Recent Advances in Natural Sciences最新文献

Antibiosis and GC-MS of secondary metabolites of rhizosphere bacteria from Manatee foodplants in the humic freshwater ecosystem of Eniong river, Nigeria 尼日利亚埃尼昂河腐殖质淡水生态系统中海牛食料植物根瘤菌的抗生素和 GC-MS 二级代谢物研究

Recent Advances in Natural Sciences Pub Date : 2024-06-12 DOI: 10.61298/rans.2024.2.1.68

O. Fatunla, J. P. Essien, B. N. Ita, N. Asamudo, J. Ekong, O. U. M. John, N. A. Abraham

{"title":"Antibiosis and GC-MS of secondary metabolites of rhizosphere bacteria from Manatee foodplants in the humic freshwater ecosystem of Eniong river, Nigeria","authors":"O. Fatunla, J. P. Essien, B. N. Ita, N. Asamudo, J. Ekong, O. U. M. John, N. A. Abraham","doi":"10.61298/rans.2024.2.1.68","DOIUrl":"https://doi.org/10.61298/rans.2024.2.1.68","url":null,"abstract":"Microorganisms are able to synthesize secondary metabolites of various structures and bioactivities. These metabolites are produced to help the organism compete successfully with other organisms in their natural habitat and adapt with changing environmental milieu. The ability of rhizosphere bacteria (Bacillus subtilis NC_000964.3 and Pseu-domonas aeruginosa NC_002516.2) isolated from the rhizospheric soil of Manatee food plants Mimosa pygra, Ipomeoa aquatica and Pistia stratoites to inhibit the growth of human pathogens (P. aeruginosa, E. coli, S. aureus and B. subtilis) was evaluated using standard methods. It was observed that the growth extracts of B. subtilis strains M5, M8 and P7 and P. aeruginosa strains I3 and M9 contained useful bioactive compound. GC-MS analysis of the cell -free methanol extract of the antibiotic producing bacterial strains was also evaluated and the results showed that their inhibitory potentials against bacterial pathogens are due to the presence of phenylethyl alcohol, 2-ethyl-4-methyl-1,3-dioxolane, bicyclo [4.2.0] octa-1,3,5-triene and 4-amino-2-methyl-5,6-dimethyl pyrimidine for B. subtilis and 3,4-dimethyl tetrahydrofuran, 4,6-dimethyl-4-hydroxy-5- heptenoic acid and 2,4-dimethyl-4-heptanol for Pseudomonas aeruginosa. These strains of rhizosphere bacteria may be exploited to produce new antibiotics.","PeriodicalId":478520,"journal":{"name":"Recent Advances in Natural Sciences","volume":"67 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141350552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geothermal parameter assessment in the Southwestern Sokoto Basin, Nigeria, using spectral analysis (centroid method) 利用光谱分析（中心点法）评估尼日利亚索科托盆地西南部的地热参数

Recent Advances in Natural Sciences Pub Date : 2024-06-12 DOI: 10.61298/rans.2024.2.1.47

