Variation Of Concentration Research Articles

Characterization of organochlorine pesticides in the surface waters of Marchica Lagoon, Morocco

The main objective of this initial study is to assess the extent of surface water contamination in Marchica Lagoon caused by organochlorine pesticides (OCPs) historically used in agriculture through a sampling network consisting of eight stations covering all areas of the lagoon during the 2022 summer season. Located on Morocco’s Mediterranean coast, the lagoon has undergone several restoration actions since 2010 to improve its environmental state. However, this ecosystem is under constant pressure from its watershed, which can convey water pollution from agricultural, industrial, mining, and domestic sources, making continuous monitoring essential. Eight organochlorine pesticides (Alpha HCH, Beta HCH, Gamma HCH, Aldrin, Dieldrin, DDD, DDE, and DDT) were detected by gas chromatography-mass spectrometry (GC-MS) using the SIM (Selected Ion Monitoring) method. The results revealed OCPs contamination of the lagoon’s surface waters; the spatial variation of total OCPs concentrations (Σ8OCPs) ranged from 7.58 to 18.79 ng/l. The predominant element detected was β-HCH (lindane), recorded between the Bouarg channel and Selouane wadi, an area characterized by intensive agriculture.

Evaluation of physicochemical properties of Nile tilapia skin collagen extracted in acid médium.

Tilapia has high-temperature tolerance, can breed in captivity, grow fast, and have excellent cost-benefit. Because of these characteristics, this species is of great interest in aquaculture and, currently, the most produced fish in Brazil. However, by increasing tilapia production, there was also a rise in the amount of organic waste, mainly from filleting, which discards 70% of waste. There are many studies on collagen extraction from tilapia skin as an alternative to reduce these residues and add commercial value. In this work, the extraction of protein concentrate was tested using an acid protocol, in which the tilapia skins underwent a pre-treatment in an acid medium and saline precipitation, with variations in time and concentration. After its extraction, the skin was evaluated for ash, moisture, protein, solubility, and pH. The protein concentrate obtained showed low ash contents, and the humidity is within those presented by the literature. The protein concentrate showed levels from 68.73 to 80.58% of protein and a low solubility between 4.03 to 6.93%. In conclusion, acid extraction is a possible means of collagen extraction, and tilapia skin is a good alternative to reuse waste generated in the fish industry.

Deciphering the impact of microenvironmental factors on cuticular hydrocarbon degradation in Lucilia sericata empty Puparia: Bridging ecological and forensic entomological perspectives using machine learning models

Blow flies (Calliphoridae) play essential ecological roles in nutrient recycling by consuming decaying organic matter. They serve as valuable bioindicators in ecosystem management and forensic entomology, with their unique feeding behavior leading to the accumulation of environmental pollutants in their cuticular hydrocarbons (CHCs), making them potential indicators of exposure history. This study focuses on CHC degradation dynamics in empty puparia of Lucilia sericata under different environmental conditions for up to 90 days. The three distinct conditions were considered: outdoor-buried, outdoor-above-ground, and indoor environments. Five predominant CHCs, n-Pentacosane (n-C25), n-Hexacosane (n-C26), n-Heptacosane (n-C27), n-Octacosane (n-C28), and n-Nonacosane (n-C29), were analyzed using Gas Chromatography-Mass Spectrometry (GC–MS). The findings revealed variations in CHC concentrations over time, influenced by environmental factors, with significant differences at different time points. Correlation heatmap analysis indicated negative correlations between weathering time and certain CHCs, suggesting decreasing concentrations over time. Machine learning techniques Support Vector Machine (SVM), Multilayer Perceptron (MLP), and eXtreme Gradient Boosting (XGBoost) models explored the potential of CHCs as age indicators. SVM achieved an R-squared value of 0.991, demonstrating high accuracy in age estimation based on CHC concentrations. MLP also exhibited satisfactory performance in outdoor conditions, while SVM and MLP yielded unsatisfactory results indoors due to the lack of significant CHC variations. After comprehensive model selection and performance evaluations, it was found that the XGBoost model excelled in capturing the patterns in all three datasets. This study bridges the gap between baseline and ecological/forensic use of empty puparia, offering valuable insights into the potential of CHCs in environmental monitoring and investigations. Understanding CHCs' stability and degradation enhances blow flies' utility as bioindicators for pollutants and exposure history, benefiting environmental monitoring and forensic entomology.

