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1.
iScience ; 27(3): 109036, 2024 Mar 15.
Article in English | MEDLINE | ID: mdl-38361612

ABSTRACT

Among the most important impacts of biological invasions on biodiversity is biotic homogenization, which may further compromise key ecosystem processes. However, the extent to which they homogenize functional diversity and shift dominant ecological strategies of invaded communities remains uncertain. Here, we investigated changes in plant communities in a northern North American forest in response to invasive earthworms, by examining the taxonomic and functional diversity of the plant community and soil ecosystem functions. We found that although plant taxonomic diversity did not change in response to invasive earthworms, they modified the dominance structure of plant functional groups. Invasive earthworms promoted the dominance of fast-growing plants at the expense of slow-growing ones. Moreover, earthworms decreased plant functional diversity, which coincided with changes in abiotic and biotic soil properties. Our study reveals that invasive earthworms erode multiple biodiversity facets of invaded forests, with potential cascading effects on ecosystem functioning.

2.
Inflamm Bowel Dis ; 29(11): 1681-1692, 2023 11 02.
Article in English | MEDLINE | ID: mdl-37300505

ABSTRACT

BACKGROUND: The Ulcerative Colitis (UC) Narrative global survey assessed aspects of living with UC. This analysis aimed to identify health care disparities, social determinants of health, and emotional impacts related to UC disease management, patient experience, and quality of life. METHODS: The survey was conducted by The Harris Poll from August 2017 to February 2018 among adults with UC. Responses from 1000 patients in the United States, Canada, Japan, France, and Finland were analyzed based on patient income, employment status, educational level, age, sex, and psychological comorbidities. Odds ratios (ORs) with significant P values (P < .05) from multivariate logistic regression models are reported. RESULTS: Low-income vs high-income patients were less likely to have participated in a peer mentoring (OR, 0.30) or UC education program (OR, 0.51). Patients not employed were less likely to report being in "good/excellent" health (OR, 0.58) than patients employed full time. Patients with low vs high educational levels were less likely to have reached out to patient associations/organizations (OR, 0.59). Patients aged younger than 50 years vs those aged 50 years and older were less likely to have visited an office within an inflammatory bowel disease center/clinic in the past 12 months (OR, 0.53). Males were less likely to be currently seeing their gastroenterologist than females (OR, 0.66). Patients with vs without depression were less likely to agree that UC had made them more resilient (OR, 0.51). CONCLUSIONS: Substantial differences in disease management and health care experience were identified, based on categories pertaining to patient demographics and psychological comorbidities, which may help health care providers better understand and advance health equity to improve patient care.


Patient-reported survey results revealed substantial differences in disease management and health care experience in patients with ulcerative colitis, based on categories pertaining to patient demographics and diagnosed psychological comorbidities, including income level, employment status, educational level, age, sex, depression, and anxiety.


Subject(s)
Colitis, Ulcerative , Adult , Male , Female , Humans , United States , Middle Aged , Aged , Colitis, Ulcerative/psychology , Quality of Life/psychology , Healthcare Disparities , Social Determinants of Health , Emotions
3.
Surg Technol Int ; 412022 10 20.
Article in English | MEDLINE | ID: mdl-36265122

ABSTRACT

The COVID-19 pandemic, which started in March of 2020, and its associated surges have had an immense impact on the ability of medical staff to perform their daily activities. Thus, we sought to direct patients who had gram-positive Acute Bacterial Skin and Skin Structure Infections (ABSSSI) to our Outpatient Department/Wound Care Center for treatment. We met the challenge of the pandemic by shifting care in the treatment of ABSSSI using a new antibiotic delivery system. We examined the use and cost-effectiveness of Dalbavancin, a unique long-acting lipoglycopeptide antibiotic that is used in the treatment of acute bacterial skin and skin structure infections, during the COVID-19 pandemic. A total of 631 patients were treated in the Outpatient Department/Wound Care Center, with re-evaluation at the Wound Care Center on Day 3 post-infusion. The primary test of cure or major improvement was based on a 4- to 6-week re-assessment by the Wound Care Center Faculty (i.e., Podiatric, Vascular, Plastics, and Infectious Diseases). Treatment effectiveness was determined by examining documentation at follow-up. We also looked at the number of Outpatient Department treatments at the Wound Care Center for the periods 2018-2019 and 2020-2021. The shift of patients from the Emergency Department/Inpatient Department to the Outpatient Department/Wound Care Center was made possible by the use of the novel, streamlined, safe, Food and Drug Administration (FDA)-approved, well-tolerated antibiotic Dalbavancin. Dalbavancin is not prescribed for gram-negative infections, or for random prescribing, contamination, colonization, or prophylaxis. Dalbavancin has a low infusion reaction, low toxicity, long half-life, and low incidence of adverse reactions. Use of this medication was helpful for decreasing the inpatient burden in our facility.

