Miracle-dz/UniFAR-FTUs huggingface dataset:
Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

Co6Al2HT hydrotalcite-like compounds were synthesized by three different methods: co-precipitation, microwaves-assisted and ultrasound-assisted methods. The mixed oxides obtained after calcination were studied by several techniques: XRD, TEM, H2-TPR and XPS. They were also tested as catalysts in the reaction of total oxidation of toluene. The physico-chemical studies revealed a modification of the structural characteristics (surface area, morphology) as well as of the reducibility of the formed mixed oxides. The solid prepared by microwaves-assisted synthesis was the most active. Furthermore, a relationship between the ratio of Co2+ on the surface, the reducibility of the Co-Al mixed oxide and the T50 in toluene oxidation was demonstrated. This suggests a Mars Van Krevelen mechanism for toluene total oxidation on these catalysts.
Partitioning Random Graphs into Monochromatic Components

Erdős, Gyarfas, and Pyber (1991) conjectured that every $r$-colored complete graph can be partitioned into at most $r-1$ monochromatic components; this is a strengthening of a conjecture of Lovasz (1975) in which the components are only required to form a cover. An important partial result of Haxell and Kohayakawa (1995) shows that a partition into $r$ monochromatic components is possible for sufficiently large $r$-colored complete graphs. We start by extending Haxell and Kohayakawa's result to graphs with large minimum degree, then we provide some partial analogs of their result for random graphs. In particular, we show that if $p\ge \left(\frac{27\log n}{n}\right)^{1/3}$, then a.a. s. in every $2$-coloring of $G(n,p)$ there exists a partition into two monochromatic components, and for $r\geq 2$ if $p\ll \left(\frac{r\log n}{n}\right)^{1/r}$, then a.a. s. there exists an $r$-coloring of $G(n,p)$ such that there does not exist a cover with a bounded number of components. Finally, we consider a random graph version of a classic result of Gyarfas (1977) about large monochromatic components in $r$-colored complete graphs. We show that if $p=\frac{\omega(1)}{n}$, then a.a. s. in every $r$-coloring of $G(n,p)$ there exists a monochromatic component of order at least $(1-o(1))\frac{n}{r-1}$.
Seed Supply, Recruitment, and Assembly: Quantifying Relative Seed and Establishment Limitation in a Plant Community Context

There is a growing consensus that the relative constraints of seed limitation and establishment limitation in recruitment strongly influence abundance patterns in plant communities. Although these constraints have direct relevance to coexistence, most investigations utilize a seed addition approach that offers limited insight into these dynamics. Here we report the results of an assembly experiment with annual plant species from California grasslands to examine how propagule pool characteristics (dominant species abundance, functional diversity) influence establishment and seed limitation (density independence and density dependence across a gradient of seed supply) for each species, as well as how these constraints affect community diversity. Species were predominantly colimited by seed and establishment constraints, exhibiting saturating recruitment functions with increased seed supply. Consistent with competition-colonization trade-off predictions, recruitment constraints often depended on the degree of seed limitation of the competitive dominant, Brassica nigra; diversity was greatest in communities where Brassica was seed limited. Functional similarity within the propagule pool did not affect recruitment across a range of seed supply; likewise, functional diversity of the propagule pool was not related to community diversity. We conclude that seed limitation of the dominant species rather than niche similarity influences interspecific competition for safe sites and scales up to affect community-level diversity.
ISO 14001 Environmental Management Systems Certification, Firm Characteristics and Performance of Certified Firms in Nairobi County, Kenya

