Shifts In Structure Research Articles

Widespread cultural change in declining populations of Amazon parrots.

Species worldwide are experiencing anthropogenic environmental change, and the long-term impacts on animal cultural traditions such as vocal dialects are often unknown. Our prior studies of the yellow-naped amazon (Amazona auropalliata) revealed stable vocal dialects over an 11-year period (1994-2005), with modest shifts in geographic boundaries and acoustic structure of contact calls. Here, we examined whether yellow-naped amazons maintained stable dialects over the subsequent 11-year time span from 2005 to 2016, culminating in 22 years of study. Over this same period, this species suffered a dramatic decrease in population size that prompted two successive uplists in IUCN status, from vulnerable to critically endangered. In this most recent 11-year time span, we found evidence of geographic shifts in call types, manifesting in more bilingual sites and introgression across the formerly distinct North-South acoustic boundary. We also found greater evidence of acoustic drift, in the form of new emerging call types and greater acoustic variation overall. These results suggest cultural traditions such as dialects may change in response to demographic and environmental conditions, with broad implications for threatened species.

Enhancing the Goos-Hänchen and spin-Hall shifts in planar and spherical structures through complex-frequency excitations

Enhancing the Goos-Hänchen and spin-Hall shifts in planar and spherical structures through complex-frequency excitations

Spartina alterniflora invasion reduces soil microbial diversity and weakens soil microbial inter-species relationships in coastal wetlands.

Soil microorganisms play a crucial role in the plant invasion process, acting as both drivers of and responders to plant invasion. However, the effects of plant invasion on the complexity and stability of co-occurrence networks of soil microbial communities remain unclear. Here, we investigated how the invasion of Spartina alterniflora affected the diversity, composition, and co-occurrence networks of soil bacterial and fungal communities in the Yellow River Delta, China. Compared to the native plant (Suaeda salsa), S. alterniflora invasion decreased the α-diversity of soil bacterial communities but did not affect that of fungal communities. The β-diversity of soil bacterial and fungal communities under S. salsa and S. alterniflora habitats also differed dramatically. S. alterniflora invasion increased the relative abundance of the copiotrophic phylum Bacteroidota, whereas decreased the relative abundances of the oligotrophic phyla Acidobacteriota and Gemmatimonadota. Additionally, the relative abundance of Chytridiomycota, known for its role in degrading recalcitrant organic matter, increased substantially within the soil fungal community. Functional predictions revealed that S. alterniflora invasion increased the relative abundance of certain soil bacteria involved in carbon and nitrogen cycling, including aerobic chemoheterotrophy, nitrate reduction, and nitrate respiration. More importantly, S. alterniflora invasion reduced the complexity and stability of both soil bacterial and fungal community networks. The shifts in soil microbial community structure and diversity were mainly induced by soil available nutrients and soil salinity. Overall, our study highlights the profound impacts of S. alterniflora invasion on soil microbial communities, which could further indicate the modification of ecosystem functioning by invasive species.

EFFECTIVE TEACHING-LEARNING STRATEGIES FOR SECONDARY LEVEL SCIENCE EDUCATION

Science Education at the secondary level holds paramount importance as it serves as the foundation for further scientific pursuits. The efficacy of secondary level science education significantly impacts a students inclination towards higher studies and eventual contribution to scientific and technological advancements. In order to enhance the effectiveness of secondary level science education, it is imperative to explore innovative teaching-learning strategies that transcend traditional lecture-based methods. Research and surveys consistently advocate for activity-based learning approaches over conventional lecture methods, citing their ability to foster deeper understanding and retention among learners. Practical work emerges as a cornerstone of this approach, offering hands-on engagement and experiential learning opportunities. With the recent shift in the academic structure as per the National Education Policy of 2020 (N.E.P-2020), extending the secondary level from grades 9 to 12, there lies a crucial window for students to immerse themselves in scientific exploration and discovery.Subjects such as Physics, Chemistry, and Biology inherently lend themselves to practical applications, presenting ample opportunities for students to engage directly with scientific concepts. By integrating practical work into the curriculum, secondary level science education can cultivate critical thinking, problem-solving skills, and a deeper appreciation for the scientific method. This shift towards practical-based learning not only aligns with contemporary pedagogical trends but also serves as a catalyst for nurturing the next generation of innovators and scientists.

