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学者姓名：石新国
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Abstract ：
Polyethylene terephthalate (PET) is a polymer synthesized via the dehydration and condensation reaction between ethylene glycol and terephthalic acid. PET has emerged as one of the most extensively employed plastic materials due to its exceptional plasticity and durability. Nevertheless, PET has a complex structure and is extremely difficult to degrade in nature, causing severe pollution to the global ecological environment and posing a threat to human health. Currently, the methods for PET processing mainly include physical, chemical, and biological methods. Biological enzyme degradation is considered the most promising PET degradation method. In recent years, an increasing number of enzymes that can degrade PET have been identified, and they primarily target the ester bond of PET. This review comprehensively introduced the latest research progress in PET enzymatic degradation from the aspects of PET-degrading enzymes, PET biodegradation pathways, the catalytic mechanism of PET-degrading enzymes, and biotechnological strategies for enhancing PET-degrading enzymes. On this basis, the current challenges within the enzymatic PET degradation process were summarized, and the directions that need to be worked on in the future were pointed out. This review provides a reference and basis for the subsequent effective research on PET biodegradation.
Keyword ：
Biodegradation pathway Biodegradation pathway Bioengineering modification Bioengineering modification Catalytic mechanism Catalytic mechanism PET-degrading enzyme PET-degrading enzyme
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| GB/T 7714 | Qiu, Jiarong , Chen, Yuxin , Zhang, Liangqing et al. A comprehensive review on enzymatic biodegradation of polyethylene terephthalate [J]. | ENVIRONMENTAL RESEARCH , 2024 , 240 . |
| MLA | Qiu, Jiarong et al. "A comprehensive review on enzymatic biodegradation of polyethylene terephthalate" . | ENVIRONMENTAL RESEARCH 240 (2024) . |
| APA | Qiu, Jiarong , Chen, Yuxin , Zhang, Liangqing , Wu, Jinzhi , Zeng, Xianhai , Shi, Xinguo et al. A comprehensive review on enzymatic biodegradation of polyethylene terephthalate . | ENVIRONMENTAL RESEARCH , 2024 , 240 . |
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Global climate change intensifies the water cycle and makes freshest waters become fresher and vice-versa. But how this change impacts phytoplankton in coastal, particularly harmful algal blooms (HABs), remains poorly understood. Here, we monitored a coastal bay for a decade and found a significant correlation between salinity decline and the increase of Karenia mikimotoi blooms. To examine the physiological linkage between salinity decreases and K. mikimotoi blooms, we compare chemical, physiological and multi-omic profiles of this species in laboratory cultures under high (33) and low (25) salinities. Under low salinity, photosynthetic efficiency and capacity as well as growth rate and cellular protein content were significantly higher than that under high salinity. More strikingly, the omics data show that low salinity activated the glyoxylate shunt to bypass the decarboxylation reaction in the tricarboxylic acid cycle, hence redirecting carbon from CO2 release to biosynthesis. Furthermore, the enhanced glyoxylate cycle could promote hydrogen peroxide metabolism, consistent with the detected decrease in reactive oxygen species. These findings suggest that salinity declines can reprogram metabolism to enhance cell proliferation, thus promoting bloom formation in HAB species like K. mikimotoi, which has important ecological implications for future climate-driven salinity declines in the coastal ocean with respect to HAB outbreaks.
Keyword ：
global climate change global climate change harmful algal bloom harmful algal bloom Karenia mikimotoi Karenia mikimotoi ROS ROS salinity salinity
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| GB/T 7714 | Shi, Xinguo , Zou, Yazhen , Zhang, Yingjiao et al. Salinity decline promotes growth and harmful blooms of a toxic alga by diverting carbon flow [J]. | GLOBAL CHANGE BIOLOGY , 2024 , 30 (6) . |
| MLA | Shi, Xinguo et al. "Salinity decline promotes growth and harmful blooms of a toxic alga by diverting carbon flow" . | GLOBAL CHANGE BIOLOGY 30 . 6 (2024) . |
| APA | Shi, Xinguo , Zou, Yazhen , Zhang, Yingjiao , Ding, Guangmao , Xiao, Yuchun , Lin, Senjie et al. Salinity decline promotes growth and harmful blooms of a toxic alga by diverting carbon flow . | GLOBAL CHANGE BIOLOGY , 2024 , 30 (6) . |
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Algicidal bacteria exhibit promising potential against harmful algal blooms (HABs); however, their application has been limited due to their limited algicidal activity. This study demonstrates the enhanced algicidal activity of Alteromonas sp. FDHY-CJ bacteria against harmful Skeletonema costatum using a 5 L fermenter. Utilizing this refined framework increased the OD600 value and algal cell mortality by 6.50 and 2.88 times, respectively, compared to non-optimized culture cultivated in a flask using marine broth 2216E medium. The mechanism of action involves significant inhibition of algal photosynthetic efficiency with concurrent degradation of photosynthetic pigments. Relative to the non-optimized group, the optimized bacterial treatment led to a significant increase in H2O2 and MDA (malondialdehyde) by 19.54 and 4.22-fold, respectively, and resulted in membrane damage. The culture optimization procedure yielded effectual algicidal substances capable of considerably reducing the severity of S. costatum HABs through cell membrane disruption.
