrium statistical mechanics of passive elements and allowing for complex spatio-temporal patterns to emerge. Moreover, when subject to physico-chemical stimuli their collective behaviour often drives large-scale instabilities of a hydrodynamic nature, with implications for biomixing in natural environments and incipient industrial applications. In turn, our ability to exert external control of these driving stimuli could be used to govern the emerging patterns. Light, being easily manipulable and, at the same time, an important stimulus for a wide variety of microorganisms, is particularly well suited to this end. In this paper, we will discuss the current state, developments and some of the emerging advances in the fundamentals and applications of light-induced bioconvection with a focus on recent experimental realizations and modelling efforts. This article is part of the theme issue 'Stokes at 200 (part 2)'.
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Affiliation(s)
- A. Javadi
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
- e-mail:
| | - J. Arrieta
- Instituto Mediterráneo de Estudios Avanzados, IMEDEA, UIB-CSIC, 07190 Esporles, Spain
| | - I. Tuval
- Instituto Mediterráneo de Estudios Avanzados, IMEDEA, UIB-CSIC, 07190 Esporles, Spain
- Departamento de Física, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
| | - M. Polin
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
- Centre for Mechanochemical Cell Biology, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
- e-mail:
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3
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Arrieta J, Jeanneret R, Roig P, Tuval I. On the fate of sinking diatoms: the transport of active buoyancy-regulating cells in the ocean. Philos Trans A Math Phys Eng Sci 2020; 378:20190529. [PMID: 32762433 PMCID: PMC7422867 DOI: 10.1098/rsta.2019.0529] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/02/2020] [Indexed: 06/11/2023]
Abstract
Diatoms are one of the most abundant, diverse and ecologically relevant phytoplanktonic group, contributing enormously to global biogeochemical processes like the carbon and silica cycles. This large success has been partly attributed to the mechanical and optical properties of the silica shell (the frustule) that envelops their body. But since they lack motility it is difficult to conceive how they cope with the fast-fluctuating environment they live in and where distributions of resources are very heterogeneous and dynamical. This pinpoints an important but yet poorly understood feature of diatoms physiology: buoyancy regulation that helps them controlling their sinking speed and position in the water column. While buoyancy regulation by light and nutrients availability has been well studied, the effect of hydromechanical stress via fluid shear has been rather overlooked when considering diatoms dynamics. Here, we aim to start filling this gap by first presenting direct experimental evidences for buoyancy control in response to hydro-mechanical stress and then review recent theoretical models where simple couplings between local shear and buoyancy control always result in heterogeneous cell distributions, specific accumulation regions within complex flows and increased sedimentation times to the depths, features of direct ecological relevance. We conclude by suggesting future experiments aiming to unveil such coupling and therefore gain better understanding on the fate of these fascinating microorganisms in their natural habitat. This article is part of the theme issue 'Stokes at 200 (part 2)'.
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Affiliation(s)
- J. Arrieta
- Instituto Mediterráneo de Estudios Avanzados, IMEDEA, UIB-CSIC, 07190 Esporles, Spain
| | - R. Jeanneret
- Laboratoire de Physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, F-75005 Paris, France
| | - P. Roig
- Instituto Mediterráneo de Estudios Avanzados, IMEDEA, UIB-CSIC, 07190 Esporles, Spain
| | - I. Tuval
- Instituto Mediterráneo de Estudios Avanzados, IMEDEA, UIB-CSIC, 07190 Esporles, Spain
- Departamento de Física, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
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4
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Rodriguez-Perez J, Palop L, Plaza C, Arrieta J. Perforation and/or Laceration of Posterior Peritoneum in Continuous Ambulatory Peritoneal Dialysis (CAPD). Perit Dial Int 2020. [DOI: 10.1177/089686088500500220] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
| | - L. Palop
- Division of Nephrology H. Ntra Sra del Pino Las Palmas de Gran Canarie Spain
| | - C. Plaza
- Division of Nephrology H. Ntra Sra del Pino Las Palmas de Gran Canarie Spain
| | - J. Arrieta
- Division of Nephrology H. Ntra Sra del Pino Las Palmas de Gran Canarie Spain
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5
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García de Lorenzo A, Arrieta J, Ayúcar A, Barril G, Huarte E. [Intra-dialysis parenteral nutrition in chronic renal patients: consensus SEN-SENPE]. NUTR HOSP 2010; 25:375-377. [PMID: 20593117] [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] [Received: 03/10/2010] [Accepted: 03/16/2010] [Indexed: 05/29/2023] Open
Abstract
Given the high prevalence of the hyponutrition state among haemodialysis patients and knowing that this implies an increase in the rates of infection, hospitalisation and hospital stay, which translates into an increase in global morbid-mortality, the Spanish Society of Nephrology (SEN) and the Spanish Society of Parenteral and Enteral Nutrition (SENPE) have reached a consensus on the indications, contraindications, and limitations of Intra-Dialysis Parenteral Nutrition (IDPN.) This consensus considers IDPN as a valid alternative to other types of nutritional support when these show their lack of efficacy. The bases are set regarding the timing of nutritional intervention with IDPN, its ideal composition, the time of administration, its controls, follow-up schedules, and the time at which the nutritional support has to be discontinued.
