scholarly journals Loktanella agnita sp. nov. and Loktanella rosea sp. nov., from the north-west Pacific Ocean

2005 ◽  
Vol 55 (5) ◽  
pp. 2203-2207 ◽  
Author(s):  
Elena P. Ivanova ◽  
Natalia V. Zhukova ◽  
Anatoly M. Lysenko ◽  
Nataliya M. Gorshkova ◽  
Alexander F. Sergeev ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Sea Water ◽  
Sequence Similarity ◽  
Carbon Sources ◽  
Tween 80 ◽  
Rrna Gene ◽  
North West ◽  
Temperature Range ◽  
West Pacific Ocean ◽  
The North

One whitish and four pinkish strains of Gram-negative, non-motile, aerobic bacteria were isolated from sea-water and sediment samples collected in Chazhma Bay (Sea of Japan, Pacific Ocean). Analysis of 16S rRNA gene sequences revealed that these strains belonged to the ‘Alphaproteobacteria’, having highest sequence similarity of about 94–97 % with species of the genus Loktanella. None of the strains degraded gelatin, casein, chitin, agar, DNA or starch and they had limited ability to utilize carbon sources. The four pinkish strains, Fg36T, Fg1, Fg116 and Fg117, degraded Tween 80. Sea-water strain R10SW5T grew at 3–6 % NaCl and a temperature range of 8–35 °C, whilst strains Fg36T, Fg1, Fg116 and Fg117 grew at NaCl concentrations of 1–12 % and a temperature range of 4–35 °C. Phosphatidylglycerol (58/79 %), diphosphatidylglycerol (11/6 %) and phosphatidylcholine (28/22 %) were the major phospholipids. The predominant fatty acids were 16 : 0 (12·2/8·6 %) and 18 : 1ω7 (76·6/68·4 %). The DNA G+C content of strain R10SW5T was 59·1 mol% and those of the four pinkish strains ranged from 60·5 to 61·8 mol%. Based on the results of phenotypic, genotypic, chemotaxonomic and phylogenetic investigation, two novel species, Loktanella agnita sp. nov. and Loktanella rosea sp. nov., are proposed. The type strains are R10SW5T (=KMM 3788T=CIP 107883T) and Fg36T (=KMM 6003T=CIP 107851T=LMG 22534T), respectively.

scholarly journals ON SOUND SCATTERING IN THE UPPER LAYER AND ON THE SHELF OF THE NORTH-WEST PACIFIC OCEAN

2020 ◽  
Author(s):  
В.А. Буланов ◽  
И.В. Корсков ◽  
А.В. Стороженко
Keyword(s):  
Pacific Ocean ◽  
Marine Environment ◽  
Sea Water ◽  
Peter The Great Bay ◽  
Sound Scattering ◽  
West Pacific ◽  
North West ◽  
Scattering Coefficients ◽  
West Pacific Ocean ◽  
The North

Представлены результаты исследований рассеяния звука в верхнем слое морской воды в северо-западной части Тихого океана. Измерения коэффициентов рассеяния звука проводились на различных частотах от 12 до 100 кГц на шельфе и в открытом океане. Исследования представляли интерес в связи с возможностью оперативно в процессе движения судна проводить мониторинг изменчивости структуры морской среды. Проведение долговременных исследований рассеяния звука на планктоне и других микронеоднородностях морской среды в бухте Витязь залива Петра Великого Японского моря с применением акустических донных систем позволило определить вариации рассеяния звука, связанного с наличием пузырьков и суточных вариаций планктона в толще моря. Показаны возможности и проведены оценки биомассы вдоль длинных трасс в различных морях северо-западной части Тихого океана на основе рассеяния звука. The results of studies of sound scattering in the upper layer of sea water in the North-Western Pacific Ocean are presented. Sound scattering coefficients were measured at various frequencies from 12 to 100 kHz on the shelf and in the open ocean. The research was of interest because it was possible to monitor the variability of the marine environment structure quickly during the ship’s movement. Long-term studies of sound scattering on plankton and other micro-heterogeneities of the marine environment in Vityaz Bay, Peter the Great Bay, Sea of Japan, using acoustic bottom systems, allowed us to determine variations in sound scattering associated with the presence of bubbles and diurnal variations of plankton in the sea column. The possibilities of biomass along long trails in various seas of the North-West Pacific Ocean based on sound scattering are shown and estimated.

