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Filter Results:

Year

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Author

  • Agrahari, Vibhuti (1)
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Work 1-4 of 4

Sorted by relevance

Article

In vivo measurement of trabecular meshwork stiffness in a corticosteroid-induced ocular hypertensive mouse model

by Guorong Li; Chanyoung Lee; Vibhuti Agrahari; Ke Wang; Iris Navarro; Joseph M. Sherwood; Karen Crews; Sina Farsiu; Pedro Gonzalez; Cheng-Wen Lin; Ashim K. Mitra; Ross Ethier; W. Daniel Stamer

2019

Subjects
  • Health Sciences, Opthamology
  • Engineering, Biomedical
  • Chemistry, Pharmaceutical
  • File Download
  • View Abstract

Abstract:Close

Ocular corticosteroids are commonly used clinically. Unfortunately, their administration frequently leads to ocular hypertension, i.e., elevated intraocular pressure (IOP), which, in turn, can progress to a form of glaucoma known as steroid-induced glaucoma. The pathophysiology of this condition is poorly understood yet shares similarities with the most common form of glaucoma. Using nanotechnology, we created a mouse model of corticosteroid-induced ocular hypertension. This model functionally and morphologically resembles human ocular hypertension, having titratable, robust, and sustained IOPs caused by increased resistance to aqueous humor outflow. Using this model, we then interrogated the biomechanical properties of the trabecular meshwork (TM), including the inner wall of Schlemm’s canal (SC), tissues known to strongly influence IOP and to be altered in other forms of glaucoma. Specifically, using spectral domain optical coherence tomography, we observed that SC in corticosteroid-treated mice was more resistant to collapse at elevated IOPs, reflecting increased TM stiffness determined by inverse finite element modeling. Our noninvasive approach to monitoring TM stiffness in vivo is applicable to other forms of glaucoma and has significant potential to monitor TM function and thus positively affect the clinical care of glaucoma, the leading cause of irreversible blindness worldwide.

Article

Beyond the Definitions of the Phenotypic Complications of Sickle Cell Disease: An Update on Management

by Samir K. Ballas; Muge R. Kesen; Morton F. Goldberg; Gerard A. Lutty; Carlton Dampier; Ifeyinwa Osunkwo; Winfred C. Wang; Carolyn Hoppe; Ward Hagar; Deepika S. Darbari; Punam Malik

2012

Subjects
  • Health Sciences, Opthamology
  • Health Sciences, General
  • File Download
  • View Abstract

Abstract:Close

The sickle hemoglobin is an abnormal hemoglobin due to point mutation (GAG → GTG) in exon 1 of the globin gene resulting in the substitution of glutamic acid by valine at position 6 of the globin polypeptide chain. Although the molecular lesion is a single-point mutation, the sickle gene is pleiotropic in nature causing multiple phenotypic expressions that constitute the various complications of sickle cell disease in general and sickle cell anemia in particular. The disease itself is chronic in nature but many of its complications are acute such as the recurrent acute painful crises (its hallmark), acute chest syndrome, and priapism. These complications vary considerably among patients, in the same patient with time, among countries and with age and sex. To date, there is no well-established consensus among providers on the management of the complications of sickle cell disease due in part to lack of evidence and in part to differences in the experience of providers. It is the aim of this paper to review available current approaches to manage the major complications of sickle cell disease. We hope that this will establish another preliminary forum among providers that may eventually lead the way to better outcomes.

Article

Understanding How Grammatical Aspect Influences Legal Judgment

by Andrew Sherrill; Anita Eerland; Rolf A. Zwaan; Joseph P. Magliano

2015

Subjects
  • Literature, General
  • Speech Communication
  • Psychology, Behavioral
  • File Download
  • View Abstract

Abstract:Close

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Recent evidence suggests that grammatical aspect can bias how individuals perceive criminal intentionality during discourse comprehension. Given that criminal intentionality is a common criterion for legal definitions (e.g., first-degree murder), the present study explored whether grammatical aspect may also impact legal judgments. In a series of four experiments participants were provided with a legal definition and a description of a crime in which the grammatical aspect of provocation and murder events were manipulated. Participants were asked to make a decision (first- vs. second-degree murder) and then indicate factors that impacted their decision. Findings suggest that legal judgments can be affected by grammatical aspect but the most robust effects were limited to temporal dynamics (i.e., imperfective aspect results in more murder actions than perfective aspect), which may in turn influence other representational systems (i.e., number of murder actions positively predicts perceived intentionality). In addition, findings demonstrate that the influence of grammatical aspect on situation model construction and evaluation is dependent upon the larger linguistic and semantic context. Together, the results suggest grammatical aspect has indirect influences on legal judgments to the extent that variability in aspect changes the features of the situation model that align with criteria for making legal judgments.

Article

In Vivo Tracking of Tissue Engineered Constructs

by Carmen J. Gil; Martin L. Tomov; Andrea S. Theus; Alexander Cetnar; Morteza Mahmoudi; Vahid Serpooshan

2019

Subjects
  • Engineering, Biomedical
  • Health Sciences, Medicine and Surgery
  • File Download
  • View Abstract

Abstract:Close

To date, the fields of biomaterials science and tissue engineering have shown great promise in creating bioartificial tissues and organs for use in a variety of regenerative medicine applications. With the emergence of new technologies such as additive biomanufacturing and 3D bioprinting, increasingly complex tissue constructs are being fabricated to fulfill the desired patient-specific requirements. Fundamental to the further advancement of this field is the design and development of imaging modalities that can enable visualization of the bioengineered constructs following implantation, at adequate spatial and temporal resolution and high penetration depths. These in vivo tracking techniques should introduce minimum toxicity, disruption, and destruction to treated tissues, while generating clinically relevant signal-to-noise ratios. This article reviews the imaging techniques that are currently being adopted in both research and clinical studies to track tissue engineering scaffolds in vivo, with special attention to 3D bioprinted tissue constructs.
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