bluuebunny/crossref_metadata_2025 huggingface dataset:
Microwave‐Assisted Solvothermal One‐Pot Synthesis of RuO2 Nanoparticles: First Insights of Its Activity Towards Oxygen and Chlorine Evolution Reactions
Authors: Palma‐Goyes Ricardo E. , Vazquez‐Arenas Jorge , Romero‐Ibarra Issis C. , Ostos Carlos
Published: December 2018

A microwave‐assisted solvothermal method is proposed as a rapid and low‐cost fabrication procedure of RuO2 nanoparticles using citric acid as stabilizing agent in ethylene glycol, and H2O2 as oxidizing agent at 180 °C. Structural and morphological characterizations of the powder are investigated using X‐Ray diffraction (XRD), scanning electronic microscopy (SEM) and transmission electron microscopy (TEM). XRD analysis shows that there is a synergic effect to obtain RuO2 nanoparticles when 6% v/v H2O2 is added followed by a calcination of the powder, due to reactive oxygen intermediates (1O2, HO−2, HO•2, •OH) generated in the first stage. TEM and SEM images of as‐synthesized material exhibit an uniform particle distribution (PSD) of RuO2 nanoparticles with averaged diameter of ca. 38 nm, and its indexing indicates the RuO2 stoichiometry with high degree of crystallinity. The preliminary electrocatalytic performance of RuO2 nanoparticles coated on Ti is investigated using voltammetry and electrochemical impedance spectroscopy (EIS), towards the oxygen (OER) and chlorine evolution reaction (CER) in 1 mol L−1 H2SO4 and 0.1 mol L−1 NaCl, respectively. Cyclic voltammograms of RuO2 display typical behaviors for OER and CER at 1.25 and 1.1 V vs Ag/AgCl, respectively. A Tafel slope of 44 mV dec−1 corrected for ohmic drop was obtained in sulfate media which confirmed the OER mechanism in the absence of chlorides; while this parameter is around 25 mV dec−1 in NaCl (CER), strongly depending on the chloride concentration and the extent of OER input. In NaCl media, the energy barriers represented by the charge transfer resistances for CER are overcome at more positive potentials than for OER, and a greater activity of the O2 evolution is observed as the potential became more positive.
Paracrine Factors Released by Osteoblasts Provide Strong Platelet Engraftment Properties
Authors: Abu-Khader Ahmad , Law Kyle W. , Jahan Suria , Manesia Javed K. , Pasha Roya , Hovey Owen , Pineault Nicolas
Published: December 2018

Ex vivo expansion of hematopoietic stem cell (HSCs) and progenitors may one day overcome the slow platelet engraftment kinetics associated with umbilical cord blood transplantation. Serum-free medium conditioned with osteoblasts (i.e., osteoblast-conditioned medium [OCM]) derived from mesenchymal stromal cells (MSC) was previously shown to increase cell growth and raise the levels of human platelets in mice transplanted with OCM-expanded progenitors. Herein, we characterized the cellular and molecular mechanisms responsible for these osteoblast-derived properties. Limiting dilution transplantation assays revealed that osteoblasts secrete soluble factors that synergize with exogenously added cytokines to promote the production of progenitors with short-term platelet engraftment activities, and to a lesser extent with long-term platelet engraftment activities. OCM also modulated the expression repertoire of cell-surface receptors implicated in the trafficking of HSC and progenitors to the bone marrow. Furthermore, OCM contains growth factors with prosurvival and proliferation activities that synergized with stem cell factor. Insulin-like growth factor (IGF)-2 was found to be present at higher levels in OCM than in control medium conditioned with MSC. Inhibition of the IGF-1 receptor, which conveys IGF-2′ intracellular signaling, largely abolished the growth-promoting activity of OCM on immature CD34+ subsets and progenitors in OCM cultures. Finally, IGF-1R effects appear to be mediated in part by the coactivator β-catenin. In summary, these results provide new insights into the paracrine regulatory activities of osteoblasts on HSC, and how these can be used to modulate the engraftment properties of human HSC and progenitors expanded in culture. Stem Cells  2019;37:345–356
Cardiotoxicity and myocardial infarction‐associated DNA damage induced by thiamethoxam in vitro and in vivo: Protective role of Trigonella foenum‐graecum seed‐derived polysaccharide
Authors: Feki Amal , Ben Saad Hajer , Bkhairia Intidhar , Ktari Naourez , Naifar Manel , Boudawara Ons , Droguet Mickaël , Magné Christian , Nasri Moncef , Ben Amara Ibtissem
Published: December 2018

