196,142 research outputs found
ON THE CLIQUE NUMBER OF THE GENERATING GRAPH OF A FINITE GROUP
No full textThe generating graph Γ(G) of a finite group G is the graph defined on the elements of G with an edge connecting two distinct vertices if and only if they generate G. The maximum size of a complete subgraph in Γ(G) is denoted by ω(G). We prove that if G is a non-cyclic finite group of Fitting height at most 2 that can be generated by 2 elements, then ω(G)=q+1, where q is the size of a smallest chief factor of G which has more than one complement. We also show that if S is a non-abelian finite simple group and G is the largest direct power of S that can be generated by 2 elements, then ω(G)≤(1+o(1))m(S), where m(S) denotes the minimal index of a proper subgroup in S
On the maximal number of elements pairwise generating the symmetric group of even degree
No full textLet G be the symmetric group of degree n. Let ω(G) be the maximal size of a subset S of G such that 〈x,y〉=G whenever x,y∈S and x≠y and let σ(G) be the minimal size of a family of proper subgroups of G whose union is G. We prove that both functions σ(G) and ω(G) are asymptotically equal to [Formula presented] when n is even. This, together with a result of S. Blackburn, implies that σ(G)/ω(G) tends to 1 as n→∞. Moreover, we give a lower bound of n/5 on ω(G) which is independent of the classification of finite simple groups. We also calculate, for large enough n, the clique number of the graph defined as follows: the vertices are the elements of G and two vertices x,y are connected by an edge if 〈x,y〉≥An.Let G be the symmetric group of degree n. Let omega(G) be the maximal size of a subset S of G such that (x, y) = G whenever x, y E S and x not equal y and let sigma(G) be the minimal size of a family of proper subgroups of G whose union is G. We prove that both functions sigma(G) and omega(G) are asymptotically equal to 1/2(n/n/2) when n is even. This, together with a 2 n/2 result of S. Blackburn, implies that sigma(G)/omega(G) tends to 1 as n ->infinity. Moreover, we give a lower bound of n/5 on omega(G) which is independent of the classification of finite simple groups. We also calculate, for large enough n, the clique number of the graph defined as follows: the vertices are the elements of G and two vertices x, y are connected by an edge if (x, y) >= A(n). (C) 2021 Elsevier B.V. All rights reserved
pH-sensitive fluorescent dye as probe for proton uptake in photosynthetic reaction centers
No full textIsolated and purified reaction centers (RC) from Rhodobacter sphaeroides R-26.1 were solubilised in detergent with excess quinone and external electron donors and illuminated in the presence of pyranine. The pH change accompanying the reaction center photocycle was monitored by recording the variation of the pyranine fluorescence intensity. Using QB-depleted reaction centers or blocking the photocycle with terbutryne strongly reduced the pH change. The usefulness and limits of this technique in monitoring the pH changes during the RC photocycle are also discussed
Internet-based emotional awareness and expression therapy for functional somatic disorders
No full textBackground: Patients with Functional Somatic Disorders (FSD) make up one of the largest and most challenging patient groups in primary care. FSD are characterized by physical symptoms that have a major impact on the person’s life and usually have a chronic course. Somatic and psychiatric comorbidity is common. Few patients with FSD receive adequate care, which can lead to frustration with the healthcare system. Moreover, medical treatment, such as surgery or pharmacological therapy, has at best limited efficacy or at worst iatrogenic effects. Among psychological treatments, cognitive behavioral therapy has been most extensively studied. Research indicates small effect sizes with some effects tending to disappear at follow-up. New psychological treatment avenues are developing in the field, with one of them being the short-term treatment known as Emotional Awareness and Expression Therapy (EAET). EAET is based on a psychodynamically informed treatment model that underlines the importance of emotional processing of stressful life events as one possible vehicle of change in FSD.Aims: The major aim of the thesis was to develop and evaluate an internet-based EAET (I-EAET) for participants with FSD while exploring emotional processing as a potential mediator in I-EAET. Specific aims of Study I were to develop I-EAET and ascertain its feasibility and credibility in patients with FSD. Study II aimed at investigating emotional processing as a potential mediator in I-EAET. The aim of Study III was to do more rigorous testing of I-EAET where participants were randomized to either I-EAET or a wait list control, to investigate if I-EAET was more effective than the control in reducing somatic symptoms. A secondary aim was to study emotional processing as a mediator of treatment effects within the trial. Study IV aimed at describing the implementation of main treatment principles in I-EAET.Methods: Study I was an uncontrolled trial of I-EAET assessing treatment credibility, feasibility, initial efficacy, and possible negative effects with pre-post and 4-month follow-up assessments. Study II encompassed a mediational analysis using linear mixed models to study changes in emotional processing capacity and somatic symptom reduction with data from Study I. Study III was a two-arm randomized controlled trial, comparing 10-week of I-EAET to a wait list control, where the primary outcomes were reductions of somatic symptoms and pain at post-treatment and 4-month follow-up. Moreover, a mediation analysis of emotional processing with depression as a competing mediator was conducted. Study IV was a theoretical review with descriptions of text-based interactions between internet therapists and participants from Study I and III.Results: Study I indicated that I-EAET was