High Pe Research Articles

Thermoplastic Toughening of a Semiaromatic Polyamide with an Amino-telechelic Polyethylene.

Semiaromatic polyamides are used for metal replacement in advanced engineering applications to reduce weight and improve efficiency, but their range of application is limited by their inherent lack of ductility and toughness. Here, we combined semiaromatic polyamide poly(hexamethylene terephthalamide-co-isophthalamide) (PA6TI) with up to 30 wt % amine-terminated polyethylene (PE(NH2)2) by high-temperature melt compounding, which was suggested to lead to the formation of PA-PE block copolymers at the interface between the PE(NH2)2 and the PA6TI. This resulted in PA6TI/PE(NH2)2 blends with smaller, more uniform particle sizes than in PA6TI blended with nonfunctional PE or the commercial impact modifier, maleic anhydride-functionalized styrene-ethylene-butylene-styrene (SEBS) under the same conditions. The PA6TI/PE(NH2)2 blends and the corresponding glass fiber-reinforced composites consequently showed significantly greater increases in room-temperature tensile ductility and fracture energy with respect to unmodified PA6TI, as well as maintained mechanical stability at high temperatures, and only modest decreases in stiffness and strength, even at high PE(NH2)2 contents. These improvements were attributed to the crystallinity of the PE(NH2)2 particles and to improved morphological stabilization and matrix-particle adhesion, consistent with the presence of PA-PE block copolymer at the matrix-particle interfaces.

P373 IN SUPPORT OF THE NEED FOR P.E.R.T. (PULMONARY EMBOLISM RESPONSE TEAMS) IN PULMONARY EMBOLISM (PE)

Abstract Pulmonary embolism (PE) is one of the leading causes of cardiovascular death with a wide range of criticality and complex and varied pathogenesis. A rapid therapeutic decision reverses the rapid progression towards a fatal outcome. A 64 years old patient, obese and hypertensive, returning from an intercontinental flight, went to the emergency room because of worsening dyspnoea and chest pain, which he had been suffering for a week; he arrived tachycardic, tachypnoic and with 91% O2 saturation in ambient air. A CT angiography showed extensive thrombosis of both main branches of the pulmonary artery (PA). Echocardiography confirmed right ventricular involvement, which was already hypokinetic and with a RV/LV ratio double than normal, which corresponds to a progressive drop in pressure and for which he was transferred to the cardiac intensive unit. The patient‘s history, comorbidities, risk of haemorrhage, imaging and laboratory data were analysed, leading to an evaluation of high risk PE, hemodynamic instability and positive cardiac biomarkers. With the availability of on–site equipment and trained personnel, the patient underwent ultrasound–guided locoregional thrombolysis through the placement of dedicated catheters capable of infusing into each PA branch 1mg of rtPA/h for 12 hours and ultrasound throughout the course of the catheter to increase the penetrance of thrombolysis into old thrombi (Ultrasound Accelerated Thrombolysis). As early as 6 hours, at echocardiographic control, there was a reduction in the RV/LV ratio to below 1.5, corresponding to a restoration of pressor stability. PERT shortens the time of decision of the best medical approach, which is the most effective method available to deal with the emergency. But PERT is also useful in low–risk PE in patients with significant comorbidities that contraindicate anticoagulant therapy, or in PE that is an incidentalomas, according to the wisdom of the radiologists in the group who know how to identify inveterate thromboses or PA sarcoma occlusion which are otherwise treatable. Hence the need for a multidisciplinary team: a) able to assess the patient with PE and provide the correct treatment which includes a range of medical, surgical and endovascular therapies; b) skilled in ensuring the follow–up of the patient with PE (post–thromboembolic pulmonary hypertension; c) skilled in getting the components to communicate about the effectiveness of treatment in the individual patient.

Curvature and shape relaxation in surface-viscous domains.

