Randall Library Home

New Scholarship from UNCW Faculty

Syndicate content

Multiple conducting systems in the cubomedusa Carybdea marsupialis.


Related Articles

Multiple conducting systems in the cubomedusa Carybdea marsupialis.

Biol Bull. 2014 Dec;227(3):274-84

Authors: Satterlie RA

Abstract
Acute responses to mechanical, electrical, and photic stimuli were used to describe neural conducting systems in the cubomedusan jellyfish Carybdea marsupialis underlying three behaviors: contractile responses of single tentacles, protective crumple responses, and alterations of swimming activity by the visual system. Responses of single tentacles consisted of tentacular shortening and inward pedalial bending, and were accompanied by bursts of extracellularly recorded spike activity that were restricted to the stimulated tentacle. With nociceptive stimuli delivered to the subumbrella or margin, all four tentacles produced similar responses in a crumple response. The spike bursts in all four tentacles showed coordinated firing as long as the nerve ring was intact. Crumples were still produced following cuts through the nerve ring, but the activity in individual tentacles was no longer coordinated. Responses to light-on stimulation of a rhopalium, as recorded from the pacemaker region, were weak and inconsistent, but when present, resulted in a stimulation of swimming activity. In comparison, light-off responses were robust and resulted in temporary inhibition of swimming activity. Light-off responses were conducted in the nerve ring to unstimulated rhopalia. In conclusion, three conducting systems have been described as components of the rhopalia-nerve ring centralized system in Carybdea: the swim motor system, the crumple coordination system, and the light-off response system.

PMID: 25572215 [PubMed - indexed for MEDLINE]

Distribution of Na,K-ATPase α subunits in rat vestibular sensory epithelia.


Related Articles

Distribution of Na,K-ATPase α subunits in rat vestibular sensory epithelia.

J Assoc Res Otolaryngol. 2014 Oct;15(5):739-54

Authors: Schuth O, McLean WJ, Eatock RA, Pyott SJ

Abstract
The afferent encoding of vestibular stimuli depends on molecular mechanisms that regulate membrane potential, concentration gradients, and ion and neurotransmitter clearance at both afferent and efferent relays. In many cell types, the Na,K-ATPase (NKA) is essential for establishing hyperpolarized membrane potentials and mediating both primary and secondary active transport required for ion and neurotransmitter clearance. In vestibular sensory epithelia, a calyx nerve ending envelopes each type I hair cell, isolating it over most of its surface from support cells and posing special challenges for ion and neurotransmitter clearance. We used immunofluorescence and high-resolution confocal microscopy to examine the cellular and subcellular patterns of NKAα subunit expression within the sensory epithelia of semicircular canals as well as an otolith organ (the utricle). Results were similar for both kinds of vestibular organ. The neuronal NKAα3 subunit was detected in all afferent endings-both the calyx afferent endings on type I hair cells and bouton afferent endings on type II hair cells-but was not detected in efferent terminals. In contrast to previous results in the cochlea, the NKAα1 subunit was detected in hair cells (both type I and type II) but not in supporting cells. The expression of distinct NKAα subunits by vestibular hair cells and their afferent endings may be needed to support and shape the high rates of glutamatergic neurotransmission and spike initiation at the unusual type I-calyx synapse.

PMID: 25091536 [PubMed - indexed for MEDLINE]

View ProQuest search results


Follow the link to view all documents in ProQuest for your search

Children's Number-Line Estimation Shows Development of Measurement Skills (Not Number Representations).


Developmental Psychology; 06/01/2014
(AN 96249186)
Criminal Justice Abstracts

Applying a Resiliency Model to Community Reintegration and Needs in Families with Traumatic Brain Injury: Implications for Rehabilitation Counselors.


Journal of Applied Rehabilitation Counseling; 03/01/2014
(AN 95045799)
Criminal Justice Abstracts

Introduction to the Special Issue on Queer/ing Criminology: New Directions and Frameworks.


