Results 251 to 260 of about 7,072,566 (293)

Refractive Index of Concentrated Protein Solutions

Nature, 1954
AN accurate knowledge of the specific refraction increment α, or dn/dC, of proteins is important in measurements which involve the use of the ultra-centrifuge, electrophoresis and light-scattering. Recently, it has become important in connexion with cytological methods of refractometry1 and mass determination2 of living cells.
R, BARER, S, TKACZYK
openaire   +2 more sources

Open Concentration Index

Proceedings of the 12th International Symposium on Open Collaboration, 2016
The market concentration is a measure of competition and, as such, is closely monitored by public competition authorities in the European Union or the United States. Among recent claims in Europe, we study the case of the mobile operating system Google Android, despite its open source quality and the fact it can as such be regarded as presenting no ...
openaire   +2 more sources

Correcting the Concentration Index: A reply to Wagstaff

Journal of Health Economics, 2009
Abstract In this note, I reply to Adam Wagstaff's criticism of my corrected version of the Concentration Index for bounded health variables. I focus on three issues: (1) Wagstaff's suggestions with regard to the scale invariance property; (2) his distinction of relative and absolute inequality; and (3) a comparison of Wagstaff's index W with my index
openaire   +2 more sources

A note on zenga concentration index

Journal of the Italian Statistical Society, 1995
The Zenga index, , is shown to be a concentration index, in the sense that, ifX andY are non negative random variables with ...
Berti P., RIGO, PIETRO
openaire   +1 more source

A comparison between the g‐index and the h‐index based on concentration

Journal of the Association for Information Science and Technology, 2015
I discuss how, given a certain number of articles and citations of these articles, the h‐index and the g‐index are affected by the level of concentration of the citations. This offers the opportunity for a comparison between these 2 indices from a new perspective.
openaire   +3 more sources

The Apparent Free Testosterone Concentration, An Index of Androgenicity

The Journal of Clinical Endocrinology & Metabolism, 1971
ABSTRACT As free non-protein bound testosterone is generally considered to represent the active androgen fraction in plasma, we developed a method, based on equilibrium dialysis of diluted plasma, by which the “apparent free testosterone concentration” (AFTC) in undiluted plasma is obtained. This AFTC was determined in normal adult, (pre)adolescent and
A, Vermeulen, T, Stoïca, L, Verdonck
openaire   +2 more sources

Size and mercury concentration relationship as contamination index

Bulletin of Environmental Contamination and Toxicology, 1987
The possible relationship which exists between size (as weight or length) and mercury concentration in muscle is used by some authors as evidence of the degree of mercury contamination present in aquatic environments. In this study, the level of mercury contamination present in populations of red crayfish (Procambarus clarkii) and grey mullet (Liza ...
F, Rincón, G, Zurera, R, Pozo-Lora
openaire   +2 more sources

Graded-index planar waveguide solar concentrator

Optics Letters, 2014
Planar waveguides are useful to transport, concentrate and distribute light uniformly over large dimensions. Their capacity to collect and gather light efficiently over a large distance is interesting for many applications, like backlighting and solar concentration.
Sébastien, Bouchard, Simon, Thibault
openaire   +2 more sources

The Lerner index and measures of concentration

Economics Letters, 1979
Abstract The paper investigates the relationship between price-cost margins (the Lerner index) and measures of seller concentration. It shows that previous disparate conclusions on the appropriate concentration measure are special cases that can be reconciled in a more general formulation.
openaire   +1 more source

Determination of prothrombin concentration as an index of anticoagulant control

The American Journal of Cardiology, 1961
N SPITE OF the intensive efforts of many hematologists, the precise sequence of events producing coagulation of blood remains obscure. The application of results of in vitro studies to an understanding of coagulation in vivo has proved a troublesome and perilous transition to the clinician in his attempt to devise effective means for the prevention of ...
J C, OWENS, C A, ARMBRUST, W C, SUTTON, W R, LIVESAY, E L, WAGNER   +4 more
openaire   +2 more sources