Universitas Scientiarum最新文献_第5页

Some interactions between Hopf Galois extensions and noncommutative rings Hopf伽罗瓦扩展与非交换环之间的一些相互作用

Universitas Scientiarum Pub Date : 2021-03-23 DOI: 10.11144/Javeriana.SC271.sibh

Fabio Calder'on, A. Reyes

引用次数: 1

Surface-enhanced Raman Spectroscopy and Density Functional Theory Study of Glyphosate and Aminomethylphosphonic acid Using Silver Capped Silicon Nanopillars 用银包覆硅纳米柱研究草甘膦和氨基甲基膦酸的表面增强拉曼光谱和密度泛函理论

Universitas Scientiarum Pub Date : 2021-01-01 DOI: 10.11144/javeriana.sc26-1.srsa

J. Castillo, Ciro E. Rozo, Kaiyu Wu, T. Rindzevicius, A. Boisen

{"title":"Surface-enhanced Raman Spectroscopy and Density Functional Theory Study of Glyphosate and Aminomethylphosphonic acid Using Silver Capped Silicon Nanopillars","authors":"J. Castillo, Ciro E. Rozo, Kaiyu Wu, T. Rindzevicius, A. Boisen","doi":"10.11144/javeriana.sc26-1.srsa","DOIUrl":"https://doi.org/10.11144/javeriana.sc26-1.srsa","url":null,"abstract":"Glyphosate (GP) is a broad-spectrum systemic herbicide which is used for killing a wide variety of harmful plants. Several recent studies indicate possible adverse health effects on humans. This work is focused on detection and adsorption studies of GP and its metabolite aminomethylphosphonic acid (AMPA) on silver-capped silicon nanopillars using surface-enhanced Raman spectroscopy (SERS). Density Functional Theory with the B3LYP functional was employed for the geometry optimization of ground state geometries and simulation of Raman and SERS spectra of the GP and AMPA. The theoretically calculated and experimentally observed vibrations of GP and AMPA free and attached to the Ag surface exhibited different Raman spectra revealing chemical interactions between the analysed molecules and the metal surface. DFT studies confirmed that the main Ag-GP interaction is with the oxygen from carboxylic and phosphate groups, andfor AMPA the main interaction is via a strong interaction between nitrogen from NH with the metal surface. In order to study the binding behavior, adsorption isotherm analysis between GP and AMPA on silver-capped silicon nanopillars (AgNPs) were performed. Finally, the obtained isotherms for GP and AMPA followed a negative cooperative binding mechanism.","PeriodicalId":39200,"journal":{"name":"Universitas Scientiarum","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63511075","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: 2

Synthesis and characterization of four N-acylhydrazones as potential O,N,O donors for Cu2+: An experimental and theoretical study 四个N-酰基腙作为Cu2+的O,N,O给体的合成与表征:实验与理论研究

Universitas Scientiarum Pub Date : 2021-01-01 DOI: 10.11144/javeriana.sc26-2.saco

Dorian Polo-Cerón, María Mercedes Hincapié-Otero, Andrey Joaqui-Joaqui

引用次数: 1

Extension of Dasgupta’s Technique for Higher Degree Approximation Dasgupta高次逼近技术的推广

Universitas Scientiarum Pub Date : 2021-01-01 DOI: 10.11144/javeriana.sc26-2.eodt

P. Powar, Rishabh Tiwari, V. Mishra

引用次数: 2

Assessment of lignocellulosic residues from Northern Patagonian Andes (Argentina) for cultivation of Pleurotus ostreatus 北巴塔哥尼亚安第斯山脉(阿根廷)种植平菇的木质纤维素残留物的评价

Universitas Scientiarum Pub Date : 2021-01-01 DOI: 10.11144/javeriana.sc262.aolr

M. Rugolo, Juan Manuel Roggero-Luque, M. Rajchenberg, C. Barroetaveña

{"title":"Assessment of lignocellulosic residues from Northern Patagonian Andes (Argentina) for cultivation of Pleurotus ostreatus","authors":"M. Rugolo, Juan Manuel Roggero-Luque, M. Rajchenberg, C. Barroetaveña","doi":"10.11144/javeriana.sc262.aolr","DOIUrl":"https://doi.org/10.11144/javeriana.sc262.aolr","url":null,"abstract":"This work evaluated mycelial growth rate (Kr) and fruiting of two Pleurotus ostreatus commercial strains (A01, 129) on formulations composed of lignocellulosic residues from farming and agroindustry of Northern Patagonian Andes, and of woody materials from invasive plants. Rosehip fluffs (RF), rosehip woodchips (RWC), southern beech wood shavings (SBWS), wheat straw (WS), and willow woodchips (WWC) were used as base substrates, and brewing bagasse (BB) as an alternative supplement to wheat bran (WB). Kr was higher in WS-WB and WS-BB for both strains. Experiments in fruiting chambers showed biological efficiencies (BEs) above 40% in WS-BB (both strains) and WS-WB (strain 129). Formulations using RWC or WWC gave BEs under 40%, while those composed of SBWS or RF showed lower Kr and contamination by moulds. Medium-scale fruiting experiments using strain A01 showed the highest BEs in WS-BB and RWC-WB. These results suggest that WS is the best substrate for Pleurotus ostreatus culture, although scarce in Northern Patagonian Andes. Nevertheless, WWC and RWC are suggested as alternative substrates, while BB is cheap and abundant, suitable as an alternative supplement to WB.","PeriodicalId":39200,"journal":{"name":"Universitas Scientiarum","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63511122","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: 2