The mechanics of curved, heterogeneous, surfactant-laden surfaces and interfaces are important to a variety of engineering and biological applications. To date, most models of rheologically complex interfaces have focused on homogeneous systems of planar or fixed curvature. In this study, we investigate a simple, dynamical model of a two-phase surface fluid on a curved interface: a condensed, surface-viscous domain embedded within a surface-inviscid, spherical interface of time-varying radius of curvature. Our aim is to understand how changes in surface curvature generate two-dimensional Stokes flows inside the domain, thereby resisting curvature deformation and distorting the domain shape. We model the surface stress within the domain using the classical Boussinesq-Scriven constitutive equation, simplified for a near-spherical cap undergoing a small-amplitude curvature deformation. We then analyze the frequency-dependent dynamics of the surface stress and curvature within the domain when the pressure difference across the surface is sinusoidally oscillated. We find that the curvature relaxes diffusively, and thus define a Peclet number (Pe) relating the rate of diffusion to the oscillation frequency. At small enough Pe, the surface deforms quasi-statically, whereas at high Pe, the curvature varies sharply within a thin boundary layer adjacent to the domain border. Consequently, the curvature of the domain appears discontinuous from the rest of the surface under rapid oscillation. We then examine the linear stability of the domain shape to small, non-axisymmetric perturbations when the surface is steadily compressed (i.e., the pressure difference across it is increased). While the line tension at the domain border tends to maintain circular symmetry, surface-viscous stresses generated by surface compression tend to destabilize the perimeter. A shape instability arises above a critical surface capillary number (Ca) relating surface-viscous stresses to line tension. Moreover, we show that the mechanism of instability is distinct from that of the famous Saffman-Taylor fingering instability. Various extensions of our model are discussed, including materials with finite dilatational surface viscosity, linear and nonlinear (visco)elasticity, and large-amplitude deformations.

Predictors of 6 month-mortality following intermediate-high and high risk pulmonary embolism

Abstract Funding Acknowledgements Type of funding sources: None. BACKGROUND Pulmonary embolism (PE) is the third most frequent cardiovascular disease and is associated with high mortality, during the admission and short-term follow-up. Due to Right Ventricular (RV) dysfunction or Pulmonary Hypertension (PH), also because anticoagulation's bleeding complications and PE may be the first manifestation of underlying cancer. Purpose To determine clinical and echocardiography characteristics and 6 month-mortality of patients with an intermediate-high or high PE admitted in the Acute Cardiovascular Care Unit (ACCU). Methods The present study is a retrospective analysis of 137 patients with intermediate-high and high risk PE admitted in our ACCU between May-2017 and May-2021. Clinical, biochemical and echocardiographic variables were analyzed on admission, prior to discharge and 6 month follow-up period. Mortality was evaluated at 6 months. Univariate logistic analysis was used to analyze markers associated with mortality. Results The majority were women 77 (56%), aged between 16-90 years. 78 (57%) had hypertension, 64(46%) Dyslipemia, 50(37%) obesity and 12 (9%) had previous cancer. On admission 76( 56%) patients consulted for dyspnea and 52(38%) for syncope. 81 (60%) presented respiratory failure (pO2<60 mmHg), 98(72%) had elevated Nt-proBNP (3583 ±4874) and 109 (80%) Troponin. 36 (27%) presented a Shock Index>1. On admission echocardiography, 90 (66%) had RV dysfunction (TAPSE≤16mm), 120(89%) a dilated RV (basal RV/LV ratio>1.0) and PH was: 44 (36%) Mild, 48 (39%) Moderate and 22 (18%) Severe. Regarding first PE treatment patients received: 85 (62%) Heparin Sodium, 11 (8%) Systemic fibrinolysis, 31 (23%) Catheter-directed therapies and 10 (7%) LMWH. During the admission 6 (5%) patients suffer minor and 9 (7%) major bleeding. At discharge 101 (82%) improved RV function and 95 (82%) improved PH (None 62 (54 %), Mild 40 (35%), Moderate 11 (9%) and Severe 2 (2%)). In 6 months follow-up, 13(10%) died, 3(2%) were readmitted because of new PE and 4(3%) because of major bleeding. New cancer was diagnosed in 12(9%) patients. The majority (74%) were in NYHA-I. The risk of death at 6 months (Table 1) were significantly increased in diabetes patients (46% vs 16%,p=0.009), those in which RV dysfunction persisted (50% vs 8%,p=0.001), in case of major bleeding readmission (43% vs 0.8%,p=0.001) or those with an underlying cancer (57% vs 7%,p=0.001). Variables associated with 6 months-mortality in the univariate analysis (Table 2) are: Nt-proBNP, Major bleeding during admission and readmission, an underlying cancer, and RV dysfunction prior to discharge, a persisted Dilated-RV and moderate or severe PH before discharge. Conclusion In our sample, in patients admitted due to intermediate-high or high risk PH, the persistence of RV dysfunction, having diabetes and suffering from cancer or major bleeding in a short follow-up increases the risk of death. Although our data may be misestimated because of the low rate of events.