U. Z. Magawata, N. Olasunkanmi, T. A. Issa

{"title":"Geothermal parameter assessment in the Southwestern Sokoto Basin, Nigeria, using spectral analysis (centroid method)","authors":"U. Z. Magawata, N. Olasunkanmi, T. A. Issa","doi":"10.61298/rans.2024.2.1.47","DOIUrl":"https://doi.org/10.61298/rans.2024.2.1.47","url":null,"abstract":"This study utilized spectral analysis (centroid method) to assess geothermal parameters in the southwestern part of the Sokoto Basin, Nigeria. The high-resolution airborne data comprised forty-nine (49) overlapping blocks, and each block was divided into 55x55 km to evaluate essential parameters such as depth to the top boundary (Zt ), centroiddepth (Zo), and magnetic source bottom (Zb = 2Zo-Zt ). The analysis revealed variable Curie points depths (CPD), ranging from 3.89 km to 26.56 km. The lowest CPD is primarily associated with basement rocks within anomalies A, B, C, D, E, F, G, H, and I, with an average CPD of 9.16 km. Furthermore, the thermal gradients ranged from 21.84 ◦C/km to 149.10 ◦C/km, with an average thermal gradient of 73.30 ◦C/km. The heat flow exhibited variations between 54.81 mW/m² and 374.24 mW/m², with average heat flow of 180.4 mW/m², indicating significant geothermal potential zones. The high thermal gradients and heat flow regions were identified, around anomalies A, B, and C. Additionally, temperature gradients identified at shallow depths ranged from 110 ◦C/km to 150 ◦C/km. The results reveal the presence of high-temperature points and anomalous geothermal potentials, particularly within anomalies A, B, and C, thus requiring further for sustainable geothermal energy generation in the study area.","PeriodicalId":478520,"journal":{"name":"Recent Advances in Natural Sciences","volume":"80 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141352823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spectral analysis of aeromagnetic data over parts of Southwestern Nigeria 尼日利亚西南部部分地区气磁数据的频谱分析

Recent Advances in Natural Sciences Pub Date : 2024-02-09 DOI: 10.61298/rans.2024.2.1.53

Emmanuel Ike, A. S. Oniku, S. Ezike, Rodney Ewusi-Wilson

{"title":"Spectral analysis of aeromagnetic data over parts of Southwestern Nigeria","authors":"Emmanuel Ike, A. S. Oniku, S. Ezike, Rodney Ewusi-Wilson","doi":"10.61298/rans.2024.2.1.53","DOIUrl":"https://doi.org/10.61298/rans.2024.2.1.53","url":null,"abstract":"This study endeavors to assess spectral depths, explore Basement structure variability, and deduce geothermal heat distribution by determining Curie point depth (Zb) through aeromagnetic data analysis across 14 sheets in Southwestern Nigeria. The depths to the shallow magnetic source (Zt) range from 0.14286 km to 1.02632 km, indicating sediment thickness, with the deepest point situated in the Northwestern region and progressively shallower towards the central and Southern portions of the study area. Depths to the deeper magnetic source (Z0) span from 1.08333 km in the North-central part to 3.23529 km in the Southwestern part. The primary sources of the first layer (Zt) depth are intrusions/outcropping Basement rocks, while the second layer (Z0) results from the intrusion of magnetic rocks into the basement, intra-Basement fissures, and deeper magma intrusions below the bedrock. Curie point depth ranges from 1.87380 km to 6.25629 km, with the North-central region exhibiting the shallowest depths, followed by the Northeast, Northwest, and Southeast. Shallow Curie point depth is attributed to magma upwelling and magmatic intrusion in highly fractured quartzite units and older granite units, while deeper Curie point in the Southwestern part may result from isostatic compensation/recovery. Given that Curie point depths are shallower than 10 km, the study area holds geothermal resource potential, particularly in the North-central region. The correlation between estimated spectral depths from aeromagnetic data and observed geothermal signatures in the study area promises to be advantageous in the pursuit of alternative energy generation, potentially mitigating the effects of global warming.","PeriodicalId":478520,"journal":{"name":"Recent Advances in Natural Sciences","volume":" 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139787698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spectral analysis of aeromagnetic data over parts of Southwestern Nigeria 尼日利亚西南部部分地区气磁数据的频谱分析

Recent Advances in Natural Sciences Pub Date : 2024-02-09 DOI: 10.61298/rans.2024.2.1.53