Rising environmental concerns and stakeholder demands for demonstration of environmental responsibility by firms has culminated in widespread adoption of Environmental Management Systems (EMSs), with the framework based on the ISO 14001 standard being the most popular. One question that has dominated research is how ISO 14001 EMS certification contributes to firm performance. Studies on this question have largely focused on countries outside the African continent and yielded conflicting findings. Consequently, this study investigated the relationship between ISO 14001 EMS Certification and performance of certified firms in Nairobi County, Kenya. Two main research hypotheses were tested. The study applied descriptive, cross sectional research design in a census of 36 firms in Nairobi County, Kenya. Primary data was collected via structured questionnaires and analyzed using descriptive and inferential statistics. The descriptive data indicated general agreement among respondents that implementation of the core ISO 14001 elements in their respective firms satisfied the requirements specified on the questionnaire to a great extent, and that the factors for effective implementation of ISO 14001 were in place in their firms. Firm Performance improvement from ISO 14001 was rated in the range of 10-15%, though with variation in the ratings obtained. Environmental Policy, Planning, and Implementation and Operation have a positive relationship with Firm Performance, although this is not statistically significant for the element of Planning. Checking and Corrective Action and Management Review in turn have a significant, negative relationship with Firm Performance. The moderated regression analysis showed evidence of positive moderation by Firm Characteristics for Environmental Policy, Checking and Corrective Action, and Management Review, but not for Planning and Implementation and Operation; while the strength of the relationship improved by 8.4%. The study recommends that firms be cognisant of the moderating factors affecting successful implementation of EMSs in their respective industry set ups, and critically assess how these can be addressed at firm level, in order to enhance their ability to benefit from adopting EMSs.
Killing A Child: Neuropsychological Profiles of Murderers of Children

This study examined neuropsychological characteristics of offenders who killed children. Although prior studies have focused on filicide and neonaticide, children are killed in a variety of contexts. This study used a diverse sample of individuals (N = 33) accused of killing one or more children, referred for forensic neuropsychological evaluation. Across all cognitive domains (intellectual functioning, attention/working memory/processing speed, memory, reasoning/executive functioning, language), mean scores fell in the low average to average range. Offenders who solely killed children were less likely to do so in a premeditated fashion, were more likely to use manual means (e.g., drowning or beating), and scored lower on measures of language and verbal memory, compared with those who also killed adults as part of the offense. Contrary to prior findings, few gender differences were evident in this group of offenders. Findings highlight meaningful heterogeneity in offenders who kill children, which may inform prevention, treatment, and risk assessment.
Developmental Patterning by Mechanical Signals in Arabidopsis

A central question in developmental biology is whether and how mechanical forces serve as cues for cellular behavior and thereby regulate morphogenesis. We found that morphogenesis at the Arabidopsis shoot apex depends on the microtubule cytoskeleton, which in turn is regulated by mechanical stress. A combination of experiments and modeling shows that a feedback loop encompassing tissue morphology, stress patterns, and microtubule-mediated cellular properties is sufficient to account for the coordinated patterns of microtubule arrays observed in epidermal cells, as well as for patterns of apical morphogenesis.
Antecedents and drivers of IT-business strategic alignment: Empirical validation of a theoretical model

Aligning information technology (IT) strategy with business strategy has been one of the top concerns of practitioners and scholars for decades. Despite the documented positive effects of strategic alignment on organizational success, only a few organizations consider themselves in alignment. Although numerous studies exist about how to accomplish IT-business alignment, empirical studies based on strong theories have been rare in the literature. This study attempts to fulfill this gap by proposing and empirically validating a comprehensive strategic alignment model. Drawing on prior literature, we identified five antecedents of alignment; centralization, formalization, shared domain knowledge, successful IT history and relationship management. We further hypothesized that the effects of these antecedents are mediated by two drivers of alignment, which are conceptualized as the level of connection of IT and business planning and the level of communication between IT and business managers. Using survey data and structural equation modeling methodology, we show that both drivers had significant effects on alignment, and the effect of connection is about twice that of communications. Our findings also confirm the effects of all antecedents except centralization. Overall, the main contribution of this study is the development and empirical validation of a comprehensive strategic alignment model, providing a more ample prescriptive insight for managing IT-business strategic alignment.
Early event-related potential changes during working memory activation predict rapid decline in mild cognitive impairment.