Hotspots within a hotspot: evolutionary measures unveil interesting biogeographic patterns in threatened coastal forests in Chile

Abstract Given the continuous loss of biodiversity, there is an urgent need to study its patterns to generate conservation measures. Complementing traditional biodiversity measures with indices that incorporate evolutionary aspects such as phylogenetic diversity or phylogenetic endemism (PD or PE) allows us to infer possible historical processes that could explain the conformation of current biodiversity. In this study, patterns of richness and endemism were determined and contrasted with the evolutionary indices PD, PE, PDres (residual PD), RPD (relative PD) and RPE (relative PE) for the woody flora in a latitudinal gradient (30°S to 40°S) in the Chilean coastal range. A phylogenetic tree was constructed using three DNA regions to calculate evolutionary indices (PD and PE) and compare them at different taxonomic levels. The results of PD and PE were spatially consistent with those of richness and endemism, but evolutionarily important sites were discovered. PD-derived indices indicate three evolutionary hotspots: a cradle-type site with a predominance of neoendemics (generating recent diversity) at 33°S, three museum-type sites with a predominance of palaeoendemics (maintaining relict diversity) at 30°S, 38°S and 40°S and one with high PD and PE at 37°S. We found evolutionary hotspots within the hotspot of Central Chile with different characteristics. Incorporating measures that consider the evolutionary aspect has important implications for the conservation of highly diverse and endemic areas.

The combined effects of polyethylene microplastics and benzoanthracene on Manila clam Ruditapes philippinarum

Microplastic (MP) toxicity has recently been explored in various marine species. Along with the toxicity of plastics polymer itself, additional substances or pollutants that are absorbed onto it may also be harmful. In the present study, we investigated the combined impacts of polyethylene microplastics (PE MPs) and an organic pollutant (Benzo(a)anthracene, BaA) on Manila clam Ruditapes philippinarum during a one-week exposure. Two PE MPs concentrations (26 μg L−1 and 260 μg L−1) and one BaA concentration (3 μg L−1) were tested. The clams were exposed to BaA and PE MPs either alone or in combination. BaA and PE MPs were incubated before the combined exposure. The biological effects of PE MPs and BaA on the clams were evaluated by considering several assays such as feeding rate, anti-oxidant enzyme activities, and the expression levels of stress-related genes. The feeding rate significantly decreased in individual PE MPs and individual BaA groups while it remained unchanged in combined groups. Superoxide dismutase (SOD) was the most affected among the biochemical parameters. Malondialdehyde (MDA), and glutathione peroxidase (GPx) activities were slightly affected, whereas no changes were observed in glutathione s-transferase (GST) activities. CYP1A1, CYP3A4, and HSP70 gene expressions displayed slightly significant changes. Considering all stressor groups, high PE MPs exposure (260 μg L−1 PE MPs) more effectively altered the biological parameters in the clams compared to individual low PE MPs and BaA exposure, and their combination. The results also indicated the negligible vector role of PE MPs to transport BaA into the clam tissues.

Long term recovery of right ventricular function after treatment of intermediate and high risk pulmonary emboli

IntroductionPulmonary embolism (PE) is a common and significant source of mortality and morbidity worldwide. A subset of patients with PE, particularly those who have intermediate and high risk events, are at increased risk for long-term right ventricular (RV) dysfunction; however, the impact of novel advanced therapies used for acute PE, including catheter-directed intervention, on long-term RV function remains uncertain. We sought to determine whether use of advanced therapies (catheter-directed intervention or systemic thrombolysis) is associated with improved long-term RV function. Materials and methodsRetrospective, single-center cohort study of adult (≥18 year old) patients admitted and discharged alive with a diagnosis of acute PE, who fell under the category of intermediate or high risk, with available follow-up echocardiograms at least 6 months after the index, seen at a single quaternary referral center in Los Angeles, CA between 2012 and 2021. ResultsThere were 113 patients in this study (58 (51.3 %) treated with anticoagulation alone, 12 (10.6 %) treated with systemic thrombolysis, and 43 (38.1 %) treated with catheter-directed intervention), with approximately equal gender and racial distribution. Patients treated with advanced therapies were significantly more likely to have moderate-severe RV dysfunction (100 % for those treated with thrombolysis, 88.3 % for those treated with catheter-directed intervention, vs 55.2 % for those treated with anticoagulation alone; p < 0.001). At a follow-up of about 1.5 years, patients treated with advanced therapy (systemic thrombolysis or catheter-directed intervention) were more likely to have normalization of RV function (93–100 % vs 81 % for anticoagulation alone, p = 0.04). The subgroup of patients with intermediate-risk PE was significantly more likely to have normalization of RV function (95.6 % vs 80.4 % for anticoagulation alone, p = 0.03). Use of advanced therapy was not associated with substantial short-term adverse events among patients who survived to hospital discharge. ConclusionPatients with intermediate and high risk PE were more likely to have recovery in RV function long-term if treated with catheter-directed intervention or systemic thrombolysis, as compared to anticoagulation alone, without substantial safety issues, despite having worse RV function at baseline. Further data is needed to verify this observation.

