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[PMID]: 29524890
[Au] Autor:Xie H; Feng L; Hu Q; Zhu Y; Gao H; Gao Y; Yao X
[Ad] Address:Key Lab of Marine Environmental Science and Ecology (MoE), Ocean University of China, Qingdao 266100, China.
[Ti] Title:Concentration and size distribution of water-extracted dimethylaminium and trimethylaminium in atmospheric particles during nine campaigns - Implications for sources, phase states and formation pathways.
[So] Source:Sci Total Environ;631-632:130-141, 2018 Mar 07.
[Is] ISSN:1879-1026
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:In this study, we determined the concentrations of water-extracted dimethylaminium (DMA ) and trimethylaminium (TMA ) in size-segregated atmospheric particles collected during three inland campaigns and one sea-beach campaign in Qingdao and five marine campaigns in marginal seas of China and the northwest Pacific Ocean. The averages of DMA and TMA in PM - (the sum of concentrations from 0.056 to 10µm) during each campaign ranged from 0.045 to 1.1nmolm and from 0.029 to 0.53nmolm , respectively. The increased concentrations of DMA and TMA in PM - , particularly the 1-2 orders of magnitude increased ratios of DMA /NH and TMA /NH , in the marine and sea-beach atmospheres indicated that the overwhelming majority was derived from marine sources. Size distributions of TMA and DMA were also investigated in terms of phase states and formation pathways, e.g., the dominant modes of particulate DMA and TMA in some samples were characterized by the mass median aerodynamic diameter at 0.1-0.2µm against the dominant mode of NH and SO at 0.7-0.9µm, while the ratios of DMA /NH and/or TMA /NH in <0.2µm particles increased by 3-10 times from the corresponding lower values in >0.2µm particles. This strongly implied that the particulate DMA and TMA at <0.2µm size range overwhelmingly existed in the liquid organic phase as unprotonated TMA and DMA, but those at the >0.2µm size range mainly existed in the aqueous (or solid) phase where the dominance of gas-aerosol equilibria would cause the ratios to be almost size-independent. The size-dependent phase states corresponded to their various formation pathways.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

  2 / 8533 MEDLINE  
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[PMID]: 29515285
[Au] Autor:DiMento BP; Mason RP
[Ad] Address:University of Connecticut, Department of Marine Sciences, 1080 Shennecossett Rd, Groton, CT 06340, United States.
[Ti] Title:Factors controlling the photochemical degradation of methylmercury in coastal and oceanic waters.
[So] Source:Mar Chem;196:116-125, 2017 Nov 20.
[Is] ISSN:0304-4203
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:Many studies have recognized abiotic photochemical degradation as an important sink of methylmercury (CH Hg) in sunlit surface waters, but the rate-controlling factors remain poorly understood. The overall objective of this study was to improve our understanding of the relative importance of photochemical reactions in the degradation of CH Hg in surface waters across a variety of marine ecosystems by extending the range of water types studied. Experiments were conducted using surface water collected from coastal sites in Delaware, New Jersey, Connecticut, and Maine, as well as offshore sites on the New England continental shelf break, the equatorial Pacific, and the Arctic Ocean. Filtered water amended with additional CH Hg at environmentally relevant concentrations was allowed to equilibrate with natural ligands before being exposed to natural sunlight. Water quality parameters - salinity, dissolved organic carbon, and nitrate - were measured, and specific UV absorbance was calculated as a proxy for dissolved aromatic carbon content. Degradation rate constants (0.87-1.67 day ) varied by a factor of two across all water types tested despite varying characteristics, and did not correlate with initial CH Hg concentrations or other environmental parameters. The rate constants in terms of cumulative photon flux values were comparable to, but at the high end of, the range of values reported in other studies. Further experiments investigating the controlling parameters of the reaction observed little effect of nitrate and chloride, and potential for bromide involvement. The HydroLight radiative transfer model was used to compute solar irradiance with depth in three representative water bodies - coastal wetland, estuary, and open ocean - allowing for the determination of water column integrated rates. Methylmercury loss per year due to photodegradation was also modeled across a range of latitudes from the Arctic to the Equator in the three model water types, resulting in an estimated global demethylation rate of 25.3 Mmol yr . The loss of CH Hg was greatest in the open ocean due to increased penetration of all wavelengths, especially the UV portion of the spectrum which has a greater ability to degrade CH Hg. Overall, this study provides additional insights and information to better constrain the importance of photochemical degradation in the cycling of CH Hg in marine surface waters and its transport from coastal waters to the open ocean.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180311
[Lr] Last revision date:180311
[St] Status:In-Data-Review
[do] DOI:10.1016/j.marchem.2017.08.006

