bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluation of improved cassava genotypes for yield and related traits for a better breeding strategy under different agroecologies in Nigeria
Authors: Adetoro N. A. , Oworu O. O. , Nassir A. L. , Bello A. , Parkes E. , Ogunbayo S. A. , Akinwale M. G. , Aina O. O. , Afolabi A. , Iluebbey P. , Sanni L. O. , Maziya-Dixon B. , Dixon A. , Kulakow P.
Published: March 2021

This study aimed at determining shoot and root characteristics of cassava as affected by root yield and the influence of soil moisture on vegetative growth and yield. Thirty cassava genotypes were evaluated for morphological and physiological characterization in three locations in Nigeria: Ibadan, Mokwa and Zaria. Randomized complete block design was used with four replicates. Studies on the pasting properties of the genotypes were also carried out. Data were collected on plant height, stem girth, stay-green ability, garri and fresh root weight. Genotypes differed significantly (P < 0.05) across and within locations for shoot and root characteristics. Across locations, genotype 011663 had the highest plant height (132.4 cm); 30572 had the largest stem girth (8.6 cm); and 010040 was the best stay-green (2.2). Genotype 011086 had the highest number of roots per plot (95.7), 950289 had the highest fresh root yield (24.3 t/ha), and 990554 had the highest percentage of dry matter (35.2). Trends in root yields across locations were Ibadan (28.9 t/ha), Mokwa (20.3 t/ha), and Zaria (8 t/ha). Five genotypes IITA-TMS-IBA950289, 010034, 990554, 011807, and 980581 had negligible interactions with the environment and so have broad adaptation and are considered stable; and two clones 011807 and 950166 were found to be the best for pasting properties. Breeding strategies that consider root size, total root number, harvest index, dry matter, with applications for household foods and industrial uses, will be an effective and efficient way to select genotypes for high yield.
In vitro contact guidance of glioblastoma cells on metallic biomaterials
Authors: Uzer-Yilmaz B.
Published: March 2021

Cancer cells’ ability to sense their microenvironment and interpret these signals for the regulation of directional adhesion plays crucial role in cancer invasion. Furthermore, given the established influence of mechanical properties of the substrate on cell behavior, the present study aims to elucidate the relationship between the contact guidance of glioblastoma cell (GBM) and evolution of microstructural and mechanical properties of the implants. SEM analyses of the specimens subjected to 5 and 25% of plastic strains revealed directional groove-like structures in micro and submicro-sizes, respectively. Microscale cytoplasmic protrusions of GBMs showed elongation favored along the grooves created via deformation markings on 5% deformed sample. Whereas filopodia, submicro-sized protrusions facilitating cancer invasion, elongated in the direction perpendicular to the deformation markings on the 25% deformed sample, which might lead to easy and rapid retraction. Furthermore, number of cell attachment was 1.7-fold greater on 25% deformed sample, where these cells showed the greatest cellular aspect ratio. The directional attachment and contact guidance of GBMs was reported for the first time on metallic implants and these findings propose the idea that GBM response could be regulated by controlling the spacing of the deformation markings, namely the degree of plastic deformation. These findings can be applied in the design of cell-instructive implants for therapeutic purposes to suppress cancer dissemination.
A composite scaffold of Wharton’s jelly and chondroitin sulphate loaded with human umbilical cord mesenchymal stem cells repairs articular cartilage defects in rat knee
Authors: Li Zhong , Bi Yikang , Wu Qi , Chen Chao , Zhou Lu , Qi Jianhong , Xie Di , Song Hongqiang , Han Yunning , Qu Pengwei , Zhang Kaihong , Wu Yadi , Yin Qipu
Published: March 2021

To evaluate the performance of a composite scaffold of Wharton’s jelly (WJ) and chondroitin sulfate (CS) and the effect of the composite scaffold loaded with human umbilical cord mesenchymal stem cells (hUCMSCs) in repairing articular cartilage defects, two experiments were carried out. The in vitro experiments involved identification of the hUCMSCs, construction of the biomimetic composite scaffolds by the physical and chemical crosslinking of WJ and CS, and testing of the biomechanical properties of both the composite scaffold and the WJ scaffold. In the in vivo experiments, composite scaffolds loaded with hUCMSCs and WJ scaffolds loaded with hUCMSCs were applied to repair articular cartilage defects in the rat knee. Moreover, their repair effects were evaluated by the unaided eye, histological observations, and the immunogenicity of scaffolds and hUCMSCs. We found that in vitro, the Young’s modulus of the composite scaffold (WJ-CS) was higher than that of the WJ scaffold. In vivo, the composite scaffold loaded with hUCMSCs repaired rat cartilage defects better than did the WJ scaffold loaded with hUCMSCs. Both the scaffold and hUCMSCs showed low immunogenicity. These results demonstrate that the in vitro construction of a human-derived WJ-CS composite scaffold enhances the biomechanical properties of WJ and that the repair of knee cartilage defects in rats is better with the composite scaffold than with the single WJ scaffold if the scaffold is loaded with hUCMSCs.
A Minimal Parameter Set Facilitating Early Decision-making in the Diagnosis of Hemophagocytic Lymphohistiocytosis
Authors: Smits Bas M. , van Montfrans Joris , Merrill Samuel A. , van de Corput Lisette , van Gijn Mariëlle , de Vries Andrica , van den Bos Cor , Abbink Floor , van der Molen Renate G. , Dors Natasja , Lindemans Caroline , Boelens Jaap J. , Nierkens Stefan
Published: March 2021

