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Botany

“Tracking Toxic Mercury with Tree Rings: A Cost-Effective Solution”

Wild fig tree rings offer a cheap method for tracking toxic atmospheric mercury, a byproduct of gold mining in the Global South, according to a new study.

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The tracking of atmospheric mercury has become a pressing concern due to its toxic impact on both humans and wildlife. A recent study from Cornell University offers a promising solution: using wild fig tree rings to monitor mercury levels cheaply. This innovative method can be employed throughout the Global South, particularly in areas where gold mining is prevalent.

Research conducted in the Peruvian Amazon has shown that atmospheric mercury can travel across the globe, depositing back into landscapes and accumulating in organisms such as fish and other food sources. When it falls to the ground or in water, mercury acts as a neurotoxin, posing significant risks to human health and wildlife conservation.

Artisanal and small-scale gold mining accounts for approximately 20% of all gold produced worldwide, making it the biggest single source of mercury pollution. Liquid elemental mercury is used to separate gold from ore, resulting in mercury entering the environment through dumping or burning off residues.

Previous studies have utilized tree rings to track mercury levels from coal combustion, particularly in Canada. However, this method had not been applied in the tropics for measuring mercury from gold mining.

The researchers behind this study aimed to test the application of this technique in areas where expensive active monitors are impractical due to their high cost and energy requirements. In contrast, passive air samplers using activated charcoal can collect ambient mercury but come with a hefty price tag of up to $100 each.

“We’re trying to reduce emissions, especially from gold mining, as part of the United Nations Minamata Convention on Mercury,” said Jacqueline Gerson, the study’s corresponding author and assistant professor of environmental and biological engineering. “This really offers a method that can be employed throughout the Global South to understand changes in mercury over time, as well as spatial indicators of mercury.”

The use of wild fig tree rings provides a cost-effective solution for tracking atmospheric mercury levels, offering insights into how this toxic substance spreads across space and time. This knowledge is essential for developing effective strategies to reduce emissions and mitigate the impacts of mercury pollution on both humans and wildlife.

Biodiversity

“Newborns Thrive Near Newly Planted Trees: A Study Reveals the Power of Green Spaces in Promoting Healthy Birth Outcomes”

The link between proximity to greenspace — including trees and parks– and healthy birth outcomes is well established. Now new data adds to our understanding of these health benefits, accounting for other factors that may influence this link, such as education, income and body mass index, but also taking the body of knowledge a step further by exploring the effect of residing near newly planted trees.

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The article “Newborns living near trees tend to be healthier: New data suggests it’s not because healthier people reside near parks” presents groundbreaking research from Drexel University’s Dornsife School of Public Health. The study aimed to explore the impact of newly planted trees on birth outcomes, controlling for various factors such as education level, income, and body mass index.

Using a unique dataset of over 36,000 trees planted in Portland, Oregon between 1990 and 2020, researchers found a significant association between the number of trees planted within 100 meters of a mother’s home and higher birth weight. The study also discovered that nearby tree planting was linked to lower risks of pre-term birth and small-for-gestational-age birth.

The research revealed that each tree planted within 10 years before a child’s birth was associated with a statistically significant 2.3-gram increase in birthweight. Living within 100 meters of at least 10 trees was associated with about a 50-gram increase in birthweight, which could result in 642 fewer babies being considered small for gestational age.

The authors suggest that established older trees near one’s address may provide more benefits than newly planted trees by also providing psychological restoration and fostering a “soft fascination.” They speculate that this could be due to the developed natural environments reducing stress levels, which are associated with increased likelihood of delivering preterm babies and poor health outcomes later in life.

The study’s findings offer evidence supporting the link between trees and positive birth outcomes. While further research is needed to definitively prove causality, the current study provides valuable insights into the potential benefits of tree planting on public health from an early stage of life.

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Botany

California’s Hidden Giants: A New Record for the State’s Highest Tree

A professor’s casual hike in the High Sierra turned into a new elevation record for California’s highest tree, the Jeffrey pine, which wasn’t formerly known to grow at extreme elevations.

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California’s High Sierra is home to some of the most stunning natural wonders on the planet. Among these breathtaking landscapes, a new record for California’s highest tree has been discovered – a majestic Jeffrey pine standing tall at 12,657 feet elevation in Sequoia National Park.

Professor Hugh Safford, a forest ecologist from UC Davis, made this serendipitous finding while hiking in the High Sierra. As he paused to admire a foxtail pine and a lodgepole pine, he stumbled upon the Jeffrey pine, which seemed out of place due to its high elevation. “I walk over, and it’s a Jeffrey pine! It made no sense. What is a Jeffrey pine doing above 11,500 feet?” Safford exclaimed.

