The Global Impact of COVID-19: Historical Development, Molecular Characterization, Drug Discovery and Future Directions.

In December 2019, an outbreak of a respiratory disease called the coronavirus disease 2019 (COVID-19) caused by a new coronavirus known as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) began in Wuhan, China. The SARS-CoV-2, an encapsulated positive-stranded RNA virus, spread worldwide with disastrous consequences for people's health, economies, and quality of life. The disease has had far-reaching impacts on society, including economic disruption, school closures, and increased stress and anxiety. It has also highlighted disparities in healthcare access and outcomes, with marginalized communities disproportionately affected by the SARS-CoV-2. The symptoms of COVID-19 range from mild to severe. There is presently no effective cure. Nevertheless, significant progress has been made in developing COVID-19 vaccine for different therapeutic targets. For instance, scientists developed multifold vaccine candidates shortly after the COVID-19 outbreak after Pfizer and AstraZeneca discovered the initial COVID-19 vaccines. These vaccines reduce disease spread, severity, and mortality. The addition of rapid diagnostics to microscopy for COVID-19 diagnosis has proven crucial. Our review provides a thorough overview of the historical development of COVID-19 and molecular and biochemical characterization of the SARS-CoV-2. We highlight the potential contributions from insect and plant sources as anti-SARS-CoV-2 and present directions for future research.

Mango anthracnose disease: the current situation and direction for future research.

Mango anthracnose disease (MAD) is a destructive disease of mangoes, with estimated yield losses of up to 100% in unmanaged plantations. Several strains that constitute Colletotrichum complexes are implicated in MAD worldwide. All mangoes grown for commercial purposes are susceptible, and a resistant cultivar for all strains is not presently available on the market. The infection can widely spread before being detected since the disease is invincible until after a protracted latent period. The detection of multiple strains of the pathogen in Mexico, Brazil, and China has prompted a significant increase in research on the disease. Synthetic pesticide application is the primary management technique used to manage the disease. However, newly observed declines in anthracnose susceptibility to many fungicides highlight the need for more environmentally friendly approaches. Recent progress in understanding the host range, molecular and phenotypic characterization, and susceptibility of the disease in several mango cultivars is discussed in this review. It provides updates on the mode of transmission, infection biology and contemporary management strategies. We suggest an integrated and ecologically sound approach to managing MAD.

Assessing the Comprehensive Training Needs of Informal Caregivers of Cancer Patients: A Qualitative Study.

INTRODUCTION: The increasing demand for cancer services is projected to overwhelm the cancer care system, leading to a potential shortfall in human resource capacity. Informal caregivers (unpaid family/friend caregivers of cancer patients) provide a significant amount of care to patients and the cancer care system could not cope without them. The aim of this study was to analyze the needs of informal caregivers (CGs) through interviews with cancer patients and CGs, and to assess the content and utility of a comprehensive caregiver training course. METHODS: Cancer patients and CGs were recruited from an academic cancer centre to elicit their thoughts and perceptions of cancer CG education needs through a qualitative, phenomenological design using semi-structured interviews and a curriculum review activity. RESULTS: Six patients and seven CGs were interviewed. Patients averaged 53.8 years of age and CGs averaged 53.1 years. Caregiver participants reported that they were unprepared for their caregiving role. Depending on the severity of the disease, CGs reported significant emotional strain. Most participants wanted more practical information, and all expressed the desire for greater social support for CGs. While there were differences in terms of desired modality (e.g., online, in-person), support for greater CG education was strong. DISCUSSION: CGs experience a significant learning curve and receive little to no direct training or education to help them acquire the knowledge and skills they need to support a cancer patient. This is especially challenging for new CGs, for whom emotional and informational needs are particularly acute. Participants shared a great deal of endorsement for a comprehensive training course for new CGs. Given the multiple demands on their time, some participants suggested that consideration be made to establish synchronous classes. Participants held that having the course take place (online or in-person) at a specific time, on a specific date could help CGs prioritize their learning. Participants also endorsed the idea of "required" learning because even though CGs may recognize that a course could be beneficial, some may lack the motivation to participate unless it was "prescribed" to them by a healthcare provider.

