Levels Of Elements Research Articles

Boron fertilization in a boreal Norway spruce forest: long-lasting effects on growth and nutrition

Abstract Background and aims Boron (B) deficiency is widespread in boreal forests, but it can be prevented by fertilization. As B deficiency reduces root growth, it may affect the uptake of other nutrients. We assessed the persistence of the effects of a one-time B application on growth and nutrition of Norway spruce (Picea abies). Methods A single-tree B-fertilization experiment was established in a highly productive stand in eastern Finland in 2000 and followed until 2018. The applied B dose was 2 kg ha−1. Results After 19 growing seasons, height growth was higher in B-fertilized trees and the effect was not waning. Diameter growth was not affected. The mean needle-B concentration without B fertilizer was 1.7 mg kg−1 and with B-fertilizer, 4.8 mg kg−1. Boron-fertilized trees had higher foliar aluminium (Al), carbon (C), copper (Cu) and sulfur (S) concentrations, and lower soluble silicon (Si). Conclusions The positive B effect on growth persisted after 19 years. Boron concentrations remained higher in fertilized trees, although lower than at the early stages of the experiment. Boron fertilization maintained Cu and S levels above deficiency limits. The small but consistent change in C indicates a change in needle compounds. Increased Al may result from reduced Si accumulation, as Al co-deposition with Si alleviates Al toxicity. Further studies are required to optimize B-fertilization practices and to elucidate the mechanisms behind the effects on height growth and the levels of other elements. A combination of soluble and sparingly soluble fertilizers could further increase the duration of the effect.

Geochemical signatures and contamination levels of rare earth elements in soil profiles controlled by parent rock and soil properties.

Rare earth elements (REEs) are emerging contaminants rendering potential risks in soils to environmental quality and human health. The causation between their geochemical signatures and contamination levels with parent rocks and soil properties are critical for REEs risk assessments, which are urgently needed globally. Thus, this study aimed to elucidate cause-and-effect among hydrofluoric-acid-digested total and ethylenediaminetetraacetic acid extracted bioavailable soil REEs and their contamination degree evaluated by pollution indices in 268 soil layer (horizon) samples from 50 soil profiles derived from felsic, intermediate, mafic, ultramafic, and sedimentary rocks in Taiwan. The total REEs was 133 ± 61.9mg/kg and all individual REEs were classified as minimal contamination by the enrichment factor. The highest total soil REEs was from granite, followed by sandstone and shale, mafic rocks, andesite, and ultramafic rocks. All soils were ranked as significantly pollution risk by the pollution loading index. Furthermore, REEs were accumulated in all subsoils due to the co-translocation with soil colloids during the intensive leaching, corresponding with their higher geoaccumulation index value than those in surface soils. The contamination degree and bioavailable REEs significantly increased with the increasing total REEs. However, the stronger sequestration of clay and free Fe oxides for heavy REEs (HREEs) over light REEs (LREEs) mitigated their bioavailability, especially in the highly weathered soils like Ultisols and Oxisols. This study highlighted the dominance of soil properties in REEs fractionation, where the preferential fixation of soil colloids for HREEs throughout soil profiles reduced their uptake risk for biome even under the rising contamination potential.

Recent Advances of Carbon Dots: Synthesis, Plants Applications, Prospects, and Challenges.

Nanomaterials and nanotechnology have garnered significant attention in the realm of agricultural production. Carbon dots (CDs), as a class of nanomaterials, play a crucial role in the field of plant growth due to their excellent properties. This review aims to summarize recent achievements on CDs, focusing on their methods of preparation and applications in plants systems. The effects of CDs on seed germination, growth, photosynthesis, nutritional quality, and stress resistance were studied. It has been demonstrated that CDs can promote seed germination and growth, as well as improve photosynthetic efficiency, ultimately leading to increase plants yield. The nutritional quality of the plants treated with CDs was significantly improved. Specifically, the levels of essential mineral elements, vitamins, amino acids, and other constituents that are beneficial to human health increased notably. Additionally, CDs show positive effects on augmenting plant resistance against environmental stresses, such as drought conditions, heavy metal toxicity, and high salinity. Finally, the prospects and challenges of the application of CDs in plant systems are also discussed, which provide a scientific basis for the future application of CDs in agricultural production.

