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https://www.readbyqxmd.com/read/29441398/a-protic-ionic-liquid-as-an-atom-economical-solution-for-palladium-catalyzed-asymmetric-allylic-alkylation
#1
Itzel Guerrero-Ríos, Alfonso H Ortiz-Ramírez, Piet W N M van Leeuwen, Erika Martin
The asymmetric allylic alkylation of rac-1,3-diphenyl-3-acetoxyprop-1-ene (I) catalysed by palladium and diverse phosphorus containing ligands [(S)-BINAP, (R,R)-Chiraphite and (R,R)-Et-Duphos] in an ionic liquid [HDBU][OAc] was successfully performed, achieving full conversions and up to 96% ee of the (S)-product when (R,R)-Et-Duphos was used as a ligand. The reaction could be performed using an equimolar amount of substrate, malonate and base DBU, in which case the total products sum to the desired alkylated product and the ionic pair [HDBU][OAc]; this system thus produces its own IL solvent as the only co-product...
February 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29439486/biosorption-of-cadmium-by-non-toxic-extracellular-polymeric-substances-eps-synthesized-by-bacteria-from-marine-intertidal-biofilms
#2
Juan Carlos Camacho-Chab, María Del Refugio Castañeda-Chávez, Manuel Jesús Chan-Bacab, Ruth Noemí Aguila-Ramírez, Itzel Galaviz-Villa, Pascual Bartolo-Pérez, Fabiola Lango-Reynoso, Carolina Tabasco-Novelo, Christine Gaylarde, Benjamín Otto Ortega-Morales
Cadmium is a major heavy metal found in polluted aquatic environments, mainly derived from industrial production processes. We evaluated the biosorption of solubilized Cd 2+ using the extracellular polymeric substances (EPS) produced by Bacillus sp. MC3B-22 and Microbacterium sp. MC3B-10 (Microbactan); these bacteria were originally isolated from intertidal biofilms off the coast of Campeche, Mexico. EPS were incubated with different concentrations of cadmium in ultrapure water. Residual Cd 2+ concentrations were determined by Inductive Coupled Plasma-Optic Emission Spectrometry and the maximum sorption capacity (Qmax) was calculated according to the Langmuir model...
February 11, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29380908/type-specific-persistence-and-clearance-rates-of-hpv-genotypes-in-the-oral-and-oropharyngeal-mucosa-in-an-hiv-aids-cohort
#3
Itzel Castillejos-García, Velia Ramírez-Amador, Adela Carrillo-García, Alejandro García-Carrancá, Marcela Lizano, Gabriela Anaya-Saavedra
BACKGROUND: Oral high-risk human papillomavirus (HR-HPV) infections are frequent and persistent among HIV-positive population and are associated with an increased risk for head and neck cancer (HNC). In this study, we sought to determine the incidence, persistence, and clearance of HPV-infections in oral and oropharyngeal samples from HIV/AIDS subjects. METHODS: A longitudinal, observational, and analytical study was performed with an ongoing cohort of HIV/AIDS subjects in Mexico City (September 2013-February 2015)...
January 30, 2018: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/29378958/trpv1-channels-and-the-progesterone-receptor-sig-1r-interact-to-regulate-pain
#4
Miguel Ortíz-Rentería, Rebeca Juárez-Contreras, Ricardo González-Ramírez, León D Islas, Félix Sierra-Ramírez, Itzel Llorente, Sidney A Simon, Marcia Hiriart, Tamara Rosenbaum, Sara L Morales-Lázaro
The Transient Receptor Potential Vanilloid 1 (TRPV1) ion channel is expressed in nociceptors where, when activated by chemical or thermal stimuli, it functions as an important transducer of painful and itch-related stimuli. Although the interaction of TRPV1 with proteins that regulate its function has been previously explored, their modulation by chaperones has not been elucidated, as is the case for other mammalian TRP channels. Here we show that TRPV1 physically interacts with the Sigma 1 Receptor (Sig-1R), a chaperone that binds progesterone, an antagonist of Sig-1R and an important neurosteroid associated to the modulation of pain...
January 29, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29344269/early-and-partial-reduction-in-cd4-foxp3-regulatory-t-cells-during-colitis-associated-colon-cancer-induces-cd4-and-cd8-t-cell-activation-inhibiting-tumorigenesis
#5
Jonadab E Olguín, Itzel Medina-Andrade, Emmanuel Molina, Armando Vázquez, Thalia Pacheco-Fernández, Rafael Saavedra, Carlos Pérez-Plasencia, Yolanda I Chirino, Felipe Vaca-Paniagua, Luis E Arias-Romero, Emma B Gutierrez-Cirlos, Sonia A León-Cabrera, Miriam Rodriguez-Sosa, Luis I Terrazas
Colorectal cancer (CRC) is the second most commonly diagnosed cancer in women and the third in men in North America and Europe. CRC is associated with inflammatory responses in which intestinal pathology is caused by different cell populations including a T cell dysregulation that concludes in an imbalance between activated T (Tact) and regulatory T (Treg) cells. Treg cells are CD4+Foxp3+ cells that actively suppress pathological and physiological immune responses, contributing to the maintenance of immune homeostasis...