Using a Nominal Group Technique to Develop a Science Communication Curriculum for Health Professionals and Clinical Researchers.

Effective science communication is fundamental to closing the gap from research and innovation to clinical implementation. Existing paradigms of science communication are often challenged by a lack of skill and engagement, particularly from those who progress the science. Currently, a standardized curriculum on science communication, with global applicability, does not exist. The purpose of this project is to address the gap in training by health professionals and clinical researchers through the development of a globally relevant curriculum for science communication. The nominal group technique (NGT) was used whereby a convenience sample of eleven science communication experts from across the globe generated, discussed, and arrived at a consensus on topics that should be included in a standardized science communication curriculum. Experts represented diverse backgrounds within the health sciences. Due to the COVID-19 pandemic and geographical constraints, the NGT was conducted virtually. The consensus-building methodology allowed for each expert to equally present ideas and collaborate with one another to create a robust and comprehensive curriculum for effective science communication. Expert panelists reached a consensus on 10 essential components of a standardized global science communication curriculum. Following the refinement of the curriculum topic areas, a virtual meeting with project co-investigators was held to review the topics and discuss relevance, applicability, and appeal to the local contexts. A standardized science communication curriculum is needed for health professionals and clinical researchers. The NGT achieved expert consensus on the core topics. The next steps are to develop the course ensuring optimal participation from learners across the globe.

Exploring the Perceived Educational Impact of COVID-19 on Postgraduate Training in Oncology.

This study sought to report the degree to which postgraduate trainees in radiation oncology perceive their education has been impacted by the COVID-19 pandemic. A cross-sectional online survey was administered from June to July 2020 to trainee members of the Canadian Association of Radiation Oncology (CARO) (n = 203). Thirty-four trainees responded with a 17% response rate. Just under half of participants indicated that COVID-19 had a negative/very negative impact on training (n = 15; 46%). The majority agreed/strongly agreed that they feared family/loved ones would contract COVID-19 (n = 29, 88%), felt socially isolated from friends and family because of COVID-19 (n = 23, 70%), and had difficulty concentrating on tasks because of concerns about COVID-19 (n = 17, 52%). Changes that had a negative/very negative impact on learning included limitations to travel and networking (n = 31; 91%) and limited patient contact (n = 19; 58%). Virtual follow-ups (n = 25: 76%) and in-patient care activities (n = 12; 36%) increased. Electives were cancelled in province (n = 10; 30%), out-of-province (n = 16; 49%), and internationally (n = 15; 46%). Teaching from staff was moderately reduced to completely suppressed (n = 23, 70%) and teaching to medical students was moderately reduced to completely suppressed (n = 27, 82%). Significant changes to radiation oncology training were wrought by the pandemic, and roughly half of trainees perceive that these changes had a negative impact on training. Innovations in training delivery are needed to adapt to these new changes.

Exploring Brachytherapy Discharge Educational Needs of Gynecological Cancer Patients.

Brachytherapy (BT) plays a fundamental role in the treatment of gynecological cancers. Patient education for vaginal self-management and dilator use post-BT involves an interdisciplinary team of healthcare professionals (HCPs) and there is a paucity of post-BT education guidelines. Our objective was to determine the educational needs of gynecological cancer patients surrounding vaginal self-management post-BT and to determine enablers and barriers to the provision of education by HCPs. This cross-sectional study recruited gynecological oncology patients receiving external beam radiotherapy and BT for curative intent. Patients completed a questionnaire to assess their vaginal self-management educational needs, preferred education modality, and desired timing of post-BT education. HCPs were invited to complete a questionnaire to identify enablers and barriers to providing BT education. Twenty patients and 53 HCPs participated. All patients rated each topic as very important/important with information about preventing vaginal stenosis as the most important overall (89%). When asked about topics they addressed during BT education, most HCPs reported that "explaining what vaginal stenosis is and the negative effects of stenosis" was always discussed with patients (N = 37/49, 77%). Barriers to providing post-BT education, including the patients' language and culture, as well as enablers, such as the use of written resources and tools for patients, were identified. Despite a high level of engagement, current education surrounding vaginal self-management post-BT may be inadequate.

