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Article: Two new diatom species of the genus

Li, Lang / Nong, Qun-Zhuan / Chen, Chang-Ping / Li, Yu-Hang / Lai, Jun-Xiang

2024 Volume 239, Page(s) 255–266

Abstract: Two new diatom species belonging to the ... ...

Abstract	Two new diatom species belonging to the genus
Language	English
Publishing date	2024-03-26
Publishing country	Bulgaria
Document type	Journal Article
ZDB-ID	2579891-1
ISSN	1314-2003 ; 1314-2011
ISSN (online)	1314-2003
ISSN	1314-2011
DOI	10.3897/phytokeys.239.114018
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Article ; Online: The allelopathic potential of red macroalga Pyropia haitanensis solvent extracts on controlling bloom-forming microalgae: Insights into the inhibitory compounds.

Patil, Vishal / Huang, Lu / Liang, Junrong / Sun, Lin / Wang, Dazhi / Gao, Yahui / Chen, Changping

Ecotoxicology and environmental safety

2024 Volume 272, Page(s) 116083

Abstract: Various strategies have been explored to mitigate the impact of harmful algal blooms (HABs). While chemical and physical methods have traditionally been employed to regulate microalgal growth, their prolonged adverse effects on the ecosystem are a cause ... ...

Abstract	Various strategies have been explored to mitigate the impact of harmful algal blooms (HABs). While chemical and physical methods have traditionally been employed to regulate microalgal growth, their prolonged adverse effects on the ecosystem are a cause for concern. Recognizing the integral role of macroalgae within the ecosystem, this study reveals the anti-algal properties of solvent-based extracts derived from the red macroalga Pyropia haitanensis as a means of preventing microalgal blooms. In our investigation, we initially assessed the growth-inhibitory effects of methanol and acetone extracts from P. haitanensis on five microalgae known to contribute to bloom-formation. Significantly reduced growth was observed in all microalgal species when inoculated with both methanol and acetone extracts. Further analysis revealed the effectiveness of the methanol extract (ME), and further fractionation with petroleum ether (PE), ethyl acetate (EA), and n-butanol (NB) for testing against Skeletonema costatum and Pseudo-nitzschia pungens. The methanol fractions exhibited strong inhibition, resulting in the complete elimination of both microalgae after 96 hours of exposure to PE, EA, and NB extracts. Gas Chromatography-Mass Spectroscopy (GC-MS) analysis of the ME and its solvent fractions identified 49 confirmed compounds. These compounds are likely potential contributors to the observed inhibition of microalgal growth. In conclusion, our findings suggest that solvent extracts from P. haitanensis possess substantial potential for the control of HABs, offering a promising avenue for further research and application in ecosystem management.
MeSH term(s)	Seaweed ; Microalgae ; Solvents ; Ecosystem ; Methanol ; Acetone ; Rhodophyta ; Harmful Algal Bloom
Chemical Substances	Solvents ; Methanol (Y4S76JWI15) ; Acetone (1364PS73AF)
Language	English
Publishing date	2024-02-13
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	436536-7
ISSN	1090-2414 ; 0147-6513
ISSN (online)	1090-2414
ISSN	0147-6513
DOI	10.1016/j.ecoenv.2024.116083
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Article ; Online: Performance management algorithm of financial shared service center based on Internet of Things public cloud privacy protection.

Yu, Zhen / Lin, Sheng-Huang / Cho, Chia-Ching / Chen, Changping

Mathematical biosciences and engineering : MBE

2023 Volume 20, Issue 7, Page(s) 12510–12528

Abstract: The Internet of Things (IoT) refers to the use of various communication technologies to achieve the interconnection of everything in cyberspace, and to achieve smart home and intelligent transportation, thus generating unprecedented amounts of data. In ... ...

Abstract	The Internet of Things (IoT) refers to the use of various communication technologies to achieve the interconnection of everything in cyberspace, and to achieve smart home and intelligent transportation, thus generating unprecedented amounts of data. In the financial sharing center, all businesses can extract effective data from these massive databases for analysis, and use data analysis tools to collect business, financial, human, process, knowledge and social data. At present, various types of IT (Internet Technology) systems have been widely used in financial sharing centers. However, a large number of sensitive data have also been generated. In order to protect these sensitive data, there is a high requirement for the personal information of IT system operation and financial sharing center personnel. In order to protect user data privacy, the optimal and most effective use of IT systems is an important issue that must be considered in privacy management. At present, there are many algorithms to protect data and privacy, but the effect is not ideal. Considering the balance between privacy issues, this paper proposed a K-means clustering algorithm based on IoT public cloud privacy protection technology to analyze the performance management of financial sharing center. The research results showed that before the improvement, the average number of employees who were dissatisfied with the post training ability and information platform construction ability of the financial sharing center was 57.9 and 57.8% respectively, more than half of them. After the improvement of IoT based public cloud privacy protection, the average number of employees dissatisfied with the post training ability and information platform construction ability of the financial sharing center was 5 and 3.9%, far less than the data prior to the improvement. It showed that IoT public cloud privacy protection was conducive to the performance management of the financial sharing center, and the relationship between the two was positive.
Language	English
Publishing date	2023-07-27
Publishing country	United States
Document type	Journal Article
ZDB-ID	2265126-3
ISSN	1551-0018 ; 1551-0018
ISSN (online)	1551-0018
ISSN	1551-0018
DOI	10.3934/mbe.2023557
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Article ; Online: Ion fluxes Involved in the Adaptation of the Estuarine Diatom

