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Abstract Expressionism is often regarded as the first purely American art movement and the first to gain mass cultural recognition. Prior to the 1940s, the consideration and appreciation of abstract art belonged to a certain intellectual elite, but the intimidating complexity of Abstract Expressionism, the daring allure of its artists, and the particularities of mid-century American culture converged to transform the avant-garde into consumer spectacle. This shift represented, and was symptomatic of, a larger societal rearrangement: information and commodity superseded industrialized labor as the core of American culture. Jackson Pollock, America’s first avant-garde superstar, stood at the center of this shift, at once representing both active creative labor and the commodification of the idea of that labor. Hans Namuth’s photographs and films of Pollock placed him and his art firmly in the realm of consumable popular spectacle, underlying further connections to Hollywood film and prominent print media. This article examines how Pollock became a paradigmatic figure in the avant-garde’s proliferation into mass culture and asserts that mass culture did not simply subsume the avant-garde. Rather, the two realms engaged in a mutual construction that pushed the avant-garde across numerous social boundaries. The artistic, critical, and popular receptions that grew out of this convergence erased distinctions between ‘high’ and ‘low’ culture.

Several hypotheses posit a link between the origin of Homo and climatic and environmental shifts between 3 and 2.5 Ma. Here we report on new results that shed light on the interplay between tectonics, basin migration and faunal change on the one hand and the fate of Australopithecus afarensis and the evolution of Homo on the other. Fieldwork at the new Mille-Logya site in the Afar, Ethiopia, dated to between 2.914 and 2.443 Ma, provides geological evidence for the northeast migration of the Hadar Basin, extending the record of this lacustrine basin to Mille-Logya. We have identified three new fossiliferous units, suggesting in situ faunal change within this interval. While the fauna in the older unit is comparable to that at Hadar and Dikika, the younger units contain species that indicate more open conditions along with remains of Homo . This suggests that Homo either emerged from Australopithecus during this interval or dispersed into the region as part of a fauna adapted to more open habitats. Key events in human evolution are thought to have occurred between 3 and 2.5 Ma, but the fossil record of this period is sparse. Here, Alemseged et al. report a new fossil site from this period, Mille-Logya, Ethiopia, and characterize the geology, basin evolution and fauna, including specimens of Homo .

Sol–gel coatings can provide anti-fouling and erosion resistance while being safe to use in the marine environment. MAPTMS/ZPO multilayer coatings deposited on the AA2024-T3 aluminium surface using the dip-coating method at three different thicknesses (2, 4, and 6 µm) are investigated in this work. The coatings are characterised in terms of physical and mechanical properties, and these properties are investigated in comparison to previously obtained cavitation erosion resistance levels of the coatings. Additionally, the efficiency of the coatings against biofouling was assessed using Phaeodactylum tricornutum, a marine diatom. The influence of the formation of organic–inorganic hybrid materials (OIHMs) from the prepared sols on the physical and mechanical properties of the coatings were analysed. A variety of techniques, including attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR), water contact angle (WCA) measurements, pencil hardness testing, cross-cut adhesion testing, a roughness profilometer, and nano-indentation, were performed on the bare and coated substrates. The results indicated that the thickness, hydrophobicity, and adherence of the coatings are strongly affected by the roughness. The elastic strain failure (H/E) and resistance to plastic deformation (H3/E2) coefficients were higher than those of the bare substrate before and after the cavitation erosion test, indicating that the coating had a higher ability to withstand deformation in comparison to the substrate alone. Furthermore, the microscopic analysis of a marine diatom, Phaeodactylum tricornutum, revealed that coated surfaces exhibited a decreased rate of bacterial adhesion and biofilm formation. The data show that sol–gel formed coatings outperform uncoated AA2024-T3 in terms of hardness, elastic strain, plastic deformation, and biofouling resistance. These characteristics are attributed to the coatings’ mechanical and adhesive capabilities, as well as their tribological behaviour.

