Universitas Scientiarum最新文献_第6页

Synthesis of zeolites P and evaluation of their activity as new and reusable heterogeneous catalysts in a three-component ABB’ Povarov model reaction 沸石P的合成及其在三组分ABB’Povarov模型反应中作为新的可重复使用的多相催化剂的活性评价

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

Jefersson A. López, R. Toro, A. R. Bohórquez, J. H. Quintana, J. Henao

引用次数: 0

Diurnal physiological behavior of seedlings in the Amazon rainforest: generalist versus specialist species of shade and sun 亚马逊雨林幼苗的昼夜生理行为：遮荫和阳光的多面手与专业物种

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

Carolina Ramos-Montaño, L. J. Vanegas-Cano, Nancy Milena Cárdenas-Avella, Karen Lizeth Pulido-Herrera, Sindy Paola Buitrago-Puentes

{"title":"Diurnal physiological behavior of seedlings in the Amazon rainforest: generalist versus specialist species of shade and sun","authors":"Carolina Ramos-Montaño, L. J. Vanegas-Cano, Nancy Milena Cárdenas-Avella, Karen Lizeth Pulido-Herrera, Sindy Paola Buitrago-Puentes","doi":"10.11144/JAVERIANA.SC25-3.DPBO","DOIUrl":"https://doi.org/10.11144/JAVERIANA.SC25-3.DPBO","url":null,"abstract":"The regenerative success of generalist and specialist species may be due to differences in their physiology. Measurements of stomatal conductance (gS) provide an efficient way to infer immediate physiological responses of plants to diurnal environment variation. Radiation, air temperature, and relative humidity were measured in the Colombian Amazon rainforest, to identify the extreme environmental conditions that limit the gS of seedlings in three site types: small gap, open forest, and closed forest. We hypothesized that the diurnal physiological performance of generalist species must be plastic in these three environments. Morphological traits, gS, and leaf temperature were evaluated in seedlings of four species: one generalist, common to all sites, and one specialist from each site. The gap site was warmer and more irradiated than the other two sites, which caused several midday physiological depressions, limited seedling survival, and facilitated the specialized strategy. Leaf and air temperatures were strong determinants of overall gS. The generalist species was physiologically plastic and, at some hours of the day, more efficient than the specialists from open forest andclosed forests. This factor interplay could allow the coexistence of both types of plants.","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":"47761847","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

Characterization of antibiotic-resistant Escherichia coli associated with urinary tract infections in Southern Colombia 哥伦比亚南部与尿路感染相关的抗生素耐药性大肠杆菌的特征

Universitas Scientiarum Pub Date : 2020-12-22 DOI: 10.11144/JAVERIANA.SC25-3.COAR

Deisy Lorena Guerrero Ceballos, Edith Mariela Burbano Rosero, E. Ibargüen-Mondragón

{"title":"Characterization of antibiotic-resistant Escherichia coli associated with urinary tract infections in Southern Colombia","authors":"Deisy Lorena Guerrero Ceballos, Edith Mariela Burbano Rosero, E. Ibargüen-Mondragón","doi":"10.11144/JAVERIANA.SC25-3.COAR","DOIUrl":"https://doi.org/10.11144/JAVERIANA.SC25-3.COAR","url":null,"abstract":"Bacterial resistance to antibiotics is one of the largest medical concerns worldwide.One of the bacteria of critical priority is E. coli, since it presents different resistance mechanisms and some of its strains have evolved resistance to beta-lactam antibiotics. We characterized 32 antibiotic resistant bacterial isolates from confirmed cases of urinary tract infections from an array of patients in Nariño, southern Colombia. Macro and microscopic descriptions of the 32 clinical isolates were conducted. Resistance profiles, biochemical, and molecular characterization (via 16S rRNA gene sequencing, ERIC-PCR, and resistance genes) were performed. All the isolates were identified as E. coli and had resistance to beta-lactams, aminoglycosides, and fluoroquinolones. This resistance was related to plasmids carryingthebla TEM, blaSHV1, and blaCTXM1genes.There were significant differences between the resistance proportions of the samples (p value:0.0000), mainly to penicillin, cefotoxin, and imipenem. Using ERIC-PCR, four clonal states were evidenced that corroborate a degree of genetic differentiation with in the isolate set.Antibiotic resistance observed in the isolates is associated with resistance genes present in the bacterial chromosome and plasmids.","PeriodicalId":39200,"journal":{"name":"Universitas Scientiarum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44803810","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: 3

Effect of pH on the growth of three lactic acid bacteria strains isolated from sour cream pH对酸奶油中三株乳酸菌生长的影响

Universitas Scientiarum Pub Date : 2020-11-06 DOI: 10.11144/JAVERIANA.SC25-2.EOPO

Madalyd Yurani Vera-Peña, Wendy Lizeth Rodriguez-Rodriguez

引用次数: 3

Product of deferred Cesàro and deferred weighted statistical probability convergence and its applications to Korovkin-type theorems 延迟Cesàro与延迟加权统计概率收敛的乘积及其在Korovkin型定理中的应用

