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The nematode genus Rhabdias comprises over 100 species of parasitic nematodes that infect amphibians and reptiles, with a wide geographical distribution. To date, 25 species have been reported from the Neotropical region. Despite this diversity, few integrative studies, combining morphological and molecular data have been conducted to characterize species within the genus. Therefore, the main objective of the present study is to describe, through an integrative approach, a new species of Rhabdias found parasitizing the lungs of an anuran with a high concentration of skin toxins, Dendrobates tinctorius, from the Brazilian Amazon. The new species of Rhabdias is characterized by an elongated body, uniform cuticular inflation attenuated at the extremities, 4 submedian lips and 2 lateral lips, a cup-shaped buccal capsule, and an elongated tail. The morphology of the buccal capsule in Rhabdias camposi n. sp. is also unique among Rhabdias representatives, as this morphological character is known so far. Thus, we emphasize that a detailed study of this morphological trait for species of the genus will be crucial for species diagnosis. Molecular and phylogenetic analyses were performed using mitochondrial COI gene sequences. We observed that the new taxon is closely related to Rhabdias waiapi, a parasite of Pristimantis chiastonotus. Rhabdias camposi n. sp. represents the 26th species of the genus reported from the Neotropics in amphibians and the first described from a Dendrobates tinctorius host in Brazil.
Frailty is an ageing-related syndrome of physiological decline, heightening vulnerability and increasing risk of adverse health outcomes. Nutritional deficiencies, particularly in vitamins B9, B12 and D, are prevalent among the elderly owing to physiological changes and reduced food intake. Research suggests a correlation between low levels of these vitamins and an elevated risk of frailty. Vitamin B9, crucial for DNA synthesis and cell division, shows potential in frailty prevention, although evidence regarding supplementation remains inconclusive. Similarly, vitamin B12, essential for nerve function and red blood cell formation, presents conflicting findings regarding its impact on frailty prevention. Vitamin D, essential for bone health and muscle function, is linked to frailty risk, yet studies on the efficacy of supplementation yielded mixed results. The mechanisms involving these vitamins, including their roles in DNA methylation and inflammation regulation, highlight the need for further research to clarify their direct impact on frailty prevention. Maintaining optimal levels of vitamins B9, B12 and D may reduce frailty, but older individuals need a complete approach that includes proper nutrition, physical activity and other preventive measures.
The impact the body has upon complex cognitive capabilities has long challenged cognitive scientists. Insights into the complex interplay between how we see, what we see, and how we interpret what we think we saw and remembered are offered by a surprising source: the effects magicians create.
Obsessive–compulsive disorder (OCD) is a neuropsychiatric disorder characterized by recurrent intrusive thoughts and ritualized behaviors, often aimed at reducing distress. OCD is heterogeneous in its presentation and many patients with OCD experience a variety of different symptoms throughout their course of illness. Efforts to understand symptom domains in OCD have typically identified three to five symptom domains, such as the domains of doubt/checking, contamination, superstitions/rituals, symmetry/hoarding, and taboo thoughts. Recent studies in the genetics of OCD have suggested a common OCD dimension may provide additional information above and beyond the previously identified symptom domains. Thus, we sought to test a hierarchical model of lifetime OCD symptoms and evaluate the utility of the inclusion of a common OCD dimension.
Methods
Participants included 999 individuals participating in the OCD Collaborative Genetics Study (OCGS) and an additional 2363 individuals participating in the OCD Genetic Association Study (OCGAS). We evaluated unidimensional, 5-factor, and hierarchical models of lifetime OCD symptom presentation using confirmatory factor analysis.
Results
Results suggested that the hierarchical model best fit the data. Further evaluation of these models using a Bayesian testlet response model showed that lifetime presence of specific OCD symptoms was differentially associated with lifetime OCD severity. Moreover, symptoms associated with greater lifetime severity were generally reported less frequently than symptoms present at lower levels of lifetime severity. Implications of these findings and future directions are discussed.
Assuming that cognitive complexity follows a single, centralized trajectory overlooks key gaps: (1) the scarcity of cognitive studies on non-centralized species; (2) the potential of alternative neural architectures to support complex behavior; and (3) the influence of ecological niche pressures. Here we present evidence of curiosity-like behavior in a jellyfish, challenging the assumed link between centralized brains and complex cognition.
