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色谱 2012年第11期30卷 1194-1202页

作者： André Moreni LOPES Jorge Sánchez ROMEU Rolando Páez MEIRELES Gabriel Marquez PERERA Rolando Perdomo MORALES Adalberto PESSOA lourdes zumalacárregui cárdenas Department of Biochemical and Pharmaceutical Technology School of Pharmaceutical SciencesUniversity of So Paulo(FCF/USP) Purification Development Department Center for Genetic Engineering and Biotechnology(CIGB) center for Pharmaceuticals Research and Development(cIDEM) Higher Polytechnic Institute José Antonio Echeverría(cUJAE)

Endotoxins(also known as lipopolysaccharides(LPS)) are undesirable by-products of recombinant proteins,purified from Escherichia *** can be considered stable under a wide range of temperature and pH,making their removal one of the most difficult tasks in downstream processes during protein *** inherent toxicity of LPS makes their removal an important step for the application of these proteins in several biological assays and for a safe parenteral *** metal affinity chromatography(IMAc) enables the affinity interactions between the metal ions(immobilized on the support through the chelating compound) and the target molecules,thus enabling high-efficiency separation of the target molecules from other components present in a *** chromatography is applied with ca2+-iminodiacetic acid(IDA) to remove most of the LPS contaminants from the end product(more than90%).In this study,the adsorption of LPS on an IDA-ca2+ was *** adsorption Freundlich isotherm of LPS-IDA-ca2+ provides a theoretical basis for LPS *** was found that LPS is bound mainly by interactions between the phosphate group in LPS and ca2+ ligands on the *** factors such as pH(4.0 or 5.5) and ionic strength(1.0 mol/L) are essential to obtain effective removal of LPS for contaminant levels between endotoxin' concentration values less than100 EU/mL and 100 000 EU/*** new protocol represents a substantial advantage in time,effort,and production costs.

关键词： immobilized metal affinity chromatography(IMAc) lipopolysaccharides(LPS) endotoxin removal recombinant proteins isotherms protein purification

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质粒DNA在灌柱色谱基质上的吸附行为(英文)

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色谱 2012年第5期30卷 522-526页

作者： Miladys LIMONTA lourdes zumalacrregui Dayana SOLER center for Genetic Engineering and Biotechnology Higher Polytechnic Institute José Antonio Echeverría cuba

Anion exchange chromatography is the most popular chromatographic method for plasmid *** R1 50 is a perfusio n chro mato graphic suppo rt w hich is a reversed phase matrix and is an alternative to co nventio nal o nes due to its mass transfer pro *** adso rptio n and elutio n o f the pIDKE2 plasmid o nto reversed phase POROS R1 50 w as *** iso therm mo del w as adjusted in o rder to get the max imum adso rptio n capacity and the disso ciatio n co nstant fo r POROS R1 50-plasmid DNA(pDNA) *** ugh curves w ere o btained fo r vo lumetric flo w s betw een 0.69-3.33 mL/min,given dynamic capacity up to 2.3 times higher than tho se repo rted fo r io nic ex change matrix used during the purificatio n pro cess o f plasmids w ith similar size to that o f *** efficiency w as less than 45% fo r the flo w co nditio ns and initial co ncentratio n studied,w hich means that the suppo rt w ill no t be o perated under saturatio n circumstances.

关键词：色谱 POROS WFI 理论

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3种阴离子交换色谱固定相捕获细胞培养上清液中红细胞生成素的效果比较（英文）

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色谱 2015年第6期33卷 642-646页

作者： lourdes HERNNDEZ Diobel STEWART lourdes zumalacrregui Daniel AMARO Development Product Department Manufacturing Plant of Recombinant Proteins and VaccinesCenter for Molecular Immunology Department of chemical Engineering Faculty of Chemical EngineeringHigher Polytechnic Institute José Antonio Echeverría

Affinity and ion exchange conventional chromatography have been used to capture erythropoietin(EPO)from mammalian cell culture ***,chromatographic adsorbent perfusion is available,however a limited number of applications have been found in the *** this work,three anion exchange chromatographic supports(gel,membrane and monolithic)were evaluated in the capture step of the recombinant erythropoietin purification *** influences of load and flow rate on each support performance were *** the purity of the EPO molecules was determined.A productivity analysis,as a decision tool for larger scale implementation,was *** a conclusion,the evaluated supports are technically suitable to capture EPO with adequate recovery and good ***,the monolithic column admits high operating velocity,showing the highest adsorption capacity and productivity.