The risk of pesticides on the human health and environment has drawn increasing attention. Today, new tools are developed to reduce pesticide adverse effects. This study aimed to evaluate the toxicity induced by, thiamethoxam (TMX), and the cytoprotective effect of a novel polysaccharide, named fenugreek seed water polysaccharide (FWEP) in vitro using H9c2 cardiomyoblastes and in vivo using Wistar rat model. Animals were assigned into four groups per eight rats each: group 1 served as a control group, group 2 received TMX, group 3, and group 4 received both FWEP and TMX tested at two doses (100 and 200 mg/kg, respectively). Regarding the in vitro study, our results demonstrated that TMX induced a decrease in H9c2 cell viability up to 70% with the highest concentration. In vivo, TMX injection induced marked heart damage noted by a significant increase in plasma lactate dehydrogenase, creatine phosphokinase, troponin‐T, aspartate amino transferase activities, cholesterol, and triglyceride levels. Concomitant alterations in cardiac antioxidant defense system revealed depletion in the levels of glutathione and non‐protein thiol and an increase in the activity of superoxide dismutase, catalase, and glutathione peroxidase. Similarly, a significant increase in heart lipid, malondialdehyde, advanced oxidation protein product and in protein carbonyls levels was also noted. In addition, heart tissues histo‐architecture displayed major presence of apoptosis and necrosis as confirmed by DNA degradation. However, supplementation with FWEP alleviated heart oxidative damage and genotoxicity. In this manner, ABTS radical‐scavenging activity, linoleic acid oxidation tests and heart genomic and DNA nicking assay had proved FWEP strong antioxidant potential. In conclusion, FWEP provided significant protection against TMX‐induced heart injury, and could be a useful and efficient agent against cardiotoxicity and atherosclerosis.
Phytol ameliorated benzo(a)pyrene induced lung carcinogenesis in Swiss albino mice via inhibition of oxidative stress and apoptosis
Authors: Sakthivel Ravi , Sheeja Malar Dicson , Archunan Govindaraju , Pandima Devi Kasi
Published: December 2018

In the present study, the modulatory effect of phytol against benzo(a)pyrene [B(a)P] induced lung carcinogenesis was investigated in Swiss albino mice. During the experimental period, phytol treatment showed no adverse toxic effect and mortality to the experimental animals. Lung tumor was observed in B(a)P treated group and also in animals post‐treated with low concentration (50 mg/kg) of phytol. No neoplastic changes were observed in the lung tissue of the animals treated with the maximum dose of phytol (100 mg/kg). An elevated level of antioxidant enzymes combined with macromolecular damage (lipid peroxidation, protein carbonyl content) was observed upon B(a)P treatment whereas, phytol restored the level of antioxidant enzymes which were comparable to the vehicle control group. Moreover, administration of B(a)P induced apoptosis, as observed by the highest expression of Bax, caspase‐3, and caspase‐9 proteins in lung tissue of B(a)P alone treated animals. However, phytol treatment reduced the expression of Bax, caspase‐3, and caspase‐9 protein and maintained the constant expression of anti‐apoptotic protein Bcl‐2. These observations positively reveal that phytol regulates the antioxidant enzymes and thereby protects the cells against B(a)P induced carcinogenesis without showing any adverse toxic effect to the animals.
Surgical Resection for Recurrent Intrahepatic Cholangiocarcinoma
Authors: Bartsch Fabian , Paschold Markus , Baumgart Janine , Hoppe‐Lotichius Maria , Heinrich Stefan , Lang Hauke
Published: December 2018

Background

Although after R0 resection of intrahepatic cholangiocarcinoma (ICC) recurrence is frequent, most guidelines do not address strategies for this. The aim of this study was to analyze the outcome of repeated resection and to determine criteria when repeated resection is reasonable.

Methods

Between 2008 and 2016, we consecutively collected all cases of ICC (n = 176) in a prospective database and further analyzed them with a focus on tumor recurrence, its surgical treatment, overall survival and recurrence‐free survival.

Results

Overall, a total of 22 explorations were performed for recurrent ICC in 17 patients. Resection rate was 18 repeated resections in 13 patients. Three patients underwent repeated resection twice and one patient three times. Recurrence was solitary in 7 patients and multifocal in 11 re‐resected cases. Median overall survival (OS) of patients who underwent repeated resection was 65.2 months (interquartile range 37–126.5) with a 5‐year OS rate of 62%, calculated from primary resection. Patients who underwent repeated resections had a significant better OS compared to those receiving chemotherapy, transarterial chemoembolization, selective internal radiotherapy, radiofrequency ablation or best supportive care (p < 0.001).

Conclusion

Repeated resection of recurrent ICC is reasonable and associated with an improved survival. Re‐exploration should be considered as long as resection is technically possible.
Welfare States
Authors: Lindert Peter H.
Published: December 2018

The traditionally, and wrongly, imagined vulnerabilities of the welfare state are economic. The true threats are demographic and political.

The most frequently imagined threat is that the welfare state package reduces the level and growth of GDP. It does not, according to broad historical patterns and non-experimental panel econometrics. Large-budget welfare states achieve a host of social improvements without any clear loss of GDP. This Element elaborates on how this “free lunch” is gained in practice.

Other threats to the welfare state are more real, however. One is the rise of anti-immigrant backlash. If combined with heavy refugee inflows, this could destroy future public support for universalist welfare state programs, even though they seem to remain economically sound. The other is that population aging poses a serious problem for financing old age. Pension deficits threaten to crowd out more productive social spending. Only a few countries have faced this issue well.
Motivated reasoning when assessing the effects of refugee intake
Authors: LIND THÉRÈSE , ERLANDSSON ARVID , VÄSTFJÄLL DANIEL , TINGHÖG GUSTAV
Published: December 2018