Hemophagocytic lymphohistiocytosis (HLH) is a life-threatening immune dysregulation syndrome characterized by uncontrolled immune cell activation. Timely diagnosis is important, since early treatment can improve survival rates. However, completing all assessments needed to reach ≥5 positive criteria out of the 8 HLH-2004 criteria can be time consuming and may delay timely initiation of treatment. Hence, we applied a data-driven approach to identify a minimal parameter set for early decision-making towards the initiation of HLH-specific treatment. We retrospectively evaluated 165 patients from five Dutch tertiary hospitals with suspected HLH. Sixteen pHLH (median age 0.5 years) and 70 sHLH patients (median age 8.7 years) were identified using the HLH-2004 criteria. Clustering analysis and multi-receiver operator characteristics were used to identify parameters distinctive of HLH. The presence of either increased ferritin, cytopenia in ≥2 lineages, or splenomegaly distinguished HLH from non-HLH cases with a negative predictive value of 100%. A minimal parameter set consisting of 2 major criteria (phagocytosis and splenomegaly) and 3 minor criteria (cytopenia, increased ferritin, and increased triglycerides/low fibrinogen) predicted HLH with 95% (88–99) sensitivity and 94% (86–98) specificity. This finding was replicated in an independent retrospective validation cohort of 109 US patients (n = 109). By dividing a subset of the HLH-2004 criteria into major and minor criteria, this strategy uses the evaluation of less than 5 criteria to quickly identify patients with HLH. When confirmed in a prospective setting, this approach could be of value for timely diagnosis and treatment of HLH.
Zur Realisierung der standardsprachlichen vokalischen Lautwandelprozesse des Frühneuhochdeutschen im Text der Hermannstädter Protokolle (1560–1565)
Authors: Owsiński Piotr A.
Published: March 2021

The article presents the results of the phonemic-graphemic analysis of the official reports’ entries from the early second half of the 16th century, which come from the town council of Sibiu (Hermannstadt) and the Concilium Transylvania Saxonicum. The reports constitute a part of the first liber civitatis of Sibiu (Hermannstadt). The aim of the paper is to answer the question how far the script fixes the features of the spoken language. Due to the analysis it could be unambiguously proved, the German used in the text corresponds to the level of development of the German language within the periodization of history of the language as it contains the standard Early New High German features as well as the dialectal structures and the sound changes, which are characteristic for the Silesian dialect. The text can therefore be classified as one of the linguistic monuments of the East Central German of Silesian tradition. All the results of the exploration are supported with the appropriate examples.
The Location of Magnetic Reconnection at Earth’s Magnetopause
Authors: Trattner K. J. , Petrinec S. M. , Fuselier S. A.
Published: March 2021

One of the major questions about magnetic reconnection is how specific solar wind and interplanetary magnetic field conditions influence where reconnection occurs at the Earth’s magnetopause. There are two reconnection scenarios discussed in the literature: a) anti-parallel reconnection and b) component reconnection. Early spacecraft observations were limited to the detection of accelerated ion beams in the magnetopause boundary layer to determine the general direction of the reconnection X-line location with respect to the spacecraft. An improved view of the reconnection location at the magnetopause evolved from ionospheric emissions observed by polar-orbiting imagers. These observations and the observations of accelerated ion beams revealed that both scenarios occur at the magnetopause. Improved methodology using the time-of-flight effect of precipitating ions in the cusp regions and the cutoff velocity of the precipitating and mirroring ion populations was used to pinpoint magnetopause reconnection locations for a wide range of solar wind conditions. The results from these methodologies have been used to construct an empirical reconnection X-line model known as the Maximum Magnetic Shear model. Since this model’s inception, several tests have confirmed its validity and have resulted in modifications to the model for certain solar wind conditions. This review article summarizes the observational evidence for the location of magnetic reconnection at the Earth’s magnetopause, emphasizing the properties and efficacy of the Maximum Magnetic Shear Model.
There is no reason to replace the Razor with the Laser
Authors: Thunder Simon
Published: March 2021

In recent times it has become common to encounter philosophers who recommend the replacement of one principle concerning theory choice, Ockham’s Razor, with another: the Laser. Whilst the Razor tells us not to multiply entities beyond necessity, the Laser tells us only to avoid multiplying fundamental entities beyond necessity. There appear to be seven arguments in the literature for the Laser. They divide into three categories: arguments from the nature of non-fundamentality attempt to motivate the Laser by appeal to various observations about what it is to be non-fundamental; arguments from cases describe hypothetical or actual cases, and allege that only the Laser accords with our intuitive judgements about them; and arguments from analogy claim that ontological parsimony is analogous to conceptual economy, and that this analogy recommends the Laser. I provide novel responses to each of the extant arguments for the Laser, and conclude that there is currently no good reason for replacing the Razor with the Laser.
Latency reduction for narrowband URLLC networks: a performance evaluation
Authors: Amjad Zubair , Nsiah Kofi Atta , Hilt Benoît , Lauffenburger Jean-Philippe , Sikora Axel
Published: March 2021