The Impact of Parent and Family Caregiver Roles Among Canadian Radiation Oncologists.

PURPOSE: Working parents, and a rising number of adults delivering care for aging relatives, experience numerous challenges in their personal, family, professional, and financial lives owing to multiple responsibilities. This study describes the experiences of Canadian radiation oncologist (RO) parents and family caregivers, reporting challenges that may exist in providing family care with clinical and academic work commitments. METHODS AND MATERIALS: Canadian ROs, via RO heads of departments in cancer centers across Canada, and physician members of the Canadian Association of Radiation Oncology were invited to participate in an anonymous online survey between November 2021 and January 2022. The survey focused on demographics, experiences of pregnancy and leave, parenting and adult caregiving responsibilities, and self-care. RESULTS: A total of 103 staff ROs (38%) completed the survey and 78 (75.7%) identified as having a parental (76 [89.7%]) and/or other family caregiver (8 [10.3%]) role; 41% were female and 59% were male, with no difference between genders in the number of children (median, 2; interquartile range, 1-3; P = .17). More female respondents took parental leave for their first child compared with male respondents (mean, 29 vs 6 weeks; P < .001). Of male respondents who started caring for their first child during residency, 27% took parental leave, compared with 77% who started caring for their first child as a staff member (P = .003). The majority of respondents described "always/usually" having collegial support for each pregnancy and parental leave. Both genders described parental responsibilities as negatively affecting attendance at conferences (male, 65%; female, 77%; P = .31) and early or late work-related meetings (male, 76%; female, 79%; P = 1.0). More female respondents described parental responsibilities as negatively affecting their career (50% vs 29%; P = .085). Of female respondents, 52% (vs 26% of male respondents; P = .044) identified a physician mentor or positive role model around parenting issues. CONCLUSIONS: Parental and other family caregiving responsibilities are not gender unique in Canadian ROs, but competing work and family roles may affect genders differently.

Predictors of prostate cancer survivors' engagement in self-management behaviors.

INTRODUCTION: Prostate cancer survivors experience a multitude of late treatment effects, resulting in greater unmet needs, elevated symptom burden, and reduced quality of life. Survivors can engage in appropriate self-management strategies post-treatment to help reduce the symptom burden. The objectives of this study were to: 1) survey the unmet needs of prostate cancer survivors using the validated Cancer Survivor Unmet Needs instrument; 2) explore predictors of high unmet needs; and 3) investigate prostate cancer survivors' willingness to engage in self-management behaviors. METHODS: Survivors were recruited from a prostate clinic and a cross-sectional survey design was employed. Inclusion criteria was having completed treatment two years prior. Descriptive statistics were used to summarize participant characteristics. Univariate and multivariate analyses were done to determine predictors of unmet needs and readiness to engage. RESULTS: A total of 206 survivors participated in the study, with a mean age of 71 years. Most participants were university/college-educated (n=123, 61%) and had an annual household income of ≥$99 999 (n=74, 38%). Participants reported erectile dysfunction (81%) and nocturia (81%) as the most frequently experienced symptoms with the greatest symptom severity χ̄=5.8 and χ̄=4.5, respectively). More accessible parking was the greatest unmet need in the quality-of-life domain (n=34/57, 60%). Overall, supportive care unmet needs were predicted by symptom severity on both univariate (p<0.001) and multivariate analyses (odds ratio [OR ] 1.81, 95% confidence interval [CI] 0.92-1.00, p<0.001). Readiness to engage in self-management was predicted by an income of <$49 000 (OR 3.99, 95% CI 1.71-9.35, p=0.0014). CONCLUSIONS: Income was the most significant predictor of readiness to engage in self-management. Consideration should be made to establishing no-cost and no-barrier education programs to educate survivors about how to engage in symptom self-management.

Improving Access to Patient Education: an Audit of Extant Educational Materials.

