scholarly journals The first report and biological characteristics of Helcococcus ovis isolated from clinical bovine mastitis in a Chinese dairy herd

2021 ◽  
Author(s):  
Kai Liu ◽  
Zhaoju Deng ◽  
Limei Zhang ◽  
Xiaolong Gu ◽  
Gang Liu ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Bovine Mastitis ◽  
Infection Model ◽  
Growth Speed ◽  
Rrna Gene ◽  
Biochemical Tests ◽  
Diagnostic Laboratory ◽  
Milk Samples ◽  
Isolation And Characterization

Helcococcus ovis (H. ovis) was first reported in ovine subclinical mastitis milk and post-mortem examinated organs in Spain and the United Kingdom in 1999, subsequently, it appeared in cattle, horse, goat, and human. However, isolation and characterization of the strain in clinical bovine mastitis is unknown. Therefore, our objective was to identify the pathogen in clinical bovine mastitis. A total of 4 strains from 34 bovine mastitis milk samples were identified, there are tiny and transparent colonies from clinical bovine mastitis milk samples in a Chinese dairy farm, however, these colonies could not be identified using on-farm biochemical tests. The isolates were transported to Mastitis Diagnostic Laboratory of China Agricultural University in Beijing. The colonies were identified as a mixture of H. ovis and Arcanobacterium pyogenes according to microscopic examination and 16S rRNA gene sequencing and  the phylogenetic tree was constructed using 16S rRNA gene sequence of H. ovis isolates. In addition, the growth curve and biochemistry test were performed, we also examined the antimicrobial resistance profiles and constructed murine mammary infection model. Our results showed that the H. ovis were closely related to the strains isolated from China and Japan, growth speed of H. ovis was relatively slower than Strep.agalactiae, the phenotypic characteristics were similar to CCUG37441 and CCUG39041 except to lactose, isolates were sensitive to most of antimicrobials except daptomycin, H. ovis could lead to murine mastitis. In this report, we firstly described the characteristics of H. ovis that are associated with clinical bovine mastitis in China.

scholarly journals Molecular characterization of Nocardiopsis species from Didwana dry salt lake of Rajasthan, India

2021 ◽  
Vol 13 (1) ◽  
pp. 396-401
Author(s):  
Khushbu Parihar ◽  
Alkesh Tak ◽  
Praveen Gehlot ◽  
Rakesh Pathak ◽  
Sunil Kumar Singh
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Bioactive Compounds ◽  
Salt Lake ◽  
Bioactive Compound ◽  
Rrna Gene ◽  
Biochemical Tests ◽  
Multiple Sequence ◽  
Isolation And Characterization

The genus Nocardiopsis is well known to produce secondary metabolites especially antibacterial bioactive compound. Isolation and characterization of bioactive compounds producing novel isolates from unusual habitats are crucial. The present study was aimed to explore Didwana dry salt lake of Rajasthan state in India for the isolation and characterization of actinomycetes. The isolated actinomycetes isolates were characterized based on culture characteristics, biochemical tests and 16S rRNA gene sequencing. The 16S rRNA gene sequence analysis revealed that all the five isolates inhabiting soil of the said dry salt lake of Didwana, Rajasthan belonged to four species of Nocardiopsis viz., N. synnemataformans, N. potens, N. prasina and N. dassonvillei subsp. albirubida. The molecular identification based on 16S rRNA gene sequences was found accurate and robust. The phylogram generated through multiple sequence alignment of all the test isolates of Nocardiopsis revealed that the isolates aroused from a single branch and validated monophyletic association. The present study is the first report of exploring Nocardiopsis isolates from the dry salt lake. These characterized Nocardiopsis isolates isolated from Didwana dry salt lake habitat are novel stains and can be of significance in the detection and utilization of novel bioactive compounds.

scholarly journals Microbial assessment of milk collected from different markets of Mymensingh, Gazipur and Sherpur districts of Bangladesh and determination of antimicrobial resistance patterns of the isolated bacteria

2017 ◽  
Vol 1 (1) ◽  
pp. 7-16
Author(s):  
Mohammad Farhad Hossain ◽  
Md Tanvir Rahman ◽  
SM Lutful Kabir
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Bacterial Load ◽  
Microbiological Quality ◽  
Rrna Gene ◽  
Biochemical Tests ◽  
Selective Media ◽  
E Coli ◽  
Milk Samples ◽  
Unpasteurized Milk

