SOUTH AFRICAN JOURNAL OF BOTANY
·
2020
·
IF 1.792
Hanzhi Liang,Yuping Xiong,Beiyi Guo,Haifeng Yan,Shuguang Jian,Hai Ren,Songjun Zeng,Kunlin Wu,Jaime A. Teixeira da Silva,Youhua Xiong,Guohua Ma
Scaevola sericea (Gaertn.) Roxb., which is a semi-mangrove halophyte, displays low seed germination (SG) and poor development. A model system was established to assess seed viability (SV) and enhanced SG in response to 2,3,5-triphenyl-tetrazolium chloride (TTC), and to detect SV under different storage conditions and duration to establish an optional storage method for seeds. Percentage SG (SG%) was also tested with different periods of soaking in water, gibberellic acid (GA 3 ) and seawater after removing fruit pulp. Optimal detection of the percentage of SV (SV%) was possible when seeds were soaked for 3 h in 0.4% TTC. In these conditions, after 15 d, SV% exceeded 90.0%. This indicates that low SG was not related to SV under natural conditions. The nutritious epicarp (pulp) of intact fruit is easily infected by mildew, rotting rapidly in high relative humidity (60–90%). When pulp was removed from fruits, germination period was speeded up by almost 8 d (seeds germinated after sowing for 28 d). This also increased SG%. Seawater broke seed dormancy more efficiently than GA 3 . The SG% (59.0%) of seeds with their epicarp removed then soaked in seawater for 24 h was higher than seeds soaked in distilled water (24.0%) or in 200 mg/L GA 3 (33.7%) after sowing for 40 d The SV% of seeds stored at 4 °C was higher than seeds stored at room temperature (25±3 °C), but when storage period was extended to 180 d or longer, their SV% declined rapidly. In natural conditions, S. taccada seeds have a high SV%. The low SG% is caused by easily rotting pulp and the physiological dormancy of fruits. By removing the pulp and soaking naked seeds in seawater can break seed dormancy and achieve ideal SG which would benefit ecorestoration and landscaping projects.
研究领域:
植物学
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生态学
✓ 已验证
产品关联
DOI
高影响因子
ACS Earth and Space Chemistry
·
2019
·
IF 2.243
Shumin Cheng,Siyang Li,Narcisse T. Tsona,Christian George,Lin Du
The structure of sea spray aerosols (SSAs) has been described as a saline core coated by organic surfactants. The presence of surface-active compounds at the interface can exert significant effect on physical, chemical, and optical properties of SSAs. The surfactant molecules chosen for this study, palmitic acid (PA), stearic acid (SA), arachidic acid (AA), methyl palmitate (MP), methyl stearate (MS), and methyl arachidate (MA), were used to explore the effect of alkyl chain length, headgroups, and sea salts on the surface properties of these monolayers. Surface pressure–area (π–A) isotherms obtained with a Langmuir trough was used for revealing macroscopic phase behavior of the monolayers. Moreover, infrared reflection absorption spectroscopy (IRRAS) was employed to investigate the interfacial organization at the molecular level. The π–A isotherms indicated that sea salts, present in the subphase, have an intense condensing effect on fatty acid monolayers while exerting an expanding effect on fatty acid methyl ester monolayers, which was confirmed by results from IRRAS experiments. IRRAS further uncovered the all-trans conformation of the hydrocarbon chains, which can be evidenced by the relatively low νa(CH2) and νs(CH2) stretching vibrations. The conformational order changes in the alkyl chains of different film-forming species (C16 < C18 < C20) were directly revealed by analyzing the intensity ratios of the νa(CH2) and νs(CH2) bands. Thus, all three factors alter the phase behavior and molecular packing of the monolayers at the air–aqueous interface.
研究领域:
大气科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Jian Lu,Jie Wu,Jun Wu,Xia He
Microplastics widely exist in diverse matrices to become important hosts of pollutants. Little information regarding adsorption of emerging contaminants on coastal saline soils influenced by co-existing microplastics is available. Thus, the adsorption behaviors of nonylphenol (NP) on coastal saline soil influenced by microplastics were discussed. Polyvinyl chloride (PVC, 4.7 mm), polyethylene (4.85 mm), and polypropylene (4.51 mm) with addition dose of 10% were used to discuss the effect of microplastic type on adsorption of NP by coastal saline soil while PVC samples with size of 4.7 mm and 0.11 mm were used to explore the effect of microplastic size on NP adsorption. The NP adsorption capacity of the saline soil containing 10% of PVC (4.7 mm) was twice that of soil without PVC. Smaller-size PVC (0.11 mm) with addition amount of 10% enhanced the NP adsorption capacity of the coastal saline soil by 117% to reach 8.91 μg g −1 . The desorption capacity of NP on saline soil decreased from 40% to 30% of total adsorption capacity with co-existing PVC. Adsorption/desorption kinetics of NP on coastal saline soil with PVC microplastics could be well explained by pseudo second order model while Freundlich model could better fit the isotherm data of NP adsorption/desorption to show possible occurrence of the multiple-layer adsorption. This study will provide new information regarding the environmental behaviors of typical emerging contaminants on coastal saline soil containing microplastics.