Changes in salivary trace element levels correlate with periodontal health state of non-smokers, smoker and reverse smokers

Aim: The present research study was undertaken to find the changes in the levels of trace elements in saliva of healthy, non-smoker periodontitis, smoker periodontitis and reverse smoker periodontitis and to check if they can be used as a biomarker for easy detection of periodontitis. Methodology: Whole unstimulated saliva samples of the individuals were collected and processed to remove cell debris and mucous. Aluminium, copper, zinc, strontium, and chromium were analysed in the samples using an Agilent Microwave - Plasma atomic emission spectrometer. Results: Significantly higher levels of aluminium and copper were observed in the reverse smoker periodontitis group when compared to healthy group. The levels of strontium and zinc significantly decreased in reverse smoker periodontitis group. An antagonistic correlation between copper and zinc was observed in periodontitis groups. Interpretation: The present work shows that the estimation of different trace elements can help in easy identification of periodontitis and assessment of the severity of disease. Key words: Periodontitis, Saliva, Smoker periodontitis, Trace elements

Analysing the impact of electric kick-scooters on drivers: vibration and frequency transmission during the ride on different types of urban pavements

The purpose of this research is to determine the vertical vibration and frequency spectrum transmitted to the rider by electric scooters travelling on different types of road surfaces. Vibration analysis involves the measurement of vibration levels of e-scooter elements, accompanied by the analysis of the Fourier Transform Spectrum and using a t-sample measurement design and a one-sample statistical method. Approach in the research allows overall driver comfort to be assessed through frequency and vibration analysis, considering vibrations received by the hands and the whole body. In addition, the natural frequencies of the electric scooter components and their stability are being investigated to assess vibration transformation. The study includes an assessment of ride comfort and considers potential health implications. The results obtained facilitate the identification of critical risks associated with vertical vibration frequencies transmitted to individuals when riding electric kick-scooters in urban areas with different types of pavements.

Ameliorative role of bioactive compounds against lead-induced neurotoxicity.

Lead (Pb) is an environmental toxin ubiquitously present in the human environment due to anthropogenic activities and industrialization. Lead can enter the human body through various sources and pathways, such as inhalation, ingestion and dermal contact, leading to detrimental health effects. The majority of lead that enters the body is removed by urine or feces; however, under chronic exposure conditions, lead is not efficient, as lead is absorbed and transferred to numerous organs, such as the brain, liver, kidney, muscles, and heart, and it is ultimately stored in mineralizing tissues such as bones and teeth. The central nervous system is the most affected among all the organs and systems affected, as lead is a known neurotoxin. Lead absorption is elevated in the fasting state than in the fed state. Chelation therapy, which is used to treat lead poisoning, has various adverse effects, making this treatment detrimental because it disrupts the levels of other essential elements and redistributes lead to various tissues. One of the main mechanisms by which lead induces toxicity is through the generation of reactive oxygen species. Hence, bioactive compounds that are the source of antioxidants if consumed along with ongoing lead exposure can ameliorate the toxic effects of lead.

Reprogrammable Flexible Piezoelectric Actuator Arrays with a High Degree of Freedom for Shape Morphing and Locomotion.

The high degree of freedom (DoF) shape morphing widely exists in biology for mimicry, camouflage, and locomotion. Currently, a lot of bionic soft/flexible actuators and robots with shape-morphing functions have been developed to realize conformity, grasp, and movement. Among these solutions, two-dimensional responsive materials and structures that can shape morph into different three-dimensional configurations are valuable for creating reversible high DoF shape morphing. However, most existing methods are predetermined through the fabrication process and cannot reprogram their shape, facing limitations on multifunction. Besides, the achievable geometries are very limited due to the device's low integrated level of actuator elements. Here, we develop a polyvinylidene fluoride flexible piezoelectric actuator array based on a row/column addressing (RCA) scheme for reprogrammable high DoF shape morphing and locomotion. The specially designed row/column electrodes form a 6 × 6 array, which contains 36 actuator elements. By developing a high-voltage RCA control system, we can individually control all the elements in the array, leading to a highly reprogrammable array with various sophisticated high DoF shape morphing. We also demonstrate that the array is capable of propelling a robotic fish with various locomotions. This research provides a new method and approach for biomimetic robotics with better mimicry, aero/hydrodynamic efficiency, and maneuverability, as well as haptic display and object manipulation.