Fifth-generation (5G) cellular mobile networks are expected to support mission-critical low latency applications in addition to mobile broadband services, where fourth-generation (4G) cellular networks are unable to support Ultra-Reliable Low Latency Communication (URLLC). However, it might be interesting to understand which latency requirements can be met with both 4G and 5G networks. In this paper, we discuss (1) the components contributing to the latency of cellular networks and (2) evaluate control-plane and user-plane latencies for current-generation narrowband cellular networks and point out the potential improvements to reduce the latency of these networks, (3) present, implement and evaluate latency reduction techniques for latency-critical applications. The two elements we detected, namely the short transmission time interval and the semi-persistent scheduling are very promising as they allow to shorten the delay to processing received information both into the control and data planes. We then analyze the potential of latency reduction techniques for URLLC applications. To this end, we develop these techniques into the long term evolution (LTE) module of ns-3 simulator and then evaluate the performance of the proposed techniques into two different application fields: industrial automation and intelligent transportation systems. Our detailed evaluation results from simulations indicate that LTE can satisfy the low-latency requirements for a large choice of use cases in each field.
Vaporization of Vanadium Pentoxide from CaO-SiO2-VOx Slags During Alumina Dissolution
Authors: Shyrokykh Tetiana , Wei Xingwen , Seetharaman Seshadri , Volkova Olena
Published: March 2021

The vaporization of vanadium pentoxide from CaO-SiO2-VO
x
ternary slags using different gas treatment regimens and parallel vacuum gas extirpation to treat V-bearing slags at 1873 K has been developed in the present study. The novelty of the present study is to monitor the effect of parallel alumina dissolution on the vaporization phenomenon. Vanadium pentoxide has high vapor pressure at the temperatures over 1500 K. When CaO-SiO2-VO
x
ternary slags, kept in dense alumina crucibles, are injected with oxygen, V2O5 gas bubbles are formed which are forced out by using vacuum extirpation. The vanadium pentoxide could be then collected in the exhaust gases. The mechanism of the process phenomenon is described as the formation of V2O5 gas phase resulting from the oxidation of the lower-valent oxides present in the slag. This gas phase would form microbubbles in the molten slag bulk phase due to low surface tension between the gas phase and the slag, thereby increasing the contact surface. At the same time, the crucible material would dissolve in the slag causing an increase in the slag viscosity. Due to the high slag viscosity of the bulk slag, these microbubbles formed would have difficulty in coalescing and reaching the slag surface. The escaping of the bubbles into the gas phase is enabled by the vacuum extirpation.
Effect of Geometric Parameters and Moisture Content on the Mechanical Performances of 3D-Printed Isogrid Structures in Short Carbon Fiber-Reinforced Polyamide
Authors: Di Pompeo Valerio , Forcellese Archimede , Mancia Tommaso , Simoncini Michela , Vita Alessio
Published: March 2021

The present paper aims at studying the effect of geometric parameters and moisture content on the mechanical performances of 3D-printed isogrid structures in short carbon fiber-reinforced polyamide (namely Carbon PA). Four different geometric isogrid configurations were manufactured, both in the undried and dried condition. The dried isogrid structures were obtained by removing the moisture from the samples through a heating at 120 °C for 4 h. To measure the quantity of removed moisture, samples were weighted before and after the drying process. Tensile tests on standard specimens and buckling tests on isogrid panels were performed. Undried samples were tested immediately after 3D printing. It was observed that the dried samples are characterized by both Young modulus and ultimate tensile strength values higher than those provided by the undried samples. Similar results were obtained by the compression tests since, for a given geometric isogrid configuration, an increase in the maximum load of the dried structure was detected as compared to the undried one. Such discrepancy tends to increase as the structure with the lowest thickness value investigated is considered. Finally, scanning electron microscopy was carried out in order to analyze the fractured samples and to obtain high magnification three-dimensional topography of fractured surfaces after testing.
Beneath the surface: The influence of music and the dark triad traits on stress and performance
Authors: Gomes Arrulo Teresa , Doumas Michail , Papageorgiou Kostas A.
Published: March 2021

Examining factors that protect against the negative repercussions of stress on everyday functioning is paramount. This experimental study investigated the effects of music listening and personality on the reduction of perceived stress and cognitive performance. Seventy adults (18–45 years, M = 22.8, SD = 6.6) completed measures of the Dark Triad traits (psychopathy, narcissism, and Machiavellianism), music preferences, and music uses, and undertook a stress-inducing procedure. Participants were randomly allocated to three groups: hip-hop/rap, classical music, control, being exposed to the respective genre or silence for 20 min after the predicted peak in stress. Results showed that classical and hip-hop/rap music equally facilitated stress reduction. Narcissism predicted lower stress when classical music preference was high. Narcissism also predicted enhanced performance but also greater stress, when paired with infrequent stress-management through music. These novel findings demonstrate how particular genres and traits, despite being predominantly negatively perceived, can enhance stress reduction or cognitive performance.
Molluscan Diversity Influenced by Mangrove Habitat in the Khors of Qatar
Authors: Al-Khayat Jassim A. , Vethamony P. , Nanajkar Mandar
Published: March 2021

