Results 21 to 30 of about 347,722 (310)

Self-aggregation of soil humic acids with respect to their structural characteristics [PDF]

open access: yesJournal of the Serbian Chemical Society, 2022
The main goal of this work was to estimate the influence of carboxyl and phenolic groups, as well as aromatic, aliphatic and polysaccharide components, on the soil humic acids (HA) self-aggregation process.
Jovanović Uroš D.   +4 more
doaj   +1 more source

On the Relations Between Excess Fraction, Attributable Fraction, and Etiologic Fraction [PDF]

open access: yesAmerican Journal of Epidemiology, 2012
It has been noted that there is ambiguity in the expression "attributable fraction," and epidemiologic literature has drawn a distinction between "excess fraction" and "etiologic fraction." These quantities do not necessarily approximate one another, and the etiologic fraction is not generally estimable without strong biologic assumptions.
Etsuji, Suzuki   +2 more
openaire   +2 more sources

A robust fractionation method for protein subcellular localization studies in Escherichia coli

open access: yesBioTechniques, 2019
Fractionation in Gram-negative bacteria is used to identify the subcellular localization of proteins, in particular the localization of exported recombinant proteins.
Gilles Malherbe   +2 more
doaj   +1 more source

Fractional free space, fractional lenses, and fractional imaging systems [PDF]

open access: yesJournal of the Optical Society of America A, 2003
Continuum extensions of common dual pairs of operators are presented and consolidated, based on the fractional Fourier transform. In particular, the fractional chirp multiplication, fractional chirp convolution, and fractional scaling operators are defined and expressed in terms of their common nonfractional special cases, revealing precisely how they ...
Sümbül, U., Ozaktas, H., M.
openaire   +3 more sources

Identification of biologically active fractions in the dermal secretions of the genus Bombina (Amphibia: Anura: Bombinatoridae)

open access: yesActa Herpetologica, 2020
Amphibian skin secretions have long been considered a convenient and useful natural source of bioactive compounds, but a comprehensive study of the effects of their dermal secretions on diverse parameters of the hemostasis system has not yet been carried
Iryna Udovychenko   +4 more
doaj   +1 more source

A fractional calculus on arbitrary time scales: Fractional differentiation and fractional integration [PDF]

open access: yesSignal Processing, 2015
We introduce a general notion of fractional (noninteger) derivative for functions defined on arbitrary time scales. The basic tools for the time-scale fractional calculus (fractional differentiation and fractional integration) are then developed. As particular cases, one obtains the usual time-scale Hilger derivative when the order of differentiation ...
Nadia Benkhettou   +2 more
openaire   +4 more sources

Fractionation [PDF]

open access: yes, 2019
Fractionation, in the most general sense, could mean any process whereby a mixture is separated into different components or fractions. Examples of fractionation processes include dephlegmation, fractional distillation, fractional freezing, fractional ...

core   +1 more source

Impact of dry, particle-size fractionation on protein and amino acid content of three seaweed species

open access: yesInternational Journal of Food Properties, 2022
Market demand for “clean and green” food products is increasing, and so there is growing opportunity for the seaweed aquaculture industry to take a position as a key food producer in this area.
Laura E Healy   +7 more
doaj   +1 more source

FRACTIONAL DERIVATIVE AS FRACTIONAL POWER OF DERIVATIVE [PDF]

open access: yesInternational Journal of Mathematics, 2007
Definitions of fractional derivatives as fractional powers of derivative operators are suggested. The Taylor series and Fourier series are used to define fractional power of selfadjoint derivative operator. The Fourier integrals and Weyl quantization procedure are applied to derive the definition of fractional derivative operator.
openaire   +2 more sources

FRAKSINASI PROTEIN KAPANG LAUT Xylaria psidii KT30 DAN SITOTOKSISITASNYA TERHADAP SEL HeLa [Fractionation of Proteins of Marine Fungus Xylaria psidii KT30 and their Cytotoxicity against HeLa Cells]

open access: yesJurnal Teknologi dan Industri Pangan, 2014
Cervical cancer is the most common cause of death for Indonesian women after human breast cancer. One of the efforts of cancer treatment is the utilization of natural compounds.
Mita Gebriella Inthe   +2 more
doaj   +1 more source

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