Chlorophyll a and Primary Productivity Dynamics in Kentucky Lake Mainstem and Embayment Habitats.

Chlorophyll α (Chl α) has been used as a proxy for phytoplankton biomass, while primary productivity (PP), the rate at which carbon is fixed into phytoplankton cells, is an indicator of how quickly carbon is turned over within the phytoplankton community. The purpose of this research was to examine the spatial distribution of and the relationship between Chl α and PP seasonally in the main channel of Kentucky Lake reservoir and two embayments of contrasting land use. Correlation coefficients (r) for Chl α versus PP were 0.45 in Ledbetter embayment, 0.55 in Panther embayment, and 0.57 in the main channel. ANOVA indicated that seasonal effects drove dynamics at all three sites with stronger correlations occurring during winter, spring, and fall; correlations were weakest or broke down completely during summer. We conclude that during times of high Chl α standing stock (e.g., summer and fall), the Chl α-PP relationship may be disrupted or decoupled by lower nutrient inputs later in the growing season as suggested by analyses of annual patterns of total nitrogen (TN) and total phosphorus (TP) at the sites. Chl α and PP are positively correlated, in general, but the relationship may be confounded or disrupted at times by strong seasonal environmental effects such as nutrient inputs, light, and temperature. Further, predicting PP from Chl α for the management purposes of identifying areas of vulnerability for future algal blooms, hypoxia, and habitat degradation should be viewed with caution; the predictive power between the two variables deserves further refinement

Chlorophyll a and Primary Production Dynamics in Kentucky Lake: 2009-2018

Chlorophyll α (chl α) can be used as a proxy for phytoplankton biomass, while primary productivity (PP), the rate at which carbon is fixed into phytoplankton cells, is an indicator of how quickly carbon is turned over within the phytoplankton community. The purpose of this research was to examine the spatial distribution of chl α seasonally in Kentucky Lake and to examine the relationship between chl α and PP in two embayments of contrasting land use. The two sites analyzed are Ledbetter and Panther embayments. Data analysis showed that the chl α and PP were highly correlated; r=0.45 in Ledbetter and r=0.55 in Panther. Seasonally the highest correlations occurred during winter (r=0.55-0.85) and spring (r=0.55-0.85). The lowest correlations occurred during the summer in both embayments (r=0.10-0.25). It was concluded that the highest correlations occur during times of the year when standing stock of chl α is lowest (winter and spring). It was also concluded that during times of high chl α standing stock (summer and fall), the chl α- PP correlation was disrupted or decoupled by lower nutrient inputs later in the growing season. Therefore, the hypothesis was that the correlation would show strong seasonal variations due to factors such as light intensity and nutrient inputs. Nutrients of the embayments are described by the nitrogen to phosphorus ratio calculated. The nutrient description is used as a way to correlate the chl α and productivity to other variables

Asymmetric discrimination of non-speech tonal analogues of vowels

Published in final edited form as: J Exp Psychol Hum Percept Perform. 2019 February ; 45(2): 285–300. doi:10.1037/xhp0000603.Directional asymmetries reveal a universal bias in vowel perception favoring extreme vocalic articulations, which lead to acoustic vowel signals with dynamic formant trajectories and well-defined spectral prominences due to the convergence of adjacent formants. The present experiments investigated whether this bias reflects speech-specific processes or general properties of spectral processing in the auditory system. Toward this end, we examined whether analogous asymmetries in perception arise with non-speech tonal analogues that approximate some of the dynamic and static spectral characteristics of naturally-produced /u/ vowels executed with more versus less extreme lip gestures. We found a qualitatively similar but weaker directional effect with two-component tones varying in both the dynamic changes and proximity of their spectral energies. In subsequent experiments, we pinned down the phenomenon using tones that varied in one or both of these two acoustic characteristics. We found comparable asymmetries with tones that differed exclusively in their spectral dynamics, and no asymmetries with tones that differed exclusively in their spectral proximity or both spectral features. We interpret these findings as evidence that dynamic spectral changes are a critical cue for eliciting asymmetries in non-speech tone perception, but that the potential contribution of general auditory processes to asymmetries in vowel perception is limited.Accepted manuscrip

Addressing student models of energy loss in quantum tunnelling

We report on a multi-year, multi-institution study to investigate student reasoning about energy in the context of quantum tunnelling. We use ungraded surveys, graded examination questions, individual clinical interviews, and multiple-choice exams to build a picture of the types of responses that students typically give. We find that two descriptions of tunnelling through a square barrier are particularly common. Students often state that tunnelling particles lose energy while tunnelling. When sketching wave functions, students also show a shift in the axis of oscillation, as if the height of the axis of oscillation indicated the energy of the particle. We find inconsistencies between students' conceptual, mathematical, and graphical models of quantum tunnelling. As part of a curriculum in quantum physics, we have developed instructional materials to help students develop a more robust and less inconsistent picture of tunnelling, and present data suggesting that we have succeeded in doing so.Comment: Originally submitted to the European Journal of Physics on 2005 Feb 10. Pages: 14. References: 11. Figures: 9. Tables: 1. Resubmitted May 18 with revisions that include an appendix with the curriculum materials discussed in the paper (4 page small group UW-style tutorial