The Exclusive Economic Zone (EEZ) of Qatar is a rapidly developing region within the Arabian Gulf, where monitoring of changes in benthic biodiversity and its functioning is needed. The influence of mangroves and seasonality on the nearshore subtidal molluscan diversity at three distinct khors (nearshore tidal bays) – natural mangroves (Al Dhakhira), planted mangroves (Al Mafyar) and no-mangroves (Dawhat Zekreet) – are investigated in this study. This study concludes that even the sub-tidal area is influenced by mangroves, and mangroves increase the diversity of molluscs compared to the site that lacks mangroves. The maximum salinity (59.8 psu) was observed at Dawhat Zekreet during summer, and the minimum (41.44 psu) at Al Dhakhira in winter. Chlorophyll a level was low for all the khors, and rarely exceeded 1 μg/L, depicting oligotrophic waters. Al Dhakhira demonstrated the highest molluscan species richness (32), and shared 28 species in common with Al Mafyar. Dawhat Zekreet had the fewest mollusc species number and no mangroves. When cumulative diversity over all seasons was considered, Dawhat Zekreet exhibited the lowest species richness; Al Dhakhira, the highest. Some mangrove regions have been already utilized for developmental activities, and Qatar needs to continue the program of mangrove conservation as a vital habitat for molluscs.
Revealing the Hierarchical Microstructure of Innovative Additively Manufactured Metal Parts with Conventional Light Microscopy
Authors: Tonelli Lavinia
Published: March 2021

Additively manufactured parts are characterized by a peculiar microstructure, originated by the distinctive layer-by-layer process. In case of additive technology based on the localized melting of a metallic feedstock, as laser-based powder bed fusion (LPBF), the resulting microstructure has a hierarchical arrangement, consisting of macro- and microscopical features affecting the final properties. Commonly, several advanced metallographic techniques are adopted in order to reveal the LPBF microstructure. However, main microstructural features can be also qualitatively appreciated by means of conventional light microscopy. The present work aims at describing how the peculiar LPBF microstructure of the Co28Cr6Mo alloy can be characterized, along with its main microstructural features, by means of the sole light microscopy.
Shift in bacterial etiology from the CAPNETZ cohort in patients with community-acquired pneumonia: data over more than a decade
Authors:   for the CAPNETZ- Study Group, Braeken D. C. W. , Essig A. , Panning M. , Hoerster R. , Nawrocki M. , Dalhoff K. , Suttorp N. , Welte T. , Pletz M. W. , Witzenrath M. , Rohde G. G. U. , Rupp J.
Published: March 2021

To determine the most relevant pathogens for CAP in Germany, patients with radiologically confirmed pulmonary infiltrates and at least one clinical sign of lung infection were prospectively recruited within the CAPNETZ cohort from 2004 until 2016. In 990 out of 4.672 patients (21%) receiving complete diagnostics the most prominent change of pathogens was a decrease of S. pneumoniae (58% in 2004 to 37.5% in 2016; p ≤ 0.001, ρ =  − 0.148) and an increase of H. influenzae (12.2% to 20.8%; p = 0.001, ρ = 0.104).
Two new effective iteration methods for nonlinear systems with complex symmetric Jacobian matrices
Authors: Zhang Lv , Wu Qing-Biao , Chen Min-Hong , Lin Rong-Fei
Published: March 2021

In this paper, we mainly discuss the iterative methods for solving nonlinear systems with complex symmetric Jacobian matrices. By applying an FPAE iteration (a fixed-point iteration adding asymptotical error) as the inner iteration of the Newton method and modified Newton method, we get the so–called Newton-FPAE method and modified Newton-FPAE method. The local and semi-local convergence properties under Lipschitz condition are analyzed. Finally, some numerical examples are given to expound the feasibility and validity of the two new methods by comparing them with some other iterative methods.
Deciduous dentition and dental eruption sequence in Interatheriinae (Notoungulata, Interatheriidae): implications in the systematics of the group
Authors: Fernández Mercedes , Fernicola Juan C. , Cerdeño Esperanza
Published: March 2021

Studies focused on deciduous dentition, ontogenetic series, and tooth eruption and replacement patterns in fossil mammals have lately increased due to the recognized taxonomic and phylogenetic weight of these aspects. A study of the deciduous and permanent dentition of Interatherium and Protypotherium (Interatheriinae) is presented, based mainly on unpublished materials. Deciduous cheek teeth are brachydont and placed covering the apex of the respective permanent tooth; in addition, some morphological and metrical differences are observed along the crown height. Five dental ontogenetic stages are distinguished among the juvenile specimens on the basis of the degree of wear, the replacement of the deciduous premolars, and the eruption of the molars. The crown height and the wear degree of different Interatheriinae taxa show: (1) eruption pattern of molars in an anterior–posterior direction (M/m1 to M/m3); (2) pattern of replacement of deciduous premolars and eruption of permanent premolars in a posterior–anterior direction (dP/dp4 to dP/dp2 and P/p4 to P/p2); and (3) eruption of M/m3 before the replacement of dP/dp4. Results allow evaluating the diagnostic dental characteristics used to describe some interatheriines, as well as reinterpreting some taxonomic assumptions: the holotype of Protypotherium diversidens Ameghino, 1891 is recognized as a juvenile of another species of the genus, and the species is not validated, considering it as Protypotherium sp.; the holotype of Eudiastatus lingulatus Ameghino, 1891 falls in the variability of Protypotherium, becoming P. lingulatus new combination, tentatively maintaining the species and implying the synonymy between Eudiastatus and Protypotherium; and the holotype of Eopachyrucos ranchoverdensis Reguero, Ubilla, and Perea, 2003 is reinterpreted as bearing deciduous premolars.
Limitations on the role of frequency in L2 acquisition
Authors: VON STUTTERHEIM CHRISTIANE , LAMBERT MONIQUE , GERWIEN JOHANNES
Published: March 2021

