GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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2024
·Vol. 25
·期 1
·e2023GC011111
·
IF 2.9
Jianlin Liao,Jieyun Chen,Xiaoming Sun,Yinan Deng,Yanjingyu Wang,Dajin Wang,Gang Hong,Lukas Klose,Andrea Koschinsky
Increasing interest in high-tech metals (e.g., rare earth elements and yttrium, REY) has triggered extensive research on the enrichment of these metals in pelagic sediments. In the sediments collected worldwide, Ca-phosphate and Fe-Mn (oxyhydr)oxides are targeted as the two most important REY carriers based on multiple geochemical and mineralogical analyses. However, the formation of the REY-rich stratum remains enigmatic as the influences of diagenesis and the local restrictions of different oceanic basins are complex, which require further investigation. In our study, we analyzed four sediment cores from the Western, Central North, and Eastern South Pacific (WP, CNP, and ESP), which are three of the most promising REY-rich regions in global oceans. Sequential leaching quantifies the dominance of Ca-phosphate by controlling ∼73.9%–93.3% of ΣREY and the secondary role of Fe-Mn (oxyhydr)oxides by holding up to ∼97.8% of Ce and ∼4.82%–13.9% of ΣREY. The shallowly and deeply buried sediments show similar features regarding the REY proportions hosted by different phases, which indicates that the REY accumulation by Ca-phosphate might majorly occur on the seawater-sediment interface. The geochemistry of the studied sediment cores reveals that (a) REY enrichment in ESP is affected by hydrothermal Fe-Mn (oxyhydr)oxides which can promote adsorptions of P and REY. (b) The Fe and Mn contents in WP sediments show an inverse relationship against REY enrichment which might be explained by the dust input from Central Asia. (c) The slow sedimentation rate of CNP enables the extraordinary REY-uptake by Ca-phosphate, but the low flux of phosphorus constrains the formation of high-grade REY deposits. Key Points The rare earth elements and yttrium (REY) held by Ca-phosphate and Fe-Mn (oxyhydr)oxides in pelagic sediments are quantified by sequential extraction Ca-phosphate mainly scavenges REY at the seawater-sediment interface on the seafloor Local constraints on REY-rich sediments from different pelagic basins relate to their material sources (e.g., eolian dust and hydrothermal vent) Plain Language Summary Rare earth elements and yttrium (REY) are useful for geological studies and valuable materials for cutting-edge technologies. Recently, scientists found high REY contents in deep-sea sediments, which could be future resources. However, its enriching mechanism is not fully understood. Here, we analyze the geochemistry of four sediment cores across the Pacific. The samples were sequentially leached with chemical solutions to separate different mineral phases. The results reveal that Ca-phosphate (e.g., fish fossils) is the main carrier holding ∼73.9%–93.3% of REY, and Fe-Mn (oxyhydr)oxides (e.g., small Fe-Mn nodules) hold ∼4.82%–13.9%. The proportions of REY hosted by the carriers are similar among the layers ranging from the surface to 8-m depth. This indicates that the REY accumulation mostly happens on the seafloor surface. Additionally, this study reveals that the REY-rich sediments in the Eastern South Pacific are likely related to underwater hot vents that release more Fe and Mn to accumulate P and REY. In the Western Pacific, the levels of REY seem to be affected by dust coming from Central Asia. In the Central North Pacific with slow sedimentation rates, fish fossils can take up high REY, but their low amount limits the formation of high-quality REY deposits.
CAS / MDL:
研究领域:
海洋地质学
·
地球化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Guang Gao,Lin Gao,Qianqian Fu,Xinshu Li,Juntian Xu
Integrated multi-trophic aquaculture (IMTA) has been proposed as a potential solution to supply aquatic food in an environmentally friendly way. However, little is known regarding the impacts of IMTA on the growth rates and food quality of both animals and plants, as well as the seasonal effects. In this study, we conducted field mesocosm experiments using monoculture and coculture systems with the shrimp Litopenaeus vannamei and the macroalga Ulva linza for four weeks in different seasons (autumn, spring and summer) to address the research gap. To evaluate the environmental pollution caused by shrimp culture, there was no water exchange for culture systems including shrimps. Compared to monoculture of L. vannamei , coculture with U. linza significantly reduced dissolved inorganic nitrogen (DIN, 98.5–99.0%) and dissolved inorganic phosphorus (DIP, 98.2–98.8%) but enhanced dissolved oxygen (DO, 56.2–68.7%) and pH (10.7–18.6%) by the end of culture. Compared to monoculture, coculture stimulated the growth rates of L. vannamei by 38.1–58.8% and U. linza by 241.9–290.4% in all seasons, and increased the lipid content of L. vannamei by 24.2% in autumn and by 37.9% in summer and the contents of protein and ash of U. linza by 23.8–29.0% and by 27.6–68.6%, respectively, in all seasons. Coculture enhanced the content of most amino acids in U. linza and the content of total fatty acids (FA) and polyunsaturated fatty acids in L. vannamei in all seasons in comparison with monoculture. In addition, coculture lifted swelling capacity by 28.9–40.5%, water holding capacity by 39.8–43.3% and oil holding capacity by 31.4–32.4% for U. linza in autumn and summer. Apart from relieving eutrophication , deoxygenation and acidification, IMTA increased growth rates of both shrimp and Ulva and improved functional properties of U. linza , suggesting a green and productive aquaculture mode.
