Guillermo A. Herrera

University of South Alabama

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Elba A. Turbat‐Herrera

University of South Alabama

Firas Al-Delfi

Louisiana State University Health Sciences Center Shreveport

Mauricio F. Landaeta

Viña del Mar University

Bernhard E. F. Reimann

Institute of Molecular Biotechnology

Presentación Carrillo

Universidad de Granada

Xin Gu

Tongji University

Bruce Alexander

Iowa City VA Health Care System

Carolyn B. Bridges

Natera (United States)

C. Bruce Alexander

American Society of Safety Professionals

Leonardo R. Castro

University of Concepción

Cooperative Institutions

University of Alabama at Birmingham

Louisiana State University Health Sciences Center Shreveport

Centers for Disease Control and Prevention

University of Alabama

Louisiana State University

Louisiana State University in Shreveport

Children's National

Harvard University

Centre National de la Recherche Scientifique

Instituto de Astrofísica de Canarias

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The Value of Electron Microscopy in the Diagnosis and Clinical Management of Lupus Nephritis

Ultrastructural Pathology (1999)

Guillermo A. Herrera

The diagnosis and clinical management of patients with lupus nephritis can be a challenge from a clinicopathologic point of view. Although the majority of patients that are biopsied already have either an established clinical diagnosis or a presumptive diagnosis of systemic lupus erythematosus, determination of the immunomorphologic characteristics, pattern, and distribution of renal involvement is important for clinical management. In a clear subset of these patients with lupus nephritis, electron microscopy plays a pivotal role in accurately characterizing the type of renal involvement and determining the degree of activity, providing useful and objective guides for patients' management. Ultrastructural evaluation can also be crucial in the initial diagnosis of patients with lupus who, at the time of biopsy, lack either diagnostic clinical manifestations and/or serologic markers, and are therefore clinically unsuspected. Electron microscopic evaluation also plays a significant role in the evaluation of renal dysfunction in transplant patients with lupus nephritis, helping to determine whether recurrence of the lupus has occurred in the renal allograft. There are some ultrastructural findings that, although not pathognomonic, in the proper clinico-pathologic context are very suggestive or even diagnostic of lupus nephritis. Correlating light, immunofluorescence, and electron microscopic findings within the clinical context of lupus nephritis cases is crucial for appropriate clinical management. In some of these patients, electron microscopy provides key information that cannot be otherwise obtained.

Pathognomonic

Nephritis

10.1080/019131299281725

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Citations (50)

Evaluación de la eficiencia del coagulante SuperFloc SD 2080 frente al cloruro férrico en procesos de clarificación de agua

Revista de Iniciación Científica (2020)

Erick Vallester Anel Alcedo Jesús Bravo Kelly Castrjo Guillermo A. Herrera

En esta evaluación se estudió los coagulantes cloruro férrico y SuperFloc SD 2080, con el objetivo de comparar su efectividad en los procesos de clarificación de agua. Se realizó el estudio con diferentes dosis de coagulante: 3 ml, 5 ml, 6 ml, 7 ml, 8 ml y 10 ml, sometiéndolas a los procesos de floculación, coagulación y sedimentación. También se realizaron pruebas de jarras, prueba de sedimentación con Cono Imhoff y la prueba de columna de sedimentación. Para determinar la eficiencia de los coagulantes estudiados para la prueba de jarras, las dosis utilizadas fueron: 5 ml por cada dos litros para el cloruro férrico y 6 ml por cada dos litros para el SuperFloc SD2080. Con la prueba de columna de sedimentación, los resultados fueron determinados mediante la curva de porcentaje de isoremoción. La prueba de columna de sedimentación se realizó en dos intervalos de tiempo, en donde los dos primeros intervalos, fueron de cinco minutos y los demás intervalos consiguientes fueron de cada diez minutos hasta llegar a los 120 minutos. Para un tiempo calculado de 57 minutos, los resultados de porcentaje de remoción para el cloruro férrico fueron de 83 % y 37% para el SuperFloc SD 2080, lo que indica que el coagulante de cloruro férrico fue más eficiente para la remoción de sólidos suspendidos en el agua.