scholarly journals Corrigendum to

2021 ◽  
pp. 105644
Author(s):  
Ravi Shankar Pandey ◽  
Yuei-An Liou
Keyword(s):  
Pacific Ocean ◽  
Tropical Storm ◽  
Storm Tracks ◽  
West Pacific ◽  
North West ◽  
Atmospheric Research ◽  
West Pacific Ocean ◽  
The North

scholarly journals Kordia algicida gen. nov., sp. nov., an algicidal bacterium isolated from red tide

2004 ◽  
Vol 54 (3) ◽  
pp. 675-680 ◽  
Author(s):  
Jae Hak Sohn ◽  
Jung-Hyun Lee ◽  
Hana Yi ◽  
Jongsik Chun ◽  
Kyung Sook Bae ◽  
...  
Keyword(s):  
Sea Water ◽  
Sequence Similarity ◽  
Red Tide ◽  
Carbon Sources ◽  
Rrna Gene ◽  
Strictly Aerobic ◽  
Phenotypic Characters ◽  
Algicidal Bacterium ◽  
Rdna Sequences ◽  
The Family

A bacterium (named OT-1T) that showed algicidal activity was isolated from sea water of Masan Bay, Korea, during an outbreak of red tide. Phylogenetic analysis based on 16S rDNA sequences showed that the isolate formed a distinct phyletic lineage within the family Flavobacteriaceae of the Cytophaga–Flavobacterium–Bacteroides group. No species with a validly published name showed ⩾93 % 16S rRNA gene sequence similarity to strain OT-1T. The isolate had major amounts of iso-branched and 3-hydroxy iso-branched fatty acids and menaquinone 6 and a DNA G+C content of 34 mol%; these chemotaxonomic characters also supported the placement of the organism in the family Flavobacteriaceae. The strain was Gram-negative, yellow-pigmented, non-motile, non-gliding, flexirubin-negative, strictly aerobic, catalase-negative, oxidase-positive and halophilic. Na+, Ca2+ and Mg2+ ions were obligately required for growth. The strain utilized various sugars as sole carbon sources and degraded gelatin, skimmed milk and starch. Several phenotypic characters can be used to differentiate the test strain from phylogenetically related marine bacterial genera. On the basis of polyphasic evidence, it is proposed that strain OT-1T should be assigned to the family Flavobacteriaceae as Kordia algicida gen. nov., sp. nov. The type strain is OT-1T (=KCTC 8814PT=NBRC 1000336T).

scholarly journals Hoeflea phototrophica sp. nov., a novel marine aerobic alphaproteobacterium that forms bacteriochlorophyll a

2006 ◽  
Vol 56 (4) ◽  
pp. 821-826 ◽  
Author(s):  
Hanno Biebl ◽  
Brian J. Tindall ◽  
Rüdiger Pukall ◽  
Heinrich Lünsdorf ◽  
Martin Allgaier ◽  
...  
Keyword(s):  
Sea Water ◽  
Sequence Data ◽  
Sequence Similarity ◽  
Photosynthetic Pigment ◽  
Carbon Sources ◽  
Rrna Gene ◽  
Good Growth ◽  
Reaction Centre ◽  
The Novel ◽  
Poor Growth