关键词： anion exchange chromatography supports recombinant erythropoietin purification

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comparison of cIM~ c4-HLD monolithic column with Sartobind phenyl membrane column for pIDKE2 purification

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色谱 2017年第10期35卷 1028-1036页

作者： Miladys LIMONTA lourdes zumalacrregui Urska VIDIc Nika LENDERO KRAJNc center for Genetic Engineering and Biotechnology Technical University of Havana"José Antonio Echeverría" BIA Separations

The main component of the center for Genetic Engineering and Biotechnology(cIGB)candidate vaccine against Hepatitis c virus(HcV)is the pIDKE2 *** current designed downstream process for the production of pIDKE2 fulfils all regulatory requirements and renders the required quantities of pharmaceuticalgrade plasmid DNA(pDNA)with 95%*** advantages of this procedure include high plasmid purity and the elimination of undesirable additives,such as toxic organic extractants and animal-derived ***,yields and consequently the productivity of the process are *** work demonstrated that the most critical step of the process is the reverse phase chromatography,where conventional porous particle resins are ***,to increase the process productivity,alternative technologies such as membranes and chromatographic monoliths were tested as alternative options for this critical ***,a comparison between the behaviors of cIM~ c4-HLD and Sartobind phenyl matrices was *** obtain higher productivities and purities,the dynamic binding capacities and selectivities were *** results showed that both matrices had a similar capacity for pIDKE2 plasmid,but the separation of pDNA isoforms using cIM~ technology was much better than that with ***,the optimal conditions for loading plasmid DNA on a cIMc4-HLD 800-mL monolithic column in a real production process were *** optimizations will allow production levels to satisfy the high plasmid consumption demanded by clinical trials.

关键词： membrane monolith downstream processing plasmid DNA (pDNA) breakthrough supercoiled (Sc) plasmid open circular (Oc) plasmid

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Adsorption of Mn^(2+) from aqueous solution using Fe and Mn oxide-coated sand

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Journal of Environmental Sciences 2013年第7期25卷 1483-1491页

作者： chi-chuan Kan Mannie c Aganon cybelle Morales Futalan Maria lourdes P Dalida Institute of Hot Spring Industry Chia Nan University of Pharmacy and Science Environmental Engineering Unit University of Philippines Diliman Department of chemical Engineering University of Philippines Diliman

The adsorption of Mn2＋ onto immobilized Mn-oxide and Fe-oxide adsorbent such as manganese oxide-coated sand 1 （MOcS1）, manganese oxide-coated sand2 （MOcS2）, iron oxide-coated sand2 （IOcS2）, and manganese and iron oxide-coated sand （MIOcS）was investigated. The effects of pH （5.5 to 8.0） and temperature （25 to45°c） on the equilibrium capacitywere examined. Equilibrium studies showed that there is a good fitwith both Freundlich and Langmuir isotherm,which indicates surface heterogeneity and monolayer adsorption of the adsorbents. Kineticdata showed high correlationwith the pseudo second-order model,which signifies a chemisorption-controlled mechanism. The activation energies, activation parameters （ΔG＊,ΔH＊,ΔS＊）, and thermodynamic parameters （ΔG0 , ΔH0 , ΔS0 ） confirmed that adsorptionwith MIOcSwas endothermic and more spontaneous at higher temperaturewhile an opposite trendwas observed for the other adsorbents. Thermodynamic studies showed that adsorption involved formation of activated complex,where MOcS1 and MIOcS follow a physical-chemical mechanism,while MOcS2 and IOcS2 follows purely chemical mechanism.

关键词： activation energy iron oxide kinetics manganese oxide thermodynamics

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Frailty and acute coronary syndrome: does gender matter?

