Extreme Threat Research Articles

Poly-γ-glutamic acid chelates chromium (III) and copper (II), alleviating their toxicity in cucumber and affecting rhizosphere bacterial community assembly.

The accumulation of chromium (Cr) and copper (Cu) in soil during industrialization and modernization poses an extreme threat to crops. Poly-γ-glutamic acid (γ-PGA) has the potential to stabilize heavy metals in soil through chelation because of the numerous carboxyl groups in its side chain. The rhizosphere microbiome contributes to plant detoxification by participating in heavy metal passivation. However, it is still unclear whether γ-PGA can alleviate the toxicity of Cr and Cu to plants and whether this effect is associated with changes in the rhizosphere microbiome assembly. Here, we found that γ-PGA application significantly reduced the content of Cr or Cu in cucumber plants by 67.45%-86.77% and 94.67%-98.21, respectively, and alleviated the oxidative stress of Cr or Cu to plants. Moreover, γ-PGA significantly increased the biomass of cucumber fruits in the plot experiment by 13.5% and 25.3% under Cr and Cu stress, respectively. The content of Cr or Cu in the cucumber fruit was below limits of detection, in contrast to the 31.23 mg/kg Cr or 9.86 mg/kg Cu detected in the no-γ-PGA treatment. γ-PGA effectively chelated Cr and Cu in vitro, and less than 30% of their chelates were degraded in 20 weeks, suggesting the strong stability of these chelates. γ-PGA significantly altered the rhizosphere bacterial community composition of cucumber by enriching phyla Gemmatimonadota, Acidobacteriota and Firmicutes, and genera Gemmatimonas and Stenotrophomonas, which potentially involved in reducing the mobility of Cr and Cu in soils. Furthermore, γ-PGA significantly enriched taxa assigned to plant growth-promoting bacteria (PGPB). Together, our results suggest that γ-PGA can reduce the Cr and Cu contents in cucumber, and this process is strongly associated with the chelation capacity of γ-PGA and its effects on rhizosphere microbiome composition. These results highlight the exciting potential to use γ-PGA for the remediation of heavy metal-contaminated soils.

Identification of genetic loci for powdery mildew resistance in common wheat.

Powdery mildew (PM) poses an extreme threat to wheat yields and quality. In this study, 262 recombinant inbred lines (RILs) of Doumai and Shi 4185 cross were used to map PM resistance genes across four environments. High-density genetic linkage map of the Doumai/Shi 4185 RIL population was constructed using the wheat Illumina iSelect 90K single-nucleotide polymorphism (SNP) array. In total, four stable quantitative trait loci (QTLs) for PM resistance, QPm.caas-2AS, QPm.caas-4AS, QPm.caas-4BL, and QPm.caas-6BS, were detected and explained 5.6%-15.6% of the phenotypic variances. Doumai contributed all the resistance alleles of QPm.caas-2AS, QPm.caas-4AS, QPm.caas-4BL, and QPm.caas-6BS. Among these, QPm.caas-4AS and QPm.caas-6BS overlapped with the previously reported loci, whereas QPm.caas-2AS and QPm.caas-4BL are potentially novel. In addition, six high-confidence genes encoding the NBS-LRR-like resistance protein, disease resistance protein family, and calcium/calmodulin-dependent serine/threonine-kinase were selected as the candidate genes for PM resistance. Three kompetitive allele-specific PCR (KASP) markers, Kasp_PMR_2AS for QPm.caas-2AS, Kasp_PMR_4BL for QPm.caas-4BL, and Kasp_PMR_6BS for QPm.caas-6BS, were developed, and their genetic effects were validated in a natural population including 100 cultivars. These findings will offer valuable QTLs and available KASP markers to enhance wheat marker-assisted breeding for PM resistance.