Within a collection of marine strains that were shown to contain the photosynthesis reaction-centre genes pufL and pufM, a novel group of alphaproteobacteria was found and was characterized phenotypically. The 16S rRNA gene sequence data suggested that the strains belonged to the order Rhizobiales and were closest (98·5 % sequence similarity) to the recently described species Hoeflea marina. The cells contained bacteriochlorophyll a and a carotenoid, presumably spheroidenone, in small to medium amounts. Cells of the novel strains were small rods and were motile by means of single polarly inserted flagella. Good growth occurred in complex media with 0·5–7·0 % sea salts, at 25–33 °C (optimum, 31 °C) and at pH values in the range 6–9. With the exception of acetate and malate, organic carbon sources tested supported poor growth or no growth at all. Growth factors were required; these were provided by small amounts of yeast extract, but not by standard vitamin solutions. Growth occurred under aerobic to microaerobic conditions, but not under anaerobic conditions, either in the dark or light. Nitrate was not reduced. Photosynthetic pigments were formed at low to medium salt concentrations, but not at the salt concentration of sea water (3·5 %). On the basis of smaller cell size, different substrate utilization profile and photosynthetic pigment content, the novel strains can be classified as representatives of a second species of Hoeflea, for which the name Hoeflea phototrophica sp. nov. is proposed. The type strain of Hoeflea phototrophica sp. nov. is DFL-43T (=DSM 17068T=NCIMB 14078T).

scholarly journals Photic zone changes in the North West Pacific Ocean from MIS 4-5e

2014 ◽  
Vol 10 (4) ◽  
pp. 3631-3660
Author(s):  
G. E. A. Swann ◽  
A. M. Snelling
Keyword(s):  
Pacific Ocean ◽  
North Pacific Ocean ◽  
Nutrient Supply ◽  
Photic Zone ◽  
North West ◽  
West Pacific Ocean ◽  
The North ◽  
Nutrient Utilisation ◽  
Marine System ◽  
Mis 5E

Abstract. In comparison to other sectors of the marine system, the palaeoceanography of the subarctic North Pacific Ocean is poorly constrained. New diatom isotope records of δ13C, δ18O, δ30Si (δ13Cdiatom, δ18Odiatom, δ30Sidiatom), are presented alongside existing geochemical and isotope records to document changes in photic zone conditions, including nutrient supply and the efficiency of the soft-tissue biological pump, between Marine Isotope Stage (MIS) 4 and MIS 5e. Peaks in opal productivity in MIS 5b/c and MIS 5e are both associated with the breakdown of the regional halocline stratification and increased nutrient supply to the photic zone. Whereas the MIS 5e peak is associated with low rates of nutrient utilisation, the MIS 5b/c peak is associated with significantly higher rates of nutrient utilisation. Both peaks, together with other smaller increases in productivity in MIS 4 and 5a culminate with a~significant increase in freshwater input which strengthens/re-establishes the halocline and limits further upwelling of sub-surface waters to the photic zone. Whilst δ30Sidiatom and previously published records of diatom δ15N (δ15Ndiatom) (Brunelle et al., 2007, 2010) show similar trends until the latter half of MIS 5a, the records become anti-correlated after this juncture and into MIS 4, suggesting a possible change in photic zone state such as may occur with a shift to iron or silicon limitation.

scholarly journals Comparative analysis of TEC disturbances above regions of tropical cyclones in the north-west Pacific Ocean

10.12737/6594 ◽  
2015 ◽  
Vol 1 (1) ◽  
pp. 63-74
Author(s):  
Анна Полякова ◽  
Anna Polyakova ◽  
Наталья Перевалова ◽  
Natalia Perevalova
Keyword(s):  
Pacific Ocean ◽  
Tropical Cyclones ◽  
Electron Content ◽  
Total Electron ◽  
West Pacific ◽  
Ionospheric Response ◽  
North West ◽  
West Pacific Ocean ◽  
The North ◽  
Typhoon Intensity

We studied ionospheric total electron content (TEC) disturbances associated with tropical cyclones (TCs). The study was based on the statistical analysis of six cyclones with different intensity which occurred in the North-West Pacific Ocean in September–November 2005. We used TEC data from the international network of two-frequency ground-based GPS receivers and NCEP/NCAR Reanalysis meteorological archive. TEC variations of different period ranges (2–20 and 20–60 min) are shown to be more intense during TC peaks under quiet geomagnetic conditions. The highest TEC variation amplitudes are registered when the wind speed in the cyclone and the TC area are maximum. The intensification of TEC disturbances is more pronounced when several cyclones occur simulta-neously. We found that the ionospheric response to TC can be observed only after the cyclone has reached typhoon intensity. The ionospheric response is more pronounced at low satellite elevation angles.

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