Research output performance of Dyscalculia (2011–2020): A Bibliometric Analysis

This research paper presents a Bibliometric analysis on Dyscalculia research publications published during 2011-2020 in Web of Science. The result has pointed out the merits and weaknesses of the journal which can be helpful for its further development. Total publications during the study period (2011-2020) were 560 articles on dyscalculia, distributed in 12 document types and eight languages, published by 1406 authors with 14768 cited references 591 organizations, and 51 countries. The 560 articles are scattered in 226 journals in which Journal of Frontiers in Psychology (49), was the most published and ranked first (IF2020 =2.067). This study determines that there are many top papers originated from journals with the highest Impact Factor and higher rank in the Web of Science category. The result reveals that the publications are not fit into Bradford’s law of scatterings

Arsenic content in certain marine brown algae and mangroves from Goa coast

283-285Arsenic has been estimated in 7 species each of brown algae and mangroves, including different parts of Sargassum cinereun. Arsenic is more concentrated in brown algae [concentration/factor(CF) range 1.5 - 7 x 10(3)] as compared to mangroves (CF < 1). In brown algae organic As is accounted for about 75-90% of total, but in S. cinereum and Sphacelaria furcigera about 50-60% inorganic As is noted. Basal thallus and reproductive organs of S. cinereum have higher concentration of total and organic As than active photosynthetic portions. However, holdfast accumulates lesser As but its organic As is high (80%). Arsenic in younger leaves of mangroves is marginally more (0.23 mg.kg-1 dry wt.) than that of mature and yellow leaves (0.16 mg. kg-1)

Thermal design of a roof-mounted CLFR collection system for a desert absorption chiller

The paper presents a mathematical model for the thermal design of a new solar energy collection system adopted to drive an absorption chiller for air-conditioning a modern desert home. The collection system employs roof-mounted, retractable compact linear Fresnel mirrors. The conceptual design is described, and the mathematical model is presented. A hypothetical, two-floor home located in a typical desert site is employed for demonstration. The performance of the proposed solar collection system is evaluated employing a mathematical model presented here. Investigations are conducted to assess the effect of various design parameters on system efficiency. It is concluded that it is feasible to carry the entire house cooling loads employing only solar power collected with the proposed roof-mounted system, even though the house is located in an exceptionally hot desert environment. Moreover, the proposed system may require less roof space than a Photovoltaic-based system when correct conditions are present. © 2013 Taylor & Francis

Structure, Dynamics, and Branch Migration of a DNA Holliday Junction: A Single-Molecule Fluorescence and Modeling Study

AbstractThe Holliday junction (HJ) is a central intermediate of various genetic processes, including homologous and site-specific DNA recombination and DNA replication. Elucidating the structure and dynamics of HJs provides the basis for understanding the molecular mechanisms of these genetic processes. Our previous single-molecule fluorescence studies led to a model according to which branch migration is a stepwise process consisting of consecutive migration and folding steps. These data led us to the conclusion that one hop can be more than 1 basepair (bp); moreover, we hypothesized that continuous runs over the entire sequence homology (5 bp) can occur. Direct measurements of the dependence of the fluorescence resonance energy transfer (FRET) value on the donor-acceptor (D-A) distance are required to justify this model and are the major goal of this article. To accomplish this goal, we performed single-molecule FRET experiments with a set of six immobile HJ molecules with varying numbers of bps between fluorescent dyes placed on opposite arms. The designs were made in such a way that the distances between the donor and acceptor were equal to the distances between the dyes formed upon 1-bp migration hops of a HJ having 10-bp homology. Using these designs, we confirmed our previous hypothesis that the migration of the junction can be measured with bp accuracy. Moreover, the FRET values determined for each acceptor-donor separation corresponded very well to the values for the steps on the FRET time trajectories, suggesting that each step corresponds to the migration of the branch at a defined depth. We used the dependence of the FRET value on the D-A distance to measure directly the size for each step on the FRET time trajectories. These data showed that one hop is not necessarily 1 bp. The junction is able to migrate over several bps, detected as one hop and confirming our model. The D-A distances extracted from the FRET properties of the immobile junctions formed the basis for modeling the HJ structures. The composite data fit a partially opened, side-by-side model with adjacent double-helical arms slightly kinked at the four-way junction and the junction as a whole adopting a global X-shaped form that mimics the coaxially stacked-X structure implicated in previous solution studies