Immobilization of chloroplasts from grass within a silica matrix synthetized by HIPE method

MRS Advances ◽  
2020 ◽  
Vol 5 (14-15) ◽  
pp. 727-733
Author(s):  
Andrea Vaca-Oviedo ◽  
Jérémy Causse ◽  
Alicia Sommer-Márquez
Keyword(s):  
Fluorescence Spectroscopy ◽  
Photosynthetic Activity ◽  
Environmental Problem ◽  
Negative Impact ◽  
Silica Matrix ◽  
Silica Monolith ◽  
Internal Phase ◽  
Chlorophylls A And B ◽  
Vis Spectroscopy ◽  
Isolated Chloroplasts

ABSTRACTThe deficient disposition of the pruning waste, from grass (Poaceae), has been converted into a considerable environmental problem since it is discarded in common garbage dumps. As a result, gases and lixiviates are generated producing a negative impact on the environment. This project takes advantage of these residues to isolate their chloroplasts, with the aim of subsequently developing bioreactors that absorb CO2. The encapsulation of grass chloroplasts into silica monolith with a hierarchical texture, using high internal phase emulsion (HIPE) method was carried out. The isolated chloroplasts were analysed by UV-Vis spectroscopy to estimate the amount of chlorophylls a and b present in the grass. Moreover, the synthesized samples were characterized by fluorescence spectroscopy for monitoring their photosynthetic activity, having an activity up to at least 90 days.

Macrocellular Titanosilicate Monoliths as Highly Efficient Structured Olefin Epoxidation Catalysts

2019 ◽  
Author(s):  
Valentin Smeets ◽  
Ludivine van den Biggelaar ◽  
Tarek Barakat ◽  
Eric M. Gaigneaux ◽  
Damien Debecker
Keyword(s):  
Sol Gel ◽  
Silica Matrix ◽  
Flow Mode ◽  
Tetrahedral Coordination ◽  
Excellent Performance ◽  
One Pot ◽  
Templating Method ◽  
Porous Texture ◽  
Internal Phase ◽  
Epoxidation Of Cyclohexene

Self-standing macrocellular titanosilicate monolith foams are obtained using a one-pot sol-gel route and show excellent performance in the epoxidation of cyclohexene. Thanks to the High Internal Phase Emulsion (HIPE) templating method, the materials feature a high void fraction, a hierarchically porous texture and good mechanical strength. Highly dispersed Ti species can be incorporated in tetrahedral coordination the silica matrix. These characteristics allow the obtained ‘SiTi(HIPE)’ materials to reach high catalytic turnover in the epoxidation of cyclohexene. The monoliths can advantageously be used to run the reaction in continuous flow mode.<br>

scholarly journals ECO-DESIGN ACTIONS TO IMPROVE LIFE CYCLE ENVIRONMENTAL PERFORMANCE OF FACE MASKS IN THE PANDEMIC ERA

2021 ◽  
Vol 1 ◽  
pp. 1333-1342
Author(s):  
Núria Boix Rodríguez ◽  
Marco Marconi ◽  
Claudio Favi ◽  
Giovanni Formentini
Keyword(s):  
Life Cycle ◽  
Environmental Performance ◽  
Climate Changes ◽  
Environmental Problem ◽  
Negative Impact ◽  
Environmental Issues ◽  
Design Guidelines ◽  
Protective Equipment ◽  
Single Use ◽  
Near Future

AbstractFace masks are currently considered essential devices that people must wear today and in the near future, until the COVID-19 pandemic will be completely defeated through specific medicines and vaccines. Such devices are generally made of thermoplastic polymers, as polypropylene and polyethylene and are single use products. Even if in this period the sanitary emergency must have the maximum priority, the world society should not completely forget the environmental problem that are causing more and more obvious climate changes with correlated damages to ecosystems and human health. Despite the well-known correlation among anti-COVID protective equipment (or more generally medical devices) and environmental issues, the Life Cycle Assessment (LCA) and eco-design-based studies in this field is very scarce. The present study aims to derive the most important environmental criticalities of such products, by using LCA and product circularity indicators of five different common masks. The final aim is to provide eco-design guidelines, useful to design new face masks by preventing negative impact on the environment.

