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Academic literature on the topic 'Poly-variance'
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Journal articles on the topic "Poly-variance"
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A.M., Gnatyuk. "Biomorphological рeculiarities and poly-variance of ontogenesis of Delphinium sergii Wissjul. (Ranunculaceae Juss.) ex situ". Plant Introduction 74 (1 червня 2017): 26–33. https://doi.org/10.5281/zenodo.2299478.
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<strong>Objective </strong> – to study biomorphologycal peculiarities and poly-variance of ontognesis of <em>Delphinium sergii </em>Wissjul. at M.M. Gryshko National Botanical Garden of the NAS of Ukraine. <strong>Material and methods. </strong>It is investigated of ontogenesis and polymorphism of <em>D. sergii</em> plants in culture. <strong>Results.</strong>The poly-variance (structural and dynamical) in different individuals is discovered and described. The structural poly-variance is discovered in methods of reproduction, dimensional and morphological heterogeneity of even-aged individuals and individuals at one stage of ontogeny too. The dynamical poly-variance is manifested in a different rate of passage stages in ontogeny. The difference in the formation of inflorescences, shape and color of flowers and seeds, passing stages of ontogeny, size, reproduction and longevity in different individuals are showed. The different ways of creating a <em>D. sergii</em> bimorph in ontogeny is described. <strong>Conclusions.</strong> It is noted that for study of age structure on natural or introduction populations of <em>D. sergii</em> is sufficient consideration of the main species ontogenetic states. The study should be carried out before flowering of plants. For identification the ontogenetic states of individuals is possible to explore the aerial parts only (number, size, and degree dissected leaves blades). It is not for damaging the soil and plants.
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Erben, Antonija, Josipa Matić, Nikola Basarić, and Ivo Piantanida. "The Phenanthridine-modified Tyrosine Dipeptide." Croatica chemica acta 92, no. 2 (2019): 249–58. http://dx.doi.org/10.5562/cca3542.
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Dipeptide 4 containing two unnatural amino acids, a modified tyrosine and a phenanthridine derivative, was synthesized. Binding of the dipeptide to a series of polynucleotides including ct-DNA, poly A - poly U, poly (dAdT)2, poly dG - poly dC and poly (dGdC)2 was investigated by thermal denaturation experiments, fluorescence spectroscopy and circular dichroism. Thermal denaturation experiments indicated that dipeptide 4 at pH 5.0, when phenanthridine is protonated, stabilizes ds-DNA, whereas it destabilizes ds-RNA. At pH 7.0, when the phenanthridine is not protonated, effects of 4 to the polynucleotide melting temperatures are negligible. At pH 5.0, dipeptide 4 stabilized DNA double helices, and the changes in the CD spectra suggest different modes of binding to ds-DNA, most likely the intercalation to poly dG- poly dC and non-specific binding in grooves of other DNA polynucleotides. At variance to ds-DNA, addition of 4 destabilized ds-RNA against thermal denaturation and CD results suggest that addition of 4 probably induced dissociation of ds-RNA into ss-RNA strands due to preferred binding to ss-RNA. Thus, 4 is among very rare small molecules that stabilize ds-DNA but destabilize ds-RNA. However, fluorescence titrations with all polynucleotides at both pH values gave similar binding affinity (log Ka ≈ 5), indicating nonselective binding. Preliminary photochemical experiments suggest that dipeptide 4 reacts in the photochemical reaction, which affects polynucleotides chirality, presumably via quinone methide intermediates that alkylate DNA.
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Víllora, Beatriz, Elisa Larrañaga, Santiago Yubero, Antonio Alfaro, and Raúl Navarro. "Relations among Poly-Bullying Victimization, Subjective Well-Being and Resilience in a Sample of Late Adolescents." International Journal of Environmental Research and Public Health 17, no. 2 (2020): 590. http://dx.doi.org/10.3390/ijerph17020590.
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The present study examined the relations among poly-bullying victimization (experiencing multiple forms of peer bullying), resilience and subjective well-being. This study specifically examined late adolescents’ resilience as a moderator of the relation between poly-bullying victimization and subjective well-being. In a region of central Spain, 1430 undergraduate students (64% females, 36% males), aged between 18 and 22 years, completed three self-reported measures, including bullying victimization experiences, self-reported subjective well-being and resilience. A substantial proportion of the participants (16.9%) reported being victims of poly-bullying. The results showed that the poly-bullying victimization group reported the poorest subjective well-being and the lowest resilience levels. The regression analyses revealed that resilience was significantly and positively associated with subjective well-being, and resilience moderated the association between poly-bullying victimization and subjective well-being. However, the relation was very weak and accounted for only an additional 1% of variance in the participants’ subjective well-being. Future research should assess resilience trajectories of youth exposed to multiple forms of bullying victimization in order to better understand the potential protective effect of resilience over negative mental health outcomes.
