Forests
·
2024
·Vol. 15
·期 7
·1193
·
IF 2.4
Yingni Huang,Qianlin Li,Chunmei Bai,Wendi Zhao,Diego Ismael Rodríguez-Hernández,Xiali Guo
Recent studies on the intra-annual dynamics of trees were mainly focused on mature trees in natural forests; however, less is known about how topography (e.g., slope’s position and aspect) shape the intra-annual xylem formation dynamics of young trees in plantation forests. We monitored intra-annual xylem formation dynamics of 6-year-old Chinese fir (Cunninghamia lanceolata(Lamb.)) trees across two different aspects (northeast and southwest) and three different positions (upper, middle, and lower) of the slope in a planted forest in subtropical China. We found that the intra-annual xylem formation of trees on the northeast slope aspect (176.98 ± 34.52 cells) was significantly higher than that on the southwest slope aspect (140.19 ± 36.07 cells) due to the higher growth rate (0.67 ± 0.11 cells/day vs. 0.53 ± 0.10 cells/day). In the middle slope position, xylem formation (187.89 ± 19.81 cells) was also significantly higher than that of the upper (147.35 ± 29.08 cells) and lower slope positions (140.51 ± 48.36 cells), resulting from higher growth rate rather than longer growing season length. Our study demonstrated that intra-annual xylem formation dynamics of Chinese fir were altered by different topographic features and therefore encourage the implementation of management strategies that consider different slope aspects and positions to maximize forest productivity.
研究领域:
林学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 13
·1919
·
IF 4.7
Yang Lyu,Weipeng Sun,Tingyou Feng,Wenge Li,Yong Jiang,Chenglin Zuo,Shuangxi Wang
Steel structures located in subtropical marine climates face harsh conditions such as strong sunlight and heavy rain, and they are extremely corroded. In this study, a waterborne coating with excellent corrosion resistance, hydrophobic ability, high-temperature resistance and high density was successfully prepared by using modified nanoscale titania powders and grafted polymers. The effects of three modifiers on titania nanoparticles and waterborne coatings’ properties were studied independently. The experimental results showed that the activation index of the modification employing methacryloxy silane reached 97.5%, which achieved the best modification effect at 64.4 °C for 43.3 min. The waterborne coating with nanoscale titania modified by methacryloxy silane exhibited the best hydrophobic effect, with a drop contact angle of 115.4° and excellent heat resistance of up to 317.2 °C. The application of the waterborne modified coating in steel structures under subtropical maritime climates showed that the waterborne titania coatings demonstrated excellent resistance to corrosion, high temperatures and harsh sunlight, with a maximum service life of up to five years. Economic analysis indicated that, considering a conservative three-year effective lifespan, this coating could save more than 50% in cost compared with conventional industrial coatings. Finally, the strengthening mechanism of the polymer coatings with modified nanoscale titania was analyzed.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Functional Foods
·
2017
·
IF 3.144
Guan-Lin Chen,Xin Zhang,Song-Gen Chen,Men-Di Han,Yong-Qing Gao
In order to explore the potential of different subtropical fruit leaves as natural sources of bioactive compounds, free, esterified and insoluble-bound forms of total phenolic contents (TPC) and total flavonoid contents (TFC) were determined. The antioxidant activities of fruit leaves was determined by 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity (DPPH), ferric reducing antioxidant power (FRAP), and trolox equivalent antioxidant capacity (TEAC) assays. Furthermore, several phenolic compounds were detected using ultra performance liquid chromatography (UPLC) technique. Rutin, (+)-catechin, isoquercitrin, quercitrin and quercetin were widely found in these fruit leaves. The highest TPC, TFC and antioxidant capacities were found in Averrhoa carambola , Dimocarpus longgana Lour, Litchi chinensis Sonn , Mangifera indica and Psidium guajava Linn . The results implied that these leaves are important natural sources of antioxidants for preparing functional food ingredients and preventing oxidative stress diseases.