Comparative characterisation of two fulvic acids from East Lake and Liangzi Lake in central China

2015 ◽  
Vol 12 (2) ◽  
pp. 189 ◽  
Author(s):  
Jun Wang ◽  
Huijie Li ◽  
Yong Chen ◽  
Yuan Fang ◽  
Zongping Wang ◽  
...  
Keyword(s):  
Fluorescence Spectroscopy ◽  
Cost Effective ◽  
Fulvic Acids ◽  
Central China ◽  
Anthropogenic Activity ◽  
Cost Effective Method ◽  
Vis Spectroscopy ◽  
East Lake ◽  
Ft Ir ◽  
Eem Fluorescence

Environmental context Fulvic acids account for a large proportion of dissolved organic matter in aquatic environments and affect the transportation and bioavailability of organic and inorganic pollutants. The structural and spectroscopic characteristics of fulvic acids mainly depend on the sources, seasons and anthropogenic activity. We present an advanced approach using fluorescence spectroscopy as a rapid and cost-effective method to investigate the composition, properties and origins of fulvic acids. Abstract Fulvic acids (FAs) isolated seasonally from the sediments of East Lake and Liangzi Lake in central China were comparatively investigated. The structural features of the FAs were characterised using chemical and spectroscopic methods, including elemental analysis, UV-Vis spectroscopy, Fourier-transform infrared (FT-IR) spectroscopy, and three-dimensional excitation emission matrix (EEM) fluorescence spectroscopy coupled with parallel factor analysis (PARAFAC). The O/C, (O+N)/C and C/N ratios of FA extracted from Liangzi Lake (FAL) were higher than those of FA extracted from East Lake (FAE), indicating higher oxygen-containing functionality and polarity and less nutrient in FAL compared with FAE. The two FAs had similar UV-Vis spectra with different absorbance intensities. The FT-IR spectra showed that the two FAs had similar functional groups. The total fluorescence intensity and aromaticity of samples from Liangzi Lake were higher than those of East Lake except for those taken in the summer. The two FAs were largely terrestrially derived organic materials. Five fluorescent components, including four humic-like and two fulvic-like components, were identified by PARAFAC modelling of the EEM spectral data. The fluorescence was dominated by two components. The findings suggest that EEM fluorescence spectroscopy together with PARAFAC is a rapid and cost-effective method for understanding the characteristics and origins of FAs in natural water systems.

scholarly journals Arsenate reductase from Thermus thermophilus conjugated to polyethylene glycol-stabilized gold nanospheres allow trace sensing and speciation of arsenic ions

2016 ◽  
Vol 13 (123) ◽  
pp. 20160629 ◽  
Author(s):  
Jane Politi ◽  
Jolanda Spadavecchia ◽  
Gabriella Fiorentino ◽  
Immacolata Antonucci ◽  
Luca De Stefano
Keyword(s):  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Environmental Problem ◽  
Thermus Thermophilus ◽  
Arsenate Reductase ◽  
Gold Nanospheres ◽  
Enzyme Adsorption ◽  
Ph Values ◽  
Vis Spectroscopy ◽  
The World

Water sources pollution by arsenic ions is a serious environmental problem all around the world. Arsenate reductase enzyme ( TtArsC ) from Thermus thermophilus extremophile bacterium, naturally binds arsenic ions, As(V) and As (III), in aqueous solutions. In this research, TtArsC enzyme adsorption onto hybrid polyethylene glycol-stabilized gold nanoparticles (AuNPs) was studied at different pH values as an innovative nanobiosystem for metal concentration monitoring. Characterizations were performed by UV/Vis and circular dichroism spectroscopies, TEM images and in terms of surface charge changes. The molecular interaction between arsenic ions and the TtArsC -AuNPs nanobiosystem was also monitored at all pH values considered by UV/Vis spectroscopy. Tests performed revealed high sensitivities and limits of detection equal to 10 ± 3 M −12 and 7.7 ± 0.3 M −12 for As(III) and As(V), respectively.

scholarly journals COLLECTION OF POPLAR DOWN AND ITS USE AS A SOLUTION TO THE MOST IMPORTANT ENVIRONMENTAL PROBLEM OF CITIES

2020 ◽  
Author(s):  
Irina Alexandrovna Bryzgalina ◽  
Keyword(s):  
Environmental Problem ◽  
Negative Impact ◽  
Environmentally Friendly

The article is devoted to finding a solution to the most important environmental problem of cities, namely, reducing the negative impact of poplar blooms on the health of people suffering from allergies. It is proposed to collect down and process it into a natural environmentally friendly insulation with unique properties.

scholarly journals Extraction and exploitation of fossil fuels as the foundation stone of concept of geoecology in Russia

2020 ◽  
Vol 13 (4) ◽  
pp. 550-560
Author(s):  
M. S. Goncharov ◽  
I. M. Rozhkov ◽  
I. A. Larionova
Keyword(s):  
Fossil Fuels ◽  
Environmental Problem ◽  
Negative Impact ◽  
Management Information Systems ◽  
Life Quality ◽  
Coal Industry ◽  
Close Attention ◽  
Industrial Enterprises ◽  
Strategic Solution ◽  
Foundation Stone

Energy sector is considered to be the basis for economy’s growth, improvement of the population’s life quality, maintenance of energy security of the country. However, the activities of some enterprises of the fuel and energy complex have a negative impact on the environment. The problems of geoecology in the field of fuel and energy require close attention. In this article, by the example of coal industry, gives an evaluation of effects industrial enterprises on the environment. Based on the analysis of official statistical sources, the key trends in this area are highlighted. The strategic solution to the environmental problem in the coal industry, according to the authors, is the creation of energy technology and coal-chemical clusters. Geoecology management information systems should be developed for each cluster. The simplest structure of these systems is given in this paper. The next stage of the study should be to set and solve the problem of optimizing the functioning of each cluster and calculate rating estimations.