Роль культурной безопасности в концепции национальной безопасности Китая с позиций интерпретации «совокупной силы» теории марксизма

The article examines one of the problems of China's cultural security theory in the research of Chinese authors, who see in the Marxist doctrine of "cumulative force" one of the options for substantiating the interdependence of cultural and national security, on the one hand, and elements (levels, directions, etc.) of cultural security, on the other. Modern Chinese philosophy of culture, analyzing the ideas and thoughts of political leader Xi Jinping on the role of culture in security issues, cultural security in national security concepts, defining new methodological approaches to research, turns to the philosophy of Marxism, which is interpreted in China as a theory of socialism with Chinese characteristics. The purpose of this study is to substantiate that Chinese philosophers, referring to the Marxist doctrine of "cumulative force", interpret cultural security as the cumulative effect of the interaction of many internal and external cultural factors that ensure the protection and preservation of the cultural identity of the Chinese nation. The novelty of this study lies in the interpretation of China's cultural security as a systemically organized dynamic process aimed at protecting and preserving national heritage. The results of the study confirm that the appeal to the doctrine of the "cumulative force" of F. Engels reveals new possibilities for Chinese philosophers to substantiate their understanding of the possibilities of cultural security.

Potentially toxic trace elemental levels in the malignant and non-malignant tissues of lungs: a comparative study by multivariate analysis from Pakistan

ABSTRACT Lung cancer is the most prevalent and main cause of tumour-related deaths across the world. Exposure to environmental and occupational toxicants such as toxic trace elements is an important cause of lung carcinoma. Keeping in view, the current investigation was aimed to measure the concentrations of 10 elements Mn, Mg, Ni, Zn, Se, Cr, Cd, Fe, Pb and Cu in the malignant tissues and non-malignant tissues samples of lungs of patients. The samples were digested in HNO3 and HClO4 solutions and analysed by using atomic absorption spectrophotometric technique. On the average, significantly elevated levels of copper , lead , cadmium and chromium were detected in the malignant tissues than the non-malignant tissues of patients. Most of the elements exhibited noticeably disparities in their concentrations based on sex, nutritional habits, habitat and smoking habits of donor groups. The correlation coefficients between the elements in malignant tissues and non-malignant tissues were significantly diversed. Based on lung cancer types, zinc and cadmium were raised in adenocarcinoma, whereas copper and cadmium were elevated in squamous cell carcinoma patients. Average magnesium, zinc and lead were highest in stage IV, while nickel and iron were maximum in stage-III of the malignant tissues. The chromium and manganese referred to be maximum at stage-II while selenium, copper and cadmium were elevated at stage-I. Multivariate statistical methods based on the elemental concentrations exhibited clearly divergent groupings which may be linked to alter the metabolism of the metals in the tumour tissues and non tumour tissues of lungs.

Essential and toxic elements in nail samples from fishermen in Turkey

Toxic substances in seafood can accumulate in consumers and cause serious health problems. The purpose of this research was to evaluate the levels of 11 essential and toxic elements (arsenic, copper, mercury, zinc, iron, cadmium, chromium, lead, nickel, selenium and titanium) in nail samples from fishermen who frequently consumed seafood and control groups who consumed them less frequently. This study was conducted in the Marmara Sea coastal cities of Istanbul, Kocaeli, Tekirdağ and Yalova. 352 individuals were enrolled, 263 fishermen and 89 controls. A questionnaire was administered to the individuals, then fingernail samples were collected. Nail samples were digested by the addition of HNO3 and H2O2, then the element levels was measured by ICP-MS. Zinc and iron levels in fishermen’s nails were higher than in controls. Positive correlations were observed between levels of arsenic, mercury, iron, cadmium, chromium, lead, nickel, selenium, and titanium in the fishermen’s nails and monthly seafood consumption. Mean nail zinc and copper levels were lower than expected in both groups. Other elements were at expected levels. In conclusion, consuming seafood caught in this region does not result in element exposure sufficient to represent a risk, but may increase in the burdens of some elements.

Erratum to “Assessing background levels of trace elements in soils of Mato Grosso (Brazil) for environmental and food security” [CATENA 244 (2024) 108267

Erratum to “Assessing background levels of trace elements in soils of Mato Grosso (Brazil) for environmental and food security” [CATENA 244 (2024) 108267

Assessment of macroalgae and macroalgal extracts as a source of minerals in need of fine-tuning in multiple livestock production systems