abstract

In the context of theories of statistical learning, frequency of encounter is viewed as a major driving force in L2 acquisition. The present paper challenges this position with respect to core components at the level of language competence which relate to language-specific patterns in cognitive construal. Empirical evidence from very advanced L2 speakers (L1 French, L2 English and L2 German) shows that forms and constructions which are highly frequent in the target languages in the expression of motion events are not used in a target-like form by L2 speakers. The study shows how the basis for language use which is not target-like lies at the level of event construal: conceptual frames, which are language-specific and are deeply anchored in the course of L1 acquisition, drive allocation of attention and the extraction of forms in L2 acquisition. Findings in the domain of spatial cognition show that motion event frames based on the L1 take precedence over frequency of occurrence of forms in the target language as a factor in L2 use.
A NEW REFINEMENT OF FINE’S PARTITION THEOREM
Authors: KANG JIAYU , LI RUNQIAO , WANG ANDREW Y. Z.
Published: March 2021

We find a new refinement of Fine’s partition theorem on partitions into distinct parts with the minimum part odd. As a consequence, we obtain two companion partition identities. Both analytic and combinatorial proofs are provided.
Whom can a Muslim Woman Represent? Begum Jahanara Shah Nawaz and the politics of party building in late colonial India
Authors: KOUL ASHISH
Published: March 2021

This article argues that gendered ideas about political representation were pivotal to the All-India Muslim League's new self-imagination as the exclusive representative of Indian Muslims after the Pakistan Resolution of March 1940. I offer a gendered reading of League politics during the crucial decade of the 1940s by examining the historical implications of Begum Jahanara Shah Nawaz's expulsion from the party in 1941 for accepting a post on the National Defense Council. When she claimed that she was appointed to the Council as a representative of all Indian women and Punjab, the League leadership condemned her for disobeying the party's resolution to remain aloof from British India's wartime administration. With an unusual intensity, Muhammad Ali Jinnah, the League's president, censured her for endangering Indian Muslims’ fragile unity and asserted that League members could either represent Muslims—or no one. Her arguments functioned as an effective foil against which the League solidified its homogenizing narrative of an Indian Muslim identity and its universalizing project of Pakistan. As the demand for Pakistan increasingly dominated the League's rhetoric, alternative models of representation that drew upon cross-religious, gender-based, or regional solidarities became progressively untenable for female Muslim League politicians. Shah Nawaz's expulsion, and the discourse on representation it generated, demonstrated that gender issues were central to League politics at both the provincial and the all-India level.
The contribution of environmental enteropathy to the global problem of micronutrient deficiency
Authors: Kelly Paul
Published: March 2021

Sometimes referred to as hidden hunger, micronutrient deficiencies persist on a global scale. For some micronutrients this appears to be due to inadequate intake, for others intake may not match increased requirements. However, for most micronutrient deficiencies there is uncertainty as to the dominant driver, and the question about the contribution of malabsorption is open. Environmental enteropathy (EE), formerly referred to as tropical enteropathy and also referred to as environmental enteric dysfunction, is an asymptomatic disorder of small intestinal structure and function which is very highly prevalent in many disadvantaged populations. Recent studies of the pathology and microbiology of this disorder suggest that it is driven by very high pathogen burdens in children and adults living in insanitary environments and is characterised by major derangements of the epithelial cells of the intestinal mucosa. Transcriptomic data suggest that it may lead to impaired digestion and absorption of macronutrients. Given the very high prevalence of EE, marginal malabsorption could have large impacts at population scales. However, the relative contributions of inadequate soil and crop micronutrient contents, inadequate intake, malabsorption and increased requirements are unknown. Malabsorption may compromise attempts to improve micronutrient status, but with the exception of zinc there is currently little evidence to confirm that malabsorption contributes to micronutrient deficiency. Much further research is required to understand the role of malabsorption in hidden hunger, especially in very disadvantaged populations where these deficiencies are most prevalent.
Relationship between changes in the course of COVID-19 and ratio of neutrophils-to-lymphocytes and related parameters in patients with severe vs. common disease
Authors: Wang Kun , Wang Xin , Du Jiangdong , Liu Chunling , Jiang Yanan , Zhang Heqiu , Jiang Haiming , Fu Qiang
Published: March 2021