Do differences in worldview ideology hinder people from objectively interpreting the effect of immigration? In an experiment with Swedish adults (n= 1015), we investigate whether people display motivated reasoning when interpreting numerical information about the effects of refugee intake on crime rate. Our results show clear evidence of motivated reasoning along the lines of worldview ideology (i.e., whether people identify themselves primarily as nationally oriented or globally oriented). In scenarios where refugee intake was associated with higher crime rate, nationally oriented people were 18 percentage points more likely to make the correct assessment compared to globally oriented people. Likewise, in scenarios where refugee intake was associated with lower crime rate, nationally oriented people were 20 percentage points less likely to make the correct assessment compared to globally oriented people. Individuals with higher numeric ability were less likely to engage in motivated reasoning, suggesting that motivated reasoning more commonly is driven by feelings and emotional cues rather than deliberate analytical processes.
EPISTEMIC INTERNALISM AND TESTIMONIAL JUSTIFICATION
Authors: Egeland Jonathan
Published: December 2018

According to epistemic internalists, facts about justification supervene upon one's internal reasons for believing certain propositions. Epistemic externalists, on the other hand, deny this. More specifically, externalists think that the supervenience base of justification isn't exhausted by one's internal reasons for believing certain propositions. In the last decade, the internalism–externalism debate has made its mark on the epistemology of testimony. The proponent of internalism about the epistemology of testimony claims that a hearer's testimonial justification for believing that p supervenes upon his internal reasons for thinking that the speaker's testimony that p is true. Recently, however, several objections have been raised against this view. In this paper, I present an argument providing intuitive support for internalism about the epistemology of testimony. Moreover, I also defend the argument against three recent objections offered by Stephen Wright in a couple of recent papers. The upshot of my discussion is that external conditions do make an epistemic difference when it comes to our testimonial beliefs, but that they cannot make any difference with respect to their justificatory status – i.e., they are justificationally irrelevant.
Long-Term Prospects of the International Wine Trade
Authors: Bargain Olivier , Cardebat Jean-Marie , Chiappini Raphael , Laffitte Corentin
Published: December 2018

This article discusses key comparative advantages of wine-producing nations and suggest prospective views on their evolution. Our methodology is twofold. First, we study comparative advantages in 16 countries using Porter's diamond. Then, we report results from a survey in which wine economists are asked to assess the future trade performance of these countries. Results are relatively consistent across methods regarding the future “heavy weights” like China, but also New Zealand and Chile, countries show the greatest potential to succeed in the future global wine trade. It is also expected that Georgia, the United Kingdom, and Australia play an important role, although to a lesser extent. Our findings indicate that comparative advantages in wine trade are neither uniform nor static; especially, terroir is no longer sufficient. The diamond approach contradicts experts from two countries in particular, France and Argentina, suggesting that experts put great emphasis on demand and market structures as key trade determinants for the future. (JEL Classifications: F14, Q17)
Vietnamese Media Going Social: Connectivism, Collectivism, and Conservatism
Authors: Nguyen-Thu Giang
Published: December 2018

June 2018 was an intense time in Vietnam when one saw the role of social media in revealing and facilitating the (dis)congruity between connectivism, collectivism, and conservatism. On June 12, the National Assembly of Vietnam passed the controversial Cybersecurity Law by a landslide of 86 percent agreement despite widespread public dissent, including an online petition signed by more than sixty-five thousand people. The new Cybersecurity Law was said to further restrict the already limited freedom of expression in Vietnam and grant too much power to the police in surveying and punishing online citizens.
Watchdog Journalism in Japan Rebounds but Still Compromised
Authors: Kingston Jeff
Published: December 2018

Prime Minister Shinzo Abe's troubles in 2018 owe much to Japan's resilient liberal media. Between 2011 and 2017, the media was mostly on its back foot, losing credibility over its initial coverage about the Fukushima nuclear accident and withstanding heavy-handed efforts by Abe's government to pressure and intimidate the media into self-censorship (Kingston 2018a). Since early 2017, however, the liberal Asahi newspaper led the way in exposing two cronyism scandals involving private-school projects linked to Abe. It also exposed a series of cases revolving around information disclosure practices that revealed a culture of deception aimed at avoiding government accountability. These included a cover-up at the Defense Ministry regarding a Peace Keeping Operation (PKO) in South Sudan that violated legal constraints imposed by the Diet, and revelations about doctored data used to support Abe's proposed labor reforms. In these and other cases, the government's lack of transparency and mishandling of documents drew sharp public criticism. The press played its role of informing the public about these apparent transgressions while highlighting the arrogance of power that has undermined public trust in Abe; 80 percent do not believe his self-exonerating explanations about the cronyism scandals (Bloomberg 2018). Nonetheless, in September 2018 he won reelection to a third term as Liberal Democratic Party (LDP) president and is set to become Japan's longest serving prime minister. Popular support, however, is tepid, as monthly polls since 2013 by Japan's national broadcasting organization (NHK) indicate that about 50 percent of the public supports him due to a lack of alternatives rather than his virtues as a leader (about 15 percent) or the appeal of his policies (about 15 percent). Despite mixed reviews in the press, he has won a series of elections, and in politics that is what counts (Kingston 2018b).
Platform Patrol: China, the United States, and the Global Battle for Data Security
Authors: Kokas Aynne
Published: December 2018

