We present the results of a study of chromium (Cr) content, Cr speciation and its stable isotope composition in a terra rossa weathering profile, which includes ferromanganese concretions (FMCs) and ...gibbsite spots, developed on dolomite in the Yunnan–Guizhou Plateau in south central China. Sequential extraction results show that the Cr in all samples is present mainly within the residual fraction and oxidizable fraction, and that the Cr content of the exchangeable fraction and reducible fraction is very low. The significantly high Cr content (mean of 21.0 ppm) of the oxidizable fraction is a potential environmental hazard. The Cr in the terra rossa and gibbsite spots exhibits absolute accumulation throughout the profile; correspondingly, the FMCs are significantly enriched in most trace elements, except for Cr. Re-oxidation of Cr(III) to soluble Cr(VI) by MnO2 is likely responsible for the relative depletion of Cr in the FMCs. In the bulk dolomite, the δ53Cr values of the carbonate component and detrital component are 0.447‰ and −0.437‰, respectively. The δ53Cr signal in both fractions is heterogeneous, while both δ53Cr signals are significantly different from that of bulk silicate Earth (BSE; −0.124 ± 0.101‰). Our results provide a proof of concept that the allogenic Cr-isotopic composition of terrigenous minerals in carbonate rocks, can provide new insights into paleo-terrestrial oxidative weathering. Overall, the terra rossa is characterized by the enrichment of heavy Cr isotopes compared to the detrital component of dolomite. Hence, the isotopic signature of Cr does not support the idea that the detrital component in dolomite is the sole parent material of the terra rossa. The absolute accumulation of Cr and heavy Cr isotope enrichment in terra rossa indicate that the extraneous input of dissolved Cr(VI) with a heavy isotopic signature occurred during dolomite weathering and terra rossa formation.
•Cr exhibits absolute accumulation within a terra rossa profile.•The high Cr contnet of the oxidizable fraction is a potential environmental hazard.•Extraneous sources introduce isotopically heavy Cr(VI) into the weathering system.•δ53Cr of detrital component reflects paleo-terrestrial oxidative weathering.•The detrital component in dolomite is not the sole parent material for terra rossa.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Tebuconazole, consisting of two enantiomers, has a high detectable rate in the soil. The residue of tebuconazole in the soil may cause risk to microbiota community. Antibiotic resistance genes (ARGs) ...are considered as emerging environmental contaminants, and they can be transferred vertically and horizontally between microbiota community in the soil. Until now, the enantioselective effect of tebuconazole on the microbiota community and ARGs in the soil and earthworm gut has remained largely unknown. Tebuconazole enantiomers showed different bioconcentration behaviors in earthworms. The relative abundances of bacteria belonging to Actinobacteriota, Crenarchaeota and Chloroflexi in R-(−)-tebuconazole-treated soil were higher than those in S-(+)-tebuconazole-treated soil at same concentrations. In the earthworm gut, bacteria belonging to Proteobacteria and Bacteroidota exhibited different relative abundances between the S-(+)-tebuconazole and R-(−)-tebuconazole treatments. The numbers and abundances of ARGs in the soil treated with fungicides were higher than those in the control. In earthworm gut, the diversities of ARGs in all treatments were higher than that in the control, and the relative abundances of Aminoglycoside, Chloramphenicol, Multidrug resistance genes and mobile genetic elements (MGEs) in R-(−)-tebuconazole-treated earthworm gut were higher than those in S-(+)-tebuconazole-treated earthworm gut. Most of ARGs showed a significantly positive correlation with MGEs. Based on network analysis, many ARGs may be carried by bacteria belonging to Bacteroidota and Proteobacteria. These results provide valuable information for understanding the enantioselective effect of tebuconazole on the microbiota community and ARGs.
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•Tebuconazole showed enantioselective bioconcentration behavior in earthworms.•Tebuconazole enantiomers showed different effects on abundance of bacteria.•Some ARGs exhibited higher abundances in R-(−)-tebuconazole treatments.•Many bacteria belonging to Proteobacteria and Bacteroidota may carry some ARGs.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Correlations within and between Precambrian basins are heavily reliant on precise dating of volcanic units (i.e., tuff beds and lava flows) in the absence of biostratigraphy. However, felsic tuffs ...and lavas are rare or absent in many basins, and direct age determinations of Precambrian basaltic lavas have proven to be challenging. In this paper, we report the first successful application of 40Ar/39Ar dating to pyroxene from a Neoproterozoic basalt unit, the Keene Basalt in the Officer Basin of central Australia. 40Ar/39Ar analyses of igneous pyroxene crystals yielded an age of 752 ± 4 Ma (mean squared weighted deviation = 0.69, p = 72%), which is underpinned by 40Ar/39Ar plagioclase age (753.04 ± 0.84 Ma) from the basalt. This age is significant because the Keene Basalt is one of the very few extrusive igneous rocks identified within the Neoproterozoic successions of central Australia and is potentially an important time marker for correlating the Neoproterozoic stratigraphy within, and beyond, the central Australian basins. Our geochronological and geochemical data show that the Keene Basalt, which is characterized by enriched elemental and Nd‐Pb isotopic signatures, is strikingly similar to, and coeval with, the 755 ± 3 Ma Mundine Well Dolerite in northwestern Australia. Here we suggest that both are part of the same large igneous province (~6.5 × 105 km2) related to breakup of the supercontinent Rodinia. This study demonstrates the potential of pyroxene 40Ar/39Ar geochronology to date ancient flood basalts and to provide pivotal time constraints for stratigraphic correlations of Precambrian basins.
