BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Fansheng Meng,Limeng Xi,Dongfang Liu,Weiwei Huang,Zhongfang Lei,Zhenya Zhang,Wenli Huang
The effects of light intensity (0–225 µmol m −2 s −1 ) on oxygen distribution, lipid production and biological community structure of algal-bacterial granules were investigated in six identical photo-sequencing batch reactors (with a dark/light cycle of 12 h/12 h). Typically green algal-bacterial granules could be developed at a light intensity of ≥135 µmol m −2 s −1 . The lipid content was significantly increased under higher light intensity, while the percentage of saturated fatty acid methyl esters was remarkably decreased. Results showed that light intensity ≥90 µmol m −2 s −1 yielded enough O 2 production from algae, creating aerobic/anoxic zone (0.3–0.6 mg-O 2 /L) in the core of granules and thus efficient algal-bacterial symbiosis system. Enhanced nitrogen and phosphorus removals were achieved in the reactors with stronger light illumination, probably attributable to the enrichment of ammonia oxidizing bacteria (Comamonadaceae and Nitrosomonadaceae) and algae ( Navicula and Stigeoclonium ). Illuminance ≥180 µmol m −2 s −1 was found to be unfavorable for Nitrospiraceae.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2025
·
IF 8
Xiaoer Wu,Ying Yang,Shuang Xie,Ping Zhong,Ning Xu
Harmful algal blooms formed by the mixotrophic dinoflagellate Akashiwo sanguinea are toxic to multiple aquatic organisms, although the relationship between toxicity and grazing is unknown. In this study, the effects of irradiance and nutrient levels on the grazing rate of A. sanguinea on the cryptophyte Rhodomonas salina were investigated using an optimized stable isotope method. Under light-limited conditions (0–30 μmol photons m −2 s −1 ), A. sanguinea exhibited higher hemolytic activity and grazing rate. Under the same level of irradiance, the growth and respiration rates were higher in co-culture treatments, while the oxygen release rate was higher in monoculture treatments. The growth rate, hemolytic activity, and grazing rate of A. sanguinea increased significantly with higher nutrient levels or an unbalanced N:P ratio. The hemolytic activity and grazing rate were higher in urea treatment, while the growth rate was higher in ammonia treatment. This study suggests that toxicity is involved in the feeding process of the mixotrophic dinoflagellate A. sanguinea ; the unique feeding flexibility adapting to low irradiance, increased nutrients, unbalanced N:P ratio, and organic nitrogen urea gains an advantage in interspecific competition among phytoplankton.
研究领域:
海洋生物学
·
生态毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Wei Zeng,Mingjun Wang,Yuan Li,Jiawei Wan,Huihui Huang,Hong Tao,David L. Carroll,Xingzhong Zhao,Dechun Zou,Guojia Fang
A semi-closed tubular light-trapping geometry is developed for dye sensitized solar cell to stabilize its power conversion efficiency (PCE) in wide light intensity range. The tubular cell consists of a dye-sensitized porous TiO 2 coated and semi-closed glass tube as photoanode, an opaque platinum metal foil wrapped on the outside of photoanode as counter electrode, and electrolyte filling in their interlayer . The open end of photoanode serves as the only light entrance. The experiment, calculation and optical studies demonstrated that the tubular geometry is beneficial to light trapping and absorption, charge transport and heat dissipation, in comparison to a planar counterpart. The PCE of tubular cell can remain about 85% of its original value even if the irradiated light intensity increases from 1 to 5 Sun, in contrast, that of planar counterpart decreases to about 60% of its original value. This feature makes the tubular cell has potential as an effective light collector in low-cost condenser solar cell system.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2024
·
IF 5.3
Chuang Deng,Xiang Liu,Fuchang Liao,Shuiqing Chen,Lingguang Yang,Peipei Yin
Photinia × fraseri is an important ornamental plant species widely cultivated in China with vibrant leaf color. However, there is limited information about the difference of phenolic constituents and bioactivity among P. fraseri leaves (PFL) with varied color, and the key factor which determines its color formation. Therefore, the aim of the present study was devoted to establishing the correlation among leaf color, anthocyanins and polyphenols profiles, together with antioxidant activity of PFL under varied light intensity. Results of color and pigment analysis on the four PFL groups indicated that total anthocyanins content was positively correlated with red color formation. Meanwhile, red leaves further exhibited a higher level of total anthocyanins (0.66 ± 0.02 mg/g), phenols (24.86 ± 1.33 mg/g), tannins (6.98 ± 0.23 mg/g), phenolic acids (73.60 ± 3.56 mg/g), condensed tannins (131.24 ± 5.51 mg/g), flavanols (3.42 ± 0.03 mg/g), flavonols (57.58 ± 0.19 mg/g), and antioxidant activities (0.17 ± 0.00 mmol/g for DPPH, 0.99 ± 0.06 mmol/g for ABTS, 1.73 ± 0.03 mmol/g for FRAP). Furthermore, a total of 11 phenolic compounds were identified from PFL, while caffeoylquinic acid derivatives and cyanidin-3- O -glucoside were the key phenolic compounds rich in red leaves. Principal component, hierarchical cluster, and correlation analysis indicated that high light intensity was the key factor responsible for the red color formation, as well as the high levels of total anthocyanins, phenolic acids and flavanols and antioxidant activities in the red leaves. Overall, the present study shall contribute to the exploration of the medicinal potential of the important horticultural plant P. fraseri and provide theoretical guidance for its further industrial development and application.
