Guangyu Li

State Oceanic Administration, Tsingtao, Shandong Sheng, China

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Publications (12)22.42 Total impact

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    ABSTRACT: A taxonomic study was carried out on strain 22II-S11-z10(T), which was isolated from the surface seawater of the Atlantic Ocean. The bacterium was found to be Gram-stain negative, oxidase and catalase positive, oval- to rod-shaped and non-motile. Growth was observed at salinities of 0.5-9 % and at temperatures of 10-41 °C. The isolate can reduce nitrate to nitrite, degrade gelatin and aesculin, but can not degrade Tween 80. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 22II-S11-z10(T) belongs to the genus Actibacterium, with the highest sequence similarity to the type strain Actibacterium mucosum CECT 7668(T) (97.3 %). The DNA-DNA hybridization estimate value between strain 22II-S11-z10(T) and A. mucosum CECT 7668(T) was 19.30 ± 2.29 %. The principal fatty acids were identified as Summed Feature 8 (C18:1 ω7c/ω6c as defined by the MIDI system, 75.2 %) and Summed Feature 3 (C16:1 ω7c/ω6c, 6.9 %). The G+C content of the chromosomal DNA was determined to be 59.0 mol%. The respiratory quinone was determined to be Q-10 (100 %). Phosphatidylglycerol, phosphatidylcholine, two phospholipids, two aminolipids and two lipids were identified in the polar lipids. The combined genotypic and phenotypic data show that strain 22II-S11-z10(T) represents a novel species within the genus Actibacterium, for which the name Actibacterium atlanticum sp. nov. is proposed, with the type strain 22II-S11-z10(T) (=MCCC 1A09298(T) = LMG 27158(T)).
    Antonie van Leeuwenhoek 06/2014; · 2.07 Impact Factor
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    ABSTRACT: A taxonomic study was carried out on strain 22II-S11-z7(T), which was isolated from the surface seawater of the Atlantic Ocean. The bacterium was found to be Gram-negative, oxidase negative and catalase positive, long-rod shaped, and gliding. Growth was observed at salinities of 1-5 % and at temperatures of 10-41 °C. The isolate was capable of hydrolysing gelatin and Tween 80 and able to reduce nitrate to nitrite, but unable to degrade aesculin. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 22II-S11-z7(T) belongs to the genus Aquimarina, with highest sequence similarity to Aquimarina megaterium XH134(T) (98.31 %), followed by Aquimarina macrocephali JAMB N27(T) (96.59 %); other species of the genus Aquimarina shared 93.63-96.08 % sequence similarity. The ANI value between strain 22II-S11-z7(T) and A. megaterium XH134(T) was found to be 91.86-91.81 %. The DNA-DNA hybridization estimated value between strain 22II-S11-z7(T) and A. megaterium XH134(T) was 47.7 ± 2.6 %. The principal fatty acids were identified as Summed Feature 3 (C16:1 ω7c/ω6c, as defined by the MIDI system; 8.1 %), SummedFeature 9 (iso-C17:1 ω7c/C16:110-methyl; 6.8 %), iso-C15:0 G (11.3 %), iso-C15:0 (24.9 %), iso-C16:0 (5.7 %), C16:0 (5.2 %), iso-C15:0 3OH (6.4 %) and iso-C17:0 3OH (21.5 %). The G+C content of the chromosomal DNA was determined to be 32.99 mol %. The respiratory quinone was determined to be MK-6 (100 %). Phosphatidylethanolamine, two unidentified aminolipids, five unidentified phospholipids and two unidentified lipids were found to be present. The combined genotypic and phenotypic data show that strain 22II-S11-z7(T) represents a novel species within the genus Aquimarina, for which the name Aquimarina atlantica sp. nov. is proposed, with the type strain 22II-S11-z7(T) (=MCCC 1A09239(T) = KCTC 42003(T)).