Health information exchange between provider and patient, along with patient participation in their care (self-management), can lead to improved health outcomes. A step towards achieving better outcomes is the systematic provision of education materials to patients and caregivers throughout the cancer trajectory. An audit of patient education (PE) materials was conducted at a cancer center to identify content gaps and determine areas for future development. The PE audit was conducted in all outpatient clinics (13) and clinic-specific PE materials were identified, reviewed, and categorized by cancer type and under the following topics: About Cancer/Disease, Medical Tests and Imaging, Treatment, Symptom Management, Rehabilitation/Survivorship, General Wellbeing, Medical Device Care, Practical and Other. Four hundred forty-seven PE materials were included in the audit. Totals for each topic were summed and analyzed for education development opportunities. Results varied based on clinic and cancer type. Majority of the materials were found in the following clinics: Hematology (75), Genitourinary (74), and Gastrointestinal (57). The most common information topics were treatment (277), about cancer/disease (134), and symptom management (120). When broken down by cancer type, it was clear that while the collection of PE materials is well established for some diagnoses (e.g., 28 prostate cancer materials), there is a significant dearth in materials for others (e.g., 0 penile cancer materials). Audit results will be used to identify opportunities for future education material development. Determining cancer-specific information gaps is important in achieving equal information access for patients and caregivers, regardless of cancer diagnosis.

COVID-19 and Cancer Patients in the Second Year of the Pandemic: Investigating Treatment Impact, Information Sources, and COVID-19-Related Knowledge, Attitudes and Practices.

BACKGROUND: The novel coronavirus that has triggered the present COVID-19 pandemic continues to spread globally, resulting in widespread morbidity and mortality. Patients with cancer remain one of the most vulnerable subsets of the population to the disease. This study examined the effects of the pandemic on cancer patients' treatment, psychology, knowledge, attitudes, and practices. METHODS: A survey was emailed to 9861 patients at a cancer centre in Toronto, Canada. Descriptive results were summarized. Qualitative feedback was coded and summarized. Regression modelling was used to explore factors associated with patient psychological well-being, knowledge, attitudes, and practices. RESULTS: A total of 1760 surveys were completed, with a response rate of 17.8%. Most participants did not experience any pandemic-related treatment delays, and vaccination rates were high. Participants who identified themselves as non-white (OR 3.30, CI: 1.30-5.30; p ≤ 0.001), and those who referred to journal articles for information (p = 0.002) reported higher psychological impact scores. There were no significant predictors of whether participants would use personal protective equipment when leaving their homes or whether they would go to crowded places. DISCUSSION: This study provides another snapshot of cancer patients perceptions and needs during the COVID-19 pandemic.

Prostate cancer survivor capacity to engage in survivorship self-management: a comparison of perceptions between oncology specialists, primary care, and survivors.

PURPOSE: The rapidly increasing number of prostate cancer survivors in tandem with a forthcoming shortage of oncology specialists in our health system poses a barrier to ensuring that high-quality survivorship care is available to support this population. As such, there is a need to consider ways to optimize survivorship care, while taking health system constraints into account. The purpose of this study is to explore the perceptions of survivorship self-management between oncology specialists, primary care providers (PCPs), and survivors themselves. METHODS: A single cross-sectional survey, relating to how prostate cancer survivorship care could be improved, was administered to each group. RESULTS: Two hundred forty-three participants (N = 206 survivors, N = 10 oncology specialists, N = 27 PCPs) completed the study survey. Most PCPs (90%) and oncology specialists (84%) perceived that an opportunity for prostate cancer survivors to have an expanded role in their care would be beneficial. Nearly half (49%) of survivors reported that it would be beneficial to have an expanded role in their survivorship care with only 11% indicating that it would not be beneficial at all. CONCLUSIONS: Barriers to developing this model involve limited oncology specialist time to execute survivorship plans, limited communication between oncology specialists and PCPs, and a lack of primary care and survivor education targeted specifically to prostate cancer survivorship.

Feedback Delivery in an Academic Cancer Centre: Reflections From an R2C2-based Microlearning Course.