To assess the relationship between the neutrophil-to-lymphocyte ratio (NLR) and related parameters to the severity of coronavirus disease 2019 (COVID-19) symptoms. Clinical data from 38 COVID-19 patients who were diagnosed, treated and discharged from the Qishan Hospital in Yantai over the period from January to February 2020 were analysed. NLR and procalcitonin (PCT) were determined in the first and fourth weeks after their admission, along with the clinical characteristics and laboratory test results of these patients. Based on results as obtained on the first and fourth weeks after admission, five indices consisting of NLR, white blood cells, neutrophils, lymphocytes (LY) and monocytes (MON) were selected to generate receiver operating characteristic curves, while optimal cutoff values, sensitivities and specificities were obtained according to the Yuden index. Statistically significant differences in neutrophils, LY and the NLR were present in the severe vs. moderate COVID-19 group from the first to the fourth week of their hospitalisation. The cut-off value of NLR for predicting the severity of COVID-19 was 4.425, with a sensitivity of 0.855 and a specificity of 0.979. A statistically significant positive correlation was present between PCT and NLR in the severe group as determined within the first week of admission. NLR can serve as a predictor of COVID-19 disease severity as patients' progress from the first to the fourth week of their hospitalisation. The statistically significant positive correlation between levels of NLR and PCT in severe patients indicated that increases in NLR were accompanied with gradual increases in PCT.
Kant on the Ground of Human Dignity
Authors: Kumar Apaar
Published: March 2021

Kant interpreters have contrasting views on what Kant takes to be the basis for human dignity. Several commentators have argued that human dignity can be traced back to some feature of human beings. Others contend that humans in themselves lack dignity, but dignity can be attributed to them because the moral law demands respect for humanity. I argue, alternatively, that human dignity in Kant’s system can be seen to be grounded in the reciprocal relationship between the dignity of the moral law and the dignity inherent in the human constitution. The latter includes the dignity of personhood, construed as rational inner purposiveness, and the dignity of giving oneself the law and striving to follow it.
IN SEARCH OF A COLOR LINE
Authors: Hunt Larry L.
Published: March 2021

This research examines laws in the colony of Virginia created by a powerful landowning planter class that attempted to draw a color line separating three descent groups: an indigenous native population (Indian), an immigrant population from Europe (English), and an imported population from Africa (Negro). Textual analysis of the Laws of Colonial Virginia shows that the English lawmakers had to learn they were the White component of a color line; they did not, for many years, refer to themselves as White. Contrary to some widely held views that race relations began as soon as these groups came into contact at some point in the seventeenth century, the analysis of written law suggests it took over 100 years, until near the middle third of the eighteenth century in Colonial Virginia, before a definitive concept of race was socially-constructed and a color line was drawn in Black and White.
Molecular and ionised gas kinematics in a sample of nearby active galaxies
Authors: Bianchin Marina , Riffel Rogemar A. , Storchi-Bergmann Thaisa , Riffel Rogério , Schonell Astor J.
Published: March 2021

We used Gemini NIFS integral field spectroscopy to analyse the molecular and ionised gas kinematics of six nearby (z ⩽ 0.015) Seyfert galaxies with a spatial coverage of 0.1 – 0.6 kpc2. By fitting the emission-line profiles using multiple Gaussian components we determined that the ionised and hot molecular gas kinematics are dominated by gas outflows and rotation, respectively, even though three objects also present molecular outflows.
First results of the DIVING3D survey of bright galaxies in the local universe: The mini-DIVING3D sample
Authors: Menezes R. B. , Steiner J. E. , Ricci T. V. , da Silva Patrícia , Nicolazzi D. M.
Published: March 2021

We present the first results of the Deep Integral Field Spectroscopy View of Nuclei of Galaxies (DIVING3D) survey, obtained from the analysis of the nuclear emission-line spectra of a sub-sample we call mini-DIVING3D, including all southern galaxies with B < 11.2 and |b| >15°. In comparison with previous studies, very few galaxies were classified as Transition objects. A possible explanation is that at least part of the Transition objects are composite systems, with a central low-ionization nuclear emission-line region (LINER) contaminated by the emission from circumnuclear H II regions. The high spatial resolution of the DIVING3D survey allowed us to isolate the nuclear emission from circumnuclear contaminations, reducing the number of Transition objects.
Unveiling the afterlife of galaxies with ultraviolet data
Authors: Werle Ariel
Published: March 2021

. Recent works have shown that early-type galaxies (ETGs) are much more complex than early studies suggested. We present early results from a combined analysis of optical spectra and ultraviolet photometry for a sample of 3453 red sequence galaxies in at z < 0.1 that are classified as elliptical by Galaxy Zoo. By measuring the Gini index of the star-formation histories derived by starlight, we investigate the complexity of the mixture of stellar populations required to describe ETGs in our sample. When fitting only optical spectra, starlight assigns more or less the same mixture of stellar populations to all ETGs, while the addition of UV data unveils a bimodallity in the star-formation histories of these galaxies. We find evidence for stellar populations younger than 1 Gyr in 17 per cent of our sample, indicating that some galaxies do not stay permanently quenched after reaching the red sequence.
Modelling the silicate emission features in type 1 AGNs: Dusty torus and disk+outflow models
Authors: Martínez-Paredes M. , Aretxaga I.
Published: March 2021

We investigated how the most common dusty torus models reproduce both the 10 and 18μm silicate emission features observed in the nuclear infrared (IR) Spitzer spectrum of type 1 active galactic nuclei (AGN). We use a sample of type 1 AGN for which the Spitzer spectrum is mostly dominated by the emission of the AGN (>80%), and the 10μm silicate emission feature is prominent (1σSi10μm > 0.28). The models are the smooth dusty torus models from Fritz et al., the clumpy dusty torus models from Nenkova et al. and Hoenig et al., the two-phase media torus model from Stalevski et al., and the disk+outflow model from Hoenig et al. These models differ by assuming either different geometry or dust composition. We found that in general, all models have difficulties reproducing the shape and peak of the silicate emission features, but the disk+outflow model is the best reproducing the AGN-dominated Spitzer spectrum.
Mass outflow of the X-ray emission line gas in NGC 4151
Authors: Kraemer S. B. , Turner T. J. , Crenshaw D. M. , Schmitt H. R. , Revalski M. , Fischer T. C.
Published: March 2021