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[PMID]: 29523891
[Au] Autor:Graham ED; Heidelberg JF; Tully BJ
[Ad] Address:Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA.
[Ti] Title:Potential for primary productivity in a globally-distributed bacterial phototroph.
[So] Source:ISME J;, 2018 Mar 09.
[Is] ISSN:1751-7370
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Aerobic anoxygenic phototrophs (AAnPs) are common in marine environments and are associated with photoheterotrophic activity. To date, AAnPs that possess the potential for carbon fixation have not been identified in the surface ocean. Using the Tara Oceans metagenomic dataset, we have identified draft genomes of nine bacteria that possess the genomic potential for anoxygenic phototrophy, carbon fixation via the Calvin-Benson-Bassham cycle, and the oxidation of sulfite and thiosulfate. Forming a monophyletic clade within the Alphaproteobacteria and lacking cultured representatives, the organisms compose minor constituents of local microbial communities (0.1-1.0%), but are globally distributed, present in multiple samples from the North Pacific, Mediterranean Sea, the East Africa Coastal Province, and the Atlantic. This discovery may require re-examination of the microbial communities in the oceans to understand and constrain the role this group of organisms may play in the global carbon cycle.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher
[do] DOI:10.1038/s41396-018-0091-3

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[PMID]: 29507286
[Au] Autor:Detlef H; Belt ST; Sosdian SM; Smik L; Lear CH; Hall IR; Cabedo-Sanz P; Husum K; Kender S
[Ad] Address:School of Earth and Ocean Sciences, Cardiff University, Cardiff, CF10 3AT, UK. DetlefH1@cardiff.ac.uk.
[Ti] Title:Sea ice dynamics across the Mid-Pleistocene transition in the Bering Sea.
[So] Source:Nat Commun;9(1):941, 2018 Mar 05.
[Is] ISSN:2041-1723
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Sea ice and associated feedback mechanisms play an important role for both long- and short-term climate change. Our ability to predict future sea ice extent, however, hinges on a greater understanding of past sea ice dynamics. Here we investigate sea ice changes in the eastern Bering Sea prior to, across, and after the Mid-Pleistocene transition (MPT). The sea ice record, based on the Arctic sea ice biomarker IP and related open water proxies from the International Ocean Discovery Program Site U1343, shows a substantial increase in sea ice extent across the MPT. The occurrence of late-glacial/deglacial sea ice maxima are consistent with sea ice/land ice hysteresis and land-glacier retreat via the temperature-precipitation feedback. We also identify interactions of sea ice with phytoplankton growth and ocean circulation patterns, which have important implications for glacial North Pacific Intermediate Water formation and potentially North Pacific abyssal carbon storage.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[St] Status:In-Data-Review
[do] DOI:10.1038/s41467-018-02845-5