BACKGROUND The conversion of mild cognitive impairment (MCI) to Alzheimer's disease is associated with substantial compromise of neocortical circuits subserving rapid cognitive functions such as working memory. Event-related potential (ERP) analysis is a powerful tool to identify early impairment of these circuits, yet research for an electrophysiological marker of cognitive deterioration in MCI is scarce. Using a "2-back" activation paradigm, we recently described an electrophysiological correlate of working memory activation (positive-negative working memory [PN(wm)] component) over parietal electrodes. METHODS Ours was a longitudinal study of 24 MCI patients with ERP analysis at inclusion and neuropsychological follow-up after 1 year. We used ERP waveform subtraction analysis between the n-back and control tasks. Analysis of variance (ANOVA) was used to compare electroencephalograph latencies between progressive MCI (PMCI) and stable MCI (SMCI), and univariate regression was used to assess the relationship between neuropsychological measures at baseline and clinical outcome. RESULTS Thirteen (54%) MCI patients showed PMCI, and 11 (46%) remained stable (SMCI). In SMCI, a PN(wm) component with significantly larger density compared to baseline was identified when subtracting the detection task for both the 1- and 2-back tasks. In contrast, in PMCI, the PN(wm) component was absent in both 1-back and 2-back conditions. Neuropsychological variables and n-back test performance at inclusion did not predict cognitive deterioration 1 year later. CONCLUSIONS In conjunction with recent functional imaging data, the present results support the notion of an early dysfunction of neural generators within the parietal cortex in MCI. They also reveal that the absence of the PN(wm) component may provide an easily applicable qualitative predictive marker of rapid cognitive deterioration in MCI.
Referential vs. non-referential null subjects in Middle Norwegian

This paper investigates the relationship between referential and non-referential null subjects in Middle Norwegian. It argues that overt, non-referential subject det arose before the loss of referential null subjects, contrary to the predictions of much previous work. A diachronic analysis compatible with the empirical findings is sketched out.
Full Genome Characterization of Human Influenza A/H3N2 Isolates from Asian Countries Reveals a Rare Amantadine Resistance-Conferring Mutation and Novel PB1-F2 Polymorphisms

Influenza A viruses evolve at a high rate requiring continuous monitoring to maintain the efficacy of vaccines and antiviral drugs. We performed next generation sequencing analysis of 100 influenza A/H3N2 isolates collected in four Asian countries (Japan, Lebanon, Myanmar, and Vietnam) during 2012–2015. Phylogenetic analysis revealed several reassortment events leading to the circulation of multiple clades within the same season. This was particularly evident during the 2013 and 2013/2014 seasons. Importantly, our data showed that certain lineages appeared to be fitter and were able to persist into the following season. The majority of A/H3N2 viruses continued to harbor the M2-S31N mutation conferring amantadine-resistance. In addition, an S31D mutation in the M2-protein, conferring a similar level of resistance as the S31N mutation, was detected in three isolates obtained in Japan during the 2014/2015 season. None of the isolates possessed the NA-H274Y mutation conferring oseltamivir-resistance, though a few isolates were found to contain mutations at the catalytic residue 151 (D151A/G/N or V) of the NA protein. These variations did not alter the susceptibility to neuraminidase inhibitors and were not detected in the original clinical specimens, suggesting that they had been acquired during their passage in MDCK cells. Novel polymorphisms were detected in the PB1-F2 open-reading frame resulting in truncations in the protein of 24–34 aminoacids in length. Thus, this study has demonstrated the utility of monitoring the full genome of influenza viruses to allow the detection of the potentially fittest lineages. This enhances our ability to predict the strain(s) most likely to persist into the following seasons and predict the potential degree of vaccine match or mismatch with the seasonal influenza season for that year. This will enable the public health and clinical teams to prepare for any related healthcare burden, depending on whether the vaccine match is predicted to be good or poor for that season.
Applying IRSS Theory: The Clark Atlanta University Exemplar