In Apple CEO Tim Cook's keynote speech at the Chinese government's 2017 World Internet Conference, he extolled the values of “Privacy. Security. Decency” (Apple Newsroom 2017). The last two terms, “security” and “decency,” have long been closely associated with Chinese government efforts to control the Internet. Indeed, in 2017 Apple agreed to turn over user data to Chinese government servers and start a Chinese provincial government-run data storage center. Yet in 2015, Apple refused to turn over the passcode for one user in the United States during the FBI investigation following the San Bernardino terrorist attacks. The company's different policies in the United States and China relate directly back to Apple's concern for market share and access.
Thermal effects on IgM-milk fat globule-mediated agglutination
Authors: Hansen Steffen F. , Larsen Lotte B. , Wiking Lars
Published: December 2018

The process of agglutination causes firm cream layers in bovine milk, and a functioning agglutination mechanism is paramount to the quality of non-homogenized milks. The phenomenon is not well-described, but it is believed to occur due to interactions between immunoglobulins (Ig) and milk fat globules. For the first time, this paper demonstrates how the process of agglutination can be visualized using confocal laser scanning microscopy, rhodamine red and a fluoresceinisothiocynat-conjugated immunoglobulin M antibody. The method was used to illustrate the effect on agglutination of storage temperature and pasteurization temperature. Storage at 5 °C resulted in clearly visible agglutination which, however, was markedly reduced at 15 °C. Increasing storage temperature to 20 or 37 °C cancelled any detectable interaction between IgM and milk fat globules, whereby the occurrence of cold agglutination was documented. Increasing 20 s pasteurization temperatures from 69 °C to 71 °C and further to 73 °C lead to progressively higher inactivation of IgM and, hence, reduction of agglutination. Furthermore, 2-dimensional sodium dodecyl sulfate polyacrylamide gel electrophoresis showed that changes in storage temperature caused a redistribution of Ig-related proteins in milk fat globule membrane isolates. Poly-immunoglobulin G receptor was present in milk fat globule preparations stored at cold (4 °C) conditions, but absent at storage at higher temperature (25 °C). The findings provide valuable knowledge to dairy producers of non-homogenized milk in deciding the right pasteurization temperature to retain the crucial agglutination mechanism.
The dynamics of individual whey protein concentrations in cows’ mammary secretions during the colostral and early lactation periods
Authors: Raimondo Raquel F.S. , Ferrão Juliana S.P. , Miyashiro Samantha I. , Ferreira Priscila T. , Saut João Paulo E. , Birgel Daniela B. , Birgel Junior Eduardo H.
Published: December 2018

The bovine whey consists of more than 200 different types of proteins, of which β-lactoglobulin, α-lactalbumin, serum albumin, immunoglobulins and lactoferrin predominate. However, their concentrations are not stable due to the existence of protein dynamics during a transition from colostrum secretion to mature milk. To evaluate the dynamics of whey proteins of Jersey cows during a colostral phase and first month of lactation and an influence of the number of lactations, 268 milk samples from 135 Jersey cows were selected through a clinical evaluation. Whey was obtained by rennet coagulation of the mammary secretion. The concentration of total proteins was determined by the biuret method and their fractions were identified by 12% dodecyl sulfate-polyacrylamide gel electrophoresis (12% SDS-PAGE). Maximum concentrations of all protein fractions were observed in the first 12 h of lactation, reducing over the course of the study. Modification of the protein predominance was also observed. The transition from colostrum secretion to milk occurred between 24 and 72 h postpartum. There was an influence of the number of lactations on the dynamics of whey proteins, indicating that multiparous cows had better immunological and nutritional quality when compared to primiparous cows.
Appropriate selection indices for functional traits in dairy cattle breeding schemes
Authors: Chegini Arash , Ghavi Hossein-Zadeh Navid , Hosseini Moghaddam Seyed Hossein , Shadparvar Abdol Ahad
Published: December 2018

The objective of this study was to establish different single or multiple trait selection indices to calculate genetic and economic gains by combining some production, reproduction and udder health traits in a population similar to the overall practical situation in Iran, with and without imposing restrictions on genetic change for some traits. The SelAction software was used to perform the analyses based on selection index theory through a deterministic model. Results indicated that among established indices, the index that showed the highest genetic gain for milk yield did not maximize the total genetic and economic gains. Rather, the index that included all production, reproduction and udder health traits yielded the highest genetic and economic gains. When we placed restriction on the selection indices, the economic gain decreased and the amount of reduction depended on the heritability and the correlation of restricted trait(s) with other traits. Generally, regarding the economic genetic gain per generation, the indices based on records of 200 offspring were 4.819% more efficient than those that used information of 100 offspring.
Simple advecting structures and the edge of chaos in subcritical tokamak plasmas
Authors: McMillan Ben F. , Pringle Chris C. T. , Teaca Bogdan
Published: December 2018