Keyword ：
Algicidal bacteria Algicidal bacteria Culture optimization Culture optimization Fermenter Fermenter Response surface methodology Response surface methodology Skeletonema costatum Skeletonema costatum
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| GB/T 7714 | Lv, Pin , Shi, Xinguo , Wang, Qianqian et al. Boosting algicidal efficiency of Alteromonas sp. FDHY-CJ against Skeletonema costatum through fermentation optimization [J]. | PROTIST , 2023 , 175 (1) . |
| MLA | Lv, Pin et al. "Boosting algicidal efficiency of Alteromonas sp. FDHY-CJ against Skeletonema costatum through fermentation optimization" . | PROTIST 175 . 1 (2023) . |
| APA | Lv, Pin , Shi, Xinguo , Wang, Qianqian , Zhong, Yuying , Guo, Yisong , Chen, Jianfeng . Boosting algicidal efficiency of Alteromonas sp. FDHY-CJ against Skeletonema costatum through fermentation optimization . | PROTIST , 2023 , 175 (1) . |
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本发明公开了一种用于红树植物种植的植生混凝土，由多孔混凝土外框和植被混凝土内核两部分组成。使用时，先将红树植物种苗种植在植被混凝土内核中，再将内核填充到多孔混凝土外框中，以实现红树植物的种植。本发明提供的植生混凝土利用多孔混凝土外框的强度和密度起到减缓海浪潮汐冲刷的作用，且外框较高的孔隙率可有效提高红树植物的透水透气性，而植被混凝土内核具有适宜的强度、密度和孔隙率，不但可防止种植基质流失、助力红树植物固着抗倒伏，而且可大大提高红树植物的透水透气性、存活率和保有率。
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| GB/T 7714 | 石新国 , 陈冬杰 , 陈剑锋 et al. 一种用于红树植物种植的植生混凝土 : CN202211140854.0[P]. | 2022-09-20 00:00:00 . |
| MLA | 石新国 et al. "一种用于红树植物种植的植生混凝土" : CN202211140854.0. | 2022-09-20 00:00:00 . |
| APA | 石新国 , 陈冬杰 , 陈剑锋 , 刘乐冕 , 郭毅松 . 一种用于红树植物种植的植生混凝土 : CN202211140854.0. | 2022-09-20 00:00:00 . |
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本发明公开了一种用于赤潮防控的皂苷基多孔泡沫混凝土，该皂苷基多孔泡沫混凝土是由凝胶材料和泡沫材料组成，其中，所述凝胶材料由水泥与水混合制得，所述泡沫材料是将茶皂素水溶液经发泡制得。本发明所得皂苷基多孔泡沫混凝土具有密度低、孔隙率和吸水率高、孔径和比表面积大等特点，可通过直接吸附赤潮藻或固定化吸附溶藻菌来降低赤潮藻生物量，起到赤潮防控的效果。
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| GB/T 7714 | 陈剑锋 , 吴桐 , 郭毅松 et al. 一种用于赤潮防控的皂苷基多孔泡沫混凝土 : CN202211140853.6[P]. | 2022-09-20 00:00:00 . |
| MLA | 陈剑锋 et al. "一种用于赤潮防控的皂苷基多孔泡沫混凝土" : CN202211140853.6. | 2022-09-20 00:00:00 . |
| APA | 陈剑锋 , 吴桐 , 郭毅松 , 石新国 , 刘乐冕 . 一种用于赤潮防控的皂苷基多孔泡沫混凝土 : CN202211140853.6. | 2022-09-20 00:00:00 . |
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Introduction: Harmful algal blooms (HABs) have been increasing in frequency and expanding their ranges on coastlines worldwide in recent decades. Algicidal bacteria play a pivotal role in eliminating HABs, yet the characteristics of bacterial communities and their algicidal activity during a Karenia longicanalis bloom remain poorly understood.Methods: In this study, we investigated bacterial communities using 16S rRNA sequencing during a K. longicanalis bloom to identify bacteria with high algicidal activity that could be isolated. Five sampling sites in Tongxin Bay, located in Lianjiang County, China, including TX1 to TX5, were selected based on the concentration of K. longicanalis cells.Results: Our 16S rRNA sequencing results revealed that the TX4 site was enriched with genera known to contain algicidal bacteria, such as Pseudoalteromonas and Alteromonas, which are members of the Gammaproteobacteria class, while Sulfitobacter, a member of the Alphaproteobacteria class, was enriched in the TX5 site. Among the 100 cultivable bacteria isolated from the 5 sampling sites, 6 exhibited an algicidal rate of over 80%, with FDHY-MQ5, isolated from the TX4 site, exhibiting an algicidal rate of approximately 100% against Karenia mikimotoi after 48 hours of challenge with 2% (v/v) bacterial volume (OD600=4.5) concentration. Our 16S rRNA sequencing result showed FDHY-MQ5 was a member of the Pseudoalteromonas genus, and this bacterium also demonstrated high algicidal activity against Heterosigma akashiwo and Alexandrium tamarense.Discussion: Our findings shed light on the changes in bacterial community structure and the algicidal behavior of bacteria towards algae during a K. longicanalis bloom, providing a research basis for a better understanding of HAB management.