研究领域:
环境科学
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土壤学
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污染生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Minglan Xu,Narcisse Tsona Tchinda,Siyang Li,Lin Du
The chemical composition of aerosols plays a significant role in aerosol-cloud interactions and, although saccharides make up their largest organic mass fraction, the current process model for understanding sea spray aerosol (SSA) composition struggles to replicate the enrichment of saccharides that has been observed. Here, we simulated the generation of SSA and quantified the enrichment of two soluble saccharides (glucose and trehalose) in SSA with a homemade sea spray aerosol generator. The results of the generation experiments demonstrated that both saccharides, especially trehalose, can promote the generation of SSA, whereas surface-active fatty acids primarily inhibit SSA production due to fewer bubble bursts caused by a large amount of foam accumulation. A significant decrease in surface tension of seawater with the addition of fatty acids was observed, while only a minor decrease was observed for seawater with the addition of only saccharide. Enrichment factors (EFs) of saccharides measured using high performance anion-exchange chromatography (HPAEC) with pulsed amperometric detection (PAD) revealed no enrichment of glucose in submicron SSA, while trehalose showed a slight enrichment. In the presence of surface-active fatty acids on the seawater surface, a significant increase in the enrichment of saccharides in SSA was observed, with glucose and trehalose showing EF of approximately 27-fold and 58-fold, respectively. Besides, this enrichment was accompanied by the accumulation of calcium and magnesium ions. The results presented here suggest that the coupling interaction mechanism of soluble saccharides and surface-active fatty acids on the ocean surface contributes to the enrichment of soluble saccharides in SSA.
研究领域:
大气科学
·
海洋化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Processes & Impacts
·
2018
·Vol. 20
·期 11
·1500-1511
·
IF 2.491
Junyao Li,Siyang Li,Shumin Cheng,Narcisse T. Tsona,Lin Du
Mixed Langmuir monolayers of cholesterol with both saturated and unsaturated fatty acids, stearic acid (SA), and oleic acid (OA) spread at the air–seawater surface were studied. The phase behavior, molecular interaction, and conformational order of the monolayers were investigated by surface pressure–area (π–A) isotherms and infrared reflection-absorption spectroscopy (IRRAS) measurements. The thermodynamic parameters of the mixed films, including excess molecular area and excess Gibbs free energy were calculated by using the isotherm data. The interaction between SA (or OA) and cholesterol varied with the molar fraction of the fatty acids and surface pressure. OA/chol monolayers showed the characteristics of miscibility, but they acted as nonideal systems. Cholesterol has been observed to have a stabilizing effect on OA monolayers. The negative values of the excess Gibbs free energy in the entire composition range demonstrated that mixed OA/chol monolayers were thermodynamically stable. IRRAS spectra showed that mixing with cholesterol changes the ordering of fatty acid monolayers at the air–seawater surface. The findings provide general information regarding the structural changes in the monolayer induced by lateral packing. These results help in the understanding of the mixing behavior of fatty acids and cholesterol and provide insights into the fate of the mixed-monolayer-coated sea salt aerosol in the ocean environment.
研究领域:
生物医学工程
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环境科学
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表面化学
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材料科学
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大气物理学
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物理化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Meizhen Jiao,Jie Lu,Jinguang Hu,Jian Du,Yanna Lv,Jinwen Hu,Yehan Tao,Haisong Wang
In this study, we introduce a novel two-step method for efficiently separating and utilizing reed biomass. The process involves seawater and ammonium chloride (SW/AC) pretreatment followed by high solid-phase ethanolamine (ETA) pretreatment. During the SW/AC pre-processing stage, metal ions and chloride ions in seawater facilitated the depolymerization of hemicellulose into xylo-oligosaccharides (XOS), yielding 44.71 %. Subsequently, the two-step SW/AC-ETA pretreatment achieved a lignin removal rate of 80.34 % and rose to yields of glucose (99.10 %) and xylose (84.95 %). Characterization via FTIR, XRD, and SEM analyses revealed significant disruption of the lignin-carbohydrate complex structure in the reed, thereby increasing cellulose accessibility from 136.99 mg/g in raw material to 526.32 mg/g. This study offers a novel, environmentally friendly, and efficient strategy for separating reed components.
研究领域:
生物化学工程
·
可再生资源利用
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 6
·118030
·
IF 6.2
Wei Wang,Qilin Guo,Zhe Wang,Donald B. Dingwell,Wenjia Song
Molten deposits originating from siliceous debris such as airborne dust, sand, or volcanic ash entrained into the intake air, represent a critical threat to the durability of thermal barrier coatings (TBCs). Such systems are usually approximated experimentally by on calcium-magnesium aluminosilicate melts (CMAS). While extensive studies have elucidated CMAS corrosion from the terrestrial sources listed above, the role of sea salts – ubiquitous in costal environments – remains unclear. Here, we investigate the effect of sea salt from four China sea regions on CMAS corrosion of TBCs. By integrating high-temperature wetting behavior, microstructural analysis and first-principles calculation, we demonstrate that the presence of sea salt accelerates TBC degradation and that its concentration governs its impact on CMAS melt fluidity, spreading, and degradation of TBCs. An optimized CMAS model is proposed to guide future corrosion assessments and design TBCs with improved tolerance to salt-accelerated degradation under coastal service conditions.
研究领域:
材料科学
·
陶瓷涂层
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高温腐蚀
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环境退化
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航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）