Predictable Patterns Of Disruptive Selection In Stickleback In Postglacial Lakes

Disruptive selection is often assumed to be relatively rare, because it is dynamically unstable and hence should be transient. However, frequency-dependent interactions such as intraspecific competition may stabilize fitness minima and make disruptive selection more common. Such selection helps explain the maintenance of genetic variation and may even contribute to sympatric speciation. There is thus great interest in determining when and where disruptive selection is most likely. Here, we show that there is a general trend toward weak disruptive selection on trophic morphology in three-spine stickleback (Gasterosteus aculeatus) in 14 lakes on Vancouver Island. Selection is inferred from the observation that, within a lake, fish with intermediate gill raker morphology exhibited slower growth than phenotypically extreme individuals. Such selection has previously been shown to arise from intraspecific competition for alternate resources. However, not all environments are equally conducive to disruptive selection, which was strongest in intermediate-sized lakes where both littoral and pelagic prey are roughly balanced. Also, consistent with theory, we find that sexual dimorphism in trophic traits tends to mitigate disruptive selection. These results suggest that it may be possible to anticipate the kinds of environments and populations most likely to experience disruptive selection.Integrative Biolog

Social change and educational problems in three modern Asian societies:: Japan, Singapore and Hong Kong a comparative study.

The main theme of the thesis is a discussion of education and social change in the three East Asian societies over the post-war period. The thesis is divided into four sections. The first is a background study. In this section, the social and educational backgrounds of the respective societies are discussed. Special attention is paid to the stress on modernization as a common orientation in social developments. Major concepts and definitions of modernization are discussed and an attempt is made to study the modern development of these societies in the light of modernization theories. The second section is a discussion of education in technological societies. The concepts of industrial, post- industrial and technological societies are discussed in the light of the works of the major social theorists and futurologists. The development of technology and its relationships with education are outlined. Further, the social implications and problems of technological and scientific education are analysed. The third section is a discussion of education in rapidly changing societies. The acceleration of social change in modern societies is traced. Rapid changes in the educational scene of the respective societies are also outlined. The social implications and problems of the rapidity of change and the role and functions of education in face of rapid change are discussed. The fourth section is a discussion of the emergence of credentialism in modern societies and its manifestation in education. Negative aspects of diplomaism, excessive competition and examination systems are discussed. In conclusion, an overall review of the relationships between education and social development is made. There is an analysis of the fundamental educational problems of modem societies, and finally, in this context, a suggestion that the objectives of education should be reconsidered

DramaQA: Character-Centered Video Story Understanding with Hierarchical QA

Despite recent progress on computer vision and natural language processing, developing video understanding intelligence is still hard to achieve due to the intrinsic difficulty of story in video. Moreover, there is not a theoretical metric for evaluating the degree of video understanding. In this paper, we propose a novel video question answering (Video QA) task, DramaQA, for a comprehensive understanding of the video story. The DramaQA focused on two perspectives: 1) hierarchical QAs as an evaluation metric based on the cognitive developmental stages of human intelligence. 2) character-centered video annotations to model local coherence of the story. Our dataset is built upon the TV drama "Another Miss Oh" and it contains 16,191 QA pairs from 23,928 various length video clips, with each QA pair belonging to one of four difficulty levels. We provide 217,308 annotated images with rich character-centered annotations, including visual bounding boxes, behaviors, and emotions of main characters, and coreference resolved scripts. Additionally, we provide analyses of the dataset as well as Dual Matching Multistream model which effectively learns character-centered representations of video to answer questions about the video. We are planning to release our dataset and model publicly for research purposes and expect that our work will provide a new perspective on video story understanding research.Comment: 21 pages, 10 figures, submitted to ECCV 202

Axion dark matter search using the storage ring EDM method

We propose using the storage ring EDM method to search for the axion dark matter induced EDM oscillation in nucleons. The method uses a combination of B and E-fields to produce a resonance between the $g-2$ spin precession frequency and the background axion field oscillation to greatly enhance sensitivity to it. An axion frequency range from $10^{-9}$ Hz to 100 MHz can in principle be scanned with high sensitivity, corresponding to an $f_a$ range of $10^{13}$ GeV $\leq f_a \leq 10^{30}$ GeV, the breakdown scale of the global symmetry generating the axion or axion like particles (ALPs)

