Antioxidant and Anti-Breast Cancer Properties of Hyaluronidase from Marine Staphylococcus aureus (CASMTK1)

This work studied the antioxidant and anti-breast cancer properties of hyaluronidase, extracted from a potential marine strain, Staphylococcus aureus (CASMTK1), isolated from Parangipettai coastal waters in southeast coast of India. The Staphylococcal enzyme production was tested under different carbon and nitrogen sources;and recorded the maximum production when the microbial strain was cultured with starch as the carbon source and ammonium sulphate as the inorganic nitrogen source with the enzyme production of 92.5 U/mL and 95.0 U/mL, respectively. The hyaluronidase enzyme production was also tested in different pH and temperature;and recorded the maximum yield of 102.5 U/mL in pH 5 and that of 95.5 U/mL in 45 °C. The partially purified enzyme was subjected to FTIR and FT Raman technique and found the presence of the amide- I and II, Carboxyl, N-H bending, C-H stretching and α-helices and β-sheet proteins between wave number 1500–1700 cm−1. The partially purified enzyme also exhibited strong antioxidant and in-vitro breast cancer properties. The enzyme showed the highest hydroxyl radical scavenging activity of 79% at the 50 µg/mL concentration, and this activity increased in a dose-dependent manner. The enzyme inhibited proliferation of the breast cancer cell line of MCF-7, and it caused 100% cell death at the concentration of 80 µg/mL. The enzyme generated capacity of producing free radicles that damage the cancer cells, and this effect was very nearer to the standard drug, paclitaxel. The enzyme damaged the cancer cells and induced apoptosis in 78% of cancer cells as evident by condensed or fragmented chromatin at 40 µg/mL. Further purification of the enzyme, analysis of its molecular aspects, and elucidation of exact mechanisms of its biological activities will throw new light on the utility of staphylococcal hyaluronidase in anticancer chemotherapy.

Sobre la obligatoriedad de las vacunas en tiempos de covid-19: aproximación contextual y análisis desde el Derecho y las políticas comparadas