4.
Addict Behav Rep ; 16: 100437, 2022 Dec.
Article in English | MEDLINE | ID: mdl-35694108

ABSTRACT

Given prevalent alcohol misuse-emotional comorbidities among young adults, we developed an internet-based integrated treatment called Take Care of Me. Although the treatment had an impact on several secondary outcomes, effects were not observed for the primary outcome. Therefore, the goal of the current study was to examine heterogeneity in treatment responses. The initial RCT randomized participants to either a treatment or psychoeducational control condition. We conducted an exploratory latent class analysis to distinguish individuals based on pre-treatment risk and then used moderated regressions to examine differential treatment responses based on class membership. We found evidence for three distinct groups. Most participants fell in the "low severity" group (n = 123), followed by the "moderate severity" group (n = 57) who had a higher likelihood of endorsing a previous mental health diagnosis and treatment and higher symptom severity than the low group. The "high severity" group (n = 42) endorsed a family history of alcoholism, and the highest symptom severity and executive dysfunction. Moderated regressions revealed significant class differences in treatment responses. In the treatment condition, high severity (relative to low) participants reported higher alcohol consumption and hazardous drinking and lower quality of life at follow-up, whereas moderate severity (relative to low) individuals had lower alcohol consumption at follow-up, and lower hazardous drinking at end-of-treatment. No class differences were found for participants in the control group. Higher risk individuals in the treatment condition had poorer responses to the program. Tailoring interventions to severity may be important to examine in future research.

5.
Indian J Anaesth ; 66(1): 70-76, 2022 Jan.
Article in English | MEDLINE | ID: mdl-35309025

ABSTRACT

The quality of training is a major contributor to workforce proficiency in healthcare, and there is a definite need to achieve a uniform level of knowledge and skill in medical education programmes. There is a paucity of literature comparing postgraduate anaesthesia medical education training structure and requirements across the globe. In a zeal to achieve uniform competencies and technical skills, the strengths and scope of training programmes need to be identified. In this article, we describe the core elements of postgraduate training in various countries while proposing an amalgamation of strengths of each programme and providing a roadmap to evolve further the competency-based comprehensive curriculum proposed by the National Medical Commission of India.

6.
Biol Lett ; 18(3): 20210636, 2022 03.
Article in English | MEDLINE | ID: mdl-35350876

ABSTRACT

Declining arthropod communities have recently gained a lot of attention, with climate and land-use change among the most frequently discussed drivers. Here, we focus on a seemingly underrepresented driver of arthropod community decline: biological invasions. For approximately 12 000 years, earthworms have been absent from wide parts of northern North America, but they have been re-introduced with dramatic consequences. Most studies investigating earthworm-invasion impacts focus on the belowground world, resulting in limited knowledge on aboveground-community changes. We present observational data on earthworm, plant and aboveground arthropod communities in 60 plots, distributed across areas with increasing invasion status (low, medium and high) in a Canadian forest. We analysed how earthworm-invasion status and biomass impact aboveground arthropod community abundance, biomass and species richness, and how earthworm impacts cascade across trophic levels. We sampled approximately 13 000 arthropods, dominated by Hemiptera, Diptera, Araneae, Thysanoptera and Hymenoptera. Total arthropod abundance, biomass and species richness declined significantly from areas of low to those with high invasion status, with reductions of 61, 27 and 18%, respectively. Structural equation models suggest that earthworms directly and indirectly impact arthropods across trophic levels. We show that earthworm invasion can alter aboveground multi-trophic arthropod communities and suggest that belowground invasions might be underappreciated drivers of aboveground arthropod decline.