DyNNamic: Dynamically Reshaping, High Data-Reuse Accelerator for Compact DNNs

Convolutional layers dominate the computation and energy costs of Deep Neural Network (DNN) inference. Recent algorithmic works attempt to reduce these bottlenecks via compact DNN structures and model compression. Likewise, state-of-the-art accelerator designs leverage spatiotemporal characteristics of convolutional layers to reduce data movement overhead and improve throughput. Although both are independently effective at reducing latency and energy costs, combining these approaches does not guarantee cumulative improvements due to inefficient mapping. This inefficiency can be attributed to (1) inflexibility of underlying hardware and (2) inherent reduction of data-reuse opportunities of compact DNN structures. To address these issues, we propose a dynamically reshaping, high data-reuse PE array accelerator, namely <i>DyNNamic</i> . DyNNamic leverages kernel-wise filter decomposition to partition the convolution operation into two compact stages: Shared Kernels Convolution (SKC) and Weighted Accumulation (WA). Because both stages have vastly different dimensions, DyNNamic reshapes its PE array to effectively map the algorithm to the architecture. The architecture then exploits data-reuse opportunities created by the SKC stage, further reducing data movement with negligible overhead. We evaluate our approach on various representative networks and compare against state-of-the-art accelerators. On average, DyNNamic outperforms DianNao by <inline-formula><tex-math notation="LaTeX">$8.4\times$</tex-math></inline-formula> and <inline-formula><tex-math notation="LaTeX">$12.3\times$</tex-math></inline-formula> in terms of inference energy and latency, respectively.

Dysregulation of Mycobacterium marinum ESX-5 Secretion by Novel 1,2,4-oxadiazoles.

The ESX-5 secretion system is essential for the viability and virulence of slow-growing pathogenic mycobacterial species. In this study, we identified a 1,2,4-oxadiazole derivative as a putative effector of the ESX-5 secretion system. We confirmed that this 1,2,4-oxadiazole and several newly synthesized derivatives inhibited the ESX-5-dependent secretion of active lipase LipY by Mycobacterium marinum (M. marinum). Despite reduced lipase activity, we did not observe a defect in LipY secretion itself. Moreover, we found that several other ESX-5 substrates, especially the high molecular-weight PE_PGRS MMAR_5294, were even more abundantly secreted by M. marinum treated with several 1,2,4-oxadiazoles. Analysis of M. marinum grown in the presence of different oxadiazole derivatives revealed that the secretion of LipY and the induction of PE_PGRS secretion were, in fact, two independent phenotypes, as we were able to identify structural features in the compounds that specifically induced only one of these phenotypes. Whereas the three most potent 1,2,4-oxadiazoles displayed only a mild effect on the growth of M. marinum or M. tuberculosis in culture, these compounds significantly reduced bacterial burden in M. marinum-infected zebrafish models. In conclusion, we report a 1,2,4-oxadiazole scaffold that dysregulates ESX-5 protein secretion.