Chen, Changping / Hu, Xiao / Gao, Yahui / Liang, Junrong / Sun, Lin

International journal of molecular sciences

2023 Volume 24, Issue 18

Abstract: Although estuarine diatoms have a wide range of salt tolerance, they are often severely stressed by elevated salt concentrations. It remains poorly understood how estuarine diatoms maintain ionic homeostasis under high-salinity conditions. Using a ... ...

Abstract	Although estuarine diatoms have a wide range of salt tolerance, they are often severely stressed by elevated salt concentrations. It remains poorly understood how estuarine diatoms maintain ionic homeostasis under high-salinity conditions. Using a scanning ion-selective electrode technique, this study determined the fluxes of H
Language	English
Publishing date	2023-09-05
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2019364-6
ISSN	1422-0067 ; 1422-0067 ; 1661-6596
ISSN (online)	1422-0067
ISSN	1422-0067 ; 1661-6596
DOI	10.3390/ijms241813683
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Article ; Online: Relationship between toxic and harmful microalgae and environmental factors in typical mariculture areas of East China Sea

Zhang, Anqi / Liu, Honghan / Li, Chenhong / Chen, Changping / Liang, Junrong / Sun, Lin / Gao, Yahui

J. Ocean. Limnol.. 2022 Nov., v. 40, no. 6 p.2401-2415

2022

Abstract: Toxic and harmful algal blooms are usually more frequent in mariculture areas due to the abundant trophic conditions. To investigate the relationship between toxic and harmful microalgae and environmental factors, we set up 12 stations near three ... ...

Abstract	Toxic and harmful algal blooms are usually more frequent in mariculture areas due to the abundant trophic conditions. To investigate the relationship between toxic and harmful microalgae and environmental factors, we set up 12 stations near three mariculture regions (Gouqi Island, Sandu Bay, and Dongshan Bay) in the East China Sea. We collected samples from all four seasons starting from May 2020 to March 2021. We identified 199 species belonging to 70 genera, of which 38 species were toxic and harmful, including 24 species of Dinophyceae, 13 species of Bacillariophyceae, and 1 species of Raphidophyceae. The species composition of toxic and harmful microalgae showed a predominance of diatoms in the summer (August), and dinoflagellates in the spring (May), autumn (November), and winter (March). The cell densities of toxic and harmful microalgae were higher in summer (with an average value of 15.34×10³ cells/L) than in other seasons, 3.53×10³ cells/L in spring, 1.82×10³ cells/L in winter, and 1.0×10³ cells/L in autumn. Pseudonitzschia pungens, Prorocentrum minimum, Paralia sulcata, and Prorocentrum micans were the dominant species and were available at all 12 stations in the three mariculture areas. We selected 10 toxic and harmful microalgal species with frequency >6 at the survey stations for the redundancy analysis (RDA), and the results show that NO ₃⁻ , water temperature (WT), pH, DO, and NO ₂⁻ were the main factors on distribution of toxic and harmful microalgae. We concluded that the rich nutrient conditions in the East China Sea mariculture areas increased the potential for the risk of toxic and harmful microalgal bloom outbreaks.
Keywords	Paralia ; Prorocentrum ; Pseudo-nitzschia ; Raphidophyceae ; autumn ; dominant species ; mariculture ; microalgae ; pH ; poisonous algae ; risk ; species diversity ; spring ; summer ; surveys ; toxicity ; water temperature ; winter ; East China Sea
Language	English
Dates of publication	2022-11
Size	p. 2401-2415.
Publishing place	Science Press
Document type	Article ; Online
ISSN	2096-5508
DOI	10.1007/s00343-022-2125-y
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Article ; Online: Evaluation of electrode-sample contact impedance under different curing humidity conditions during measurement of AC impedance of cement-based materials.