    Antonie van Leeuwenhoek 06/2014; · 2.07 Impact Factor
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    ABSTRACT: A taxonomic study was carried out on strain 22II-S10r2(T), which was isolated from the deep sea sediment of the Atlantic Ocean using oil-degrading enrichment. The bacterium was Gram-negative, oxidase positive and catalase negative, spherical in shape, and motile by polar flagella. Growth was observed at salinities of 0.5-7 % and at temperatures of 10-41 °C. The isolate was capable of aesculin hydrolysis, but unable to reduce nitrate to nitrite or degrade Tween 80 or gelatine. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 22II-S10r2(T) belonged to the family Ectothiorhodospiraceae, with highest sequence similarity to Thioalkalivibrio sulfidiphilus HL-EbGR7(T) (90.9 % similarity). The principal fatty acids were Sum In Feature 8 (C18:1 ω7c/ω6c (29.9 %), C18:1 ω9c (13.5 %), C16:1 ω5c (12.3 %), C12:03OH (6.8 %), C18:1 ω5c (5.7 %) and C16:0 (5.3 %). The G+C content of the chromosomal DNA was 60.7 mol%. The respiratory quinone was determined to be Q-7 (25 %) and Q-8 (75 %). Phosphatidylethanolamine, phosphatidylglycerol, aminophospholipid, glycolipid, three phospholipids and lipid were present. The strain was aerobic, non-phototrophic and non-chemolithoautotrophic. The combined genotypic and phenotypic data show that strain 22II-S10r2(T) represents a novel species within a novel genus, for which the name Maricoccus atlantica gen. nov. sp. nov. is proposed, with the type strain 22II-S10r2(T) (=CGMCC NO.1.12317(T) = LMG 27155(T) = MCCC 1A09384(T)).
    Antonie van Leeuwenhoek 09/2013; · 2.07 Impact Factor
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    ABSTRACT: A taxonomic study was carried out on strain 22II14-10F7T, which was isolated from the deep sea water of the Atlantic Ocean with oil-degrading enrichment. The bacterium was Gram-negative, oxidase- and catalase-positive, rod-shape. Growth was observed at salinities from 0.5 to 15 % and at temperatures from 4 to 37 °C, it was unable to hydrolyze Tween 40, 80 or gelatin. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 22II14-10F7T belonged to the genus Zunongwangia, with highest sequence similarity of 97.3 % to Zunongwangia profunda SM-A87T, while the others were all below 94.0 %. The DDH estimate value between strain 22II14-10F7T and Z. profunda SM-A87T was 27.20 ±2.43% according to their genome sequences. The principal fatty acids were iso-C15:0 (22.42 %), C15:0 anteiso (8.90 %), iso-C15:1G (8.50 %), iso-C17:0 3OH (12.78 %), Sum In Feature 3 (C16:1ω7c /ω6c) (8.09 %) and Sum In Feature 9 (iso-C17:1ω9c or C16:0 10-methyl) (13.54 %). The G+C content of the chromosomal DNA was 35.5 mol%. The major respiratory quinone was determined to be MK-6. Phosphatidylethanolamine (PE), two aminolipids (AL1 and AL2) and five unknown lipids (L1-L5) were present. The combined genotypic and phenotypic data show that strain 22II14-10F7T represents a novel species of the genus Zunongwangia, for which the name Zunongwangia atlantica sp. nov. is proposed, with the type strain 22II14-10F7T (=CGMCC1.12470T =LMG 27421T=MCCC 1A06481T).
    INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 09/2013; · 2.11 Impact Factor
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    ABSTRACT: Bacteria closely related to Bacillus pumilus cannot be distinguished from such other species as B. safensis, B. stratosphericus, B. altitudinis and B. aerophilus simply by 16S rRNA gene sequence. In this report, 76 marine strains were subjected to phylogenetic analysis based on 7 housekeeping genes to understand the phylogeny and biogeography in comparison with other origins. A phylogenetic tree based on the 7 housekeeping genes concatenated in the order of gyrB-rpoB-pycA-pyrE-mutL-aroE-trpB was constructed and compared with trees based on the single genes. All these trees exhibited a similar topology structure with small variations. Our 79 strains were divided into 6 groups from A to F; Group A was the largest and contained 49 strains close to B. altitudinis. Additional two large groups were presented by B. safensis and B. pumilus respectively. Among the housekeeping genes, gyrB and pyrE showed comparatively better resolution power and may serve as molecular markers to distinguish these closely related strains. Furthermore, a recombinant phylogenetic tree based on the gyrB gene and containing 73 terrestrial and our isolates was constructed to detect the relationship between marine and other sources. The tree clearly showed that the bacteria of marine origin were clustered together in all the large groups. In contrast, the cluster belonging to B. safensis was mainly composed of bacteria of terrestrial origin. Interestingly, nearly all the marine isolates were at the top of the tree, indicating the possibility of the recent divergence of this bacterial group in marine environments. We conclude that B. altitudinis bacteria are the most widely spread of the B. pumilus group in marine environments. In summary, this report provides the first evidence regarding the systematic evolution of this bacterial group, and knowledge of their phylogenetic diversity will help in the understanding of their ecological role and distribution in marine environments.