Plain Language Summary
Ancient basaltic lavas erupted on Earth's crust hold critical clues about the tectonic and igneous history of geologic past and are important for correlating Precambrian stratigraphy and reconstructing supercontinents. However, constraining the crystallization age of basaltic lavas proves challenging due to the dearth of commonly used uranium‐lead geochronometers such as zircon in such rocks. In this research, we applied 40Ar/39Ar dating of pyroxene and plagioclase to establish the eruption age of a critical basalt lava suite, the Keene Basalt, in the Neoproterozoic Officer Basin in central Australia. The new age, combined with geochemical constraints, contributes to conclusively defining the genetic affinity and geodynamic setting of the basalt unit. Application of pyroxene 40Ar/39Ar dating to terrestrial basalts represents an important technical breakthrough, and we report the first successful result for a Precambrian basalt. The robustly dated Keene Basalt is an important time marker for correlating the Neoproterozoic successions and associated glacial deposits in Australia and worldwide. The new age and geochemistry of the basalt are used to test its relationship to known Neoproterozoic igneous events. Our data, integrated with existing evidence, reveals a 755‐ to 750‐Ma large igneous province related to Rodinia breakup.
Key Points
We report the first application of pyroxene 40Ar/39Ar dating to a Precambrian basaltic lava, the Keene Basalt in central Australia
The Keene Basalt is correlated with the Mundine Well Dolerite, both being part of a 755‐ to 750‐Ma LIP
The robustly dated Keene Basalt is an important time marker for correlating Neoproterozoic successions in Australia and worldwide
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
canonical correlations (M
2
CCs) framework for subspace learning. In the proposed framework, the input data of each original view are mapped into multiple higher dimensional feature spaces by ...multiple nonlinear mappings determined by different kernels. This makes M
2
CC can discover multiple kinds of useful information of each original view in the feature spaces. With the framework, we further provide a specific multi-view feature learning method based on direct summation kernel strategy and its regularized version. The experimental results in visual recognition tasks demonstrate the effectiveness and robustness of the proposed method.
Determining the complex relationships between diseases, polymorphisms in human genes and environmental factors is challenging. Multifactor dimensionality reduction (MDR) has been proven to be capable ...of effectively detecting the statistical patterns of epistasis, although classification accuracy is required for this approach. The imbalanced dataset can cause seriously negative effects on classification accuracy. Moreover, MDR methods cannot quantitatively assess the disease risk of genotype combinations. Hence, we introduce a novel weighted risk score-based multifactor dimensionality reduction (WRSMDR) method that uses the Bayesian posterior probability of polymorphism combinations as a new quantitative measure of disease risk. First, we compared the WRSMDR to the MDR method in simulated datasets. Our results showed that the WRSMDR method had reasonable power to identify high-order gene-gene interactions, and it was more effective than MDR at detecting four-locus models. Moreover, WRSMDR reveals more information regarding the effect of genotype combination on the disease risk, and the result was easier to determine and apply than with MDR. Finally, we applied WRSMDR to a nasopharyngeal carcinoma (NPC) case-control study and identified a statistically significant high-order interaction among three polymorphisms: rs2860580, rs11865086 and rs2305806.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
Considering the axial and radial loads, a math- ematical model of angular contact ball bearing is deduced with Hertz contact theory. With the coupling effects of lateral, torsional and axial ...vibrations taken into account, a lumped-parameter nonlinear dynamic model of helical gearrotor-bearing system （HGRBS） is established to obtain the transmission system dynamic response to the changes of dif- ferent parameters. The vibration differential equations of the drive system are derived through the Lagrange equation, which considers the kinetic and potential energies, the dis- sipative function and the internal/external excitation. Based on the Runge-Kutta numerical method, the dynamics of the HGRBS is investigated, which describes vibration properties of HGRBS more comprehensively. The results show that the vibration amplitudes have obvious fluctuation, and the frequency multiplication and random frequency components become increasingly obvious with changing rotational speed and eccentricity at gear and bearing positions. Axial vibration of the HGRBS also has some fluctuations. The bearing has self-variable stiffness frequency, which should be avoided in engineering design. In addition, the bearing clearance needs little attention due to its slightly discernible effect on vibration response. It is suggested that a careful examination should be made in modelling the nonlinear dynamic behavior of a helical gear-rotor-bearing system.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
It is imperative to optimally utilize virtues and obviate defects of fully automated analysis and expert knowledge in new paradigms of healthcare. We present a deep learning-based semiautomated ...workflow (RAINMAN) with 12,809 follow-up scans among 2,172 patients with treated nasopharyngeal carcinoma from three centers (ChiCTR.org.cn, Chi-CTR2200056595). A boost of diagnostic performance and reduced workload was observed in RAINMAN compared with the original manual interpretations (internal vs. external: sensitivity, 2.5% p = 0.500 vs. 3.2% p = 0.031; specificity, 2.9% p < 0.001 vs. 0.3% p = 0.302; workload reduction, 79.3% vs. 76.2%). The workflow also yielded a triaging performance of 83.6%, with increases of 1.5% in sensitivity (p = 1.000) and 0.6%–1.3% (all p < 0.05) in specificity compared to three radiologists in the reader study. The semiautomated workflow shows its unique superiority in reducing radiologist’s workload by eliminating negative scans while retaining the diagnostic performance of radiologists.