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[PMID]: 29458542
[Au] Autor:Sun QL; Yu C; Luan ZD; Lian C; Hu YH; Sun L
[Ad] Address:1​Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, PR China.
[Ti] Title:Description of Bacillus kexueae sp. nov. and Bacillus manusensis sp. nov., isolated from hydrothermal sediments.
[So] Source:Int J Syst Evol Microbiol;68(3):829-834, 2018 Mar.
[Is] ISSN:1466-5034
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Two Gram-staining-positive, strictly aerobic bacilli, designated as strains Ma50-5 and Ma50-6 , were isolated from the hydrothermal sediments of Manus Basin in the western Pacific Ocean. Based on 16S rRNA gene sequence, strains Ma50-5 and Ma50-6 were most closely related to Bacillus alveayuensis (97.0 and 97.2 % identity, respectively). The 16S rRNA gene sequence identity between strains Ma50-5 and Ma50-6 was 97.4 %. The identities between strains Ma50-5 and Ma50-6 and other closely related organisms were below 97.0 %. The G+C contents of the genomic DNA of strains Ma50-5 and Ma50-6 were 43.4 and 47.6 mol%, respectively. The major fatty acids (>10 %) of both strains were iso-C15 : 0 and iso-C17 : 0. The predominant isoprenoid quinone detected in both strains was menaquinone-7. Phylogenetic, physiological, biochemical and morphological analyses suggested that strains Ma50-5 and Ma50-6 represent two novel species of the genus Bacillus, for which the names Bacillus kexueae sp. nov. (type strain Ma50-5 =KCTC 33881 =CCTCC AB 2017020 ) and Bacillus manusensis sp. nov. (type strain Ma50-6 =KCTC 33882 =CCTCC AB 2017019 ), respectively, are proposed.
[Mh] MeSH terms primary: Bacillus/classification
Geologic Sediments/microbiology
Hydrothermal Vents/microbiology
Phylogeny
[Mh] MeSH terms secundary: Bacillus/genetics
Bacillus/isolation & purification
Bacterial Typing Techniques
Base Composition
DNA, Bacterial/genetics
Fatty Acids/chemistry
Nucleic Acid Hybridization
Pacific Ocean
RNA, Ribosomal, 16S/genetics
Sequence Analysis, DNA
Vitamin K 2/analogs & derivatives
Vitamin K 2/chemistry
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (DNA, Bacterial); 0 (Fatty Acids); 0 (RNA, Ribosomal, 16S); 11032-49-8 (Vitamin K 2); 8427BML8NY (vitamin MK 7)
[Em] Entry month:1803
[Cu] Class update date: 180308
[Lr] Last revision date:180308
[Js] Journal subset:IM
[Da] Date of entry for processing:180221
[St] Status:MEDLINE
[do] DOI:10.1099/ijsem.0.002594