    PLoS ONE 01/2013; 8(11):e80097. · 3.53 Impact Factor
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    ABSTRACT: An aerobic, Gram-staining-negative, motile, rod-shaped bacterium, strain NH52F(T), was isolated from a sandy sediment sample taken from the South China Sea. On M2 agar medium (a complex medium), colonies were beige in colour. The isolate showed highest 16S rRNA gene sequence similarities to members of the genera Leisingera (96.7 % similarity), Phaeobacter (95.4-96.0 %) and Marinovum (94.1 %). Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain NH52F(T) formed a distinct cluster with Leisingera methylohalidivorans MB2(T) and Leisingera aquimarina LMG 24366(T). Optimal growth was observed at pH 7.0-8.5 and 25 degrees C and the new isolate required the presence of 1-4 % (w/v) NaCl. The major fatty acids were C(18 : 1)omega7c, C(16 : 0) 2-OH, C(10 : 0) 3-OH, C(12 : 0) 3-OH, C(16 : 0) and 11-methyl C(18 : 1)omega7c. The DNA G+C content was 60.5 mol%. The phylogenetic and chemotaxonomic characteristics of strain NH52F(T) were similar to those of the genus Leisingera. However, the differences in phenotypic properties and the 16S rRNA gene similarity values demonstrated that the new isolate differed from recognized species of the genus Leisingera. On the basis of phenotypic, chemotaxonomic and phylogenetic data, this organism should be classified as a representative of a novel species in the genus Leisingera, for which the name Leisingera nanhaiensis sp. nov. is proposed. The type strain is NH52F(T) (=LMG 24841(T)=CCTCC AB 208316(T)=MCCC 1A04178(T)).
    International journal of systematic and evolutionary microbiology 09/2009; 60(Pt 2):275-80. · 2.11 Impact Factor
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    ABSTRACT: An aerobic, Gram-staining-negative, rod or ovoid-shaped bacterial isolate, strain NH52J(T), was isolated from a sandy sediment sample from the South China Sea. Strain NH52J(T) exhibited tumbling motility, formed beige or faint pink colonies, gave a positive reaction in tests for catalase and oxidase and required NaCl for growth. Optimal growth was observed at pH 7.8-9.3, at 30 degrees C and in the presence of 2.0-4.0 % (w/v) NaCl. The novel strain did not synthesize bacteriochlorophyll a, and the DNA G+C content was 62 %. The major fatty acids were C(18 : 1)omega7c, C(16 : 0) and C(18 : 1)omega7c 11-methyl. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain NH52J(T) was affiliated to the genus Roseovarius of the class Alphaproteobacteria. Roseovarius pacificus and Roseovarius aestuarii were the most closely related recognized species to strain NH52J(T) with 16S rRNA gene sequence similarity values of 95.0 and 95.7 %, respectively. Sequence similarity values between strain NH52J(T) and other phylogenetically related species were all below 95.0 %. Based on the phenotypic, chemotaxonomic and phylogenetic data presented, strain NH52J(T) is considered to represent a novel species of the genus Roseovarius, for which the name Roseovarius nanhaiticus sp. nov. is proposed. The type strain is NH52J(T) (=LMG 24840(T)=CCTCC AB 208317(T)=MCCC 1A03543(T)).
    International journal of systematic and evolutionary microbiology 09/2009; 60(Pt 6):1289-95. · 2.11 Impact Factor
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    ABSTRACT: A Gram-staining-negative, rod-shaped marine bacterium, designated strain NH57N(T), isolated from sandy sediment in the Mischief Reef of the South China Sea, was characterized based on its physiological and biochemical features, fatty acid profile and phylogenetic position. 16S rRNA gene sequence analysis revealed a clear affiliation with the family Flavobacteriaceae. Strain NH57N(T) showed the closest phylogenetic relationship with members of the genera Gaetbulibacter, Gelidibacter, Subsaxibacter, Subsaximicrobium and Yeosuana; levels of 16S rRNA gene sequence similarity between strain NH57N(T) and the type strains of related species ranged from 94.9 to 91.2 %. Cells of strain NH57N(T) were motile by gliding and grew on solid media as yellow colonies at 9-37 degrees C, pH 6.5-8.5 and in the presence of 0.5-4.0 % NaCl. The DNA G+C content was 32.7 mol% and the predominant fatty acids were iso-C(15 : 1) (22.7 % of the total), iso-C(15 : 0) (20.7 %), iso-C(17 : 0) 3-OH (9.5 %), iso-C(16 : 0) 3-OH (8.3 %), C(15 : 0) (7.8 %) and iso-C(15 : 0) 3-OH (5.8 %). Based on the physiological and phylogenetic data, and on the fatty acid composition, strain NH57N(T) is considered to represent a novel species of a new genus in the family Flavobacteriaceae, for which the name Meridianimaribacter flavus gen. nov., sp. nov. is proposed. The type strain of Meridianimaribacter flavus is NH57N(T) (=CCTCC AB 208318(T)=LMG 24839(T)=MCCC 1A03544(T)).
