The Relationship Between M in “Calibrated fMRI” and the Physiologic Modulators of fMRI

The “calibrated fMRI” technique requires a hypercapnia calibration experiment in order to estimate the factor “M”. It is desirable to be able to obtain the M value without the need of a gas challenge calibration. According to the analytical expression of M, it is a function of several baseline physiologic parameters, such as baseline venous oxygenation and CBF, both of which have recently been shown to be significant modulators of fMRI signal. Here we studied the relationship among hypercapnia-calibrated M, baseline venous oxygenation and CBF, and assessed the possibility of estimating M from the baseline physiologic parameters. It was found that baseline venous oxygenation and CBF are highly correlated (R2=0.77, P<0.0001) across subjects. However, the hypercapnia-calibrated M was not correlated with baseline venous oxygenation or CBF. The hypercapnia-calibrated M was not correlated with an estimation of M based on analytical expression either. The lack of correlation may be explained by the counteracting effect of venous oxygenation and CBF on the M factor, such that the actual M value of an individual may be mostly dependent on other parameters such as hematocrit. Potential biases in hypercapnia-based M estimation were also discussed in the context of possible reduction of CMRO2 during hypercapnia

Identification of antisense nucleic acid hybridization sites in mRNA molecules with self-quenching fluorescent reporter molecules

We describe a physical mRNA mapping strategy employing fluorescent self-quenching reporter molecules (SQRMs) that facilitates the identification of mRNA sequence accessible for hybridization with antisense nucleic acids in vitro and in vivo, real time. SQRMs are 20–30 base oligodeoxynucleotides with 5–6 bp complementary ends to which a 5′ fluorophore and 3′ quenching group are attached. Alone, the SQRM complementary ends form a stem that holds the fluorophore and quencher in contact. When the SQRM forms base pairs with its target, the structure separates the fluorophore from the quencher. This event can be reported by fluorescence emission when the fluorophore is excited. The stem–loop of the SQRM suggests that SQRM be made to target natural stem–loop structures formed during mRNA synthesis. The general utility of this method is demonstrated by SQRM identification of targetable sequence within c-myb and bcl-6 mRNA. Corresponding antisense oligonucleotides reduce these gene products in cells

Self-explaining Hierarchical Model for Intraoperative Time Series

Major postoperative complications are devastating to surgical patients. Some of these complications are potentially preventable via early predictions based on intraoperative data. However, intraoperative data comprise long and fine-grained multivariate time series, prohibiting the effective learning of accurate models. The large gaps associated with clinical events and protocols are usually ignored. Moreover, deep models generally lack transparency. Nevertheless, the interpretability is crucial to assist clinicians in planning for and delivering postoperative care and timely interventions. Towards this end, we propose a hierarchical model combining the strength of both attention and recurrent models for intraoperative time series. We further develop an explanation module for the hierarchical model to interpret the predictions by providing contributions of intraoperative data in a fine-grained manner. Experiments on a large dataset of 111,888 surgeries with multiple outcomes and an external high-resolution ICU dataset show that our model can achieve strong predictive performance (i.e., high accuracy) and offer robust interpretations (i.e., high transparency) for predicted outcomes based on intraoperative time series

Photo-enhanced lithium-ion batteries using metal-organic framework

The development of photo-enhanced lithium-ion batteries, where exposing the electrodes to light results in higher capacities, higher rate performance or self-charging, has recently gained substantial traction. The challenge in these devices lies in the realisation of photo-electrodes with good optical and electrochemical properties. Herein, we propose copperhexahydroxybenzene as the active photo-electrode material which both harvests light and stores energy. This material was mixed with reduced graphene oxide as a conductive additive and charge transfer medium to create photo-active electrodes. Under illumination, these electrodes show improved charge storage kinetics resulting in the photo-accelerated charging and discharging performance (i.e. specific capacities improvement from 107 mAh g-1 to 126 mAh g-1 at 200 mA g-1 and 79 mAh g-1 to 97 mAh g-1 at 2000 mA g-1 under 1 sun illumination as compared to dark)

Validating an Agency-based Tool for Measuring Women's Empowerment in a Complex Public Health Trial in Rural Nepal.

Despite the rising popularity of indicators of women's empowerment in global development programmes, little work has been done on the validity of existing measures of such a complex concept. We present a mixed methods validation of the use of the Relative Autonomy Index for measuring Amartya Sen's notion of agency freedom in rural Nepal. Analysis of think-aloud interviews (n = 7) indicated adequate respondent understanding of questionnaire items, but multiple problems of interpretation including difficulties with the four-point Likert scale, questionnaire item ambiguity and difficulties with translation. Exploratory Factor Analysis of a calibration sample (n = 511) suggested two positively correlated factors (r = 0.64) loading on internally and externally motivated behaviour. Both factors increased with decreasing education and decision-making power on large expenditures and food preparation. Confirmatory Factor Analysis on a validation sample (n = 509) revealed good fit (Root Mean Square Error of Approximation 0.05-0.08, Comparative Fit Index 0.91-0.99). In conclusion, we caution against uncritical use of agency-based quantification of women's empowerment. While qualitative and quantitative analysis revealed overall satisfactory construct and content validity, the positive correlation between external and internal motivations suggests the existence of adaptive preferences. High scores on internally motivated behaviour may reflect internalized oppression rather than agency freedom

Changing Tides: Screening for Social Determinants of Health in Asian American and Native Hawaiian/Pacific Islander Communities

Change InSight is an information clearinghouse for the nation's Asian American, Native Hawaiian, and Pacific Islander (AA and NHPI) communities as well as other underrepresented communities (e.g. immigrant communities, communities of color, racial minority groups, vulnerable populations, etc.). Change InSight leverages data to understand minority communities at a deeper level, empowering these communities by:Identifying and addressing the social risks and needs unique to AA and NHPI populations through targeted data collection infrastructure;Challenging misconceptions about the AA and NHPI populations using the collected data;Increase awareness of the shortfall in foundation funding for AA and NHPI organizations relative to these communities' population size and growth; andInforming decision-making at a broader scale through data-backed policy insights.This report shows how Change InSight is working to eliminate health and funding disparities for AA and NHPI communities. For far too long, the AA and NHPI communities have been categorized as a single entity (i.e. "Asians" or "Asian Americans"), leading to a critical lack of culturally-responsive interventions, solutions, and resources. To understand what these communities need, it's important to consider how environmental and personal conditions impact health outcomes. These conditions are known as social determinants of health (SDOH/SDH)2.From April 1st to June 24th, 2022, Change InSight partner agencies collected social determinants of health data from 2,244 AA and NHPI individuals. Findings from this sample were then compared with public narratives from multiple sources and supplemented by anecdotal evidence from all involved stakeholders. This new research initiative offers policymakers, nonprofit leaders, community health workers, philanthropic organizations, and civic centers a better understanding of their clients and constituents. This report is a product of a year-long collaboration by nonprofit leaders, providers, and community advocates seeking to identify, educate, and fund targeted social service solutions addressing the needs of AA and NHPI and other immigrant communities