研究领域:
植物学
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食品科学
·
药理学
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DOI
高影响因子
JOURNAL OF APPLIED MICROBIOLOGY
·
2017
·Vol. 123
·期 5
·1274-1285
·
IF 2.099
Cui J.,Xiao M.,Liu M.,Wang Z.,Liu F.,Guo L.,Meng H.,Zhang H.,Yang J.,Deng D.,Huang S.,Ma Y.,Liu C.
AimsTo demonstrate a nonempirical workflow to select host‐specific probiotics for aquaculture industry.Methods and ResultsUsing both culture‐dependent and culture‐independent methods, we have systematically investigated, for the first time, the gut microbiota of twelve subtropical aquatic animal species. We found that the diversity, abundance and distribution of gut micro‐organisms of these animals were host‐specific and that lactic acid bacteria (LAB) were predominant among the indigenous probiotic microbes. Using culturing method, we isolated and characterized ninety‐eight LAB strains; however, only a few strains was representative of the dominant LAB OTUs recovered by culture‐independent analysis.ConclusionsTwo cultured LAB strains, Enterococcus faecalis LS1‐2 and Enterococcus faecium Z1‐2, capturing the major LAB OTUs in the sequencing data set of the most animal samples and showing significant antimicrobial activities against shrimp pathogens, were suggested to be the candidates of shrimp probiotics.Significance and Impact of StudyDisease outbreak and the consequential abuse of antibiotics have been the constraints to the aquaculture industry. However, the selection of probiotic bacteria is currently still an empirical process due to our limited knowledge on the gastrointestinal microbiota of aquatic organisms. Our study points to a nonempirical selection process by which host‐specific probiotics can be developed.
研究领域:
水产养殖
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微生物学
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分子生物学
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENT INTERNATIONAL
·
2025
·
IF 9.7
Kai-Sheng Yao,Pei-Liang Zhou,Hua-Qiao Yang,Li-Juan Tan,Lu-Kai Qiao,Qing-Hua Zhao,Feng-Jiao Peng,Guang-Guo Ying,Paul J. Van den Brink
Triclosan, a synthetic broad-spectrum antimicrobial agent, is commonly used in personal care products, household goods, and industrial items. Its extensive use and subsequent release have led to frequent detections in aquatic ecosystems worldwide, potentially harming ecosystem health. Therefore, an outdoor mesocosm experiment was conducted to assess the effects of triclosan on community structure (microbes, phytoplankton, zooplankton, and macroinvertebrates) and ecosystem functioning in freshwater ecosystems under sub-tropical conditions. Triclosan was applied daily in pulses at nominal concentrations of 0.05, 0.5, 5, and 50 µg/L over a three-week treatment period, followed by a five-week recovery period. Triclosan significantly affected the structure of microbial (NOEC = 0.5 µg/L), phytoplankton (NOEC = 5 µg/L), and zooplankton (NOEC = 5 µg/L) communities. In contrast, no significant effects were observed on the macroinvertebrate community in response to triclosan exposure. Within the microbial community, the phyla Cyanobacteria and Bacteroidetes showed consistent responses to triclosan exposure, with taxa in the Cyanobiaceae family being the most adversely affected. Among phytoplankton taxa, the cyanobacteria Cylindrospermopsis sp. had the lowest consistent NOEC (<0.05 µg/L), while the lowest NOEC (0.5 µg/L) among zooplankton taxa was observed for the copepods nauplii and Mesocyclops leuckarti . Piecewise structural equation modelling revealed that triclosan exposure resulted in significant direct and indirect effects across multiple trophic levels, ultimately disrupting ecosystem functioning related to carbon and nitrogen cycling. Hence, our study highlights the threat posed by environmentally relevant concentrations of triclosan to both community structure and ecosystem functioning in sub-tropical freshwater ecosystems.
研究领域:
生态毒理学
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环境科学
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水生生态学
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微生物生态学
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生态学
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环境毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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