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Moisan, Caroline, Martine Hébert, Mylène Fernet, Martin Blais, and Laetitia Mélissande Amédée. "Resilience Portfolios and Poly-Strengths: Identifying Strengths Associated with Wellbeing after Adversity." International Journal of Child and Adolescent Resilience 6, no. 1 (2020): 19–35. http://dx.doi.org/10.7202/1069073ar.
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Objectives: This study aimed to describe the prevalence of traumas and strengths in a representative sample of Quebec youth and to test whether poly-strengths were associated with low psychological distress, after controlling for poly-traumas. Method: Using data from the Quebec Youths’ Romantic Relationships survey (QYRRS), hierarchical logistic regressions were conducted to examine the relationship between poly-strengths and low levels of psychological distress, and to identify which strengths were associated with outcomes, after accounting for demographic variables and individuals’ experiences of traumas. Results: More than a third of the sample experienced 4 traumas or more (37.0%). The average number of experienced traumas was 3.04 out of 10 measured traumas. More than half of the sample had at least 5 strengths, the average number of strengths being 3.95 (out of 8). Two third (67.6%) of the sample did not suffer from psychological distress. Among poly-victims, half of the participants (49.6%) showed clinical symptoms of distress. Poly-strengths were uniquely associated with low of clinical distress. After accounting for demographics and poly-traumas, poly-strengths explained 24.2% of the variance of low levels of psychological distress. Self-esteem, optimism, parental support and attachment, number of sources of support, social support (seeking secure base), and capacity to adapt (resiliency) were uniquely associated with low levels of distress. Conclusion and Implications: The combination of strengths decreases the likelihood of experiencing clinical levels of psychological distress, which can contribute to healthy functioning in context of adversities. Findings highlight the importance of promoting multiple and diverse strengths among youth.
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Liu, Qi-Ying, Anne E. Schaffner, Yoong H. Chang, Dragan Maric, and Jeffery L. Barker. "Persistent Activation of GABAAReceptor/Cl− Channels by Astrocyte-Derived GABA in Cultured Embryonic Rat Hippocampal Neurons." Journal of Neurophysiology 84, no. 3 (2000): 1392–403. http://dx.doi.org/10.1152/jn.2000.84.3.1392.
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Whole cell patch-clamp recordings using Cl−-filled pipettes revealed more negative levels of baseline current and associated current variance in embryonic rat hippocampal neurons co-cultured on a monolayer of astrocytes than those cultured on poly-d-lysine. These effects were mimicked by culturing neurons on poly-d-lysine in astrocyte-conditioned medium (ACM). The baseline current and variance decreased immediately in all cells after either local perfusion with saline or exposure to bicuculline, an antagonist of GABA at GABAAreceptor/Cl− channels. Baseline current and variance in all cells reached a nadir at ∼0 mV, the calculated equilibrium potential for Cl−. Perfusion of ACM rapidly induced a sustained current in neurons, which also reversed polarity at ∼0 mV. Bicuculline attenuated or eliminated the ACM-induced current at a concentration that completely blocked micromolar GABA-induced current. Quantitative analyses of spontaneously occurring fluctuations superimposed on the ACM-induced current revealed estimated unitary properties of the underlying channel activity similar to those calculated for GABA's activation of GABAA receptor/Cl−channels. Bicuculline-sensitive synaptic-like transients, which reversed at ∼0 mV, were also detected in neurons cultured in ACM, and these were immediately eliminated along with the negative baseline current and superimposed current fluctuations by perfusion. Furthermore bicuculline-sensitive synaptic-like transients were rapidly and reversibly triggered when ACM was acutely applied. ACM induced an increase in cytoplasmic Ca2+ in cultured embryonic hippocampal neurons that was completely blocked by bicuculline and strychnine. We conclude that astrocytes release diffusible substances, most likely GABA, that persistently activate GABAA receptor/Cl−channels in co-cultured neurons.
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Steffensen, Mikkel Tandrup, Michael Döhler, Dmitri Tcherniak, and Jon Juel Thomsen. "Variance estimation of modal parameters from the poly-reference least-squares complex frequency-domain algorithm." Mechanical Systems and Signal Processing 223 (January 2025): 111905. http://dx.doi.org/10.1016/j.ymssp.2024.111905.
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Xiao, Xiao, Yuhang Liu, and Yanci Zhang. "Iterative Low-Poly Building Model Reconstruction from Mesh Soups Based on Contour." Remote Sensing 16, no. 4 (2024): 695. http://dx.doi.org/10.3390/rs16040695.