The percentage of underrepresented minorities (African-American, Hispanic, Native Americans) that have obtained graduate level degrees within computing disciplines (computer science, computer information systems, computer engineering, and information technology) is dismal at best. Despite the fact that academia, the computing workforce, professional associations, and scientific societies have identified procedures, models, and best practices in an attempt to increase the number of individuals within these underrepresented communities, the number of minorities receiving MS and PhDs in these fields have only increased marginally. In this article, we discuss how Boice’s four-part IRSS model (i.e., Involvement, Regimen, Self-Management, and Social Networks) combined with effective mentoring models as introduced in Payton et al., is a promising framework for addressing the longstanding issue of underrepresented minorities in management education, which tends to mirror findings in science, technology, engineering, and mathematics disciplines. The focus of this article is to illustrate the application of these theories at the undergraduate level by discussing two precollege/early college/scholarship programs implemented at Clark Atlanta University (CAU). These CAU programs provide the field with an exemplar which can serve as a foundational example for institutions seeking to foster, retain and graduate underrepresented minorities in higher education management disciplines, in general, and offer lessons learned from historically black colleges and universities, in particular. Using a “360-degree mentoring” model to supplement the IRSS framework, our study concludes with implications for future research regarding how academic institutions can create, foster and sustain programs for effective recruitment, retention, and training of underrepresented minorities. Subject Areas: Computing Disciplines, HBCUs, Management Education, Mentoring, Recruitment, Retention, and Underrepresented Minorities.
Association between Usual Sodium and Potassium Intake and Blood Pressure and Hypertension among U.S. Adults: NHANES 2005–2010

Objectives Studies indicate high sodium and low potassium intake can increase blood pressure suggesting the ratio of sodium-to-potassium may be informative. Yet, limited studies examine the association of the sodium-to-potassium ratio with blood pressure and hypertension. Methods We analyzed data on 10,563 participants aged ≥20 years in the 2005–2010 National Health and Nutrition Examination Survey who were neither taking anti-hypertensive medication nor on a low sodium diet. We used measurement error models to estimate usual intakes, multivariable linear regression to assess their associations with blood pressure, and logistic regression to assess their associations with hypertension. Results The average usual intakes of sodium, potassium and sodium-to-potassium ratio were 3,569 mg/d, 2,745 mg/d, and 1.41, respectively. All three measures were significantly associated with systolic blood pressure, with an increase of 1.04 mmHg (95% CI, 0.27–1.82) and a decrease of 1.24 mmHg (95% CI, 0.31–2.70) per 1,000 mg/d increase in sodium or potassium intake, respectively, and an increase of 1.05 mmHg (95% CI, 0.12–1.98) per 0.5 unit increase in sodium-to-potassium ratio. The adjusted odds ratios for hypertension were 1.40 (95% CI, 1.07–1.83), 0.72 (95% CI, 0.53–0.97) and 1.30 (95% CI, 1.05–1.61), respectively, comparing the highest and lowest quartiles of usual intake of sodium, potassium or sodium-to-potassium ratio. Conclusions Our results provide population-based evidence that concurrent higher sodium and lower potassium consumption are associated with hypertension.
Structural requirements regulate endoproteolytic release of the L- selectin (CD62L) adhesion receptor from the cell surface of leukocytes