The study was conducted to determine the total viable count (TVC) and total coliform count (TCC) of unpasteurized, pasteurized and UHT milk samples to assess their microbiological quality. A total of 60 milk samples were collected from different markets of Mymensingh, Gazipur and Sherpur districts. The TVC of milk was performed to determine the bacterial load in supplied milk samples and TCC to determine the coliform bacterial load in collected milk samples. Milk samples were cultured onto various selective media for the isolation of bacteria. The isolated bacteria were identified by cultural properties on different selective media, biochemical tests and finally by PCR. Out of 60 samples 20 unpasteurized milk samples from different markets were found positive for Staphylococcus aureus and 19 unpasteurized milk samples were found positive for Escherichia coli. All the S. aureus were found positive for S. aureus specific 16S rRNA gene by PCR. Out of 19 isolates of E. coli, 15 were found positive for E. coli 16S rRNA gene by PCR. Results of antimicrobial susceptibility test showed that most of the isolates of S. aureus and E .coli were susceptible to azithromycin, streptomycin, gentamicin, norfloxacin, tetracycline and ciprofloxacin but resistant to amoxicillin and erythromycin. The findings of this study revealed the presence of multidrug resistant S. aureus and E. coli in unpasteurized milk samples that posseses a serious threat to public health. Asian Australas. J. Food Saf. Secur. 2017, 1 (1), 7-16

scholarly journals Nocardioides panacihumi sp. nov., isolated from soil of a ginseng field

2007 ◽  
Vol 57 (9) ◽  
pp. 2143-2146 ◽  
Author(s):  
Dong-Shan An ◽  
Wan-Taek Im ◽  
Sung-Taik Lee ◽  
Min-Ho Yoon
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Major Fatty Acid ◽  
Rrna Gene ◽  
Strictly Aerobic ◽  
Biochemical Tests ◽  
Phenotypic Differentiation ◽  
The Family ◽  
Established Species ◽  
Type Strains

A novel bacterial strain designated Gsoil 616T was isolated from a soil sample of a ginseng field in Pocheon province (South Korea) and was characterized taxonomically by using a polyphasic approach. The isolate was Gram-positive, strictly aerobic, non-motile, non-spore-forming and rod- or coccoid-shaped. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate belongs to the genus Nocardioides in the family Nocardioidaceae but was clearly separated from established species of this genus. The 16S rRNA gene sequence similarities between strain Gsoil 616T and the type strains of Nocardioides species with validly published names ranged from 91.8 to 96.1 %. The G+C content of the genomic DNA was 73 mol%. Phenotypic and chemotaxonomic data [major menaquinone MK-8(H4) and major fatty acid iso-C16 : 0] supported the affiliation of strain Gsoil 616T to the genus Nocardioides. However, the results of physiological and biochemical tests allowed phenotypic differentiation of the isolate from other Nocardioides species. Therefore, strain Gsoil 616T represented a novel species within the genus Nocardioides, for which the name Nocardioides panacihumi sp. nov. is proposed. The type strain is Gsoil 616T (=KCTC 19187T =DSM 18660T).

scholarly journals Halalkalicoccus jeotgali sp. nov., a halophilic archaeon from shrimp jeotgal, a traditional Korean fermented seafood

2007 ◽  
Vol 57 (10) ◽  
pp. 2296-2298 ◽  
Author(s):  
Seong Woon Roh ◽  
Young-Do Nam ◽  
Ho-Won Chang ◽  
Youlboong Sung ◽  
Kyoung-Ho Kim ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Type Strain ◽  
Rrna Gene ◽  
Halophilic Archaeon ◽  
Gene Sequences ◽  
16S Rrna Gene Sequences ◽  
Biochemical Tests ◽  
Extremely Halophilic Archaeon ◽  
Physiological And Biochemical