El trabajo se centra en el estudio de la fundamentación jurídica de las normas que, en Estados Unidos y en los países miembros del Consejo de Europa, establecen la obligatoriedad de las vacunas contra la covid-19 en determinadas circunstancias o para determinados colectivos. La jurisprudencia del Tribunal Supremo, en particular la sentencia Jacobson (1905), y del Tribunal Europeo de Derechos Humanos, singularmente la reciente sentencia Vavricka contra la República Checa (2020), es objeto de particular estudio. En ambas regiones del mundo existe una amplia coincidencia en varios aspectos: la competencia para acordar la obligatoriedad de las vacunas corresponde a los estados;esa obligatoriedad resulta respetuosa con los derechos de los ciudadanos cuando se adopta bajo determinadas circunstancias: riesgo grave de pandemia, existencia de vacunas eficaces y seguras, y ausencia de medidas alternativas menos invasivas. Las normas que establecen la obligatoriedad de la vacuna contra la covid-19 se enmarcan en el conjunto de las políticas públicas sobre vacunas que se han impulsado tanto a nivel estatal como de los organismos intergubernamentales. No se puede entender completamente el alcance de esas normas que obligan a los ciudadanos a recibir la vacuna si no ampliamos previamente el foco de atención y ofrecemos una panorámica de todas las cuestiones controvertidas que ha traído consigo el proceso de desarrollo, autorización, producción, priorización, distribución e información sobre esta vacuna. En cada una de estas cuestiones los estados han ido adoptando distintas posiciones, y frecuentemente lo han hecho con el propósito de reforzar su posición de poder en el contexto internacional. Como en tantas otras ocasiones, los principales actores estatales han sido Estados Unidos, China, Rusia y la Unión Europea. La aproximación somera a dichas controversias nos ilustra acerca del papel crucial que las vacunas contra la covid-19 han tenido y siguen teniendo en las relaciones internacionales: han servido por igual para tejer redes de colaboración, reforzar rivalidades y mantener desigualdades flagrantes.Alternate :The most important and effective action to combat the COVID-19 pandemic, once it was verified that the initial immunity due to contagion or generalized confinements did not solve the problem in the medium term, has been vaccination. The success of vaccines is nothing new. Throughout the history of humankind, vaccines have served to reduce and even eliminate some serious communicable diseases. It is not an exaggeration to say that, together with the purification of water and penicillin, the vaccination of the population against certain diseases is one of the greatest achievements both in the fields of public health and the health of individuals. However, the success of vaccines, not only in this pandemic, but throughout history, has always been in doubt. Despite the evidence of the preventative effect of vaccines, the anti-vaccine movement has endured over time and has even grown in recent decades. Such opposition has not diminished with the efficiency and safe results that the new vaccines against Covid-19 have produced using mRNA technology;on the contrary, it has continued to expand. After the development and authorization of vaccines against covid-19 in record time, the first challenge faced by vaccination campaigns around the world was to determine the priority in access to the resource when the availability of vaccines was still scarce. The criteria followed at this point were, at least in Europe, quite uniform, prioritizing the vaccination of those most in need. That is, the elderly, who are the most prone to suffering serious illnesses. Access to vaccines was very unequal worldwide and, to avoid this, different strategies were proposed, including the suspension of patent rights or the creation of the COVAX vaccine initiative to supply countries that could not buy them. Once a greater number of vaccines were available, and prioritizing access to them was no longer the main ethical-le al issue, the debate arose in many countries about the opportunity to incorporate vaccination as a legal duty. This involved changing the majority opinion in the world;although already the subject of discussion before the pandemic, it was argued to be a moral duty to receive the recommended vaccines to preserve public health and that of others. World public opinion was very attentive to this issue of compulsory vaccination, perhaps due to the rejection that vaccines aroused in certain sectors of the population and, in particular, the vaccine against Covid-19. The discussion about the balance between the freedom of individuals and the achievement of a collective interest as important as public and individual health was resolved at the legal level by the courts of justice. Specifically, the rulings of the Supreme Court in the United States and the European Court of Human Rights in Europe established criteria that were basically convergent. Both courts understand that states have the competency to oblige the population to be vaccinated in order to safeguard their health as long as certain requirements are met: a serious risk of a pandemic, a safe and effective vaccine to combat the disease exists, and the absence of less invasive measures to achieve the same result. These rulings have served to support the specific legal measures that were adopted during the pandemic by both the different states of the United States and the member states of the Council of Europe. Necessarily different concepts have been confused in the debate, in particular those of mandatory and forced vaccination, which do not belong to the same category because they limit different fundamental rights and do so with different levels of intensity. When speaking of mandatory vaccination, reference is made to a duty whose non-compliance determines a legal consequence, be it an economic sanction or a limitation of a right. Thus, the individual who neglects the obligation to be vaccinated will be fined, have their freedom of movement restricted, their working conditions altered or their employment and salary suspended. The legal consequence is not the forced vaccination of those who resist the vaccine, but generally an economic fine. On the contrary, when it comes to forced vaccination, the individual who disregards the obligation will be legally compelled to be vaccinated, resorting even to force if necessary. In other words, the right affected directly by the measure here is the integrity of the individual. These are, therefore, two measures of different significance, from the perspective of the rights ultimately affected by the limitation, and this difference must be taken into account from the principle of proportionality. In this paper we offer an overview of the various responses adopted by different States in relation to whether or not vaccination is mandatory, which have ranged from mandatory for certain groups or even for the entire population. Among those measures of indirect persuasion for vaccination are "covid passports". Our work identifies a broad agreement in the international community on the compatibility between mandatory vaccination and the safeguarding of fundamental rights when certain conditions are met. It is also recognized that proportionality in the adoption of measures is the most effective way to achieve the desired objective of reaching high levels of vaccination in the population. In any case, it would have been desirable to have advanced formulas of persuasion that would have gone beyond information and training, without incurring in the adoption of measures that strongly restrict personal liberty, such as compulsory vaccination. Faced with this international agreement, we do not find shared criteria in other areas related to vaccines: their development and authorization, their fair distribution, or information about them. This absence of shared visions and cooperation gives rise to rivalries that reinforce the traditional clashes between powers. As the purpose of the work is to compare the legal foundations of the mandatory na ure of vaccines in two territories that exert significant influence in other parts of the world, and to do so from a contextual perspective. The work has not attempted to carry out an exhaustive approach to any of the many questions raised, but rather to outline, based on some of the most accredited jurisprudential and doctrinal sources, some provisional conclusions which, at least in some cases, must be subject to successive revisions.