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Bajo MA, Selgas R, Remón C, Arrieta J, Alvarez-Ude F, Arenas MD, Borrás M, Coronel F, García-Ramón R, Minguela I, Pérez-Bañasco V, Pérez-Contreras J, Fontán MP, Teixidó J, Tornero F, Vega N. [Scientific-technical quality and ongoing quality improvement plan in peritoneal dialysis]. Nefrologia 2010; 30:28-45. [PMID: 20098469 DOI: 10.3265/nefrologia.pre2010.jan.10205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Affiliation(s)
- M A Bajo
- Hospital Universitario La Paz, Madrid, Spain.
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7
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Arrieta J, Castro P, Gutiérrez Avila G, Moreno Alía I, Sierra T, Estébanez C, Olmos AM, González R, Fernández Renedo C, Arias M, Cotorruelo J, Martín de Francisco AL, Zurriaga O, García Blasco MJ, Clèries M, Vela E, García Bazaga MDLA, Ramos JM, Gil Paraíso A, Sánchez Casajús A, Unzue JJ, Purroy A, Arteaga J, Asín JL, Gorostiza G, Torralba A, Vázquez C, Magaz A. [Dialysis and transplant situation, Spain 2004]. Nefrologia 2007; 27:279-99. [PMID: 17725448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023] Open
Affiliation(s)
- J Arrieta
- Servicio de Nefrología, Hospital de Basurto, Bilbao.
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8
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Arrieta J, Bajo MA, Caravaca F, Coronel F, García-Pérez H, González-Parra E, Granado A, Martín-Govantes J, Miguel A, Molina A, Montenegro J, Pérez-Bañasco V, Pérez-Fontán M, Remón-Rodríguez C, Rodríguez-Palomares JR, Ruiz C, Sánchez-Moreno A, Vega N. [Guidelines of the Spanish Society of Nephrology. Clinical practice guidelines for peritoneal dialysis]. Nefrologia 2006; 26 Suppl 4:1-184. [PMID: 16953544] [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: 05/11/2023] Open
Abstract
In Spain and in each of its autonomous communities, the dialysis treatment of chronic renal disease stage 5 is totally covered by public health. Peritoneal dialysis, in any of its modalities, is established as the preferred home dialysis technique and is chosen by high percentage of patients as their choice in dialysis treatment. The Spanish Society of Nephrology has promoted a project of creation of performance guides in the field of peritoneal dialysis, entrusting a work group composed of members of the Spanish Society of Nephrology a with the development of these guides. The information offered is based on levels of evidence, opinion and clinical experience of the most relevant publications of the topic. In these guides, after defining the concept of << peritoneal dialysis>>, the obligations and responsibilities of the sanitation team of the peritoneal dialysis unit are determined, and protocols and performance procedures that try to include all the aspects that concern the patient with chronic renal disease in substitute treatment with this technique are developed. They propose prescription objectives based on available clinical evidence and, lacking this, on the consensus of the experts' opinions. The final aim is to improve the care and quality of the of the patient in peritoneal dialysis, optimizing in this way the survival of the patient and of the technique. In Spain, as in other neighbouring countries, peritoneal dialysis has an incidence and prevalence that is much lower than that of hemodialysis, ranging in the last evaluation by the Spanish Society of Nephrology between 5 and 24% in the different autonomous communities. The great majority of peritoneal dialysis units form part of the public network of the Spanish state, with special representation as a Satellite Unit or Concerted Center related to the public hospital of reference, on which it must depend.
