Wednesday, January 24, 2024

 

Disinformation can reinforce polarization in society


The polarizing effects of disinformation endure even when faced with a powerful external shock


Peer-Reviewed Publication

AALTO UNIVERSITY

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RESEARCHERS FROM AALTO UNIVERSITY AND THE UNIVERSITY OF HELSINKI STUDIED HOW REAL-WORLD SHOCKS AFFECT ONLINE DISCUSSIONS, AND FOUND THAT DISINFORMATION REINFORCES POLARIZATION.

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CREDIT: MATTI AHLGREN/AALTO UNIVERSITY




With over four billion people eligible to vote in elections, 2024 is the largest election year ever. At the same time, disinformation and polarization on social media pose unprecedented challenges to the democratic process. New research from Aalto University and the University of Helsinki investigated how real-world shocks affect online discussions, using the Ukraine war and Finland’s NATO accession to understand how disinformation reinforces polarization.

‘The potential for democratic political participation in the world is greater than ever,’ says Tuomas Ylä-Anttila, associate professor of political science at the University of Helsinki. ‘At the same time, the deliberate use of disinformation by those who want to disturb democratic processes and generate polarization poses a threat to democracy and societal stability. This threat is now recognized widely, not just by political scientists but also organizations like the World Economic Forum.’

The research was a case study of how Russia's 2022 invasion of Ukraine affected discussions on NATO in the Finnish Twitter space immediately afterward. Finnish public opinion had long been split about joining NATO, with only around 20-30 percent in favour of joining the alliance. The Russian invasion led to a rapid convergence in favour of joining, which eventually led to Finland applying for membership. NATO and Russia are major themes in the campaigns for the Finnish presidential election, which will be held later this month.

The Russian invasion quickly depolarized NATO discussions in Finland but was unable to break a social bubble built on disinformation and conspiracy theories. These findings hold lessons for how disinformation will affect political campaigns elsewhere in today’s rapidly changing world.

‘By analysing retweeting patterns, we found three separate user groups before the invasion: a pro-NATO group, a left-wing anti-NATO group, and a conspiracy-charged anti-NATO group,’ says Yan Xia, a doctoral researcher at Aalto and lead author of the study. ‘After the invasion, the left-wing anti-NATO group members broke out of their retweeting bubble and connected with the pro-NATO group despite their difference in partisanship, while the conspiracy-charged anti-NATO group mostly remained a separate cluster.’

The research revealed that the left-wing anti-NATO group and the pro-NATO group were bridged by a shared condemnation of Russia’s actions and shared democratic norms. The other anti-NATO group, mainly built around conspiracy theories and disinformation, consistently demonstrated a clear anti-NATO attitude.

Disinformation persists even under threat

‘An external threat can bridge partisan divides, but bubbles upheld by conspiracy theories and disinformation may persist even under dramatic external threats,’ says Ylä-Anttila. ‘The continuity of these bubbles is likely explained by the notion that people within disinformation bubbles have limited communication with others outside their bubble, which tends to reinforce their prior beliefs.’

According to Ylä-Anttila, this effect is not limited to Finnish NATO discussions.

‘People who have strong, non-mainstream opinions are often more likely to hold on to their beliefs. They’re more prone to confirmation bias, meaning that they’re more likely to disregard information that is contrary to their own beliefs,’ says Ylä-Anttila.

‘For democratic decision-making, it’s essential to note that these disinformation bubbles are a part of our political reality and various actors that benefit from them – such as the Kremlin propaganda machine – will most likely try to exploit them.’

How did the researchers measure users’ opinions of NATO and social bubbles?

The research team consisted of network scientists from Aalto University and political scientists from the University of Helsinki. While network analysis can reveal the structure of user interactions and how it changes over time, analysing the content uncovers how the discussion climate evolves and what arguments connect or distinguish opposing sides. Combining research methods and expertise from computer science and social science offers a more holistic view of the discussions and dynamics on social media.

‘Network science methods enable us to measure structural polarization in these discussions and automate the search for different bubbles and other structures,’ says Mikko Kivelä, assistant professor at Aalto University. ‘In comparison to surveys, our methods are especially interesting because we can follow all of these discussions accurately after they have happened. In this research project, we were able to study and compare the discussions right before and right after the Russian invasion. We’re able to directly follow public discourse and the political elites that engage in it online.’