Universitas Scientiarum Pub Date : 2020-10-27 DOI: 10.11144/JAVERIANA.SC25-3.PODC

B. Jena, S. K. Paikray

{"title":"Product of deferred Cesàro and deferred weighted statistical probability convergence and its applications to Korovkin-type theorems","authors":"B. Jena, S. K. Paikray","doi":"10.11144/JAVERIANA.SC25-3.PODC","DOIUrl":"https://doi.org/10.11144/JAVERIANA.SC25-3.PODC","url":null,"abstract":"In the present work, we introduce and study the notion of statistical probability convergence for sequences of random variables as well as the idea of statistical convergence for sequences of real numbers, which are defined over a Banach space via the product of deferred Cesàro and deferred weighted summability means. We first establish a theorem presenting aconnection between them. Based upon our proposed methods, we then prove a Korovkin-type approximation theorem with algebraic test functions for a sequence of random variables on a Banach space, and demonstrate that our theorem effectively extends and improves most (if not all) of the previously existing results (in classical as well as in statistical versions). Furthermore, an illustrative example is presented here by means of the generalized Meyer–König and Zeller operators of a sequence of random variables in order to demonstrate that our established theorem is stronger than its traditional and statistical versions. Finally, we estimate the rate of the product of deferred Cesàro and deferred weighted statistical probability convergence, and accordingly establish a new result.","PeriodicalId":39200,"journal":{"name":"Universitas Scientiarum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48520130","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: 7

Gut bacteria comparison between wild and captive neotropical otters 野生和圈养新热带水獭肠道细菌的比较

Universitas Scientiarum Pub Date : 2020-10-02 DOI: 10.11144/JAVERIANA.SC25-2.GBCB

Johanna Santamaría-Vanegas, L. C. Rodríguez-Rey

引用次数: 1

Biogenic amines in rainbow trout, tilapia, and cachama fish, available for consumption in Nariño, southern Colombia 虹鳟鱼、罗非鱼和梭鱼中的生物胺，可在哥伦比亚南部Nariño消费

Universitas Scientiarum Pub Date : 2020-09-28 DOI: 10.11144/javeriana.sc25-2.bair

J. Lozada-Castro, David Arturo-Perdomo, Angie Pardo-Rueda

{"title":"Biogenic amines in rainbow trout, tilapia, and cachama fish, available for consumption in Nariño, southern Colombia","authors":"J. Lozada-Castro, David Arturo-Perdomo, Angie Pardo-Rueda","doi":"10.11144/javeriana.sc25-2.bair","DOIUrl":"https://doi.org/10.11144/javeriana.sc25-2.bair","url":null,"abstract":"Biogenic amines (BAs) are low molecular weight nitrogenous compounds, formed by the breakdown of proteins in highly perishable food products such as fish. BAs can affect human health and are associated with cases of food poisoning. The formation of Bas such as histamine, putrescine, and tyramine were determined, via Process Analytical Chemistry (PAC), in three species of freshwater fish available in markets of city of Pasto in southern Colombia: rainbow trout, tilapia, and cachama. We evaluated the formation of BAs during the fish conservation processes and considered a multifactorial design with two levels. The factors studied were: fish species, slaughter type, storage temperature, and time to purchase. Out of the three fish species studies, tilapia samples revealed the highest average content of putrescine and histamine, with values of 5.4 µg/g and 10.04 µg/g, respectively. Tyramine was not detected in any of the experiments performed. The observed values of BAs in the samples analyzed were below locally tolerated maximal values and the European standard (200 µg/g). However, their presence reveals that factors such as sample storage temperature and time to consumption triggered their formation.","PeriodicalId":39200,"journal":{"name":"Universitas Scientiarum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48256389","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

Chemical synthesis and steady state characterization of a nanocrystalline lithium cobalt oxide 纳米晶锂钴氧化物的化学合成及稳态表征

Universitas Scientiarum Pub Date : 2020-06-16 DOI: 10.11144/javeriana.sc25-2.csas

J. Gómez-Cuaspud, A. Y. Neira-Guio, E. Vera-López, Luís C. Canaría-Camargo

引用次数: 0

Existence of local and global solution for a spatio-temporal predator-prey model 一类时空捕食者-猎物模型的局部解和全局解的存在性

Universitas Scientiarum Pub Date : 2019-12-06 DOI: 10.11144/javeriana.sc24-3.eola

Ricardo Cano-Macias, Jorge Mauricio Ruiz-Vera

引用次数: 0

A raypath-consistent receiver correction in PS converted wave processing through seismic interferometry: New application for tropical zones 地震干涉测量PS转换波处理中的光路一致性接收器校正：热带地区的新应用

Universitas Scientiarum Pub Date : 2019-12-05 DOI: 10.11144/javeriana.sc24-3.arcr

A. Salamanca, Luis Montes-Vides

引用次数: 1