Molecular techniques for the assessment of Cr (VI) reduction by Bacillus thuringiensis 苏云金芽孢杆菌还原Cr (VI)的分子技术研究

Universitas Scientiarum Pub Date : 2021-01-01 DOI: 10.11144/javeriana.sc26-2.mtft

Deisy L. Guerrero-Ceballos, E. Ibargüen-Mondragón, P. Fernández-Izquierdo, Jhonatan Pinta-Melo, E. M. Burbano-Rosero

{"title":"Molecular techniques for the assessment of Cr (VI) reduction by Bacillus thuringiensis","authors":"Deisy L. Guerrero-Ceballos, E. Ibargüen-Mondragón, P. Fernández-Izquierdo, Jhonatan Pinta-Melo, E. M. Burbano-Rosero","doi":"10.11144/javeriana.sc26-2.mtft","DOIUrl":"https://doi.org/10.11144/javeriana.sc26-2.mtft","url":null,"abstract":"Effluent pollution with Cr (VI) is a worldwide environmental problem. In the Pasto River (southeastern, Colombia), previous studies reported contamination with this metal at points near tanneries. To establish the role of Bacillus thuringiensis in Cr (VI) reduction in water from Pasto River, experiments were carried out with untreated Pasto River water (treatment 1), sterile Pasto River water inoculated with B. thuringiensis (treatment 2), and unsterilized Pasto River water inoculated with B. thuringiensis (treatment 3). All experiments were conducted in bioreactors with a controlled temperature of 20 °C and constant agitation for 156 h. Samples of 20 mL were taken every 12 h from each treatment to track Cr (VI) reduction levels and to confirm microorganism identity via molecular methods involving denaturing gradient gel electrophoresis (DGGE), restriction enzyme digestion profiles (RFLP), and bioinformatic analysis. Cr (VI) reduction was higher in treatment 3 (99:42 %) as opposed to treatment 2 (76:12 %) and treatment 1 (74:46 %). The molecular identity of B. thuringiensis was determined via sequencing of the 16SrRNA gene, and RFLP assessments in all three treatments revealed B. thuringiensis profiles. Since B. thuringiensis was present in all three treatments trough time, Cr (VI) reduction can be attributed to this bacterium.","PeriodicalId":39200,"journal":{"name":"Universitas Scientiarum","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63511177","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

An investigation on using measurement uncertainty as decision rule for statement of conformity 用测量不确定度作为合格评定决策准则的探讨

Universitas Scientiarum Pub Date : 2021-01-01 DOI: 10.11144/javeriana.sc26-2.aiou

Gouda Mohamed, R. Hegazy

引用次数: 0

Biofilm and persister cell fomation variability in clinical isolates of Klebsiella pneumoniae in Colombia 哥伦比亚肺炎克雷伯菌临床分离株的生物膜和持久性细胞形成变异性

Universitas Scientiarum Pub Date : 2020-12-31 DOI: 10.11144/JAVERIANA.SC25-3.BAPC

Leonardo Posada, I. Acosta, L. Zárate, P. Rodríguez, M. G. Huertas, M. Zambrano

{"title":"Biofilm and persister cell fomation variability in clinical isolates of Klebsiella pneumoniae in Colombia","authors":"Leonardo Posada, I. Acosta, L. Zárate, P. Rodríguez, M. G. Huertas, M. Zambrano","doi":"10.11144/JAVERIANA.SC25-3.BAPC","DOIUrl":"https://doi.org/10.11144/JAVERIANA.SC25-3.BAPC","url":null,"abstract":"Klebsiella pneumoniae is an opportunistic pathogen associated with nosocomial infections. Persister cells are a fraction of a bacterial population that can escape antibiotic treatment and are associated with antibiotic therapy failure. In this work, we analyzed persistent cells in planktonic cultures and biofilms using10 K. pneumoniae clinical isolates and four different antibiotic types. The isolates had different antibiotic susceptibility profiles that did not correlate with their capacity to form biofilms. Persister cells were found under all conditions tested, although their population numbers varied depending on the antibiotic used. A larger number of persister cells were found in biofilms than in planktonic cultures. Antibiotic treatment with trimethoprim-sulfamethoxazole resulted in the largest persister cell sub-population compared with other antibiotics tested, while ciprofloxacin was the antibiotic that produced fewer persister cells. These results indicate that K. pneumoniae clinical isolates vary not only in their susceptibility to antibiotics but also in properties relevant to diseases, such as biofilm formation and persister cell populations.","PeriodicalId":39200,"journal":{"name":"Universitas Scientiarum","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41593201","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