In tokamak plasmas, sheared flows perpendicular to the driving temperature gradients can strongly stabilise linear modes. While the system is linearly stable, regimes with persistent nonlinear turbulence may develop, i.e. the system is subcritical. A perturbation with small but finite amplitude may be sufficient to push the plasma into a regime where nonlinear effects are dominant and thus allow sustained turbulence. The minimum threshold for nonlinear instability to be triggered provides a criterion for assessing whether a tokamak is likely to stay in the quiescent (laminar) regime. At the critical amplitude, instead of transitioning to the turbulent regime or decaying to a laminar state, the trajectory will map out the edge of chaos. Surprisingly, a quasi-travelling-wave solution is found as an attractor on this edge manifold. This simple advecting solution is qualitatively similar to, but simpler than, the avalanche-like bursts seen in earlier turbulent simulations and provides an insight into how turbulence is sustained in subcritical plasma systems. For large flow shearing rate, the system is only convectively unstable, and given a localised initial perturbation, will eventually return to a laminar state at a fixed spatial location.
A meta-analysis of neuropsychological, social cognitive, and olfactory functioning in the behavioral and language variants of frontotemporal dementia
Authors: Kamath Vidyulata , Chaney Grace-Anna S. , DeRight Jonathan , Onyike Chiadi U.
Published: December 2018

Background

Though meta-analyses of neuropsychological and social cognitive deficits in behavioral variant frontotemporal dementia (bvFTD) have been conducted, no study has comprehensively characterized and compared the neuropsychological, social cognitive, and olfactory profiles in the behavioral and language variants of FTD.

Methods

Our search yielded 470 publications meeting inclusion criteria representing 11 782 FTD patients and 19 451 controls. For each domain, we calculated Hedges’ g effect sizes, which represent the mean difference between the patient and control group divided by the pooled standard deviation. The heterogeneity of these effects was assessed with Cochran's Q-statistic using a random-effects model. Meta-regressions were employed to analyze the influence of demographic and disease characteristics.

Results

Though semantic variant primary progressive aphasia patients showed the greatest impairment across all task types, the three groups showed similar cognitive effect sizes once contributions from the language subdomain were excluded from analysis. Contrary to expectation, the magnitude of deficits in executive functioning, social cognition and olfaction were comparable between the three subgroups. Among indices, a metric of executive errors distinguished the behavioral variant of FTD from the language phenotypes.

Conclusions

These data indicate that social cognitive and traditional executive functioning measures may not capture differences between FTD syndromes. These results have important implications for the interpretation of neuropsychological assessments, particularly when applied to the differential diagnosis of FTD. It is hoped that these findings will guide clinical and research assessments and spur new studies focused on improving the measurement of FTD syndromes.
Receipt of emotional support among rural South African adults
Authors: Jennings Elyse A. , Mkhwanazi Nolwazi , Berkman Lisa
Published: December 2018

As the world undergoes rapid ageing, informal support from friends and relatives is becoming especially important among older adults in middle- and low-income countries, where formalised social protections may be limited. We use new data from a cohort of adults aged 40 and older in rural South Africa to explore how receipt of emotional support differs by gender and marital status. Our findings suggest that women are more likely to get emotional support than men and have more sources of support. Moreover, women are more likely to get emotional support from relatives, whereas men are more likely to get support from friends. In regard to marital status, married people are more likely to get emotional support and have more sources of support than people who are not married. However, separated/divorced and widowed people are more likely to get emotional support from relatives and have more sources of non-spousal support than married people. These findings point towards gaps in informal systems of support, and the particular importance of considering men and unmarried (especially never-married) people when designing policies to offer social protections to older populations.
Multiple Burials in Ancient Societies: Theory and Methods from Egyptian Archaeology
Authors: Miniaci Gianluca
Published: December 2018

The paper aims at providing theoretical models and data interpretation applied to multiple burials. Challenging the current fuzzy definition of multiple burials in ancient societies, the paper proposes a more accurate classification of multiple burials, with particular reference to ancient Egypt funerary culture, based on two main parameters, which may have influenced the association of bodies: p1) architecture; p2) time span, and three flexible sub-parameters that may be used to customize different scenarios, on occasion: sp1) number of deceased; sp2) age of deceased; sp3) nature of death/deposition. The body has been often considered the real ontological centre of the burial itself with all of the other countable objects intended as radiating projections supporting the body-nucleus. The practice of multiple burials disrupts such a perception as it juxtaposes horizontal, multidirectional perspectives: the role of a new body entering among older bodies and objects, and of the multiple bodies and objects themselves. The study of multiple burials, if correctly framed, can lead to insights into different religious, social, and economic reasons behind the mortuary programmes within a society. For instance, sequential multiple burials reinforce the transformation of dead bodies into part of the burial equipment itself, reducing the centrality of the body and disrupting the narrative tied to individual biographies, increasing an ‘artefactual’ perception.
Revisiting the Dead: Tomb Reuse and Post-Burial Practices at Ascoli Satriano (Pre-Roman Apulia, Seventh–Fourth Centurybc)
Authors: Hoernes Matthias , Heitz Christian , Laimer Manuele
Published: December 2018

In the archaeology of death and burial, the premise that the dead were buried ritually and not simply disposed of seems to be accepted without argument. Where graves were reopened and reused for subsequent burials, however, the post-funeral manipulation of ‘older’ depositions is often regarded as having been primarily pragmatic and circumstantial. Countering this interpretative imbalance, we argue that the reuse of tombs was a highly complex procedure that forced communities into negotiating and formalizing, or even ritualizing, the way in which bodies and objects were acted on and engaged with. Taking the necropolis Giarnera Piccola/Ascoli Satriano in pre-Roman northern Apulia as a case study, and employing a microarchaeological-archaeothanatological perspective, we discuss the diverse and sometimes conflicting practices used to deal with pre-existing graves, objects and human remains, identifying tensions between maintaining or reconstructing the integrity of the body and intentionally manipulating and fragmenting it. We argue that repeatedly reused tombs constituted a socially and symbolically charged arena for a prolonged, active relationship with the deceased and for mobilizing, mediating and maintaining inter-generational memories.
Cognition: From Capuchin Rock Pounding to Lomekwian Flake Production
Authors: Lombard Marlize , Högberg Anders , Haidle Miriam N.
Published: December 2018