Fluorine and hydroxyl containing unsymmetrical a-diimine Ni (II) dichlorides with improved catalytic performance for ethylene polymerization

A series of new tailored a-diimine Ni (II) complexes (Ni-OH, Ni-FOH, Ni-PhOH, and Ni-PhFOH) containing bulky ortho-N-aryl groups with various dibenzhydryl substitutes was successfully synthesized, characterized and applied in ethylene polymerization. The a-diimine ligands and Ni (II) complexes were characterized by 1H, 19F, and 13C NMR, elemental analysis, and high resolution electrospray ionization mass spectrometry (ESI-HRMS). The X-ray crystallographic study of metal complexes Ni-OH, Ni-FOH, and Ni-PhFOH revealed their distorted tetrahedral geometry. An unsymmetrical steric-enhancement design approach was employed to modulate the competition between the monomer insertion and the chain-walking process in ethylene polymerization. This facile design resulted in a high catalytic activity and yielded high molecular weight PE. The catalytic activity of these complexes was optimized by varying the polymerization conditions (temperature, time, and ethylene pressure), use of co-catalysts and variation of the Al/Ni ratio. When activated with modified methylaluminoxane (MMAO), these Ni complexes exhibited the activity as high as 29.1 × 106 g of PE (mol of Ni)−1 h−1), with a molecular weight of 1.81 × 106 g mol−1. Their thermal stability was well pronounced at elevated temperatures; high activity of 2.88 × 106 g of PE (mol of Ni)−1 h−1 and high molecular weight PE (0.86 × 106 g mol−1obtained at 90 °C). PEs with tunable branches and high melting points (127.5 °C) were obtained, which is a typical feature of LLDPE. The incorporation of fluorine atoms on N-aryl groups had a strong positive influence on the catalytic activity of the Ni complexes and favored the chain-growth process in the ethylene polymerization. Surprisingly, the simultaneous presence of terminal hydroxyl group in these complexes did not adversely affect their catalytic activity, while offering the possibility for covalent attachment to the solid supports for future heterogeneous polymerization.

Testing the Vallerand’s Motivational Sequence in Physical Education: The Invariance of Teachers’ Motivation to Teach

The aims of this study were to test the Vallerand's motivational sequence model in physical education and to examine the invariance of the model across PE teachers’ motivation to teach. The study was conducted with 177 high school PE teachers and their 461 students. Motivation to Teach Scale was applied to PE teachers. “Highly intrinsically motivated” and “highly extrinsically motivated” teachers were determined based on the results obtained from this scale. Two highest intrinsically motivated teachers and three highest extrinsically motivated teachers were reached again and their students’ autonomy support, basic psychological needs satisfaction, situational motivation, subjective vitality, and concentration were assessed. Structural equation modelling and Ward invariant analysis were used for the data analysis. Results showed that the more teachers are intrinsically motivated for her profession, the more their students’ autonomy need satisfaction negatively explains their amotivation level in physical education. Perceived autonomy support is the trigger and autonomy need satisfaction is the most important variable in the whole motivational model. Thus, physical education teachers are recommended to create a lesson environment providing autonomy support and considering autonomy need satisfaction to increase students’ well-being.

Prediction of geosynchronous electron fluxes using an artificial neural network driven by solar wind parameters

There are hundreds of satellites operating at the geosynchronous (GEO) orbit where relativistic electrons can cause severe damage. Thus, predicting relativistic electron fluxes is significant for spacecraft safety. In this study, using GOES satellite data during 2011–2020, we propose two neural network models with two hidden layers to predict geosynchronous relativistic electron fluxes at two energy channels (>0.8 MeV and > 2 MeV). The number of input neurons of the two channels (>0.8 MeV and > 2 MeV) are determined to be 36 and 44, respectively. The > 0.8 MeV model has 22 and 9 neurons in the hidden layers, while the > 2 MeV model has 25 and 15 neurons in the hidden layers. The input parameters include the north–south component of the interplanetary magnetic field, solar wind speed, solar wind dynamic pressure and solar wind proton density. Through the analysis of different time delays, we determine that the optimal time delays of two energy channels (>0.8 MeV and > 2 MeV) are 8 days and 10 days, respectively. The training set and validation set (Jan 2011-Dec 2018) are divided by the 10-fold cross-validation method, and the remaining data (Jan 2019-Feb 2020) is used to analyze the model performance as a test set. The prediction results of both energy channels show good agreement with satellite observations indicated by low RMSE (∼0.3 cm-2sr-1s−1), high PE (∼0.8) and CC (∼0.9). These results suggest that only using solar wind parameters is capable of obtaining reasonable predictions of geosynchronous relativistic electron fluxes.