The fingerprint of tropospheric ozone on broadleaved forest vegetation in Europe

Tropospheric ozone (O3) increased globally in the 20th century, contributes to climate change and can have adverse effects on terrestrial ecosystems. The response of forest vegetation to ozone is modulated by species- and site-specific factors and visible foliar symptoms (VFS) are the only direct evidence of ozone effects on vegetation. VFS have been observed and reproduced under (semi-) controlled conditions and their field assessment has been largely harmonized in Europe. We analyzed ozone concentration and VFS data as measured at (respectively) 118 and 91 intensive monitoring sites of the International Co-Operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests (ICP Forests) spanning over five European biogeographic regions from 2005 to 2018. Average values for VFS were calculated accounting for the number of species present and their observed frequency. Spatial and temporal variation of ozone concentrations, VFS, and their relationships across Europe were then investigated by applying Generalized Linear Mixed Models (GLMMs) and combined GLMMs. Ozone concentrations exceeded 40 ppb on 37.3 % of the sites and were significantly higher (p < 0.05) in the Alpine and the Mediterranean regions. Over the 2005–2018 period there was a substantial stagnation of ozone concentrations with a tendency towards decreasing values in the Alpine-Boreal sites and increasing values in the Atlantic sites. Ozone left a “fingerprint” in terms of VFS on 38 % of the observed broadleaved woody species across Europe, with no significant difference among biogeographic regions. Overall, and again with the exception of an increase at the Atlantic sites, the frequency of VFS remained unchanged or has been slightly declining over the investigated period. We found positive relationship between ozone concentrations and VFS across Europe (p < 0.05), while their temporal trends (both insignificant) were not related. The species with the highest frequency of VFS were those classified as sensitive species under controlled/semi-controlled experimental conditions. Frequency of VFS tends to be modulated by vegetation traits such as specific leaf area and leaf thickness (p < 0.10). Our results showed that, although ozone levels suggested a North-to-South gradient of increasing potential risk to vegetation with hot spots in the Alps and in the Mediterranean, VFS observed on the actual species assemblage at the sites modifies this picture. According to frequency of VFS, ozone risk for vegetation may be higher in parts of the Alpine and Continental Europe than in the Mediterranean region.

Effect of Pr and Mn co-substitution on Structural and Optical Properties of Bismuth Ferrite

One of the most recent developments in the area of modern optics arises due to perovskite materials. The ABO3 perovskite materials like bismuth ferrite is an appealing alternative for various optical devices. Hence, in the present study, Praseodymium (Pr) and Manganese (Mn) co-substituted bismuth ferrite ceramics are prepared by the modified sol-gel method and the correlation between structural and optical properties with the variation in co-substitution concentration has been investigated. Rietveld refinement of X-ray diffraction patterns demonstrates a structural phase change in crystal symmetry from rhombohedral to orthorhombic phase with the increase in concentration for x ≥ 0.025. Lattice deformation in the co-substituted samples is confirmed by Fourier Transform Infrared (FTIR) and Raman spectra. UV–vis diffuse reflectance spectra confirm the strong absorption of light in the visible region. Furthermore, optical energy band gap decreases from 1.95 eV to 1.50 eV with increase in concentration from x = 0.000 to x = 0.100. The refractive index attains the maximum value i.e. 6.16 for x = 0.025 whereas it drops to minimum value of 4.06 for x = 0.100. This demonstrates that the structural modification in bismuth ferrite can be used to tune its optical parameters for the device applications.

Infant Ustekinumab Clearance, Risk of Infection, and Development After Exposure During Pregnancy

Background and aimEvidence on ustekinumab safety in pregnancy is gradually expanding, but its clearance in the postnatal period is unknown. The aim of this study was to investigate ustekinumab concentrations in umbilical cord blood and rates of clearance after birth, as well as how these correlate with maternal drug concentrations, risk of infection, and developmental milestones during the first year of life. MethodsPregnant women with inflammatory bowel disease were prospectively recruited from 19 hospitals in Denmark and the Netherlands between 2018 and 2022. Infant infections leading to hospitalization/antibiotics, and developmental milestones were assessed. Serum ustekinumab concentrations were measured at delivery and specific time-points. Non-linear regression analysis was applied to estimate clearance. ResultsIn 78 live-born infants from 76 pregnancies, we observed a low risk of adverse pregnancy outcomes and normal developmental milestones. At birth, the median infant:mother ustekinumab ratio was 2.18 (95%CI,1.69-2.81). Mean time to infant clearance was 6.7 (95%CI,6.1-7.3) months. One-in-four infants at 6 months had an extremely low median concentration of 0.015 μg/ml (range:0.005-0.12) . No variation in median ustekinumab concentration was noted between infants with (2.8μg/ml; range,0.4-6.9) and without (3.1μg/ml; range,0.7-11.0) infections during the first year of life (p=0.41). ConclusionsNo adverse signals after intrauterine exposure to ustekinumab were observed with respect to pregnancy outcome, infections, or developmental milestones during the first year of life. Infant ustekinumab concentration was not associated with risk of infections. With the ustekinumab clearance profile, live attenuated vaccination from 6 months of age seems of low risk.