We have analyzed Chandra/High Energy Transmission Grating spectra of the X-ray emission line gas in the Seyfert galaxy NGC 4151. The zeroth-order spectral images show extended H- and He-like O and Ne, up to a distance r ˜ 200 pc from the nucleus. Using the 1st-order spectra, we measure an average line velocity ˜230 km s–1, suggesting significant outflow of X-ray gas. We generated Cloudy photoionization models to fit the 1st-order spectra; the fit required three distinct emission-line components. To estimate the total mass of ionized gas (M) and the mass outflow rates, we applied the model parameters to fit the zeroth-order emission-line profiles of Ne IX and Ne X. We determined an M ≍ 5.4 × 105Mʘ. Assuming the same kinematic profile as that for the [O III] gas, derived from our analysis of Hubble Space Telescope/Space Telescope Imaging Spectrograph spectra, the peak X-ray mass outflow rate is approximately 1.8 Mʘ yr–1, at r ˜ 150 pc. The total mass and mass outflow rates are similar to those determined using [O III], implying that the X-ray gas is a major outflow component. However, unlike the optical outflows, the X-ray emitting mass outflow rate does not drop off at r > 100pc, which suggests that it may have a greater impact on the host galaxy.
Galactic nuclear off-centerings: the innermost accretion mechanism?
Authors: Gaspar Gaia , Díaz Rubén , Mast Damían , Agüero María P.
Published: March 2021

In the current scenario of galaxy evolution, supermassive black holes (SMBH) are present in almost all galaxies. To trigger nuclear activity, large amounts of material have to fall from kpc to pc and even smaller scales. Hence, an efficient angular momentum removal mechanism is needed. A growing black hole could still not be fixed in the gravitational potential well of the galaxy. This can be observed as a break in the symmetry between the global structure of the galaxy and the central source and could be part of the mechanism that drives material from the last hundred parsecs onto accretion in the SMBH. We present spatial profile decomposition of 16 galaxies observed with GNIRS (Gemini North) in the Klong band. We have been able to measure off-centerings in 3 of 16 galaxies. We found a possible correlation between the presence of an off-centering and the SMBH mass.
Propagation of cosmic rays and their secondaries in the intracluster medium
Authors: Hussain Saqib , Alves Batista Rafael , de Gouveia Dal Pino Elisabete Maria , Dolag Klaus
Published: March 2021

We present results of the propagation of high-energy cosmic rays (CRs) and their secondaries in the intracluster medium (ICM). To this end, we employ three-dimensional cosmological magnetohydrodynamical simulations of the turbulent intergalactic medium to explore the propagation of CRs with energies between 1014 and 1019 eV. We study the interaction of test particles with this environment considering all relevant electromagnetic, photohadronic, photonuclear, and hadronuclear processes. Finally, we discuss the consequences of the confinement of high-energy CRs in clusters for the production of gamma rays and neutrinos.
Testing the link between mergers and AGN in the Arp 245 system
Authors: Lösch Elismar , Ruschel-Dutra Daniel
Published: March 2021

Galaxy mergers are known to drive an inflow of gas towards galactic centers, potentia- lly leading to both star formation and nuclear activity. In this work we aim to study how a major merger event in the ARP 245 system is linked with the triggering of an active galactic nucleus (AGN) in the NGC galaxy 2992. We employed three galaxy collision numerical simulations and calculated the inflow of gas through four different concentric spherical surfaces around the galactic centers, estimating an upper limit for the luminosity of an AGN being fed the amount of gas crossing the innermost spherical surface. We found that these simulations predict reasonable gas inflow rates when compared with the observed AGN luminosity in NGC 2992.
Searching for Ultra-diffuse galaxies in the low-density environment around NGC 3115
Authors: Canossa-Gosteinski Marco , Chies-Santos Ana L. , Furlanetto Cristina , Freitas Rodrigo F. , Schoenell William
Published: March 2021

Ultra-diffuse galaxies (UDGs) are extremely low luminosity galaxies and some of them seem to have a lack of dark matter. Therefore, they can offer important clues to better understand galaxy formation and evolution. Little is known about UDGs in less dense environments, as most of the known UDGs have been found in very dense regions, in the outskirts of massive galaxies in galaxy clusters. In this work, we present the properties of UDGs candidates identified through visual inspection around the low-density environment of NGC 3115, the closest S0 galaxy from the Milky Way. We have measured the structural parameters of 41 UDGs candidates using images obtained with the Dark Energy Camera at the Blanco Telescope. Such structural parameters will be used to characterise and select the best UDG candidates, that will have their properties traced for future follow-up campaigns.
The excitation mechanisms of X-ray oxygen emission-lines
Authors: Reynaldi Victoria , Guainazzi Matteo , Bianchi Stefano , Andruchow Ileana , García Federico , López Iván , Salerno Nicolás
Published: March 2021