The convergent evolution described for invertebrate cognition might have occurred in similar fashion with motivational valence, the other pillar of response selection. Primitive examples of such properties as liking (versus wanting), dependence on appetite, and especially attenuation with delay might provide clues to a longstanding puzzle: how incentive salience, classical conditioning, emotional arousal, and mental behavior in general are apparently all entwined with valence.
Coombs and Trestman provide an integrative, embodied framework for the evolution of complex cognition. However, they overlook the critical role of ecological and environmental contexts in such evolution. Our commentary highlights its anthropocentric biases and emphasizes the need for species-specific approaches that account for diverse sensory modalities, ecologies, and social environments while prioritizing organism-specific challenges and ecological niches.
Translational science methods often fall short due to the complexity of the healthcare delivery environment. We developed a methodology that involves multiple interest holders working within a pre-competitive consortium to develop solutions to translational barriers. The methodology supports innovative collaboration in a stepwise fashion: elucidating challenges, designing solutions, enabling implementation, monitoring, learning, disseminating, and catalyzing. Cases that benefit most from a structured collaborative methodology are those where diverse needs require elucidation and alignment. Application of the methodology to develop regulatory, clinical, and business innovations has shown the importance of an innovation facilitator and the capacity-building potential of collective skill enhancement.
Sub-Saharan Africa (SSA) is currently undergoing rapid urbanisation, a transition that is closely linked to the adoption of sedentary lifestyles and Westernised dietary habits. This shift has contributed to a substantial rise in obesity and diet-related non-communicable diseases (DR-NCDs), placing a significant strain on already burdened healthcare systems. Among the key modifiable risk factors driving this epidemiological transition are changes in dietary patterns. Western-style diets have been shown to promote inflammation and trigger metabolic and immune dysregulation, factors that underlie the development of DR-NCDs. Conversely, many Tanzanian heritage diets incorporate a diverse array of nutrient-rich foods prepared using techniques that minimise the use of oils, sweeteners and preservatives. These diets predominantly use whole grains, legumes and fruits, foods high in dietary fibre and nutraceuticals. Nutraceuticals are known to have both immunomodulatory and metabolic benefits and could potentially counteract the negative effects associated with Western-style diets. However, the limited scientific documentation of these heritage diets endangers future research into their potential health benefits. This underscores the need for targeted efforts to preserve and promote traditional dietary practices. In this review, we summarise the diversity of heritage diets from four distinct tribes in Northern Tanzania – the Maasai, Chagga, Pare and Hadzabe – who have historically exhibited low rates of DR-NCDs but are now experiencing rapid urbanisation and lifestyle changes. We briefly describe the dietary patterns of these tribes and examine the potential links between the declining usage of traditional dietary practices and the rising prevalence of DR-NCDs in Tanzania.
Declining participation by family childcare home (FCCH) providers in the Child and Adult Care Food Program (CACFP) may stem from inadequate tiered reimbursements for nutritious foods. During the COVID-19 pandemic, federal waivers temporarily eliminated tiers and increased reimbursements. We evaluated provider, sponsor and family perceptions of CACFP benefits and challenges in general and regarding the temporary removal of tiers and increased reimbursement rates.
Design:
From September 2023 to February 2024, FCCH providers, CACFP sponsors and CACFP family recipients in California participated in semi-structured interviews about CACFP benefits and challenges, perception of tiers and the COVID-19 waiver, quality of food and business viability. Thematic analysis was conducted using the immersion crystallisation method.
Setting:
Virtual interviews with California providers, sponsors and families.
Participants:
FCCH providers (n 31), CACFP sponsors (n 10) and CACFP family recipients (n 6).
Results:
Providers and sponsors reported that the higher temporary reimbursement rate positively impacted food budgets and quality. Pandemic-era facilitators of CACFP participation included the higher reimbursement rate, tier removal and a hybrid model for monitoring visits. Benefits beyond the pandemic included nutrition education and supporting child food security. Families valued CACFP for providing a variety of high-quality foods. However, barriers to CACFP participation persist, including administrative burden, inadequate reimbursements, strict regulations and the impacts of the pandemic and inflation.