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•A semiautomated workflow was constructed for monitoring recurrent NPC on MR scans•The workflow reduces radiologist workload while retaining undamaged performance•The workflow provided an approach utilizing virtues of machine and human
Health technology; Applied computing
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Widespread Cenozoic basalts, erupted at ca. 24–0.16 Ma in central Inner Mongolia, eastern China, are significant for understanding the potential links between deep subduction of oceanic slabs and the ...genesis of continental intra-plate magmatism. Here we examine the whole-rock geochemical and isotopic data, as well as olivine compositions, for Cenozoic alkali and tholeiitic basalts from the Abaga, Huitengliang, and Chifeng areas in central Inner Mongolia. The results suggest that fractional crystallization of olivine + clinopyroxene (in the alkali basalts) and olivine (in the tholeiites), played a key role in their magmatic evolution, without significant crustal contamination or post-magmatic alteration. Geochemical and petrogenetic analyses show that pyroxene and garnet were dominant phases in the residual mineral assemblage for both alkali basalts and tholeiites, implying a pyroxenite source for these basalts. We propose that a pyroxenite-dominated source may be the product of reaction between recycled oceanic slab-derived melts and surrounding mantle peridotites. The spatial and geochemical variations of the Cenozoic basalts in central Inner Mongolia, together with recent geophysical and geological observations in eastern China, imply that the origin and evolution of large-scale Cenozoic continental intra-plate magmatism can be related to subduction of the Paleo-Pacific and Paleo-Asian oceanic slabs. Incorporation of recycled oceanic materials from these two subducted slabs thus influenced the mantle source lithologies and deep-Earth geodynamic processes beneath eastern China.
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•A pyroxenite source is inferred for the Abaga, Huitengliang and Chifeng basalts•Recycled altered oceanic crust contributed to the generation of the basalts•Geochemical variation relates to recycled Paleo-Asian and -Pacific oceanic slabs
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Background
A positive association between the ABO blood types and survival has been suggested in several malignancies. The aim of this study was to assess the role of the ABO blood types in ...predicting the prognosis of Chinese patients with curatively resected non‐small cell lung cancer (NSCLC).
Methods
We retrospectively analyzed 1601 consecutive Chinese patients who underwent curative surgery for NSCLC between January 1, 2005 and December 31, 2009. The relationship between the ABO blood types and survival was investigated. In addition, univariate and multivariate analyses were performed.
Results
Group 1 (patients with the blood type O or B) had significantly prolonged overall survival (OS) compared with group 2 (patients with the blood type A or AB), with a median OS of 74.9 months versus 61.5 months hazard ratio (HR) 0.83; 95% confidence interval (CI) 0.72–0.96; P = 0.015. Additionally, group 1 had significantly longer disease‐free survival (DFS; HR 0.86; 95% CI 0.76–0.98; P = 0.022) and locoregional relapse‐free survival (LRFS; HR 0.79; 95% CI 0.64–0.98; P = 0.024) than group 2. The association was not significantly modified by other risk factors for NSCLC, including smoking status, pathologic tumor‐node‐metastasis stage, pT category, pN category, and chemotherapy.
Conclusions
There is an association between the ABO blood types and the survival of Chinese patients with resected NSCLC. Patients with the blood type O or B had significantly prolonged OS, DFS, and LRFS compared with those with the blood type A or AB.
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FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
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