Search results for "Green"

In-situ synthesis of hydrogen peroxide in tandem with selective oxidation reactions: A mini-review

2014

7 Figuras, 6 Tablas

“Release and catch” catalytic systems

2013

In this perspective article the “release and catch” catalytic system concept is discussed. A “release and catch” catalytic system is prepared by non-covalent immobilization of the catalytic moiety on a suitable support, but differently from the usual non-covalently supported catalyst, the catalytic moiety is released in solution over the course of the reaction and it is recaptured at the end of the reaction. Such a “catalyst- sponge like” or “boomerang” system allows one to combine the benefits of homogeneous and heterogeneous catalysis and can be applied to organometallic-based catalysts, organocatalysts and metal-based catalysts.

2015

One-pot combination of the in-situ generation of hydrogen peroxide (H2O2) with selective oxidation reactions enhances the environmental and economic attractiveness of the use of H2O2 as green oxidant at industrial scale. This tandem reaction improves not only the safety aspects associated to H2O2 storage and transportation but also reduces the capital and operation costs. This review covers the progress in the field focussing on the areas of catalysis development, mechanistic understanding and engineering approaches (such as membrane reactors) for specific systems involving epoxidation of propylene oxide, hydroxylation of benzene, oxygenate synthesis from methane and Fenton processes, highl…

One pot light assisted green synthesis, storage and antimicrobial activity of dextran stabilized silver nanoparticles.

2014

Background Green synthesis of nanomaterials finds the edge over chemical methods due to its environmental compatibility. Herein, we report green synthesis of silver nanoparticles (Ag NPs) mediated with dextran. Dextran was used as a stabilizer and capping agent to synthesize Ag NPs using silver nitrate (AgNO3) under diffused sunlight conditions. Results UV–vis spectra of as synthesized Ag nanoparticles showed characteristic surface plasmon band in the range from ~405-452 nm. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) studies showed spherical Ag NPs in the size regime of ~50-70 nm. Face centered cubic lattice of Ag NPs was confirmed by powder X-ray diffraction (PXRD…

Nitrous oxide emissions in a membrane bioreactor treating saline wastewater contaminated by hydrocarbons

2016

The joint effect of wastewater salinity and hydrocarbons on nitrous oxide emission was investigated. The membrane bioreactor pilot plant was operated with two phases: i. biomass acclimation by increasing salinity from 10 gNaCl L−1 to 20 gNaCl L−1 (Phase I); ii. hydrocarbons dosing at 20 mg L−1 with a constant salt concentration of 20 gNaCl L−1 (Phase II). The Phase I revealed a relationship between nitrous oxide emissions and salinity. During the end of the Phase I, the activity of nitrifiers started to recover, indicating a partial acclimatization. During the Phase II, the hydrocarbon shock induced a temporary inhibition of the biomass with the suppression of nitrous oxide emissions. The r…

REDOX PROPERTIES ARE CONSERVED IN RUBISCOS FROM DIATOMS AND GREEN ALGAE THROUGH A DIFFERENT PATTERN OF CYSTEINES1

2010

Eukaryotic RUBISCO appears in two sequence-diverging forms, known as red-like (present in nongreen algae) and green-like (of green algae and higher plants) types. Oxidation of cysteines from green-like RUBISCOs is known to result in conformational changes that inactivate the enzyme and render a relaxed structure more prone to proteolytic attack. These changes may have regulatory value for green algae and higher plants, promoting RUBISCO catabolism under stress conditions. We compare here red-like RUBISCOs from several diatoms with a representative green-like RUBISCO from Chlamydomonas reinhardtii, paying special attention to the cysteine-dependent redox properties. Purified diatom RUBISCO p…

The Effects of Green Tea (Camellia sinensis), Bamboo Extract (Bambusa vulgaris) and Lactic Acid on Sebum Production in Young Women with Acne Vulgaris…

2022

People struggling with acne vulgaris, not only experience skin eruptions and skin pain, but also report that their quality of life is worse compared with healthy people. This study examined, for the first time, the effect of sonophoresis on select skin parameters (sebum level) in young women suffering from acne vulgaris. The study included 60 women 19–23 years of age (M = 21.45, SD = 0.91) with mild and moderate facial acne. The inclusion criteria were 19–23 years of age, female or male gender, mild to moderate acne, no dermatological treatment within last 12 months, and no hormonal contraception (women). No men volunteered for the study, so the group was homogeneous. The patients were divi…

ACHIEVING EMPLOYEE SATISFACTION BY PURSUING SUSTAINABLE PRACTICES

2013

Internal marketing is based on the satisfaction of employees that eventually leads to the retention and attraction of the best employees that help a company succeed in a highly competitive globalized environment. In the context of internal marketing, sustainability would translate into a triple advantage of employee satisfaction, long-term sustainable profit and a durable planet with less pollution. For a more complete vision of the practice of internal marketing in ten global companies, we researched the satisfaction of employees from two perspectives: current satisfaction at work and motivation to work for the current company over the next three years, as evidence of the present satisfact…

Segmentation of Employee Perceptions in Relation to Corporate Social Responsibility Practices

2013

Sustainability is changing the competitive landscape and reshaping the opportunities and threats that companies face. However, for companies to become green they need employees to develop, believe and engage with these initiatives. To achieve success with sustainable practices, companies can use internal marketing which is based on the satisfaction of employees as a premise to achieve the retention and attraction of top talent that will lead to corporate success. It is estimated that the internal customer satisfaction and loyalty contribute to satisfying the external customers, leading ultimately to a company's profit maximization. In this paper I explore the impact of companies' sustainabi…

IEL. 22-23- Unit 9. The EU environmental policy (II)

2023

El document forma part dels materials docents presentants al Servei de Política Lingüística de la Universitat de València, convocatòria Premis Fernando Sapiña 2022 a la qüalitat lingüística en l’elaboració de materials docents en valencià i en anglès. The EU Green Deal- Supplying clean, affordable and secure energy - Mobilising industry for a clean and circular economy - Accelerating the shift to a sustainable and smart mobility.