The research article was published in the European Physical Journal Data Science.

 

Research article:

Xia, Y., Gronow, A., Malkamäki, A. et al. The Russian invasion of Ukraine selectively depolarized the Finnish NATO discussion on Twitter. EPJ Data Sci. 13, 1 (2024). https://doi.org/10.1140/epjds/s13688-023-00441-2

 

Contrasting characteristics and outcomes of sports-related and non–sports-related traumatic brain injury


JAMA Network Open

Peer-Reviewed Publication

JAMA NETWORK





About The Study: In this study of 4,360 patients with traumatic brain injury (TBI), functional limitations six months after injury were common after sports-related TBI, even mild sports-related TBI. Persisting impairment was evident in the sports-related TBI group despite better recovery compared with non–sports-related TBI on measures of mental health and post-concussion symptoms. These findings caution against taking an overoptimistic view of outcomes after sports-related TBI, even if the initial injury appears mild.

Authors: Lindsay Wilson, Ph.D., of the University of Stirling in Stirling, United Kingdom, is the corresponding author. 

To access the embargoed study: Visit our For The Media website at this link https://media.jamanetwork.com/ 

(doi:10.1001/jamanetworkopen.2023.53318)

Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.

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Embed this link to provide your readers free access to the full-text article This link will be live at the embargo time http://jamanetwork.com/journals/jamanetworkopen/fullarticle/10.1001/jamanetworkopen.2023.53318?utm_source=For_The_Media&utm_medium=referral&utm_campaign=ftm_links&utm_term=012424

About JAMA Network Open: JAMA Network Open is an online-only open access general medical journal from the JAMA Network. On weekdays, the journal publishes peer-reviewed clinical research and commentary in more than 40 medical and health subject areas. Every article is free online from the day of publication. 

JOURNAL

No sex difference in concussion recovery among college athletes


More symptoms in women don’t delay concussion recovery, study finds


Peer-Reviewed Publication

OHIO STATE UNIVERSITY





A new large, national study of collegiate student-athletes in the United States dispels a long-held belief about concussions, finding that women and men recover from sport-related head injuries within the same time frame.                                             

Women and men’s recovery patterns were similar on tests of cognitive function, symptoms and mental health, and in balance and reaction time. Though women as a group entered the return-to-play protocol later than men, there was no significant difference in the time it took for men and women to return to unrestricted participation in their respective sports.

The findings are based on an analysis of medical data from 906 student-athletes competing in sports at National Collegiate Athletic Association (NCAA) institutions.

“I think a lot of people will be surprised in such a large sample that women and men recover along the same trajectory,” said senior study author Jaclyn Caccese, assistant professor in The Ohio State University School of Health and Rehabilitation Sciences. “For many years we’ve thought women took longer to recover, but evidence suggests that if women get the same access to care, they do recover similarly.”

The research was published recently in the journal Sports Medicine.

Data came from the Concussion Assessment, Research and Education (CARE) Consortium, an initiative established by the NCAA and U.S. Department of Defense to fill gaps in knowledge about concussion effects and recovery among student-athletes at colleges, universities and military service academies.

The study sample was 61% female and included student-athletes in 15 sex-comparable sports ranging from basketball and diving to ice hockey, soccer and volleyball. Members of all-male football and wrestling teams and all-female field hockey squads were excluded.

“Much of the concussion research came out of football, a predominantly male sport. This study is important because it’s the largest study of concussion recovery in women to date,” said Caccese, citing a 2022 review showing that 40% of 171 studies on which athlete concussion recovery consensus papers were based had no female participants and relied on samples that were overall 80% male.

“We’ve been making clinical decisions based on studies that included only a very small percentage of females,” she said. “But if student-athletes’ cognitive function, symptoms and mental health are recovering along the same trajectories, we probably don’t need to hold women back longer.”

Participants in the CARE initiative completed pre-season baseline assessments that enabled, for this study, comparisons to their health status after a sport-related concussion. Post-concussion evaluations were taken within six hours of the injury, 24-48 hours later, the day they entered return-to-play protocol, the day they were cleared for unrestricted play and six months post-injury.