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9
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Rodríguez Hernández JA, González Parra E, Julián Gutiérrez JM, Segarra Medrano A, Almirante B, Martínez MT, Arrieta J, Fernández Rivera C, Galera A, Gallego Beuter J, Górriz JL, Herrero JA, López Menchero R, Ochando A, Pérez Bañasco V, Polo JR, Pueyo J, Ruiz CI, Segura Iglesias R. [Vascular access guidelines for hemodialysis]. Nefrologia 2005; 25 Suppl 1:3-97. [PMID: 15791773] [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: 05/02/2023] Open
Abstract
Quality of vascular access (VA) has a remarkable influence in hemodialysis patients outcomes. Dysfunction of VA represents a capital cause of morbi-mortality of these patients as well an increase in economical. Spanish Society of Neprhology, aware of the problem, has decided to carry out a revision of the issue with the aim of providing help in comprehensión and treatment related with VA problems, and achieving an homogenization of practices in three mayor aspects: to increase arteriovenous fistula utilization as first vascular access, to increment vascular access monitoring practice and rationalise central catheters use. We present a consensus document elaborated by a multidisciplinar group composed by nephrologists, vascular surgeons, interventional radiologysts, infectious diseases specialists and nephrological nurses. Along six chapters that cover patient education, creation of VA, care, monitoring, complications and central catheters, we present the state of the art and propose guidelines for the best practice, according different evidence based degrees, with the intention to provide help at the professionals in order to make aproppiate decissions. Several quality standars are also included.
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10
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Arrieta J. [Off label prescription in nephrology]. Nefrologia 2005; 25:103-5. [PMID: 15912645] [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: 05/02/2023] Open
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Soria M, Arrieta J, Ugarte I, Moina I, Guerra M, Escanero J. [Intracellular pH changes induced by sclerosing agents in peritoneal fibroblasts]. Nefrologia 2004; 24:158-66. [PMID: 15219091] [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: 04/30/2023] Open
Abstract
UNLABELLED Sclerosing encapsulating peritonitis secondary to peritoneal dialysis has been associated to acetate-containing dialysis fluids, hypertonic glucose and disinfectants. Physiopathologic mechanisms of fibrotic proliferation that implicate those agents are not totally explained. With an experimental approach using cultured peritoneal fibroblasts, we have studied intracellular pH changes and Na+/H+ antiporter activity under cells perfusion with peritoneal dialysis liquids containing acetate, lactate, hypertonic glucose and interleukin-1. All experiments were performed at extracellular pH 7.4 and physiologic HCO3/CO2 concentration. RESULTS 35 mM acetate produced a huge intracellular acidosis (ipH = 6.80 +/- 0.08). Lactate effect was less important (6.95 +/- 0.07), with a slow ipH recovery in about 30 min in both cases. IL-1, 10(-6) M also reduced ipH to 7.10 +/- 0.03. Acidosis was linked to Ca2+ outflow via Ca/H exchange and was blocked with Cd 20 nM. Extracellular Na = 0 and amiloride totally inhibited ipH recovery after acetate, lactate, or interleukin-induced acidosis. Hypertonic glucose perfusion increased ipH (7.31 +/- 0.06) for 5-7 min. This increase was also inhibited by amiloride or extracellular Na absence. Na+/H+ exchanger activity increased to 58%, and kept activated after ipH recovery. In conclusion, acetate, hypertonic glucose and IL-1 showed the common effect of stimulating the sodium-proton exchanger by different mechanisms, giving a possibility of potentiation. Activated Na+/H+ exchanger may act as a signal-transduction increasing fibroblast proliferation and explaining the cellular mechanism of sclerosing peritonitis.