A Review on Current Nanofiber Technologies: Electrospinning, Centrifugal Spinning, and Electro‐Centrifugal Spinning

Nanofiber‐based products are widely used in the fields of public health, air/water filtration, energy storage, etc. The demand for nonwoven products is rapidly increasing especially after COVID‐19 pandemic. Electrospinning is the most popular technology to produce nanofiber‐based products from various kinds of materials in bench and commercial scales. While centrifugal spinning and electro‐centrifugal spinning are considered to be the other two well‐known technologies to fabricate nanofibers. However, their developments are restricted mainly due to the unnormalized spinning devices and spinning principles. High solution concentration and high production efficiency are the two main strengths of centrifugal spinning, but beaded fibers can be formed easily due to air perturbation or device vibration. Electro‐centrifugal spinning is formed by introducing a high voltage electrostatic field into the centrifugal spinning system, which suppresses the formation of beaded fibers and results in producing elegant nanofibers. It is believed that electrospinning can be replaced by electro‐centrifugal spinning in some specific application areas. This article gives an overview on the existing devices and the crucial processing parameters of these nanofiber technologies, also constructive suggestions are proposed to facilitate the development of centrifugal and electro‐centrifugal spinning.

Solar desalination/purification (solar stills, humidification-dehumidification, solar disinfection) in high altitude during COVID19: Insights of gastrointestinal manifestations and systems' mechanism.

From the starting of the pandemic different transmission routes of the pathogen was brought into the spotlight by researchers from different disciplines. This matter in high-altitudes was more boosted as the main parameters were not exactly realized. In this review we are about to highlight the possibility of consuming contaminated water generated form solar water desalination/disinfection systems in highlands. Three systems including solar still, solar disinfection (which experimented by the authors in 2019 in high altitude) and humidification-dehumidification were consider in this context. Ascribe to the risks of pathogens transmission in solar desalination/disinfection systems where the water resources are heavily polluted in every corner of the world, highlighting the risk of consuming water in high-altitude where there are many other parameters associated with spread of pathogen is of great importance. As it was reported, reliability of solar desalination and solar water disinfections systems against contaminated water by the novel coronavirus remained on the question because the virus can be transmitted by vapor in solar stills due to tiny particle size (60-140 nm) and would not be killed by solar disinfections due to low-temperature of operation <40 °C while for HDH contamination of both water and air by sars-cov-2 could be a concern. Although the SARS-CoV-2 is not a waterborne pathogen, its capability to replicate in stomach and infection of gastrointestinal glandular suggested the potential of transmission via fecal-oral. Eventually, it was concluded that using solar-based water treatment as drinking water in high altitude regions should be cautiously consider and recommendations and considerations are presented. Importantly, this critical review not only about the ongoing pandemic, but it aims is to highlight the importance of produced drinking water by systems for future epidemic/pandemic to prevent spread and entering a pathogen particularly in high-altitude regions via a new routes.

An Overview on Exploitation of Graphene-Based Membranes: From Water Treatment to Medical Industry, Including Recent Fighting against COVID-19.

Graphene and its derivatives have lately been the subject of increased attention for different environmental applications of membrane technology such as water treatment and air filtration, exploiting their antimicrobial and antiviral activity. They are interesting candidates as membrane materials for their outstanding mechanical and chemical stability and for their thin two-dimensional (2D) nanostructure with potential pore engineering for advanced separation. All these applications have evolved and diversified from discovery to today, and now graphene and graphene derivatives also offer fascinating opportunities for the fight against infective diseases such as COVID-19 thanks to their antimicrobial and antiviral properties. This paper presents an overview of graphene-based 2D materials, their preparation and use as membrane material for applications in water treatment and in respiratory protection devices.

