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Thesis ; Online: From plastic mulching to microplastic pollution

Meng, Fanrong

An effect assessment of microplastics in the soil-plant system

2021

Abstract: Plastic debris originating from mulching films has made a significant contribution to agricultural microplastic pollution. However, the accumulation of plastic residues and the occurrence of microplastics in agricultural fields are missing. Biodegradable ...

Abstract	Plastic debris originating from mulching films has made a significant contribution to agricultural microplastic pollution. However, the accumulation of plastic residues and the occurrence of microplastics in agricultural fields are missing. Biodegradable were introduced to agricultural systems due to its biodegradability. However, fully biodegradation under in-situ conditions have rarely been observed. Instead, biodegradable materials tend to break down into small bio-plastic fragments and microplastics. Worryingly, the ecological effects of LDPE and biodegradable microplastics in soil-plant systems remains largely unknown. For this reason, this PhD thesis aims to fill some knowledge gaps concerning the effects of plastic mulching and microplastic pollution on terrestrial ecosystems. To achieve this, a field observation, and a net house mesocosm experiment were carried out.In Chapter 2, a field observation was conducted in Northwestern China. We selected two regions with a long history of plastic mulching use but with two different farming systems. The first study region (S1) was characterized by small scale farmlands and low intensity machinery use. The second study region (S2) was characterized by large scale farmlands and high intensity machinery use. Plastic residues were collected from the top 0-30 cm of soil. Our results showed that in S1, fields with 6-8 years continuous plastic mulching accumulated significantly higher amounts of macroplastics than fields with 30 years intermittent plastic mulching. In S1, macroplastics in the 10–50 cm2 size category accounted for over 40% of the collected macroplastics, followed by macroplastics from 2–10 cm2 which accounted for over 30%. In S2, the collected macroplastics were mainly from the size category 0.25–2 cm2 (40.6%) and 2–10 cm2 (41.1%). Comparing the two study regions, macroplastics were more fragmented in S2 than in S1. This result was in line with the occurrence of microplastics in the two study regions. In S1, microplastics were only detected in fields ...
Keywords	Life Science
Subject code	580
Language	English
Publisher	Wageningen University
Publishing country	nl
Document type	Thesis ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The value evaluation model design and business innovation for P-RAN based on multi-party interaction.

Meng, Fanrong / Liu, Hua / Li, Weimin / Chen, Xin

Scientific reports

2023 Volume 13, Issue 1, Page(s) 4142

Abstract: This paper takes the P-RAN, a proximity wireless access network system for 5G and 6G, as an example, and uses the theory related to value evaluation to discuss how to realize the decentralization of underlying infrastructure from the perspective of ... ...

Abstract	This paper takes the P-RAN, a proximity wireless access network system for 5G and 6G, as an example, and uses the theory related to value evaluation to discuss how to realize the decentralization of underlying infrastructure from the perspective of different interactive players in the system. The analysis of P-RAN helps to promote mobile network operators to recognize network interaction and solve the problems of weak coverage, reduce the cost of network construction, and provides a new research idea for exploring more network evaluation indicators in the future.
Language	English
Publishing date	2023-03-13
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/s41598-023-30602-2
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Effect of different polymers of microplastics on soil organic carbon and nitrogen – A mesocosm experiment

Meng, Fanrong / Yang, Xiaomei / Riksen, Michel / Geissen, Violette

Environmental research. 2022 Mar., v. 204

2022

Abstract: Agricultural microplastic pollution has become a growing concern. Unfortunately, the impacts of microplastics (MPs) on agricultural soil carbon and nitrogen dynamics have not been sufficiently reported. In an attempt to remedy this, we conducted a 105- ... ...

