70 research outputs found
A minimaj-preserving crystal on ordered multiset partitions
We provide a crystal structure on the set of ordered multiset partitions,
which recently arose in the pursuit of the Delta Conjecture. This conjecture
was stated by Haglund, Remmel and Wilson as a generalization of the Shuffle
Conjecture. Various statistics on ordered multiset partitions arise in the
combinatorial analysis of the Delta Conjecture, one of them being the minimaj
statistic, which is a variant of the major index statistic on words. Our
crystal has the property that the minimaj statistic is constant on connected
components of the crystal. In particular, this yields another proof of the
Schur positivity of the graded Frobenius series of the generalization
due to Haglund, Rhoades and Shimozono of the coinvariant algebra . The
crystal structure also enables us to demonstrate the equidistributivity of the
minimaj statistic with the major index statistic on ordered multiset
partitions.Comment: 17 pages; v2 contains minor changes suggested by referee, references
update
PreocupaçÔes de carreira e adaptabilidade : estudo exploratĂłrio com uma amostra de candidatos a sargentos e oficiais do ExĂ©rcito PortuguĂȘs
Tese de mestrado, Psicologia (Psicologia dos Recursos Humanos, do Trabalho e das OrganizaçÔes), Universidade de Lisboa, Faculdade de Psicologia, 2010O presente trabalho consiste num estudo exploratório sobre as preocupaçÔes de
carreira e as dimensÔes da adaptabilidade, baseando-se na Perspectiva de
Desenvolvimento da Carreira de Donald Super e na Perspectiva Construtivista de
Mark Savickas. Pretende-se, ainda, contribuir para a investigação acerca do Inventårio
sobre Adaptabilidade, que se encontra ainda em estudo no Ăąmbito de um Projecto
Internacional.
Foram aplicados o Inventårio das PreocupaçÔes de Carreira e o Inventårio sobre
Adaptabilidade a uma amostra de 75 adultos candidatos a Sargentos e Oficiais do
ExĂ©rcito PortuguĂȘs. Os resultados obtidos tendem a confirmar as hipĂłteses de
investigação formuladas, apontando para a relação entre a variåvel idade e as tarefas
de desenvolvimento das fases da carreira Exploração e Estabelecimento, para a
predominùncia das dimensÔes Confiança e Cooperação, e para a relação entre
preocupaçÔes de carreira e dimensÔes da adaptabilidade. Apresentam-se as
conclusÔes do presente estudo, algumas limitaçÔes deste e futuras linhas de
investigação. Tecem-se também algumas consideraçÔes sobre as implicaçÔes do
estudo para as prĂĄticas de gestĂŁo de carreira.This work is an exploratory study about the career concerns and the dimensions of
adaptability, based on the Perspective of the Career Development of Donald Super
and the Constructivist Perspective of Mark Savickas. It is also intended to contribute
to the research on the Career Adapt-Abilities Inventory, which is still under
investigation as part of an International Project.
The Career Concerns Inventory and the Career Adapt-Abilities Inventory were
applied to a sample of 75 adult candidates to Sergeants and Officers of the Portuguese
Army. The results seem to confirm the research hypotheses, pointing to the relation
between the variable age and the developmental tasks of the Exploration and
Establishment career phases, to the predominance of the dimensions Cooperation, and
Confidence and also to the relation between career concerns and adaptability
dimensions. The findings of this study, some of its limitations and future research
paths are presented. Some reflections are also discussed in what concerns the study's
implications for the career management practices
Hydrodynamics Versus Intracellular Coupling in the Synchronization of Eukaryotic Flagella
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Communicating Results of a Dietary Exposure Study Following Consumption of Traditionally Smoked Salmon
One expectation of community-based participatory research (CBPR) is participant access to study results. However, reporting experimental data produced by studies involving biological measurements in the absence of clinical relevance can be challenging to scientists and participants. We applied best practices in data sharing to report the results of a study designed to explore polycyclic aromatic hydrocarbons (PAHs) absorption, metabolism, and excretion following consumption of traditionally-smoked salmon by members of the Confederated Tribes of the Umatilla Indian Reservation (CTUIR). A dietary exposure study was developed, wherein 9 Tribal members consumed 50 grams of traditionally-smoked salmon and provided repeated urine samples over 24 hours. During recruitment, participants requested access to their data following analysis. Disclosing data is an important element of community-based participatory research, and must be treated with the same rigor as that given to the data analysis. The field of data disclosure is relatively new, but when handled correctly can improve education within the community, reduce distrust and enhance environmental health literacy. Using the results from this study, we suggest mechanisms for sharing data with a Tribal community.This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Mary Ann Liebert, Inc., and can be found at: http://www.liebertpub.com/overview/environmental-justice/259
Quantifying energy expenditure in childhood: utility in managing pediatric metabolic disorders.