Revolutionizing Automated Agriculture: A Brief Overview of an Advanced Smart Agriculture System Using Arduino UNO

This project presents a Smart Agriculture System that uses sensor technologies to improve crop monitoring and automate irrigation procedures. A variety of sensors are integrated into the system, such as a temperature sensor, a gas sensor, a photodiode for ambient light sensing, and a soil moisture sensor. When taken as a whole, these sensors offer real-time information on the concentrations of gases, ambient light levels, temperature fluctuations, and soil conditions in agricultural environments. The system’s primary function is to continuously monitor soil moisture levels in order to determine when irrigation is necessary. A water pump is activated when a predetermined moisture threshold is reached, guaranteeing timely and precise irrigation for the best possible crop growth. By monitoring the climate, the temperature sensor helps determine the environmental factors that affect crop health. Farmers can monitor important parameters with ease thanks to the convenient and user-friendly interface that the real-time display of sensor data on an LCD screen provides. Furthermore, by measuring the amount of natural light present, the ambient light sensor helps the system to optimize planting schedules and comprehend the impact of sunlight on crop development. The addition of a gas sensor expands the capabilities of the system by identifying possible environmental risks or variations in gas concentrations that could have an impact on crop quality. In addition to providing farmers with useful information about the health of their crops, this integrated smart agriculture system makes irrigation automation easier, saving water and increasing overall agricultural productivity. Due to its flexibility and scalability, the system is an invaluable resource for contemporary precision agriculture, contributing to sustainable farming practices and increased crop yields.

Variation of phosphorus concentration and flux in Wujiang River entering the Yangtze River and source apportionment

Variation of phosphorus concentration and flux in Wujiang River entering the Yangtze River and source apportionment

INSIGHTS INTO SOIL CARBON DYNAMICS: A COMPREHENSIVE REVIEW ON CONCENTRATION AND STABILITY VARIATIONS IN TOP AND DEEP SOILS WITH VARIED AGGREGATE SIZE UNDER CLIMATE CHANGE IN SUBTROPICAL INDIA

This comprehensive review delves into the intricate dynamics of soil organic carbon (SOC) under the influence of climate change in the sub-tropical context of India. Focusing on both topsoil and deep soils with varied aggregate sizes, the study employs dynamic modeling to analyze SOC concentration and stability variations. By synthesizing existing research, this review aims to provide insights into the multifaceted interactions shaping SOC dynamics in response to evolving climatic conditions. Understanding these variations is crucial for formulating effective soil management strategies and promoting sustainable agricultural practices.

Role of 1D edge in the elasticity and fracture of h-BN doped graphene nanoribbons

Recent achievement of BN-graphene alloy material has enabled the potential of bandgap tuning through both sub-10 nm width control and BN concentration variation. However, its mechanics, which is necessary for prediction of stability in functional applications, is not well studied. Here, molecular dynamics simulation is performed to conduct uniaxial tensile test for BN-doped graphene nanoribbons (BN-GNR) with varying widths and BN atom fractions. Efforts are made to study the constitutive relations for the edges and the whole BN-GNR and explore the fracture mechanisms of the hybrid nanoribbons. The substantial softening effect of the edges induced by wrinkling alters the impact of BN concentration on the stiffness in the sub-20 nm regime deviating from the linear behaviour observed in the bulk case. Fracture properties are unexpectedly independent of BN concentrations unlike in the bulk and the failure behaviour is rather decided by the graphene ribbon edge structure. Here the armchair edges serve as the source of crack nucleation at an early stage leading to weakened strength and reduced stretchability, whereas zigzag edges do not promote early crack nucleation and leads to the size dependence of fracture properties.

