A riddle is a large sieve used to separate soil or compost particles, or for separating soil from vegetables. Beverly LJ, Howell LA, Hernandez-Corbacho M, Casson L, Chipuk JE, Siskind LJ (2013) BAK activation is necessary and sufficient to drive ceramide synthase-dependent ceramide accumulation following inhibition of BCL2-like proteins. Biochem J 452(1):111–119

You may need to factor in many different criteria to select the proper test sieves for your application. Our What Is A Sieve? blog post and this video will help you understand test sieves and the choices available to you. U.S. and Metric Sieve Sizes: Not That Different A manufactured test sieve that has had a specified number of openings measured. There is a confidence level of 99% that the standard deviation of the openings is within the requirements of ASTM E11 or ISO 3310-1. Also, see Compliance Test Sieve and Calibration Test Sieve All aggregates are developed from natural aggregates only. But the manufactured aggregates are nothing but forms of natural aggregates which is given new sizes and shape which can be used for various construction activities. Properties of Coarse Aggregates Kim HJ, Mun JY, Chun YJ, Choi KH, Kim MY (2001) Bax-dependent apoptosis induced by ceramide in HL-60 cells. FEBS Lett 505:264–268 A graph that defines the gradation of material, showing particle sizes plotted against the percent retained or percent passing a series of test sieves. Also, see Particle Size Distribution Graph

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Sieve covers are lids that nest into the top of a sieve to prevent sample loss, contamination, or changes in moisture during agitation or handling. The test sample after being dried and weighed shall be placed in the container and sufficient water added to cover it. The contents of the container shall be shaken vigorously.

Rodriguez-Lafrasse C, Alphonse G, Broquet P, Aloy MT, Louisot P, Rousson R (2001) Temporal relationships between ceramide production, caspase activation and mitochondrial dysfunction in cell lines with varying sensitivity to anti-Fas-induced apoptosis. Biochem J 357(Pt 2):407–416 Grains and Legumes: The sieve can help wash rice, quinoa, lentils, and other grains, removing small debris and excess starch. Sieve opening sizes were initially defined in ASTM standards using imperial (inch) units of measure for apertures 1/4in (6.3mm) or above. Mesh number sizes for finer sieve cloth were determined by counting the number of apertures per linear inch. So, a No. 4 Sieve would have four openings in every linear inch. ISO openings are described in millimeters (mm) or micrometers (µm). Sieve pans and covers collect fine material passing the sieves and prevent sample loss during handling and testing.Siskind LJ, Colombini M (2000) The lipids C2- and C16-ceramide form large stable channels: implications for apoptosis. J Biol Chem 275:38640–38644 Andrews NW, Almeida PE, Corrotte M (2014) Damage control: cellular mechanisms of plasma membrane repair. Trends Cell Biol 24:734–742