Subject(s)
Arthropods , Oligochaeta , Animals , Canada , Forests , Plants
7.
Subst Use Misuse ; 57(1): 96-104, 2022.
Article in English | MEDLINE | ID: mdl-34753393

ABSTRACT

Background: Emerging adulthood is associated with heavy drinking. Despite overall heavy use, studies show considerable heterogeneity in emerging adult drinking habits. Lau-Barraco and colleagues (2016 b) identified three subtypes (high, moderate, low) of emerging adult heavy drinkers based on patterns of use across common drinking situations. Heavy situational drinkers had more alcohol problems, mental health symptoms, and coping/conformity motives for alcohol use.Objective: Our goal was to replicate and extend the aforementioned study, expecting to find the same subgroups, then examining whether certain risk factors predicted subgroup membership.Methods/Results: Undergraduates (N = 497) completed online self-report measures and a latent profile analysis (LPA) found support for three similar subtypes; low, "moderate" (higher endorsement of pleasant emotion/social pressure situations, relative to the low group), and high. Univariate ANOVAs, followed by pairwise comparisons, found that heavy situational drinkers scored highest on measures of alcohol problems, problem gambling, drug use, depression, and anxiety compared to the other two groups, and consistent with previous findings.Conclusions: This study showed that emerging adults who drink heavily across various situations are likely to engage in other addictive behaviors and struggle with mental health symptoms. Identifying one's personal risk factors and their riskiest drinking situations is critical for developing targeted intervention programs and increasing the understanding of the heterogeneous nature of drinking behaviors in emerging adults in Canada.


Subject(s)
Alcohol Drinking , Alcohol-Related Disorders , Adaptation, Psychological , Adult , Alcohol Drinking/psychology , Humans , Motivation , Social Behavior , Students/psychology
8.
Addict Behav Rep ; 14: 100390, 2021 Dec.
Article in English | MEDLINE | ID: mdl-34938848

ABSTRACT

Many young adults struggle with comorbid alcohol misuse and emotional problems (i.e., depression and anxiety). However, there is currently a paucity of evidence-based, integrated, accessible treatment options for individuals with these comorbidities. The main goal of this study was to examine efficacy of a novel online, minimally guided, integrated program for comorbid alcohol misuse and emotional problems in young adults. Method: The study was an open-label two-arm RCT. Participants (N = 222, M age = 24.6, 67.6% female) were randomized to one of two conditions: the Take Care of Me program (an 8-week, online integrated treatment condition consisting of 12 modules), or an online psychoeducational control condition. Intervention modules incorporated content based on principles of cognitive behavioral therapy and motivational interviewing. Participants completed assessment data at baseline, at the end of treatment (i.e., 8 weeks), and at follow-up (i.e., 24 weeks). Data were analyzed using generalized linear mixed models. Results: We observed that participants in the treatment condition showed larger reductions in depression, hazardous drinking, as well as increases in psychological quality of life and confidence at the end of treatment. We did not find group differences on total alcohol use at follow-up, but participants in the treatment group reduced their hazardous drinking and improved their quality of life at 24-week follow-up. Conclusions: Our study provides promising initial evidence for the first iteration of the comorbid alcohol misuse and emotional problems online program.

9.
Pediatr Qual Saf ; 6(5): e473, 2021.
Article in English | MEDLINE | ID: mdl-34589647

ABSTRACT

Improving the discharge process is an area of focus throughout healthcare organizations. Capacity constraints, efficiency improvement, patient safety, and quality care are driving forces for many discharge process workgroups. METHODS: Following the Pareto principle, we focused on improving the discharge process on the medical-surgical units that received the most patients admitted from the emergency department. Increased demand for medical-surgical beds, renovations, and diminished bed capacity made it imperative to improve efficiency using quality improvement techniques. A core team of frontline staff decreased the time between computer entry of discharge orders and patient's departure from the unit to less than 60 minutes, with 80% compliance. The team developed a daily dashboard that detailed the process and outcome measures to create situational awareness and daily visual management. Additional observations of staff workflow uncovered excessive walking for printer use. Printers were placed at the point of use to reduce transport times. Next, using survey results provided by patients on discharge quality, a Treasure Map that aided with teach-back and Team Discharge were implemented to level the staff's workload. Finally, physicians discharged patients earlier in the day. They standardized their discharge criteria to remove subjectivity from the discharge process and enable better team involvement. RESULTS: After implementing 4 interventions, the average time between computer entry of discharge orders and patient's departure from the unit decreased (94.26 versus 65.98 minutes; P < 0.001), simultaneously reducing our average length of stay from 5.62 to 4.81 days (P < 0.001). CONCLUSIONS: In conclusion, hardwiring proven interventions and complementing them with daily visual management led to significant, sustained results.