Genesis of Sulfide Mineralization in the Gallala Area Kurdistan Region, Iraq: Constraints from Major and Trace Elements of Sulfide Ore Mineralization and their Host Rocks

This article presents and interprets new geochemical data from the Gallala sulfide mineralization, situated in the Choman District of the Kurdistan Region of Iraq close to the Iraq and Iranian border. The host rocks belong to the Walash-Naopurdan Group, which developed in the Paleocene-Eocene age in the Zagros Suture Zone. The ore mineral assemblage of the Gallala area consists of pyrite, chalcopyrite, sphalerite, and magnetite. The mineral chemistry and geochemical analysis indicate that there is a significant variation in concentrations of pyrite, chalcopyrite, sphalerite, and magnetite from the Gallala mineralization. The trace element characteristics of the sulfide mineralization and their host rocks indicate that the ore-forming materials were derived from hydrothermal fluids being interacted with the igneous rocks. The trace element signatures and REE distributions of the studied samples, tectonically lead to suggest island-arc and back-arc environments in the Gallala area. Additionally, the REE patterns of the Gallala sulfides indicate the ore-forming fluids are related to arc-related hydrothermal systems. The integration of geochemical features along with the chemistry of ore mineralization such as the Selenium/Sulfur ratio of pyrite, Co/Ni ratios from both pyrite and chalcopyrite, the Zn/Cd values from the sphalerite, and the petrogenetic discriminate diagrams of magnetite reveal that the genesis of the sulfide mineralization can be attributed to volcanogenic to hydrothermal ore-formations with high to medium temperatures origin.

Kinetic of Dissolution of Nickel Limonite Calcine by Sulfuric Acid Solution

Currently, more than 60% of nickel processing is carried out using nickel sulfide as a raw material. Nonetheless, due to the depletion reserves of nickel sulphide, nickel laterite has drawn a lot of interest to be processed as raw material. Nickel laterite in Indonesia is generally found in low grades, with nickel concentration of &lt;1.15%. One method of treating nickel limonite is leaching in a sulfuric acid solution. This study aims to determine the reaction rate in the leaching process of calcine nickel limonite and the effect of sulfuric acid concentration and leaching temperature on the percent nickel extraction. In this research, the limonite ore from Pomalaa, Southeast Sulawesi, Indonesia, which has undergone a reduction process, was used as raw material. This research was conducted by leaching method on nickel limonite calcine using sulfuric acid reagent with 0.2, 0.5, and 1 M concentration variation, temperature variations of 60, 70, and 90°C, stirring speed 500 rpm, and %S/L (w/w) 10%. In this leaching research, the activation energy obtained at a sulfuric acid concentration of 0.2, 0.5, and 1 M are 13,7379 kJ/mol, 19,7582 kJ/mol, 20,3161 kJ/mol, respectively. The leaching process of nickel limonite calcine was controlled by diffusion. The optimum nickel extraction percentage in this study was 97.45%, obtained at a concentration of 1 M sulfuric acid, temperature of 70 °C, and leaching time of 240 minutes.

Optimization and Characterization of Adsorbent from Palm Kernel Shell Waste Using H3PO4 Activator

&lt;p class="E-JOURNALHeading1"&gt;Palm kernel shell is solid waste produced from the processing of crude palm oil (CPO). In this context, phosphoric acid (H&lt;sub&gt;3&lt;/sub&gt;PO&lt;sub&gt;4&lt;/sub&gt;) serves as an essential activator for producing an adsorbent with maximum micropore under operating conditions at a temperature of &amp;lt;450&lt;sup&gt;o&lt;/sup&gt;C. Therefore, this study aimed to determine the optimal adsorbent condition of the palm kernel shell using H&lt;sub&gt;3&lt;/sub&gt;PO&lt;sub&gt;4&lt;/sub&gt;activator. The production process was optimized using Response Surface Methodology (RSM) and Central Composite Design (CCD) methods with activator concentration variations of 4%, 5%, and 6%, at activation times of 23 hours, 24 hours, and 25 hours, respectively. The quality of the adsorbent produced fulfilled SNI standard 06-3730-1995, characterized by water content of 1.001%, ash content of 5.767%, missing substance level of 18.932%, and fixed carbon content of 75.301%. Furthermore, this work effectively optimized the RSM and CCD adsorbent production process, achieving 4.785% variation in activator concentration and 24.679 hours activation time.&lt;/p&gt;

Pembuatan dan Karakterisasi Kertas Kemasan Berbasis Ampas Kunyit dan Jahe Merah dengan Variasi Konsentrasi Natrium Hidroksida