    International journal of systematic and evolutionary microbiology 08/2009; 60(Pt 1):121-7. · 2.11 Impact Factor
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    ABSTRACT: An aerobic, Gram-stain-negative, rod-shaped bacterial isolate, strain NH36A(T), was isolated from a sandy sediment sample from the South China Sea. Colonies of the isolate were dark orange on M2 agar. Optimal growth was observed at pH 7.0-8.5, 30 degrees C and in the presence of 0.5-4.0 % (w/v) NaCl. The major fatty acids were C(15 : 0), iso-C(15 : 0), anteiso-C(15 : 0), iso-C(15 : 1), iso-C(15 : 0) 3-OH, iso-C(17 : 0) 3-OH and summed feature 3 (comprising iso-C(15 : 0) 2-OH and/or C(16 : 1)omega7c). The DNA G+C content was 38.9 mol%. 16S rRNA gene sequence analysis revealed that strain NH36A(T) was most closely related to members of the genus Arenibacter, exhibiting 94.3-96.2 % sequence similarity to the type strains of Arenibacter species. On the basis of phenotypic, chemotaxonomic and phylogenetic data, this organism should be classified as a representative of a novel species in the genus Arenibacter. The name Arenibacter nanhaiticus sp. nov. is proposed and the type strain is NH36A(T) (=LMG 24842(T)=CCTCC AB 208315(T)=MCCC 1A04137(T)).
    International journal of systematic and evolutionary microbiology 08/2009; 60(Pt 1):78-83. · 2.11 Impact Factor
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    ABSTRACT: A taxonomic study was carried out on a Gram-negative, rod-shaped, non-motile, halophilic bacterium, designated strain W11-2B(T), which was isolated from a pyrene-degrading consortium that was enriched from sediment from the Pacific Ocean. Growth was observed at salinities of 0.5-10 % and at temperatures of 10-41 degrees C. Strain W11-2B(T) was unable to degrade Tween 80 or gelatin. 16S rRNA gene sequence comparisons showed that strain W11-2B(T) was related most closely to Oceanicola nanhaiensis SS011B1-20(T) (95.8 % similarity) and Oceanicola batsensis HTCC2597(T) (95.7 %); levels of 16S rRNA gene sequence similarity between strain W11-2B(T) and the type strains of other species tested were below 95.2 %. The dominant fatty acids of strain W11-2B(T) were C(18 : 1)omega7c (32.1 % of the total), C(19 : 0) cyclo (20.9 %), C(18 : 1)omega7c 11-methyl (19.5 %), C(18 : 0) (7.3 %), C(17 : 0) (6.6 %) and C(16 : 0) (3.8 %). The G+C content of the chromosomal DNA was 64.6 mol%. The above data were in good agreement with those of members of the genus Oceanicola. Based on morphology, physiology, fatty acid composition and 16S rRNA gene sequence data, strain W11-2B(T) is considered to represent a novel species of the genus Oceanicola, for which the name Oceanicola pacificus sp. nov. is proposed. The type strain is W11-2B(T) (=CCTCC AB 208224(T)=LMG 24619(T)=MCCC 1A01034(T)).
    International journal of systematic and evolutionary microbiology 06/2009; 59(Pt 5):1158-61. · 2.11 Impact Factor
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    ABSTRACT: To isolate bacteria from Nansha area of South China sea, Sediment samples of 22 sites were used. Bacterial isolation was conducted on plates of marine medium, followed by 16S rRNA identification and phylogenetic analysis. In total 349 bacteria were obtained, belonging to 87 species. Analyses of 16S rRNA sequence showed that Bacillus and other spore-forming bacteria occupied the majority of isolates in 10 sites. Bacillus was the most abundant bacterium and of high diversity; with 34 species and 8 possible novel species. Halobacillus also occurred frequently while other spore-forming bacteria including Brevibacillus, Paenibacillus, Pontibacillus and Thalassobacillus were also found, but less occurred in this area. In addition to these low-G+C-content bacteria, gamma-Proteobacteria were the second subgroup of high occurrence, among which Pseudomonas, Marinobacter and Alcanivorax were relatively abundant. Generally, isolates of 750-2000 m deep mainly consist of low-G+C-content bacteria, while mainly composed of gamma-Proteobacteria when the depth is over 2000 m. Marine sediments of South China Sea are rich in spore-forming bacteria, which deserve further study and exploitation.
    ACTA MICROBIOLOGICA SINICA 01/2009; 48(12):1578-87.