Changes in endangered hornbill populations over space and time and potential ecological impacts in peninsular Thailand

Hornbills are particularly important seed dispersers in tropical Asian forests, but most of the species in the region are declining. In addition, long-term data on the extent of the declines and how forest degradation impacts hornbills remain mostly unquantified. Here, we used multi-covariate distance sampling to estimate the densities of hornbills in 2021–2022 in Hala-Bala Wildlife Sanctuary and Budo Su-Ngai Padi National Park protected areas in southern Thailand. These two sites are particularly useful for comparison due to differences in protection levels, with Bala being relatively less disturbed than Budo Mountain and because Bala was surveyed 20 years prior (2001–2002). Fig tree watches were also conducted in 2021–2022 to assess the potential impact of forest disturbance on hornbill visitation rates. Results indicated significant differences in hornbill densities between the two sites. The mean density of the Rhinoceros (Buceros rhinoceros) and Wreathed Hornbill (Rhyticeros undulatus) was 3.2 and 5.1 times higher in Bala than in Budo, while the mean density of the Great Hornbill (Buceros bicornis) was 2.2 times higher in Budo than in Bala. The density of the Helmeted Hornbill (Rhinoplax vigil) was notably lower than other hornbill species. There were also significant changes over the past 20 years in large hornbill densities, with Great Hornbill and Wreathed Hornbill significantly increasing, while the Helmeted Hornbill declined more than 90 %. Also, the probability of hornbills visiting fruiting Ficus trees was higher in the less-disturbed Bala than the Budo Mountain, making hornbills more reliable visitors in the less-disturbed site. We demonstrate the applicability of the multi-covariate distance sampling approach to estimate densities of rare hornbills, the negative impacts of habitat degradation on hornbills and the ecological role they play as seed dispersers. Additional surveys are needed throughout tropical Asia to establish further sites for long-term monitoring, especially in the Sunda region, where the Helmeted Hornbill is under extreme threat.

A story of becoming a horticultural threat, cypress jewel beetle Lamprodila festiva (Coleoptera, Buprestidae): analytical approach of its European escalation based on bibliographical sources

The cypress jewel beetle, Lamprodila festiva, as one of the most destructive local invasive pests in Europe is currently an extreme threat to the coniferous Cupressaceae trees. The beetle spread at an unprecedented pace and intensity and poses a threat to many countries. Our study aimed to map the Palearctic distribution of L. festiva and measure the dispersal's pace and directions. Besides, one of our goals was visualising the adult’s seasonal activity and their host plant choice preference. A meta-analytical assessment was carried out to answer these questions based on the related bibliographical sources available in scientific databases. Our results confirmed that L. festiva has spread with extraordinary speed and success across the western Palaearctic areas, where the consequences of global warming have provided optimal conditions. The first population successful reproduction was started at five well-differentiated natural reserve areas across Europe in a latent manner. The flight season of L. festiva typically occurs from May to July, with the peaks varying depending on the area of distribution. Our studies have shown that L. festiva is a typical oligophagous pest, favouring certain species within its range of host plants. Thus, the genera Thuja, Platycladus and Juniperus species are most affected by its damage. Starting from its exceptional distribution characteristics, realising biological explanatory and applied protection research related to this species can become an urgent expectation in the future.

Preparing for a Bsal invasion into North America has improved multi-sector readiness

Western palearctic salamander susceptibility to the skin disease caused by the amphibian chytrid fungus Batrachochytrium salamandrivorans (Bsal) was recognized in 2014, eliciting concerns for a potential novel wave of amphibian declines following the B. dendrobatidis (Bd) chytridiomycosis global pandemic. Although Bsal had not been detected in North America, initial experimental trials supported the heightened susceptibility of caudate amphibians to Bsal chytridiomycosis, recognizing the critical threat this pathogen poses to the North American salamander biodiversity hotspot. Here, we take stock of 10 years of research, collaboration, engagement, and outreach by the North American Bsal Task Force. We summarize main knowledge and conservation actions to both forestall and respond to Bsal invasion into North America. We address the questions: what have we learned; what are current challenges; and are we ready for a more effective reaction to Bsal’s eventual detection? We expect that the many contributions to preemptive planning accrued over the past decade will pay dividends in amphibian conservation effectiveness and can inform future responses to other novel wildlife diseases and extreme threats.