研究领域:
水产养殖学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Functional Foods
·
2017
·
IF 3.144
Chunqing Ai,Na Ma,Xiaona Sun,Mengmeng Duan,Sufeng Wu,Jingfeng Yang,Chengrong Wen,Shuang Song
Various bioactivities of sulfated polysaccharides have been demonstrated, but the exact mechanisms involved are still unclear, which can be mainly attributed to a lack of recognition of polysaccharides metabolism in vivo . To define action mechanisms of sulfated polysaccharide from pacific abalone (AGSP), its metabolic characteristics were first evaluated in a mice model. The result showed that AGSP was hard to be absorbed into plasma, and most might be excreted from the body via feces. The in vitro models showed that human digestive juices had no effects on AGSP, and AGSP could exert its bioactivities by modulating the gut microbiota composition. It was noteworthy that small AGSP fragment was also hard to be absorbed by the body. In summary, this study demonstrated that various bioactivities of AGSP could be mainly attributed to the modulation of the gut microbiota rather than direct action on body organs far away from the digestive tract.
研究领域:
海洋生物学
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营养学
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微生物学
✓ 已验证
DOI
高影响因子
FISH & SHELLFISH IMMUNOLOGY
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2022
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IF 4.622
Feng Hu,Yan Wang,Jingjie Hu,Zhenmin Bao,Mengqiang Wang
Lysozyme is relevant to the innate immune system as a vital protein for crustaceans. In the present study, we cloned and characterized a novel c-type lysozyme gene ( Lv LYZ) from the Pacific white shrimp ( Litopenaeus vannamei ). The obtained full-length cDNA of Lv LYZ was 990 bp and contained an open reading frame of 693 bp. Its deduced amino acid sequence consisted of 230 amino acids (aa) with a 17 aa signal peptide at the N-terminal and 130 aa functional domains. The multiple sequence alignment (MSA) indicated that the typical active sites in Lv LYZ were similarly conserved as c-type lysozymes from other species. The transcription of Lv LYZ appeared in all detected tissues and had relatively higher expression levels in hemocytes , hepatopancreas , gill and intestine. The mRNA expression profiles of Lv LYZ were up-regulated in hemocyte and hepatopancreas post the stimulation of Vibrio parahaemolyticus or white spot syndrome virus (WSSV), respectively. The recombinant protein of Lv LYZ (r Lv LYZ) exhibited antibacterial activities against various microbes, including Escherichia coli , Vibrio splendidus , Micrococcaus luteus , Vibrio parahaemolyticus and Staphylococcus aureus . These results indicated that Lv LYZ could cope with bacteria in L. vannamei and may play a significant role in immune response against invading pathogens.
研究领域:
分子生物学
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免疫学
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水产养殖学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 45
·455601
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IF 3.399
Xiaoshuang Chen,Xiangfeng Guo,Lihua Jia,Xin Wang,Kun Song,Chunling Zuo,Rui Yang,Jinping Wang
Optimizing of electrocatalytic hydrogen evolution reaction (HER) activity is still a gigantic challenge for improving catalysts in renewable energy field. In this research, large-scale neoteric three-dimensional (3D) hierarchical MoSe2 hollow sphere arrays with like-Pacific Plate architecture were triumphantly prepared via a facile and reliable approach. The like-Pacific Plate architecture consists of many 3D MoSe2 arrays plates with the dimensions of 10–35 μm, which is assembled by plentiful closely connecting hierarchical MoSe2 hollow spheres with the outer diameter, hierarchically secondary unit size and shell thickness of 450 nm, 25 nm and 10 nm, respectively. The products exhibited remarkable HER performance with small Tafel slope (58.5 mV dec−1), low overpotential (169.8 mV) at 10 mA cm−2, high conductivity and durable stability, which are attribute to the mechanisms (1) 3D hollow framework furnishes large specific surface area, (2) hierarchical structure generates more active sites, (3) like-Pacific Plate architecture facilitates the touch of electrolyte and catalyst, and (4) closely packed arrays expedite the migration of electron. The current work indicates that unique 3D hierarchical hollow sphere arrays with like-Pacific Plate architecture will be a potential candidate for effective electrocatalytic water splitting catalyst material with energy source application.