10.
Subst Use Misuse ; 56(11): 1715-1725, 2021.
Article in English | MEDLINE | ID: mdl-34253147

ABSTRACT

INTRODUCTION: Depression and problem drinking are comorbid in emerging adulthood, yet the processes that link them are not well understood. Research has argued that shame has a unique influence on the experience of problematic drinking, but this has rarely been assessed at the state level. Using ecological momentary assessments (EMAs), we assessed whether shame, and not guilt, mediated the association between baseline depression and alcohol use and problems. METHODS: One hundred and eighty-four emerging adults (Mage= 19.27) completed a 12-day EMA study. Multilevel models were used to test hypotheses. RESULTS: In a model with alcohol use as the outcome, there were no significant associations between shame or guilt and alcohol use at the within- or between-subjects level. In a model with alcohol problems as the outcome, guilt was positively associated with alcohol problems but only at the daily level. At the between-subjects level and after controlling for guilt, there was a significant association between depression, shame, and alcohol problems; average levels of shame mediated the association between depression and alcohol problems. In post-hoc reverse directionality models, average alcohol problems mediated the relationship between depression and shame and guilt at the between-person level. No mediation was present for alcohol use. CONCLUSION: After controlling for guilt, shame is an emotion that helps explain risk for alcohol problems among depressed emerging adults, which has implications for targeted interventions. Reciprocal associations between shame, guilt, and alcohol problems emerged highlighting the need for more fulsome assessments of shame and guilt in future EMA research.


Subject(s)
Alcoholism , Depression , Adult , Depression/epidemiology , Emotions , Guilt , Humans , Shame , Young Adult
13.
J Med Case Rep ; 15(1): 152, 2021 Apr 07.
Article in English | MEDLINE | ID: mdl-33823908

ABSTRACT

BACKGROUND: Raoultella Planticola is a facultative anaerobic, gram-negative, water- and soil-dwelling rod bacterium rarely reported as a cause of human disease. However, the number of reported R. planticola infections is growing, without a concomitant increase in research on the microbe or its pathogenesis. Previous genomic studies demonstrating genetic similarities between R. planticola and Klebsiella pneumoniae suggest that capsule biosynthesis, mucoid phenotype, biofilm production, and lipopolysaccharide (endotoxin) synthesis may all be potential virulence factors of R. planticola. We present a unique case of R. planticola infection of the biliary tract 5 years after biliary surgery in a patient with no previously documented risk factors. We also use in silico techniques to predict virulence factors of R. planticola. CASE PRESENTATION: This case report is the first to discuss a R. planticola infection in the biliary tract of late onset post-surgery (5 years) in a Caucasian patient with no previously documented risk factors. CONCLUSIONS: An in-depth search of the current literature did not yield other similar cases of R. planticola infections. Moreover, to the best of our knowledge, our case is the first case of R. planticola isolated from post-endoscopic retrograde cholangiopancreatography (ERCP) as part of biliary sepsis not associated with gastroenteritis. The late onset of the infection in our patient and the results of the in silico analysis suggest that R. planticola may have survived exposure to the host immune system through the creation of an intracellular biofilm or in a non-culturable but viable state (NCBV) for the 5-year period. The in silico analysis also suggests that biofilms, enterobactin, and mucoid phenotype may play a role in the pathogenesis of R. planticola. However, further research is needed to illuminate the significance of pili, capsule biosynthesis, and lipopolysaccharide (LPS) in the virulence of R. planticola. Lastly, as our patient did not have any risk factors previously associated with R. planticola, we suggest that biliary tract stricture, cholecystitis, and prior surgery may be possible novel risk factors.