Comparing the Effect of Internet-Delivered Interpersonal Psychotherapy and Compassion-Focused Therapy on the Quality of Life and Grief Experience of First-Degree Relatives of the Deceased Due to COVID-19

Background: The COVID-19 pandemic presents an extreme threat to global health and stands as one of the leading causes of death worldwide. Loss, as a broader theme, intertwines with various aspects of people’s lives during these challenging times. Failing to address the urgent needs of individuals experiencing loss and grief can result in poor mental and physical health. Objectives: Our study aimed to evaluate the impact of interpersonal psychotherapy (IPT) and compassion-focused therapy (CFT) on the grief and quality of life (QoL) of first-degree relatives who lost loved ones due to the COVID-19 pandemic. Methods: This study was a randomized clinical trial. Participants who had lost a family member to COVID-19 between March 2019 and September 2020 and who visited the hospitals affiliated with Isfahan University of Medical Sciences were selected based on specific inclusion and exclusion criteria. Forty participants were randomly assigned to either IPT or CFT, and each group underwent 6 weekly sessions. The Grief Experience Questionnaires and the World Health Organization’s Quality of Life Questionnaires were administered to all individuals via phone interviews before commencing treatment and 1 month after completing the sessions. Results: The results indicated a significant improvement in both treatment groups individually (P < 0.001). However, when comparing the 2 groups while adjusting for the pre-test effects, there were no significant differences between them in any of the following areas: Physical response (P2 = 0.45), notoriety (P2 = 0.53), justification and coping (P2 = 0.59), guilt (P2 = 0.31), feelings of abandonment (P2 = 0.52), judgment by others (P2 = 0.78), and embarrassment and shame (P2 = 0.79). Conclusions: The findings from our study demonstrate that both IPT and CFT resulted in improved QoL and reduced grief experiences. Therefore, these therapeutic approaches can be employed to alleviate grief symptoms and enhance overall QoL.

Ultrasensitive detection of aromatic water pollutants through protein immobilization driven organic electrochemical transistors.

Xenobiotic aromatic water pollutants pose an extreme threat to environmental sustainability. Due to the lack of detectable functional groups in these compounds and scarcity of selective bio-recognition scaffolds, easy-to-use sensing strategies capable of on-site detection remain unavailable. Herein, to address this lacune, we entail a strategy that combines biosensor scaffolds with organic electronics to create a compact device for environmental aromatic pollution monitoring. As proof of principle, a sensor module capable of rapid, economic, reliable, and ultrasensitive detection of phenol down to 2 ppb (0.02 μM) was designed wherein biosensing protein MopR was coupled with an organic electrochemical transistor (OECT). For effective interfacing of the sensing scaffold MopR, graphene oxide (GO) nanosheets were optimized as a host immobilization matrix. The MopR-GO immobilized sensor module was subsequently substituted as the gate electrode with PEDOT:PSS serving as an organic semiconductor material. The resulting OECT sensor provided a favourable microenvironment for protein activity, maintaining high specificity. Exclusive phenol detection with minimal loss of sensitivity (<5% error) could be achieved in both complex pollutant mixtures and real environmental samples. This fabrication strategy that amalgamates biological biosensors with organic electronics harnesses the potential to achieve detection of a host of emerging pollutants.

Testing previously proposed models of the Tonic Immobility Scale in a peritraumatic sample of Israeli civilians: Support for a three-factor model.

Tonic immobility (TI) is a peritraumatic response to extreme threats. It is associated with trauma psychopathology and poor treatment outcomes. Yet, previous psychometric evaluations have yielded inconsistent results regarding the number of latent factors of the Tonic Immobility Scale (TIS). Moreover, the TIS has never been validated in a Hebrew-speaking population. This study had two objectives: (a) to reassess previously proposed models of the TIS to determine whether it is best represented by a one-factor model of TI, a two-factor model of TI and fear, or a three-factor model of TI, fear, and detachment; and (b) to validate the TIS in a Hebrew translation. A sample of Israeli adults was culled from an online survey following rocket attacks. Confirmatory factor analysis was applied to test the previously proposed models, and Pearson's correlations were used to test the association between each of the subscales representing the latent factors and psychological distress. The best representation of the data was provided by a three-factor model with latent constructs of TI, fear, and detachment. All three peritraumatic responses had significant correlations with peritraumatic distress. Moreover, the internal consistency of the TIS was good for the three subscales; this supports the reliability of the Hebrew version. This study supports using a three-factor model with latent constructs, and the scale appears to be psychometrically sound when translated into Hebrew. Future research should seek to replicate these findings in different trauma populations and should study the unique association of trauma symptomatology. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Indicator-based assessment of extreme threats (XTs) and their impacts on the resilience of geographical areas and critical infrastructures