The tests over that time period included assessments of cognition and memory, balance, reaction time, and overall symptoms and how distressing they were, as well as surveys on health, anxiety and depression, and satisfaction with life.

Statistical analysis showed that recovery trajectories did not differ by sex, with the exception of women reporting more problems with eye and inner ear function than men within 48 hours of injury. As a group, women waited a day longer than men to start return-to-play workouts, but there was no statistical difference in student-athletes’ return to unrestricted competition – on average, about two weeks post-concussion.

Women did report higher symptoms than men at baseline (headache, pressure in the head, fatigue, for example) and during recovery, though the study cannot explain why. The researchers posed the question in their paper: Could it be biological differences affecting symptom experience, or sociocultural differences in reporting behavior?

Caccese said this finding suggests that individual baseline data or established data on sex-specific norms is needed to properly evaluate athletes’ overall condition after a sport-related head injury.

“Otherwise, clinical providers might think women are not recovered who actually are,” she said.

She also noted that high schools have tended to focus athletic trainer resources over past years on sports with the highest injury risk – namely, football – meaning there’s a good chance female athletes at the high school level haven’t received the same level of medical attention.

“Student-athletes at the institutions in this study receive immediate access to the best sports medicine evaluation and treatment. I think that could be one of the driving factors in why we didn’t see much of a sex difference,” Caccese said. “Historically, some women’s sports didn’t have the same on-site access to health care, and what that does is result in delayed evaluation, delayed initiation of treatment and prolonged recovery. I think having someone on the field watching and taking care of athletes and knowing them and knowing how to provide concussion management is key.”

Co-authors of the study were investigators from multiple CARE Consortium member institutions, including its principal investigators.

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Contact: Jaclyn Caccese, Jaclyn.Caccese@osumc.edu

Written by Emily Caldwell, Caldwell.151@osu.edu; 614-292-8152

JOURNAL

DOI

SUBJECT OF RESEARCH

New model predicts how shoe properties affect a runner’s performance


Developed by MIT engineers, the model could be a tool for designers looking to innovate in sneaker design.


Peer-Reviewed Publication

MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Sneaker Design 

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RESEARCHERS MEASURE THE STIFFNESS OF MIDSOLE DESIGNS USING AN INSTRON MACHINE TO MIMIC FOOTSTEPS.

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CREDIT: CREDIT: MELANIE GONICK, MIT



A good shoe can make a huge difference for runners, from career marathoners to couch-to-5K first-timers. But every runner is unique, and a shoe that works for one might trip up another. Outside of trying on a rack of different designs, there’s no quick and easy way to know which shoe best suits a person’s particular running style. 

MIT engineers are hoping to change that with a new model that predicts how certain shoe properties will affect a runner’s performance. 

The simple model incorporates a person’s height, weight, and other general dimensions, along with shoe properties such as stiffness and springiness along the midsole. With this input, the model then simulates a person’s running gait, or how they would run, in a particular shoe. 

Using the model, the researchers can simulate how a runner’s gait changes with different shoe types. They can then pick out the shoe that produces the best performance, which they define as the degree to which a runner’s expended energy is minimized 

While the model can accurately simulate changes in a runner’s gait when comparing two very different shoe types, it is less discerning when comparing relatively similar designs, including most commercially available running shoes. For this reason, the researchers envision the current model would be best used as a tool for shoe designers looking to push the boundaries of sneaker design. 

“Shoe designers are starting to 3D print shoes, meaning they can now make them with a much wider range of properties than with just a regular slab of foam,” says Sarah Fay, a postdoc in MIT’s Sports Lab and the Institute for Data, Systems, and Society (IDSS). “Our model could help them design really novel shoes that are also high-performing.”

The team is planning to improve the model, in hopes that consumers can one day use a similar version to pick shoes that fit their personal running style.

“We’ve allowed for enough flexibility in the model that it can be used to design custom shoes and understand different individual behaviors,” Fay says. “Way down the road, we imagine that if you send us a video of yourself running, we could 3D print the shoe that’s right for you. That would be the moonshot.”