Sustainable soil rehabilitation with multiple network structures of layered double hydroxide beads: Immobilization of heavy metals, fertilizer release, and water retention

The remediation of heavy metal-contaminated soils necessitated a holistic approach that encompassed water and fertilizer conservation alongside soil property restoration. This study introduced the synthesis of (poly)acrylamide-layered double hydroxide gel spheres (PAM-LDH beads), which were designed to simultaneously immobilize heavy metals, control the release of fertilizers, and enhance soil water retention. Laboratory soil experiments under diverse conditions highlighted the superior performance of PAM-LDH beads in the immobilization of hexavalent chromium (Cr(VI)). The layered double hydroxide (LDH) component was identified as the key player in Cr(VI) immobilization, with anion exchange being the predominant mechanism. Notably, the encapsulated urea within the beads was released independently of environmental influences, governed by a concentration gradient across the beads surface. This release process was characterized by an initial phase of absorptive swelling followed by a diffusive phase. The impact on plant growth was assessed, revealing that PAM-LDH beads significantly curtailed Cr(VI) accumulation and alleviated its phytotoxic effects. Changes in the carbon (C) and nitrogen (N) content of the plants suggested that the urea encapsulated within the beads served as a nutrient source, contributing to soil fertility. Moreover, the water-holding capacity and soil-water characteristic curves of PAM-LDH beads suggested that these superabsorbent beads could delay soil water evaporation. The observed shifts in microbial community structure provided evidence for the enhancement of soil carbon and nitrogen cycles, indicative of improved soil properties.

Determination of Surface Abundances for HD 129174 (π 1 Boo)

The synthesis of the Hg ii line at 3983.93 Å, using published hyperfine structure and nuclear shifts, confirms a large overabundance of mercury in HD 129174, about +6.18 dex, which is actually slightly larger than the excess derived in earlier studies. The synthesis of 17 other lines close to the Hg ii line and in the spectral range 4400–4500 Å yields abundances for 9 elements. Helium and iron are found to be deficient by −1.12 and −0.097 dex. Magnesium, scandium, titanium, chromium are moderately enhanced by respectively +0.30 dex (Mg) and +1.0 dex (Sc, Ti and Cr). Yttrium and zirconium are very overabundant by +4.00, +2.48 dex respectively.

When Monopsony Power Wanes

Abstract In this Part 2, Subjective Agency, I delve into the evolving power and agency of workers as structural conditions undergo transformation. Part 1 described how the law of competition propels firms towards centralisation, gradually diminishing the monopsony power wielded by global buyers in labour-intensive sectors. While manufacturers gain more power and significance, capable of undermining workers’ power, they also become susceptible to disruption. This section introduces the concept of Degree of Spatial Inflexibility (dsi). It posits that as a manufacturer’s monopoly power increases, the monopsony power in the supply chain decreases. However, this elevated monopoly power simultaneously establishes a higher dsi, amplifying the potential for worker disruption. It is essential to recognise that structural power shifts do not guarantee automatic benefits for workers; instead, they necessitate workers to capitalise on these vulnerabilities. This establishes a dialectical relationship between the evolving conditions of capital outlined in Part 1 and the subjective agency of workers, as detailed in Part 2 below.

Translation of Outdoor Signs in Nusa Dua Beach Area

This research was conducted to have a closer look at Linguistic Landscape in one of coastal areas of Bali, Indonesia. It specifically conducted with the aim of analyzing the translation of outdoor signs, in the form of notice or information boards. This research also examines translation shifts occur within those outdoor signs. This research is a qualitative descriptive study. The method applied for this research is observation method and include image capture and also note-taking technique. The problem formulated in this research applies Linguistic Landscape theory by Landry and Bourhis and also Translation Shift theory by Catford and Simatupang. The result of the research found that the form of translation of the outdoor signs in Nusa Dua beach area can be seen in the form of Notice board, cemented sign, or colored banner which has function to give information or warning to the people who visit the area. It also can be found that the shift occurs in the translation of the outdoor signs consists of structure and meaning shift.

Seasonal response of soil microbial community structure and life history strategies to winter snow cover change in a temperate forest

