Emilia Quesada

Czech Academy of Sciences, Institute of Biotechnology

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Victoria Béjar

Universidad de Granada

Inmaculada Llamas

Universidad de Granada

Fernando Martínez‐Checa

Universidad de Granada

Ana del Moral

Universidad de Granada

A. Ramos‐Cormenzana

Universidad de Granada

António Ventosa

Universidad de Sevilla

C. Calvo

Universidad de Granada

M. José Martínez-Cánovas

Universidad de Granada

F. Ruiz‐Berraquero

Universidad de Sevilla

María José Valderrama

Universidad Complutense de Madrid

Cooperative Institutions

Universidad de Granada

Universidad de Sevilla

Centre National de la Recherche Scientifique

Consejo Superior de Investigaciones Científicas

University of Alicante

Universidad de Las Palmas de Gran Canaria

Institut National Polytechnique de Toulouse

Université de Bordeaux

Parque Tecnológico de la Salud

Ifremer

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Exopolysaccharide production byVolcaniella eurihalina

Experientia (1993)

Emilia Quesada Victoria Béjar C. Calvo

Extracellular polysaccharide

Extracellular polymeric substance

10.1007/bf01929910

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Citations (105)

Numerical Taxonomy of Moderately Halophilic Gram-negative Rods

Microbiology (1982)

António Ventosa Emilia Quesada Francisco Rodríguez‐Valera F. Ruiz‐Berraquero A. Ramos‐Cormenzana

A study was made of 516 randomly selected isolates of moderately halophilic bacteria from solar salterns showing salinities between 8·8 and 40·0% (w/v) total salts, located in S.E. Spain. After purification, many cytological, physiological, biochemical, nutritional and antibiotic sensitivity characters were determined for 106 selected saltern isolates and two reference strains. Data were coded and analysed by numerical techniques using the Jaccard coefficient (SJ ), and clusters of strains were obtained by average linkage (UPGMA) analysis. Nine major phenons were found at the 72·5% similarity level. The properties of each phenon are given, their taxonomic affinities are discussed, and typical reference strains are suggested. Almost all the strains were related to genera known to contain marine species. A large number of the strains could be tentatively assigned to the genus Vibrio, suggesting that this may be an abundant taxon of moderately halophilic Gram-negative rods in solar salterns.

Numerical taxonomy

UPGMA

Jaccard index

Gram

Halotolerance

10.1099/00221287-128-9-1959

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Citations (517)

Exopolysaccharides produced by the recently described halophilic bacteria Halomonas ventosae and Halomonas anticariensis

Research in Microbiology (2006)

Juan Antonio Mata Victoria Béjar Inmaculada Llamas Soledad Arias Philippe Bressollier

Halomonas

Molecular mass

10.1016/j.resmic.2006.06.004

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Citations (159)

An exopolysaccharide produced by the novel halophilic bacterium Halomonas stenophila strain B100 selectively induces apoptosis in human T leukaemia cells

Applied Microbiology and Biotechnology (2010)

Carmen Ruiz‐Ruiz Girish K. Srivastava Diana Carranza Juan Antonio Mata Inmaculada Llamas

Strain (injury)

Halomonas

10.1007/s00253-010-2886-7

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Citations (89)

[Effect of nutritional conditions on the viscosity and emulsifying capacity of V2-7 biopolymer from Volcaniella eurihalina].

PubMed (1996)

Fernando Martínez‐Checa C. Calvo Caba Ma Ferrer Mr Victoria Béjar

Volcaniella eurihalina is a moderately halophilic bacterium able to produce an exopolysaccharide (EPS) under different culture conditions. Rheological behavior of 1% EPS solutions varied depending on the conditions under which EPS were produced. The maximum viscosity was reached when maltose was used as carbon source. Limitations of phosphorus and sulfur also increased its viscosity power. On the other hand, the addition of residual oil products to the culture medium enhanced the production of this biosurfactant polymer.

