Search results for: Ricardo Ortiz

Items from 1 to 14 out of 14 results

article

Continuous organelle separation in an insulator‐based dielectrophoretic device

Ricardo Ortiz, Domin Koh, Dai Hyun Kim, Mohammad Towshif Rabbani, more

Heterogeneity in organelle size has been associated with devastating human maladies such as neurodegenerative diseases or cancer. Therefore, assessing the size‐based subpopulation of organelles is imperative to understand the biomolecular foundations of these diseases. Here, we demonstrated a ratchet migration mechanism using insulator‐based dielectrophoresis in conjunction with a continuous flow...

article

Inside Front Cover: Continuous organelle separation in an insulator‐based dielectrophoretic device

Ricardo Ortiz, Domin Koh, Dai Hyun Kim, Mohammad Towshif Rabbani, more

ELECTROPHORESIS > 43 > 12 > NA - NA

DOI: 10.1002/elps.202100326 The (inside front) cover art shows a scanning electron image of the device used for the iDEP‐based continuous separation of organelles. The inset demonstrates the working mechanism of the devices showing a mixture of analytes injected in the center of a post‐array and being separated as they are steered through the posts. Small and large organelles are collected at the...

article

Collective All‐Carbon Magnetism in Triangulene Dimers**

Shantanu Mishra, Doreen Beyer, Kristjan Eimre, Ricardo Ortiz, more

Angewandte Chemie > 132 > 29 > 12139 - 12145

Triangular zigzag nanographenes, such as triangulene and its π‐extended homologues, have received widespread attention as organic nanomagnets for molecular spintronics, and may serve as building blocks for high‐spin networks with long‐range magnetic order, which are of immense fundamental and technological relevance. As a first step towards these lines, we present the on‐surface synthesis and a proof‐of‐principle...

article

Collective All‐Carbon Magnetism in Triangulene Dimers**

Shantanu Mishra, Doreen Beyer, Kristjan Eimre, Ricardo Ortiz, more

Angewandte Chemie International Edition > 59 > 29 > 12041 - 12047

article

Risk Factors for 30-Day Mortality in Patients with Methicillin-Resistant Staphylococcus aureus Bloodstream Infections

Pedro Ayau, Ana C. Bardossy, Guillermo Sanchez, Ricardo Ortiz, more

International Journal of Infectious Diseases > 2017 > 61 > C > 3-6

Methicillin-resistant Staphylococcus aureus (MRSA) blood stream infections (BSI) are a major health care problem accounting for a large percentage of nosocomial infections. The aim of this study was to identify risk factors associated with 30-day mortality in patients with MRSA BSI.This was a retrospective study performed in Southeast Michigan. Over a 9- year period, a total of 1,168 patients were...

chapter

Effects of visual latency on visual-haptic experience of stiffness

Bing Wu, Sung Hun Sim, Andinet Enquobahrie, Ricardo Ortiz

2015 Seventh International Workshop on Quality of Multimedia Experience (QoMEX) > 1 - 6

2015 Seventh International Workshop on Quality of Multimedia Experience (QoMEX)

In multimodal virtual-reality, augmented-reality, and tele-operation systems, a temporal asynchrony often exists between visual and haptic feedback due to differences in processing and rendering the two types of signals. We have conducted two psychophysical experiments to examine how such asynchrony influences our perceptual experience with an object's stiffness. Participants explored a virtual elastic...

article

Tetrahedral Image-to-Mesh Conversion Software for Anatomic Modeling of Arteriovenous Malformations

Fotis Drakopoulos, Ricardo Ortiz, Andinet Enquobahrie, Deanna Sasaki-Adams, more

Procedia Engineering > 2015 > 124 > Complete > 278-290

We describe a new implementation of an adaptive multi-tissue tetrahedral mesh generator targeting anatomic modeling of Arteriovenous Malformation (AVM) for surgical simulations. Our method, initially constructs an adaptive Body-Centered Cubic (BCC) mesh of high quality elements. Then, it deforms the mesh surfaces to their corresponding physical image boundaries, hence, improving the mesh fidelity...