Snow cover provides a thermally stable and humid soil environment and thereby regulates soil microbial communities and biogeochemical cycling. A warmer world with large reductions in snow cover and earlier spring snowmelt may disrupt this stability and associated ecosystem functioning. Yet, little is known about the response of soil microbial communities to decreased snowpack and potential carry-over effects beyond the snow cover period. Herein, we tested this response by conducting a snowpack manipulation experiment (control, addition, and removal) in a temperate forest. Our results showed that fungi were more sensitive to changes in snowpack. Thicker snowpack increased the diversity of fungi, but had weak effects on the diversity of bacteria in winter. Thickening snow cover promoted the ratio of fungi to bacteria abundance across the year, and such relative increase in fungi abundance was largely driven by Basidiomycota phyla (Agaricomycetes class). Increased snowpack decreased soil nitrate concentration, and produced carry-over biogeochemical effects evidenced by increased summer β-1,4-glucosidase and N-acetyl-β-glucosaminidase activities. On a seasonal scale, microbial biomass peaked at both winter and summer; winter microbial community was fungi dominated, while bacteria dominated in summer. The abundances of bacterial phyla had greater seasonal variation than fungal phyla. Specifically, Actinobacteria had greater dominance in winter than in summer, while Acidobacteria, Proteobacteria, and Verrucomicrobia had greater abundance in summer than in winter. Microbial high yield-resource acquisition-stress tolerance life history strategies showed significant seasonal tradeoffs, i.e., resource acquisition and stress tolerance strategies dominated in summer, while high yield strategy dominated in winter. Overall, our findings underline that climate-induced reductions in snow cover can disrupt soil biogeochemical cycling also beyond the snow cover period due to shifts in soil microbial community structure and life history strategies.

Functional Oil Price Expectations Shocks and Inflation

ABSTRACTThis paper investigates the inflation effects of oil price expectations shocks constructed as functional shocks, that is, as shifts in the entire oil futures term structure (both standard and risk‐adjusted). The latter are then included in a vector autoregressive model with exogenous variables (VARX) to examine the US case. Counterfactual analysis is also carried out to investigate second‐round effects on inflation through the inflation expectations channel. These are found to be significant, in contrast to earlier studies based on standard oil price shocks. Additional nonlinear local projections including a shock decomposition exercise show that inflation and inflation expectations are primarily driven by changes in the curvature (level and slope) factor when the latter are anchored (unanchored). These findings provide useful information to policymakers concerning the impact of oil price expectations on inflation and inflation expectations.

Resolving abrupt frontal gradients in zooplankton community composition and marine snow fields with an autonomous Zooglider

AbstractAn autonomous Zooglider navigated across the California Current Front into low salinity, minty waters characteristic of the California Current proper in both summers of 2019 and 2021. Diving to 400 m depth, Zooglider transited another near‐surface frontal gradient somewhat inshore. These frontal gradients were generally associated with changes in intensity, size composition, and Diel Vertical Migration responses of acoustic backscatterers. They were also associated with pronounced changes in zooplankton community composition, as assessed by a shadowgraph imaging Zoocam. Zoocam detected a decline in concentrations of copepods, appendicularians, and marine snow in the offshore direction, and an overall shift in community structure to a higher proportion of carnivorous taxa (and, in 2019, of planktonic rhizaria). No taxon was consistently elevated at all the peak frontal gradients, but appendicularians, copepods, and rhizarians sometimes showed front‐related increases in concentration. Such frontal gradient regions represent relatively abrupt transitions to different communities of planktonic organisms and suspended marine snow particles, with consequences for predator–prey relationships and the dominant vectors of particle export into subsurface waters.

Investigating the effect of Mo doping on structural and ferroelectric properties of BaTiO3 using electron microscopy

The effect of Molybdenum (Mo) doping in pure barium titanate at Ti site has been investigated using electron microscopy, x-ray diffraction and dielectric and impedance spectroscopy. The room temperature XRD data confirms the formation of Mo substituted BaTi0.94Mo0.06O3 in tetragonal symmetry. Even with the minimal doping of Mo, the first two structural transition shifts to the lower temperature by 60 and 30 K, respectively, as compared to pure barium titanate, confirmed via dielectric, polarization and x-ray diffraction measurements. In Mo doped BaTiO3, the cubic to tetragonal phase transition has been observed at ∼335 K, tetragonal to orthorhombic at ∼250 K. The orthorhombic to rhombohedral transition remains almost unaffected with Mo doping. Furthermore, transmission electron microscopy (TEM) has been employed to see the changes in microstructure/domain structure across various ferroelectric phases below 335 K which confirms the emergence of multiple twins in different ferroelectric phases.

Wealth inequality in northwestern Anatolia under the Ottomans, 1460–1870

Abstract While studies indicate that economic inequality increased in the early modern period, it is debated whether this applied to all regions, and what the causes of change were. This paper studies long-term wealth inequality in the Ottoman Empire, and its possible determinants, using data from Anatolia. Inequality tended to track demographic and economic change, but evidence for a long-term correlation is inconclusive, whereas there is evidence for the long-term disequalizing impact of taxation and changing power relations. The divergence between cities and countryside suggests structural shifts caused by external factors, and comparison with the slow economies of Europe reveals diversity within this group.