Short photoperiod-induced decrease of histamine H3 receptors facilitates activation of hypothalamic neurons in the Siberian Hamster

Nonhibernating seasonal mammals have adapted to temporal changes in food availability through behavioral and physiological mechanisms to store food and energy during times of predictable plenty and conserve energy during predicted shortage. Little is known, however, of the hypothalamic neuronal events that lead to a change in behavior or physiology. Here we show for the first time that a shift from long summer-like to short inter-like photoperiod, which induces physiological adaptation to winter in the Siberian hamster, including a body weight decrease of up to 30%, increases neuronal activity in the dorsomedial region of the arcuate nucleus (dmpARC) assessed by electro physiological patch-clamping recording. Increased neuronal activity in short days is dependent on a photoperiod-driven down-regulation of H3 receptor expression and can be mimicked in long-day dmpARC neurons by the application of the H3 receptor antagonist, clobenproprit. Short-day activation of dmpARC neurons results in increased c-Fos expression. Tract tracing with the trans-synaptic retrograde tracer, pseudorabies virus, delivered into adipose tissue reveals a multisynaptic neuronal sympathetic outflow from dmpARC to white adipose tissue. These data strongly suggest that increased activity of dmpARC neurons, as a consequence of down-regulation of the histamine H3 receptor, contributes to the physiological adaptation of body weight regulation in seasonal photoperiod

Development and Validation of the Female Gamer Stereotypes Scale (FGSS)

Female gamers belong to a stereotyped social group. The stereotypes associated with female gamers may be associated with issues such as sexism and gender discrimination in the gaming community. However, few tools exist to properly assess the complex nature of the stereotypes held about this group. The present paper describes the development and validation of the Female Gamer Stereotypes Scale (FGSS), which offers a multifaceted measure of the stereotypical beliefs toward women who play video games. Five first-order FGSS factors have emerged and been consistent with data across three studies. The five dimensions target areas of stereotypes toward female gamers such as their lack of femininity, lack of sociability, weak gaming competence, reliance on men in gaming, and gaming preferences. A total of 1266 individuals from both a student sample and large national U.S. samples participated the studies. In the first study, a large pool of potential scale items was generated. In study 2 and 3, the five-factor, 20-item FGSS was developed and validated through five subsamples, including gamers, male gamers, female gamers, non-gamers, and the general population. Across all subsamples, the FGSS demonstrated excellent content and construct validity. Implications of results and recommendations for future studies are discussed

Improving Rural Bone Health and Minimizing Fracture Risk in West Virginia: Validation of the World Health Organization FRAX® Assessment Tool as a Phone Survey for Osteoporosis Detection

West Virginia ranks second nationally in population ≥ 65 years old placing our state at greater risk for osteoporosis and fracture. The gold standard for detecting osteoporosis is dual X-ray absorptiometry (DXA), yet over half of West Virginia’s counties do not have this machine. Due to access barriers, a validated phone-administered fracture prediction tool would be beneficial for osteoporosis screening. The World Health Organization’s FRAX® fracture prediction tool was administered as a phone survey to 45 patients; these results were compared to DXA bone mineral density determination. Results confirmed that the FRAX® phone survey is as reliable as DXA in detecting osteoporosis or clinically significant osteopenia: 92% positive predictive value, 100% negative predictive value, 100% sensitivity and 91% specificity when compared to the gold standard. These promising results allow for the development of telephone-based protocols to improve osteoporosis detection, referral and treatment especially in areas with health care access barriers

Extra embryos: The ethics of cryopreservation in Ecuador and elsewhere

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73714/1/ae.2007.34.1.181.pd

Unilateral heat accelerates bone elongation and lengthens extremities of growing mice

Linear growth failure results from a broad spectrum of systemic and local disorders that can generate chronic musculoskeletal disability. Current bone lengthening protocols involve invasive surgeries or drug regimens, which are only partially effective. Exposure to warm ambient temperature during growth increases limb length, suggesting that targeted heat could noninvasively enhance bone elongation. We tested the hypothesis that daily heat exposure on one side of the body unilaterally increases femoral and tibial lengths. Mice (N = 20) were treated with 40 °C unilateral heat for 40 min/day for 14 days post-weaning. Non-treated mice (N = 6) served as controls. Unilateral increases in ear (8.8%), hindfoot (3.5%), femoral (1.3%), and tibial (1.5%) lengths were obtained. Tibial elongation rate was \u3e 12% greater (15 μm/day) on the heat-treated side. Extremity lengthening correlated with temperature during treatment. Body mass and humeral length were unaffected. To test whether differences persisted in adults, mice were examined 7-weeks post-treatment. Ear area, hindfoot, femoral, and tibial lengths were still significantly increased ∼6%, 3.5%, 1%, and 1%, respectively, on the heat-treated side. Left-right differences were absent in non-treated controls, ruling out inherent side asymmetry. This model is important for designing noninvasive heat-based therapies to potentially combat a range of debilitating growth impediments in children