Structural characterization and anti-inflammatory activity of fucoidan isolated from Ecklonia maxima stipe

Enzyme-assisted hydrolysis is frequendy used as a cost-effective and efficient method to obtain functional ingredients from bioresources. This study involved die enzyme-assisted hydrolyzation and purification of fucoidan from Ecklonia maxima stipe and die investigation of its anti-inflammatory activity in lipopolysaccharide (LPS)-induced RAW 264.7 cells. Fucoidans of Viscozyme-assisted hydrolysate from E. maxima (EMSFs) harvested in Jeju, Korea. Structural and chemical characterizations were performed using fourier transform infrared spectroscopy, scanning electron microscope, and monosaccharide analysis. Among fucoidans, EMSF6 was rich in fucose and sulfate and had a similar structural character to commercial fucoidan. EMSF6 showed a strong inhibitory effect on nitric oxide generation in LPS-induced RAW 264.7 cells and significantly decreased die production of LPS-induced pro-inflammatory cytokines, including interleukin-6, interleukin-1 p, and tumor necrosis factor a. The anti-inflammatory potential of EMSF6 was mediated through the down-regulation of inducible nitric oxide synthase and cyclooxygenase-2 expression. Thus, fucoidans from&temppound;. maxima stipe are promising candidates for functional food products.

Environmental Hazard of Polypropylene from Disposable Face Masks Linked to the COVID-19 Pandemic and Its Possible Mitigation Techniques through a Green Approach

The COVID-19 outbreak again underlined plastic items' importance in our daily lives. The public has widely utilized disposable face masks constructed of polypropylene polymer materials as effective and inexpensive personal protective equipment (PPE) to inhibit virus transmission. The consequences of this have resulted in millions of tons of plastic garbage littering the environment due to inappropriate disposal and mismanagement. Surgical masks are among them, and this study aimed to assess the biodegrading efficiency of disposable face masks using Pseudomonas aeruginosa VJ 1. This work used a bacterial strain, Pseudomonas aeruginosa VJ 1, obtained from sewage water-contaminated surface soil in Tiruchirappalli, India, to investigate the biodegradation of polypropylene (PP) face masks. The mask pieces were incubated with Pseudomonas aeruginosa VJ 1 culture in three different solid and liquid media for 30 days at 37°C. Surface changes and variations in the intensity of functional groups and carbonyl index variations were confirmed using Field Emission Scanning Electron Microscopy (FE-SEM) and Fourier Transform Infrared Spectroscopy (FTIR) analysis to ensure microbial degradation (up to 5.37% weight reduction of PP films within 30 days). These findings show that Pseudomonas aeruginosa VJ 1 could be a good choice for biodegrading PP masks without harming our health or the environment. There is a need for a novel solution for the degradation of PP. The methods and strain presented here reveal the potential biodegrading agents of PP masks. [ FROM AUTHOR] Copyright of Journal of Chemistry is the property of Hindawi Limited and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full . (Copyright applies to all s.)

Eradication push urged as Guinea worm cases fall

Speed read Guinea worm cases fell in 2021 by 48 per cent from 27 to 14 Community-based interventions proved effective, despite COVID-19 Final push needed to achieve full eradication – Carter Center The number of human cases of Guinea worm disease halved in 2021 to a record low of 14, putting the goal of global eradication in sight, the US-based Carter Center has announced. According to the World Health Organization (WHO), Guinea worm disease is not usually fatal, but people suffering from it become “non-functional” for weeks and months. Adam Weiss, director of the Carter Center’s Guinea worm eradication programme, told SciDev.Net: “In the face of a global pandemic, volunteers and local staff carried out household visits to provide health education, distribute filters, and protect water sources from being contaminated.

From Guidance to Implementation: Applying ASHRAE Epidemic Task Force Building Readiness Strategies in 95 Commercial Office Buildings

During the COVID-19 pandemic, building owners and operators sought to protect their occupants by following ASHRAE and CDC guidance for HVAC and water system risk mitigation. This paper presents the results of building readiness assessments conducted for 95 commercial office buildings across the United States. In these assessments, the authors evaluated buildings for initial alignment with ASHRAE Epidemic Task Force (ETF) guidance and recommended action where additional risk mitigation measures were warranted. The engineering assessments focused on outdoor air ventilation rates, filtration efficiency levels, flushing spaces during unoccupied periods, and Eegonella water management practices. Primary challenges to implementing ETF guidance included resistance to operational changes with potential adverse energy impacts, concerns regarding existing system limitations, and in a limited number of cases, ventilation system design constraints. The assessments showed that most of the office buildings could modify their HVAC and water system operatingpractices to minimize the spread of harmful pathogens without major upgrades to equipment or significant increases in energy use. Almost all subject buildings had the capacity to meet or exceed minimum ventilation rates, upgrade to at least MERV-13 filters, implement appropriate flushing periods to achieve target clean air changes, and manage their water systems to minimize Legionella risk.