研究领域:
植物科学
·
植物化学
·
园艺学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 108
·期 1
·1-17
·
IF 3.9
Li Meng,Ghonimy Abdallah,Chen Dai-Qiang,Li Ji-Tao,He Yu-Ying,López Greco Laura Susana,Dyzenchauz Fernando,Chang Zhi-Qiang
The gut microbial communities interact with the host immunity and physiological functions. In this study, we investigated the bacterial composition in Litopenaeus vannamei shrimp’s gut and rearing water under different host (developmental stage: juvenile and adult; health status: healthy and diseased) and environmental factors (temperature 25 °C and 28 °C; and light intensity: low and high). The PCoA analysis showed that all water samples were clustered together in a quarter, whereas the gut samples spread among three quarters. In terms of functional bacteria, gut samples of adult shrimp, healthy adult shrimp, adult shrimp raised at 28 °C, and juvenile shrimp under high light intensity exhibited a higher abundance of Vibrionaceae compared to each other opposite group. Gut samples of juvenile shrimp, infected adult shrimp, juvenile shrimp with low light intensity, and adult shrimp with a water temperature of 25 °C showed a higher abundance of Pseudoaltromonadaceae bacteria compared to each other opposite group. Gut samples of juvenile shrimp, healthy adult shrimp, adult shrimp raised at a water temperature of 28 °C, and juvenile shrimp with high light intensity showed the higher abundance of Firmicutes / Bacteroidota ratio compared to each other opposite group. Our results showed that L. vannamei juveniles are more sensitive to bacterial infections; besides, water temperature of 28 °C and high light intensity groups were both important conditions improving the shrimp gut bacterial composition under industrial indoor farming systems. Key points • Bacteria diversity was higher among shrimp intestinal microbiota compared to the rearing water . • Shrimp juveniles are more sensitive to bacterial infection compared to adults . • Water temperature of 28 °C and high light intensity are recommended conditions for white shrimp aquaculture . Graphical
研究领域:
水产养殖
·
微生物学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Foods
·
2025
·Vol. 14
·期 17
·2975
·
IF 5.1
Yuan Gao,Nan Jiang,Jing Liu,Guanglu Cui,Meng Zhao,Yuanfang Du,Hua Ping,Cheng Li
Volatile compounds greatly affect tomato aroma, but systematic analysis of volatiles in tomatoes is limited by detection techniques. Here, HS-SPME Arrow-GC × GC-Q/TOFMS was employed to analyze tomato flavor profiles across different cultivation times. To investigate the effects of light and temperature on aroma profiles, three tomato samples across different cultivation periods, including S1 (harvested on May 30th, with lowest temperature and light conditions), S2 (harvested on August 10th, with the highest temperature and light), and S3 (harvested on June 27th, with moderate temperature and light), were analyzed. Overall, 227 volatiles were identified, belonging to 9 aroma categories. Hexanal,(E)-2-hexenal, nonanal,(E)-2-Octenal,trans-geranylacetone, 6-methyl-5-hepten-2-one, 3,4-Octadiene, 7-methyl-, and citral were found to be the key volatiles contributing most significantly to differentiating the samples across cultivation periods, imparting grassy and floral–fruity notes, respectively. The S1 tomatoes had a distinct grassy aroma, whereas the S3 tomatoes had a floral/fruity fragrance. Most differential metabolites were correlated with fatty acid, amino acid, and isoprenoid pathways. S1 tomatoes were characterized by fatty aldehydes (mainly C6/C9), and S2 tomatoes contained high concentrations of fatty alcohols. S3 tomatoes were positively correlated with isoprenoid-derived volatiles. These variations might be caused by the fluctuations in daily temperature and light intensity. This work establishes a foundational reference for assessing environmental effects on tomato flavor profiles.
研究领域:
食品科学
·
植物科学
·
分析化学
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农业科学
·
代谢组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）