feasible, credible, and associated with a decrease in somatic symptoms. Study II showed that facets of improved emotional processing capacity were associated with decreases in somatic symptoms in I-EAET. In Study III, I-EAET decreased somatic symptoms at both post-treatment and 4-month follow-up compared with controls. The effect sizes were small to moderate (d = 0.44 at post-treatment and d = 0.46 at follow-up). Moreover, participants in I-EAET had lower pain intensity at post-treatment (d = 0.36), although the effect did not remain at follow-up. Even when using depression as a competitive mediator, a facet of emotional processing mediated the treatment effect on somatic symptoms. In contrast to previous work on internet-delivered treatments, where text material has been proposed to be the most important treatment mechanism, Study IV described a therapeutic alliance in I-EAET that might foster or hinder emotional processing.Conclusions: I-EAET is a promising treatment for FSD (Studies I–IV). It is feasible, credible, and has acceptable negative effects (Studies I and III). Small to moderate between effect sizes of somatic symptom reduction was demonstrated, both post-treatment and at 4-month follow-up in Study III. The effect of I-EAET was partially mediated by increased emotional processing; when feelings became less intrusive and overwhelming, somatic symptoms tended to reduce (Studies II and III). Important treatment principles of I-EAET include using the therapeutic alliance to foster and deepen emotional processing in treatment (Study IV). Future research should be performed to corroborate these results and compare I-EAET to active treatments, preferably in routine care. Moreover, future research should refine and develop I-EAET further and distinguish and focus on the patients who respond best to I-EAET, to enhance treatment outcomes.List of scientific papersI. Maroti, D., Ek, J., Widlund, R-M., Schubiner, H., Lumley, M. A., Lilliengren, P., Bileviciute-Ljungar, I., Ljotsson, B., & Johansson, R. (2021). Internet-administered emotional awareness and expression therapy for somatic symptom disorder with centralized symptoms: A preliminary efficacy trial. Frontiers in Psychiatry. 12, 620359. https://doi.org/10.3389/fpsyt.2021.620359 II. Maroti, D., Ljótsson, B., Lumley, M. A., Schubiner, H., Hallberg, H., Olsson, P-Å., & Johansson, R. (2021). Emotional processing and its association to somatic symptom change in emotional awareness and expression therapy for somatic symptom disorder: A preliminary mediation investigation. Frontiers in Psychology. 12, 712518. https://doi.org/10.3389/fpsyg.2021.712518 III. Maroti, D., Lumley, M. A., Schubiner, H., Lilliengren, P., Bileviciute-Ljungar, I., Ljótsson, B., & Johansson R. (2022). Internet-based emotional awareness and expression therapy for somatic symptom disorder: A randomized controlled trial. Journal of Psychosomatic Research. 22;163:111068. https://doi.org/10.1016/j.jpsychores.2022.111068 IV. Maroti, D., Hallberg, H., Lindqvist, K., & Mechler, J. (2022). Using psychodynamic principles in guided internet-delivered therapy (IPDT). Psychoanalytic Psychotherapy. 162;1–21. https://doi.org/10.1080/02668734.2022.2124441 </p
Clinical research, photodermatology and pigmentary disorders MAL/PDT vs cryoterapy in primary sbcc: 48 month follow up
No full textReaction centers in lipids
No full textSpecific functional role of physiologically important lipids of the photosynthetic membrane (phosphatidylcholine, cardiolipin and phosphatidylglycerol) was investigated on the thermodynamic and kinetic requirements of the charge movements in bacterial reaction centers. The major effect of these lipids is to increase the stabilization of the separated caharges induced by light excitation during the photosynthetic energy conversion. It can be
achieved by (1) changing the redox midpoint potential of the QA/QA- and QB/QB- redox couples, which results in the increase of the free energy gap that drives the QA– to QB electron
transfer or (2) by changing the quinone binding/unbinding equilibrium. This study provides evidence that from kinetic point of view the P+QA-QB P+QAQB- charge transfer is mainly driven by the change in the enthalpy in LDAO and PC, whereas the entropy contribution is larger if negatively charged lipids are introduced
Configurations of Modified SEPIC Converter with Switched Inductor Module (MSCsI) for Photovoltaic Application: Part-II
No full textThe proposed work is extended configurations of Modified SEPIC Converter (MSC) and Modified SEPIC Converter with Switched Module (MSCSI). The proposed three configurations are derived by replacing two inductor of MSC by two Switched Inductor (SI) modules, namely Modified SEPIC Converter with XYL configuration (MSCSI-XYL), Modified SEPIC Converter with LYZ configuration (MSCSI-LYZ) and Modified SEPIC Converter with XLZ configuration (MSCSI-XLZ) to improve or increase the overall gain of the converter. The key feature of proposed configuration is: (i) single switch topologies, (ii) no reverse current flow from load to source due to large inductor at the input side, (iii) high voltage conversion ratio. The detailed analysis of three configurations is done in terms of component count, voltage conversion ratio and efficiency. The mathematical analysis and simulation results validates the functionality of three configurations
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Bounds for the probability of generating the symmetric and alternating groups
No full textWe give explicit, asymptotically sharp bounds for the probability that a pair of random permutations of degree n generates either Symm(n) or Alt(n) and also for the probability that a pair of even random permutations of degree n generate Alt(n). As an application we answer a question of Wiegold in the case of alternating groups
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
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