Subject(s)
Cholangitis , Cholecystectomy, Laparoscopic , Anti-Bacterial Agents/therapeutic use , Bile Ducts, Intrahepatic , Cholangitis/drug therapy , Cholecystectomy, Laparoscopic/adverse effects , Constriction, Pathologic/drug therapy , Enterobacteriaceae , Humans
14.
Mol Metab ; 51: 101222, 2021 09.
Article in English | MEDLINE | ID: mdl-33781939

ABSTRACT

BACKGROUND: Mitochondrial uncouplers are well-known for their ability to treat a myriad of metabolic diseases, including obesity and fatty liver diseases. However, for many years now, mitochondrial uncouplers have also been evaluated in diverse models of cancer in vitro and in vivo. Furthermore, some mitochondrial uncouplers are now in clinical trials for cancer, although none have yet been approved for the treatment of cancer. SCOPE OF REVIEW: In this review we summarise published studies in which mitochondrial uncouplers have been investigated as an anti-cancer therapy in preclinical models. In many cases, mitochondrial uncouplers show strong anti-cancer effects both as single agents, and in combination therapies, and some are more toxic to cancer cells than normal cells. Furthermore, the mitochondrial uncoupling mechanism of action in cancer cells has been described in detail, with consistencies and inconsistencies between different structural classes of uncouplers. For example, many mitochondrial uncouplers decrease ATP levels and disrupt key metabolic signalling pathways such as AMPK/mTOR but have different effects on reactive oxygen species (ROS) production. Many of these effects oppose aberrant phenotypes common in cancer cells that ultimately result in cell death. We also highlight several gaps in knowledge that need to be addressed before we have a clear direction and strategy for applying mitochondrial uncouplers as anti-cancer agents. MAJOR CONCLUSIONS: There is a large body of evidence supporting the therapeutic use of mitochondrial uncouplers to treat cancer. However, the long-term safety of some uncouplers remains in question and it will be critical to identify which patients and cancer types would benefit most from these agents.


Subject(s)
Mitochondria/drug effects , Neoplasms/drug therapy , Uncoupling Agents/therapeutic use , Adenosine Triphosphate/metabolism , Animals , Clinical Trials as Topic , Disease Models, Animal , Humans , Mitochondria/metabolism , Neoplasms/pathology , Oxidative Phosphorylation/drug effects , Reactive Oxygen Species/metabolism , Tumor Microenvironment/drug effects , Uncoupling Agents/pharmacology , Warburg Effect, Oncologic/drug effects
15.
JMIR Ment Health ; 8(2): e25835, 2021 Feb 08.
Article in English | MEDLINE | ID: mdl-33481760

ABSTRACT

BACKGROUND: Social distancing guidelines for COVID-19 have caused a rapid transition to telephone and video technologies for delivering treatment for substance use disorders (SUDs). OBJECTIVE: This study examined the adoption of these technologies across the SUD service continuum, acceptance of these technologies among service providers, and intent of providers to use these technologies after the pandemic. Additional analysis using the validated technology acceptance model (TAM) was performed to test the potential applications of these technologies after the pandemic. The study objectives were as follows: (1) to assess the use of telehealth (telephone and video technologies) for different SUD services during COVID-19 in May-June 2020, (2) to assess the intended applications of telehealth for SUD services beyond COVID-19, (3) to evaluate the perceived ease of use and value of telehealth for delivering SUD services, and (4) to assess organizational readiness for the sustained use of telehealth services. METHODS: An online survey on the use of telephonic and video services was distributed between May and August 2020 to measure the current use of these services, perceived organizational readiness to use these services, and the intent to use these services after COVID-19. In total, 8 of 10 regional Addiction Technology Transfer Centers representing 43 states distributed the survey. Individual organizations were the unit of analysis. RESULTS: In total, 457 organizations responded to the survey. Overall, the technology was widely used; >70% (n>335) of organizations reported using telephone or video platforms for most services. The odds of the intent of organizations to use these technologies to deliver services post COVID-19 were significantly greater for all but two services (ie, telephonic residential counseling and buprenorphine therapy; mean odds ratio 3.79, range 1.87-6.98). Clinical users preferred video technologies to telephone technologies for virtually all services. Readiness to use telephone and video technologies was high across numerous factors, though telephonic services were considered more accessible. Consistent with the TAM, perceived usefulness and ease of use influenced the intent to use both telephone and video technologies. CONCLUSIONS: The overall perceived ease of use and usefulness of telephonic and video services suggest promising post-COVID-19 applications of these services. Survey participants consistently preferred video services to telephonic services; however, the availability of telephonic services to those lacking easy access to video technology is an important characteristic of these services. Future studies should review the acceptance of telehealth services and their comparative impact on SUD care outcomes.