Indicator-based assessment of extreme threats (XTs) and their impacts on the resilience of geographical areas and critical infrastructures

Using river restoration model to control riverbank erosion in the Old Brahmaputra river of Bengal Basin, Bangladesh

River meandering causes riverbank erosion, which triggers socioeconomic and environmental issues in the riparian region and raises river sedimentation, thus, needing river restoration. This research depicts a channel restoration model to control river bank erosion and susceptible resource management along the Old Brahmaputra River course based on channel characteristics from 1980 to 2021. The secondary data of Landsat satellite time series and SRTM images were collected from the USGS website, while we used Google Earth images to verify the morphological features. Satellite images were on-screen visualized by ArcMap (10.3) to extract the river channels and measure the erosion and accretion areas. Results showed that the Old Brahmaputra River channel shifted its position due to erosion and accretion. Over the last forty-one years, ∼ 52 km2 area was eroded while ∼ 49 km2 area was accreted, and the average shifting of the river channel was 1.3 km2 per year. Accordingly, the river channel has become more sinuous decade by decade and threatens nearby settlements. Hence, this study proposed a river channel based on previous river channels, where the base channel is from the 2000s, which was more stable and flowed through the middle of the floodplain. Parts of the 1980, 2000, and 2021 river channels were also selected, which are relatively far from the susceptible settlements, to draw the proposed restoring channel. This model is likely to aid in developing government strategies for protecting riverbank erosion and river restoration in the forthcoming period. Finally, this study recommends that this newly proposed channel will be conducive to reducing riverbank erosion and the extreme threat to the settlements and their livelihoods.

Exfoliation and physico-chemical characterization of novel bioplasticizers from Nelumbo nucifera leaf for biofilm application

Due to the extreme threats as environmental and health issues caused by the petroleum-based leachable plasticizers, researchers among different domains are more interested in finding unique biodegradable plasticizers from natural sources. The present study used Nelumbo nucifera leaf to extract novel biopolymers as viable substitutes for chemical plasticizers. The biopolymers extraction was carried out through chemical means and its physico-chemical and morphological characterization were carried out to confirm its plastic nature. The polymers extracted possess a low glass transition temperature (77.17 °C), good thermal stability (230 °C), low density (0.94 g/cc), good surface roughness (34.154 μm), low crystallinity index (25.1%) and moderate crystallite size (16.36 nm). The presence of an organic polymer with specific chemical groups as olefinic alkenes, epoxide, imino/azo groups, and hydrophobic organic siloxane groups, signify that the material is a condensed phenolic derivative. Furthermore, bio-film was formulated using NLP and poly lactic acid (PLA) matrix to evaluate its plasticizing effect and film-forming ability. Variation in specific properties of film was noted after bio-plasticizer addition, where tensile strength (20.94 ± 1.5 MPa to 19.22 ± 1.3 MPa) and Young's modulus (1.462 ± 0.43 GPa to 1.025 ± 0.52 GPa) was found to be decreased whereas increased the percentage of elongation at break (26.30 ± 1.1% to 39.64 ± 1.6%). In addition, decreased glass transition temperature (Tg) (59.17 °C), good surface compatibility, and increased flexibility of NLP-PLA film in contrast to pure PLA film authorizes the plasticizing effect of bio-plasticizers on PLA. Since the extracted bio-plasticizers could be a suitable replacement to harmful synthetic plasticizers for lightweight packaging applications in bioplastics sector.