Abstract	Agricultural microplastic pollution has become a growing concern. Unfortunately, the impacts of microplastics (MPs) on agricultural soil carbon and nitrogen dynamics have not been sufficiently reported. In an attempt to remedy this, we conducted a 105-day out-door mesocosm experiment in a soil-plant system using sandy soils amended with two types of MPs, low-density polyethylene (LDPE-MPs) and biodegradable (Bio-MPs), at concentrations of 0.0% (control), 0.5%, 1.0%, 1.5%, 2.0% and 2.5% (w/w, weight ratio of microplastics to air-dry soil). Soil organic matter (SOM), dissolved organic carbon (DOC), permanganate oxidizable carbon (POXC), available nitrogen (AN) of N-NH4+ and N-NO3−, and dissolved organic nitrogen (DON) were measured on day 46 (D46) and 105 (D105) of the experiment. SOM was also measured after microplastics were mixed into soils (D0). For LDPE-MPs treatments, SOM on D0, D46 and D105 showed no significant differences, while for Bio-MPs treatments, SOM significantly (p < 0.05) decreased from D0 to D46. Compared to the control, soil POXC was significantly (p = 0.001) lowered by 0.5%, 1.0% and 2.5% LDPE-MPs and ≥ 1.0% Bio-MPs on D105. LDPE-MPs showed no significant effects on soil DOC and nitrogen cycling. 2.0% and 2.5% Bio-MPs showed significantly higher (p < 0.001) DOC and DON (on D46 and D105) and ≥1.5% Bio-MPs showed significantly lower (p = 0.02) AN (on D46). Overall, Bio-MPs exerted stronger effects on the dynamics of soil carbon and nitrogen cycling. In conclusion, microplastics might pose serious threats to agroecosystems and further research is needed.
Keywords	agricultural soils ; agroecosystems ; biodegradability ; microplastics ; pollution ; polyethylene ; research ; soil organic carbon
Language	English
Dates of publication	2022-03
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	205699-9
ISSN	1096-0953 ; 0013-9351
ISSN (online)	1096-0953
ISSN	0013-9351
DOI	10.1016/j.envres.2021.111938
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Carotenoid-mediated regulation of photosynthetic performance and antioxidant defense confer tolerance to perfluorooctanoic acid stress in Nicotiana tabacum

Li, Xiaozhou / Fu, Wenting / Meng, Fanrong / Guan, Chunfeng

Plant Growth Regul. 2022 Nov., v. 98, no. 2 p.307-319

2022

Abstract: Perfluorooctanoic acid (PFOA) is a typical persistent organic pollutant in soil ecosystem that can cause toxicity to plants. Carotenoids are the most common pigments in nature, which play major roles in the protection of plants against oxidative stress. ... ...

Abstract	Perfluorooctanoic acid (PFOA) is a typical persistent organic pollutant in soil ecosystem that can cause toxicity to plants. Carotenoids are the most common pigments in nature, which play major roles in the protection of plants against oxidative stress. However, whether carotenoids participate in the amelioration of PFOA-caused oxidative stress in plants has not been reported yet. Therefore, the potential moderating roles of carotenoids on tobacco exposed to PFOA stress were estimated in this study through exogenous application of β-carotene (one kind of carotenoids) and enhancement of endogenous carotenoids by overexpression of a phytoene dehydrogenase (PDS) gene in plants. The results showed that PFOA exposure exerted a significant inhibitory effect on tobacco growth. Exogenous application of β-carotene induced resistance of tobacco to PFOA stress, which was reflected by the increase of germination ratio, chlorophyll content and fresh weight of plant. Moreover, LcPDS overexpression significantly increased the carotenoid content, enhanced photosynthetic performance, and reduced oxidative stress in tobacco exposed to PFOA treatment. The above results suggested that exogenous and endogenous carotenoids might all act as a positive regulatory role in plant response to PFOA stress. This study improved our understanding of the probable mechanisms of carotenoids-induced amelioration of PFOA toxicity in tobacco, which might also provide theoretical support for the potential application of carotenoids to enhance the resistance of plants against PFOA stress.
Keywords	Nicotiana tabacum ; antioxidant activity ; carotenoids ; chlorophyll ; genes ; germination ; oxidative stress ; oxidoreductases ; perfluorooctanoic acid ; persistent organic pollutants ; photosynthesis ; plant growth ; plant response ; soil ecosystems ; tobacco ; toxicity
Language	English
Dates of publication	2022-11
Size	p. 307-319.
Publishing place	Springer Netherlands
Document type	Article ; Online
ZDB-ID	843025-1
ISSN	1573-5087 ; 0167-6903
ISSN (online)	1573-5087
ISSN	0167-6903
DOI	10.1007/s10725-022-00856-3
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Article ; Online: Analysis of pncA gene expression in pyrazinamide-resistant and multidrug-resistant Mycobacterium tuberculosis

Wang Nan，, Yang Yu / Deng Ling / Wu Hui / Liu Zhihui / Meng Fanrong

Xin yixue, Vol 54, Iss 12, Pp 879-

2023 Volume 883

Abstract: Objective To compare the expression levels of pncA gene in pyrazinamide （PZA）-resistant and multidrug-resistant Mycobacterium tuberculosis before and after PZA drug stimulation， and to explore the relationship between PZA-resistant Mycobacterium ... ...