A novel, extremely halophilic archaeon B3T was isolated from shrimp-salted seafood. Its morphology, physiology, biochemical features and 16S rRNA gene sequence were characterized. Strain B3T is non-motile, Gram-variable, requires at least 10 % (w/v) NaCl for growth and grows in the ranges of 21–50 °C and pH 6.5–9.0. The DNA G+C content of strain B3T was 63.2 mol%. Phylogenetic analysis based on the 16S rRNA gene sequences indicated that strain B3T belonged to the genus Halalkalicoccus and was phylogenetically closely related to the type strain Halalkalicoccus tibetensis (98.64 %). However, DNA–DNA hybridization experiments showed 7.0 % relatedness between strain B3T and a strain of a reference species of the genus Halalkalicoccus. Combined analysis of 16S rRNA gene sequences, DNA–DNA relatedness data, physiological and biochemical tests indicated that the genotypic and phenotypic characteristics differentiate strain B3T from other Halalkalicoccus species. On the basis of the evidence presented in this report, strain B3T represents a novel species of the genus Halalkalicoccus, for which the name Halalkalicoccus jeotgali. sp. nov. is proposed. The type strain is B3T (=KCTC 4019T=DSM 18796T=JCM 14584T=CECT 7217T).

Thauera humireducens sp. nov., a humus-reducing bacterium isolated from a microbial fuel cell

2013 ◽  
Vol 63 (Pt_3) ◽  
pp. 873-878 ◽  
Author(s):  
Gui-Qin Yang ◽  
Jun Zhang ◽  
Soon-Wo Kwon ◽  
Shun-Gui Zhou ◽  
Lu-Chao Han ◽  
...  
Keyword(s):  
Fuel Cell ◽  
16S Rrna ◽  
16S Rrna Gene ◽  
Microbial Fuel Cell ◽  
Type Species ◽  
Sequence Similarity ◽  
Rrna Gene ◽  
Biochemical Tests ◽  
Content Type ◽  
Link Type

A Gram-negative, rod-shaped, non-spore-forming bacterium, designated SgZ-1T, was isolated from the anode biofilm of a microbial fuel cell. The strain had the ability to grow under anaerobic condition via the oxidation of various organic compounds coupled to the reduction of anthraquione-2,6-disulfonate (AQDS) to anthrahydroquinone-2,6-disulfonate (AHQDS). Growth occurred in TSB in the presence of 0–5.5 % (w/v) NaCl (optimum 0–1 %), at 10–45 °C (optimum 25–37 °C) and at pH 6.0–10.0 (optimum 8.0–8.5). Based on 16S rRNA gene sequence similarity, strain SgZ-1T belonged to the genus Thauera . The highest level of 16S rRNA gene sequences similarity (96.7 %) was found to be with Thauera aminoaromatica S2 T and Thauera selenatis AXT, and lower values were obtained when compared with other recognized Thauera species. Chemotaxonomic analysis revealed that strain SgZ-1T contained Q-8 as the predominant quinone, and putrescine and 2-hydroxyputrescine as the major polyamines. The major cellular fatty acids (>5 %) were C16 : 1ω6c and/or C16 : 1ω7c (44.6 %), C16 : 0 (18.8 %), and C18 : 1ω6c and/or C18 : 1ω7c (12.7 %). Based on its phenotypic and phylogenetic properties, chemotaxonomic analysis and the results of physiological and biochemical tests, strain SgZ-1T ( = KACC 16524T = CCTCC M 2011497T) was designated the type strain of a novel species of the genus Thauera , for which the name Thauera humireducens sp. nov. was proposed.

scholarly journals Identification of microbiome with 16S rRNA gene pyrosequencing and antimicrobial effect of egg white in bovine mastitis

2017 ◽  
Vol 57 (2) ◽  
pp. 117-126
Author(s):  
Danil Kim ◽  
Eun-Kyung Kim ◽  
Won-Jin Seong ◽  
Younghye Ro ◽  
Dae-Sung Ko ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Bovine Mastitis ◽  
Antimicrobial Effect ◽  
Egg White ◽  
Rrna Gene ◽  
16S Rrna Gene Pyrosequencing

scholarly journals Flavisolibacter ginsengiterrae gen. nov., sp. nov. and Flavisolibacter ginsengisoli sp. nov., isolated from ginseng cultivating soil