The Jeffrey pine grows in upper montane areas throughout the Sierra Nevada, but it is not typically found at such extreme high elevations. Yet, Safford recorded Jeffrey pines as high as 12,657 feet elevation – 1,860 feet higher than the highest on record and even higher than lodgepole, limber, and foxtail pines.

This discovery signifies a changing climate amid California’s highest peaks. As snow melts earlier and air temperatures rise, Jeffrey pine seeds are germinating on land that previously found frozen and inhospitable. The Clark’s nutcracker – a bird known for its high-altitude gardening skills – is suspected to be the primary seed disperser, carrying fleshy Jeffrey pine seeds up the mountain from thousands of feet below.

Safford’s work indicates that other species are growing higher than commonly used databases suggest. This finding has significant implications for our understanding of climate change impacts on high-altitude ecosystems. Species attempting to stay ahead of climate changes by moving uphill are doing so far too slowly to keep pace, climate modeling literature suggests. Yet the models do not account for the role of seed dispersals by birds and other species amid shifting windows of ecological opportunity.

The discovery underscores a need for scientists to couple powerful technologies with direct observation. The trees Safford encountered were not detected by any available database, artificial intelligence platform, satellite or remote sensing technology. “People aren’t marching to the tops of the mountains to see where the trees really are,” Safford said. “Instead, they are relying on satellite imagery, which can’t see most small trees.”

This summer, Safford and his students will be out there, hiking along Mount Whitney, Mount Kaweah, and Sequoia-Kings Canyon National Parks, identifying seedlings, measuring and identifying trees, and helping to develop models of accurate elevations to better understand the changing landscape of the High Sierra.

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Air Quality

Unveiling the Secret to Carbon Balance in Plants: The LIRI1 Gene Reveals its Role in Regulating Starch-Lipid Trade-Off

Starch and oils are known as storehouses of carbon in plants. However, the way in which carbon resources are allocated during metabolism in plants remained unknown. Now, however, using a forward genetics approach, researchers have identified that a gene named LIRI1 regulates this process, significantly increasing oil storage in leaves while reducing starch levels. Their findings provide insights into carbon allocation mechanisms, offering the potential for the development of renewable biofuel resources or low-starch foods.

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The article you provided is well-written and informative, but some improvements could be made to enhance clarity and structure. Here are my suggestions:

1. Clearer title: While the current title accurately summarizes the content, it’s a bit long and technical. Consider shortening it or rephrasing it for better readability.
2. Simplified language: The text is written in a formal and scientific tone, which might make it difficult to understand for non-experts. Try using simpler vocabulary and explanations to convey complex ideas.
3. Improved organization: Break up the content into sections with clear headings and concise summaries. This will help readers navigate the article more easily.
4. Visual aids: Incorporate images or diagrams to support key concepts, such as the micrograph of lipid droplets mentioned in the prompt.
5. Real-life applications: While the study’s findings are interesting from a scientific perspective, consider highlighting their potential practical implications, like developing crops with higher TAG storage for biofuel or food purposes.

Here’s a rewritten version of the article incorporating these suggestions:

Unveiling the Secret to Carbon Balance in Plants: The LIRI1 Gene Reveals its Role in Regulating Starch-Lipid Trade-Off

Plants store carbon in two primary forms: starch and triacylglycerols (TAGs). But what controls this balance? Researchers from Chiba University, Japan, have uncovered the mystery behind this trade-off by identifying a gene called LIRI1.

What is LIRI1 and how does it work?

Led by Associate Professor Takashi L. Shimada, the research team used a forward genetics approach to identify genes responsible for altered carbon storage patterns. They discovered that LIRI1 encodes an unknown protein that plays a crucial role in regulating starch and lipid biosynthesis pathways.

How did they discover this key regulator?

The researchers treated Arabidopsis seeds with ethyl methanesulfonate, inducing random DNA mutations. Among the screened plants, they found a mutant named lipid-rich 1-1 (liri1-1), which had five times more TAGs and half the starch content of wild-type plants.

What does this mean for plant development?

The overaccumulation of TAGs in liri1 mutants was due to the loss of function of the LIRI1 gene. This suggests that proper carbon allocation between TAGs and starch plays a role in normal plant development, as seen by growth defects and irregular chloroplasts in mutant plants.

What are the real-life implications?

Modifying LIRI1 could enable the development of crops with higher TAG storage in leaves, providing a renewable source for fulfilling demand. Such crops could eventually be tailored for human health, like low-starch food options for people with diabetes.

Remember to keep your tone formal and academic while writing scientific articles. Good luck!

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