Correlations of systemic blood cytokines in patients with coronary heart disease and experienced COVID-19

Coronavirus infection brings an extreme threat to older people and particularly to patients with severe cardiovascular pathology, including coronary heart disease (CHD). Recovery in these patients largely depends on the severity of cytokine disorders in the acute phase of the disease, since they negatively affect cardiomyocytes, including those through the development of complications in other organs and systems. However, changes in the plasma cytokines of elderly patients with CHD who have experienced COVID-19 have not been studied in practice. Objective. To study the correlations of plasma cytokines in older patients with CHD in the early recovery stages after COVID-19. Subjects and methods. The investigation enrolled 40 elderly patients with CHD at weeks 3-4 following recovery from COVID-19 and 38 patients of the same age with CHD without COVID-19 in their history. The fasting plasma cytokine level was determined using a Becton Dickinson FACS Canto 2 apparatus (USA) in the morning. The relations between the cytokines were studied by the correlation method. Results. Interleukin (IL)-6 showed the greatest number of significant correlations (direct weak and medium associations with other cytokines), including a direct statistically significant average correlation with IL-17 (r=0.63), tumor necrosis factor-α (TNF-α) (r=0.42), interferon-γ (IFN-γ) (r=0.39), IL-2 (r=0.35), IL-3 (r=0.33), as well as a weak significant relationship to IL-7 (r=0.29). IFN-γ had three direct significant correlations with IL-6 (r=0.39), IL-7 (r=0.36), and TNF-α (r=0.29). The latter showed two direct average significant correlations with IL-6 and IL-17. Conclusion. In the early stages of recovery, in 60–74-year old patients with CHD after experienced COVID-19, IL-6, IFN-γ, and TNF-α cytokines had the greatest conjugacy, which can be used as markers of recovery in this patient cohort.

Genomic insights into the adaptation of Acinetobacter johnsonii RB2-047 to the heavy metal-contaminated subsurface mine environment

The subsurface mine environments characterized by high levels of toxic metals and low nutrient availability represent an extreme threat to bacterial persistence. In recent study, the genomic analysis of the Acinetobacter johnsonii strain RB2-047 isolated from the Rozália Gold Mine in Slovakia was performed. As expected, the studied isolate showed a high level of heavy metal tolerance (minimum inhibitory concentrations were 500 mg/L for copper and nickel, 1,500 mg/L for lead, and 250 mg/L for zinc). The RB2-047 strain also showed noticeable resistance to several antibiotics (ampicillin, kanamycin, chloramphenicol, tetracycline and ciprofloxacin). The genomic composition analysis demonstrated a low number of antibiotic and metal resistance coding genes, but a high occurrence of efflux transporter genes located on the bacterial chromosome. The experimental inhibition of efflux pumps resulted in decreased tolerance to Zn and Ni (but not to Cu and Pb) and to all antibiotics tested. In addition, the H33342 dye-accumulation assay confirmed the high efflux activity in the RB2-047 isolate. These findings showed the important role of efflux pumps in the adaptation of Acinetobacter johsonii strain RB2-047 to metal polluted mine environment as well as in development of multi-antibiotic resistance.

The role of genetic diversity and pre‐breeding traits to improve drought and heat tolerance of bread wheat at the reproductive stage

AbstractExtreme weather including heat waves and drought episodes are expected to increase in intensity and duration due to climate change. Wheat, being a major crop is under extreme threat to these stresses especially at the reproductive stage. This review addresses the potential of diverse wheat germplasm (originated from landraces and synthetic derivatives) to cope with drought and heat stress at the flowering stage. Here, important marker‐trait associations were reported for sustainable grain production under drought and heat stress at anthesis. Likewise, the mechanisms of drought and heat resilience including gene expression and physiological traits (activities of carbohydrate metabolic and antioxidant enzymes, and endogenous hormonal responses) were explored. These studies helped to understand the genetic and physiological basis of drought and heat tolerance and certain pre‐breeding traits related to osmotic adjustment, phytohormonal regulation, antioxidant metabolism, and the expression of novel genes were identified. Moreover, identified pre‐breeding traits and genotypes can be utilized in breeding wheat cultivars resilient to future adverse environments.

Biodegradation of Phenol Using the Indigenous Rhodococcus pyridinivorans Strain PDB9T NS-1 Immobilized in Calcium Alginate Beads.