2007 ◽  
Vol 57 (8) ◽  
pp. 1834-1839 ◽  
Author(s):  
Min-Ho Yoon ◽  
Wan-Taek Im
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Type Strain ◽  
Gene Sequence ◽  
Sequence Similarity ◽  
16S Rrna Gene Sequence ◽  
Rrna Gene ◽  
Rrna Gene Sequence ◽  
Biochemical Tests ◽  
Separate Species

Two strains (Gsoil 492T and Gsoil 643T) isolated in Pocheon Province, South Korea, from soil used for ginseng cultivation were characterized using a polyphasic approach. Both isolates comprised Gram-negative, aerobic, non-motile, rod-shaped bacteria. They had similar chemotaxonomic characteristics, e.g. containing MK-7 as the major quinone, having a DNA G+C content in the range 42.5–43.3 mol% and possessing iso-C15 : 0 and iso-C17 : 0 3-OH as the major fatty acids. A phylogenetic analysis based on 16S rRNA gene sequences indicated that the two isolates formed a tight cluster with several uncultured bacterial clones and with the established genera Terrimonas, Niastella and Chitinophaga in the phylum Bacteroidetes but were clearly separate from these genera. The levels of 16S rRNA gene sequence similarity between the isolates and type strains of related genera ranged from 87.5 to 92.4 %. Furthermore, the results of physiological and biochemical tests allowed phenotypic differentiation of the isolates from phylogenetically closely related species with validly published names. The level of 16S rRNA gene sequence similarity between the two strains was 99.5 %, whereas the DNA–DNA relatedness value was 44 %, indicating that they represent separate species. On the basis of the polyphasic evidence, a novel genus, Flavisolibacter gen. nov., and two novel species, Flavisolibacter ginsengiterrae sp. nov. (type strain Gsoil 492T=KCTC 12656T=DSM 18136T) and Flavisolibacter ginsengisoli sp. nov. (type strain Gsoil 643T=KCTC 12657T=DSM 18119T), are proposed. Flavisolibacter ginsengiterrae is the type species of the genus.

Arcanobacterium phocisimile sp. nov., isolated from harbour seals

2013 ◽  
Vol 63 (Pt_6) ◽  
pp. 2019-2024 ◽  
Author(s):  
Muaz Hijazin ◽  
Osama Sammra ◽  
Hivda Ülbegi-Mohyla ◽  
Samy Nagib ◽  
Jörg Alber ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Type Species ◽  
Sequence Similarity ◽  
Rrna Gene ◽  
Biochemical Tests ◽  
Unidentified Phospholipid ◽  
Content Type ◽  
Link Type ◽  
Harbour Seals

A polyphasic taxonomic study was performed on two previously unidentified Arcanobacterium -like Gram-positive strains isolated from harbour seals. Comparative 16S rRNA gene sequencing showed that both bacteria belonged to the genus Arcanobacterium and were most closely related to Arcanobacterium haemolyticum CIP 103370T (98.4 % 16S rRNA gene sequence similarity), A. canis P6775T (97.4 %), A. phocae DSM 10002T (97.4 %), A. pluranimalium M430/94/2T (95.7 %) and A. hippocoleae CCUG 44697T (95.5 %). The presence of the major menaquinone MK-9(H4) supported the affiliation of the isolates with the genus Arcanobacterium . The polar lipid profile consisted of major amounts of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, phosphatidylinositol mannoside, an unidentified phospholipid and two unidentified glycolipids. The major fatty acids were C16 : 0, C18 : 0, C18 : 1ω9c and summed feature 5 (comprising C18 : 2ω6,9c and/or anteiso-C18 : 0). Physiological and biochemical tests clearly distinguished the isolates from other members of the genus Arcanobacterium . Based on the common origin and various physiological properties comparable to those of A. phocae , it is proposed that the isolates are classified as members of a novel species with the name Arcanobacterium phocisimile sp. nov. The type strain is 2698T ( = LMG 27073T  = CCM 8430T).