Wang, Ruipan / He, Fuqiang / Chen, Changping / Dai, Lizong

Scientific reports

2020 Volume 10, Issue 1, Page(s) 17968

Abstract: In this study, a simple method was proposed to calculate electrode-sample contact impedance in the cases of two-point and four-point measurements. The results indicated that when using the saturated calcium hydroxide solution (SCH) as conductive medium, ... ...

Abstract	In this study, a simple method was proposed to calculate electrode-sample contact impedance in the cases of two-point and four-point measurements. The results indicated that when using the saturated calcium hydroxide solution (SCH) as conductive medium, the contact impedance in the four-point measurement is negligible for the impedance range of cement-based materials. The SCH can be used as a reference for correction of the contact impedance. A reasonable combination of curing humidity and different conductive media is recommended for the two-point measurement, which is suitable for testing the ACIS of cement-based materials. In a case of contact impedance not being precisely known, it is highly recommended that a four-point measurement with two different ratios of the length of the sample and the center spacing of the voltage electrodes (L/a) should be conducted to evaluate the effect of the contact impedance following the procedure proposed in this study.
Language	English
Publishing date	2020-10-21
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-020-74925-w
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Article ; Online: Resting cell formation in the marine diatom Thalassiosira pseudonana.

Wang, Guangning / Huang, Lu / Zhuang, Shanshan / Han, Fang / Huang, Qianqian / Hao, Mengyuan / Lin, Guifang / Chen, Longnan / Shen, Biying / Li, Feng / Li, Xuesong / Chen, Changping / Gao, Yahui / Mock, Thomas / Liang, Junrong

The New phytologist

2024

Abstract: Resting cells represent a survival strategy employed by diatoms to endure prolonged periods of unfavourable conditions. In the oceans, many diatoms sink at the end of their blooming season and therefore need to endure cold and dark conditions in the ... ...

Abstract	Resting cells represent a survival strategy employed by diatoms to endure prolonged periods of unfavourable conditions. In the oceans, many diatoms sink at the end of their blooming season and therefore need to endure cold and dark conditions in the deeper layers of the water column. How they survive these conditions is largely unknown. We conducted an integrative analysis encompassing methods from histology, physiology, biochemistry, and genetics to reveal the biological mechanism of resting-cell formation in the model diatom Thalassiosira pseudonana. Resting-cell formation was triggered by a decrease in light and temperature with subsequent catabolism of storage compounds. Resting cells were characterised by an acidic and viscous cytoplasm and altered morphology of the chloroplast ultrastructure. The formation of resting cells in T. pseudonana is an energy demanding process required for a biophysical alteration of the cytosol and chloroplasts to endure the unfavourable conditions of the deeper ocean as photosynthetic organisms. However, most resting cells (> 90%) germinate upon return to favorable growth conditions.
Language	English
Publishing date	2024-02-25
Publishing country	England
Document type	Journal Article
ZDB-ID	208885-x
ISSN	1469-8137 ; 0028-646X
ISSN (online)	1469-8137
ISSN	0028-646X
DOI	10.1111/nph.19646
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Article: Morphology and distribution of the marine diatom Azpeitia africana (Janisch ex A. Schmidt) G. Fryxell & T. P. Watkins in the South China Sea

Wu, Rui / Chen, Changping / Chen, Dandan / Gao, Yu

Journal of oceanology and limnology. 2019 Jan., v. 37, no. 1

2019

Abstract: The purpose of the present paper is to study the morphological structure and variability of Azpeitia africana and to determine its geographical distribution in the surface sediments of the South China Sea (SCS). Sediment samples were collected with grabs ...

Abstract	The purpose of the present paper is to study the morphological structure and variability of Azpeitia africana and to determine its geographical distribution in the surface sediments of the South China Sea (SCS). Sediment samples were collected with grabs or box corers in one cruise in 2001 and two cruises in 2007. The sampling stations were located between 3°56.61′–20°59.37′N and 108°30.68′–116°46.70′E, where the water depth ranged from 72 m to 4 238 m. The diatom was observed by phase contrast microscopy and scanning electron microscopy. Microscopical observation showed that A. africana had circular valves with the areolar lines radiating from the eccentric ring. The central rimoportula had an external tube recessed on the edge of a central ring. The marginal rimoportulae were not evenly spaced, and they were positioned more closely together in one quadrant than in the others. Azpeitia africana is the most abundant diatom species in the southern region of the SCS, and accounted for 0.9%–5.6% of all diatom species in the Xisha Islands area. Average cell density of A. africana was 1.1×105 valves/g. The percentage abundance of A. africana was low (0%–2.5%) in the northern regions of the SCS and the Sunda Shelf, and it was not detected in the northwestern continental shelf (shallow water area) and northern Kalimantan Island shelf. Our results suggested that A. africana is a typical warm water species and that it could be used as an indicator of the warm Pacific Ocean water, including the Kuroshio Current, flowing into the SCS.
Keywords	Bacillariophyceae ; continental shelf ; geographical distribution ; islands ; phase-contrast microscopy ; scanning electron microscopy ; seawater ; sediments ; Borneo ; Pacific Ocean ; South China Sea
Language	English
Dates of publication	2019-01
Size	p. 102-111.
Publishing place	Science Press
Document type	Article
ISSN	2096-5508
DOI	10.1007/s00343-019-7248-4
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Article ; Online: Responses of phytoplankton and its satellite bacteria to exogenous ethanol