Phenolic compounds are the major contaminants identified from various industrial effluents, which pose an extreme threat to the environment. Therefore, investigating an effective technique to remove these toxic phenolic compounds from the contaminated environment is very essential. In the present investigation, batch tests were performed to assess the biodegradation of phenol using an indigenous Rhodococcus pyridinivorans strain PDB9T NS-1 encapsulated in a calcium alginate bead system. In order to improve the mechanical stability, silica was added to the cell-embedded Ca-alginate beads. The impact of experimental conditions such as contact time, pH, and initial phenol doses was investigated. The biodegradation of phenol was examined over a wide range of phenol, and the results showed that more than 99.6% degradation was achieved at an initial phenol dose of 1000 mg/L in 70 h at 30 °C. Among the various sorption isotherm tested, the Freundlich isotherm was the best fitted to the experimental data. This behavior indicated a multilayer biosorption process and was controlled by heterogeneous surface energy. Based on an intra-particle diffusion model, internal mass transfer or pore diffusion predominated over exterior mass transfer in controlling the entire phenol biosorption process. The biosorption of phenol onto the cell encapsulated in the Ca-alginate bead follows pseudo-first-order kinetics with a superior phenol biosorption capacity of 155 mg/g of Ca-alginate. Further stability study revealed that the bead could be recycled successfully without any substantial decline in phenol degradation efficiency, indicating that the immobilized microbe possesses exceptional operating stability.

Ethno-pharmacological Evaluation of Plants Resources of District Malakand, Pakistan

Background. The present study was conducted to assess the ethno-pharmacological practices of medicinal plants by the local tribes of District Malakand, Pakistan. The people of the area are mostly poor and rely on local medicinal plants for their basic primary health care needs. During the survey it was perceived that the area is under extreme threat of overgrazing, deforestation and agricultural land expansion and needs urgent and proper ecological management to protect the important medicinal flora for future generations. Methods. The current Ethno-pharmacological study consists of frequent field visits and interviews with 200 local informers of the study area having different socio-economic and educational backgrounds. The information was collected from the indigenous people through interviews and semi- structured questionnaires .The data collected were analyzed with the help of quantitative indices such as Informant consensus factor (Fic) and Fidelity Level (FL%). The plants collected were identified with the help of flora of Pakistan and online plant databases. Results. A total of 130 medicinal plants belonging to 112 genera and 55 families were documented during this survey. The results showed that the plants collected during the survey were predominantly herbs (51%) followed by trees (27%), shrubs (19%) and climbers only (03%). The plants collected were mostly from Ruderal habitat (40%), followed by arable (36%), woodland (18%) and wetland (06%). On the basis of habit the plants collected were mostly Perennials (58%), followed by Annuals (39%) and Biennials only (03%). The majority of the plants used in the preparation of crude drugs were whole plant (33%), followed by leaves (25%), fruits (08%), roots (06%), shoots, flowers, barks, seeds (05%), gum and latex (03%) and bulb (02%) respectively. The highest Fic. values were recorded for cardiovascular and hypertensive diseases (1.0) followed by sore throat and narcotic diseases (0.80). The most important and extensively used species were Allium sativum L., Caralluma tuberculata N.E. Brown and Mentha spicata L. each with 100% FL value. This study showed that the area is gorgeous and rich in medicinal flora. The botanical name, local name, family name, flowering season, part used, and ethno-pharmacological uses of local medicinal plants were documented. Conclusion: During this survey it was observed that the research area District Malakand, Pakistan is rich in medicinal flora and most of the indigenous people are poor and depend on medicinal plants for their basic primary health care needs. The survey showed that medicinal plants were mostly used by the local people to cure of gastrointestinal, skin, mouth, genital, urinary, cold, cough and joint diseases. The study will provide a baseline for further ethno-botanical, ethno-medicinal, phytochemical and antimicrobial studies. Keywords: Medicinal plants, Ethno-pharmacological uses, Gastrointestinal diseases, Malakand, Pakistan.

