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Victor Perez

María M Banda, Carolina López, Rubiceli Manzo, Gadea Rico-Pérez, Pablo García, Roberto Rosales-Reyes, Miguel A De la Cruz, Fernando C Soncini, Francisco García-Del Portillo, Víctor H Bustamante
When Salmonella is grown in the nutrient-rich lysogeny broth (LB), the AraC-like transcriptional regulator HilD positively controls the expression of genes required for Salmonella invasion of host cells, such as the Salmonella pathogenicity island 1 (SPI-1) genes. However, in minimal media, the two-component system PhoP/Q activates the expression of genes necessary for Salmonella replication inside host cells, such as the SPI-2 genes. Recently, we found that the SL1344_1872 hypothetical gene, located in a S...
March 19, 2018: Scientific Reports
Julian C Berengut, Dmitry Budker, Cédric Delaunay, Victor V Flambaum, Claudia Frugiuele, Elina Fuchs, Christophe Grojean, Roni Harnik, Roee Ozeri, Gilad Perez, Yotam Soreq
We explore a method to probe new long- and intermediate-range interactions using precision atomic isotope shift spectroscopy. We develop a formalism to interpret linear King plots as bounds on new physics with minimal theory inputs. We focus only on bounding the new physics contributions that can be calculated independently of the standard model nuclear effects. We apply our method to existing Ca^{+} data and project its sensitivity to conjectured new bosons with spin-independent couplings to the electron and the neutron using narrow transitions in other atoms and ions, specifically, Sr and Yb...
March 2, 2018: Physical Review Letters
Luis Palma-Garcia, Victor Velásquez-Rimachi, Armando Pezo-Pezo, Joseph Roig, Julio Perez-Villegas
BACKGROUND: Therapeutic plasma exchange (TPE) is an extracorporeal procedure which consists of removing the patient's plasma and replacing it with an appropriate replacement fluid. Plasma and blood cells are separated by a centrifugation process. Our department has used TPE for several years, and in 2013 we introduced an institutional apheresis protocol. The main objective of this report is to describe the TPE procedures performed between 2013 and 2016 in the Peruvian population. METHODS: We analyzed the technical and clinical aspects of 864 centrifugal TPE procedures as well as the associated complications...
March 14, 2018: Journal of Clinical Apheresis
Trinidad Dierssen-Sotos, Camilo Palazuelos-Calderón, José-Juan Jiménez-Moleón, Nuria Aragonés, Jone M Altzibar, Gemma Castaño-Vinyals, Vicente Martín-Sanchez, Inés Gómez-Acebo, Marcela Guevara, Adonina Tardón, Beatriz Pérez-Gómez, Pilar Amiano, Victor Moreno, Antonio J Molina, Jéssica Alonso-Molero, Conchi Moreno-Iribas, Manolis Kogevinas, Marina Pollán, Javier Llorca
BACKGROUND: Reproductive factors are well known risk factors for breast cancer; however, little is known about how genetic variants in hormonal pathways interact with that relationship. METHODS: One thousand one hundred thirty nine cases of breast cancer in women and 1322 frequency-matched controls were compared. Genetic variants in hormonal pathways (identified in the Kyoto Encyclopedia of Genes and Genomes) were screened according to their relationship with breast cancer using the Cochran-Armitage statistic...
March 12, 2018: BMC Cancer
Hitomi Mukaibo, Tonghui Wang, Victor H Perez-Gonzalez, Jirachai Getpreecharsawas, Jack T Wurzer, Blanca Lapizco-Encinas, James L McGrath
Insulator-based dielectrophoresis (iDEP) is a simple, scalable mechanism that can be used for directly manipulating particle trajectories in pore-based filtration and separation processes. However, iDEP manipulation of nanoparticles presents unique challenges as the dielectrophoretic force (<b><i>F</i></b><sub>DEP</sub>) exerted on the nanoparticles can easily be overshadowed by opposing kinetic forces. In this study, a molecularly thin, SiN-based nanoporous membrane (NPN) is explored as a breakthrough technology that enhances <b><i>F</i></b><sub>DEP</sub>...
