Examinando 3.1 Estancias en cooperación internacional por Fecha de asunto

Publicación

Evaluation of the leishmanicidal activity of plants used by Peruvian Chayahuita ethnic group

(Elsevier B.V., 2007)

Estevez Y.

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Castillo D.

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Pisango M.T.

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Arevalo J.

;

Rojas R.

;

Alban J.

;

Deharo E.

;

Bourdy G.

;

Sauvain M.

Aim of the study: A total of 27 ethanolic plant extracts from 27 species were screened for leishmanicidal activity in vitro against Leishmania amazonensis. Most of the selected species (19) are traditionally used by the Chayahuitas, an Amazonian Peruvian ethnic group, to treat skin affections and/or leishmaniasis.

Publicación

Optimization of extraction conditions of antioxidant phenolic compounds from mashua (Tropaeolum tuberosum Ruíz & Pavón) tubers

(Elsevier B.V., 2007)

Chirinos R.

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Rogez H.

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Campos D.

;

Pedreschi R.

;

Larondelle Y.

Optimal conditions for the extraction of phenolic compounds, anthocyanins, flavanols and ORAC antioxidant activity for two mashua genotypes were determined using the conventional liquid–solid method. Phenolic contents and antioxidant activity were affected by the type of solvent, pH level, solvent–water ratio and extraction time.

Publicación

Genome sequence and analysis of the tuber crop potato

(Springer Nature Limited, 2011)

Xu X.

;

Pan S.

;

Cheng S.

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Zhang B.

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Mu D.

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Ni P.

;

Zhang G.

;

Yang S.

;

Li R.

;

Wang J.

;

Orjeda G.

;

Guzman F.

;

Torres M.

;

Lozano R.

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Ponce O.

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Martinez D.

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De La Cruz G.

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Chakrabarti S.K.

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Patil V.U.

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Skryabin G.

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Kuznetsov B.B.

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Ravin N.V.

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Kolganova T.V.

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Beletsky A.V.

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Mardanov A.V.

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Di Genova A.

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Bolser D.M.

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Martin D.M.A.

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Li G.

;

Yang Y.

;

Kuang H.

;

Hu Q.

;

Xiong X.

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Bishop G.J.

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Sagredo B.

;

Mejía N.

;

Zagorski W.

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Gromadka R.

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Gawor J.

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Szczesny P.

;

Huang S.

;

Zhang Z.

;

Liang C.

;

He J.

;

Li Y.

;

He Y.

;

Xu J.

;

Zhang Y.

;

Xie B.

;

Du Y.

;

Qu D.

;

Bonierbale M.

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Ghislain M.

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Herrera M.D.R.

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Giuliano G.

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Pietrella M.

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Perrotta G.

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Facella P.

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O'Brien K.

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Feingold S.E.

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Barreiro L.E.

;

Massa G.A.

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Diambra L.

;

Whitty B.R.

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Vaillancourt B.

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Lin H.

;

Massa A.N.

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Geoffroy M.

;

Lundback S.

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DellaPenna D.

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Buell C.R.

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Sharma S.K.

;

Marshall D.F.

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Waugh R.

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Bryan G.J.

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Destefanis M.

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Nagy I.

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Milbourne D.

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Thomson S.J.

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Fiers M.

;

Jacobs J.M.E.

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Nielsen K.L.

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Sønderkær M.

;

Iovene M.

;

Torres G.A.

;

Jiang J.

;

Veilleux R.E.

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Bachem C.W.B.

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De Boer J.

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Borm T.

;

Kloosterman B.

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Van Eck H.

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Datema E.

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Hekkert B.L.

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Goverse A.

;

Van Ham R.C.H.J.

;

Visser R.G.F.

Potato (Solanum tuberosum L.) is the world’s most important non-grain food crop and is central to global food security. It is clonally propagated, highly heterozygous, autotetraploid, and suffers acute inbreeding depression. Here we use a homozygous doubled-monoploid potato clone to sequence and assemble 86% of the 844-megabase genome. We predict 39,031 protein-coding genes and present evidence for at least two genome duplication events indicative of a palaeopolyploid origin.

Publicación

A numerical algorithm for finding solutions of a generalized Nash equilibrium problem

(Springer Nature, 2012)

Matioli L.C.

;

Sosa W.

;

Yuan J.

A family of nonempty closed convex sets is built by using the data of the Generalized Nash equilibrium problem (GNEP). The sets are selected iteratively such that the intersection of the selected sets contains solutions of the GNEP. The algorithm introduced by Iusem-Sosa (Optimization 52:301–316, 2003) is adapted to obtain solutions of the GNEP. Finally some numerical experiments are given to illustrate the numerical behavior of the algorithm.