Modeling Surface Air Pollution with Reduced Emissions during the COVID-19 Pandemic Using CHIMERE and COSMO-ART Chemical Transport Models

The results of numerical modeling of air pollution using CHIMERE and COSMO-ART chemical transport models are presented. The modeling was performed according to the scenarios of the 50–60% reduction of emissions from anthropogenic sources in the Moscow region during the period of March–July 2020. Scenario calculations of pollutant concentrations were compared with baseline simulations using regionally adapted inventory of anthropogenic pollutant emissions to the atmosphere. The most significant decrease in the concentrations of NO2 and CO was reproduced by the models when emissions from two sectoral sources (vehicles and nonindustrial plants) were reduced. The PM10 drop was mostly influenced by the reduction of emissions from industrial combustion. With the total reduction of emissions from anthropogenic sources as compared to the baseline calculations, the pollutant concentration decreased by 44–54% for NO2, by 38–44% for CO, and by 26–39% for PM10. This generally coincides with the quantitative estimates of the pollution level drop obtained by other authors. The greatest effect of reducing pollutant emissions into the atmosphere was found during the episodes of adverse weather conditions for air purification, when the simulated and observed pollution level increases by 3–5 times as compared to the conditions of intense pollutant dispersion.

Direct Sunlight Driven In2S3 Thin Film Based Water Treatment Proto-Type

A multi-faceted energy intensive technology that can be used for water disinfection and synthesis of electrolysed water (EW) is the need of the hour to achieve a sustainable post COVID 19 water management strategy. Direct sunlight driven processes are legislatively green technologies and hold the key in environmental sustenance. The development of a laboratory proto type reactor powered by a photovoltaic module for the treatment open source river water is described in this paper. This paper reports on the efficacy of the developed proto type technology for multipurpose application namely: (1) the production of Electrolysed water (EW) in a cost efficient manner using direct sunlight and (2) the removal of organic impurity from water using direct sunlight without the use of any photo catalyst or membrane. The prototype reactor utilizes chemical spray pyrolysis deposited highly photo-conducting indium sulphide thin films grown on fluorine doped tin oxide (F:SnO2) substrate (coated using chemical spray pyrolysis technique in-house) as the photo electrode. Dissolved organic matter arising in river water has distinctive fluorescence properties, and this research has utilized it to identify dissolved organic substances in both random samples and treated water. The work proves that photovoltaic module powered electrolytic reactors consisting of In2S3 electrodes can be used for treatment of river water. A diaphragm free, energy intensive route for the production of electrolysed water with the use of non-hazardous NaCl as the electrolyte has been demonstrated here. We conclude that In2S3 electrodes can be used for non-photo catalytic reduction of humic-derived impurities in river water. These results are also encouraging on the prospects of treating Nitrates present in the river water. The likes of techniques as described in this report that do not use photo catalyst or membranes may pave way for real time photovoltaic module powered floating reactors that can decontaminate water bodies on a large scale. The technique used by us demonstrates that a chlorine free route can be optimized for the synthesis of EW eliminating the production of large amounts of wastewater with high levels of biological oxygen demand (BOD).

Barriers to Water and Sanitation Safety Plans in Rural Areas of South Africa—A Case Study in the Vhembe District, Limpopo Province

The implementation of water and sanitation safety plans (WSSP) has the potential of greatly improving the challenge of resource-limited drinking-water supplies. However, the most effective tool to make WSSP successful is understanding of the factors that contribute to hindering the implementation of these plans, specifically in rural communities. This study therefore aimed at assessing the status of basic services and determining the factors that contribute to hampering the process of WSSP in rural communities. A survey was conducted between March 2020 and March 2021 in rural communities of the Vhembe District, Limpopo Province, South Africa. The overall results indicate that poverty, unemployment, lack of access to purified water, and inadequate sanitation facilities have resulted in waterborne diseases reported within the communities and have a major impact in hindering WSSP. Other barriers observed are inequality regarding financial power, absent and degrading water and sanitation infrastructures, and lack of protection and maintenance of natural water sources. Therefore, there is a need for community members to be educated on proper behavior and perceptions towards sanitation, including working hand-in-hand with different stakeholders, men and women from communities, and different cultures and religions to overcome these barriers, so that human disease associated with water supply, wastewater reuse, and sanitation in rural communities can be alleviated.