Abstract	Objective To compare the expression levels of pncA gene in pyrazinamide （PZA）-resistant and multidrug-resistant Mycobacterium tuberculosis before and after PZA drug stimulation， and to explore the relationship between PZA-resistant Mycobacterium tuberculosis and pncA gene expression. Methods PZA-resistant and multidrug-resistant Mycobacterium tuberculosis was cultured， and the minimal inhibitory concentration （MIC） of rifampicin and PZA was detected. The strains were cultured in medium containing 0 and 50 μg/mL PZA， and the expression level of pncA was detected by real-time fluorescence quantitative PCR. Results The MIC of PZA of 21 strains of Mycobacterium tuberculosis was ≥ 1 600 μg/mL，400-800 μg/mL for 12 strains， and 100-200 μg/mL in 5 strains，and their corresponding PZA resistance levels were defined as high，medium and low，respectively. The median MIC of rifampicin was 128， 128 and 64μg/mL， respectively. Chi-square test showed that there was no significant difference between any two groups （all P > 0.05）. According to the relative quantitative 2 -ΔΔCt method， the expression levels of pncA in the high，medium and low levels of PZA drug-resistant Mycobacterium tuberculosis was 0.904（0.202， 2.653）， 1.157（0.658， 1.511） and 1.147（0.372， 1.347）， and 1.544（0.611， 3.191）， 0.846（0.421， 1.237） and 0.726 （0.225， 3.017） in the 50 μg/mL treatment group，respectively. There was no significant difference in pncA gene expression between the control and PZA drug-containing culture groups（P > 0.05）. Conclusion No significant changes are observed in the expression levels of pncA in multidrug-resistant and PZA-resistant Mycobacterium tuberculosis before and after PZA drug stimulation.
Keywords	mycobacterium tuberculosis\|drug resistance\|pyrazinamide\|rifampicin\|pnca ; Medicine ; R
Subject code	572
Language	Chinese
Publishing date	2023-12-01T00:00:00Z
Publisher	Editorial Office of Journal of New Medicine
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Effects of microplastics on common bean rhizosphere bacterial communities

Meng, Fanrong / Harkes, Paula / van Steenbrugge, Joris J.M. / Geissen, Violette

Applied Soil Ecology. 2023 Jan., v. 181 p.104649-

2023

Abstract: Microplastic pollution in terrestrial ecosystems is a growing concern due to its potential influences on soil properties and crop growth. Little is known about the effects of microplastics on the microbiome in the rhizosphere. Here, we studied the ... ...

Abstract	Microplastic pollution in terrestrial ecosystems is a growing concern due to its potential influences on soil properties and crop growth. Little is known about the effects of microplastics on the microbiome in the rhizosphere. Here, we studied the effects of two types of microplastics (MPs), low density polyethylene (LDPE-MPs) and biodegradable microplastic (Bio-MPs) of poly-butylene-adipate-co-terephthalate (PBAT) mixed with polylactic acid (PLA), on rhizosphere bacterial communities of Phaseolus vulgaris at doses of 0.5 %, 1.0 % and 2.5 % (w/w, dry weight ratio between MPs and soil). Bio-MPs and LDPE-MPs showed significant higher α-diversity (Chao 1, ACE, Shannon and Simpson) than control. For each type of microplastic material, 2.5 % of LDPE-MPs and Bio-MPs showed lowest α-diversity as compared to doses of 0.5 % and 1.0 %, indicating 2.5 % dose of MPs might pose selective effect on rhizosphere bacterial communities. β-Diversity of 1.0 % and 2.5 % Bio-MPs were distinctive from the control and other treatments. Microplastics also affected the relative abundance at family level, i.e. as compared to control, Comamonadaceae was higher in all the MPs treatments, Rhizobiaceae was highest in 2.5 % LDPE-MPs and lowest in 2.5 % Bio-MPs. LefSe results showed, as compared to control, Bio-MPs induced more indictive taxa than LDPE-MPs. Our findings evidenced that LDPE-MPs and Bio-MPs exerted profound effects on rhizosphere bacterial communities, and these effects might have far-reaching effects on soil nutrient cycling and plant health in agroecosystems.
Keywords	Comamonadaceae ; Phaseolus vulgaris ; Rhizobiaceae ; agroecosystems ; beans ; biodegradability ; microbiome ; microplastics ; plant health ; pollution ; polyethylene ; polylactic acid ; rhizosphere ; soil ; soil nutrients ; Rhizosphere bacterial community ; Biodegradable plastic ; Low density polyethylene plastic ; 16S rRNA
Language	English
Dates of publication	2023-01
Publishing place	Elsevier B.V.
Document type	Article ; Online
Note	Use and reproduction
ZDB-ID	1196758-4
ISSN	0929-1393
ISSN	0929-1393
DOI	10.1016/j.apsoil.2022.104649
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Dynamic Community Detection