2018: Journal of Cancer
https://www.readbyqxmd.com/read/29331845/effect-of-levetiracetam-on-extracellular-amino-acid-levels-in-the-dorsal-hippocampus-of-rats-with-temporal-lobe-epilepsy
#6
Pichardo Macías Luz Adriana, Ramírez Mendiola Blanca Alcira, Contreras García Itzel Jatziri, Zamudio Hernández Sergio Roberto, Chávez Pacheco Juan Luis, Sánchez Huerta Karla Berenice, Mendoza Torreblanca Julieta Griselda
Levetiracetam (LEV) is an anticonvulsant drug with a unique mechanism of action that is not completely understood. However, its activity profile may involve effects on excitatory and/or inhibitory neurotransmission since the primary target of LEV, synaptic vesicle protein 2A, is ubiquitously expressed in all types of synaptic vesicles. Therefore, the objective of the present study was to explore the effect of LEV (300 mg/kg/day for one week, administered via osmotic mini-pumps) on neurotransmitter release and its probable selective effect on extracellular gamma-amino butyric acid (GABA), glutamate (Glu), aspartate (Asp), glutamine (Gln), taurine (Tau) and glycine (Gly) concentrations (using in vivo microdialysis under basal and high-K+ conditions) in the dorsal hippocampus (DH), a region that undergoes major synaptic changes during epilepsy...
January 5, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29301439/use-of-lactate-protm2-for-measurement-of-fetal-scalp-blood-lactate-during-labor-proposing-new-cutoffs-for-normality-preacidemia-and-acidemia-a-cross-sectional-study
#7
L Iorizzo, T W Klausen, E Wiberg-Itzel, F Ovin, N Wiberg
OBJECTIVE: Measurement of fetal scalp blood lactate is a supplementary tool to cardiotocography in the case of a non-reassuring tracing. Several hand-held lactate meters have been launched, all with differentials in absolute values. Therefore, the reference intervals must be calculated for each device. The internationally accepted reference interval is based on measurement with Lactate ProTM with recently got out of production. The aim of this study was to propose cutoffs for normality, preacidemia, and acidemia in fetal scalp blood for Lactate ProTM2 based on the comparison of lactate values measured with Lactate ProTM and Lactate ProTM2...
January 4, 2018: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29283272/-oh-i-m-not-alone-experiences-of-hiv-positive-men-who-have-sex-with-men-in-a-health-navigation-program-to-promote-timely-linkage-to-care-in-guatemala-city
#8
Dirk A Davis, Jose Manuel Aguilar, Cesar Galindo Arandi, Sanny Northbrook, M Itzel Loya-Montiel, Sonia Morales-Miranda, Clare Barrington
Men who have sex with men (MSM) are disproportionately affected by HIV in Guatemala and may benefit from health navigation programs designed to support timely linkage to HIV care. We conducted qualitative in-depth interviews with MSM (n = 19) linked to care within days of their diagnosis with the support of a health navigator. We used narrative analysis and systematic coding to identify themes related to HIV diagnosis and experiences with navigators. Participants experienced strong feelings of fear upon receiving a positive HIV test result...
December 2017: AIDS Education and Prevention: Official Publication of the International Society for AIDS Education
https://www.readbyqxmd.com/read/29274643/increased-efficacy-and-safety-of-enteral-nutrition-support-with-a-protocol-asnet-in-noncritical-patients-a-randomized-controlled-trial
#9
Luis Alfonso Ortíz-Reyes, Lilia Castillo-Martínez, Arianne Itzel Lupián-Angulo, Daniel Dante Yeh, Héctor Isaac Rocha-González, Aurora Elizabeth Serralde-Zúñiga
BACKGROUND: Unintentional underfeeding is common in patients receiving enteral nutrition (EN), and is associated with increased risk of malnutrition complications. Protocols for EN in critically ill patients have been shown to enhance adequacy, resulting in better clinical outcomes; however, outside of intensive care unit (ICU) settings, the influence of a protocol for EN is unknown. OBJECTIVE: To evaluate the efficacy and safety of implementing an EN protocol in a noncritical setting...