Terrabacter terrae sp. nov., a novel actinomycete isolated from soil in Spain

2005 ◽  
Vol 55 (6) ◽  
pp. 2491-2495 ◽  
Author(s):  
Marta Montero-Barrientos ◽  
Raúl Rivas ◽  
Encarna Velázquez ◽  
Enrique Monte ◽  
Manuel G. Roig
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Gene Sequence ◽  
Sequence Similarity ◽  
16S Rrna Gene Sequence ◽  
Rrna Gene ◽  
Rrna Gene Sequence ◽  
Biochemical Tests ◽  
Bacterium Strain

A Gram-positive, aerobic, long-rod-shaped, non-spore-forming bacterium (strain PPLBT) was isolated from soil mixed with Iberian pig hair. This actinomycete showed keratinase activity in vitro when chicken feathers were added to the culture medium. Strain PPLBT was oxidase-negative and catalase-positive and produced lipase and esterase lipase. This actinomycete grew at 40 °C on nutrient agar and in the same medium containing 5 % (w/v) NaCl. Growth was observed with many different carbohydrates as the sole carbon source. On the basis of 16S rRNA gene sequence similarity, strain PPLBT was shown to belong to the genus Terrabacter of the family Intrasporangiaceae. Strain PPLBT showed 98·8 % 16S rRNA gene sequence similarity to Terrabacter tumescens. Chemotaxonomic data, such as the main ubiquinone (MK-8), the main polar lipids (phosphatidylethanolamine, diphosphatidylglycerol and phosphatidylinositol) and the main fatty acids (i-C15 : 0, ai-C15 : 0, i-C16 : 0 and ai-C17 : 0) supported the affiliation of strain PPLBT to the genus Terrabacter. The G+C content of the DNA was 71 mol%. The results of DNA–DNA hybridization (36·6 % relatedness between Terrabacter tumescens and strain PPLBT) and physiological and biochemical tests suggested that strain PPLBT belongs to a novel species of the genus Terrabacter, for which the name Terrabacter terrae sp. nov. is proposed. The type strain is PPLBT (=CECT 3379T=LMG 22921T).

scholarly journals Isolation and Characterization of a Novel Bacterium from the Marine Environment for Trichloroacetic Acid Bioremediation

2020 ◽  
Vol 10 (13) ◽  
pp. 4593 ◽  
Author(s):  
Mahshid Heidarrezaei ◽  
Hoofar Shokravi ◽  
Fahrul Huyop ◽  
Seyed Saeid Rahimian Koloor ◽  
Michal Petrů
Keyword(s):  
16S Rrna ◽  
Trichloroacetic Acid ◽  
Specific Activity ◽  
Morphological Observation ◽  
Rrna Gene ◽  
Industrial Chemicals ◽  
Halogenated Compounds ◽  
Biochemical Tests ◽  
Isolation And Characterization ◽  
Halogenated Compound

Halogenated compounds are an important class of environmental pollutants that are widely used in industrial chemicals such as solvents, herbicides, and pesticides. Many studies have been carried out to explore the biodegradation of these chemicals. Trichloroacetic acid (TCA) is one of the main halogenated compounds that are carcinogenic to humans and animals. The bacterium was isolated from the northern coastline of Johor Strait. In this study, the ability of strain MH2 to biodegrade TCA was evaluated by a growth experiment and dehalogenase enzyme assay. The growth profile of the isolated strain was examined. The doubling time for L. boronitolerans MH2 was found to be 32 h. The release of chloride ion in the degradation process was measured at 0.33 × 10−3 ± 0.03 mol∙L−1 after 96 h when the growth curve had reached its maximum within the late bacterial exponential phase. The results showed that the strain had a promising ability to degrade TCA by producing dehalogenase enzyme when cell-free extracts were prepared from growth on TCA as the sole carbon source with enzyme-specific activity, 1.1 ± 0.05 µmolCl−min−1∙mg−1 protein. Furthermore, the morphological, and biochemical aspects of the isolated bacterium were studied to identify and characterize the strain. The morphological observation of the isolated bacterium was seen to be a rod-shaped, Gram-positive, motile, heterotrophic, and spore-forming bacterium. The amplification of the 16S rRNA and gene analysis results indicated that the isolated bacterium had 98% similarity to Lysinibacillus boronitolerans. The morphological and biochemical tests supported the 16S rRNA gene amplification. To the best of the authors’ knowledge, this is the first reported case of this genus of bacteria to degrade this type of halogenated compound.

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