Mechanisms and effect assessment of smart city policy pilots on employment resilience: Empirical evidence based on 275 sample cities in China

In the context of a global economic slowdown and structural shifts, comprehending labor market stability is crucial for devising effective macro-employment strategies. This research introduces an innovative framework to analyze employment resilience in the wake of China's smart city pilot policy. Utilizing data from 275 prefecture-level cities across China, spanning 2008 to 2020, the study delves into the beneficial effects of the smart city pilot policy on employment resilience. It employs a dual approach, integrating the Differences-in-Differences method (DID) with robustness analysis. Findings indicate that employment resilience in smart city pilot cities is approximately 0.58% higher compared to non-pilot cities. Factors such as location, size, and city type exhibit varying influences on this outcome. The research further reveals that entrepreneurial activities significantly mediate the link between smart city policies and employment resilience. Additionally, the concentration of manufacturing and productive services, along with their interplay, demonstrates notable moderating effects. This investigation broadens the economic research scope regarding smart cities and offers fresh empirical insights into the labor market impacts of smart city pilot policies, serving as a valuable guide for policymakers in managing employment markets.

Persistence, changes and robustness of nest webs along a latitudinal gradient in the Canadian boreal forest

IntroductionIn eastern Canada, the boreal forest is associated with an important latitudinal shift in forest composition and structure, which occurs in the transition between the mixed southern boreal forest and the coniferous northern boreal forest. Along this transition, upland mixedwood stands with large deciduous trees (important for cavity-dependent vertebrate species) are gradually replaced by forests with smaller conifer trees, primarily black spruce (Picea mariana). Concomitantly, the availability of lowland forests flooded by the American beaver (Castor canadensis), which can provide adequate conditions for tree-cavity users, is also decreasing.MethodsWe hypothesized that this latitudinal gradient would bring important changes in the functional diversity and network structure of vertebrate cavity-using communities. Along this latitudinal gradient we used a nest web approach to analyze the structure and robustness of networks of cavity users in upland forests and in lowland forests flooded by beavers.ResultsDespite their low availability in the northern forest region, we found that mixedwood stands persisted throughout the boreal forest in being the main drivers of nest webs network structure of upland forests whereas old black spruce stands contribution was low. In lowland forests, beaver ponds harbored nest webs with a rich and complex structure in both forest regions. Species removal simulations revealed that across our latitudinal gradient upland and lowland forest nest webs responded differently. In upland forests, the removal of trembling aspen and the Pileated Woodpecker (Dryocopus pileatus) caused the highest proportions of secondary extinctions, showing low robustness of nest webs given that these two species were highly connected to the other species. Contrastingly, nest webs in beaver ponds were more robust mainly because excavator species used a higher diversity of tree species despite the removal of the Northern Flicker (Colaptes auratus) which induced numerous secondary extinctions. The Pileated Woodpecker remained the pivotal species across the two forest regions in upland forests whereas the Northern Flicker became the main large cavity provider in beaver ponds across the latitudinal gradient.DiscussionWe discuss how mixedwood forests and beaver ponds, which are key habitat types for the cavity-using vertebrate community across our latitudinal gradient, should be maintained and protected in landscapes under industrial timber harvesting.

CHEER and markets’ integration: evidence from selected East Asian economies

PurposeThis paper aims to investigate markets’ integration using the capital enhanced equilibrium exchange rate (CHEER) model for seven, highly competitive, East Asian countries.Design/methodology/approachThe sample consists of monthly observations, whereas unit root and cointegration techniques with structural shifts have been used.FindingsThe evidence shows that the weak form of the CHEER approach holds for Malaysia and Thailand. For China, Japan, Korea, Singapore and Taipei, only the uncovered interest parity condition is validated, implying capital markets integration. In contrast, for these five countries, the results indicate absence of goods’ markets integration. This outcome can be attributed to the impact of quite high non-tariff barriers and the Balassa–Samuelson effect.Originality/valueTo the best of the author’s knowledge, this is the first study that investigate markets’ integration in several East Asian economies, using the CHEER approach and more accurate price indices.