Heterogeneous Catalysis and Advanced Oxidation Processes (AOPs) for Environmental Protection (VOC Oxidation, Air and Water Purification)

The developments of eco-friendly catalysts and unconventional photocatalysts, not based on TiO2, which can also represent possible solutions to the crisis of the raw material exportation [5] was also explored in two other papers of this Special Issue [6,7];the good catalytic, photocatalytic, and phothermo-catalytic properties of MnOx-ZrO2 are presented, making these composites a promising future choice, as an example of an economical, not-critical, and high-performing catalyst applied for the removal of some dangerous VOCs such as toluene. [...]the Fenton and photo-Fenton-like processes were proposed to remove other water pollutants such as pesticides [13] and rhodamine B dye [14], using alternative catalysts such as reduced CeO2 [13] and the chalcopyrite (CuFeS2) [14]. [...]as the Guest Editor of this Special Issue, I would like to extend my appreciation to all the authors for their high-level articles, and I thank all the reviewers for their comments on the manuscripts.

Assessment on Land-Water Resources Carrying Capacity of Countries in Central Asia from the Perspective of Self-Supplied Agricultural Products

Despite the declining hunger in Central Asia, food insecurity remains an important issue due to the dry climate. Taking Kazakhstan, Uzbekistan, Kyrgyzstan, Turkmenistan, and Tajikistan as examples, this study assesses their land-water resources carrying capacity in 1999, 2009, and 2018, on the premise that agricultural water and farmland are spatially matched based on the “buckets effect”, using the ecological footprint and water footprint methods. Results show the following: (1) the total farmland area in Central Asia is sufficient to achieve food self-sufficiency;the available farmland area is 2.45 times that of the farmland required for self-sufficiency in 1999, which decreased to 1.71 times in 2009, but slightly increased to 1.92 times in 2018. Specifically, Kazakhstan maintains a surplus of more than 15 × 106 ha in farmland, while the other 4 countries could not achieve self-sufficiency. (2) The water resources pressure rises;the available agricultural water resource (AAWR) in Central Asia is 3.07 times that of the water demand for agricultural irrigation (WDAI), and 3.06 times that of the water demand for irrigation and environmental purification (WDIEP) in 1999, which decreased to 1.69 times of WDAI and to 1.60 times of WDIEP in 2018. Tajikistan has the highest level of water surplus, followed by Kyrgyzstan and Kazakhstan. Turkmenistan and Uzbekistan do not have enough water to sustain agricultural production. (3) The trend of land-water resources carrying capacity declines in Central Asia. In 1999, 2009, and 2018, the land-water resources could support the population’s food demand in this region when only considering farmland matched with WDAI. However, the population carrying capacity deficit would emerge if we considered the matching farmland with WDIEP.

Discussion on Influencing Factors and Control Range of Disinfection Effect in Waterworks during the COVID-19 Outbreak

This paper studied the influencing factors of disinfection effect in water purification process and the influence of external demand on the water purification process to ensure that the effective virus inactivation rate of waterworks can meet the requirements of microbiological safety during the COVID-19 outbreak. The results showed that the effluent turbidity should be no more than 0. 3 NTU to meet the requirements of coagulation sedimentation filtration process for virus 2-lg removal rate under the condition of the fixed source water temperature and pH value. On the basis of the above,with the monitoring of the effluent turbidity,water level of clean water tank,water quantity of waterworks and residual chlorine by real-time online instruments,the CT value of the clean water tank was controlled and adjusted within an appropriate range in real time,so that it not only met the 4-lg virus inactivation rate but also reduced the risk of disinfection by-products. Finally,a virus reduction rate of above 6-lg was achieved with the treatment process of waterworks,which could meet the biological safety requirements of drinking water during the epidemic,and have a sufficient safety margin.