  6 / 8533 MEDLINE  
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[PMID]: 29458485
[Au] Autor:Nedashkovskaya OI; Kim SG; Stenkova AM; Kukhlevskiy AD; Zhukova NV; Mikhailov VV
[Ad] Address:1​G.B. Elyakov Pacific Institute of Bioorganic Chemistry of the Far-Eastern Branch of the Russian Academy of Sciences, Prospekt 100 Let Vladivostoku 159, 690022, Vladivostok, Russia.
[Ti] Title:Aquimarina algiphila sp. nov., a chitin degrading bacterium isolated from the red alga Tichocarpus crinitus.
[So] Source:Int J Syst Evol Microbiol;68(3):892-898, 2018 Mar.
[Is] ISSN:1466-5034
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:A strictly aerobic, Gram-stain-negative, rod-shaped, motile by gliding and yellow-orange pigmented flavobacterium, designated strain 9Alg 151 , was isolated from the Pacific red alga Tichocarpus crinitus. Phylogenetic analysis based on 16S rRNA gene sequences showed that the novel strain fell into the genus Aquimarina of the family Flavobacteriaceae with a 16S rRNA gene sequence similarity range of 94.2-98.2 % to the recognized species of the genus. Strain 9Alg 151 grew in the presence of 0.5-5 % NaCl and at 5-34 °C, and hydrolysed aesculin, agar, gelatin, starch, Tween 40, DNA and chitin. The predominant fatty acids were iso-C17 : 0 3-OH, iso-C15 : 0, iso-C15 : 1 G, iso-C15 : 0 3-OH, iso-C16 : 0, iso-C17 : 1ω8c and summed feature 3. The polar lipid profile comprised phosphatidylethanolamine, three unidentified aminolipids and three unidentified lipids. The major respiratory quinone was MK-6. The genomic DNA G+C content was 32.6 mol%. On the basis of 16S rRNA gene sequence data, and chemotaxonomic and phenotypic characteristics, strain 9Alg 151 represents a novel species of the genus Aquimarina, for which the name Aquimarina algiphila sp. nov. is proposed. The type strain is 9Alg 151 (=KCTC 23622 =KMM 6462 ).
[Mh] MeSH terms primary: Flavobacteriaceae/classification
Phylogeny
Rhodophyta/microbiology
[Mh] MeSH terms secundary: Bacterial Typing Techniques
Base Composition
DNA, Bacterial/genetics
Fatty Acids/chemistry
Flavobacteriaceae/genetics
Flavobacteriaceae/isolation & purification
Pacific Ocean
Phosphatidylethanolamines/chemistry
Pigmentation
RNA, Ribosomal, 16S/genetics
Russia
Sequence Analysis, DNA
Vitamin K 2/analogs & derivatives
Vitamin K 2/chemistry
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (DNA, Bacterial); 0 (Fatty Acids); 0 (Phosphatidylethanolamines); 0 (RNA, Ribosomal, 16S); 11032-49-8 (Vitamin K 2); 39382-08-6 (phosphatidylethanolamine); 71ANL51TLA (menaquinone 6)
[Em] Entry month:1803
[Cu] Class update date: 180308
[Lr] Last revision date:180308
[Js] Journal subset:IM
[Da] Date of entry for processing:180221
[St] Status:MEDLINE
[do] DOI:10.1099/ijsem.0.002606

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[PMID]: 29428651
[Au] Autor:Ngo NS; Zhong N; Bao X
[Ad] Address:School of Planning, Public Policy, and Management, University of Oregon, USA. Electronic address: nngo@uoregon.edu.
[Ti] Title:The effects of transboundary air pollution following major events in China on air quality in the U.S.: Evidence from Chinese New Year and sandstorms.
[So] Source:J Environ Manage;212:169-175, 2018 Apr 15.
[Is] ISSN:1095-8630
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Transboundary air pollution is a global environmental and public health problem including in the U.S., where pollution emissions from China, the largest emitter of anthropogenic air pollution in the world, can travel across the Pacific Ocean and reach places like California and Oregon. We examine the effects of transboundary air pollution following major events in China, specifically sandstorms, a natural-occurring source of air pollution, and Chinese New Year, a major 7-day holiday, on background air quality in the U.S. We focus on high elevation sites on the west coast between 2000 and 2013. We use regression analysis and a natural experiment to exploit the variation in the timing of these events in China, which are plausibly uncorrelated to other factors that affect air quality in China and the U.S. We find that sandstorms are associated with statistically significant increases in background coarse and fine particulate matter (PM) in the U.S., representing between 16 and 39% of average weekly PM levels. We also find Chinese New Year is associated with modest reductions in background air quality in the U.S., representing between 0.4 and 2.5% of PM levels. Findings are robust to different models and falsification tests. These results suggest that regression analysis could be a powerful tool to complement other, more widely used techniques in the environmental sciences that study this problem. This also has important implications for policymakers, who could track major sandstorms in China and prepare for possible increased foreign pollution emissions in the U.S.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1802
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[St] Status:In-Process