AMPA receptors (AMPAR) mediate excitatory neurotransmission in the brain, and rarely can be targeted by autoantibodies to cause encephalitis, often as a paraneoplastic phenomenon. The associated clinical syndrome can feature a wide variety of symptoms, though persisting visual field defects are scarcely reported.We report the case of a previously well 48-year-old gentleman of Kenyan descent who presented with rapidly progressive visual disturbance, global cognitive decline, severe agitation, auditory and visual hallucinations, and marked ataxia. Admission to ICU for intubation and ventilation to facilitate sedation was required to manage extreme behavioural disturbance. MRI showed scattered abnormal FLAIR and DWI signal involving multiple cortical regions, including bilateral occipital lobes. He was subsequently found to have anti-AMPAR antibodies in both his serum and cerebrospinal fluid. He had no evidence of malignancy on extensive testing.Following prolonged treatment with high dose steroids, intravenous immunoglobulin, plasma exchange and rituximab he has had a significant clinical improvement. However, his bilateral visual field constriction remains severe.This case contributes to the clinical understanding of anti-AMPAR encephalitis, its various manifestations and prognosis and highlights the challenges of management.

This paper explores the potential use of conductive alginate capsules encapsulating a bitumen rejuvenator as a new extrinsic self-healing asphalt method. The capsules combine two existing self-healing asphalt technologies: (1) rejuvenator encapsulation and (2) induction heating to create a self-healing system that will provide rapid and effective asphalt pavement repair. The work presents a proof of concept for the encapsulation process, which involves embedding the capsules into the bitumen mortar mixture and the survival rate of the capsules in the asphalt mixture. A drip capsule production process was adopted and scaled up to the production of 20l wet capsules at rate of 0.22 l/min. To prove the effectiveness and its ability to survive asphalt production process, the capsules were prepared and subjected to thermogravimetric analysis (TGA) and uniaxial compression Test (UCT). The test results demonstrated that the capsules had suitable thermal characteristics and mechanical strength to survive the asphalt mixing and compaction process. Scanning electron microscopy (SEM) was employed to investigate physiological properties, such as rejuvenator (oil) and iron particle distribution, within the capsules. The electrical resistance tests proved that the capsules were capable of conducting electrical current. The capsules were also tested for their conductive properties in order to determine whether they are capable of conducting and distributing the heat once subjected to induction heating. The results showed that capsules containing higher amounts of iron (alginate/iron powder in a ratio of 20:80 by weight) can efficiently conduct and distribute heat. To prove its success as an asphalt healing system, conductive alginate capsules encapsulating a bitumen rejuvenator were embedded in a bitumen mortar mix. The samples where then subjected to local damaging and healing events, and the degree of healing was quantified. The research findings indicate that conductive alginate capsules encapsulating a bitumen rejuvenator present a promising new approach for the development of an extrinsic self-healing asphalt pavement systems.

Knowledge of microparticle geometry is essential for accurate calculation of ice core volume-related dust metrics (mass, flux, and particle size distributions) and subsequent paleoclimate interpretations, yet particle shape data remain sparse in Antarctica. Here we present 41 discrete particle shape measurements, volume calculations, and calibrated continuous particle time series spanning 50–16 ka from the South Pole Ice Core (SPC14) to assess particle shape characteristics and variability. We used FlowCAM, a dynamic particle imaging instrument, to measure aspect ratios (width divided by length) of microparticles. We then compared those results to Coulter counter measurements on the same set of samples as well as high-resolution laser-based (Abakus) data collected from SPC14 during continuous flow analysis. The 41 discrete samples were collected during three periods of millennial-scale climate variability: Heinrich Stadial 1 (18–16 ka, n=6; ∼250 years per sample), the Last Glacial Maximum (LGM) (27–18 ka, n=19; ∼460 years per sample), and during both Heinrich Stadial 4 (42–36 ka, n=8; ∼620 years per sample) and Heinrich Stadial 5 (50–46 ka, n=8; ∼440 years per sample). Using FlowCAM measurements, we calculated different particle size distributions (PSDs) for spherical and ellipsoidal volume estimates. Our calculated volumes were then compared to published Abakus calibration techniques. We found that Abakus-derived PSDs calculated assuming ellipsoidal, rather than spherical, particle shapes provide a more accurate representation of PSDs measured by Coulter counter, reducing Abakus to Coulter counter flux and mass ratios from 1.82 (spherical assumption) to 0.79 and 1.20 (ellipsoidal assumptions; 1 being a perfect match). Coarser particles (>5.0 µm diameter) show greater variation in measured aspect ratios than finer particles (<5.0 µm). While fine particle volumes can be accurately estimated using the spherical assumption, applying the same assumption to coarse particles has a large effect on inferred particle volumes. Temporally, coarse and fine particle aspect ratios do not significantly change within or among the three time periods (p value >0.05), suggesting that long-range transport of dust is likely dominated by clay minerals and other elongated minerals.