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Existing contour-based building-reconstruction methods face the challenge of producing low-poly results. In this study, we introduce a novel iterative contour-based method to reconstruct low-poly meshes with only essential details from mesh soups. Our method focuses on two primary targets that determine the quality of the results: reduce the total number of contours, and generate compact surfaces between contours. Specifically, we implemented an iterative pipeline to gradually extract vital contours by loss and topological variance, and potential redundant contours will be removed in a post-processing procedure. Based on these vital contours, we extracted the planar primitives of buildings as references for contour refinement to obtain compact contours. The connection relationships between these contours are recovered for surface generation by a contour graph, which is constructed using multiple bipartite graphs. Then, a low-poly mesh can be generated from the contour graph using our contour-interpolation algorithm based on polyline splitting. The experiments demonstrated that our method produced satisfactory results and outperformed the previous methods.
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Astudillo, Igor, Karla Aspee, Jaime Palomino, Oscar A. Peralta, Victor H. Parraguez, and Monica De los Reyes. "Meiotic Development of Canine Oocytes from Poly-Ovular and Mono-Ovular Follicles after In Vitro Maturation." Animals 13, no. 4 (2023): 648. http://dx.doi.org/10.3390/ani13040648.
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Poly-ovular follicles are defined as those with more than one oocyte present in single follicles. The occurrence frequency of this follicle type is higher in canines than that in other species. This study aimed to evaluate the in vitro meiotic maturation of dog oocytes from this follicle type in comparison to those from mono-ovular follicles of various sizes (small antral, medium antral, and large antral) considering different phases of the estrus cycle (anestrus, proestrus, estrus, and diestrus). Canine oocytes were obtained separately from the poly-ovular and mono-ovular antral follicles from the ovaries of adult females. In each experimental replicate, cumulus-oocyte complexes (COCs) from poly-ovular and mono-ovular follicles were incubated in supplemented TCM-199 at 38.5 °C and 5% CO2 for 72 h. After culturing, the meiotic development of each oocyte was evaluated using epifluorescence microscopy. Meiotic stages were classified into germinal vesicle (GV), germinal vesicle breakdown (GVBD), first metaphase (MI), and second metaphase (MII). Data were evaluated using an analysis of variance. Oocytes from poly-ovular follicles at all phases exhibited a higher (p < 0.05) percentage of oocytes arrested at the GV stage than those from mono-ovular follicles, showing the highest rate of GV in small antral follicles during anestrus. In contrast, there were no differences in MII rates (p < 0.05) in oocytes from mono-ovular and poly-ovular follicles during the estrus and diestrus phases in all sizes evaluated, with the highest MII rate in estrus. These results suggest that oocytes from poly-ovular follicles can resume meiosis at a slower rate than those from mono-ovular follicles; however, the maturation in vitro of such oocytes is possible. Furthermore, the relationship between the maturation capacity of oocytes from both poly-ovular and mono-ovular follicles depends on the ovarian cycle and follicular development.
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Abegunrin, T. P., O. I. Ojo, and M. O. Lasisi. "Comparative Assessment of Crop Water Productivity of Drip Irrigated Green Pepper under Poly-House and Open-Field Conditions." Asian Soil Research Journal 7, no. 4 (2023): 45–52. http://dx.doi.org/10.9734/asrj/2023/v7i4140.
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Crop water productivity (CWP) is a crucial factor in determining the sustainability of agricultural practices. Drip irrigation is a method that has shown potential in improving CWP in crop production. The study aimed to compare the crop water productivity of green pepper production under poly-house and open-field environments during 2020/2021 and 2021/2022 growing seasons. The experiment was conducted during the dry seasons of 2020.2021 and 2021/2022 at the Teaching and Research Field of Federal Polytechnic, Ado-Ekiti, Nigeria. The beds were prepared, nursery was established, drip irrigation system was installed and fumigation was carried out before transplanting. The experimental design was a randomized complete block (RCBD) with nine replications in each environment. The same design was applied to both poly-house and open-field conditions. The factors are environment (poly-house and open-field) and irrigation intervals of 5, 6 and 7 days (I5, I6 and I7). Data obtained were subjected to analysis of variance and Tukey’s Honestly Significant Difference (HSD) was used for multiple comparison. Drip irrigation was applied to all plots at different irrigation intervals. The results showed that the crop water productivity under poly-house and open-field environments in 2020/2021 growing season were: I5: 29.67, I6: 36.97, I7: 20.92 and I5: 17.06, I6: 21.45, I7: 12.21 kg/m3. Similarly, in the 2021/2022 growing season, the CWP values were I5: 16.90, I6: 23.27, I7: 12.95 and I5: 9.60, I6: 14.01, I7: 6.81 kg/m3 under poly-house and open-field, respectively. The results revealed that water productivity was more efficient at low levels of water supply in the poly-house during the 2020/2021 and 2021/2022 growing seasons. The production of green pepper under poly-house increased water conservation, reduced nutrient leaching, enhanced crop productivity for sustainable agricultural practices and water management.