Although it is sometimes suggested that modern-day chimpanzee nut-cracking behaviour is cognitively similar to early stone-tool-knapping behaviour, few systematic comparative studies have tested this assumption. Recently, two further techno-behaviours were reported that could both represent intermediary phases in hominin cognitive evolution pertaining to our ultimate technological astuteness. These behaviours are that of bearded capuchin monkeys pounding rocks and very early stone-tool knapping from Lomekwi 3. Here we use a multi-model approach to directly compare cognitive aspects required for 11 techno-behaviours, ranging from the simplest capuchin pounding behaviour to the most complex chimpanzee nut-cracking and Lomekwi 3 knapping behaviours. We demonstrate a marked difference in broad-spectrum cognitive requirements between capuchin pounding on the one hand and Lomekwian bipolar knapping on the other. Whereas the contrast is less pronounced between chimpanzee nut-cracking scenarios and basic passive-hammer knapping at Lomekwi 3, the escalation in cognitive requirement between nut cracking and bipolar knapping is a good indication that early hominin flaking techniques are cognitively more taxing than chimpanzee nut-cracking behaviour today.
Visceral adiposity index is a better predictor of unhealthy metabolic phenotype than traditional adiposity measures: results from a population-based study
Authors: Ferreira Fabrícia Geralda , Juvanhol Leidjaira Lopes , da Silva Danielle Cristina Guimarães , Longo Giana Zarbato
Published: December 2018

Objective

The present study aimed to investigate whether the visceral adiposity index (VAI) is an effective predictor to identify unhealthy metabolic phenotype by comparing normal-weight and overweight individuals.

Design

A population-based cross-sectional study. Data were collected by interviews, anthropometric evaluation, dietetic, clinical and laboratory tests. The area under the receiver-operating characteristic curve (AUC) and prevalence ratio (PR), obtained from Poisson regression, were used to compare the predictive capacity of the obesity indicators evaluated (VAI, BMI, waist and neck circumference, waist-to-height and waist-to-hip ratios) and their association with the unhealthy metabolic phenotype. All analyses were stratified by sex and by nutritional status.

Setting

Viçosa, Minas Gerais, Brazil.

Participants

A total of 854 Brazilian adults (20–59 years old) of both sexes.

Results

VAI was the best predictor for unhealthy metabolic phenotype among men (AUC = 0·865) and women (AUC = 0·843) at normal weight. VAI also had the best predictive capacity among overweight women (AUC = 0·903). Among overweight men, its accuracy (AUC = 0·830) was higher than that of waist-to-hip ratio. In the adjusted regression models, VAI was the indicator most strongly associated with the unhealthy metabolic phenotype, especially among those with normal weight (PR = 6·74; 95 % CI 3·15, 14·42 for men; PR = 7·14; 95 % CI 3·79, 13·44 for women).

Conclusions

VAI has better predictive capacity in detecting unhealthy metabolic phenotype than conventional anthropometric indicators, regardless of nutritional status and sex.
Increased copper levels inhibit denitrification in urban soils
Authors: LI Shun , YANG Xiaoru , BUCHNER Daniel , WANG Haitao , XU Huijuan , HADERLEIN Stefan B. , ZHU Yongguan
Published: December 2018

The consequences of urbanisation for Earth's biogeochemical cycles are largely unexplored. Copper (Cu) in urban soils is being accumulated mainly due to anthropogenic activities under rapid urbanisation. The increasing Cu concentrations may contribute to altering soil nitrogen (N) cycling in urban ecosystems through modulating denitrification processes. This research aims to identify how Cu impacts urban soil denitrification functions and denitrifier abundance. An urban park soil with a background total Cu concentration of 7.9μgg–1 was incubated anaerobically with different Cu amendments (10, 20, 40, 80 and 160μg Cu g–1 soil), similar to prevalent Cu contents in urban soils. We evaluated the soil denitrification functions using the acetylene (C2H2) inhibition method and assessed the denitrifier abundance by quantitative polymerase chain reaction (qPCR) analyses of denitrifying marker genes (nirK, nirS and nosZ). At the function level, we observed that both the potential soil denitrification activity and the N2O emission rate due to denitrification were significantly (P<0.05) inhibited by Cu; even the lowest Cu addition (10μg Cu g–1 soil) drastically affected the denitrification function. Moreover, Cu significantly (P<0.05) decreased the abundance of nirK and nirS genes at the additions of 160μg Cu g–1 soil and 40μg Cu g–1 soil, respectively, whereas it had no clear impact on nosZ gene copies. Further correlation analyses revealed that the potential denitrification activity was positively correlated to the copy numbers of nirK and nirS genes, but it was not correlated to nosZ gene abundance. These findings indicate that Cu additions inhibited soil denitrification function and decreased denitrifier abundance in the investigated urban park soil. Our results suggest that Cu accumulation in urban soils, resulting from urbanisation, may generally influence denitrification in urban ecosystems.
Quality over Quantity: A Lineage-Survival Strategy of Elite Families in Premodern Korea
Authors: Lee Sangkuk , Park Jong Hee
Published: December 2018

