GABA has a presynaptic inhibitory effect at Lumbricus terrestris body wall muscle synapses.

Earthworm body wall muscle synapses have been suggested to contain both excitatory and inhibitory inputs, and therefore allow for investigation of excitatory/inhibitory signaling in an easily accessible model system. While previous studies have focused on postsynaptic GABAergic inhibitory mechanisms, this study investigated the hypothesis that GABAergic signaling also has presynaptic inhibitory function. This hypothesis was tested by loading synaptogreen C4 dye (also called FM1-43) into presynaptic vesicles in the presence of GABA at Lumbricus terrestris longitudinal muscle synapses. GABA treatment significantly reduced the fluorescence intensity observed at these synapses, suggesting that GABAergic signaling does indeed have a presynaptic inhibitory mechanism.

A unique model of care for youth in crisis: A pilot open trial.

Suicide is the second leading cause of death for those ages 10-24 years in the United States, and emergency department (ED) visits due to youth self-injurious thoughts and behaviors (SITB) and increased substantially between 2016 and 2021. Although ED services are essential for an effective system of care, the ED setting is typically not well-suited for the comprehensive, collaborative, and therapeutic evaluation of SITB; treatment planning; and care coordination that youth in a suicidal crisis need. As a result, an urgent care model for mental health designed to provide comprehensive crisis triage and intervention services is needed within outpatient psychiatry. This pilot trial examined the feasibility, acceptability, and preliminary clinical outcomes of a brief, urgent care model, the Behavioral Health Crisis Care Clinic (CCC), designed to provide comprehensive outpatient triage and intervention services aimed at reducing suicide risk for youth in crisis. Participants were 189 youth (ages 10-20; 62.4% females; 58% Caucasian) who had past-week suicidal ideation or behavior and their caregivers. The results demonstrated the CCC model exceeded feasibility and acceptability benchmarks based on the Service Satisfaction Scale (M score > 3.00). CCC care was associated with significant decreases in self-reported suicide risk based on the Collaborative Assessment and Management of Suicidality Suicide Status Form with low levels of ED usage during CCC care (7.7%) and 1-month posttreatment (11.8%). Over 88% of patients without established outpatient care at the time of referral were connected to care during CCC treatment, almost all of whom (95%) continued with ongoing mental health care 1 month after ending CCC care. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

A large-scale study of the ultrawideband microwave dielectric properties of normal breast tissue obtained from reduction surgeries.

The efficacy of emerging microwave breast cancer detection and treatment techniques will depend, in part, on the dielectric properties of normal breast tissue. However, knowledge of these properties at microwave frequencies has been limited due to gaps and discrepancies in previously reported small-scale studies. To address these issues, we experimentally characterized the wideband microwave-frequency dielectric properties of a large number of normal breast tissue samples obtained from breast reduction surgeries at the University of Wisconsin and University of Calgary hospitals. The dielectric spectroscopy measurements were conducted from 0.5 to 20 GHz using a precision open-ended coaxial probe. The tissue composition within the probe's sensing region was quantified in terms of percentages of adipose, fibroconnective and glandular tissues. We fit a one-pole Cole-Cole model to the complex permittivity data set obtained for each sample and determined median Cole-Cole parameters for three groups of normal breast tissues, categorized by adipose tissue content (0-30%, 31-84% and 85-100%). Our analysis of the dielectric properties data for 354 tissue samples reveals that there is a large variation in the dielectric properties of normal breast tissue due to substantial tissue heterogeneity. We observed no statistically significant difference between the within-patient and between-patient variability in the dielectric properties.

A large-scale study of the ultrawideband microwave dielectric properties of normal, benign and malignant breast tissues obtained from cancer surgeries.

The development of microwave breast cancer detection and treatment techniques has been driven by reports of substantial contrast in the dielectric properties of malignant and normal breast tissues. However, definitive knowledge of the dielectric properties of normal and diseased breast tissues at microwave frequencies has been limited by gaps and discrepancies across previously published studies. To address these issues, we conducted a large-scale study to experimentally determine the ultrawideband microwave dielectric properties of a variety of normal, malignant and benign breast tissues, measured from 0.5 to 20 GHz using a precision open-ended coaxial probe. Previously, we reported the dielectric properties of normal breast tissue samples obtained from reduction surgeries. Here, we report the dielectric properties of normal (adipose, glandular and fibroconnective), malignant (invasive and non-invasive ductal and lobular carcinomas) and benign (fibroadenomas and cysts) breast tissue samples obtained from cancer surgeries. We fit a one-pole Cole-Cole model to the complex permittivity data set of each characterized sample. Our analyses show that the contrast in the microwave-frequency dielectric properties between malignant and normal adipose-dominated tissues in the breast is considerable, as large as 10:1, while the contrast in the microwave-frequency dielectric properties between malignant and normal glandular/fibroconnective tissues in the breast is no more than about 10%.