The production of herbal beverages such as ginger, turmeric, and other spices generates waste that is commonly discarded. The cellulose content in red ginger is about 60-80%, and in turmeric, it is 50%. The high cellulose content makes red ginger and turmeric waste suitable for use as raw materials for paper production. The objective of this research is to determine the optimum conditions for making paper based on red ginger and turmeric waste. The pulp formation process was carried out using the Semi-Mechanical Method, which involves the addition of chemical solutions and grinding, on a mixture of turmeric and red ginger waste (60:40) with variations of NaOH concentration at 8%, 10%, and 13% (w/v). The papermaking process began with refining and drying the waste, cooking the pulp, adding water and kaolin filler, and then printing. Characterization included antibacterial testing, tensile strength, and grammage. Based on the pulp characterization results at the optimum NaOH concentration of 8%, the moisture content was 8.89%, cellulose content was 49.28%, and lignin content was 9.28%. These parameters comply with the national standard (SNI) for packaging paper. The paper characterization results showed a tensile index of 2.12 Nm/gram, an antibacterial inhibition zone of 5 mm, and a grammage of 13 g/m2. This research indicates that the NaOH concentration influences the moisture, cellulose, and lignin content. Furthermore, based on the characterization results, paper made from turmeric and ginger waste has the potential to be used as antimicrobial packaging paper.

Assessing silica-based gel system for high-temperature water shut-off applications

Excessive water production in oil and gas wells poses a significant challenge for reservoir management, necessitating effective water shut-off solutions. This study focuses on the development and evaluation of a colloidal silica-based fluid system tailored for high temperature water shut-off applications in challenging reservoir conditions. The system comprises colloidal silica and an activating salt, characterized by its low viscosity, enabling deep penetration and effective treatment. The evaluation methodology employed in this study encompasses visual assessment of gelation time and precise viscosity measurements. Key findings include the influence of temperature, salt concentration, silica content, and activating salt concentration on gelation kinetics. Higher temperatures, increased salt concentration, and elevated silica content were found to significantly expedite gelation, impacting the system’s efficiency. Moreover, different activator ions exhibited varying effects on gelation, primarily attributed to their charge density and size, adding nuance to the gelation dynamics. The study also revealed the system’s sensitivity to even minor variations in salt concentration, particularly when exposed to elevated temperatures. Based on these findings, a practical application strategy is proposed. When deploying silica gels in formations characterized by high salinity formation water and elevated temperatures, the introduction of a low-salinity water preflush is advised. This strategic approach mitigates premature gelation, ensuring the effectiveness of water shut-off operations. Keywords: water shut-off; silica gel; gelation time; sandpack; high temperature.

Dextrose Equivalent (DE) Variation and Maltodextrin Concentration Effects in Yoghurt Powder Characteristics Using Foam-mat Drying

Lactic Acid Bacteria (LAB) in yoghurt is a probiotic bacteria which potentially improves intestinal health. Yoghurt has a high moisture content. Thus, storing it at low temperatures can maintain the stability of microbes in the yoghurt. Yoghurt stored in the refrigerator has a maximum shelf life of 10 days. Yoghurt powder is one of the alternative solutions to prolong the shelf life. This study used a randomized design of factorial groups with variations of dextrose equivalent (DE) values of 10-12 and 18-20, as well as variations of maltodextrin concentrations of 10, 15, and 20%. The study aimed to determine the DE value and maltodextrin concentration which can produce the best quality synbiotic yoghurt powder. The quality of this synbiotic yoghurt was assessed by the highest yield, lowest water content, highest solubility, highest water absorption, highest acidic titrated total, highest total of lactic acid bacteria, and highest organoleptic. The study obtained that the DE value of maltodextrin affected the total LAB. Meanwhile, the concentration of maltodextrin affected the yield, moisture content, solubility, acidic titrated total, and total of LAB. The interaction between the DE value and the concentration of maltodextrin did not affect all the parameters of this study.