DUAN Xiangyu, YUAN Guan, MENG Fanrong

Jisuanji kexue yu tansuo, Vol 15, Iss 4, Pp 612-

A Survey

2021 Volume 630

Abstract: With the increasing diversity of social media, the demand for real-time analysis of social networks continues to increase, and research on dynamic community detection has received extensive attention. Existing community detection reviews mostly focus on ... ...

Abstract	With the increasing diversity of social media, the demand for real-time analysis of social networks continues to increase, and research on dynamic community detection has received extensive attention. Existing community detection reviews mostly focus on static community detection and the discussion of related methods, so network evolution analysis cannot be carried out. Besides, the entity data in the community are cross-substitutional and sequential. Therefore, the research status of dynamic community detection is studied, reviewed, and analyzed. First, based on the research background of complex networks, a general research framework for dynamic community detection is proposed. Then, the relevant definitions of dynamic community detection are formally expressed, and the evolution of dynamic communities at the network level and node level is analyzed in detail. According to the difference in architecture and technology, the dynamic community detection methods are summarized and classified. Combined with commonly used data sets, the static community detection algorithm is analyzed qualitatively and quantitatively with evaluation criteria. Finally, the typical application scenarios of community detection are introduced, the main challenges faced by current dynamic community detection research are discussed, and relevant solutions are put forward for dynamic communities, which outlines a clearer and comprehensive research direction for dynamic community detection research field.
Keywords	dynamic community detection ; social network ; network analysis ; dynamic community evolution ; Electronic computers. Computer science ; QA75.5-76.95
Subject code	006
Language	Chinese
Publishing date	2021-04-01T00:00:00Z
Publisher	Journal of Computer Engineering and Applications Beijing Co., Ltd., Science Press
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: An efficient computational method for predicting drug-target interactions using weighted extreme learning machine and speed up robot features.

An, Ji-Yong / Meng, Fan-Rong / Yan, Zi-Ji

BioData mining

2021 Volume 14, Issue 1, Page(s) 3

Abstract: Background: Prediction of novel Drug-Target interactions (DTIs) plays an important role in discovering new drug candidates and finding new proteins to target. In consideration of the time-consuming and expensive of experimental methods. Therefore, it is ...

Abstract	Background: Prediction of novel Drug-Target interactions (DTIs) plays an important role in discovering new drug candidates and finding new proteins to target. In consideration of the time-consuming and expensive of experimental methods. Therefore, it is a challenging task that how to develop efficient computational approaches for the accurate predicting potential associations between drug and target. Results: In the paper, we proposed a novel computational method called WELM-SURF based on drug fingerprints and protein evolutionary information for identifying DTIs. More specifically, for exploiting protein sequence feature, Position Specific Scoring Matrix (PSSM) is applied to capturing protein evolutionary information and Speed up robot features (SURF) is employed to extract sequence key feature from PSSM. For drug fingerprints, the chemical structure of molecular substructure fingerprints was used to represent drug as feature vector. Take account of the advantage that the Weighted Extreme Learning Machine (WELM) has short training time, good generalization ability, and most importantly ability to efficiently execute classification by optimizing the loss function of weight matrix. Therefore, the WELM classifier is used to carry out classification based on extracted features for predicting DTIs. The performance of the WELM-SURF model was evaluated by experimental validations on enzyme, ion channel, GPCRs and nuclear receptor datasets by using fivefold cross-validation test. The WELM-SURF obtained average accuracies of 93.54, 90.58, 85.43 and 77.45% on enzyme, ion channels, GPCRs and nuclear receptor dataset respectively. We also compared our performance with the Extreme Learning Machine (ELM), the state-of-the-art Support Vector Machine (SVM) on enzyme and ion channels dataset and other exiting methods on four datasets. By comparing with experimental results, the performance of WELM-SURF is significantly better than that of ELM, SVM and other previous methods in the domain. Conclusion: The results demonstrated that the proposed WELM-SURF model is competent for predicting DTIs with high accuracy and robustness. It is anticipated that the WELM-SURF method is a useful computational tool to facilitate widely bioinformatics studies related to DTIs prediction.
Language	English
Publishing date	2021-01-20
Publishing country	England
Document type	Journal Article
ZDB-ID	2438773-3
ISSN	1756-0381
ISSN	1756-0381
DOI	10.1186/s13040-021-00242-1
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Article: [Genetic analysis of a fetus with mosaicism Y chromosome aberration].