研究领域:
材料科学
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可再生能源
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
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2024
·Vol. 129
·期 11
·e2024JC021414
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IF 3.3
Junyi Ni,Mingming Chen,Jiaming Shen,Li Liu,Zong-Pei Jiang,Kuanbo Zhou,Xiaolin Li,Minhan Dai,Yao Zhang
The cyclonic eddy uplifts nutrient-rich seawater into the euphotic zone, typically directly enhancing phytoplankton abundance and primary production. However, its impact on heterotrophic prokaryotic production (HPP) remains unclear due to the complex interplay of multiple indirect factors governing this process. Here, we conducted a comprehensive investigation of the distribution of picophytoplankton and heterotrophic prokaryotes, prokaryotic community structure, and HPP within a cyclonic eddy in the western North Pacific subtropical gyre. The results indicated that despite the higher abundance of picophytoplankton accompanied by nutrient upwelling at the eddy core compared to the edge, higher levels of HPP were observed at the eddy edge between 100 and 200 m, consistent with the distribution of the low nucleic acid content (LNA) prokaryotes. The significant positive correlation between HPP and the proportion of LNA group in total heterotrophic prokaryotes suggested a primary contribution from the LNA group over the high nucleic acid content (HNA) group. SAR11, a typical member of the LNA group, may primarily contribute to the elevated HPP observed at the eddy edge. The changes in temperature, nutrients, and light intensity induced by the cyclonic eddy may significantly influence the distribution and activity of HNA and LNA groups, potentially exerting a greater impact on HPP compared to phytoplankton-related factors. These findings contribute to understanding the underlying mechanisms of HPP responses to cyclonic eddies in the oligotrophic open ocean. Key Points Higher heterotrophic prokaryotic production (HPP) occurred at the eddy edge, while picophytoplankton predominantly occurred in the core The elevated HPP at the eddy edge was attributed to low nucleic acid prokaryotes, such as SAR11 The altered temperature, nutrients, and light intensity may impact the distribution and HPP in the eddy Plain Language Summary Mesoscale eddies are common features of global ocean circulation. Cyclonic eddies uplift isopycnals at their centers, bringing cold, nutrient-rich waters from the lower layers to the surface within the eddy, thereby promoting higher phytoplanktonic abundance and primary production typically observed at the eddy core. However, the response of heterotrophic prokaryotic distribution and heterotrophic prokaryotic production (HPP) to the upwelling in the cyclonic eddy remains unclear, as limited studies have not yet reached a consensus. We tracked a cyclonic eddy in the western North Pacific subtropical gyre to compare prokaryotic abundance, community composition, and HPP between eddy core and edge. The results indicate that, while picophytoplankton abundance was higher at the eddy core compared to the edge, HPP was predominantly elevated at the edge in response to the cyclonic eddy. The low nucleic acid content (LNA) prokaryotes dominated by SAR11 may significantly contribute to the increased HPP, as opposed to the traditionally assumed high nucleic acid content (HNA) group. The main factors influencing the distribution of LNA and HNA groups, as well as HPP, include temperature, nutrients, and light intensity altered by the eddy. This study advances the understanding of heterotrophic prokaryotic responses to cyclonic eddy dynamics.
研究领域:
海洋微生物学
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海洋学
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生物地球化学
✓ 已验证
DOI
高影响因子
Frontiers in Nutrition
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2021
·
IF 6.576
Jiao Yadan,Liu Chune,Feng Chunsong,Regenstein Joe M.,Luo Yongkang,Tan Yuqing,Hong Hui
Deltamethrin (DEL) can be introduced into the food chain through bioaccumulation in Pacific oysters, and then potentially threaten human health. The objective of this study was to investigate the bioaccessibility of DEL in oysters with different cooking methods after simulated digestion. DEL content in different tissues of oysters going from high to low were gills, mantle, viscera, and adductor muscle. Bioaccessibility of DEL in oysters decreased after steaming (65%) or roasting (51%) treatments compared with raw oysters (82%), which indicated that roasting can be used as a recommended cooking method for oysters. In the simulated digestion process, the concentration of DEL in the digestive juice and the bioaccessibility of DEL were affected by the pH in the gastric phase. And the transport efficiency of DEL through the monolayer molecular membrane of NCM460 cells ranged from 35 to 45%. These results can help assess the potential harm to consumers of DEL in shellfish. Furthermore, it provides a reference for the impact of lipophilic toxins in seafood.