Optimization of Chromium (VI) Adsorption using Microalgae Biomass (Spirulina sp.) and its Application in Leather Tannery Waste

&lt;p class="E-JOURNALAbstractBodyEnglish"&gt;This study was conducted to examine the adsorption of Cr (VI) metal using Spirulina sp (inactive) biomass and its application in leather tannery wastewater. The treatment was carried out to determine the influence of independent variables on Cr (VI) adsorption with variations in pH, contact time, and metal solution concentration. The values of the solution pH, adsorption time, and concentration of the best metal solution were used to determine the center points of the optimization variables through Response Surface Methodology (RSM). The results showed that based on the FTIR test, macromolecules present in Spirulina sp biomass included amino, carboxylate, and hydroxy groups. The combination of factor variables that produced the optimum response was at pH 3.165, contact time of 66.58 minutes, and Cr (VI) metal ion solution concentration of 22.9 mg/L, resulting in a Cr (VI) adsorption efficiency of 69.66%. The adsorption pattern was included in the Freundlich adsorption isotherm, and the application of Spirulina sp biomass adsorbent to tannery waste reduced the concentration of Cr (VI) from 3.9 g/L to an undetectable level at &amp;lt;1.4 g/L.&lt;/p&gt;

Genetic Diversity of Bio-fortified Lentils (Lens culinaris Medik.) through Simple Sequence Repeat Markers

Nepalese lentils are comparatively rich in iron and zinc, making it a potential crop of whole food solution to aid in the global battle against the micronutrient malnutrition. Understanding the genetic basis for uptake of grain iron and zinc is required to increase their stable concentrations along with these minerals in lentils. This study aimed at characterizing genetic variation in micronutrient high grain iron and zinc concentrations and exploring the potential in lentil accessions. A set of 25 lentil accessions was evaluated in two seasons across the three locations and genotyped by using 40 simple sequence repeat (SSR) markers that are linked with lentil iron and zinc concentrations. Out of the 40 SSR markers, 23 markers were found polymorphic while 12 were monomorphic, and 5 markers were null. These 23 polymorphic markers produced a total of 584 alleles, of which 52 were polymorphic alleles, and average alleles per locus was 11.49. The linkage disequilibrium (LD) analysis was done using a mixed linear model (MLM) that identified three SSR markers, PBALC 13, PBALC 206, and GLLC 563, associated with grain Fe concentration, explaining 9% to 11% phenotypic variation, respectively, and four SSR markers (PBALC 353, SSR 317–1, PLC 62, and PBALC 217) associated with grain Zn concentration, explaining 14% to 21% phenotypic variation, respectively. The pairwise genetic similarity index among 25 lentil accessions varied from 0.16 to 0.83. The identified SSRs exhibited consistent performance across two seasons and have potential for utilization in lentil molecular breeding program. SAARC J. Agric., 21(2): 27-40 (2023)

Extraction of Lignin from Agro-Waste Coir Fiber by Mild Alkali Treatment: A Statistical Approach for Process Optimization through Response Surface Methodology

Lignin, a biomass with a wide range of applications, can be produced from agro-industrial waste, which can contributes to a reduction in the costs of production as well as the pollution load from the environment. The lignin content in coconut coir fiber is fairly high (40-45%) compared to other biomass. In current study, lignin is extracted from coconut coir fiber using a mildly alkaline solution and moist heat under pressure in an autoclave. Three factors were taken into consideration while designing the experiments: the variation in NaOH concentration, the variation in time and the variation in temperature. The optimal lignin extraction of 305.9742 mg/100 mL was achieved at 107 ºC and a heating time of 130 min by using a central composite design (CCD) of the response surface methodology (RSM).

Comparation of n-Heksan and Etanol in Bawang Dayak (Elutherine palmifolia L. Merr) Extraction for Inhibiting Pseudomonas aeruginosa

Pseudomonas aeruginosa is one of the bacteria that causes nosocomial infections. The incidence of nosocomial infections caused by Pseudomonas aeruginosa is around 10-15%. Nosocomial infections caused by these bacteria are increasingly difficult to treat. This happens because more and more strains are resistant to several antibiotics (Multidrug Resistance), so the selection of antibiotics against Pseudomonas aeruginosa is very difficult. This study aims to determine and analyze the effect of using polar and nonpolar solvents on Dayak onion bulb extract on the inhibitory ability of Pseudomonas aeruginosa. The method used in this study was Kirby-Bauer disk diffusion using 8 sample and 5 replication with assay solvent 96% ethanol and n-hexane extract of Dayak onion bulbs (Eleutherine palmifolia L. Merr) with concentration variations of 75%, 80%, and 85%. Positive control used ciprofloxacin 5 µg and positive control DMSO 10%. The results showed that on phytochemical screening of solvent ethanol 96% contained flavonoids and n-hexane contained triterpenoids. Ethanol 96% solvent obtained a higher presentase yield than n-heksan solvents and the highest inhibition zone diameter was 85% concentration in 96% ethanol solvent. The results of statistical analysis with Mann Whitney test showed a significant difference between the treatment groups (p&lt;0.05).