Keyword ：
algicidal bacterium algicidal bacterium bacterial communities bacterial communities harmful algal bloom harmful algal bloom Karenia longicanalis Karenia longicanalis Karenia mikimotoi Karenia mikimotoi
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| GB/T 7714 | Zhang, Yingjiao , Zhou, Xiaowen , Tang, Weiqi et al. Decoding the influence of bacterial community structure and algicidal bacteria in a Karenia longicanalis bloom event [J]. | FRONTIERS IN MARINE SCIENCE , 2023 , 10 . |
| MLA | Zhang, Yingjiao et al. "Decoding the influence of bacterial community structure and algicidal bacteria in a Karenia longicanalis bloom event" . | FRONTIERS IN MARINE SCIENCE 10 (2023) . |
| APA | Zhang, Yingjiao , Zhou, Xiaowen , Tang, Weiqi , Zhou, Konglin , Wang, Zonghua , Shi, Xinguo . Decoding the influence of bacterial community structure and algicidal bacteria in a Karenia longicanalis bloom event . | FRONTIERS IN MARINE SCIENCE , 2023 , 10 . |
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The role of microorganisms in effectively terminating harmful algal blooms (HABs) is crucial for maintaining environmental stability. Recent studies have placed increased emphasis on bio-agents capable of inhibiting HABs. The bacterium Pseudoalteromonas sp. strain FDHY-MZ2 has exhibited impressive algicidal abilities against Karenia mikimotoi, a notorious global HAB-forming species. To augment this capability, cultures were progressively scaled from shake flask conditions to small-scale (5 L) and pilot-scale (50 L) fermentation. By employing a specifically tailored culture medium (2216E basal medium with 1.5% soluble starch and 0.5% peptone), under precise conditions (66 h, 20 degrees C, 450 rpm, 30 L/min ventilation, 3% seeding, and constant starch flow), a notable increase in algicidal bacterial biomass was observed; the bacterial dosage required to entirely wipe out K. mikimotoi within a day decreased from 1% to 0.025%. Compared to an unoptimized shake flask group, the optimized fermentation culture caused significant reductions in algal chlorophyll and protein levels (21.85% and 78.3%, respectively). Co-culturing induced increases in algal malondialdehyde and H2O2 by 5.98 and 5.38 times, respectively, leading to further disruption of algal photosynthesis. This study underscores the unexplored potential of systematically utilized microbial agents in mitigating HABs, providing a pathway for their wider application.