The new model is reported in a study appearing this month in the Journal of Biomechanical Engineering. The study is authored by Fay and Anette “Peko” Hosoi, professor of mechanical engineering at MIT.

Running, revamped

The team’s new model grew out of talks with collaborators in the sneaker industry, where designers have started to 3D print shoes at commercial scale. These designs incorporate 3D-printed midsoles that resemble intricate scaffolds, the geometry of which can be tailored to give a certain bounce or stiffness in specific locations across the sole. 

“With 3D printing, designers can tune everything about the material response locally,” Hosoi says. “And they came to us and essentially said, ‘We can do all these things. What should we do?’”

“Part of the design problem is to predict what a runner will do when you put an entirely new shoe on them,” Fay adds. “You have to couple the dynamics of the runner with the properties of the shoe.”

Fay and Hosoi looked first to represent a runner’s dynamics using a simple model. They drew inspiration from Thomas McMahon, a leader in the study of biomechanics at Harvard University, who in the 1970s used a very simple “spring and damper” model to model a runner’s essential gait mechanics. Using this gait model, he predicted how fast a person could run on various track types, from traditional concrete surfaces to more rubbery material. The model showed that runners should run faster on softer, bouncier tracks that supported a runner’s natural gait. 

Though this may be unsurprising today, the insight was a revelation at the time, prompting Harvard to revamp its indoor track — a move that quickly accumulated track records, as runners found they could run much faster on the softier, springier surface.

“McMahon’s work showed that, even if we don’t model every single limb and muscle and component of the human body, we’re still able to create meaningful insights in terms of how we design for athletic performance,” Fay says. 

Gait cost

Following McMahon’s lead, Fay and Hosoi developed a similar, simplified model of a runner’s dynamics. The model represents a runner as a center of mass, with a hip that can rotate and a leg that can stretch. The leg is connected to a box-like shoe, with springiness and shock absorption that can be tuned, both vertically and horizontally. 

They reasoned that they should be able to input into the model a person’s basic dimensions, such as their height, weight, and leg length, along with a shoe’s material properties, such as the stiffness of the front and back midsole, and use the model to simulate what a person’s gait is likely to be when running in that shoe. 

But they also realized that a person’s gait can depend on a less definable property, which they call the “biological cost function” — a quality that a runner might not consciously be aware of but nevertheless may try to minimize whenever they run. The team reasoned that if they can identify a biological cost function that is general to most runners, then they might predict not only a person’s gait for a given shoe but also which shoe produces the gait corresponding to the best running performance. 

With this in mind, the team looked to a previous treadmill study, which recorded detailed measurements of runners, such as the force of their impacts, the angle and motion of their joints, the spring in their steps, and the work of their muscles as they ran, each in the same type of running shoe. 

Fay and Hosoi hypothesized that each runner’s actual gait arose not only from their personal dimensions and shoe properties, but also a subconscious goal to minimize one or more biological measures, yet unknown. To reveal these measures, the team used their model to simulate each runner’s gait multiple times. Each time, they programmed the model to assume the runner minimized a different biological cost, such as the degree to which they swing their leg or the impact that they make with the treadmill. They then compared the modeled gait with the runner’s actual gait to see which modeled gait — and assumed cost — matched the actual gait. 

In the end, the team found that most runners tend to minimize two costs: the impact their feet make with the treadmill and the amount of energy their legs expend. 

“If we tell our model, ‘Optimize your gait on these two things,’ it gives us really realistic-looking gaits that best match the data we have,” Fay explains. “This gives us confidence that the model can predict how people will actually run, even if we change their shoe.”

As a final step, the researchers simulated a wide range of shoe styles and used the model to predict a runner’s gait and how efficient each gait would be for a given type of shoe. 

“In some ways, this gives you a quantitative way to design a shoe for a 10K versus a marathon shoe,” Hosoi says. “Designers have an intuitive sense for that. But now we have a mathematical understanding that we hope designers can use as a tool to kickstart new ideas.”

This research is supported, in part, by adidas.