Emmanuel Ike, A. S. Oniku, S. Ezike, Rodney Ewusi-Wilson

{"title":"Spectral analysis of aeromagnetic data over parts of Southwestern Nigeria","authors":"Emmanuel Ike, A. S. Oniku, S. Ezike, Rodney Ewusi-Wilson","doi":"10.61298/rans.2024.2.1.53","DOIUrl":"https://doi.org/10.61298/rans.2024.2.1.53","url":null,"abstract":"This study endeavors to assess spectral depths, explore Basement structure variability, and deduce geothermal heat distribution by determining Curie point depth (Zb) through aeromagnetic data analysis across 14 sheets in Southwestern Nigeria. The depths to the shallow magnetic source (Zt) range from 0.14286 km to 1.02632 km, indicating sediment thickness, with the deepest point situated in the Northwestern region and progressively shallower towards the central and Southern portions of the study area. Depths to the deeper magnetic source (Z0) span from 1.08333 km in the North-central part to 3.23529 km in the Southwestern part. The primary sources of the first layer (Zt) depth are intrusions/outcropping Basement rocks, while the second layer (Z0) results from the intrusion of magnetic rocks into the basement, intra-Basement fissures, and deeper magma intrusions below the bedrock. Curie point depth ranges from 1.87380 km to 6.25629 km, with the North-central region exhibiting the shallowest depths, followed by the Northeast, Northwest, and Southeast. Shallow Curie point depth is attributed to magma upwelling and magmatic intrusion in highly fractured quartzite units and older granite units, while deeper Curie point in the Southwestern part may result from isostatic compensation/recovery. Given that Curie point depths are shallower than 10 km, the study area holds geothermal resource potential, particularly in the North-central region. The correlation between estimated spectral depths from aeromagnetic data and observed geothermal signatures in the study area promises to be advantageous in the pursuit of alternative energy generation, potentially mitigating the effects of global warming.","PeriodicalId":478520,"journal":{"name":"Recent Advances in Natural Sciences","volume":"17 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139847680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Copper catalysis the synthesis of functionalized glycine-based sulphonamides: In silico and in vitro antibacterial studies 铜催化合成功能化甘氨酸基磺酰胺：硅学和体外抗菌研究

Recent Advances in Natural Sciences Pub Date : 2024-02-05 DOI: 10.61298/rans.2024.2.1.36

A. D. Jacob, U. C. Okoro, A. J. Dauda

{"title":"Copper catalysis the synthesis of functionalized glycine-based sulphonamides: In silico and in vitro antibacterial studies","authors":"A. D. Jacob, U. C. Okoro, A. J. Dauda","doi":"10.61298/rans.2024.2.1.36","DOIUrl":"https://doi.org/10.61298/rans.2024.2.1.36","url":null,"abstract":"The synthesis of functionalized glycine-based sulphonamides via copper catalyzed N-arylation reaction and the in silico, in vitro antibacterial studies is reported. The procedure involved the initial synthesis of substituted p-toluenesulphonamides and substituted benzenesulphonamides by the reaction of glycine with p-toluenesulphonyl chloride and benzenesulphonyl chloride respectively in aqueous basic medium. The syn[1]thesized compounds were acetylated by reacting them with acetic anhydride and sodium acetate followed by acylation and amidation to yield amidated p-toluenesulphonamides and benzenesulphonamides respectively. Copper catalyzed N-arylation of the amidated products with aryltriolborates resulted in the synthesis of benzene, and 2-chlorophenyl derivatives of the amidated products. The synthesized compounds were characterized using FTIR, 1HNMR and elemental analysis and the spectra were in agreement with the assigned structures. The in silico antibacterial studies revealed that the compounds possess significant antibacterial potency in the respective bacteria cells and could be further employed as potential anti-bacterial agents. The in vitro antimicrobial study revealed that most of the synthesized compounds possess antibacterial activities.\u0000 ","PeriodicalId":478520,"journal":{"name":"Recent Advances in Natural Sciences","volume":"46 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139864497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Copper catalysis the synthesis of functionalized glycine-based sulphonamides: In silico and in vitro antibacterial studies 铜催化合成功能化甘氨酸基磺酰胺：硅学和体外抗菌研究

Recent Advances in Natural Sciences Pub Date : 2024-02-05 DOI: 10.61298/rans.2024.2.1.36