Publicación

Morphological Characterization of Mycobacterium tuberculosis in a MODS Culture for an Automatic Diagnostics through Pattern Recognition

(PLOS, 2013)

Alva, A

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Aquino, F

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Gilman, RH

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Olivares, C

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Requena, D

;

Gutierrez, AH

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Caviedes, L

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Coronel, J

;

Larson, S

;

Sheen, P

;

Moore, DAJ

;

Zimic, M

Tuberculosis control efforts are hampered by a mismatch in diagnostic technology: modern optimal diagnostic tests are least available in poor areas where they are needed most. Lack of adequate early diagnostics and MDR detection is a critical problem in control efforts. The Microscopic Observation Drug Susceptibility (MODS) assay uses visual recognition of cording patterns from Mycobacterium tuberculosis (MTB) to diagnose tuberculosis infection and drug susceptibility directly from a sputum sample in 7–10 days with a low cost. An important limitation that laboratories in the developing world face in MODS implementation is the presence of permanent technical staff with expertise in reading MODS.

Publicación

Genotypic Characterization of Enterotoxigenic Escherichia coli Strains Causing Traveler's Diarrhea

(ASM Journals, 2013)

Rivera, FP

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Medina, AM

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Aldasoro, E

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Sangil, A

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Gascon, J

;

Ochoa, TJ

;

Vila, J

;

Ruiz, J

This study aims to characterize the presence of virulence factors of enterotoxigenic Escherichia coli (ETEC) causing traveler's diarrhea. Among 52 ETEC isolates, the most common toxin type was STh, and the most frequent colonization factors (CFs) were CS21, CS6, and CS3. On the other hand, the nonclassical virulence factors EAST1 and EatA were frequently present.

Publicación

Estudio experimental del acabado antimicrobiano textil con nanopartículas: obtención, aplicación y control

(Universidad Nacional de Ingeniería, 2014)

Román Mendoza, Luz Esmeralda

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Román Mendoza, Luz Esmeralda

;

Román Mendoza, Luz Esmeralda

La realización de este tema tesis es producto del trabajo de investigación que se llevó a cabo en la Facultad de Ingeniería Química y Textil, la Facultad de Ciencias de la Universidad Nacional de Ingeniería y en el Laboratorio de Investigación y Desarrollo de la Universidad Peruana Cayetano Heredia, bajo la supervisión de: Ing. Carmen Uribe V., Ing. Elsa Roca M., Ing. Marco Brañez S., Dra. Mónica Gómez L., Dr. José Solís V., y la M.Sc. Dora Maurtua. El tema de tesis es la investigación y desarrollo de un producto de acabado textil con propiedades antimicrobianas a base de nanopartículas de ZnO2, para ello se ha hecho diversos análisis como: síntesis, caracterización estructural y morfológica, solideces, pruebas físicas y enfrentamientos microbiológicos.

Publicación

Case Report: Possible Vertical Transmission of Bartonella bacilliformis in Peru

(American Society of Tropical Medicine and Hygiene, 2015)

Tuya, XL

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Escalante-Kanashiro, R

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Tinco, C

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Pons, MJ

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Petrozzi, V

;

Ruiz, J

;

del Valle, J

A 22-day-old male was admitted with a 2-day history of irritability, dyspnea, jaundice, fever, and gastroin testinal bleeding. A thin blood smear was performed, which showed the presence of intraerythrocyte bacteria identified as Bartonella bacilliformis, and subsequently, the child was diagnosed with Carrion’s disease. The diagnosis was confirmed by specific polymerase chain reaction. The child was born in a non-endemic B. bacilliformis area and had not traveled to such an area before hospitalization. However, the mother was from an endemic B. bacilliformis area, and posterior physical examination showed the presence of a wart compatible with B. bacilliformis in semi-immune subjects.These data support vertical transmission of B. bacilliformis.

Publicación

Characterization of two Achromobacter xylosoxidans isolates from patients with pertussis-like symptoms

(Elsevier B.V., 2015)

Orellana-Peralta, F

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Jacinto, M

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Pons, MJ

;

Gomes, C

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Bada, C

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Reyes, I

;

Mendoza, JD

;

Ruiz, J

To characterize two Achromobacter xylosoxidans recovered from 2 patients diagnosed with pertussis during a Bordetella pertussis surveillance program.

Publicación

Efecto de la adición de fluido folicular al medio de maduración de ovocitos para la producción In vitro de embriones de bovino (Bos taurus)

(Universidad Nacional Jorge Basadre Grohmann, 2015)

Limache Coaquera, Tito

El presente trabajo de investigación se realizó en la ciudad de Lima, con el objetivo de evaluar el efecto de la adición del fluido folicular (FF) al medio de maduración de ovocitos sobre la producción in vitro de embriones bovinos.