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Written by Jennifer Chu, MIT News

Paper: “Modeling Running via Optimal Control for Shoe Design”

https://asmedigitalcollection.asme.org/biomechanical/article/doi/10.1115/1.4064405/1194089/Modeling-Running-via-Optimal-Control-for-Shoe

 

 

Special Feature calls attention to biological invasion research in China



Peer-Reviewed Publication

ECOLOGICAL SOCIETY OF AMERICA

"Ecological Applications" Special Feature: Management of Biological Invasions in China 

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EFFECTIVE MANAGEMENT OF INVASIVE ALIEN SPECIES IN CHINA CALLS FOR SCIENTIFIC STUDY OF SPECIES’ INVASION RISKS, MECHANISMS OF INVASION, PERFORMANCE AFTER INVASION AND IMPACTS.

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CREDIT: LIU ET AL. 2023




This month, the Ecological Society of America spotlights the challenge posed by invasive alien species in China with the release of a Special Feature, “Management of Biological Invasions in China,” in the latest issue of its journal Ecological Applications.

Accelerating rates of biological invasion have led to growing concerns about the destructive impacts of invasive alien species, or IAS, on the environment and human societies. This is especially true in China, which has witnessed a surge in research investigating the causes and consequences of these invasions.

“This collection came about because of the growing research interest in biological invasion in China, and the priority our government has given this issue,” said Xuan Liu, Professor with the Chinese Academy of Sciences’ Institute of Zoology and one of the Special Feature’s four Guest Editors, along with Wei Huang, Yanjie Liu and Aibin Zhan. “I am very pleased to share this collection of innovative studies from Chinese colleagues addressing the risks, mechanisms, performances, and impacts of invasive alien species in China, which are helpful for the development of effective control and mitigation strategies.”

The 24 articles that comprise the collection cover a wide range of organisms, from vertebrates and plants to freshwater mussels, snails and oysters. The research tackles critical questions like whether genetics can explain some IAS success; how nutrient pollution from fertilizers, sewage and the like affects IAS; and the availability of invasive plants for sale online in China.

“I think the collection as a whole offers valuable insights into the future of basic and applied biological invasion research coming out of China,” said Ecological Applications’ Editor-in-Chief Juan Corley. “These articles showcase a real diversity of methods and approaches, which will be needed to address the worrying problem of invasive species in China, particularly in the context of continued globalization.”   

Chinese translations of most of the articles’s abstracts are available. A Chinese-language summary of the Special Feature accompanies the collection.

 

Articles:

INTRODUCTION: Perspectives of invasive alien species management in China
Xuan Liu, Wei Huang, Yanjie Liu, Aibin Zhan

eDNA-based detection reveals invasion risks of a biofouling bivalve in the world's largest water diversion project
Zhiqiang Xia, Junnong Gu, Ying Wen, Xinkai Cao, Yangchun Gao, Shiguo Li, G. Douglas Haffner, Hugh J. MacIsaac, Aibin Zhan

High-latitude invasion and environmental adaptability of the freshwater mussel Limnoperna fortunei in Beijing, China
Congcong Wang, Mengzhen Xu, Jiahao Zhang, Xiongdong Zhou

Vulnerability of protected areas to future climate change, land use modification, and biological invasions in China
Yusi Xin, Zhixu Yang, Yuanbao Du, Ruina Cui, Yonghong Xi, Xuan Liu

Cultivated alien plants with high invasion potential are more likely to be traded online in China
Ran Dong, Bi-Cheng Dong, Qiu-Yue Fu, Qiang Yang, Zhi-Cong Dai, Fang-Li Luo, Jun-Qin Gao, Fei-Hai Yu, Mark van Kleunen

Clonal functional traits favor the invasive success of alien plants into native communities
Yong-Jian Wang, Yuan-Yuan Liu, Duo Chen, Dao-Lin Du, Heinz Müller-Schärer, Fei-Hai Yu

Population genetic differentiation and phenotypic plasticity of Ambrosia artemisiifolia under different nitrogen levels
Yunqi Xiong, Ayub M. O. Oduor, Caiyun Zhao

Transgenerational plasticity in morphological characteristics and biomass of the invasive plant Xanthium strumarium
Xinyue Liu, Xiaozhen Man, Meishan Chen, Changxin Zhao, Chuang Liu, Jialin Tong, Fanqi Meng, Meini Shao, Bo Qu