This study evaluates the levels of macrominerals (Ca, Mg, P, K, Na, S), essential trace elements (Co, Cr, Cu, Fe, I, Mn, Mo, Ni, Se, Zn) and potentially toxic trace elements (Cd, Hg, Pb, As (inorganic and organic)) in seven species of macroalgae and in their extracts. The potential maximum levels of inclusion of macroalgal biomass and extracts in feed were assessed in multiple livestock (swine, ruminant, poultry, leporine and pisciculture). Overall, macroalgae contained high levels of I, reaching its highest levels in S. latissima (4131mg/kg DM) and L. ochroleuca (2780mg/kg DM). Arsenic concentrations ranged from 4.10mg/kg DM in Ulva spp. to 68.9mg/kg DM in S. latissima. Arsenic was mainly present as arsenosugars, of relatively low toxicity. Extracts had higher macrominerals and I levels, and lower essential and toxic trace elements levels compared to the biomass. Macroalgal biomass and extracts can be added to feed at 1-5% to fulfill the physiological needs of multiple livestock, being I contents the main factor limiting highest inclusion rates. Inclusion of S. latissima and L. ochroleuca should be limited to 0.72 and 0.66%, respectively. Maximum level of inclusion of different macroalgal products, as dried biomass or extracts, must be finely tuned. Low levels of inclusion of macroalgae and/or extracts in feed can be considered as an efficient and natural strategy to fulfill the macrominerals and iodine needs of multiple livestock.

Efficacy of myrrh extract against Eimeria labbeana-like experimental infection in Columba livia domestica: in vivo study

BackgroundThe Protozoan pathogen Eimeria is a significant issue in poultry production. Scientists are concerned with finding alternative strategies due to the spread of resistance against the commonly employed coccidiostats. This study examined how well myrrh extract (MyE) protected domesticated pigeons from an experimental Eimeria labbeana-like infection.MethodsFemale pigeons were divided into six groups (5 pigeons/group): Group1: control pigeon group, Group2: Non-infected and treated pigeon group with MyE (500 mg/kg). Group3: Infected and non-treated pigeon group, Group4: Infected and treated pigeon group with MyE (250 mg/kg), Group5: Infected and treated pigeon group with MyE (500 mg/kg), Group6: Infected and treated pigeon group with amprolium (1 g/L of H2O). Oral infection with 3 × 104 sporulated E. labbeana-like oocysts was used to inoculate groups (3–6). Three days after infection, groups (4–6) received daily treatment with MyE and amprolium for five days. Oocyst output was assessed on day 8 post-infection. After sacrificing the pigeons, the small intestine and blood were collected from each pigeon and processed for histological, biochemical, and oxidative damage examinations.ResultsThis study looked into the overall phenolic and flavonoid contents and MyE’s antioxidant activity. According to the data, the best dose of MyE was 500 mg/kg, which significantly decreased the output of oocysts produced (2.090 × 105 ± 1.04 × 104 oocysts/g.feces). This result has been linked to a -2.51% decrease in the pigeon’s body weight gain. The morphometric characteristics of freshly unsporulated and sporulated oocysts were obtained, and pigeons treated with MyE significantly decreased size. Furthermore, there was a significant decrease in both the number and size of the developmental stages of E. labbeana-like (i.e. meronts, gamonts, and developing oocysts) in the intestinal tissue among the MyE-treated group. MyE facilitates the disruption of intestinal homeostasis caused by E. labbeana-like infection, specifically concerning carbohydrates and proteins. Concurrent with the state of total antioxidant capacity (TAC), the antioxidant activity of MyE reduced the blood plasma levels of trace elements (Fe, Cu, Cr, Zn, and Ni).ConclusionOur findings suggest that MyE could be a useful antioxidant source and a replacement for coccidiostats in preventing and treating avian coccidiosis.

Exploring the Metal Composition of Eri Silkworm Cocoons Reared on Diverse Host Plant Combinations

Background: The objective of this study was to analyze the chemical composition of Eri silk cocoons that were reared on various combinations of host plants. The primary host plant castor and secondary host plants such as kesseru, tapioca, gulancha and papaya were utilized in various combinations for different instars. Methods: The present analysis was conducted in lab at Department of Entomology, Institute of Agricultural Sciences, Siksha ‘O’ Anusandhan, Bhubaneswar, Odisha, India during spring season of the year 2022-23. SEM/EDX was used to investigate the cocoons metal elements. Each sample was examined separately to evaluate metal content. Conductive carbon tape attached specimens to stubs. The metal elemental analysis of the scaffold was performed by EDX attached to the scanning electron microscope. Result: For silk cocoon inner surfaces, the metal elements were ordered as follows: C greater than O greater than Mo greater than K greater than Cl greater than Ca greater than Si greater than Na greater than Mg greater than Al. Some Eri cocoons were produced on different host plants and had somewhat different exteriors, but all had evenly distributed components. C and O were abundant on all silk cocoons’ inner and outer surfaces. Cocoons produced on many host plants have higher chemical metal element levels on their exterior and interior surfaces than those raised on a single host plant. The study suggests that chemical factors have a role in silk cocooning, encouraging the creation of β-sheet structure.