We present the Catalogue of High REsolution Spectra of Obscured Sources (CHRESOS) from the XMM-Newton Science Archive. It comprises soft X-ray emission-lines from C to Si and the Fe 3C and Fe 3G L-shell transitions. Here, we concentrate on the oxygen emission-lines O VII(f) and O VIII Lyα to shed light onto the physical processes with which their formation can be related to: active galactic nucleus vs. star-forming regions. We are analysing the relationships between the oxygen lines and the luminosities of: [OIII]λ5007, [OIV]25.89μm, MIR-12μm, FIR-60μm, FIR-100μm, and hard X-rays continuum bands.
The two-phase gas outflow in the Circinus Galaxy
Authors: Fonseca-Faria M. A. , Rodríguez-Ardila A.
Published: March 2021

We employ Multi Unit Spectroscopic Explorer (MUSE) data to study the ionized and very ionized gas phase of the feedback in Circinus, the closest Seyfert 2 galaxy. The analysis of the nebular emission allowed us to detect a remarkable high-ionization gas outflow, out of the galaxy plane, traced by the coronal lines [Fe viii] 6089Å and [Fe x] 6374Å, extending up to 700 parsecs north-west from the nucleus. The gas kinematics reveal expanding gas shells with velocities of a few hundred km s-1, spatially coincident with prominent hard X-ray emission detected by Chandra. Density and temperature sensitive line ratios show that the extended high-ionization gas is characterized by a temperature of up to 18000 K and a gas density of ne > 102 cm−3. We propose two scenarios consistent with the observations to explain the high-ionization component of the outflow: an active galactic nuclei (AGN) ejection that took place ⁓105 yr ago or local gas excitation by shocks produced by the passage of a radio jet.
The relation between the environment and nuclear activity in nearby QSOs: Defining a control sample
Authors: Araujo Bruna L. C. , Storchi-Bergmann Thaisa , Rembold Sandro B.
Published: March 2021

In this study, we aim to investigate the relation between nuclear activity and the environment for luminous (L[O III] >7.63 × 1041 erg s–1) Active Galactic Nuclei (AGN) - that, at these luminosities are classified as quasi-stellar objects (QSOs) - using a sample of 436 type 2 QSOs. Recent studies suggest that there is an excess of interacting hosts in luminous AGN, indicating that interactions trigger the nuclear activity. In order to examine this, it is necessary to select a control sample of non-active galaxies, matched to the active ones by the properties of the host galaxies, such as distance and stellar mass. We present here the results of the search for such a control sample.
Effects of supernovae feedback and black hole outflows in the evolution of Dwarf Spheroidal Galaxies
Authors: Lanfranchi Gustavo Amaral , Caproni Anderson , Soares Jennifer F. , de Oliveira Larissa S.
Published: March 2021

The gas evolution of a typical Dwarf Spheroidal Galaxy is investigated by means of 3D hydrodynamic simulations, taking into account the feedback of type II and Ia supernovae, the outflow of an Intermediate Massive Black Hole (IMBH) and a static cored dark matter potential. When the IMBH’s outflow is simulated in an homogeneous medium a jet structure is created and a small fraction of the gas is pushed away from the galaxy. No jet structure can be seen, however, when the medium is disturbed by supernovae, but gas is still pushed away. In this case, the main driver of the gas removal are the supernovae. The interplay between the stellar feedback and the IMBH’s outflow should be taken into account.
High density galaxy environments — the radio view
Authors: Hardcastle Martin J.
Published: March 2021

Radio-loud active galaxies are widely believed to have a strong impact on their environments, and often lie in groups and clusters of galaxies. In this article I summarize what we can understand about the sources’ effects on their surroundings from the perspective of radio galaxy physics, with special reference to the energetics of the impact on the external medium and its inference from large statistical studies of radio galaxies.
Excitation mechanism in the intracluster filaments surrounding the Brightest Cluster Galaxies
Authors: Polles Fiorella L.
Published: March 2021

Multi-phase filamentary structures surrounding giant elliptical galaxies at the center of cool-core clusters, the Brightest Cluster Galaxies (BCGs), have been detected from optical to submillimeter wavelengths. The source of the ionisation in the filaments is still debated. Studying the excitation of these structures is key to our understanding of Active Galactic Nuclei (AGN) feedback in general, and more precisely of the impact of environmental and local effects on star formation. One possible contributor to the excitation of the filaments is the thermal radiation from the cooling of the hot plasma surrounding the BCGs, the so-called cooling flow.
Stellar populations and ionised gas in central spheroidal galaxies
Authors: Lorenzoni Vanessa , Rembold Sandro B.
Published: March 2021

We investigate the stellar populations and ionised gas properties of a sample of central spheroidal galaxies in order to better constrain their history of star formation and gas excitation mechanism. We select galaxies from Spheroids Panchromatic Investigation in Different Environmental Regions (SPIDER) catalogue and separate these galaxies in different regimes of halo and galaxy mass. To characterise the stellar population properties of these galaxies we use the stellar population synthesis method with the Starlight code, and the presence of ionised gas is identified by measurements of the Hα equivalent width. We analyse how these properties behave as a function of the galaxy stellar mass and the parent halo mass. A trend is observed in the sense of increased ionised gas emission for low-mass centrals in high-mass halos. We interpret this trend in a scenario of intracluster medium (ICM) cooling versus active galactic nuclei (AGN) feedback in a Bondi accretion context.