March 12, 2018: Nanotechnology
Victor H Perez-Gonzalez, Roberto C Gallo-Villanueva, Braulio Cardenas-Benitez, Sergio O Martinez-Chapa, Blanca H Lapizco-Encinas
Insulator based dielectrophoresis (iDEP) is a microfluidic technique used for particle analysis in a wide array of applications. Significant efforts are dedicated to improve iDEP systems by reducing voltage requirements. This study assesses how the performance of an iDEP system, in terms of particle trapping, depends on the number of insulating obstacles longitudinally present in the microchannel. In analogy with Kirchhoff's loop rule, iDEP systems were analyzed as a series combination of electrical resistances, where the equivalent resistance of the post array is composed by a number of individual resistors (columns of insulating posts)...
March 12, 2018: Analytical Chemistry
Javier García-Pérez, Virginia Lope, Beatriz Pérez-Gómez, Antonio José Molina, Adonina Tardón, María Angustias Díaz Santos, Eva Ardanaz, Cristina O'Callaghan-Gordo, Jone M Altzibar, Inés Gómez-Acebo, Víctor Moreno, Rosana Peiró, Rafael Marcos-Gragera, Manolis Kogevinas, Nuria Aragonés, Gonzalo López-Abente, Marina Pollán
Breast cancer is the most frequent tumor in women worldwide, although well-established risk factors account for 53%-55% of cases. Therefore, other risk factors, including environmental exposures, may explain the remaining variation. Our objective was to assess the relationship between risk of breast cancer and residential proximity to industries, according to categories of industrial groups and specific pollutants released, in the context of a population-based multicase-control study of incident cancer carried out in Spain (MCC-Spain)...
March 7, 2018: Environmental Pollution
Víctor Pérez Medina Martínez, Carlos E Espinosa-de la Garza, Diego A Méndez-Silva, Mariana Bolívar-Vichido, Luis F Flores-Ortiz, Néstor O Pérez
Silver nanoparticles (AgNPs) are known to interact with proteins, leading to modifications of the plasmonic absorption that can be used to monitor this interaction, entailing a promising application for sensing adsorption of therapeutic proteins in primary containers. First, transmission electron microscopy in combination with plasmonic absorption and light scattering responses were used to characterize AgNPs and protein-AgNP complexes, including its concentration dependence, using two therapeutic molecules as models: a monoclonal antibody (mAb) and a synthetic copolymer (SC)...
March 8, 2018: AAPS PharmSciTech
Violeta D Alvarez-Jiménez, Kahiry Leyva-Paredes, Mariano García-Martínez, Luis Vázquez-Flores, Víctor Gabriel García-Paredes, Marcia Campillo-Navarro, Israel Romo-Cruz, Víctor Hugo Rosales-García, Jessica Castañeda-Casimiro, Sirenia González-Pozos, José Manuel Hernández, Carlos Wong-Baeza, Blanca Estela García-Pérez, Vianney Ortiz-Navarrete, Sergio Estrada-Parra, Jeanet Serafín-López, Isabel Wong-Baeza, Rommel Chacón-Salinas, Iris Estrada-García
Tuberculosis is an infectious disease caused by Mycobacterium tuberculosis (Mtb). In the lungs, macrophages and neutrophils are the first immune cells that have contact with the infecting mycobacteria. Neutrophils are phagocytic cells that kill microorganisms through several mechanisms, which include the lytic enzymes and antimicrobial peptides that are found in their lysosomes, and the production of reactive oxygen species. Neutrophils also release extracellular vesicles (EVs) (100-1,000 nm in diameter) to the extracellular milieu; these EVs consist of a lipid bilayer surrounding a hydrophilic core and participate in intercellular communication...
2018: Frontiers in Immunology
Miguel Fraile López, Ruth de Francisco, Isabel Pérez-Martínez, Begoña García García, Blanca Vivanco Allende, Víctor Asensi, Sabino Riestra
No abstract text is available yet for this article.