Evolution of Parathyroid Hormone Receptor Family and Their Ligands in Vertebrate

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Cinq façons de réussir à évaluer et améliorer la continuité pédagogique dans les programmes de formation des professions de la santé

Presence of educational continuity is essential for progressive development of competence. Educational continuity appears to be a simple concept, but in practice, it is challenging to implement and evaluate because of its multifaceted nature. In this Black Ice article, we present some practical tips to help avoid misunderstandings and irregularities in implementation for those involved in evaluating and improving educational continuity in health professions education programs

How Online Diaries Persuade Customers — The Role of Narratives

Online diary is a series of reviews in chronological order generated by customers to record their experience over time, which is a new type of online review emerging in the medical beauty industry. This study extends narrative transportation theory to explore the effect of the dynamic structure of online diaries on persuasion. We posit that emotional shift and utilitarian value can positively enhance online diary persuasion through improving transportation, and the relationship between the temporal flow and persuasion is converse U shape. The moderating role of social influence and visual content richness to the main effect is also investigated in this study. We collected real data to test our hypotheses utilizing Natural Language Processing (NLP) method and econometric model. This study is expected to make both theoretical and practical contributions

Associations between Physical Activity and Obesity Defined by Waist-To-Height Ratio and Body Mass Index in the Korean Population

Objective This study investigated the associations between physical activity and the prevalence of obesity determined by waist-to-height ratio (WHtR) and body mass index (BMI). Methods This is the first study to our knowledge on physical activity and obesity using a nationally representative sample of South Korean population from The Korea National Health and Nutrition Examination Survey. We categorized individuals into either non-obese or obese defined by WHtR and BMI. Levels of moderate-to-vigorous physical activity were classified as ‘Inactive’, ‘Active’, and ‘Very active’ groups based on the World Health Organization physical activity guidelines. Multivariable logistic regression was used to examine the associations between physical activity and the prevalence of obesity. Results Physical activity was significantly associated with a lower prevalence of obesity using both WHtR and BMI. Compared to inactive men, odds ratios (ORs) (95% confidence intervals [CIs]) for obesity by WHtR ≥0.50 were 0.69 (0.53–0.89) in active men and 0.76 (0.63–0.91) in very active men (p for trend = 0.007). The ORs (95% CIs) for obesity by BMI ≥25 kg/m2 were 0.78 (0.59–1.03) in active men and 0.82 (0.67–0.99) in very active men (p for trend = 0.060). The ORs (95% CIs) for obesity by BMI ≥30 kg/m2 were 0.40 (0.15–0.98) in active men and 0.90 (0.52–1.56) in very active men (p for trend = 0.978). Compared to inactive women, the ORs (95% CIs) for obesity by WHtR ≥0.50 were 0.94 (0.75–1.18) in active women and 0.84 (0.71–0.998) in very active women (p for trend = 0.046). However, no significant associations were found between physical activity and obesity by BMI in women. Conclusions We found more significant associations between physical activity and obesity defined by WHtR than BMI. However, intervention studies are warranted to investigate and compare causal associations between physical activity and different obesity measures in various populations

Pre-low raising in Cantonese and Thai: Effects of speech rate and vowel quantity

Although pre-low raising (PLR) has been extensively studied as a type of contextual tonal variation, its underlying mechanism is barely understood. This paper explored the effects of phonetic vs phonological duration on PLR in Cantonese and Thai and examined how speech rate and vowel quantity interact with its realization in these languages, respectively. The results for Cantonese revealed that PLR always occurred before a large falling excursion (i.e., high-low); in other tonal contexts, it was observed more often in faster speech. In the Thai corpus, PLR also occurred before large falling excursions, and there was more PLR in short vowels. These results are discussed in terms of possible accounts of the underlying mechanism of PLR