In this article, we study social mobility across multiple generations in premodern Korea. Using two extant oldest family records, jokbo, we construct a prospective genealogical microdata containing the entire records of public offices and reproduction over five generations of the two elite family lineages in premodern Korea. We argue that the confluence of an ambiguous stratification system with a limited number of high-ranking offices generated a trade-off for parents between the quantity and quality of positions attained by their offspring. The result of the trade-off was unequal distributions of mobility-related family resources to maximize the lineage’s collective goal, rather than to maximize individual children’s social ranks. Using a novel empirical strategy to consider the heterogeneous resource-allocation within elite families, we present empirical evidence on associations between parents’ and grandparents’ social ranks and quality of offices achieved by children of elite Korean families.
Beweggründe für die Identifikation mit einer Fördermaßnahme im Fußball bei Nachwuchsspielerinnen
Authors: Reinders Heinz , Hoos Olaf , Haubenthal Gernot , Varlemann Stefanie
Published: December 2018

Zusammenfassung. Der vorliegende Beitrag erörtert die Rolle von leistungsbezogenen und sozialen Beweggründen von Nachwuchsspielerinnen im Fußball für die Identifikation mit einer Fördermaßnahme. Dieses Wissen wird für eine optimierte Talentförderung aufgrund sinkender Teilnahmezahlen im Juniorinnenfußball notwendig. Auf Basis der Stage-Environment-Fit-Theorie wird argumentiert, dass neben leistungsbezogenen vor allem soziale Beweggründe die Identifikation mit der Fördermaßnahme und mittelbar die Zielfokussierung der Nachwuchsspielerinnen beeinflussen. Diese Zielfokussierung wiederum wird in positivem Zusammenhang zu den fußballerischen Kompetenzen der Spielerinnen stehen. Die Ergebnisse bei N = 379 Nachwuchsspielerinnen (MAlter = 13.39; SDAlter = 2.07) replizieren zum einen frühere Befunde zum Zusammenhang von Identifikation, Zielfokussierung und fußballerischen Fertigkeiten. Zum anderen zeigen die Ergebnisse einen bedeutsamen Einfluss der sozialen Beweggründe auf die Identifikation mit der Förderumwelt und der Entwicklung ihrer fußballerischen Kompetenzen. Die Befunde werden vor dem Hintergrund möglicher Unterschiede zu Förderbedingungen im Jungenfußball diskutiert.
Stress Triggering of the 2005 Eruption of Sierra Negra Volcano, Galápagos
Authors: Gregg P. M. , Le Mével H. , Zhan Y. , Dufek J. , Geist D. , Chadwick W. W.
Published: December 2018

Extensive vertical deformation (>4.5 m) observed at Sierra Negra volcano Galápagos, Ecuador, between 1992 and the 2005 eruption led scientists to hypothesize that repeated faulting events relieved magma chamber overpressure and prevented eruption. To better understand the catalyst of the 2005 eruption, thermomechanical models are used to track the stress state and stability of the magma storage system during the 1992–2005 inflation events. Numerical experiments indicate that the host rock surrounding the Sierra Negra reservoir remained in compression with minimal changes in overpressure (~10 MPa) leading up to the 2005 eruption. The lack of tensile failure and minimal overpressure accumulation likely inhibited dike initiation and accommodated the significant inflation without the need for pressure relief through shallow trapdoor faulting events. The models indicate that static stress transfer due to the Mw 5.4 earthquake 3 hr prior to the eruption most likely triggered tensile failure and catalyzed the 2005 eruption.
Iron Isotope Systematics of the Panzhihua Mafic Layered Intrusion Associated With Giant Fe‐Ti Oxide Deposit in the Emeishan Large Igneous Province, SW China
Authors: Cao Yonghua , Wang Christina Yan , Huang Fang , Zhang Zhaofeng
Published: December 2018

In order to investigate how Fe was enriched from parental high‐Ti basaltic magma to form the stratigraphically thick Fe‐Ti oxide ore at the bottom layers, we present a systematic study for Fe isotopic compositions of whole rocks and mineral separates (clinopyroxene, magnetite, and ilmenite) throughout the Panzhihua intrusion. Whole rock δ56Fe ranges from 0 ± 0.02‰ to 0.15 ± 0.04‰, consistent with the range of clinopyroxene (0.01 ± 0.02‰ to 0.16 ± 0.05‰). On the contrary, magnetite (Mt) separates have δ56Fe ranging from 0.17 ± 0.05‰ to 0.62 ± 0.02‰, showing a strikingly complementary trend with coexisting ilmenite (Ilm) separates (−0.52 ± 0.03‰ to −0.09 ± 0.02‰) along the profile. The calculated bulk δ56Fe of Fe‐Ti oxides (Mt + Ilm), however, has a small range from 0.01‰ to 0.16‰, identical to those for clinopyroxene separates and whole rocks. The uniform δ56Fe of clinopyroxene may have resulted from the small Fe isotope fractionation between clinopyroxene and parental magma in early‐stage magma differentiation before substantial crystallization of Fe‐Ti oxides. The complementary trends of δ56Fe for Mt and Ilm along the profile and the uniform bulk δ56Fe of Fe‐Ti oxides are better interpreted as in situ crystallization of Fe‐Ti oxides from the interstitial liquid. Our Fe isotopic data and petrographic observations indicate that the thick Fe‐Ti oxide ore layers in the lower zone of the Panzhihua intrusion may be attributed to in situ crystallization of Mt and Ilm from the interstitial, immiscible Fe‐rich melt in the lower part of the magma chamber.
Assessing Superspheroids in Modeling the Scattering Matrices of Dust Aerosols
Authors: Lin Wushao , Bi Lei , Dubovik Oleg
Published: December 2018