Publicación

Vacancy ordered gamma-Fe2O3 nanoparticles functionalized with nanohydroxyapatite: XRD, FTIR, TEM, XPS and Mossbauer studies

(Elsevier B.V., 2016)

Guivar, JAR

;

Sanches, EA

;

Bruns, F

;

Sadrollahi, E

;

Morales, MA

;

Lopez, EO

;

Litterst, FJ

Vacancy ordered maghemite (γ-Fe2O3) nanoparticles functionalized with nanohydroxyapatite (HAp – Ca10(PO4) 6(OH)2) have been successfully synthesized using an inexpensive co-precipitation chemical route. Evidence for the presence of vacancy order in maghemite was shown by the superstructure lines observed in X-ray diffraction. The adsorption of carboxyl groups of citric acid (C6H8O7) onto γ-Fe2O3 nanoparticles was investigated by FTIR, XPS and Mössbauer spectroscopy.

Publicación

Vacancy ordered γ-Fe 2 O 3 nanoparticles functionalized with nanohydroxyapatite: XRD, FTIR, TEM, XPS and Mössbauer studies

(Elsevier, 2016)

Ramos Guivar J.A.

;

Sanches E.A.

;

Bruns F.

;

Sadrollahi E.

;

Morales M.A.

;

López E.O.

;

Litterst F.J.

Vacancy ordered maghemite (γ-Fe2O3) nanoparticles functionalized with nanohydroxyapatite (HAp – Ca10(PO4) 6(OH)2) have been successfully synthesized using an inexpensive co-precipitation chemical route. Evidence for the presence of vacancy order in maghemite was shown by the superstructure lines observed in X-ray diffraction. The adsorption of carboxyl groups of citric acid (C6H8O7) onto γ-Fe2O3 nanoparticles was investigated by FTIR, XPS and Mössbauer spectroscopy. From XPS surface analysis, two binding energies related to oxygen were attributed to bindings between C6H8O7/γ- Fe2O3 and C6H8O7/HAp from an interfacial reaction promoted by strongly adsorbed H2O molecules at the surface of these nanomaterials.

Publicación

Función de transferencia de movimiento del suelo entre dos estaciones sísmicas cercanas: efecto de sitio

(Universidad Nacional Mayor de San Marcos, 2016)

Flores Cuba, Joseph Michael

Las condiciones de sitio, las características geológicas y geométricas de los depósitos de suelo y la topografía superficial, influencian fuertemente en la amplitud, contenido de frecuencias y duración de las ondas sísmicas incidentes en un sitio. Esta influencia ha sido observada mediante la comparación de registros sísmicos obtenidos de sitios con diferentes condiciones geológicas locales. Este fenómeno es conocido como efecto de sitio. Revisa los estudios más relevantes acerca del efecto de sitio con el objetivo de analizar y comprender la influencia de las condiciones locales en la transferencia de movimiento de las ondas incidentes en un sitio.

Publicación

The Urbach focus and optical properties of amorphous hydrogenated SiC thin films

(IOP Publishing, 2016)

Guerra, JA

;

Angulo, JR

;

Gomez, S

;

Llamoza, J

;

Montanez, LM

;

Tejada, A

;

Tofflinger, JA

;

Winnacker, A

;

Weingartner, R

We report on the optical bandgap engineering of sputtered hydrogenated amorphous silicon carbide (a-SiC:H) thin films under different hydrogen dilution conditions during the deposition process and after post-deposition annealing treatments. The Tauc-gap and Urbach energy are calculated from ultraviolet-visible optical transmittance measurements. Additionally, the effect of the thermal annealing temperature on the hydrogen out-diffusion is assessed through infra-red absorption spectroscopy. A new model for the optical absorption of amorphous semiconductors is presented and employed to determine the bandgap as well as the Urbach energy from a single fit of the absorption coefficient. This model allowed the discrimination of the Urbach tail from the Tauc region without any external bias. Finally, the effect of the hydrogen dilution on the band-edge and the Urbach focus is discussed.

Publicación

Four new species of Aleiodes (Hymenoptera: Braconidae: Rogadinae) from the Neotropical Region

(Cambridge University Press (CUP), 2017)

Garro, Lidia Sulca

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Shimbori, Eduardo Mitio

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Penteado-Dias, Angelica Maria

;

Shaw, Scott Richard

Four new species of the Aleiodes apicalis (Brulle) species group (Hymenoptera: Braconidae: Rogadinae) from the Neotropical Region are described and illustrated: Aleiodes ambrosiae new species. from Peru, A. aquilesi new species from Costa Rica, and A. sachambrosiae new species and A. tapirape new species from Brazil. We also add new distribution records for Aleiodes molestus Cresson, from Costa Rica. With the addition of the new species, the A. apicalis species group has 11 species from the New World, six of which are recorded from Neotropical Region.