Seed bank responses after clearcutting Pinus patula plantations in Andean high montane areas 安第斯高山地区赤松人工林砍伐后的种子库反应

Universitas Scientiarum Pub Date : 2020-12-31 DOI: 10.11144/JAVERIANA.SC25-3.SBRA

Sofía Basto, L. Roa-Fuentes, A. Moreno, J. I. Barrera-Cataño

{"title":"Seed bank responses after clearcutting Pinus patula plantations in Andean high montane areas","authors":"Sofía Basto, L. Roa-Fuentes, A. Moreno, J. I. Barrera-Cataño","doi":"10.11144/JAVERIANA.SC25-3.SBRA","DOIUrl":"https://doi.org/10.11144/JAVERIANA.SC25-3.SBRA","url":null,"abstract":"Clear cutting exotic plantations favours natural regeneration processes in which seed banks may play an important role. In Andean high montane areas, after Pinus patula clear cutting, changes in soil pH and litter lead to increased fauna and flora biodiversity. However, the impactof these changes on seed banks remains unknown. The aims of the present study were to understand how seed bank richness, abundance, and composition changes after p. patula clear cutting, and to identify the role of above ground cover, pH and litter cover on these seed bank variations. The study was conducted in three areas with different post-clear cutting ages (0,2.5,4.5 years), a p. patula plantation and in a high Andean forest patch. All these sites were located between 3033 and 3100 m.a.s.l. Seed bank abundance, richness and the number of seeds of the ten most abundant species increased in areas with 2.5 and 4.5 years after clear cutting. Moreover, seed bank composition was different among study areas. These changes were related to increasing above ground vegetation cover and soil pH, and to decreasing litter cover. Seed banks contributed almost exclusively to the recovery of some herbaceous species; were corded only one tree species recruit from the seed banks (Baccharislatifolia) in the forest soils; therefore, the natural regeneration processes may be constrained. Our results high light the need to implement active restoration to accelerate high montane forest recovery in areas previously covered with pine tree plantations.","PeriodicalId":39200,"journal":{"name":"Universitas Scientiarum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41711121","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: 1

Medium and large-sized mammals in dry forests of the Colombian Caribbean 哥伦比亚加勒比海干旱森林中的中型和大型哺乳动物

Universitas Scientiarum Pub Date : 2020-12-30 DOI: 10.11144/JAVERIANA.SC25-3.MALS

Simón Pineda-Cendales, Elkin Hernández-Rolong, Juan E. Carvajal‑Cogollo

{"title":"Medium and large-sized mammals in dry forests of the Colombian Caribbean","authors":"Simón Pineda-Cendales, Elkin Hernández-Rolong, Juan E. Carvajal‑Cogollo","doi":"10.11144/JAVERIANA.SC25-3.MALS","DOIUrl":"https://doi.org/10.11144/JAVERIANA.SC25-3.MALS","url":null,"abstract":"Mammalian populations are fundamental at functional and ecological levels within ecosystems and are inconstant threat of reduction world wide and in the Neotropic. We evaluated population variables, habitat use, and threats to medium and large mammals (weight > 1 kg) in the terrestrial part of the Tayrona National Natural Park (Santa Marta-Colombia). We carried out in direct annual observations with camera traps between 2012 and 2017, both in rainy and dry seasons. We estimated the richness, relative abundance (RAI), and functional diversity of the mammals present in the area. We recorded 15 species, distributed in seven orders (Carnivora, Rodentia, Pilosa, Cingulata, Lagomorpha, Didelphimorphia, and Cetartiodactyla), 11 families and 13 genera. The species with the highest capture frequency was Dasyprocta punctata (142, RAI = 0.85), followed by Cuniculus paca (56, RAI = 0.33), Odocoileus virginianus (51, RAI = 0.30), and Cerdocyon thous (41, RAI = 0.24). We observed a marked use and preference of habitat in the seasonal dry ever green forest. This finding coincides with the highest value of functional richness (S1= 293.88) for this ecosystem, probably due to its features, such as green vegetation and abundant water streams. Our results reveal stability of the species richness across the years studied, suggesting good health of the mammal populations in the studied area.","PeriodicalId":39200,"journal":{"name":"Universitas Scientiarum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44624814","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: 2