Biopolymer

Source

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Citations (2)

Types and properties of some bacteria isolated from hypersaline soils

Journal of Applied Bacteriology (1982)

Emilia Quesada António Ventosa Francisco Rodríguez‐Valera A. Ramos‐Cormenzana

Five rhizosphere soil samples from the dominant xerophytic plants, and nearby root‐free soil samples were obtained from a series of hypersaline soils (5.0–10.7% NaCl) from sites near Alicante in Spain. Physico‐chemical analyses were made, and the bacterial flora estimated using three different plating media. Counts from rhizosphere soil were always significantly higher than those from root‐free soils. A total of 211 strains isolated were purified and identified to genus level; 12 could not be classified. The range of salt concentration allowing growth was determined for each isolate, but this did not correlate with the salt content of the soil habitat. Most isolates appeared to be typical moderate halophiles (with optimum growth between 5 and 15% salts), but about half of them grew on normal media with only 0.9% naCl, a notable difference from moderately halophilic aquatic bacteria. Extreme halophiles were rare but this may have been due to an insufficient incubation period.

Flora

Salt pan

10.1111/j.1365-2672.1982.tb04671.x

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Citations (91)

Numerical Taxonomy of Moderately Halophilic Gram-negative Rods Isolated from the Salar de Atacama, Chile

Systematic and Applied Microbiology (1991)

B Prado Ana del Moral Emilia Quesada Rosemary Rios Mercedes Monteoliva‐Sánchez

UPGMA

Numerical taxonomy

Jaccard index

Gram

10.1016/s0723-2020(11)80381-4

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Citations (28)

A chemotaxonomic study of some moderately halophilic Gram‐positive isolates

Journal of Applied Bacteriology (1993)

M. Carmen Márquez Emilia Quesada Victoria Béjar António Ventosa

A chemotaxonomic study was carried out on some moderately halophilic Gram‐positive motile cocci, previously isolated from the Salar de Atacama (Chile) and grouped in two phenons (A and B) by numerical taxonomic analysis. Strains included in phenon A had a DNA base composition ranging between 42.0 and 44.0 mol%, while that of phenon B ranged from 48.0 to 48.8 mol%. The results of DNA‐DNA hybridization studies on representative strains from phenons A and B, indicated that the strains assigned to phenon A comprise a genomically homogeneous group, with a high degree of homology (80%) to the type strain of Marinococcus albus. Similarly, phenon B constituted a homogeneous group and the representative strain studied showed a DNA‐DNA homology of 70% with the type strain of Marinococcus halophilus. Representative strains studied from each phenon had meso‐diaminopimelic acid in the cell wall and menaquinone systems with seven isoprene units (MK‐7) as a major component. All these results, together with those previously reported, indicate that strains included in phenons A and B constitute additional strains of the species Marinococcus albus and Marinococcus halophilus , respectively.

Gram

Chemotaxonomy

Homology

Strain (injury)

10.1111/j.1365-2672.1993.tb01601.x

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Citations (9)

Alteromonas hispanica sp. nov., a polyunsaturated-fatty-acid-producing, halophilic bacterium isolated from Fuente de Piedra, southern Spain

INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY (2005)

Fernando Martínez‐Checa Victoria Béjar Inmaculada Llamas Ana del Moral Emilia Quesada

Strain F-32 T , which produces exopolysaccharides and contains polyunsaturated fatty acids, was isolated from a hypersaline water sample collected from Fuente de Piedra (southern Spain). Phylogenetic analyses indicated conclusively that the strain in question belonged to the genus Alteromonas . Phenotypic tests showed that it could be assigned to the genus Alteromonas although it had a number of distinctive characteristics: it is moderately halophilic, growing best with 7·5–10 % w/v NaCl; it grows at 4 °C and produces H 2 S; it does not grow with d -cellobiose, d -fructose, d -galactose, d -glucose or lactose as sole sources of carbon and energy; and its fatty-acid profile is typical of Alteromonas but it also contains a large amount of an unusual acid with three double bonds [18 : 3 ω 6 c (6, 9, 12); 5·01 %, w/v]. The major isoprenoid quinone is Q 8 . The DNA G+C content is 46·3 mol%. The phylogenetic, phenotypic and genetic properties of strain F-32 T place it within a novel species, for which the name Alteromonas hispanica sp. nov. is proposed. The type strain is F-32 T (=CECT 7067 T =LMG 22958 T ).

Alteromonas

10.1099/ijs.0.63809-0

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Citations (57)

Isolation and characterization of phage F9-11 from a lysogenicDeleya halophila strain

Current Microbiology (1988)

C. Calvo Ana García de la Paz Victoria Béjar Emilia Quesada A. Ramos‐Cormenzana

Euryhaline

Strain (injury)

Mitomycin C

10.1007/bf01568819

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Citations (31)