Atmospheric dust particles are known to have diverse and irregular morphologies. In order to account for nonsphericity, the spheroidal model with an aspect ratio distribution has been extensively used for modeling the optical properties of dust. The spheroidal model is superior to the spherical shape assumption, but it requires further improvement. In this study, superspheroids' modeling capabilities were systematically examined by comprehensively comparing the spheroid's and superspheroid's scattering matrices. Superspheroids have one more degree of freedom than spheroids and can be nonspherical at an aspect ratio of unity. The invariant imbedding T‐matrix and the improved geometrical optics methods were employed to compute superspheroids' single‐scattering properties with a wide distribution of aspect ratios and a number of roundness parameters. We then assessed the spheroidal and superspheroidal models' applicability for simulating the scattering matrices of 25 dust samples from the Amsterdam‐Granada Light Scattering Database. It was found that extreme aspect ratios for spheroids in reproducing the measurements were unnecessary if superspheroids were used. Even with equi‐probable aspect ratio distribution, superspheroids with constrained roundness parameters (from 2.4 to 3.0) could achieve better performances in concurrently matching six nonzero scattering matrix elements from the laboratory measurements. Moreover, superspheroids demonstrated better performances than spheroids in achieving spectral consistency for modeling dust scattering matrices. Therefore, superspheroids appear to be highly promising for atmospheric radiative transfer and remote sensing applications.
Analytical Solution for Anomalous Diffusion of Bedload Tracers Gradually Undergoing Burial
Authors: Wu Zi , Foufoula‐Georgiou Efi , Parker Gary , Singh Arvind , Fu Xudong , Wang Guangqian
Published: December 2018

Accounting for the burial of tracer particles during bedload transport is an important component in the formulation of tracer dispersal in rivers. Herein we propose a modified active layer formulation, which accounts for the effect of burial and admits analytical solutions, enabling insightful exploration of the phenomenon of superdiffusion of bedload tracers at the intermediate timescale. This phenomenon has been observed in recent numerical results using the 2‐D Exner‐Based Master Equation. By assuming that tracers in the active layer can exchange with nontracer particles in the substrate layer to preserve mass, and that tracers entering the substrate layer get permanently trapped during the timescale of analysis, we are able to deduce governing equations for the tracer concentration in both layers. The active layer tracer concentration is shown to be governed by an advection‐diffusion equation with a sink term, and the increase of tracers in the substrate layer is driven by a corresponding source term. The solution for the variance of tracer population is analytically determined and can be approximated by the sum of a diffusion‐induced scaling (∝t1) and an advection‐induced scaling (∝t3) terms at the intermediate timescale, which explains the phenomenon of superdiffusion. The proposed formulation is shown to be able to capture the key characteristics of tracer transport as inferred by comparison with available results of numerical simulations.
Comparison of Soil Organic Matter Transformation Processes in Different Alpine Ecosystems in the Qinghai‐Tibet Plateau
Authors: Chen Qiuyu , Lei Tianzhu , Wu Yingqin , Si Guicai , Xi Chuanwu , Zhang Gengxin
Published: December 2018

Soils in the Qinghai‐Tibet Plateau are young in terms of development and form a thin, skeletal soil layer because the gravel parent materials are glaciofluvial deposit, eluvium, and fluvial sediment, which are extremely sensitive to global climate change. The lack of understanding of soil organic matter (SOM) transformation processes in this region hinders the prediction of SOM stocks under future climate conditions. In this study, SOM transformation processes were investigated by density groupings and pyrolysis‐gas chromatography/tandem‐mass spectrometry (Py‐GC–MS/MS) in five alpine ecosystems: alpine desert, alpine grassland, alpine meadow, alpine wetland, and alpine forest. The roles of microbial community in different density fractions were elucidated. Soil samples were separated into three fractions with NaI solution: labile fraction (FL; ρ ≤ 1.6 g/cm3), moderate fraction (FM; 1.6 < ρ < 2.25 g/cm3), and recalcitrant fraction (FR; ρ ≥ 2.25 g/cm3). The following results were obtained. (1) The ratios of different fractions (FM/FL, FR/FM, and FR/FL) indicated the transformation processes of SOM, and ratios less than 1 represented degradation. The transformation processes were similar in alpine grassland and meadow and were similar in alpine desert, wetland, and forest but differed from each other. (2) Fungi preferred to degrade plant detritus, which mainly affected FL, whereas bacteria chiefly affected FM. (3) Precipitation altered vegetation type and soil pH, thus affecting communities and microorganism activities and resulting in the above differences. These findings highlight the importance of understanding the limited transformation processes of SOM in ecosystems to predict the impact of climate change on SOM preservation.