Publicación

Simple light-emitting electrochemical cell using reduced graphene oxide and a ruthenium (II) complex

(Optica Publishing Group, 2017)

Tito, HAR

;

Zimmermann, J

;

Jurgensen, N

;

Sosa, GH

;

Caceda, MEQ

We report the use of conducting substrates from reduced graphene oxide (rGO) applied in light-emitting electrochemical cells (LECs) in which we used an electroluminescent polymer as a light-emitting layer. The emitting layer was composed of an organic metal complex of tris(2, 2′-bipyridine) ruthenium (II) linked to the sodium tetrafluoroborate anion ([Ru(bpy)3]+2)(BF4)−1. The luminance generated from the electroluminescent device was 6.89 Cd/m2 when applying a voltage of 13.48 V and a current of 10.19 mA. The luminance of this device was kept on almost constant for 36.84 min. The prolonged lifetime of the electrochemical device was achieved by depositing an rGO thin layer with a 161.3 nm thickness inside the LEC structure.

Publicación

Geodésicas del Fibrado Tangente

(Universidad Nacional de San Agustín de Arequipa, 2017)

Frizancho Chura, Sandra Elizabeth

En el presente trabajo estudiaremos el ﬁbrado tangente TM de una variedad riemanniana (Mn,g)con la métrica de Sasaki G, que está en función de la métrica g de la variedad riemanniana Mn, también estudiaremos las geodésicas en el ﬁbrado tangente TM donde veremos la relación entre las geodésicas de Mn y TM. Para estudiar las geodésicas del ﬁbrado tangente se estudiará la inversa de la matriz de la métrica de Sasaki GJK respecto a una parametrización donde 1≤ J,K ≤2n, con la ﬁnalidad de determinar localmente los símbolos de Christoﬀel del ﬁbrado tangente y así poder deﬁnir explícitamente su conexión.

Publicación

Production and characterization of a highly pure RNA polymerase holoenzyme from Mycobacterium tuberculosis

(Elsevier B.V., 2017)

Herrera-Asmat O.

;

Lubkowska L.

;

Kashlev M.

;

Bustamante C.J.

;

Guerra D.G.

;

Kireeva M.L.

Recent publications have shown that active RNA polymerase (RNAP) from Mycobacterium tuberculosis (MtbRNAP) can be produced by expressing all four subunits in a single recombinant Escherichia coli strain [1–3]. By reducing the number of plasmids and changing the codon usage of the Mtb genes in the co-expression system published by Banerjee et al. [1], we present a simplified, detailed and reproducible protocol for the purification of recombinant MtbRNAP containing the ω subunit. Moreover, we describe the formation of ternary elongation complexes (TECs) with a short fluorescence-labeled RNA primer and DNA oligonucleotides, suitable for transcription elongation studies.

Publicación

Determination of the complex refractive index and optical bandgap of CH3NH3PbI3 thin films

(AIP Publishing, 2017)

Guerra, J. A.

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Tejada, A.

;

Korte, L.

;

Kegelmann, L.

;

Tofflinger, J. A.

;

Albrecht, S.

;

Rech, B.

;

Weingartner, R.

We report the complex refractive index of methylammonium lead iodide (CH3NH3PbI3) perovskite thin films obtained by means of variable angle spectroscopic ellipsometry and transmittance/reflectance spectrophotometry in the wavelength range of 190 nm to 2500 nm. The film thickness and roughness layer thickness are determined by minimizing a global unbiased estimator in the region where the spectrophotometry and ellipsometry spectra overlap. We then determine the optical bandgap and Urbach energy from the absorption coefficient, by means of a fundamental absorption model based on band fluctuations in direct semiconductors. This model merges both the Urbach tail and the absorption edge regions in a single equation. In this way, we increase the fitting region and extend the conventional (αℏω)2-plot method to obtain accurate bandgap values. © 2017 Author(s).

Publicación

Optical characterization and bandgap engineering of flat and wrinkle-textured FA(0.83)Cs(0.17)Pb(l(1-x)Brx)(3) perovskite thin films

(AIP Publishing LLC., 2018)

Tejada, A

;

Braunger, S

;

Korte, L

;

Albrecht, S

;

Rech, B

;

Guerra, JA

The complex refractive indices of formamidinium cesium lead mixed-halide [FA0.83Cs0.17Pb(I1– xBrx)3] perovskite thin films of compositions ranging from x = 0 to 0.4, with both flat and wrinkle-textured surface topographies, are reported. The films are characterized using a combination of variable angle spectroscopic ellipsometry and spectral transmittance in the wavelength range of 190 nm to 850 nm. Optical constants, film thicknesses and roughness layers are obtained point-by-point by minimizing a global error function, without using optical dispersion models, and including topographical information supplied by a laser confocal microscope.

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