Conclusions:
Increasing CACFP reimbursements while reducing other participation barriers can better support FCCH providers’ and sponsors’ participation. Supporting FCCH CACFP participation and retention can enhance access to healthy and nutritious meals for children from families with low income.
Nutrition education plays a crucial role in improving the nutritional status of pregnant women, yet evidence of its impact in low-income settings like Ethiopia is limited. This study evaluated the effectiveness of facility-based nutrition education and counseling on pregnant women’s knowledge, dietary practices, and Fe-folic acid supplement use.
Design:
A cluster randomised controlled trial was conducted in Addis Ababa, Ethiopia, involving 683 pregnant women across twenty health centres assigned to intervention or control groups. Antenatal care providers in the intervention group received training on pregnancy nutrition and counseling, while the control group continued standard care per national guidelines. A total of 683 pregnant women were enrolled during their first and second antenatal care (ANC) visits. Mixed-effects linear regression was used to evaluate outcomes.
Study setting:
The study was conducted in Addis Ababa, Ethiopia, from August to December 2017.
Participants:
Pregnant women attending ANC follow-ups and healthcare providers working in ANC units.
Results:
The intervention group demonstrated significant improvements in knowledge, including iodised salt use (difference-in-differences (DID) 23 %), correct Fe-folic acid supplementation duration (DID 68 %) and the need for additional meals during pregnancy (DID 49·9 %). Dietary practices improved with higher dietary diversity (DID 32·3 %), increased dairy consumption (MD 1·2 v. –0·1; DID 1·2 per week) and higher Fe-folic acid supplementation (MD 4·9 v. 1·6; DID 3·2 per week).
Conclusion:
Nutrition education and counseling during ANC visits significantly improved pregnant women’s knowledge and dietary practices. Integrating and strengthening these interventions into routine ANC services could effectively enhance dietary intake and health outcomes.
Given its assumption that cognition is embodied, the multitrait framework could benefit from engaging with recent work in embodied cognitive science. Here, we introduce three lines of contemporary research—from ecological psychology, basal cognition, and embodied cognitive neuroscience—which help contextualize the article’s “trait-linkage” findings and further support the authors’ arguments for evolutionary continuity between simple and complex cognitive traits.
We focus on active sensing and trait-linkage to show that a core mechanism, SARA-C (Search, Align, Relate, Abstract, Cognize), underlying human g, may unify the emergence of cognitive complexity (CC) in evolution and development. Bayesian modeling shows how SARA-C evolves, advancing from reflex-driven behavior (Annelids) to associative learning (arthropods), abstraction (cephalopods), and hierarchical control (vertebrates) to reasoning and self-awareness (humans).
Our target article proposed that vertebrates, cephalopod mollusks, and euarthropods independently converged onto high levels of brain and cognitive complexity and that this macroevolutionary trend was coupled with and facilitated by the acquisition of a small set of pivotal traits, used in visuomotor control of three-dimensional and targeted movements. In response to commentaries that challenged our working premise and conclusions, we (1) use the concept of aggregate complexity to define brain and cognitive complexity and dispel misconceptions about anthropocentric bias, (2) call attention to the explanatory value and power of convergence as an important evolutionary concept, (3) highlight certain architectural and organizational features of the nervous system as scaffolds for the evolutionary expansion of behavioral and cognitive complexity, and (4) consider the phylogenetic distribution of phenomenal consciousness in relation to our findings. We also try to foster a greater appreciation for cognition as a process that involves whole animals as aggregate systems and that requires an extended repertoire of laws and principles to understand its evolution.
To successfully recruit and retain faculty members from underrepresented backgrounds (URBs), we need to understand the factors that attract them to research careers in the first place. However, scholarship in this area has focused largely on students who are contemplating research careers rather than faculty members who are currently in such careers.
Methods:
This study explores the career motivations of early-career health researchers (faculty members and postdoctoral fellows) from URBs. It was conducted as part of a cluster randomized trial across 25 academic institutions investigating a support intervention. We conducted 1-hour semi-structured qualitative interviews with scholars from URBs in both the intervention and control arms of the trial. To our knowledge, this is the largest qualitative study of early-career faculty members from URBs to date.