A. D. Jacob, U. C. Okoro, A. J. Dauda

{"title":"Copper catalysis the synthesis of functionalized glycine-based sulphonamides: In silico and in vitro antibacterial studies","authors":"A. D. Jacob, U. C. Okoro, A. J. Dauda","doi":"10.61298/rans.2024.2.1.36","DOIUrl":"https://doi.org/10.61298/rans.2024.2.1.36","url":null,"abstract":"The synthesis of functionalized glycine-based sulphonamides via copper catalyzed N-arylation reaction and the in silico, in vitro antibacterial studies is reported. The procedure involved the initial synthesis of substituted p-toluenesulphonamides and substituted benzenesulphonamides by the reaction of glycine with p-toluenesulphonyl chloride and benzenesulphonyl chloride respectively in aqueous basic medium. The syn[1]thesized compounds were acetylated by reacting them with acetic anhydride and sodium acetate followed by acylation and amidation to yield amidated p-toluenesulphonamides and benzenesulphonamides respectively. Copper catalyzed N-arylation of the amidated products with aryltriolborates resulted in the synthesis of benzene, and 2-chlorophenyl derivatives of the amidated products. The synthesized compounds were characterized using FTIR, 1HNMR and elemental analysis and the spectra were in agreement with the assigned structures. The in silico antibacterial studies revealed that the compounds possess significant antibacterial potency in the respective bacteria cells and could be further employed as potential anti-bacterial agents. The in vitro antimicrobial study revealed that most of the synthesized compounds possess antibacterial activities.\u0000 ","PeriodicalId":478520,"journal":{"name":"Recent Advances in Natural Sciences","volume":"90 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139804402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic properties of binary mixtures of methyl acetate and some selected ketonesat varying compositions and temperatures 不同成分和温度下醋酸甲酯与某些选定酮的二元混合物的热力学性质

Recent Advances in Natural Sciences Pub Date : 2023-12-05 DOI: 10.61298/rans.2023.1.2.13

G. Cookey, Ngozi J. Maduelosi, Edikan A. Udo

{"title":"Thermodynamic properties of binary mixtures of methyl acetate and some selected ketonesat varying compositions and temperatures","authors":"G. Cookey, Ngozi J. Maduelosi, Edikan A. Udo","doi":"10.61298/rans.2023.1.2.13","DOIUrl":"https://doi.org/10.61298/rans.2023.1.2.13","url":null,"abstract":"Density and viscosity measurements of binary mixtures of methyl acetate with propanone, butan-2-one and pentan-2-one were carried out at varying compositions (0 to 1) of methyl acetate and temperatures of 25, 30, 35 and 40◦C. The experimental data obtained were correlated with the Redlich-Kister polynomial equation from where excess molar volumes (VE ), excess viscosities (ηE), excess Gibbs free energies of activation for viscous flow (ΔG*E ), fitting coefficients and standard deviations of the mixtures were calculated. The ηE values were positive for mixtures of butan-2-one and pentan-2-one at all compositions and temperatures but gradually decrease with increasing composition and temperature. The mixtures of methyl acetate with propanone showed negative values of excess viscosity at all compositions of methyl acetate. The negative values are observed to be directly proportional to temperature. The values of VE for mixtures of methyl acetate + propanone system display positive deviations at lower compositions (0-0.4) and negative for higher mole fractions. The excess molar volumes of mixtures of butan-2-one and pentan-2-one are negative at the studied compositions and temperatures with a minimum at 0.3 composition and subsequent gradual decrease in negativity with increasing composition. The excess Gibbs free energy of activation for viscous flow (ΔG*E ) are positive at all compositions and temperatures and reaches a maximum at 0.3 composition above which it decreases. These results have been interpreted on the basis of the type and nature of interactions as well as differences in molecular architecture between the solvent mixtures.\u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 ","PeriodicalId":478520,"journal":{"name":"Recent Advances in Natural Sciences","volume":"88 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138600299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0