10.33412/rev-ric.v6.2.2898

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Influenza vaccine effectiveness among 50–64-year-old persons during a season of poor antigenic match between vaccine and circulating influenza virus strains: Colorado, United States, 2003–2004

Vaccine (2006)

Guillermo A. Herrera Marika K. Iwane Margaret M. Cortese Cedric Brown Ken Gershman

Telephone survey

Influenza season

10.1016/j.vaccine.2006.05.129

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The status of the QUIJOTE multi-frequency instrument

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2012)

R. J. Hoyland M. Aguiar-González B. Aja J. Ariño E. Artal

The QUIJOTE-CMB project has been described in previous publications.Here we present the current status of the QUIJOTE multi-frequency instrument (MFI) with five separate polarimeters (providing 5 independent sky pixels): two which operate at 10-14 GHz, two which operate at 16-20 GHz, and a central polarimeter at 30 GHz.The optical arrangement includes 5 conical corrugated feedhorns staring into a dual reflector crossed-draconian system, which provides optimal cross-polarization properties (designed to be < -35 dB) and symmetric beams.Each horn feeds a novel cryogenic on-axis rotating polar modulator which can rotate at a speed of up to 1 Hz.The science driver for this first instrument is the characterization of the galactic emission.The polarimeters use the polar modulator to derive linear polar parameters Q, U and I and switch out various systematics.The detection system provides optimum sensitivity through 2 correlated and 2 total power channels.The system is calibrated using bright polarized celestial sources and through a secondary calibration source and antenna.The acquisition system, telescope control and housekeeping are all linked through a real-time gigabit Ethernet network.All communication, power and helium gas are passed through a central rotary joint.The time stamp is synchronized to a GPS time signal.The acquisition software is based on PLCs written in Beckhoffs TwinCat and ethercat.The user interface is written in LABVIEW.The status of the QUIJOTE MFI will be presented including pre-commissioning results and laboratory testing.

Polarimeter

Instrument control

10.1117/12.925349

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Citations (21)

Record of a larval whalefish (family Cetomimidae) from near the Juan Fernandez seamounts, southeastern Pacific Ocean Registro de una larva de pez ballena (familia Cetomimidae) de las cercanías a los montes submarinos de Juan Fernández, océano Pacífico suroriental

Guillermo A. Herrera Mauricio F. Landaeta Leonardo R. Castro

The finding of a late flexion cetomimid specimen of 24.6 mm body length (BL), plus a caudal streamer of 5.7 mm, collected in the southeastern Pacific near the Juan Fernandez seamounts (33.565°S; 77.710°W), is reported. The specimen was in good condition, almost fully pigmented, covered by small melanophores from the head to the caudal streamer, where the pigmentation is denser. It possesses an upturned mouth, developing pelvic fins with a high insertion, 14 dorsal and 15 anal fin rays, 7+7 principal caudal fin rays, ca. 54 myomeres, and a preanal distance of 75% BL. Based on the available information, the specimen can be tentatively ascribed to a species of Gyrinomimus or Cetomimus.

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Fish fin

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Oat Cell Carcinoma of the Trachea: A Case Report with Electron Microscopy

Ultrastructural Pathology (1983)

Jack C. Chaffin Guillermo A. Herrera C Roberts

This report presents the light and electron microscopic findings in the tenth reported case of oat cell carcinoma of the trachea. Typical neurosecretory granules are found, the first demonstrated in tumors of this type.

Oat cell carcinoma

10.3109/01913128309140572

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Citations (3)

Are the small-sized plankton communities of oligotrophic ecosystems resilient to UVR and P pulses?

Freshwater Science (2017)

Carmen Rojo Guillermo A. Herrera Juan Manuel Medina‐Sánchez Manuel Villar‐Argáiz C. Durán

Evaluating how environmental stressor interactions influence ecosystem structure and functioning is critical to understanding the response of ecosystems to global change. We exposed a species-poor planktonic community to P pulses in the absence and presence of solar ultraviolet radiation (UVR). We used a field-mesocosm study in an oligotrophic mid-altitude lake to test the hypothesis that interaction between these factors affects the community's diversity and composition, but not its biomass-size spectrum, making this community resilient in terms of its C-transfer function. Our findings show that P pulses and UVR affected the relative abundance of different planktonic populations. The abundance of phytoplankton was enhanced strongly by P pulses and secondarily by UVR. The UVR × P interaction affected only the smallest autotrophic species. Chlorococcal abundance increased, whereas chroococcal cyanobacteria decreased. However, UVR had a much more pronounced effect than P on the composition of microcrustaceans, and both factors interactively affected their biomass. Hence, the biomass-size spectrum was not resilient to the UVR × P pulse interaction. The steepness of the slope increased under P-pulse conditions because zooplankton were not able to grow concomitantly with phytoplankton, as confirmed by the low zooplankton to phytoplankton biomass ratio (Z∶P). The observed planktonic changes under new foreseeable conditions that include an increase in UVR fluxes and P inputs might decouple the C cycle in inland oligotrophic lakes in the Mediterranean region.

Mesocosm

10.1086/694737

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Citations (7)

Microscopic Polyangitis Associated with Head and Neck Cancer

Journal of Investigative Medicine (2005)

E. Mubashir M. M. Ahmed Guillermo A. Herrera S.M. Berney

10.1177/1081558905053001528

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Dendritic cells in renal biopsies of patients with acute tubulointerstitial nephritis

Human Pathology (2016)