Unveiling the Nexus: Climate change, green innovation, and the pendulum of energy consumption and carbon emissions

This study delves into the complex interplay of climate change, natural disasters, energy consumption, and carbon emissions across 111 countries from 1990 to 2019. A structural shift in 2004 signifies altered global dynamics in CO2 emissions, closely linked to the escalation of meteorological and hydrological disasters driven by climate change. Globally, we illuminate the significant impact of climate-induced natural disasters, especially storms and extreme temperatures, on energy consumption and carbon emissions, albeit with variations. Regionally, we establish a notable positive association between extreme temperature-related disasters and both energy consumption and carbon emissions in Europe. Examining the aftermath of catastrophic events reveals an intensified influence of these disasters on carbon emissions and energy consumption in Africa, Latin America, and Europe. Developed economies experience significant impacts on carbon emissions and energy consumption from storms and extreme temperatures, while flood severity predominantly affects carbon emissions in developing countries. Additionally, we explore the potential of green patents in mitigating energy consumption and emissions triggered by disasters. While not conclusively proven, the statistically significant impact of green patents on energy conservation holds profound policy implications for advancing climate understanding, transforming energy landscapes, and addressing future sustainability concerns.

An Enigmatic Soft-Tissue Creeping Phenomenon: The Spontaneous Peri-Implant Mucosa Margin and Papilla Growth, Part Two-A Scientifically Supported Hypothesis Article.

In our previous article, we observed and measured a spontaneous growth in the coronal direction of the keratinized tissues present around implants. This growth involved both free margins and interdental papillae, and we indicated our hypothesis on the probable cause of this still-unexplained phenomenon. The growth of oral soft tissues involves several other structures, such as the linea alba and tongue indentation. Our idea holds that growth of these tissues is generated by the negative intraoral pressure created in the oral phase of swallowing and the subsequent resting position, which through the resulting suction causes a shift of these soft structures in the gaps around the dental crowns. Other hypotheses have been suggested in the past to understand this phenomenon of soft tissue growth, which still lacks data supporting etiological evidence. The purpose of this article is to thoroughly analyze and verify our model by comparing the clinical observations with citations and examples from the literature, combined with notions of physiology, biology, and physics that help in clarifying these events. To better explain the mechanisms of oral soft tissue growth, photographs of clinical cases paradigmatic of the phenomenon are shown.

Tree species diversity drives the land surface phenology of seasonally dry tropical woodlands

Abstract Seasonal foliage display (leaf phenology) is a key determinant of ecosystem function. Variation in land surface phenology, observed via space‐borne remote sensing, can be explained at broad spatial scales by climate, but we lack understanding of how vegetation structure and floristic diversity mediates these relationships. This lack of understanding hampers our ability to predict changes in phenology and therefore ecosystem function, in light of rapid ongoing shifts in biodiversity and ecosystem structure due to land use and climate change. We combined a network of 619 vegetation monitoring sites across seasonally dry tropical deciduous woodlands in Zambia with land surface phenology metrics to investigate the role of tree species diversity, composition and vegetation structure on patterns of land surface phenology, including the phenomenon of pre‐rain green‐up. Tree species diversity was associated with earlier pre‐rain green‐up, a longer growing season, and greater cumulative foliage production. Independent of diversity, proportional abundance of Detarioideae species (subfamily of Fabaceae) was associated with a longer growing season by facilitating earlier pre‐rain green‐up. Woodland stands with larger trees green up earlier, suggesting access to deep groundwater reserves. Senescence metrics showed variation among sites but were not well‐explained by precipitation, temperature, structure or diversity. Synthesis: Tree diversity, composition and structure are co‐determinants of seasonal patterns of foliage display in seasonally dry tropical deciduous woodlands, as measured via land surface phenology, at regional scale. Our study identifies both a niche complementarity effect whereby diverse woodlands exhibit longer growing seasons, as well as a mass‐ratio effect whereby detarioid species drive earlier pre‐rain green‐up, providing insights into the mechanisms underlying the biodiversity ecosystem function relationship in this biome. We stress the importance of considering biotic controls on ecosystem functioning in the next generation of earth‐system models predicting the response of communities to global change.

An altered uterine microbiota with endometrial hyperplasia

BackgroundEndometrial hyperplasia (EH) is a precursor to endometrial cancer, and the role of the microbiome in its development is unclear.ResultsThe present study investigated the uterine microbiome in patients with benign uterine conditions and endometrial hyperplasia. A significant structural shift in the uterine microbiome of patients with endometrial hyperplasia compared to those with benign conditions was found. Delftia, Serratia and Stenotrophomonas were significantly enriched in endometrial hyperplasia samples and associated with the presence of endometrial hyperplasia.ConclusionsThe novel finding suggested that increased abundance of Delftia, Serratia and Stenotrophomonas is associated with the presence of endometrial hyperplasia. Further investigation is needed to determine the value of these microbes as biomarkers for endometrial hyperplasia.