The timing of death in acute pulmonary embolism patients regarding the mortality risk stratification at admission to hospital

Abstract Background The management of patients with acute pulmonary embolism (aPE) depend on the risk stratification at hospital admission. It is unknown when normotensive aPE patients with some other risk factors deteriorate. Patients and methods Patients with objectively established acute PE diagnosis enrolled in the regional PE registry from January 2015 to December 2021, were studied in this investigation. According to European Society od Cardiology criteria patients were stratified during admission to hospital in four risk stratums. The timing for death and the main reason for death were recorded. PE-related death was defined if patient has died because of cardiac arrest or obstructive shock if there is no another possible reason for that. Results In the REPER registry. Among 1541 patients (514 low risk, 366 intermediate-low risk, 472 intermediate-high risk and 189 high risk) with aPE, 101 (6.6%) have died primary from aPE and 64 (4.2%) have died from other reasons during the 30-day follow-up. PE-related death across the mortality risk groups were 0.8%, 1.1%, 8.5% and 28.5% in low-risk, intermediate-low, intermediate-high and high risk PE, respectively. Median time from hospital admission to PE related death was significantly longer in intermediate-high than in high risk patients 4.5 (2.0–9.0) vs 1.0 (1.0–4.5) days, p=0.001. In the high risk group 50.9% of patients died during the first 24 hours, 9.0% in the next 24 hours and 83.0% of patients died during the first 5 days from admission. In the intermediate-high risk group 17.5% died in the first 24 hours, 12.5% died in the next 24 hours and next 25% died till the fifth day. There was no difference in timing of non PE-related death between intermediate-high and high risk patients 9.5 (6.0–18.5) vs 7.0 (3.0–23.5) days, p=0.631. Conclusion There is significant delay in timing of death in intermediate-high compare to high risk PE patients, however, almost 50% of patients who died in the intermediate-high risk PE patients have died inside the first 5 days from hospital admission. Funding Acknowledgement Type of funding sources: None.

EVALUATION OF SERIAL BIOMARKERS IN INTERMEDIATE-RISK PATIENTS WITH ACUTE PULMONARY EMBOLISM

EVALUATION OF SERIAL BIOMARKERS IN INTERMEDIATE-RISK PATIENTS WITH ACUTE PULMONARY EMBOLISM

WHERE ARE YOU GOING: EMERGENCY MANAGEMENT OF A THROMBUS-IN-TRANSIT WITH PERCUTANEOUS MECHANICAL THROMBECTOMY AT A COMMUNITY HOSPITAL

WHERE ARE YOU GOING: EMERGENCY MANAGEMENT OF A THROMBUS-IN-TRANSIT WITH PERCUTANEOUS MECHANICAL THROMBECTOMY AT A COMMUNITY HOSPITAL

Paradoxes in practices of inclusion in physical education.

The purpose of this paper was to explore how high school PE teachers create norms for inclusion based on gender as it intersected with ethnicity, ability, and effort.

A 3D Monte Carlo Simulation of Convective Diffusional Deposition of Ultrafine Particles on Fiber Surfaces

The microscale simulation of ultrafine particle transport and deposition in fibrous filtration media was achieved with a novel particle tracking model using a 3D Monte Carlo model. The particle deposition process is governed by the convection–diffusion field. Simulations were performed by considering the fibrous filtration media as an array of identical parallel fibers, in which the flow field was accurately described by an analytical solution. The model of particle movement was described by the random probability distribution characterized by a dimensionless factor, the Peclet number (Pe), based on a convection–diffusive equation of particle transport in fluid. The influence of the particle Peclet number (Pe) on the particle deposition process and the resulting deposition morphology was investigated. The results were analyzed in terms of dust layer growth, particles’ trajectories and dust layer porosity for a vast range of Peclet numbers. The development of distinct deposition morphologies was found by varying the Peclet number (Pe). With a small Peclet number, diffusion dominated deposition and led to the formation of a more open and looser dust layer structure, while with larger Peclet numbers, convection dominated deposition and was found to form compact deposits. According to the change in the location of the packing densities along the dust layer height direction, the dust layer structure could be divided into three typical parts: the substructure, main profile and surface layer. In addition, the deposit morphologies observed for a high Pe were in good agreement with the experimental results found in the literature.