L-selectin mediates leukocyte rolling on vascular endothelium at sites of inflammation and lymphocyte migration to peripheral lymph nodes. L- selectin is rapidly shed from the cell surface after leukocyte activation by a proteolytic mechanism that cleaves the receptor in a membrane proximal extracellular region. This process may allow rapid leukocyte detachment from the endothelial surface before entry into tissues. In this study, the structural requirements for regulation of human L-selectin endoproteolytic release were examined through analysis of chimeric selectin molecules and mutant L-selectin receptors. The use of chimeric selectins and a cytoplasmic tail truncation mutant demonstrated that the extracellular membrane-proximal 15-amino acid region of L-selectin is required for endoproteolytic release. The introduction of alanine-scanning mutations within this membrane- proximal region did not prevent endoproteolytic release, indicating that a specific amino acid motif was not an absolute requirement for cleavage. Furthermore, alterations within the putative primary cleavage site (K283-S284) resulted in either constitutive endoproteolytic release of the receptor or inhibition of cell activation-induced shedding to variable extents. The length of the membrane-proximal region was also critical since truncations of this region completely abolished endoproteolytic release. Thus, release of L-selectin is likely to be regulated by the generation of an appropriate tertiary conformation within the membrane-proximal region of the receptor which allows recognition by a membrane-bound endoprotease with relaxed sequence specificity that cleaves the receptor at a specific distance from the plasma membrane. These observations suggest a generalized protein-processing pathway involved in the endoproteolytic release of specific transmembrane proteins which harbor widely differing primary sequences at or neighboring their cleavage sites.
Journal of Economic Behavior & Organization Exploring Gendered Behavior in the Field with Experiments: Why Public Goods Are Provided by Women in a Nairobi Slum

Women, and particularly women in all-female groups, appear to be especially adept at providing public goods in developing countries. We use a one-shot Public Goods game to explore the effect of sex and a group's sex composition on the voluntary provision of public goods in a Nairobi slum. Sex heterogeneity hurts the voluntary provision of public goods because women—but not men—contribute less in mixed-sex than same-sex groups. Women contribute as much as men in same-sex groups. This result is driven by women's pessimism and men's optimism about others' contributions in mixed-sex groups rather than by gendered social preferences.
Adult-onset autosomal recessive ataxia with thalamic lesions in a Finnish family

Objective: To describe an unusual kindred with adult-onset ataxia and thalamic lesions detected by brain MRI. Methods: The authors characterized clinical, laboratory, and pathologic features of the disease and sought linkage to previously recognized ataxia loci. Results: Two sisters and a brother developed progressive ataxia, dysarthria, mild cognitive impairment, and sensorimotor neuropathy at age 30, combined with epilepsy in one sibling. MRI showed symmetric thalamic lesions, changes in brainstem gray matter, and white matter changes in the cerebellum. Autopsy in one of the patients revealed neuronal degeneration with a peculiar vacuolar change in thalamus, probably representing transsynaptic degeneration in response to deafferentation. Neuronal and secondary tract degeneration was observed in the spinal cord, cerebellum, and brainstem suggesting a spinocerebellar degeneration. The disorder appears to be transmitted as an autosomal recessive trait. Genetic and sequence analysis of the FRDA gene and comprehensive laboratory examinations excluded Friedreich’s ataxia and other similar recessive diseases. Conclusion: Adult-onset recessive ataxia with bilateral thalamic lesions in this family may represent a distinct hereditary spinocerebellar ataxia.
Outlier detection for skewed data

Most outlier detection rules for multivariate data are based on the assumption of elliptical symmetry of the underlying distribution. We propose an outlier detection method which does not need the assumption of symmetry and does not rely on visual inspection. Our method is a generalization of the Stahel–Donoho outlyingness. The latter approach assigns to each observation a measure of outlyingness, which is obtained by projection pursuit techniques that only use univariate robust measures of location and scale. To allow skewness in the data, we adjust this measure of outlyingness by using a robust measure of skewness as well. The observations corresponding to an outlying value of the adjusted outlyingness (AO) are then considered as outliers. For bivariate data, our approach leads to two graphical representations. The first one is a contour plot of the AO values. We also construct an extension of the boxplot for bivariate data, in the spirit of the bagplot 1 which is based on the concept of half space depth. We illustrate our outlier detection method on several simulated and real data. Copyright © 2008 John Wiley & Sons, Ltd.