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Journal of Geriatric cardiology 2019年第2期16卷 138-144页

作者： lourdes Vicent Manuel Martinez-Selles Servicio de cardiologia Hospital General Universitario Gregorio MaraiionCIBERCVMadridSpain Universidad Europea Universidad ComplutenseMadridSpain

There are important sex-related differences in elderly patients with acute coronary syndrome(AcS).Women are older,more frequently frail,and present more comorbidities than *** symptoms at presentation are also more common in female patients,they are leaded to a delayed diagnosis and *** angiography and subsequent revascularization are frequently underused in elderly women and they tend to receive less guidelines-recommended *** prognosis in elderly frail women with AcS is poor,and it is with high mortality and readmissions *** is recurrent ischemic events in which it is more frequent in women than in *** time might be long,and a multidisciplinary approach is desirable to improve prognosis and quality of *** studies are needed in order to clarify the benefit of the different therapies in the group of frail women,and this is particularly true for revascularization,as scientific evidence in this group is very scarce.

关键词： Acute coronary syndrome Frailty The elderly Women

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Second generation biorefining in Ecuador:circular bioeconomy,zero waste technology,environment and sustainable development:The nexus

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Journal of Bioresources and Bioproducts 2021年第2期6卷 83-107页

作者： lourdes M.Orejuela-Escobar Andrea c.Landázuri Barry Goodell Universidad San Francisco de Quito USFQ Colegio de Ciencias e IngenieríasInstituto de Ingeniería CircularEngineeringApplied Sciences&Simulation Group(GICAS)Chemical Engineering DepartmentDiego de Robles y Vía InteroceánicaP.O.Box 17-0901QuitoEcuador Universidad San Francisco de Quito USFQ Instituto de Investigaciones Biológicas y Ambientales BIÓSFERADiego de Robles y Vía InteroceánicaP.O.Box 17-0901QuitoEcuador University of Massachusetts Department of MicrobiologyAmherstMA 01003United States

The projection of world population growth with concurrent generation of large volumes of agroindustrial waste that negatively affect the environment is of great ***,this review article describes the nexus between concepts of circular Bioeconomy,Zero Waste Technology,Sustainable Development,Biorefineries,and alternatives and research efforts to generate less environmental impact.A brief analysis of the Ecuadorian industry and exports is described,emphasizing the fact that,to improve the Ecuadorian trade balance,it is necessary to increase industrial *** is important to have emerging technologies and innovation in order to promote the replacement of fossil-derived raw materials with renewable raw materials and develop more environmentally friendly processes and *** paper analyses the state of biomass research and its transformation in Ecuador,together with current pretreatment research on biomass to obtain bioproducts and biofuels in a biorefinery that promotes clean production for the extraction of phytochemicals using green solvents,such as deep eutectic solvents;and technologies to recover high-value added materials with enhanced *** conclusion,the need to develop technologies and markets to commercialize high value-added products coming from biorefineries is highlighted,as this will increase the income both in rural and urban areas and will strengthen the productivity and profitability of the Ecuadorian *** goal through this analysis is to improve Ecuador’s trade balance while also contributing to the circular bioeconomy that promotes sustainable development.

关键词： Biorefinery circular bioeconomy Agro-industrial by-products High-added-value products Sustainable development

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Species and Plant community Reorganization in the Trans-Mexican Volcanic Belt under climate change conditions

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Journal of Mountain Science 2013年第6期10卷 923-931页

作者： VILLERS-RUIZ lourdes cASTAEDA-AGUADO Diana center of Atmospheric Sciences National Autonomous University of Mexico (UNAM) School of Science Biology Department National Autonomous University of Mexico (UNAM)