Feedback delivery and training have not been characterized in the context of academic cancer centres. The purpose of this study was to assess the feasibility and utility of a microlearning course based on the R2C2 (Relationship, Reaction, Content, Coaching) feedback model and characterize multidisciplinary healthcare provider (HCP) perspectives on existing feedback practices in an academic cancer centre. Five HCP (two radiation oncologists, one medical oncologist, and two allied health professionals) with supervisory roles were selected by purposive sampling to participate in a prospective longitudinal qualitative study. Each participant completed a web-based multimedia course. Semi-structured one-on-one interviews were conducted with each participant at four time points: pre- and immediately post-course, and at one- and three-months post course. All participants found the course to be time feasible and completed it in 10-20 min. Participants expressed that the course fulfilled their need for feedback training and that its adoption may normalize a feedback culture in the cancer centre. Three themes were identified regarding perceptions of existing feedback practices: (1) hierarchical and interdisciplinary relationships modulate feedback delivery, (2) interest in feedback delivery varies by duration of the supervisory relationship, and (3) the transactionality of supervisor-trainee relationships influences feedback delivery. This study demonstrates the perceived feasibility and utility of a digital microlearning approach for development of feedback competencies in an academic cancer centre, perceptions of cultural barriers to feedback delivery, and the need for organizational commitment to developing a feedback culture.

COVID-19 and patients with cancer: Investigating treatment impact, information sources, and COVID-19-related knowledge, attitudes, and practices.

BACKGROUND: The coronavirus disease 2019 (COVID-19) pandemic has caused enormous strain on public health. Patients with cancer are particularly susceptible to the disease, and their treatment plans have been threatened by public health restrictions designed to contain the spread. METHODS: This study examined the effects of the pandemic on cancer patients' psychology, knowledge, attitudes, and practices concerning COVID-19 as well as their perceptions of the impact of COVID-19 on their cancer health care services. A survey was sent to 5800 patients at a cancer center in Toronto, Canada. Descriptive results were summarized. Qualitative feedback was coded and summarized. To examine for potential associations, regression models were tested for the outcomes of patient psychological well-being, knowledge, attitudes, and practices, and they accounted for several demographic, health literacy, and disease variables. RESULTS: A total of 1631 surveys were completed. Most patients saw their appointments shifted to virtual visits, and for a substantial minority, there was no change. A majority of the patients (62%) expressed fears about contracting the virus. There were no independent predictors of COVID-19-related knowledge. Fears were more pronounced among patients who did not speak English and those who used social media more often. Female participants, those who scored higher on knowledge questions, and those who used cancer center materials were more likely to take preventative measures against infection. CONCLUSIONS: This study provides a snapshot of the state of cancer patient treatment and the knowledge, attitudes, and practices of patients between the first 2 waves of the pandemic. The study's results can inform our understanding of adaptation to conditions during and after the outbreak.

Pivoting the Provision of Smoking Cessation Education in a Virtual Clinical World: The Princess Margaret Cancer Centre Experience.

Continued smoking after a cancer diagnosis may be attributed to misbeliefs by both patients and healthcare providers on the value and benefit of quitting smoking on treatment outcomes. The perceived myths and misconceptions about the relationship between smoking and cancer may be readily dispelled with the provision of practical and pertinent education. However, busy clinics as well as the rapid move to virtual care due to the COVID-19 pandemic present several challenges with the provision of smoking cessation education. Here, we describe how the Princess Margaret Cancer Centre implemented innovative solutions to improve the delivery of education during the COVID-19 pandemic to better support patients and healthcare providers.

Exploration of Barriers and Facilitators to Optimal Emergency Department Care of Sickle Cell Disease: Opportunities for Patient-Physician Partnerships to Improve Care.

Sickle cell disease patients commonly present to an emergency department (ED) due to acute vaso-occlusive pain episodes (VOEs), also known as vaso-occlusive crises (VOCs). Unsatisfactory patient care leads to preventable morbidity, mortality, and substantial financial costs. This study investigated the current use of sickle cell disease patient-directed physician education (PDPE) in the clinical setting and also explored opportunities for improvement. A qualitative phenomenologic design was used with semi-structured in-depth interviews. Open-ended questions were used to probe participant's experiences with EDs, the feasibility of a PDPE program as well as barriers and facilitators to PDPE. A total of nine patients and eight physicians participated in the study. Three major themes were identified: divergent challenges to patient recommendations, new targets for sickle cell disease education and triage process: not heard and not seen. Numerous challenges exist to the implementation and optimization of PDPE with sickle cell disease triage processes and nursing support identified as influential factors. Paramount to the process of improving PDPE is physicians perceiving patients as credible sources of information, especially as it relates to generalized concerns of opioid dosing. A patient provided written or digital education tool can be considered to facilitate PDPE to ease communication strain on patients while increasing communication efficiency.