研究领域:
食品科学
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毒理学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Oceanology and Limnology
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2021
·Vol. 39
·期 5
·1622-1633
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IF 1.265
Qu Yang,Xu Kuidong,Li Tao,Wang Maoyu,Zhong Huan,Chen Tianyu
The ocean is an important inventory of anthropogenic mercury (Hg), yet the history of anthropogenic Hg accumulation in the ocean remains largely unexplored. Deep-sea corals are an emerging archive of past ocean chemistry, which take in sinking or suspended particulate organic matter as their food sources. Such organic matter would exchange Hg with the local seawater before being consumed by the deep, sea corals. As such, the organics preserved in the coral skeleton may record the Hg evolution of the ambient seawater during the time of coral growth. Here, we report the first data on Hg concentrations variability of a deep-sea proteinaceous coral in the oligotrophic North Pacific at the water depth of 1 249 m, in attempt to understand the transfer of anthropogenic Hg into the deep Pacific ocean over the last seven centuries. We find that the Hg concentrations of different coral growth layers have remained relatively constant albeit with considerable short-term variability through time. The overall stable Hg concentration of the last seven centuries recorded in our sample suggests that anthropogenic pollution is not yet a clearly resolvable component in the deep oligotrophic North Pacific waters, in agreement with recent estimation from modelling works and observational studies of modern seawater profiles. As there is hardly an unambiguous way to separate anthropogenic Hg from the natural background based on recent seawater profiles, our historical data provide valuable information helping to understand the oceanic cycle of Hg through time.
研究领域:
海洋地球化学
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环境科学
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古气候学
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生物地球化学循环
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深海生态学
✓ 已验证
DOI
高影响因子
Animal Nutrition
·
2024
·
IF 6.1
Menglin Shi,Haomin Li,Tianyu Chen,Bocheng Huang,Xiaoyue Li,Xiaohui Dong,Shuyan Chi,Qihui Yang,Hongyu Liu,Junming Deng,Beiping Tan,Shuang Zhang,Shiwei Xie
This experiment aimed to evaluate the impact of dietary hydroxyproline (Hyp) supplementation on the flesh quality of juvenile Pacific white shrimp ( Litopenaeus vannamei ) fed a low fishmeal diet. Six formulated diets included one high fishmeal (HF; 25% fishmeal content) and five low fishmeal diets (10% fishmeal content) with 0%, 0.2%, 0.4%, 0.6% and 0.8% Hyp (LF0, LF2, LF4, LF6 and LF8, respectively). Each diet was assigned to four replicates and 40 shrimp (0.32 ± 0.00 g) per replicate were fed four times a day for 8 weeks. Dietary Hyp supplementation had little effects on growth performance, but significantly increased the contents of Hyp, prolyl 4-hydroxylases (P4Hs), and collagen ( P < 0.05). The meat yield, springiness, hardness, chewiness, and cohesiveness of muscle were the highest in the LF2 group. Cooking loss and freezing loss of muscle were the lowest in the LF2 group ( P < 0.05). Dietary supplementation with 0.4% Hyp increased the myofiber density and decreased the myofiber diameter of muscle ( P < 0.05). Supplementation of Hyp in the diet up-regulated the mRNA expression of smyhc5 , smyhc15 , col1a1 , col1a2 , igf-1f , tgf-β and tor , and down-regulated the mRNA expression of smyhc 1 , smyhc 2 , smyhc 6a ( P < 0.05). Supplementation of Hyp in the diet up-regulated the protein expression of P-4E-BP1, P-AKT, AKT and P-AKT/AKT ( P < 0.05). These results suggested that the addition of 0.4% Hyp to low fishmeal diets improved the flesh quality of L. vannamei .