Digital transformation and strategic agility during the COVID-19 crisis: the role of the intangible capital conversion

PurposeThe purpose of the current study is to illustrate the importance of strategic agility (SA), the capacity to respond agilely to a rapidly changing environment, for digitally transforming firms during the COVID-19 crisis. A secondary purpose of the study is to conceptually frame SA as a function of the creative to realized intangible capital (IC) ratio.Design/methodology/approachTo inferentially corroborate the hypothesis, this study exploits the results of a recent firm-level survey, conducted under the H2020 project GlobalInto (2021). Via OLS and ordered logistic regressions, the relationship among SA, economic performance and IC was tested.FindingsThe exploratory findings implied that the more strategically agile companies were those that responded more effectively to the pandemic crisis, but only if they were ahead in terms of digital transformation. Moreover, the results implied that firms that were able to efficiently convert their creative IC into realized IC were the most strategically agile.Originality/valueThis study developed a new conceptual framework for digitally transforming firms that included the role of SA and the IC conversion ratio in the context of extreme threats to the survival of firms. Some preliminary practical recommendations were offered to management about how to measure the IC conversion ratio as well as how to stimulate and reward greater creativity among employees, filling a notable gap in the SA literature that provides less than precise guidance about how this concept can be measured.

Research Progress and Trend of Agricultural Non-Point Source Pollution from Non-Irrigated Farming Based on Bibliometrics

The agricultural non-point source (NPS) pollution caused by non-irrigated farming, such as heavy metals, nitrogen and phosphorus, has posed an extreme threat to the security of agricultural product quality and watershed ecology. Thus, it is urgent to sort out the latest research progress and future development trend to effectively guide future scientific research and technological updates in this field. This study integrates the relevant literature of the Web of Science from 1976 to 2021 and analyzes the research hotspots and development trends in the field of agricultural NPS pollution from non-irrigated farming in combination with CiteSpace. The results showed that the proportion of publications from the United States and China accounted for 58.4%. Science of the Total Environment, Water Science and Technology and Journal of the American Water Resources Association were the most published journals. The research topics and hotspots mainly involve agricultural NPS pollution prevention technology, pollution source identification, pollution load and management and landscape pattern evolution. In the future, agricultural NPS pollution research in non-irrigated farming should combine agricultural big data platforms, spectroscopic methods, artificial intelligence technology, etc. and focus on strengthening soil testing formula fertilization management, the efficient use of livestock and poultry breeding manure, climate change and risk early warning.

A new fractal index to classify forest fragmentation and disorder

ContextForest loss and fragmentation pose extreme threats to biodiversity. Their efficient characterization from remotely sensed data therefore has strong practical implications. Data are often separately analyzed for spatial fragmentation and disorder, but no existing metric simultaneously quantifies both the shape and arrangement of fragments.ObjectivesWe present a fractal fragmentation and disorder index (FFDI), which advances a previously developed fractal index by merging it with the Rényi information dimension. The FFDI is designed to work across spatial scales, and to efficiently report both the fragmentation of images and their spatial disorder.MethodsWe validate the FFDI with 12,600 synthetic hierarchically structured random map (HRM) multiscale images, as well as several other categories of fractal and non-fractal test images (4880 images). We then apply the FFDI to satellite imagery of forest cover for 10 distinct regions of the Romanian Carpathian Mountains from 2000–2021.ResultsThe FFDI outperformed its two individual components (fractal fragmentation index and Rényi information dimension) in resolving spatial patterns of disorder and fragmentation when tested on HRM classes and other image types. The FFDI thus offers a clear advantage when compared to the individual use of fractal fragmentation index and the Information Dimension, and provided good classification performance in an application to real data.ConclusionsThis work improves on previous characterizations of landscape patterns. With the FFDI, scientists will be able to better monitor and understand forest fragmentation from satellite imagery. The FFDI may also find wider applicability in biology wherever image analysis is used.

Interaction between Cold Atmospheric Plasma Jet and Water Contaminated With Pseudomonas Aeroginosa Bacteria for Decontamination Purpose

Plasma based treatments are found to be effective in water cleansing. For this purpose, we employed a plasma jet that is extracted at the exit of a flexible plastic tube remotely from its main source. This plasma jet is generated using a gas mixture of argon and oxygen for the sake of producing reactive oxygen species in the solution when submerged safely under water to perform a treatment in the suspension volume. The treated samples consist of distillated water that is contaminated with bacterial cells of Pseudomonas aeroginosa, this bacteria can present extreme threat to the human body and may lead to death. Our study reports the effect of both treatment time and the introduced ratio of the gas mixture introduced to ignite the plasma discharge. Results illustrate that full water decontamination can be obtained after about 12 minutes of treatment using 1.5 slpm of argon gas flow in addition to 2.5±0.2% of oxygen.