March 5, 2018: Gastroenterología y Hepatología
Mariel Araceli Oyervides-Muñoz, Antonio Alí Pérez-Maya, Hazyadee Frecia Rodríguez-Gutiérrez, Gabriela Sofía Gómez Macias, Oscar Raúl Fajardo-Ramírez, Víctor Treviño, Hugo Alberto Barrera-Saldaña, María Lourdes Garza-Rodríguez
Cervical cancer is one of the main causes of female cancer death worldwide, and human papilloma virus (HPV) its causal agent. To investigate viral oncogenesis several studies have focused on the effects of HPV oncoproteins E6 and E7 and the mechanisms by which these proteins stimulate the cellular transformation process. However, phenomena such as the physical state of the viral genome (episomal or integrated) and the effects of this integration on cell proliferation contribute new clues to understand how HPV infection causes carcinogenesis...
March 5, 2018: Infection, Genetics and Evolution
Allister Gibbons, Ella H Leung, Luis J Haddock, Carlos A Medina, Viviana Fernandez, Jean-Marie A Parel, Heather A Durkee, Guillermo Amescua, Eduardo C Alfonso, Victor L Perez
Purpose: To determine the indications, long-term clinical and visual outcomes, and complications of the aphakic snap-on type I Boston keratoprosthesis (KPro). Design: Retrospective, non-comparative case series. Methods: Forty-five eyes of 43 patients with type I aphakic snap-on KPros with at least 1 year of follow-up were included. The past medical histories, preoperative indications, best-corrected visual acuities (BCVAs), postoperative complications, and retention rates were analyzed...
2018: Clinical Ophthalmology
Marta-Marina Pérez-Alonso, Víctor Carrasco-Loba, Joaquín Medina, Jesús Vicente-Carbajosa, Stephan Pollmann
Over the last three decades, novel "omics" platform technologies for the sequencing of DNA and complementary DNA (cDNA) (RNA-Seq), as well as for the analysis of proteins and metabolites by mass spectrometry, have become more and more available and increasingly found their way into general laboratory life. With this, the ability to generate highly multivariate datasets on the biological systems of choice has increased tremendously. However, the processing and, perhaps even more importantly, the integration of "omics" datasets still remains a bottleneck, although considerable computational and algorithmic advances have been made in recent years...
February 28, 2018: High Throughput
Paula Cabrera-Galeana, Wendy Muñoz-Montaño, Fernando Lara-Medina, Alberto Alvarado-Miranda, Victor Pérez-Sánchez, Cynthia Villarreal-Garza, R Marisol Quintero, Fany Porras-Reyes, Enrique Bargallo-Rocha, Ignacio Del Carmen, Alejandro Mohar, Oscar Arrieta
BACKGROUND: Several breast cancer (BC) trials have adopted pathological complete response (pCR) as a surrogate marker of long-term treatment efficacy. In patients with luminal subtype, pCR seems less important for outcome prediction. BC is a heterogeneous disease, which is evident in residual tumors after neoadjuvant-chemotherapy (NAC). This study evaluates changes in Ki67 in relation to disease-free survival (DFS) and overall survival (OS) in patients without pCR. SUBJECTS, MATERIALS, AND METHODS: Four hundred thirty-five patients with stage IIA-IIIC BC without pCR after standard NAC with anthracycline and paclitaxel were analyzed...
February 28, 2018: Oncologist
Hugo Morales-Briceño, Beatriz E Sanchez-Hernandez, Esther Meyer, Manju A Kurian, Alessandro F Fois, Mayela Rodriguez-Violante, Roberto Leal-Ortega, Christian Perez-Lohman, Shekeeb Mohammad, Victor S C Fung
No abstract text is available yet for this article.