Research on the Interaction between Biomaterials of Human Serum and Dibazol by Fluorescence Spectroscopy

2016 ◽  
Vol 723 ◽  
pp. 656-660
Author(s):  
Tian Hu Wang ◽  
Yin Sheng Luo
Keyword(s):  
Fluorescence Quenching ◽  
Fluorescence Spectroscopy ◽  
Human Serum ◽  
Fluorescence Intensity ◽  
Light Wave ◽  
Light Wavelength ◽  
Peak Wavelength ◽  
Excitation Light ◽  
Vis Spectroscopy ◽  
Distribution In The Organism

The interaction of dibazol to serum was investigated by fluorescence and UV-vis spectroscopy. The fluorescence experiment results show that the fluorescence of human serum can be effectively induced by light wave. The maximum fluorescence intensity of serum is excited at 280 nm and the peak wavelength is about 334 nm. It can also be concluded that the fluorescence intensity gradually increase with the increasing excitation light wavelength. The range of the fluorescence spectroscopy of serum-dibazol system induced by excited at different wavelength is about 290 - 450 nm. The fluorescence intensity of the interaction system of dibazol-serum is significantly reduced, indicating that the fluorescence quenching of serum occurred strongly caused by dibazol and there is a new compound formed between dibazol and serum. The absorption spectra show that there is a large blue in the system of dibazol and serum, which reveal that there is a kind of new complex between dibazol and serum. It is very significance to study the interaction between dibazol and serum for understanding of drug’s toxicity and its distribution in the organism.

Planning and management of activities in the eld of environmental safety at the heating complex

2021 ◽  
pp. 75-79
Author(s):  
Yu.S. Pozdnyak ◽  
◽  
A.E. TIKHOMIROV ◽  
Keyword(s):  
Environmental Impact ◽  
Heat Production ◽  
Environmental Problem ◽  
Negative Impact ◽  
Environmental Safety ◽  
Environmental Risks ◽  
Ecological System ◽  
Environmental Aspects ◽  
Huge Amount ◽  
Harmful Emissions

Heat production activities are accompanied by a huge amount of harmful emissions that enter the environment and cause harm to it, and this is an environmental problem that requires attention. Therefore, the environmental safety of thermal production should be in the first place, since the issue of reducing the negative impact on the ecological system directly affects the sustainable existence of wildlife and humans.The article provides an assessment of environmental risks based on the following factors: the volume of the environmental impact on the environment, the severity of the consequences for the environment, the probability of the environmental impact, the duration of the environmental impact, as well as a scale of assessments of the significance of environmental aspects, the form of the register of environmental aspects and the list of significant environmental aspects.

Investigations on a Galvanic Cell Driven by Photosynthetic Electron Transport

1978 ◽  
Vol 33 (5-6) ◽  
pp. 392-401 ◽  
Author(s):  
Wolfgang Haehnel ◽  
Adelheid Heupel ◽  
Dorothea Hengstermann
Keyword(s):  
Electron Transport ◽  
Open Circuit Potential ◽  
Photosynthetic Activity ◽  
Photosynthetic Electron Transport ◽  
Open Circuit ◽  
Galvanic Cell ◽  
Platinum Electrodes ◽  
High Effectiveness ◽  
Electron Carriers ◽  
Isolated Chloroplasts

Abstract A light-driven galvanic cell was constructed making use of the photosynthetic activity of isolated chloroplasts. Artificial mediators managed the transfer of electrons from the endogenous electron carriers to the platinum electrodes in each of the joined half-cells. In one the mediators were reduced by electrons originating from water. In the other the mediators were oxidized by photosystem I in the presence of an autoxidizable electron acceptor. The redox potential in the single half-cells has been studied as a function of the lipophilicity of the mediators and their concentration. Further­ more different autoxidizable acceptors and different treatments of the chloroplasts were investigated. The combined half-cells were separated by an ultrafiltration membrane. Upon illumination the system gave rise to an open circuit potential of up to 220 mV. This battery was charged with rates as high as photosynthetic electron transport rates. The results are discussed with respect to the arrangement of the cell and the properties of the components for high effectiveness and maximal potential differences.

Photosynthetic activity of isolated chloroplasts from Euglena gracilis

Planta ◽  
1982 ◽  
Vol 154 (1) ◽  
pp. 70-75 ◽  
Author(s):  
Peter Sch�rmann ◽  
Willam Ortiz
Keyword(s):  
Euglena Gracilis ◽  
Photosynthetic Activity ◽  
Isolated Chloroplasts
Sign in / Sign up

Export Citation Format

Share Document