January 2018: Journal of the Academy of Nutrition and Dietetics
https://www.readbyqxmd.com/read/29217120/hydric-environmental-effects-on-turtle-development-and-sex-ratio
#10
Itzel Sifuentes-Romero, Boris M Tezak, Sarah L Milton, Jeanette Wyneken
Experimental and field studies of different turtle species suggest that moisture influences embryonic development and sex ratios, wetter substrates tend to produce more males, and drier substrates produce more females. In this study, we used Trachemys scripta elegans to test the effect of moisture on embryonic development and sex ratios. T. s. elegans eggs were incubated under different temperature and moisture regimes. We monitored embryonic development until stage 22 (after sex determination) and, for the first time, we estimated sex ratios using a male-specific transcriptional molecular marker, Sox9...
November 28, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/29213048/in-vivo-evidence-for-homo-and-heterodimeric-interactions-of-arabidopsis-thaliana-dehydrins-atcor47-aterd10-and-atrab18
#11
Itzell E Hernández-Sánchez, Israel Maruri-López, Steffen P Graether, Juan F Jiménez-Bremont
Dehydrins (DHNs) are intrinsically disordered proteins that play central roles in plant abiotic stress responses; however, how they work remains unclear. Herein, we report the in planta subcellular localization of Arabidopsis thaliana DHNs AtCOR47, AtERD10, and AtRAB18 through GFP translational fusions. To explore the dimerization ability of the Arabidopsis acidic DHNs AtCOR47 and AtERD10, we conducted an in planta DHN binding assay using the Bimolecular Fluorescence Complementation (BiFC) technique. Our analyses revealed homodimeric interactions for AtCOR47 and AtERD10; interestingly, heterodimeric associations also occurred with these DHNs, and these interactions were observed in the cytosol of tobacco cells...
December 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29202370/endocrine-effects-after-ozonation-of-tamoxifen
#12
Oliver Knoop, Fabian Itzel, Jochen Tuerk, Holger V Lutze, Torsten C Schmidt
Ozonation is used as additional wastewater treatment option to remove recalcitrant micropollutants. It also removes the estrogenic activity found in wastewater but not always the anti-estrogenic activity. This can be explained by an incomplete removal of anti-estrogenic micropollutants or by formation of transformation products (TPs) which retain the activity. The present study investigates the degradation of the anti-estrogenic pharmaceutical tamoxifen in pure water, regarding TP formation and related anti-estrogenic effect using Arxula adeninivorans yeast estrogen screen (A-YES)...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29182874/revisiting-nitrogen-species-in-covalent-triazine-frameworks
#13
Dmitrii Yu Osadchii, Alma Itzel Olivos Suarez, Anastasiya V Bavykina, Jorge Gascon
Covalent triazine frameworks (CTFs) are porous organic materials promising for applications in catalysis and separation due to their high stability, adjustable porosity and intrinsic nitrogen functionalities. CTFs are prepared by ionothermal trimerization of aromatic nitriles, however, multiple side reactions also occur under synthesis conditions, and their influence on the material properties is still poorly described. Here we report the systematic characterization of nitrogen in CTFs using X-ray photoelectron spectroscopy (XPS)...
November 28, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29157674/circulating-concentrations-of-advanced-glycation-end-products-its-association-with-the-development-of-diabetes-mellitus
#14
Itzel Uribe Jiménez, Eulises Díaz-Díaz, Jorge Salmerón Castro, Julia Pérez Ramos, Mario Cárdenas León, José Antonio Alvarado Ríos, Juan Carlos Auriostigue Bautista, Ricardo Correa-Rotter, Carlos Alberto Aguilar Salinas, Fernando Larrea
BACKGROUND: Diabetes Mellitus (DM) is characterized by the production and accumulation of advanced glycation end products (AGEs), which are one of the key mechanisms in the development of its chronic complications. AIMS OF THE STUDY: To assess the serum AGEs concentration by a radioimmunoassay (RIA) developed in our laboratory, to establish reference values in healthy population and to evaluate the diagnostic potential of measuring longitudinal changes in circulating AGEs concentrations to predict the development of DM...
May 2017: Archives of Medical Research
https://www.readbyqxmd.com/read/29149190/improved-capture-of-drosophila-suzukii-by-a-trap-baited-with-two-attractants-in-the-same-device
#15
Rodrigo Lasa, Eduardo Tadeo, Ricardo A Toledo-Hérnandez, Lino Carmona, Itzel Lima, Trevor Williams
The improvement of trap-lure combinations is an important part of integrated pest management programs that involve monitoring pests for timely insecticide applications, or for their use in control strategies such as mass trapping or bait stations. In this study improvements in the capture of Drosophila suzukii were not observed following the inclusion of different color stimuli with respect to a red-black stripe cup trap. This red-black stripe trap with a hemispherical dome-shaped lid had a significantly improved physical retention of flies compared to traps fitted with a flat lid...