Meng, Fanrong / Ju, Duan / Wang, Xiuyan / Shi, Yunfang / Yang, Meng / Li, Xiaozhou

Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics

2023 Volume 40, Issue 11, Page(s) 1414–1419

Abstract: Objective: To carry out prenatal diagnosis for a fetus with mosaicism Yq deletion.: Methods: A fetus with high risk of sex chromosomes indicated by non-invasive prenatal testing (NIPT) at Tianjin Medical University General Hospital in July 2021 was ... ...

Abstract	Objective: To carry out prenatal diagnosis for a fetus with mosaicism Yq deletion. Methods: A fetus with high risk of sex chromosomes indicated by non-invasive prenatal testing (NIPT) at Tianjin Medical University General Hospital in July 2021 was selected as the study subject. Prenatal diagnosis of the fetus was performed with combined G-banded chromosomal karyotyping, fluorescence in situ hybridization (FISH), copy number variation sequencing (CNV-seq), real-time fluorescence PCR (QF-PCR), and ultrasound examination. Results: Analysis of the amniocytes at 23 gestational weeks had yielded a 45,X karyotype. However, FISH had shown signals of Y chromosome. Re-examination by cordocentesis had shown a mosaicism of 46,X,+mar[33]/45,X[17]. FISH showed that 69% of the cells had contained Y chromosome signals. The result of CNV-seq was seq[19]del(Y)(q11.1q12)(mos) chrY: g.13200001_ 28820000del (mosaicism rate = 64%), which suggested mosaicism for a Yq deletion, which encompassed the azoospermia factor (AZF) region. Deletion of the AZF region was verified by QF-PCR. The fetal karyotype was ultimately determined as mos46,X,del(Y)(q11.1)[33]/45,X[17]. Although ultrasound examination had shown no abnormality in the fetus, the couple had opted to terminate the pregnancy, and the induced fetus had a normal male appearance. Conclusion: The combined use of multiple techniques is beneficial for accurate and rapid prenatal diagnosis. For fetuses with mosaicism chromosomal abnormalities, it may be difficult to accurately predict the postnatal phenotype. It is therefore necessary to further explore their genotype-phenotype correlation in order to provide better guidance upon genetic counseling.
MeSH term(s)	Female ; Pregnancy ; Male ; Humans ; Mosaicism ; DNA Copy Number Variations ; In Situ Hybridization, Fluorescence ; Y Chromosome ; Fetus
Language	Chinese
Publishing date	2023-10-31
Publishing country	China
Document type	English Abstract ; Journal Article
ISSN	1003-9406
ISSN	1003-9406
DOI	10.3760/cma.j.cn511374-20221202-00830
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Article ; Online: Effect of different polymers of microplastics on soil organic carbon and nitrogen - A mesocosm experiment.

Meng, Fanrong / Yang, Xiaomei / Riksen, Michel / Geissen, Violette

Environmental research

2021 Volume 204, Issue Pt A, Page(s) 111938

Abstract	Agricultural microplastic pollution has become a growing concern. Unfortunately, the impacts of microplastics (MPs) on agricultural soil carbon and nitrogen dynamics have not been sufficiently reported. In an attempt to remedy this, we conducted a 105-day out-door mesocosm experiment in a soil-plant system using sandy soils amended with two types of MPs, low-density polyethylene (LDPE-MPs) and biodegradable (Bio-MPs), at concentrations of 0.0% (control), 0.5%, 1.0%, 1.5%, 2.0% and 2.5% (w/w, weight ratio of microplastics to air-dry soil). Soil organic matter (SOM), dissolved organic carbon (DOC), permanganate oxidizable carbon (POXC), available nitrogen (AN) of N-NH
MeSH term(s)	Carbon ; Dissolved Organic Matter ; Microplastics ; Nitrogen ; Plastics ; Polymers ; Soil
Chemical Substances	Dissolved Organic Matter ; Microplastics ; Plastics ; Polymers ; Soil ; Carbon (7440-44-0) ; Nitrogen (N762921K75)
Language	English
Publishing date	2021-08-31
Publishing country	Netherlands
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	205699-9
ISSN	1096-0953 ; 0013-9351
ISSN (online)	1096-0953
ISSN	0013-9351
DOI	10.1016/j.envres.2021.111938
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