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Sun, Grace Y., Meena Navidi, Fu-Gen Yoa, W. Gibson Wood, and Albert Y. Sun. "Effects of chronic ethanol administration on poly-phosphoinositide metabolism in the mouse brain: variance with age." Neurochemistry International 22, no. 1 (1993): 11–17. http://dx.doi.org/10.1016/0197-0186(93)90063-b.
Full textConference papers on the topic "Poly-variance"
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Wu, Qinglin, Peng Tian, and Quang Cao. "Poly(N-Isopropylacrylamide-Co-Methacrylic Acid) Micro/Nanoparticles: Formulation, Size Distribution and Use for Cu++ Adsorption." In 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70019.
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Poly(N-isopropylacrylamide-co-methacrylic Acid (PNIPAAm-MAA) micro/nano-particles were formulated. The effect of monomer ratio, surfactant, and crosslinker contents on size/size distribution, phase transition behavior, and Cu2+ adsorption efficiency of the particles was investigated. The ionized MAA groups brought both temperature and pH sensitiveness to the PNIPAAm-MAA copolymer particles. As monomer ratio and crosslinker content increased and the amount of surfactants decreased, the particle size increased. The influence of the crosslinker content on particle size was less significant compared to the effect of monomer ratio and surfactants. When temperature increased, the particles tended to shrink and reduced their size to near or below 100nm. The Weibull distribution was successfully used to describe the diameter distribution of the nano-particles, whereas the lognormal was deemed not adequate for that purpose. The method of moments was used to predict parameters of the Weibull distribution. The Weibull parameters were recovered from diameter mean and variance, both of which were predicted from temperature. The distributions predicted from various temperatures for MAA/NIPAAm ratios of 0.05 and 0.10 showed trends similar to those in the data. Studies on chelation efficiency of the particles with Cu2+ ions showed that the amount of the Cu2+ ions adsorbed varied with temperature. Particle size played a very important role in the adsorption and nanoparticles greatly improved adsorption efficiency, compared with their micro hydrogel counterparts. The amount of adsorption increased with increase of MAA ratio in copolymers, but adsorption efficiency decreased with increased particle size. The high adsorption efficiency of metal ions by PNIPAAm-MAA polymer particles provides an effective technique for recovering metal ions (e.g., Cu2+) from wood treated with metal based preservatives.
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Sugumar, Suresh, Gopinath Dhamodaran, Pradeepkumar Seetharaman, and Rajkamal Sivakumar. "Study of Hardness and Compression Strength of Carbon Fibre Reinforced Poly-Lactic Acid Composites Fabricated by Fused Deposition Modelling." In Automotive Technical Papers. SAE International, 2024. https://doi.org/10.4271/2024-01-5227.
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<div class="section abstract"><div class="htmlview paragraph">3-Dimensional (3D) printing is an additive manufacturing technology that deposits materials in layers to build a three-dimensional component. Fused Deposition Modelling (FDM) is the most widely used 3D printing technique to produce the thermoplastic components. In FDM, the printing process parameters have a major role in controlling the performance of fabricated components. In this study, carbon fibre reinforced polymer composites were fabricated using FDM technique based on Taguchi's Design of experimental approach. The matrix and reinforcement materials were poly-lactic acid (PLA) and short carbon fibre, respectively. The goal of this study is to optimize the FDM process parameters in order to obtain the carbon fibre reinforced PLA composites with enhanced hardness and compressive strength values. Shore-D hardness and compression tests were carried out as per American Society for Testing and Materials (ASTM) D2240 and ASTM D695 standards respectively, to measure the output responses. The FDM process parameters considered in this study are layer height, infill density and infill pattern. The grey relational analysis (GRA) based multi-response optimization technique is used to optimize the process parameters. Analysis of variance is used to determine the most influential process parameter. The results showed that 3D printed components with improved performance characteristics could be achieved at 0.1mm layer height, Grid shaped infill pattern, and 75g/cm<sup>3</sup> infill density with a Shore-D hardness value of 76 and compressive strength of 42 N/mm<sup>2</sup>. It was identified that for multi-response optimization of equal weightage condition, the layer height contributed 44.44% followed by the contribution of Infill pattern and Infill density by 25.93% and 18.04% respectively. The developed regression model predicted the grade value at 90% confidence interval.</div></div>