To illustrate, he picked samples of four important varieties: Victoria, long the standard strain, is unacceptably green, he said.
Rather than surveying a sweep of time, the book explored core samples of four years: 1929, 1939, 1948, 1955.
The viruses occurred in samples of four different primate species, sometimes in combination.
Cube samples of four sizes – 40, 100, 150 and 200 mm – were examined.
Samples of four classes of oxide powders (SnO2, Co3O4, TiO2and Al2O3) were infiltrated into a commercial float glass substrate.
Concentrations of technical 4-nonylphenol, 4-n-octylphenol, and 4-tert-octylphenol were investigated in surface water and sediment samples of four reservoirs southwest of São Paulo.
Speech samples of four children and four adult learners of English were selected from two publicly available corpora (CHILDES and ESF).
In 2004, the year of the C.D.C. survey, more than 500,000 children received samples of four medicines that were later the subject of serious safety warnings required by the Food and Drug Administration: Advair, for asthma; Adderall and Strattera, both for attention deficit disorder; and Elidel, for eczema.
To test this hypothesis, samples of four cryoprotectants - methanol (MeOH), dimethyl sulphoxide (Me2SO), propylene glycol (PG) and polyethylene glycol (PEG), some singly, some in combination, were plunged in liquid nitrogen for 5 min to find the best solution for vitrification.
Samples of four different SIBS formulations were fabricated via compression molding, immersed to lipid saturation contents from 5 to 80% by weight, and tested in uniaxial tension, stress relaxation, and dynamic creep modes.
Wine samples of four different countries: Hungary, Czech Republic, Romania and South Africa, have been studied within the European project WINES-DB "establishing of a wine data bank for analytical parameters from third countries".
