Category: Environment - Sci-Tech Bulletin

Placental Health Risks Linked to Aromatic Hydrocarbon Exposure in Pregnancy

Higher exposure to environmental polycyclic aromatic hydrocarbons (PAHs) among women living in polluted areas has been linked to harmful effects on the human placenta. Key PAH biomarkers, including phenol and 1-hydroxypyrene, were associated with reduced placental hormone activity and decreased metabolic enzyme expression, indicating impaired placental function. It was also observed that lower expression of placental glutathione transferase and reduced placental phosphatase activity in placentas from polluted regions. In contrast, placentas from non-polluted areas showed significantly higher estrogen receptor activity and placental gonadotropin expression, highlighting the serious impact of industrial pollution on maternal and fetal health.

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Linkage between heavy metal resistant genes and antibiotic resistant genes

Marine E. coli Shows Strong Link Between Heavy Metal and Antibiotic Resistance

About 18 heavy metal resistance genes (HMRGs) associated with arsenic, cadmium, copper, and mercury resistance were identified in 308 E. coli isolates through whole genome sequencing and advanced bioinformatics analysis. Researchers also examined 25 antibiotic-resistant bacterial genomes and discovered important links between HMRGs and antibiotic resistance genes (ARGs). Notably, 100% of the analyzed genomes carried at least one copy of 11 out of the 18 identified HMRGs. These findings suggest that environmental pollution may play a significant role in driving antimicrobial resistance. The study also highlights the potential of using bacterial resistance genes as biomarkers for environmental contamination and emerging public health risks.

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Microbial Electrochemical Technology Treats Nitrate and Arsenic-Contaminated Groundwater

Microbial electrochemical technologies (METs) uses electro-bioremediation systems that can treat groundwater contaminated with nitrate and arsenite simultaneously. A continuous-flow bioelectrochemical reactor has been developed that reduces nitrate into harmless dinitrogen gas while oxidizing toxic arsenite into less harmful arsenate. The system can achieve high nitrate removal rates and over 95% arsenite oxidation efficiency under groundwater-like conditions. This works as the internal recirculation significantly improves treatment performance by enhancing mass transfers and microbial activity of denitrifying and arsenite-oxidizing bacteria like Sideroxydans sp and Achromobacter sp. Thus, electro-bioremediation as a sustainable, low-chemical, and energy-efficient solution for complex groundwater contamination challenges.

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Benzene Exposure Linked to Severe Systemic Sclerosis

Exposure to particulate (PM10) and benzene is associated with more severe skin involvement and reduced lung function. Benzene, in particular, is a potential environmental factor that influences the progression of systemic sclerosis. This disease is associated with early inflammation, immune dysfunction, and vascular injury, followed by progressive fibrosis of the skin and internal organs, especially the lungs. Higher benzene exposure may increase the vascular inflammatory-fibrotic burden, contributing to greater skin involvement and lung impairment, as reflected in DLCO measurements. Occupational exposure to substances such as crystalline silica dust, solvents, ketones, and welding fumes further elevates these risks.

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Monsoon season increases the risk of parasitic eye infection

A study confirms that a spore-forming unicellular parasite widely causes eye infection, termed as acute microsporidial keratoconjunctivitis (MKC), peaks during the monsoon season. Environmental factors such as rainfall, high humidity, and wind speed significantly increase the infection rate. In India, keratoconjunctivitis cases rise sharply in September and are lowest in May. Other known causes of infections are exposure to soil, sports activities, and water contamination in swimming pools. Air pollutants like O₃, CO, NO₂, and SO₂ show little impact on infection rates, though higher ground-level ozone may offer some protective effect.

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Rising Temperatures and Heatwaves may affect our mental health

A meta-analysis found that rising temperatures and heatwaves are linked to increased mental health problems, including higher mortality and hospital admissions. Each 1°C rise in temperature significantly raises risks for mood disorders, neurotic disorders, anxiety disorders, schizophrenia, and suicide. When the temperature stays extremely high for consecutive 3 days, older adults, males, and fragile populations living in tropical and subtropical climate zones are more vulnerable. As global temperatures rise, addressing heat-related mental health risks becomes increasingly important for healthcare systems and policymakers to adopt heat mitigation strategies and provide mental health support during extreme weather.

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Microorganisms adapting to environmental changes such as temperature, pH, and nutrient availability

How microorganisms adapt to changing environments at molecular level and undergo evolution

Microorganisms adapt to changing environments through molecular and cellular mechanisms by pleiotropy, often driven by changes in gene regulation and signaling pathways. Organisms may evolve as specialists or generalists depending on environmental variability and predictability. Strategies include anticipatory regulation, cellular memory, and stochastic bet-hedging. Rapid adaptations like gene amplification or aneuploidy provide short-term benefits but are costly long term. Research shows that genetic background strongly influences outcomes, making evolution context-dependent. These insights are important for understanding antibiotic resistance, cancer evolution, biotechnology, and managing adaptation in natural and applied systems.

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How Hot and Humid Weather Could Be Fuelling Influenza Pandemics

Study conducted on mice at various hydrothermal environments influences influenza H1N1 pandemics. The warm–wet environments supress our immune responses to influenza by reduction in cytokine production, suppressed T-cells differentiation, weakened T-cell activity, and impaired viral recognition RLH signalling pathway. As a result, infected hosts cannot effectively clear the virus, leading to persistent infections. These findings have implication in public health planning, highlighting the need to consider climate factors in disease prediction, surveillance, and early vaccine manufacture, especially in regions prone to warm and humid conditions.

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Natural environment could restore your ability to concentrate using attention Restoration Therapy (ART)

Attention Restoration Therapy (ART) as termed, is a psychological theory that suggests that spending time in natural environments helps to restore an individual’s focus and attention. ART states that nature engages the mind in a gentle way known as “soft fascination” that allows the brain to rest from effortful thinking, recover attention capacity and improve concentration afterward. Activities such walking in parks, spending time by the lake-side or daily morning jogging around natural surrounding improves attention, especially for demanding tasks like working memory and executive function.

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How Household Activities Increase Propylene Exposure upto 30 times

Propylene exposure above 1500 ppmv (as per Protective Action Criteria) from the residential sources such tobacco, wood combustion, cleaning agents and air fresheners are the largest contributors of acute health effects like dizziness, lightheadedness, headaches, nausea, eye irritation and respiratory discomfort. Severe exposure may also lead to central nervous system (CNS) toxicity, hyperosmolarity, hemolysis, cardiac arrhythmia, seizures, agitation, and lactic acidosis, especially in children. Indoor smoking is the largest contributor to rise the propylene levels up to 30 times and major source for individuals without occupational exposure.

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