Results:
Seventy-eight individuals were interviewed. Our analysis revealed six key themes pertinent to participants’ motivations to pursue research careers: (1) love of science; (2) making a larger impact; (3) happenstance and economic considerations; (4) family, community, and a path out of poverty; (5) the role of mentors and role models; and (6) support programs for scholars from URBs.
Conclusions:
Our results align with prior studies while offering new insights into the motivations of URB faculty members in research careers. These insights can and should inform the design of programs to both recruit and retain URM faculty members in research careers.
Thermal protective clothing (TPC) protects firefighters from physical threats associated with structural firefighting. However, it also limits the release of body heat generated, which can result in hyperthermia and dehydration. Despite the prevalence of winter structure fires in the United States, there is a paucity of cold-weather firefighting research.
Study Objective:
This study documented physiological responses to moderate-intensity exercise in a cold environment while wearing TPC with the hypothesis that while exercising in firefighting TPC, a cold environment would maintain normal core body temperature and decrease extremity temperature compared to a thermal neutral environment.
Methods:
Fourteen firefighters (two females; 30.9 [SD = 8.1] years) participated in both a thermal neutral (20°C) and cold (-8°C) condition simulation. Each subject was outfitted with a heart rate (HR) monitor, eight surface temperature sensors, and a core temperature (Tc) capsule prior to donning TPC. For each condition, subjects walked on a treadmill in an environmental chamber to simulate the common firefighting work intervals of two 20-minute sessions, with a short rest in between, followed by a 20-minute rehabilitation period. Body temperatures, HR, respiratory rate (RR), rate of perceived exertion (RPE), and thermal sensation, comfort, and preference were recorded during exercise and recovery.
Results:
Core temperature, HR, RR, and RPE increased during exercise in both conditions. Mean skin temperature (MST) rose during the thermal neutral condition but not during the cold condition. Overall, Tc (0.3 [SD = 0.4]°C; P = .0142), HR (26.3 [SD = 8.36] BPM), RR (3.56 [SD = 5.6] BPM), RPE (2.0 [SD = 1.9]), and MST (3.4 [SD = 1.2]°C) were all higher at the end of the neutral condition compared to the cold condition. During recovery, most measures returned to baseline after approximately five-to-20 minutes in both conditions, but they recovered more slowly in the thermal neutral condition.
Conclusion:
Moderate-intensity exercise in TPC increased physiological and perceptual measures more in a thermal neutral environment than a cold environment. Recovery was faster following the cold condition. This may allow firefighters to work for longer durations or recover faster, possibly allowing for fewer crews on scene. However, this study did not account for the risk of other cold induced conditions due to prolonged exposure, such as frostbite. Further investigations should be conducted on cold weather firefighting and its impact on firefighters to establish guidelines and standard operating procedures.
Zinc supplementation is a critical adjunct therapy for managing acute childhood diarrhoea, particularly in low-income countries (LICs) and lower middle-income countries (LMICs). However, adherence to the recommended zinc regimen remains a major challenge, limiting its effectiveness in real-world settings. This systematic review and meta-analysis aimed to estimate the pooled adherence rates to zinc supplementation for diarrhoea in children under 5 and identify key determinants of adherence. A comprehensive search of PubMed, Embase, Scopus, Google Scholar, ProQuest, and CINAHL was conducted between 2000 and 2024. A total of 10 observational studies were included, with pooled adherence of 63.45% (95% CI: 51.62–75.28) for 10 days regimen and 34.58% (95% CI: 7.08–62.09) for 14 days regimen, along with high heterogeneity. Sensitivity analysis confirmed robustness of these estimates. Key factors associated with adherence included caregiver education, provider counselling, medication acceptability, and economic constraints related to caregiver buying capacity. Doi plot asymmetry suggested possible publication bias for 10 and 14 days regimen. Overall, adherence to zinc therapy remains sub-optimal, particularly for 14 days regimen compared to 10 days regimen. Targeted interventions addressing behavioural, provider, and formulation related barriers are urgently needed to optimize zinc adherence and improve diarrhoea outcomes globally.