Addressing Food-Energy-Water Insecurities of the Navajo Nation through University-Community Collaboration

In the US, COVID-19 is rampant within the Navajo Nation the largest tribe in the US, where the rate of poverty (38%) is more than twice that of the state of Arizona (15%). Navajo tribal officials cite the lack of healthy foods and running water as reasons for the prolific virus transmission, resulting in one of the highest COVID-19 infection rates in the US. Partnerships, including those involving research and education, are critical to addressing food, energy, and waste (FEW) insecurities in Native American communities. Over time, integrated, connected, resilient FEW units for remote Dine communities will provide efficient, economically achievable opportunities for dispersed water purification capacity and food-producing greenhouse technology powered by solar energy. Through university-community partnerships involving robust community engagement, technologies can be deployed in remote ocations as well as more urbanized locations.

Detoxifying SARS-CoV-2 antiviral drugs from model and real wastewaters by industrial waste-derived multiphase photocatalysts.

The use of antiviral drugs has surged as a result of the COVID-19 pandemic, resulting in higher concentrations of these pharmaceuticals in wastewater. The degradation efficiency of antiviral drugs in wastewater treatment plants has been reported to be too low due to their hydrophilic nature, and an additional procedure is usually necessary to degrade them completely. Photocatalysis is regarded as one of the most effective processes to degrade antiviral drugs. The present study aims at synthesizing multiphase photocatalysts by a simple calcination of industrial waste from ammonium molybdate production (WU photocatalysts) and its combination with WO3 (WW photocatalysts). The X-ray diffraction (XRD) results confirm that the presence of multiple crystalline phases in the synthesized photocatalysts. UV-Vis diffuse reflectance spectra reveal that the synthesized multiphase photocatalysts absorb visible light up to 620 nm. Effects of calcination temperature of industrial waste (550-950 °C) and WO3 content (0-100%) on photocatalytic activity of multiphase photocatalysts (WU and WW) for efficient removal of SARS-CoV-2 antiviral drugs (lopinavir and ritonavir) in model and real wastewaters are studied. The highest k1 value is observed for the photocatalytic removal of ritonavir from model wastewater using WW4 (35.64 ×10-2 min-1). The multiphase photocatalysts exhibit 95% efficiency in the photocatalytic removal of ritonavir within 15 of visible light irradiation. In contrast, 60 min of visible light irradiation is necessary to achieve 95% efficiency in the photocatalytic removal of lopinavir. The ecotoxicity test using zebrafish (Danio rerio) embryos shows no toxicity for photocatalytically treated ritonavir-containing wastewater, and the contrary trend is observed for photocatalytically treated lopinavir-containing wastewater. The synthesized multiphase photocatalysts can be tested and applied for efficient degradation of other SARS-CoV-2 antiviral drugs in wastewater in the future.

Direct solar vapor generation with micro‐3D printed hydrogel device

Direct solar vapor generation (SVG) provides a sustainable and eco‐friendly solution to the current global water scarcity challenges. However, existing SVG systems operating under natural sunlight suffer from low water yield and high energy requirement of vaporization. New materials with reduced latent heat of water vaporization are in urgent demand to boost SVG process. Herein, we propose a novel strategy to additively fabricate anisotropic hybrid 3D structure from photocurable thermoresponsive p(NIPAm‐co‐PEGDA) hydrogel on the top of PEGDA foam for SVG. The in‐situ post‐printing synthesis of iron oxide nanoparticles within the p(NIPAm‐co‐PEGDA) hydrogel on the top surface, thus introducing anisotropy, is achieved by adding metallic salt precursor into the printing solution. The as‐fabricated hydrogel composite structure exhibits superior light absorption properties and rapid capillary‐driven water transport through a 3D‐printed microchannel network within the hydrogel. As a result, our SVG device achieves an extraordinary water evaporation rate of 5.12 kg m−2 h−1 under one sun (1 kW/m2). The intrinsic water activation states, in addition to wettability modulation with temperature increase within p(NIPAm‐co‐PEGDA) hydrogel, plays a critical role in reducing the equivalent vaporization enthalpy and shifting the vaporization to relatively lower temperatures. The proposed hybrid SVG device is feasible, portable, and highly efficient, promising great potential for grand water‐energy nexus challenges.