研究领域:
水产养殖
·
营养学
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海洋生物学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zixu Zhang,Rongrong Chen,Jingyuan Liu,Gaohui Sun,Hongsen Zhang,Peili Liu,Rumin Li,Jun Wang
The adhesion of marine fouling organisms and wave-induced ice accretion poses significant challenges to marine infrastructure, leading to substantial economic losses. Inspired by the Pacific salmon mucus, which exhibits both antibacterial and antifreeze properties, an amphiphilic liquid-like fluorocarbon composite coating (PFDNK) with antifouling/anti-icing cyclability and durability is fabricated by integrating thiol-modified tungsten carbide (K-WC) as cross-linking sites into a polyurethane/polyurea-modified fluorocarbon polymer. Remarkably, PFDNK (underwater coefficient of friction ∼0.1) significantly reduces biofouling adhesion (98.6 ± 6.1% inhibition ratio against Pseudomonas xiamenensis) and ice adhesion strength (∼10.0 ± 0.9 kPa after 20 icing/deicing cycles). The presence of multiple hydrogen bonds within PFDNK effectively enhances its mechanical properties, achieving a tensile stress of 12.9 MPa and an elongation at break of 608%. Furthermore, under solar irradiation, K-WC endows the coating with photothermal properties, enabling exceptional contact-killing efficacy and ice-melting capability. PFDNK demonstrates outstanding frost- and snow-resistant performance under real-world low-temperature conditions, maintains excellent antifouling durability for approximately 240 days in marine environments, presents a promising solution for marine equipment spanning temperate and low-temperature zones, and expands applications in the marine industry.
研究领域:
材料科学
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海洋工程
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表面科学
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高分子化学
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防污技术
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低温工程
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功能涂层
✓ 已验证
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Zhongshi Wang,Zhiming Yu,Liyan He,Jianan Zhu,Lidong Liu,Xiuxian Song
Electrophysiology studies the electrical properties of cells and tissues including bioelectrical signals and membrane ion channel activities. As an important means to reveal ion channel related physiological functions and the underlying mechanisms, electrophysiological techniques have been widely used in studies of animals, higher plants and algae that are closely related to higher plants. However, few electrophysiological studies have been carried out in red tide organisms, especially in dinoflagellates, which is mainly due to the complex surface structure of dinoflagellate amphiesma. In this study, the surface amphiesma of Alexandrium pacificum , a typical red tide species, was removed by centrifugation, low-temperature treatment and enzymatic treatment. In all three treatments, low-temperature treatment with 4 °C for 2 h had high ecdysis rate and high fixation rate, and the treated cells were easy to puncture, so low-temperature treatment was used as a preprocessing treatment for subsequent current recording. Acquired protoplasts of A. pacificum were identified by calcofluor fluorescence and immobilized by poly-lysine. A modified “puncture” single-electrode voltage-clamp recording was first applied to dinoflagellates, and voltage-gated currents, which had the characteristics of outward K + current and inward Cl − current, were recorded and confirmed by ion replacement, indicating the voltage-gated currents were mixed. This method can be used as a technical basis for the electrophysiological study of dinoflagellates and provides a new perspective for the study of stress tolerance, red tide succession, and the regulation of physiological function of dinoflagellates.
研究领域:
海洋生物学
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电生理学
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细胞生物学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
AQUACULTURE
·
2024
·
IF 3.9
Kunyin Jiang,Hong Yu,Lingfeng Kong,Shikai Liu,Shaojun Du,Qi Li
The visually appealing shell colours and intricate patterns of shellfish not only attract consumers but also enhance their economic value. Understanding the inheritance pattern of shell colour and the molecular mechanism of pigmentation is highly important for enhancing breeding efficiency. This study involved the identification of a tyrosine hydroxylase gene ( CgTH ) and the investigation of its function in the metabolism of tyrosine and pigmentation in Pacific oysters. CgTH contains a conserved Biopterin_H domain that consists of a binding site for iron atoms and a binding site for tetrahydrobiopterin (BH4). Quantitative PCR (qPCR) and immunofluorescence analysis revealed that the expression of CgTH was higher in the mantle of black shell oysters in comparison to the white strain. The in vitro and in vivo experiments confirmed that Cg TH is involved in tyrosine metabolism through the catalysis of the conversion of L-tyrosine to L-DOPA. In order to examine its functions in melanin synthesis in oysters, 3-Iodo-L-tyrosine (3-IT) treatment, RNA interference (RNAi), and L-DOPA treatment assays were conducted. The results of our study showed that 3-IT effectively inhibited Cg TH activity, leading to a suppression of tyrosine metabolism. Knockdown of Cg TH hindered the cAMP-CREM-MITF axis and decreased pigmentation. On the other hand, L-DOPA stimulated melanin production through cAMP signaling and counteracted the inhibitory effects of 3-IT on the metabolism of tyrosine. These data indicated that there may be a feedback loop involving Cg TH and the cAMP-CREM-MITF axis that regulates tyrosine metabolism and melanogenesis in Pacific oysters. This study enhances our understanding of the molecular mechanism that governs oyster pigmentation and offers a possible molecular indicator for the targeted breeding of particular strains of Pacific oysters ( Crassostrea gigas ).
研究领域:
海洋生物学
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分子生物学
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遗传学
·
水产养殖
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）