We develop a new method that allows for more accurate biovolume calculations of microorganisms. This method also allows the volume of individual skeletal features of microorganisms to be analyzed separately so that estimates of the resource cost per evolutionary adaptations may be assessed. We also provide a means to link community changes to alterations in nutrient cycles, ecosystem function, and rock-forming processes by plankton. This method integrates computer-aided design software from engineering and architecture into biological applications. Our method substantially improves the accuracy of biovolume estimates for species which currently rely upon simple geometric models that preclude the presence of ultrastructure in microorganism skeletons. In addition, using simple shapes to represent the skeletal form of microorganisms prohibits the exploration of resource cost that various adaptations, for example, spines for protection from grazers, have imposed upon plankton. Thus, integrating architectural and engineering approaches more broadly into biovolume estimations produces new insight into the physiology of microorganisms that can turn speculations into quantitative analyses.

Background Drought stress is currently the primary abiotic stress factor for crop loss worldwide. Although drought stress reduces the crop yield significantly, species and genotypes differ in their stress response; some tolerate the stress effect while others not. In several systems, it has been shown that, some of the beneficial soil microbes ameliorate the stress effect and thereby, minimizing yield losses under stress conditions. Realizing the importance of beneficial soil microbes, a field experiment was conducted to study the effect of selected microbial inoculants namely, N-fixing bacteria, Bradyrhizobium liaoningense and P-supplying arbuscular mycorrhizal fungus, Ambispora leptoticha on growth and performance of a drought susceptible and high yielding soybean cultivar, MAUS 2 under drought condition. Results Drought stress imposed during flowering and pod filling stages showed that, dual inoculation consisting of B. liaoningense and A. leptoticha improved the physiological and biometric characteristics including nutrient uptake and yield under drought conditions. Inoculated plants showed an increased number of pods and pod weight per plant by 19% and 34% respectively, while the number of seeds and seed weight per plant increased by 17% and 32% respectively over un-inoculated plants under drought stress condition. Further, the inoculated plants showed higher chlorophyll and osmolyte content, higher detoxifying enzyme activity, and higher cell viability because of less membrane damage compared to un-inoculated plants under stress condition. In addition, they also showed higher water use efficiency coupled with more nutrients accumulation besides exhibiting higher load of beneficial microbes. Conclusion Dual inoculation of soybean plants with beneficial microbes would alleviate the drought stress effects, thereby allowing normal plants’ growth under stress condition. The study therefore, infers that AM fungal and rhizobia inoculation seems to be necessary when soybean is to be cultivated under drought or water limiting conditions.

A taxonomic description of three novel species and update of two previously described Bacillariophyta (Diatom) species from the Pliocene Hadar Formation, Afar Depression of Ethiopia is presented. The taxonomic description preludes a quantitative reconstruction of the environmental conditions of Paleolake Hadar, also presented herein. This thesis plays an integral role in the Hominin Sites and Paleolakes Drilling Project (HSPDP), an interdisciplinary investigation into the climate, environment, and ecological context of human and hominin evolution in East Africa. The HSPDP aims to provide a continuous record of paleo-conditions that influenced hominin evolution. This thesis focuses on the Northern Awash Werenso drill-core site from the Afar Depression, Ethiopia. This site was chosen to target the Pliocene Hadar Formation because of prominent hominin fossil finds of Australopithecus afarensis including the iconic and most complete specimen, 'Lucy'. This investigation has revealed novel species of diatoms and a highly variable climate system closely associated with the last known temporal occurrence of Australopithecus afarensis fossils.

This chapter contains sections titled: Introduction Materials and Methods Characterisation Techniques Results and Discussion Conclusions