Abate, Rediat / Hetharua, Buce Hanoch / Patil, Vishal / Lin, Daner / Kifle, Demeke / Liang, Junrong / Chen, Changping / Sun, Lin / Kao, Shuh-Ji / Bi, Yonghong / Huang, Bangqin / Gao, Yahui

J. Ocean. Limnol.. 2023 Jan., v. 41, no. 1 p.203-214

2023

Abstract: The response of phytoplankton and its satellite bacteria to various concentrations (0.01%–10% v/v) of ethanol is studied. To elucidate the effect of ethanol, single-strains of phytoplankton (SSP) culture, pure strains of satellite bacteria isolated from ... ...

Abstract	The response of phytoplankton and its satellite bacteria to various concentrations (0.01%–10% v/v) of ethanol is studied. To elucidate the effect of ethanol, single-strains of phytoplankton (SSP) culture, pure strains of satellite bacteria isolated from nonaxenic SSP cultures, and Escherichia coli were screened. Results indicate that ethanol could promote the growth and photosynthetic efficiency (Fᵥ/Fₘ) of SSP at 0.01% and the growth of satellite bacteria at 0.01%–1%. Nevertheless, ethanol inhibited the growth and Fᵥ/Fₘ of SSP at 0.1%–1%, and killed bacteria and SSP at 10% concentration. Further investigation on a satellite bacterium (Mameliella alba) revealed that ethanol promotes growth by serving as a growth stimulant rather than a metabolic carbon source. The 16S rRNA gene amplicon indicated that all nonaxenic SSP cultures harbor distinct satellite bacteria communities where the SSP culture of Skeletonema costatum, Phaeodactylum tricornutum, and Dunaliella bardawil were dominated by bacteria genera of Marivita (∼80%), Dinoroseobacter (∼47%), and Halomonas (∼87%), respectively, indicating that every SSP cultures have their own distinct satellite bacterial community. The bacteria family Rhodobacteraceae was dominant in the two marine diatoms, whereas Halomonadaceae was dominant in the saline green microalga. Compared to their respective controls, the supply of 0.5% ethanol to SSP cultures promoted the growth of the satellite bacteria but did not cause a significant difference in species composition of satellite bacteria. Therefore, a low concentration of ethanol can promote the growth of bacteria in a non-selective way. This study enriched our knowledge about the effect of ethanol on aquatic microbes and provided a baseline for basic and applied biotechnological research in the aquatic environment in the future.
Keywords	Dunaliella bardawil ; Escherichia coli ; Halomonas ; Phaeodactylum tricornutum ; Rhodobacteraceae ; Skeletonema costatum ; aquatic environment ; bacteria ; bacterial communities ; carbon ; ethanol ; genes ; microalgae ; photosynthesis ; phytoplankton ; satellites ; species diversity
Language	English
Dates of publication	2023-01
Size	p. 203-214.
Publishing place	Science Press
Document type	Article ; Online
ISSN	2096-5508
DOI	10.1007/s00343-021-1224-5
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Article ; Online: N

Chen, Shu-Jie / Li, Jia-Hui / He, Zhi-Qing / Chen, Guo-Shu / Zhuang, Yin-Yin / Chen, Chang-Ping / Liu, Yun-Lin

The Journal of organic chemistry

2022 Volume 87, Issue 22, Page(s) 15703–15712

Abstract: Installing a fluoroalkyl group onto the nitrogen atom of azoles represents a potential strategy for lead optimization in medicinal chemistry. Herein, we describe a method for ... ...

Abstract	Installing a fluoroalkyl group onto the nitrogen atom of azoles represents a potential strategy for lead optimization in medicinal chemistry. Herein, we describe a method for the
MeSH term(s)	Azoles/chemistry ; Hydrogenation ; Catalysis ; Nitrogen
Chemical Substances	Azoles ; Nitrogen (N762921K75)
Language	English
Publishing date	2022-11-04
Publishing country	United States
Document type	Journal Article
ZDB-ID	123490-0
ISSN	1520-6904 ; 0022-3263
ISSN (online)	1520-6904
ISSN	0022-3263
DOI	10.1021/acs.joc.2c02323
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