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Affiliation(s)
- M Soria
- Dpto. Bioquímica, Universidad de Zaragoza
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12
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Arrieta J. [The macrolaboratory and analytical quality in nephrology. A personal experience]. Nefrologia 2002; 21:519-21. [PMID: 11881419] [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: 02/24/2023] Open
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13
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Hernández L, Ramírez R, Hormaza JV, Madrazo J, Arrieta J. Increased levansucrase production by a genetically modified
Acetobacter diazotrophicus
strain in shaking batch cultures. Lett Appl Microbiol 2002. [DOI: 10.1046/j.1365-2672.1999.00470.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- L. Hernández
- Laboratorio de Interacciones Planta‐Microorganizmos, División de Plantas, Centro de Ingeniería Genética y Biotecnología, Ciudad Habana,
| | - R. Ramírez
- Laboratorio de Interacciones Planta‐Microorganizmos, División de Plantas, Centro de Ingeniería Genética y Biotecnología, Ciudad Habana,
| | - J. V. Hormaza
- Instituto Cubano de Investigaciones Azucareras, La Habana, and
| | - J. Madrazo
- División de Química‐Física, Ciudad Habana, Cuba
| | - J. Arrieta
- Laboratorio de Interacciones Planta‐Microorganizmos, División de Plantas, Centro de Ingeniería Genética y Biotecnología, Ciudad Habana,
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Abstract
The crude ethanol extract from the leaves of Zanthoxylum liebmannianum exhibited inhibitory effect on the reproduction of trophozoites of Entamoeba histolytica (IC(50)=3.48 microg/ml) and Giardia lamblia (IC(50)=58.00 microg/ml). From this extract, asarinin, hyperin, beta-sitosterol, and beta-sitosterol glucoside were isolated. Among them, asarinin was the most active with IC(50) values of 19.86 microg/ml for E. histolytica and 35.45 microg/ml for G. lamblia. The remaining compounds showed moderate activity against both parasites.
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Affiliation(s)
- J Arrieta
- Facultad de Química, Departamento de Farmacia, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán 04510, México D.F., Mexico
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15
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Hernández L, Sotolongo M, Rosabal Y, Menéndez C, Ramírez R, Caballero-Mellado J, Arrieta J. Structural levansucrase gene (lsdA) constitutes a functional locus conserved in the species Gluconacetobacter diazotrophicus. Arch Microbiol 2000; 174:120-4. [PMID: 10985751 DOI: 10.1007/s002030000173] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [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
Levansucrase (EC 2.4.1.10) was identified as a constitutive exoenzyme in 14 Gluconacetobacter diazotrophicus strains recovered from different host plants in diverse geographical regions. The enzyme, consisting of a single 60-kDa polypeptide, hydrolysed sucrose to synthesise oligofructans and levan. Sugar-cane-associated strains of the most abundant genotype (electrophoretic type 1) showed maximal values of levansucrase production. These values were three-fold higher than those of the isolates recovered from coffee plants. Restriction fragment length polymorphism analysis revealed a high degree of conservation of the levansucrase locus (IsdA) among the 14 strains under study, which represented 11 different G. diazotrophicus genotypes. Targeted disruption of the lsdA gene in four representative strains abolished their ability to grow on sucrose, indicating that the endophytic species G. diazotrophicus utilises plant sucrose via levansucrase.
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Affiliation(s)
- L Hernández
- Centro de Ingeniería Genética y Biotecnología, División de Plantas, Laboratorio de Interacciones Planta-Microorganismos, Habana, Cuba.
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Hernández L, Arrieta J, Betancourt L, Falcón V, Madrazo J, Coego A, Menéndez C. Levansucrase from Acetobacter diazotrophicus SRT4 is secreted via periplasm by a signal-peptide-dependent pathway. Curr Microbiol 1999; 39:146-52. [PMID: 10441728 DOI: 10.1007/s002849900436] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Acetobacter diazotrophicus SRT4 secretes a constitutive levansucrase (LsdA) (EC 2.4.1.10) that is responsible for sucrose utilization. Immunogold electron microscopical studies revealed that LsdA accumulates in the periplasm before secretion. The periplasmic and extracellular forms of the enzyme were purified to homogeneity. Both proteins exhibited similar physical and biochemical characteristics indicating that LsdA adopts its final conformation in the periplasm. The N-terminal sequence of mature LsdA was pGlu-Gly-Asn-Phe-Ser-Arg as determined by PSD-MALDI-TOFMS (post-source decay-matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry). Comparison of this sequence with the predicted precursor protein revealed the cleavage of a 30-residue typical signal peptide followed by the formation of the pyroglutamic acid (pGlu) residue. Thus, in contrast with other Gram-negative bacteria, A. diazotrophicus secretes levansucrase by a signal-peptide-dependent mechanism.