Metalomics Revealed that Changes of Serum Elements were Associated with Oxidative Stress-Induced Inflammation of Cortex in a Mouse Model of Autism.

Autism spectrum disorder (ASD) is a neurodevelopmental disorder emerging during early childhood. However, the mechanism underlying the pathogenesis of ASD remains unclear. This study investigated the alterations of elements in serum and prefrontal cortex of BTBR T + tf/J (BTBR) mice and potential mechanisms. The male BTBR mice were used for experimental group and C57BL/6J (C57) mice were used for control group (n = 15). After behavioral tests were monitored, serum and prefrontal cortex of mice were analyzed by ICP-MS. The results demonstrated that the level of copper (Cu) was increased, and the levels of calcium (Ca), magnesium (Mg), selenium (Se), cobalt (Co), iron (Fe) and zinc (Zn) were decreased in BTBR mice compared to C57 mice (p < 0.01). The levels of above differential elements in serum demonstrated positive correlations with those in prefrontal cortex. Meanwhile, differential elements in prefrontal cortex had correlations with the total distance traveled (open field test) and the number of marbles buried (marble burying test) in BTBR mice (p < 0.05 or p < 0.01). The abnormally changed elements in serum might cross blood-brain-barrier into the brain and lead to oxidative stress, causing inflammation. Furtherly, the levels of inflammation-related indicators including tumor necrosis factor-alpha (TNF-α), nuclear factor kappa-B (NF-κB), interleukin-6 (IL-6) and interleukin-1β (IL-1β) were increased in prefrontal cortex of BTBR mice (p < 0.01), which were consistent with the aforementioned results. Our study suggested that the abnormal elements in the serum of BTBR mice may cause oxidative stress and inflammation in prefrontal cortex, which might contribute to increase the understanding of ASD pathogenesis.

Finding Standard Levels for Some Special Physical Fitness Elements and Basic Skills of Volleyball for Juniors in the Middle Euphrates Clubs

Since tests and measurements are thought of as the fundamental sports tests that reveal the true level that the player reaches, they shed light on the secrets of the ability so that the coach can know the true level of the players to achieve good results. This highlights the significance of the research by identifying standard levels for young volleyball players through specific physical fitness elements and basic skills using evaluation tools. Regarding the research problem, although there are several tests for the components of particular physical fitness and fundamental volleyball skills, the results only provide raw values that are meaningless to the coach. Therefore, in order to assess the components of unique physical fitness and fundamental skills, these raw scores need to be transformed into standard ratings. We can establish benchmarks and levels for junior volleyball players in the Middle Euphrates clubs by assessing their actual physical attributes and fundamental ball skills. The purpose of the study was to determine the degree of fundamental skills and unique physical fitness components among junior volleyball players in the Middle Euphrates clubs. Establishing benchmarks for assessments of particular physical fitness components and fundamental abilities for young volleyball players in the Middle Euphrates clubs. In order to address the nature of the study problem, we employed a descriptive technique that made use of the survey method as well as relationships and correlations. The research sample's highest percentage in the preparation, agility, and strength tests was at the standard level (good), according to the most significant findings. Additionally, the research sample's maximum percentage in the speed tests was at the standard level, or average. Additionally, the research sample's lowest percentage in the spiking test was at the standard level, which is quite poor.

Trace elements in feathers, pectoral plumage, and blood of griffon vultures (Gyps fulvus) from a captive environment of Southern Italy.

Heavy metals and metalloids are increasingly recognised as a threat to avian health, especially in species at the top of the food chain such as vultures. Griffon Vultures (Gyps fulvus) are ideal bioindicators for studying environmental contamination due to their scavenging habits and territorial behavior. In this study, we analysed the concentrations of six trace elements (Cd, Pb, Cr, Sb, Ni, and Cu) in feathers, pectoral plumage, and blood samples of Griffon Vultures from a captive environment in Sicily, Southern Italy, using an ICP-MS method. Significant differences in the levels of trace elements were observed between different matrices (p < 0.05). The ramigal feathers were divided into rachis (basal, medial, apical), calamus, and barbs (basal, medial apical). The Principal Component Analysis (PCA) demonstrated a clear differentiation in metal accumulation between the sections of feather matrices and between pectoral plumage and blood, reflecting the diverse pathways and time of exposure and deposition. No significant differences in heavy metal concentrations were observed between sexes and age classes. This work highlights the effectiveness of using feather matrices for monitoring environmental exposure to toxic elements and highlight the importance of continuous surveillance of heavy metal contamination in reintroduced vulture populations.