Evaluating the effect of a group pre-treatment chemotherapy psycho-education session for chemotherapy-naive gynecologic cancer patients and their caregivers.

OBJECTIVE: The objective was to evaluate the effects of a pre-chemotherapy education class on chemotherapy-naïve patients diagnosed with gynecologic cancer and their informal caregivers. METHODS: A prospective cohort study was conducted at a cancer centre in Toronto, Canada. All women diagnosed with gynecologic cancer, who were scheduled to receive chemotherapy treatment, and their caregivers were invited to attend the GyneChemo class, newly introduced as the centre's standard of care. Consenting attendees were asked to complete pre-and post-class survey measures assessing anxiety, self-efficacy, information needs, preparedness to begin chemotherapy treatment, and satisfaction with the class. RESULTS: Between September 2014 to September 2016, 642 individuals attended the GyneChemo class. 75 patients and 64 caregivers completed both pre- and post-class measures. Over 80% of participants agreed that the class was beneficial, specific to their needs, and administered in an appropriate setting. Significant increases in patient and caregiver self-efficacy (p < 0.001) and preparedness to begin chemotherapy treatment (p < 0.001) were found following class completion. Significant differences in patient's anxiety scores were found, with patients who reported an annual household income of <$25,000 experiencing increased anxiety (MD = +5.33) and patients reporting an income of $25,000-$75,000 reporting decreased anxiety (MD = -4.75) following class completion (p = 0.034). No significant difference in the average pre-post caregiver anxiety score (p = 0.207) was found. CONCLUSION: This educational model provides patients and informal caregivers with information specific to their chemotherapy regimen and disease site. Integrating pre-treatment education into cancer care has the potential to improve the survivorship experience by increasing self-efficacy, treatment preparedness, and psychological well-being.

Dynamical signatures from competing, nonadiabatic fragmentation pathways of S-nitrosothiophenol.

S-Nitrosothiols (RSNOs) are derived from the combination of sulfur and nitric oxide (NO) radicals in the Earth's atmosphere and fragment to products following photolysis. Extensive theoretical studies have focused on the thermodynamic and, to a lesser extent, photochemical properties of RSNOs. However, experimental studies of these compounds have been limited due to the inherent instability of RSNOs at room temperature. Using velocity map imaging (VMI), we explore the photodissociation dynamics of jet-cooled S-nitrosothiophenol (PhSNO) from 355 nm photolysis. We report the translational and internal energy distributions of the NO and thiophenoxy (PhS) co-fragments, which are determined by spatial detection of the ionized NO photofragments using 1+1 resonance-enhanced multiphoton ionization (REMPI). The velocity distributions indicate competing PhSNO nonadiabatic dissociation pathways, in which PhS is formed in the ground and first excited electronic states when probing high- and low-energy NO (X2Π1/2, v'', J'') rovibrational states, respectively. The results of multireference electronic structure calculations suggest that direct dissociation on the bright S2 state results in PhS formed in its excited electronic state, whereas intersystem crossing into the triplet manifold leads to population of PhS in its electronic ground state. The dynamical signatures from the dissociation processes are imprinted on the fragments' quantum states and relative translation, which we explore in rigorous detail using state-resolved imaging and high-level theoretical calculations.

A large self-transmissible resistance plasmid from Nigeria contains genes that ameliorate a carrying cost.