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Affiliation(s)
- L Hernández
- Centre for Genetic Engineering and Biotechnology, Plant Division, P. O. Box 6162, Havana 10600, Cuba
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17
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Batista FR, Hernández L, Fernández JR, Arrieta J, Menéndez C, Gómez R, Támbara Y, Pons T. Substitution of Asp-309 by Asn in the Arg-Asp-Pro (RDP) motif of Acetobacter diazotrophicus levansucrase affects sucrose hydrolysis, but not enzyme specificity. Biochem J 1999; 337 ( Pt 3):503-6. [PMID: 9895294 PMCID: PMC1220002] [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: 02/09/2023]
Abstract
beta-Fructofuranosidases share a conserved aspartic acid-containing motif (Arg-Asp-Pro; RDP) which is absent from alpha-glucopyranosidases. The role of Asp-309 located in the RDP motif of levansucrase (EC 2.4.1.10) from Acetobacter diazotrophicus SRT4 was studied by site-directed mutagenesis. Substitution of Asp-309 by Asn did not affect enzyme secretion. The kcat of the mutant levansucrase was reduced 75-fold, but its Km was similar to that of the wild-type enzyme, indicating that Asp-309 plays a major role in catalysis. The two levansucrases showed optimal activity at pH 5.0 and yielded similar product profiles. Thus the mutation D309N affected the efficiency of sucrose hydrolysis, but not the enzyme specificity. Since the RDP motif is present in a conserved position in fructosyltransferases, invertases, levanases, inulinases and sucrose-6-phosphate hydrolases, it is likely to have a common functional role in beta-fructofuranosidases.
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Affiliation(s)
- F R Batista
- Centre for Genetic Engineering and Biotechnology (CIGB), P.O. Box 6162, Havana 10600, Cuba
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18
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Darpon J, Arrieta J, Elorrieta P, Olaizola P, Lavari R, Aranzabal J. Evaluation of a small organ procurement organization in the Basque country, Spain. J Transpl Coord 1996; 6:167-70. [PMID: 9188378 DOI: 10.7182/prtr.1.6.4.9601xq11q187247m] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A limited supply of organs is the main obstacle for organ transplantation. The shortage reflects not only a shortage of donors but also a failure to make use of existing donors. The Basque Country Transplant Coordination Team is an organ procurement organization that operates in the Basque country, an area of 7260 km2 with 2.1 million inhabitants. From January 1, 1990, to December 31, 1995, the number of potential cadaveric organ donors found by the team increased, to 70 donors per million inhabitants in 1995. Since 1993, the organization has had more than 30 donors per million persons and has procured more than 90 cadaveric organs, including more than 60 cadaveric kidneys, per million persons. Because of these rates, the team coordinated 61.7 cadaveric kidney transplants per million persons during 1995. This paper describes some characteristics of the Basque organ procurement organization that might explain these results.
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Affiliation(s)
- J Darpon
- Basque National Health Service, Osakidetza, Bilbao, Spain
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19
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Corvera G, Céspedes B, Ysunza A, Arrieta J. Ambulatory vs. In-Patient Stapedectomy: A Randomized Twenty-Patient Pilot Study. Otolaryngol Head Neck Surg 1996; 114:355-9. [PMID: 8649867 DOI: 10.1016/s0194-59989670203-6] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A prospective study was undertaken to determine whether stapedectomy can safely be performed in an outpatient setting. Twenty patients with otosclerosis amenable to surgical treatment were divided into two groups; those in the hospitalized group were admitted the day before surgery and discharged 24 hours after the procedure. The patients in the ambulatory group were admitted on the day surgery was scheduled and released 1 or 2 hours after the procedure. We analyzed the intensity and duration of postoperative vertigo, and the hearing gain obtained, studying the speech frequencies (500 to 2000 Hz) separately from the high frequencies (4000 to 8000 Hz). No significant difference was found at 4, 3, and 6 months of follow-up in any of the parameters studied, concluding that small-fenestra stapedectomy can safely be performed as an outpatient procedure.
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Affiliation(s)
- G Corvera
- Department of Otorhinolaryngology, Hospital General "Dr. Manuel Gea González", Mexico City, Mexico
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20
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Abstract
A prospective study was undertaken to determine whether stapedectomy can safely be performed in an outpatient setting. Twenty patients with otosclerosis amenable to surgical treatment were divided into two groups; those in the hospitalized group were admitted the day before surgery and discharged 24 hours after the procedure. The patients in the ambulatory group were admitted on the day surgery was scheduled and released 1 or 2 hours after the procedure. We analyzed the intensity and duration of postoperative vertigo, and the hearing gain obtained, studying the speech frequencies(500 to 2000 Hz) separately from the high frequencies (4000 to 8000 Hz). No significant difference was found at 1, 3, and 6 months of follow-up in any of the parameters studied, concluding that small-fenestra stapedectomy can safely be performed as an outpatient procedure.