Keyword ：
algicidal bacteria algicidal bacteria harmful algal blooms (HABs) harmful algal blooms (HABs) Karenia mikimotoi Karenia mikimotoi pilot-scale fermentation optimization pilot-scale fermentation optimization Pseudoalteromonas sp. FDHY-MZ2 Pseudoalteromonas sp. FDHY-MZ2 shake flask fermentation optimization shake flask fermentation optimization
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| GB/T 7714 | Zhong, Yuying , Zheng, Wenhuang , Shi, Xinguo et al. Pilot-Scale Fermentation of Pseudoalteromonas sp. Strain FDHY-MZ2: An Effective Strategy for Increasing Algicidal Activity [J]. | BIOLOGY-BASEL , 2023 , 12 (11) . |
| MLA | Zhong, Yuying et al. "Pilot-Scale Fermentation of Pseudoalteromonas sp. Strain FDHY-MZ2: An Effective Strategy for Increasing Algicidal Activity" . | BIOLOGY-BASEL 12 . 11 (2023) . |
| APA | Zhong, Yuying , Zheng, Wenhuang , Shi, Xinguo , Guo, Yisong , Wang, Qianqian , Lv, Pin et al. Pilot-Scale Fermentation of Pseudoalteromonas sp. Strain FDHY-MZ2: An Effective Strategy for Increasing Algicidal Activity . | BIOLOGY-BASEL , 2023 , 12 (11) . |
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Haematococcus pluvialis is considered as the best source of natural astaxanthin, while its application is limited due to the high production cost. Exploring cost-effective culture systems can be an efficient way to improve economic feasibility. In this study, it was found that biomass concentration and astaxanthin content of H. pluvialis QLD with ammonium as nitrogen source and pH control were similar to the treatment with nitrate as nitrogen source, indicating that the low-cost ammonium can be appropriately utilized when pH is well controlled. Subsequently, the concentration of CO2 was optimized, and 1% CO2 was found to be desirable for cell growth and astaxanthin accumulation. Further, a pH steady NaHCO3-CO2-C/NH4Cl-N culture system was explored to improve cell growth and astaxanthin production in H. pluvialis QLD. The results showed that pH was stabilized at 7 to 8 with enhanced biomass concentration and astaxanthin content under a bicarbonate-C/ammonium-N ratio of 2.5:1 and 1% CO2. Besides, optimal ammonium concentration was assessed, and maximal biomass concentration was obtained at 4.50 mM NH4Cl. Moreover, light intensity was optimized to enhance astaxanthin production in the culture system. Maximal biomass concentration (3.77 g/L), astaxanthin content (56.87 mg/g), astaxanthin production (216.56 mg/L), and astaxanthin productivity (12.63 mg/L/d) were obtained under a light intensity of 480 mu mol/m2/s. The performance of this study was greater than most reports under phototrophic batch cultivation, indicating that the NaHCO3-CO2-C/NH4Cl-N culture system is promising for cost-effective astaxanthin production.
Keyword ：
Ammonium Ammonium Astaxanthin Astaxanthin Bicarbonate Bicarbonate CO 2 CO 2 Haematococcus pluvialis Haematococcus pluvialis
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| GB/T 7714 | Ma, Ruijuan , Tao, Xinyi , Chua, Elvis T. et al. Enhancing astaxanthin production in Haematococcus pluvialis QLD by a pH steady NaHCO3-CO2-C/NH 4Cl-N culture system [J]. | ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS , 2022 , 64 . |
| MLA | Ma, Ruijuan et al. "Enhancing astaxanthin production in Haematococcus pluvialis QLD by a pH steady NaHCO3-CO2-C/NH 4Cl-N culture system" . | ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS 64 (2022) . |
| APA | Ma, Ruijuan , Tao, Xinyi , Chua, Elvis T. , Ho, Shih-Hsin , Shi, Xinguo , Liu, Lemian et al. Enhancing astaxanthin production in Haematococcus pluvialis QLD by a pH steady NaHCO3-CO2-C/NH 4Cl-N culture system . | ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS , 2022 , 64 . |
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K. mikimotoi is a noxious algal bloom-forming species that cause damaging of the aquaculture industry and great financial losses. Bacterium with algicidal activity is an ideal agency to inhibit the growth of harmful algae. The toxic dinoflagellate Karenia mikimotoi is a harmful algal bloom-forming species in coastal areas around the world. It produces ichthyotoxins and hemolytic toxins, with deleterious effects on marine ecosystems. In this study, the bacterium Pseudoalteromonas sp. FDHY-MZ2, with high algicidal efficiency against K. mikimotoi, was isolated from a bloom event. Based on the results, it completely lysed K. mikimotoi cells within 24 h 0.5% (vol/vol), with the algicidal activity of the supernatant of the bacterium culture. Algal cell wall fragmentation occurred, leading to cell death. There was a marked decline in various photochemical traits. When treated with the supernatant, cellulase, pheophorbide a oxygenase (PAO) and cyclin B genes were significantly increased, suggesting induced cell wall deterioration, chloroplast degradation and cell cycle regulation of K. mikimotoi cells. In addition, the expression levels of reactive oxygen species (ROS) scavenging gene was significantly inhibited, indicating that the ROS removal system was damaged. The bacterial culture was dried to obtain the spray-dried powder, which showed algicidal activity rates of 92.2 and 100% against a laboratory K. mikimotoi culture and a field microcosm of Karlodinium sp. bloom within 24 h with the addition of 0.04% mass fraction powder. Our results demonstrate that FDHY-MZ2 is a suitable strain for K. mikimotoi and Karlodinium sp. blooms management. In addition, this study provides a new strategy for the anthropogenic control of harmful algal bloom-forming species in situ. IMPORTANCE K. mikimotoi is a noxious algal bloom-forming species that cause damaging of the aquaculture industry and great financial losses. Bacterium with algicidal activity is an ideal agency to inhibit the growth of harmful algae. In this approach application, the bacterium with high algicidal activity is required and the final management material is ideal for easy-to-use. The algicidal characteristics are also needed to understand the effects of the bacterium for managing strategy exploration. In this study, we isolated a novel algicidal bacterium with extremely high lysis efficiency for K. mikimotoi. The algicidal characteristics of the bacterium as well as the chemical and molecular response of K. mikimotoi with the strain challenge were examined. Finally, the algicidal powder was explored for application. The results demonstrate that FDHY-MZ2 is suitable for K. mikimotoi and Karlodinium sp. blooms controlling, and this study provides a new strategy for algicidal bacterium application.
