Results 231 to 240 of about 63,751 (266)
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Absorption and dispersion of ultrasound in biological tissue
Ultrasound in Medicine & Biology, 1975Abstract Absorption of ultrasound is the process of conversion of vibrational energy into heat. In biological soft tissues, the absorption coefficients are roughly proportional to the frequency; typically α = 1 dB cm −1 MHz −1 . The velocities in soft tissues are similar, being about 1,500 msec − .
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Rotatory dispersion studies of biologically active metalloporphyrin compounds
Tetrahedron, 1961THE recent application of rotatory dispersion studies in the elucidation of structures of biologically important molecules has involved consideration of two types of asymmetry; namely, the asymmetry of single carbon atoms, and the asymmetry due to the handedness of coiled macromolecules such as proteins and nucleic acids.
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Biological standards for energy dispersive x-ray analysis.
Journal of environmental pathology and toxicology, 1980Biological standards containing known concentrations of crystalline silica were prepared for x-ray energy spectrometry (XES) using homogenized tissue and gelatin. Sections of 7 micrometer thickness were cut, air dried, carbon coated, and analyzed by XES.
N V, Vallyathan +2 more
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Control of the Biological Dispersion of Therapeutic Proteins
1990Proteins have immense structural variety and variability, ergo their consideration and use of therapeutic agents able to elicit a pharmacological response. As for conventional drugs, much of today’s activity with therapeutic proteins in classical research and development environments ignores the issues of site(s) of action and routes, rates, and ...
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Biological Activity of Chitosan Nanoparticle Dispersions Produced by Fractional Precipitation
Applied Biochemistry and MicrobiologyAn assessment was made of the antifungal and immunomodulatory activity of dispersions of chitosan nanoparticles obtained by fractional precipitation at pH 5.0 and pH 7.5 using chitosan of different molecular weights. The dispersion of nanoparticles obtained at pH 5 has increased fungistatic activity against C. sativus and A.
E. V. Popova +5 more
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Characterization of graphene oxide dispersions in biological media
Graphene oxide (GO), the oxidized form of graphene, is widely studied due to its high dispersibility and ease of production, making it useful in applications like sensors, batteries, solar cells, and as a polymer filler. As GO use increases, so does the potential for human and environmental exposure, necessitating risk assessment beyond its pristine ...Saorin, Asia +4 more
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Early Solar System instability triggered by dispersal of the gaseous disk
Nature, 2022Beibei Liu +2 more
exaly
Unveiling the transition from niche to dispersal assembly in ecology
Nature, 2023Lynette H L Loke
exaly