February 28, 2018: Movement Disorders: Official Journal of the Movement Disorder Society
Daniel Castillo, Diliana Pérez-Reytor, Nicolás Plaza, Sebastián Ramírez-Araya, Carlos J Blondel, Gino Corsini, Roberto Bastías, David E Loyola, Víctor Jaña, Leonardo Pavez, Katherine García
Vibrio parahaemolyticus is the leading cause of seafood-borne gastroenteritis worldwide. As reported in other countries, after the rise and fall of the pandemic strain in Chile, other post-pandemic strains have been associated with clinical cases, including strains lacking the major toxins TDH and TRH. Since the presence or absence of tdh and trh genes has been used for diagnostic purposes and as a proxy of the virulence of V. parahaemolyticus isolates, the understanding of virulence in V. parahaemolyticus strains lacking toxins is essential to detect these strains present in water and marine products to avoid possible food-borne infection...
2018: Frontiers in Microbiology
Tayyeba K Ali, Allister Gibbons, Cristián Cartes, Siamak Zarei-Ghanavati, Mohamed Gomaa, Ingrid Gonzalez, Astrid E Gonzalez, Hilal E Ozturk, Carolina Betancurt, Victor L Perez
PURPOSE: To describe the safety and efficacy of autologous serum tears (AST) in managing ocular surface disease resistant to conventional therapy in patients with systemic autoimmune disease(s). DESIGN: Retrospective, interventional case series. METHODS: Records of patients from 2009 to 2015 with systemic autoimmune disease treated with AST (20-50%) for chronic surface disease were analyzed. Standardized measures of subjective dry eye symptoms, objective dry eye staining of the cornea, and slit lamp findings including punctate epithelial erosion (PEE), filamentary keratopathy (FK) and corneal epithelial defects (KED) were compared during first and last visit...
February 19, 2018: American Journal of Ophthalmology
Julio A Diaz-Perez, Mara G Beveridge, Victor A Thomas, Thomas L Cibull
Nivolumab is a fully human IgG4 monoclonal antibody directed against programmed cell death protein 1 (PD-1). PD-1 inhibition allows T-cell activation and recruitment to destroy cancer cells. Checkpoint inhibitors have shown significant survival advantage and relatively low side effects in comparison with conventional chemotherapy in several types of advanced cancer. Granulomatous cutaneous reactions have been reported showing sarcoidal and panniculitic morphology. Here we present a case of drug-induced lichenoid and granulomatous dermatitis after checkpoint inhibitor therapy observed in a 63-year-old male treated with nivolumab for advanced glioblastoma...
February 22, 2018: Journal of Cutaneous Pathology
Bárbara Bermúdez-Reyes, María Del Refugio Lara-Banda, Elizabeth Reyes-Zarate, Augusto Rojas-Martínez, Alberto Camacho, Nidia Moncada-Saucedo, Vanessa Pérez-Silos, Alejandro García-Ruiz, Abel Guzmán-López, Víctor Peña-Martínez, Jorge Lara-Arias, Selem Torres-Méndez, Lizeth Fuentes-Mera
Ceramics and bioceramics, such as hydroxyapatite and zirconium, are used in bone tissue engineering. Hydroxyapatite has chemical properties similar to bone while zirconium offers suitable mechanical properties. The aim of this article is to evaluate the ability to support cell growth and osteoblastic mineralization of hydroxyapatite-zirconium obtained by a new system based on different low temperatures, such as 873 K (HZ600), 923 K (HZ650) and 973 K (HZ700). Hydroxyapatite-zirconia obtained by this new system was examined in terms of thermogravimetric features and x-ray diffractograms...
February 20, 2018: Biomedical Materials
Luz Tarín-Arzaga, Daniela Arredondo-Campos, Victor Martínez-Pacheco, Odra Martínez-González, Alba Ramírez-López, Adrés Gómez-De León, Cesar Homero Gutiérrez-Aguirre, Olga Cantú-Rodríguez, José Carlos Jaime-Pérez, David Gómez-Almaguer
BACKGROUND: The treatment of multiple myeloma (MM) has become costly and difficult to access for patients living in low-income to middle-income countries. METHODS: The current retrospective study included 148 patients in Mexico with newly diagnosed MM, and was performed to compare the outcomes of patients with and without access to novel agents. The records of 77 patients admitted to a public hospital (PubC) and 71 patients cared for within private health systems (PrivC) from November 2007 to July 2016 were reviewed...
February 20, 2018: Cancer
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