Results 21 to 30 of about 18,764,038 (293)

Statistical optimization of culture conditions by response surface methodology for synthesis of lipase with Enterobacter aerogenes

open access: yesBrazilian Archives of Biology and Technology, 2009
Optimization of lipase production by Enterobacter aerogenes was carried out using response surface methodology (RSM) where the statistical model was obtained by fractional factorial central composite design.
Annapurna Kumari   +2 more
doaj   +1 more source

A Multivariate Model of Drinking Water Quality Based on Regular Monitoring of Radioactivity and Chemical Composition

open access: yesApplied Sciences, 2023
From a public health perspective, the monitoring of water quality intended for human consumption belongs to the operational and audit management of the supply zones. Our study explores the spatial and temporal patterns of the parameters of drinking water
Cecilia Ionela Tăban   +4 more
doaj   +1 more source

Reactivity parameters in structure-activity relationship-based risk assessment of chemicals. [PDF]

open access: yesEnvironmental Health Perspectives, 1996
New approaches to the risk assessment process are needed that might be more definitive and satisfying to the scientific community, interest groups, and the public at large. This commentary examines an alternative approach that is based on understanding the relationships of chemical structure and reactivity properties to the toxicokinetic behavior of ...
openaire   +2 more sources

Naphthoquinone derivatives exert their antitrypanosomal activity via a multi-target mechanism [PDF]

open access: yes, 2013
Recently, we reported on a new class of naphthoquinone derivatives showing a promising anti-trypanosomatid profile in cell-based experiments. The lead of this series (B6, 2-phenoxy-1,4-naphthoquinone) showed an ED(50) of 80 nM against Trypanosoma brucei ...
Mazet Muriel   +82 more
core   +2 more sources

The influence of magnesium oxide addition on the content of combustion products of aluminum nanopowder in air

open access: yesИзвестия Томского политехнического университета: Инжиниринг георесурсов, 2019
Currently, the development of new methods for nitrides of alkali and alkaline earth elements is an important issue. It is related to the use of nitrides of these elements in different areas of industry.
Alexander Ilyin   +2 more
doaj   +2 more sources

Stability of products of combusting in air aluminum nanopowder with titanium and zirconium dioxides to hydrofluoric acid action in reductive media

open access: yesИзвестия Томского политехнического университета: Инжиниринг георесурсов, 2019
The relevance of the research is related to the need to obtain titanium and zirconium nitrides using less energy-consuming methods, in particular by combustion synthesis of nitrides in the air using aluminum nanopowder as a reductor.
Ekaterina Viktorovna Shinkevich   +1 more
doaj   +2 more sources

Effect of synthesis method parameters on the photocatalytic activity of tungsten oxide nanoplates

open access: yesAIP Advances, 2021
A simple chemical bath deposition method has been developed to study the formation of nanoplate morphology of tungsten oxide. The obtained materials were characterized by field emission scanning electron microscopy, transmission electron microscopy, x ...
Aiymkul Markhabayeva   +4 more
doaj   +1 more source

The influence of calcium oxide addition on the content of combustion products of aluminium nanopowder in air

open access: yesИзвестия Томского политехнического университета: Инжиниринг георесурсов, 2019
Development of new methods for synthesis of nitrides of the alkaline and alkaline-earth elements is currently relevant because these nitrides, and nitrides of other metals are commonly used in industry.
Alexander Ilyin   +2 more
doaj   +2 more sources

Theoretical study on the radical scavenging activity of gallic acid

open access: yesHeliyon, 2023
The global descriptors of the chemical activity: ionization potential IP, electron affinity EA, chemical potential μ, absolute electronegativity χ, molecular hardness η and softness S, electrophilicity index ω, electro-donating ω-, electro-accepting ω ...
Marcin Molski
doaj   +1 more source

Gibbs Free-Energy-Based Objective Function for Electrolyte Activity Coefficient Models

open access: yes, 2017
This paper proposes Gibbs free-energy-based objective functions in the parameter fitting of activity coefficient and specific heat capacity of ions. The activity coefficient parameters are fitted through the averaged squared error between the Gibbs free ...
Jukka Koskinen   +7 more
core   +1 more source

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