article

Novel bronchoscopic strategies for the diagnosis of peripheral lung lesions: Present techniques and future directions

Christopher Gilbert, Jason Akulian, Ricardo Ortiz, Hans Lee, more

Respirology > 19 > 5 > 636 - 644

The diagnosis of the peripheral lung lesion has been a long‐standing clinical challenge—balancing accuracy with patient safety. With recent data revealing mortality benefits with lung cancer screening via low‐dose computed tomography, now more than ever, clinicians will be challenged with the task of providing the means to provide a safe and minimally invasive method of obtaining accurate tissue diagnostics...

article

Sexual behavior and locomotion induced by sexual cues in male rats following lesion of Lobules VIa and VII of the cerebellar vermis

Ricardo Ortiz-Pulido, Marta Miquel, Luis I. Garcia, Cesar A. Perez, more

Physiology & Behavior > 2011 > 103 > 3-4 > 330-335

The cerebellum is an important contributor to the neural basis of sexual behavior, but the specific cerebellar regions underlying different aspects of reproduction are still unknown. Here, we used experimental lesions of Lobules VIa and VII of the vermis to investigate their specific role, both in locomotion stimulated by sexual cues and the execution of sexual behavior. Sexually experienced male...

article

P22 Elevated levels of pentraxin 3 in HELLP syndrome and preeclampsia: GenPE study

Norma Serrano, Luis Alfonso Diaz, Carolina Paez, Ricardo Ortiz, more

Pregnancy Hypertension: An International Journal of Women's Cardiovascular... > 2010 > 1 > Supplement 1 > S48

article

P26 Homocysteine, folic acid and vitamin B12 serum levels and preeclampsia: A large-scale study from GenPE Study

Norma Serrano, Luis Alfonso Diaz, Carolina Paez, Ricardo Ortiz, more

Pregnancy Hypertension: An International Journal of Women's Cardiovascular... > 2010 > 1 > Supplement 1 > S49

article

Experimental testing of an annular denuder and filter system to measure gas–particle partitioning of semivolatile bifunctional carbonyls in the atmosphere

Ricardo Ortiz, Kenji Enya, Kazuhiko Sekiguchi, Kazuhiko Sakamoto

Atmospheric Environment > 2009 > 43 > 2 > 382-388

An annular denuder and filter-pack system was tested in combination with the use of the in-tube and on-fiber O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA)-derivatization technique to simultaneously sample and measure gaseous and particulate concentrations of semivolatile bifunctional carbonyl compounds in the atmosphere. Ozone was denuded from the sampling air to avoid oxidation...

article

Ambient air measurements of six bifunctional carbonyls in a suburban area

Ricardo Ortiz, Hiroyuki Hagino, Kazuhiko Sekiguchi, Qingyue Wang, more

Atmospheric Research > 2006 > 82 > 3-4 > 709-718

Low-molecular-weight carbonyl compounds, generated by photochemical reactions in the atmosphere and found in the exhaust of motor vehicles, have recently come to the attention of researchers because some of them are suspected carcinogens or mutagens. Six bifunctional carbonyl compounds were detected and measured in a suburban site 30 km northwest of the Tokyo metropolitan area. Samples were taken...

article

Some remarks on Fitzpatrick and Flynn's Grobner basis technique for Pade approximation

John B. Little, David Ortiz, Ricardo Ortiz-Rosado, Rebecca Pablo, more

Journal of Symbolic Computation > 2003 > 35 > 4 > 451-461

In Fitzpatrick and Flynn (J. Symbolic Comput. 13 (1992) 133), a Grobner basis technique for multivariable Padeapproximation problems was developed under a rather restrictive hypothesis on the shape of the numerator and denominator in relation to the approximation conditions desired. In this article, we show that their hypotheses can be replaced by other less stringent conditions, and we show how to...

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