(Epi)genomic adaptation driven by fine geographical scale environmental heterogeneity after recent biological invasions
Yiyong Chen, Ping Ni, Ruiying Fu, Kieran J. Murphy, Russell C. Wyeth, Cory D. Bishop, Xuena Huang, Shiguo Li, Aibin Zhan

Multiple genetic sources facilitate the northward range expansion of an intertidal oyster along China's coast
Li-Sha Hu, Yun-Wei Dong

No evidence that modification of soil microbiota by woody invader facilitates subsequent invasion by herbaceous species
Yan Li, Xingliang Xu

Enhanced mutualism: A promotional effect driven by bacteria during the early invasion of Phytolacca americana
Yunhao Meng, Xinze Geng, Ping Zhu, Xinfu Bai, Ping Zhang, Guangyan Ni, Yuping Hou

Opposite effects of nutrient enrichment and an invasive snail on the growth of invasive and native macrophytes
Yimin Yan, Ayub M. O. Oduor, Feng Li, Yonghong Xie, Yanjie Liu

Disentangling the role of environmental filtering and biotic resistance on alien invasions in a reservoir area
Haichuan Le, Changming Zhao, Gaoming Xiong, Guozhen Shen, Wenting Xu, Ying Deng, Zongqiang Xie

Tidal channel meanders serve as stepping-stones to facilitate cordgrass landward spread by creating invasion windows
Zhonghua Ning, Baoshan Cui, Cong Chen, Tian Xie, Weilun Gao, Youzheng Zhang, Zhenchang Zhu, Dongdong Shao, Dongxue Li, Junhong Bai

Biotic resistance to fish invasions in southern China: Evidence from biomass, habitat, and fertility limitation
Dangen Gu, Tao Jia, Hui Wei, Miao Fang, Fandong Yu, Lu Shu, Xuejie Wang, Gaojun Li, Xingwei Cai, Xidong Mu, Meng Xu, Jianwei Wang, Yinchang Hu

Nutrient enrichment promotes invasion success of alien plants via increased growth and suppression of chemical defenses
Liping Shan, Ayub M. O. Oduor, Wei Huang, Yanjie Liu

Effects of nutrient pulses on exotic species shift from positive to neutral with decreasing water availability
Evans O. Otieno, Changchao Shen, Kaoping Zhang, Jinlong Wan, Minyan He, Zhibin Tao, Wei Huang, Evan Siemann

Fluctuations in resource availability shape the competitive balance among non-native plant species
Zhibin Tao, Changchao Shen, Wenchao Qin, Baoguo Nie, Pengdong Chen, Jinlong Wan, Kaoping Zhang, Wei Huang, Evan Siemann

Polyploidization-enhanced effective clonal reproduction endows the successful invasion of Solidago canadensis
Dongyan Feng, Jiliang Cheng, Xianghong Yang, Zhongsai Tian, Yujing Liu, Yu Zhang, Sheng Qiang

Leaf litter decomposition and its drivers differ between an invasive and a native plant: Management implications
Cai Cheng, Zixia Liu, Youzheng Zhang, Qiang He, Bo Li, Jihua Wu

Habitat-specific responses of soil organic matter decomposition to Spartina alterniflora invasion along China's coast
Guangliang Zhang, Junhong Bai, Christoph C. Tebbe, Laibin Huang, Jia Jia, Wei Wang, Xin Wang, Qingqing Zhao, Lixiang Wen, Fanlong Kong, Min Xi, Qiang He

Long-term Spartina alterniflora invasion simplified soil seed bank and regenerated community in a coastal marsh wetland
Peng Jia, Guojuan Qu, Jing Jia, Dezhi Li, Yuming Sun, Lu Liu

Restoration of native saltmarshes can reverse arthropod assemblages and trophic interactions changed by a plant invasion
Jia-Jia Jiang, Yu-Jie Zhao, Yaolin Guo, Lei Gao, Christina L. Richards, Evan Siemann, Jihua Wu, Bo Li, Rui-Ting Ju

The potential for synthesized invasive plant biochar with hydroxyapatite to mitigate allelopathy of Solidago canadensis
Wenna Xu, Xueyi Huang, Jiajie Yuan, Yanhong Wang, Mengmin Wu, Hongtai Ni, Lijia Dong

 

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