A new insight into Cd reduction by flooding in paddy soil: The different dominant roles of Fe and S on Cd immobilization under fluctuant pe + pH conditions

The unsteady comprehensive system of pe + pH strongly affects the fate of Cd in paddy soils. However, the specific pe + pH threshold determining Cd bioavailability is largely unknown especially considering the roles of Fe and S reduction. The experiment set different water managements to obtain paddy soil samples with unstable pe + pH, and chemical analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) characterization were applied to reveal the dynamic process and mechanism about how Fe and S controlled Cd mobilization. The results showed that low pe + pH was favorable to soil Cd immobilization. Compared with high and medium pe + pH, the exchangeable Cd content decreased by 67.57 % and 64.71 % at low pe + pH, respectively. The XPS results showed that the contents of Fe(II) and S(−II) increased to 65.1 % and 75.2 % at low pe + pH condition, which was higher than that in other treatments. In the process of flooding for reducing Cd mobility, first it was attributed to the formation of amorphous iron oxides that can provide amount of adsorption sites for Cd. After then, S2− began to play a dominant role to combine with Cd2+ to form CdS with continuous decreased pe + pH. Therefore, Fe and S played the different dominant roles on Cd immobilization in paddy soil, and soil pe + pH value could work as a threshold.

Morphological and Physiological Indicators for Screening Cell Lines with High Potential for Somatic Embryo Maturation at an Early Stage of Somatic Embryogenesis in Pinus Koraiensis.

Many cell lines in the embryogenic callus cannot produce somatic embryos (SEs) even if they meet the optimal SE maturation culture conditions during conifer somatic embryogenesis. This phenomenon hinders the progress of the industrial-scale reproduction of conifers. Therefore, there is an urgent need to obtain morphological and physiological markers to screen embryogenic calli in response to SE maturation conditions. To detect cell lines with high somatic embryogenesis potential during the proliferation process, we counted the number of pro-embryos and early SEs (ESEs) in different cell lines and storage substances, endogenous hormones, and polyamine contents. The results showed that the yield of P. koraiensis SEs was heavily dependent on genotype (p = 0.001). There were high levels of PE III (pro-embryo III) number, ESE number, and soluble protein content, in the response cell lines (R cell lines), which were 1.6-, 3-, and 1.1-fold those of the obstructive cell lines (B cell lines), respectively. The B cell line had high levels of starch, auxin (IAA), Put, Spd, and putrescine: spermine (Put: Spm) compared to the R cell line. In addition, the numbers of PE III, ESEs, and soluble protein content were significantly positively correlated with SE yield. In contrast, the contents of starch, abscisic acid (ABA), Put, Spm, and Spd were significantly negatively correlated with SE yield. To ensure the accuracy of the results, we used nine cell lines to test the results. The PE III and ESE numbers and the Spm and Spd contents were positively correlated with SE yield, while the levels of starch, ABA, IAA, Put: Spd, and Put: Spm were negatively correlated with SE yield. Thus, we recommend using high PE III and ESEs as morphological indicators and low levels of starch, IAA, ABA, and Put: Spm as physiological markers to screen cell lines with a high somatic embryogenesis potential. In addition, we also found that the relationship between Spd, Spm, and SE yield was opposite in the two experimental results. Therefore, we speculate that the differences in Spd and Spm content are mainly affected by genotype. In conclusion, this study obtained the morphological and physiological markers of some high-somatic embryogenic cell lines by comparing the differences between nine somatic embryogenic cell lines. Our results can guide the improvement of conifer somatic embryogenesis technology and can provide a theoretical basis for accelerating the application of biotechnology in large-scale artificial breeding.

The powerful, the powerless, and the empowered: Visualizations of power in high school and university through social network analysis

The investigation uses Popitz’s power theory (1992) to examine relationships among social power position, attractiveness, and verbal aggressiveness comparing social networks of high school and university students. 117 high school PE students and 195 university PE students participated in the research completing both a network and a joint non-network questionnaire. Visone 1.1 software was used for the processing of the network data and SPSS 26 was implemented for the non-network data. The results revealed in both settings that students demonstrating scientific/task attractiveness develop authoritative power/power of internalized control in their network and are protected from verbal aggressiveness and enforcement of instrumental power/power of externalized control. Social attractiveness enhances the development of authoritative power/power of internalized control in high school only. In this research, a type of powerful student is suggested who does not tend to concentrate power but rather to share power for empowering the powerless ones.