Results 261 to 270 of about 259,966 (297)

A ‘Goldilocks’ hypothesis for dispersal of biological control agents

BioControl, 2011
The rate at which biological control agents disperse from release sites has important implications for their establishment and spread. Low rates of dispersal can yield spread that is too slow and may necessitate redistribution efforts for importation biological control and a high density of release sites for augmentation.
George E Heimpel
exaly   +2 more sources

Biological and Ecological Effects of Dispersants

1989
In the marine environment, commercial dispersants have been employed as part of the clean-up strategy following major oil spills since the late 1960’s and the Torrey Canyon disaster. However, considerable controversy has surrounded the use of these surfactant (“surface active agent”) formulations under such circumstances.
M. W. Trett, S. Shales, B. A. Thake, B. Frankland, D. H. Khan, J. D. Hutchinson, C. F. Mason   +6 more
openaire   +1 more source

Preparation of Boron Nitride Nanotubes Aqueous Dispersions for Biological Applications

Journal of Nanoscience and Nanotechnology, 2008
While in the last years applications of carbon nanotubes in the field of biotechnology have been largely proposed, biomedical applications of boron nitride nanotubes (BNNTs) are yet totally unexplored. BNNTs have very interesting physical properties that should be exploited in the biomedical field.
Ciofani G, RAFFA, VITTORIA, MENCIASSI, ARIANNA, DARIO, PAOLO   +3 more
openaire   +5 more sources

Biological stabilizers for different dispersive clayey soils

2019
Dispersive clays are a particular type of soil materials in which the clay fraction erodes in the presence of water by a process of deflocculating; in the state of de-flocculation, the particles remain in suspension as single units, with a consequent significant problem in geotechnical and geo-environmental projects. Dispersive soils have been found to
Abbaslou, Hakime, Hadifard, Hojat, Ghanizadeh, Alireza, Kharazmi, Sara   +3 more
openaire   +1 more source

Inverse Problems for Dispersive Biological Media

1990
Recently electromagnetic pulses with widths of picoseconds, 10−12 s, and even femtoseconds, 10−15 s, have become available. This opens a new field of inquiry called ultrafast spectroscopy. This new family of tools also provides new ways to look at old problems.
openaire   +1 more source

Effect of Biological and Chemical Dispersants on Oil Spills

Petroleum Science and Technology, 2005
Abstract The aim of this work is to study the effect of different types of chemical and biological dispersants used for crude oil spill treatment. The dispersing efficiency of the different dispersants on the crude oil was determined for selecting the most effective one.
R.I. Abdallah, S.Z. Mohamed, F.M. Ahmed
openaire   +1 more source

Absorption and dispersion of ultrasound in biological tissue

Ultrasound in Medicine & Biology, 1975
Abstract 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 − .
openaire   +1 more source

Rotatory dispersion studies of biologically active metalloporphyrin compounds

Tetrahedron, 1961
THE 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.
openaire   +1 more source

Biological standards for energy dispersive x-ray analysis.

Journal of environmental pathology and toxicology, 1980
Biological 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, A R, Brody, J E, Craighead   +2 more
openaire   +1 more source

Control of the Biological Dispersion of Therapeutic Proteins

1990
Proteins 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 ...
openaire   +1 more source