16.
Alcohol Alcohol ; 55(5): 540-546, 2020 Aug 14.
Article in English | MEDLINE | ID: mdl-32599612

ABSTRACT

AIMS: Comorbid alcohol use and depression have the highest prevalence among emerging adults and are associated with a number of consequences. Self-medication theory posits individuals with depression use alcohol to cope with their negative emotions. Preliminary work has investigated the social context of depression-related drinking and found that solitary drinking is a risky, atypical behaviour in emerging adulthood that is associated with alcohol misuse. However, it is unknown about what is unfolding in the moment that is driving depression-related drinking in solitary contexts. Accordingly, we used an experimental study to examine if shame mediated the association between depression and in-lab alcohol craving. METHODS: Emerging adults (N = 80) completed a shame induction followed by an alcohol cue exposure in either a solitary or social condition. We used moderated mediation to test hypotheses. RESULTS: Consistent with hypotheses, conditional indirect effects supported the mediation of depression and alcohol craving through shame among those in the solitary condition, but not in the social condition. There was no support for guilt as a mediator. CONCLUSION: Our study demonstrates that shame is a specific emotional experience that contributes to solitary drinking among depressed emerging adults. It is important to use these results to inform interventions that directly target solitary contexts and shame.


Subject(s)
Alcohol Drinking/psychology , Craving , Depression/complications , Depression/psychology , Loneliness , Shame , Adolescent , Adult , Female , Guilt , Humans , Male , Risk Factors , Social Interaction , Students , Surveys and Questionnaires , Young Adult
17.
Health Soc Care Community ; 28(6): 2208-2217, 2020 11.
Article in English | MEDLINE | ID: mdl-32462722

ABSTRACT

This study describes the understanding, experiences and expectations of families living in rural and remote Australia regarding core concepts relating to disability service provision, including person-centred practice (PCP), family-centred practice (FCP), transdisciplinary practice (TDP), choice, control, inclusion, and equity. Thirteen parents or carers, each with a child with an intellectual disability aged between 6 and 16 years, living in rural and remote areas as described by the Australian Standard Geographical Classification - Remoteness Area (ASGC-RA) and Modified Monash Model (MMM) - were recruited through distribution of flyers (hard copies or by email) to clinicians, schools, and advocacy agencies. Semi-structured interviews were conducted with participants either in-person or via telephone between July and October 2015. Data were analysed using thematic analysis. Participants reported that their understanding of many of the disability principles (PCP, FCP, choice, control, inclusion, and equity) was different from providers, and that many providers struggled to understand families, and therefore they did not share meaning of the principles of best practice disability supports. Families did not identify transdisciplinary practice as a core issue or tenet of effective service delivery. Families also reported experiences of missing out on services, feeling a sense of isolation in their communities, struggling to access skilled therapists, and difficulty finding supports and goals that were relevant to their child. The quality of supports that these families accessed was often below the standard that they expected. They did not expect that support standards will change in rural and remote Australia, so many have very low expectations of the National Disability Insurance Scheme (NDIS) in the future. Although more data will need to be collected as the NDIS and its markets mature, these data show that many rural and remote participants and their supporters have a variety of concerns about how they will access quality allied health services through the Scheme.


Subject(s)
Caregivers/psychology , Disabled Children/psychology , Parents/psychology , Rural Health Services/organization & administration , Adolescent , Australia , Child , Humans , Insurance, Disability , Male , Rural Population/statistics & numerical data
18.
Ecol Evol ; 10(3): 1510-1525, 2020 Feb.
Article in English | MEDLINE | ID: mdl-32076530

ABSTRACT

The leaf economic traits such as leaf area, maximum carbon assimilation rate, and venation are all correlated and related to water availability. Furthermore, leaves are often broad and large in humid areas and narrower in arid/semiarid and hot and cold areas. We use optimization theory to explain these patterns. We have created a constrained optimization leaf model linking leaf shape to vein structure that is integrated into coupled transpiration and carbon assimilation processes. The model maximizes net leaf carbon gain (NPPleaf) over the loss of xylem water potential. Modeled relations between leaf traits are consistent with empirically observed patterns. As the results of the leaf shape-venation relation, our model further predicts that a broadleaf has overall higher NPPleaf compared to a narrowleaf. In addition, a broadleaf has a lower stomatal resistance compared to a narrowleaf under the same level of constraint. With the same leaf area, a broadleaf will have, on average, larger conduits and lower total leaf xylem resistance and thus be more efficient in water transportation but less resistant to cavitation. By linking venation structure to leaf shape and using water potential as the constraint, our model provides a physical explanation for the general pattern of the covariance of leaf traits through the safety-efficiency trade-off of leaf hydraulic design.