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Affiliation(s)
- G Corvera
- Department of Otorhinolaryngology, Hospital General "Dr. Manuel Gea González", Mexico City, Mexico
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21
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Hernandez L, Arrieta J, Menendez C, Vazquez R, Coego A, Suarez V, Selman G, Petit-Glatron MF, Chambert R. Isolation and enzymic properties of levansucrase secreted by Acetobacter diazotrophicus SRT4, a bacterium associated with sugar cane. Biochem J 1995; 309 ( Pt 1):113-8. [PMID: 7619044 PMCID: PMC1135807 DOI: 10.1042/bj3090113] [Citation(s) in RCA: 97] [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: 01/26/2023]
Abstract
Acetobacter diazotrophicus, a nitrogen-fixing bacterium associated with sugar cane, secretes a levansucrase (sucrose-2,6-beta-D-fructan 6-beta-D-fructosyltransferase; EC 2.4.1.10). This enzyme is constitutively expressed and represents more than 70% of the total proteins secreted by strain SRT4. The purified protein consists of a single 58 kDa polypeptide with an isoelectric point of 5.5. Its activity is optimal at pH 5.0. It catalyses transfructosylation from sucrose to a variety of acceptors including water (sucrose hydrolysis), glucose (exchange reaction), fructan (polymerase reaction) and sucrose (oligofructoside synthesis). In vivo the polymerase activity leads to synthesis of a high-molecular-mass fructan of the levan type. A. diazotrophicus levansucrase catalyses transfructosylation via a Ping Pong mechanism involving the formation of a transient fructosyl-enzyme intermediate. The catalytic mechanism is very similar to that of Bacillus subtilis levansucrase. The kinetic parameters of the two enzymes are of the same order of magnitude. The main difference between the two enzyme specificities is the high yield of oligofructoside, particularly 1-kestotriose and kestotetraose, accumulated by A. diazotrophicus levansucrase during sucrose transformation. We discuss the hypothesis that these catalytic features may serve the different biological functions of each enzyme.
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Affiliation(s)
- L Hernandez
- Center for Genetic Engineering and Biotechnology, Agriculture Division, Havana, Cuba
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22
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Mijac V, Arrieta J, Mendt C, Valbuena H, Ryder E. [Role of environmental factors in the development of insulin-dependent diabetes mellitus (IDDM) in Venezuelan children]. Invest Clin 1995; 36:73-82. [PMID: 7548302] [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] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
In view of the controversy surrounding the role of environmental factors, such as the presence of bovine albumin in milk, or viral infections, in the etiology of IDDM, a study was undertaken to determine the relationship between these events and the subsequent risk of developing IDDM. On 40 venezuelan diabetic children (< 18 y) and forty, age, sex and race-matched controls were studied at the same time. Parents of children completed a questionnaire on the infant's feeding habits, its environment and family history. The X2 method and the Fischer's exact test were used to analyze the results. We found that 20% of the controls, and 10% of IDDM (NS), were never breast-fed. In 95% of controls vs 65% of IDDM (p < 0.001), cow's milk was given exclusively from birth, or combined with breast-feeding, 65% of IDDM and 60% of controls (NS) were breast-fed (alone or combined with milk substitutes) for more than three months. These results do not support the hypothesis that early exposure to breast milk substitutes increases the risk of IDDM in venezuelan children. The study revealed, however, that a family history of diabetes mellitus was present in 55% of IDDM vs 30% of controls (p < 0.05) and mumps infection before the onset of diabetes was recorded in 42.5% of IDDM in comparison with 12.5% of controls (p = 0.005). Other viral infections (rubella, chicken pox) had no statistical significance. The latter results suggest an association between a family history of diabetes mellitus and viral infections with the development of IDDM among this group of children.