Antimicrobial resistance is rapidly expanding, in a large part due to mobile genetic elements. We screened 94 fecal fluoroquinolone-resistant Escherichia coli isolates from Nigeria for six plasmid-mediated quinolone resistance (PMQR) genes. Sixteen isolates harbored at least one of the PMQR genes and four were positive for aac-6-Ib-cr. In one strain, aac-6-Ib-cr was mapped to a 125 Kb self-transmissible IncFII plasmid, pMB2, which also bears blaCTX-M-15, seven other functional resistance genes and multiple resistance pseudogenes. Laboratory strains carrying pMB2 grew faster than isogenic strains lacking the plasmid in both rich and minimal media. We excised a 32 Kb fragment containing transporter genes and several open-reading frames of unknown function. The resulting 93 Kb mini-plasmid conferred slower growth rates and lower fitness than wildtype pMB2. Trans-complementing the deletion with the cloned sitABCD genes confirmed that they accounted for the growth advantage conferred by pMB2 in iron-depleted media. pMB2 is a large plasmid with a flexible resistance region that contains loci that can account for evolutionary success in the absence of antimicrobials. Ancillary functions conferred by resistance plasmids can mediate their retention and transmissibility, worsening the trajectory for antimicrobial resistance and potentially circumventing efforts to contain resistance through restricted use.

Imaging the nonreactive collisional quenching dynamics of NO (A2Σ+) radicals with O2 (X3Σg -).

Nitric oxide (NO) radicals are ubiquitous chemical intermediates present in the atmosphere and in combustion processes, where laser-induced fluorescence is extensively used on the NO (A2Σ+ ← X2Π) band to report on fuel-burning properties. However, accurate fluorescence quantum yields and NO concentration measurements are impeded by electronic quenching of NO (A2Σ+) to NO (X2Π) with colliding atomic and molecular species. To improve predictive combustion models and develop a molecular-level understanding of NO (A2Σ+) quenching, we report the velocity map ion images and product state distributions of NO (X2Π, v″ = 0, J″, Fn, Λ) following nonreactive collisional quenching of NO (A2Σ+) with molecular oxygen, O2 (X3Σg -). A novel dual-flow pulse valve nozzle is constructed and implemented to carry out the NO (A2Σ+) electronic quenching studies and to limit NO2 formation. The isotropic ion images reveal that the NO-O2 system evolves through a long-lived NO3 collision complex prior to formation of products. Furthermore, the corresponding total kinetic energy release distributions support that O2 collision coproducts are formed primarily in the c1Σu - electronic state with NO (X2Π, v″ = 0, J″, Fn, Λ). The product state distributions also indicate that NO (X2Π) is generated with a propensity to occupy the Π(A″) Λ-doublet state, which is consistent with the NO π* orbital aligned perpendicular to nuclear rotation. The deviations between experimental results and statistical phase space theory simulations illustrate the key role that the conical intersection plays in the quenching dynamics to funnel population to product rovibronic levels.

Informational needs of brain metastases patients and their caregivers.

BACKGROUND: In response to a dearth of formal health information targeted towards patients with brain metastases and their caregivers, a formal informational and supportive care needs assessment was conducted. METHODS: Brain metastases patients and caregivers who attended a clinic focused on the treatment of brain metastases at a tertiary medical center completed a self-report survey to assess informational needs across 6 domains: medical, physical, practical, social, emotional, and spiritual informational needs. Univariate and multivariate analyses of associations between variables was conducted using linear regression models. RESULTS: A total of 109 patients and 77 caregivers participated. Patients and caregivers both prioritized medical and physical informational domains, with a large focus on symptoms and side-effect profiles, significance of brain metastases locations and their implications, available treatment options and their risks and benefits, prognoses and follow-ups if treatment is completed, and end-of-life experiences and supports. One-on-one counseling was preferred by both caregivers and patients for these domains, as well as for practical informational needs; while patients preferred pamphlets to address social, emotional and spiritual informational needs, caregivers preferred one-on-one counseling for the former two domains as well. CONCLUSIONS: Brain metastases patients and their caregivers prioritize medical and physical informational needs, with one-on-one counseling and pamphlets being the most preferred modalities for information provision. Further exploration regarding existing non-validated resources and the development of tailored resources to address the unique needs of these patient and caregiver populations are warranted.