Aeronomy of the atmosphere of ultra-hot Jupiter Kelt9B taking into account the kinetics of hydrogen atom levels

Ultra-hot Jupiter Kelt9b impels to reconsider existing models of the upper atmospheres of hot exoplanets, which were previously developed using the example of G or M star systems such as HD209458b and GJ436b. The unique conditions of interaction between the radiation of an A-class star and the atmosphere necessitate kinetic modeling of excited levels of elements, primarily the hydrogen atom. For Kelt9b, the absorption was measures for several Balmer lines and lines of a number of heavy elements, the quantitative interpretation of which is an urgent task. In this work, for the first time, 3D modeling of the atmosphere of a planet with a close location of the Roche lobe has been implemented, taking into account the aeronomy and kinetics of excited hydrogen.

Hazard Analysis and Human Health Risk Assessment in the Mytilus Galloprovincialis and Rapana Venosa Species in the Black Sea's Türkiye Coastline by Multivariate Analysis.

In this study; fourteen potentially toxic elements (PTEs) levels are measured in Mytilus galloprovincialis (MG) and in Rapana venosa (RV) intensively consumed in eight cities on the Black Sea coast of Türkiye. Additionally, human health risk levels from mollusks species consumption were assessed using multiple approaches and by Geographical Information Systems, spatial distribution map of PTEs of the region was prepared. The average PTEs levels in the two mollusks species are listed in the following order: Fe > Al > Zn > Cu > As > Mn > B > Cd > Se > Ni > Cr > Pb > Co > Hg with the levels of 114.8 > 79.7 > 39.49 > 9.75 > 5.74 > 3.22 > 2.97 > 2.74 > 0.72 > 0.40 > 0.24 > 0.22 > 0.11 > 0.015µgg-1 ww, respectively. The average concentration level of essential metals (Cu, Mn, Zn, Co and Fe) and toxic metals (Cr, Hg, Ni, Pb, Cd and As) was measured as 238.73µgg-1 ww in RV and 114.86µgg-1 ww in MG. The cities with the highest metal pollution index (MPI) levels were Rize, Samsun, Kastamonu and Sinop, respectively. The MPI values in mollusks soft tissue were 1.25 in MG and 2.51 in RV. For fourteen PTEs, the MPI from metal intake by ingesting two crustacea species were over than 1, indicating risk from consumption. In addition to this, since the THQ value of Cd and hazard index (HI) were determined above 1, it can be said that it does pose public health risk for RV.

Long-term exposure to bisphenol-A causes oxidative stress-related alterations at the genetic and cellular levels in the mature ovary of adult zebrafish.

Bisphenol-A (BPA) is categorized as a major endocrine-disrupting chemical (EDC) used to manufacture many plastic products. BPA affects reproductive performance and promotes infertility by causing hormonal imbalance, mitochondrial dysfunction, and altered gene expression. The present investigation aimed to evaluate the effects of BPA exposure for 28days on the activity or level of antioxidant response elements (AREs), mRNA expressions of antioxidant genes, and histomorphological changes in the ovary of adult zebrafish. The adult female zebrafish were randomly divided into four experimental groups, viz. control, vehicle (0.01% ethanol), low dose (BPA: 350µg/L), and high dose (BPA: 700µg/L) exposure groups. After BPA exposure in both groups, superoxide dismutase (SOD) activity and total antioxidant capacity (TAC) level were significantly (p<0.05) decreased in the zebrafish ovary. Whereas, catalase (CAT) activity and malondialdehyde (MDA) level were significantly (p<0.05) increased in both treatment groups. The sod mRNA expression was significantly (p<0.05) down-regulated in the high-dose BPA-exposed group. Whereas, cat and nuclear factor erythroid 2-related factor 2 (nrf2) mRNA expressions were significantly (p<0.05) up-regulated in both BPA-treated groups. Noticeable histomorphological alterations were recorded in the ovary of zebrafish exposed to low and high doses of BPA. The alterations in the activity of ARE, mRNA expressions of antioxidant genes, and histopathological changes suggest that exposure to BPA can cause endocrine disruption and damage to the ovary of adult zebrafish caused by oxidative stress.