BACKGROUND: Energy expenditure prediction equations are used to estimate energy intake based on general population measures. However, when using equations to compare with a disease cohort with known metabolic abnormalities, it is important to derive one's own equations based on measurement conditions matching the disease cohort. OBJECTIVE: We aimed to use newly developed prediction equations based on a healthy pediatric population to describe and predict resting energy expenditure (REE) in a cohort of pediatric patients with thyroid disorders. METHODS: Body composition was measured by DXA and REE was assessed by indirect calorimetry in 201 healthy participants. A prediction equation for REE was derived in 100 healthy participants using multiple linear regression and z scores were calculated. The equation was validated in 101 healthy participants. This method was applied to participants with resistance to thyroid hormone (RTH) disorders, due to mutations in either thyroid hormone receptor ÎČ or α (ÎČ: female n = 17, male n = 9; α: female n = 1, male n = 1), with deviation of REE in patients compared with the healthy population presented by the difference in z scores. RESULTS: The prediction equation for REE = 0.061 * Lean soft tissue (kg) - 0.138 * Sex (0 male, 1 female) + 2.41 (R2 = 0.816). The mean ± SD of the residuals is -0.02 ± 0.44 kJ/min. Mean ± SD REE z scores for RTHÎČ patients are -0.02 ± 1.26. z Scores of -1.69 and -2.05 were recorded in male (n = 1) and female ( n = 1) RTHα patients. CONCLUSIONS: We have described methodology whereby differences in REE between patients with a metabolic disorder and healthy participants can be expressed as a z score. This approach also enables change in REE after a clinical intervention (e.g., thyroxine treatment of RTHα) to be monitored
Intervenable factors associated with suicide risk in transgender persons: a respondent driven sampling study in Ontario, Canada
Long-term thermal sensitivity of Earthâs tropical forests
The sensitivity of tropical forest carbon to climate is a key uncertainty in predicting global climate change. Although short-term drying and warming are known to affect forests, it is unknown if such effects translate into long-term responses. Here, we analyze 590 permanent plots measured across the tropics to derive the equilibrium climate controls on forest carbon. Maximum temperature is the most important predictor of aboveground biomass (â9.1 megagrams of carbon per hectare per degree Celsius), primarily by reducing woody productivity, and has a greater impact per °C in the hottest forests (>32.2°C). Our results nevertheless reveal greater thermal resilience than observations of short-term variation imply. To realize the long-term climate adaptation potential of tropical forests requires both protecting them and stabilizing Earthâs climate
Revealing the sequence and resulting cellular morphology of receptor-ligand interactions during plasmodium falciparum invasion of erythrocytes
During blood stage Plasmodium falciparum infection, merozoites invade uninfected erythrocytes via a complex, multistep process involving a series of distinct receptor-ligand binding events. Understanding each element in this process increases the potential to block the parasite's life cycle via drugs or vaccines. To investigate specific receptor-ligand interactions, they were systematically blocked using a combination of genetic deletion, enzymatic receptor cleavage and inhibition of binding via antibodies, peptides and small molecules, and the resulting temporal changes in invasion and morphological effects on erythrocytes were filmed using live cell imaging. Analysis of the videos have shown receptor-ligand interactions occur in the following sequence with the following cellular morphologies; 1) an early heparin-blockable interaction which weakly deforms the erythrocyte, 2) EBA and PfRh ligands which strongly deform the erythrocyte, a process dependant on the merozoite's actin-myosin motor, 3) a PfRh5-basigin binding step which results in a pore or opening between parasite and host through which it appears small molecules and possibly invasion components can flow and 4) an AMA1-RON2 interaction that mediates tight junction formation, which acts as an anchor point for internalization. In addition to enhancing general knowledge of apicomplexan biology, this work provides a rational basis to combine sequentially acting merozoite vaccine candidates in a single multi-receptor-blocking vaccine
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