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Affiliation(s)
- V Mijac
- Instituto de Investigaciones Clínicas, Facultad de Medicina, Universidad del Zulia, Maracaibo, Venezuela
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23
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Daugirdas JT, Arrieta J, Ye M, Flores G, Battle DC. Intracellular acidification associated with changes in free cytosolic calcium. Evidence for Ca2+/H+ exchange via a plasma membrane Ca(2+)-ATPase in vascular smooth muscle cells. J Clin Invest 1995; 95:1480-9. [PMID: 7706452 PMCID: PMC295630 DOI: 10.1172/jci117819] [Citation(s) in RCA: 40] [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: 01/26/2023] Open
Abstract
The purpose of this study was to define the mechanism whereby agonists that increase free cytosolic calcium (Cai2+) affect intracellular pH (pHi) in smooth muscle. Rat aortic vascular smooth muscle cells grown on coverslips were loaded with BCECF/AM or fura-2/AM for continuous monitoring of pHi or Cai2+, respectively, in a HCO3-/CO2- containing medium. Recovery from rapid increases in Cai2+ produced by 1 microM angiotensin (Ang) II (delta Cai2+ -229 +/- 43 nM) or 1 microM ionomycin (delta Cai2+ -148 +/- 19 nM) was accompanied by a fall in pHi (delta pHi, -0.064 +/- 0.0085 P < 0.01, and -0.05 +/- 0.012 pH units, P < 0.01, respectively). Neither the fall in pHi nor the rise in Cai2+ elicited by Ang II was prevented by pretreatment with agents which block the action of this agonist on pHi via the stimulation of the Cl/HCo3 exchangers (DIDS, 50 microM) or the Na+/H+ antiporter (EIPA, 50 microM). In the presence of DIDS and EIPA, Ang II produced a fall in pHi (delta pHi, -0.050 +/- 0.014, P < 0.01) and a rise in Cai2+ (delta Ca2+ 252 +/- 157 nM, P < 0.01). That the change in pHi was secondary to changes in Cai2+ was inferred from the finding that, when the rise in Cai2+ elicited by Ang II was prevented by preincubation with a Ca2+ buffer, BAPTA (60 microM), the fall in pHi was abolished as well (delta pHi, 0.0014 +/- 0.0046). The pHi fall produced by Ang II and ionomycin was prevented by cadmium at a very low concentration (20 nM) which is known to inhibit plasma membrane Ca(2+)-ATPase activity (delta pHi -0.002 +/- 0.0006 and -0.0016 pH units, respectively). Cadmium also blunted Cai2+ recovery after Ang II and ionomycin. These findings suggest that the fall in pHi produced by these agents is due to H+ entry coupled to Ca2+ extrusion via the plasma membrane Ca(2+)-ATPase. Our results indicate that agonists that increase Cai2+ cause intracellular acidification as a result of Ca2+/H+ exchange across the plasma membrane. This process appears to be mediated by a plasma membrane Ca(2+)-ATPase which, in the process of extruding Ca2+ from the cell, brings in [H+] and thus acidifies the cell.
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Affiliation(s)
- J T Daugirdas
- Department of Medicine, Northwestern University Medical School, Chicago, Illinois 60611, USA
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24
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Mijares J, Pérdigo L, Neyro MT, Arrieta J, Montenegro J, Aranzabal J. Donor detection and organ procurement in the Basque Autonomous Community: general data. Transplant Proc 1991; 23:2543. [PMID: 1926471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- J Mijares
- Basque Health Service, Hospital de Cruces, Bilbao, Spain
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25
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Gutierrez Calzada JL, Martinez JL, Baena V, Laguna G, Arrieta J, Rodriguez J, Moncada A. En bloc kidney and bladder transplantation from an anencephalic donor into an adult recipient. J Urol 1987; 138:125-6. [PMID: 3298688 DOI: 10.1016/s0022-5347(17)43017-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The visceral block, composed of both kidneys and their vascular pedicles, inferior vena cava, ureters and bladder, was removed from a 3-day-old male anencephalic donor and transplanted into a 32-year-old adult in chronic renal failure. The urinary tract was reconstructed by vesicovesicostomy for technical ease, and prevention of reflux and ureteral stenosis. Maximum urine output was 150 ml. per day and the kidney grafts were lost owing to rejection 5 months after transplantation.
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Cabarcos A, Arrieta J, Damiano A, Quiroga J, Esteban L, Yagüe S. [Apropos of a case of Conn's disease. Use of computerized axial tomography in the differential diagnosis from hyperaldosteronism]. Rev Med Univ Navarra 1981; 25:43-7. [PMID: 7344042] [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: 01/24/2023]
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