This study analyzes six vegetation communities in relation to current climatic parameters and eight climate change scenarios along an elevation gradient extending from 2,710 m to 4,210 m in the Trans-Mexican Volcanic Belt. The projected movements of 25 plant species with the current restricted or wide altitudinal distributions were also modeled. To relate climatic parameters to the species and communities, a Precipitation/Temperature （P/T） index was used both for the current and the different climate-change scenarios. The temperatures are expected to increase by 1.1℃ to 1.7℃ by 2020 and by 2℃ to 3℃ by 2o5o. A decrease of 4% to 13% in the annual precipitation is expected for the 2020 horizon, and a reduction between 3% and 20% is expected for 2050. The reductions in water availability were projected for all altitude levels and plant communities. The most marked reduction was under the HADLEY- A2 scenario, in which the lower limit of the altitudinal range increased from 2,71o to 3,31o m （2050 horizon） with reductions in the P/T index between 36% and 39% compared to the current climate. Most plant species tended to shift their distribution from 20o to 300 m upward in the 2020 temporal horizon scenarios. The Pinus hartwegii, Alnus jorullensis and Pinus montezumae communities would have a shorter altitudinal range as they move upward and merge with the remaining species at the higher altitudinal range. For the 2o5o temporal horizon, 3o% of the species, primarily those from the higher altitudinal range, would disappear because their P/Tindex values would be above the limit of plant survival （〉4,210 m）.

关键词： Forest communities climate change Upward movement Natural protected areas

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Seed Dispersal of citharexylum tetramerum and Ziziphus penduculata by carnivorous in a Xerophilous Scrub at Tehuacan, Puebla, Mexico

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American Journal of Plant Sciences 2023年第9期14卷 977-987页

作者： González-Pérez Adrián Miguel A. Armella Maria de lourdes Yáñez-López María de lourdes Martinez-cárdenas José Alejandro Zavala-Hurtado Department of Biology Universidad Autonoma Metropolitana Unidad Iztapalapa Iztapalapa Ciudad de Mexico Mexico Department of Biotechnology Universidad Autonoma Metropolitana Unidad Iztapalapa Iztapalapa Ciudad de Mexico Mexico Department of Health Sciences Universidad Autonoma Metropolitana Unidad Iztapalapa Iztapalapa Ciudad de Mexico Mexico

Seed dispersion reduces the depredation rate and increases genetic flow. Some species of carnivora consume fruits as a standard component of their diet, so they become potential seed dispersers. In Mexico, a few studies evaluated carnivorous as seed dispersers, especially in dry ecosystems. citharexylum tetramerum and Ziziphus pedunculata are endemic plants from the Tehuacán-cuicatlán’s Biosphere Reserve (TcBR);however, there are very little data about dispersal seeds for both species. We assessed the germination of seeds ingested by carnivores obtained from feces. We compared them with seeds from fruits as a control group. At the Metropolitan University laboratory, we germinated seeds, from: plants, scats, and fruits, and we used Kruskall Wallis Test to compare percentage and germination rate. c. tetramerum seeds ingested by a carnivorous decreased in germination percentage and rate. In contrast, the percentage and rate of germination of Z. pedunculata seeds from carnivorous feces were higher than the control group. However, Z. pedunculata control seeds did not germinate during tests, but at the end of the tests, we found that 90% of control seeds were not dead, so they were dormant seeds. carnivores interact as legitime dispersers for both plants because they are keeping the viability of seeds. Still, we only showed that Z. pedunculata gut carnivores broke with the dormancy of seeds. We consider that in future research, it could be essential to identify other animals that consume fruits of those plants and if it is possible to follow seeds after they have been removed. Those points could help to get better understanding of those endemic plants from Tehuacán.

关键词： Seed Dispersal

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Fractional Square Functions and Potential Spaces, Ⅱ

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Acta Mathematica Sinica,English Series 2015年第11期31卷 1759-1774页

作者： Jorge J.BETANcOR Juan c.FARIA lourdes RODRIGUEZ-MESA Ricardo TESTONI Jos L.TORREA Departamento de Anlisis Matemtico Universidad de La Laguna Campus de Anchieta Avda.Astrofísico Francisco Snchez 38271 La Laguna (Sta.Cruz de Tenerife) Spain Departamento de Matemtica Universidad Nacional del Sur Avda. Alem 1253 8000 Bahía BlancaBuenos Aires Argentina Departamento de Matem'aticas Universidad Autónoma de Madrid ICMAT-CSIC-UAM-UCM-UC3MCiudad Universitaria de Canto Blanco 28049 Madrid Spain

In this paper, we study fractional square functions associated with the Poisson semigroup for SchrSdinger operators. We characterize the potential spaces in the SchrSdinger setting by using vertical, area and gλ, fra... 详细信息

关键词： g-function Schrodinger operator potential space

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