Critical Criminology; 03/01/2014
(AN 94317402)
Criminal Justice Abstracts

Success or sorrow: the paradoxical view of crime control campaigns in China.


International Journal of Comparative & Applied Criminal Justice; 01/01/2014
(AN 93018776)
Criminal Justice Abstracts

Use of Craniofacial Superimposition in Historic Investigation.


Journal of Forensic Sciences (Wiley-Blackwell); 01/01/2014
(AN 93569166)
Criminal Justice Abstracts

View ProQuest search results


Follow the link to view all documents in ProQuest for your search

Women Physicians and Professional Ethos in Nineteenth-Century America , by Carolyn Skinner.


RSQ: Rhetoric Society Quarterly; 08/01/2014
(AN 97901734)
Communication & Mass Media Complete

Renovating Rhetoric in Christian Tradition, 2014.


American Communication Journal; 06/01/2014
(AN 97065126)
Communication & Mass Media Complete

The Impact of Presentation Form, Entrepreneurial Passion, and Perceived Preparedness on Obtaining Grant Funding.


Journal of Business & Technical Communication; 04/01/2014
(AN 94842156)
Communication & Mass Media Complete

Unfortunately, we are unable to locate the alert you have requested.


This alert might have been deleted or expired or you have entered an invalid address. Please check the URL of your alert or create a new alert.

Modified fully discretized projection method for the incompressible Navier–Stokes equations


Publication date: October 2015
Source:Applied Numerical Mathematics, Volume 96

Author(s): Daniel X. Guo

The stability and convergence of a second-order fully discretized projection method for the incompressible Navier–Stokes equations is studied. In order to update the pressure field faster, modified fully discretized projection methods are proposed. It results in a nearly second-order method. This method sacrifices a little of accuracy, but it requires much less computations at each time step. It is very appropriate for actual computations. The comparison with other methods for the driven-cavity problem is presented.





SBIRT Implementation for Adolescents in Urban Federally Qualified Health Centers


Publication date: Available online 26 June 2015
Source:Journal of Substance Abuse Treatment

Author(s): Shannon Gwin Mitchell , Robert P. Schwartz , Arethusa S. Kirk , Kristi Dusek , Marla Oros , Colleen Hosler , Jan Gryczynski , Carolina Barbosa , Laura Dunlap , David Lounsbury , Kevin E. O’Grady , Barry S. Brown

Background Alcohol, tobacco, and other drug use remains highly prevalent among US adolescents and is a threat to their well-being and to the public health. Clinical trials and meta-analyses evidence supports the effectiveness of Screening, Brief Intervention and Referral to Treatment (SBIRT) for adolescents with substance misuse but primary care providers have been slow to adopt this evidence-based approach. The purpose of this paper is to describe the theoretically informed methodology of an on-going implementation study. Methods This study protocol is a multi-site, cluster randomized trial (N = 7) guided by Proctor’s conceptual model of implementation research and comparing two principal approaches to SBIRT delivery within adolescent medicine: Generalist vs. Specialist. In the Generalist Approach, the primary care provider delivers brief intervention (BI) for substance misuse. In the Specialist Approach, BIs are delivered by behavioral health counselors. The study will also examine the effectiveness of integrating HIV risk screening within an SBIRT model. Implementation Strategies employed include: integrated team development of the service delivery model, modifications to the electronic medical record, regular performance feedback and supervision. Implementation outcomes, include: Acceptability, Appropriateness, Adoption, Feasibility, Fidelity, Costs/Cost-Effectiveness, Penetration, and Sustainability. Discussion The study will fill a major gap in scientific knowledge regarding the best SBIRT implementation strategy at a time when SBIRT is poised to be brought to scale under health care reform. It will also provide novel data to inform the expansion of the SBIRT model to address HIV risk behaviors among adolescents. Finally, the study will generate important cost data that offers guidance to policymakers and clinic directors about the adoption of SBIRT in adolescent health care.