19.
Biochim Biophys Acta Mol Cell Res ; 1867(6): 118674, 2020 06.
Article in English | MEDLINE | ID: mdl-32035967

ABSTRACT

Increased Pur-alpha (Pura) protein levels in animal models alleviate certain cellular symptoms of the disease spectrum amyotrophic lateral sclerosis/frontotemporal dementia (ALS/FTD). Pura is a member of the Pur family of evolutionarily conserved guanine-rich polynucleotide binding proteins containing a repeated signature PUR domain of 60-80 amino acids. Here we have employed a synthetic peptide, TZIP, similar to a Pur domain, but with sequence alterations based on a consensus of evolutionarily conserved Pur family binding domains and having an added transporter sequence. A major familial form of ALS/FTD, C9orf72 (C9), is due to a hexanucleotide repeat expansion (HRE) of (GGGGCC), a Pur binding element. We show by circular dichroism that RNA oligonucleotides containing this purine-rich sequence consist largely of parallel G-quadruplexes. TZIP peptide binds this repeat sequence in both DNA and RNA. It binds the RNA element, including the G-quadruplexes, with a high degree of specificity versus a random oligonucleotide. In addition, TZIP binds both linear and G-quadruplex repeat RNA to form higher order G-quadruplex secondary structures. This change in conformational form by Pur-based peptide represents a new mechanism for regulating G quadruplex secondary structure within the C9 repeat. TZIP modulation of C9 RNA structural configuration may alter interaction of the complex with other proteins. This Pur-based mechanism provides new targets for therapy, and it may help to explain Pura alleviation of certain cellular pathological aspects of ALS/FTD.


Subject(s)
C9orf72 Protein/genetics , C9orf72 Protein/metabolism , DNA-Binding Proteins/chemistry , Peptides/pharmacology , Transcription Factors/chemistry , C9orf72 Protein/chemistry , Circular Dichroism , DNA Repeat Expansion/drug effects , DNA-Binding Proteins/metabolism , G-Quadruplexes/drug effects , Humans , Models, Molecular , Molecular Mimicry , Peptides/chemical synthesis , RNA/chemistry , RNA/metabolism , Thermodynamics , Transcription Factors/metabolism
20.
Int J Behav Nutr Phys Act ; 16(1): 118, 2019 11 29.
Article in English | MEDLINE | ID: mdl-31783871

ABSTRACT

BACKGROUND: Schools located in rural parts of the United States and North Carolina have benefited proportionally less from the federal Safe Routes to School (SRTS) program than their more urban counterparts. We investigated whether and how diverse elementary and middle school communities throughout North Carolina have engaged in a SRTS-inspired, multi-sectoral initiative called the Active Routes to School (ARTS) project over the course of 5 years (2013 through 2017). METHODS: Analyses included a study sample of 2602 elementary and middle schools in North Carolina, 853 that participated in the ARTS project over the five-year study period and 1749 that had not. Statistical models controlling for county- and school-level confounders predicted schools' involvement in walking and bicycling-promotive events, programs, and policies over time. RESULTS: Schools' engagement with ARTS Project programming increased significantly over the study period, with 33% of eligible schools participating with the project by the end of 2017. Participation was most common in promotional events. Such event participation predicted engagement with regularly recurring programming and school- and district-level establishment of biking- and walking-facilitative policies. Lower income schools were more likely to establish recurring bike and walk programs than wealthier schools, whereas rural schools were less likely than city schools to participate in promotional events, yet equally as likely as other schools to participate in recurring bike and walk programs. CONCLUSIONS: Schools' engagement with the North Carolina ARTS Project diffused despite many schools' rural geographies and lower socioeconomic status. Further, participation in one-time promotional events can portend schools' establishment of recurring walking and biking programs and supportive policies.


Subject(s)
Bicycling/physiology , Child Behavior/physiology , School Health Services , Walking/physiology , Child , Exercise , Humans , North Carolina , Rural Population , Schools
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