2017: PloS One
https://www.readbyqxmd.com/read/29131710/fluorescence-spectroscopy-as-a-tool-for-the-assessment-of-liver-samples-with-several-stages-of-fibrosis
#16
Diego A Fabila-Bustos, Úrsula D Arroyo-Camarena, María D López-Vancell, Marco A Durán-Padilla, Itzel Azuceno-García, Suren Stolik-Isakina, Alma Valor-Reed, Elizabeth Ibarra-Coronado, Luis F Hernández-Quintanar, Galileo Escobedo, José M de la Rosa-Vázquez
During the last years, fluorescence spectroscopy has been used as a potential tool for the evaluation and characterization of tissues with different disease conditions due to its low cost, high sensitivity, and minimally or noninvasive character. In this study, fluorescence spectroscopy was used to study 19 paraffin blocks containing human liver tissue from biopsies. All samples were previously analyzed by two senior pathologists in a single-blind trial. After their evaluation, four liver samples were classified as nonfibrosis (F0), four as initial fibrosis (F1-F2), four as advanced fibrosis (F3), and six as cirrhosis (F4)...
November 13, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29124067/labor-induction-with-orally-administrated-misoprostol-a-retrospective-cohort-study
#17
Tove Wallstrom, Hans Jarnbert-Pettersson, David Stenson, Helena Akerud, Elisabeth Darj, Kristina Gemzell-Danielsson, Eva Wiberg-Itzel
Introduction: One great challenge in obstetric care is labor inductions. Misoprostol has advantages in being cheap and stable at room temperature and available in resource-poor settings. Material and Methods: Retrospective cohort study of 4002 singleton pregnancies with a gestational age ≥34 w at Sodersjukhuset, Stockholm, during 2009-2010 and 2012-2013. Previously used methods of labor induction were compared with misoprostol given as a solution to drink, every second hour...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29121359/single-spot-yellow-laser-versus-conventional-green-laser-on-panretinal-photocoagulation-patient-pain-scores-and-preferences
#18
Gerardo González-Saldivar, Sergio Rojas-Juárez, Itzel Espinosa-Soto, Jorge Sánchez-Ramos, Noel Jaurieta-Hinojosa, Abel Ramírez-Estudillo
BACKGROUND AND OBJECTIVE: Panretinal photocoagulation (PRP) is the mainstay therapy for proliferative diabetic retinopathy. Pain during and after its application is a complication that affects patients' therapeutic adherence. This study aimed to compare pain perception and patient preference for the 577-nm yellow laser (YL-577) (LIGHTL as 577; LIGHTMED, San Clemente, CA) and the conventional 532-nm green laser (GL-532) (Purepoint Laser; Alcon, Fort Worth, TX) with PRP. PATIENTS AND METHODS: A total of 92 patient eyes with proliferative diabetic retinopathy treated with PRP were randomly assigned to receive both GL-532 and YL-577 (184 eyes) - one on each eye, with the order of application randomized, as well...
November 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/29050338/tumor-infiltrating-b-cells-producing-antitumor-active-immunoglobulins-in-resected-hcc-prolong-patient-survival
#19
Stefan M Brunner, Timo Itzel, Christoph Rubner, Rebecca Kesselring, Eva Griesshammer, Matthias Evert, Andreas Teufel, Hans J Schlitt, Stefan Fichtner-Feigl
BACKGROUND & AIMS: The immunological microenvironment of HCC influences patient outcome, however, the role of B cells remains unclear. This study investigated effects of local B-cell infiltration in HCC cohorts on patient survival and immunological and molecular tumor microenvironment. RESULTS: Unsupervised gene expression analysis of full cancer transcriptomes (N=2158) revealed a highly co-regulated immunological cluster in HCC that mainly contained immunoglobulin fragments...
September 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29030443/a-novel-metabolic-pathway-for-n-methylpyrrolidone-degradation-in-alicycliphilus-sp-bq1
#20
Claudia Julieta Solís-González, Lilianha Domínguez-Malfavón, Martín Vargas-Suárez, Itzel Gaytán, Miguel Ángel Cevallos, Luis Lozano, M Javier Cruz-Gómez, Herminia Loza-Tavera
The molecular mechanisms underlying the biodegradation of N-Methylpyrrolidone (NMP), a widely used industrial solvent that produces skin irritation in humans, and is teratogenic in rats, are unknown. Alicycliphilus sp. BQ1 degrades NMP. By studying a transposon-tagged mutant unable to degrade NMP, we identified a six-gene cluster (nmpABCDEF), transcribed as a polycistronic mRNA, encoding enzymes involved in NMP biodegradation. nmpA and the transposon-affected gene nmpB encode a N-methylhydantoin amidohydrolase that would transform NMP to γ-N-methylaminobutyric acid; this would be metabolized by an aminoacid oxidase (NMPC), either by demethylation to produce γ-aminobutyric acid (GABA), or by deamination to produce succinate semialdehyde (SSA)...
October 13, 2017: Applied and Environmental Microbiology
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