Keyword ：
algicidal bacterium algicidal bacterium dinoflagellate dinoflagellate harmful algal bloom harmful algal bloom Karenia mikimotoi Karenia mikimotoi
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| GB/T 7714 | Shi, Xinguo , Zou, Yazhen , Zheng, Wenhuang et al. A Novel Algicidal Bacterium and Its Effects against the Toxic Dinoflagellate Karenia mikimotoi (Dinophyceae) [J]. | MICROBIOLOGY SPECTRUM , 2022 , 10 (3) . |
| MLA | Shi, Xinguo et al. "A Novel Algicidal Bacterium and Its Effects against the Toxic Dinoflagellate Karenia mikimotoi (Dinophyceae)" . | MICROBIOLOGY SPECTRUM 10 . 3 (2022) . |
| APA | Shi, Xinguo , Zou, Yazhen , Zheng, Wenhuang , Liu, Lemian , Xie, Youping , Ma, Ruijuan et al. A Novel Algicidal Bacterium and Its Effects against the Toxic Dinoflagellate Karenia mikimotoi (Dinophyceae) . | MICROBIOLOGY SPECTRUM , 2022 , 10 (3) . |
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Prorocentrum donghaiense is a harmful-algal-bloom-forming species of planktonic dinoflagellates widely distributed around the world, which threatens the marine environment and human health. Bacteria are promising biological agents to control algal growth in HABs. Previously, we isolated an Alteromonas sp. FDHY-03, a P. donghaiense-lysing bacteria strain, from Xiapu Sea area of China. In order to improve the algicidal activity of this strain, we optimized the medium composition and culture conditions. Based on single-factor method experiment design, the optimum medium component of algicidal effect for strain FDHY-03 was sucrose and peptone. The result of Plackett-Burman design indicated that three significant factors (sucrose, peptone, and rotational speed) appeared. Finally, the concentrations of key factors were confirmed by central composite design (CCD) and response surface methodology (RSM). Under the optimized medium, the algicidal rate of strain FDHY-03 against P. donghaiense improved by 67.15%, and the OD(600 )value increased by 2.86-fold. The optimal source and condition were sucrose 0.46% (w/v), peptone 4.25% (w/v) addition, and rotation speed 255 rpm. Overall, this study provides an optimized method and optimum medium for improving the algicidal activity against P. donghaiense, and has a positive influence on algae-lysing bacteria for controlling the blooms of the algae in the environment.
Keyword ：
Alteromonas sp. FDHY-03 Alteromonas sp. FDHY-03 central composite design central composite design response surface methodology response surface methodology single-factor design single-factor design
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| GB/T 7714 | Wang, Qianqian , Shi, Xinguo , Guo, Yisong et al. Optimization of Algicidal Activity for Alteromonas sp. FDHY-03 against Harmful Dinoflagellate Prorocentrum donghaiense [J]. | JOURNAL OF MARINE SCIENCE AND ENGINEERING , 2022 , 10 (9) . |
| MLA | Wang, Qianqian et al. "Optimization of Algicidal Activity for Alteromonas sp. FDHY-03 against Harmful Dinoflagellate Prorocentrum donghaiense" . | JOURNAL OF MARINE SCIENCE AND ENGINEERING 10 . 9 (2022) . |
| APA | Wang, Qianqian , Shi, Xinguo , Guo, Yisong , Lv, Pin , Zhong, Yuying , Xie, Hui et al. Optimization of Algicidal Activity for Alteromonas sp. FDHY-03 against Harmful Dinoflagellate Prorocentrum donghaiense . | JOURNAL OF MARINE SCIENCE AND ENGINEERING , 2022 , 10 (9) . |
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