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[PMID]: 29516521
[Au] Autor:Becerril-Garcia EE; Petatan-Ramirez D; Ortiz-Aguirre I; Ayala-Bocos A
[Ad] Address:Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, 23096, La Paz, Baja California Sur, México.
[Ti] Title:First record of the Pacific seahorse Hippocampus ingens in Guadalupe Island, Mexico.
[So] Source:J Fish Biol;, 2018 Mar 07.
[Is] ISSN:1095-8649
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:This is the first record of the Pacific seahorse Hippocampus ingens at a northern oceanic island from the eastern Pacific Ocean. The photographic record of the juvenile female H. ingens was made in November 2015 during a cage diving trip at Guadalupe Island, Mexico. The presence of H. ingens in this area could be related to long distance dispersal mechanisms, as has been observed in other species of seahorses.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180308
[Lr] Last revision date:180308
[St] Status:Publisher
[do] DOI:10.1111/jfb.13567

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[PMID]: 29363442
[Au] Autor:Matsuura H; Yokota K
[Ad] Address:Department of General Internal Medicine, Mitoyo General Hospital, Kanonji, Kagawa, Japan.
[Ti] Title:Case Report: Family Cluster of Japanese Spotted Fever.
[So] Source:Am J Trop Med Hyg;98(3):835-837, 2018 Mar.
[Is] ISSN:1476-1645
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Spotted fever group rickettsioses are transmitted by several types of arthropods (including ticks, chiggers, fleas, and lice) and are distributed worldwide. Japanese spotted fever (JSF) was discovered as an emerging rickettsiosis in 1984. The annual number of cases has increased 3-fold during the last decade. In Japan, JSF has been mainly reported in an area with warm climate that borders the Pacific Ocean. We describe a family/neighborhood cluster of three cases of JSF in an area of Japan that had previously not been considered endemic.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1801
[Cu] Class update date: 180308
[Lr] Last revision date:180308
[St] Status:In-Data-Review
[do] DOI:10.4269/ajtmh.17-0199

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[PMID]: 29512013
[Au] Autor:Ramírez-Islas ME; De la Rosa-Pérez A; Altuzar-Villatoro F; Ramírez-Romero P
[Ad] Address:National Institute of Ecology and Climate Change, Periférico 5000 Col. Insurgentes Cuicuilco, Delegación Coyoacán, 04530, México City, Mexico. marthel72@hotmail.com.
[Ti] Title:Total mercury concentration in two marine fish species, mackerel (Scomberomorus sp.) and snapper (Lutjanus sp.), from several Mexican fishing ports.
[So] Source:Environ Sci Pollut Res Int;, 2018 Mar 06.
[Is] ISSN:1614-7499
[Cp] Country of publication:Germany
[La] Language:eng
[Ab] Abstract:Mercury and methylmercury concentrations were evaluated in two marine fish species captured and consumed in Mexico, snapper (Lutjanus sp.) and mackerel (Scomberomorus sp.), obtained from several fish ports on the Pacific Ocean and the Gulf of Mexico. Significant differences were found between the median total mercury concentrations in snapper and mackerel, which were 0.187 and 0.125 µg/g (ww), respectively. Differences in the total mercury concentration in snapper were observed between the different oceans; snappers from the Gulf of Mexico registered a higher median mercury concentration (0.233 µg/g) than those caught in the Pacific Ocean (0.150 µg/g). Ninety-three percent of all samples presented had mercury concentrations that did not exceed the maximum limit (0.5 µg/g) specified by Mexican regulations, although 21% exceeded the US EPA limit of 0.3 µg/g, and three samples had mercury concentrations that were above the FDA recommended limit of 1 µg/g. Mackerel and snapper collected in the ports of Tampico and Mazatlan (economically important industrial cities and fishing sites) had the highest concentrations of total mercury, compared with those obtained from Acapulco and Ensenada (important touristic centers), which showed the lowest values. Recommendations should be made for the maximum allowed consumption of these fish in Mexico, especially for populations settled in shorelines where fish is essential for the daily diet.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180307
[Lr] Last revision date:180307
[St] Status:Publisher
[do] DOI:10.1007/s11356-018-1617-y


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