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MR1631259 (2000d:11019) 11B25; 11N13 Gowers, W. T. A new proof of Szemerédi’s theorem for arithmetic progressions of length four. Geometric and Functional Analysis 8 (1998), no. 3, 529–551. This remarkable paper gives a new proof that every subset of the integers with positive density must contain arithmetic progressions of length four. This was conjectured by P. Erdős and P. Turán [J. London M...

Objective: To examine the qualitative and quantitative characteristics of frozen-thawed spermatozoa recovered through the SpermPrep (ZBL, Inc., Lexington, KY) filtration method or the swim-up technique for the purpclse of intrauterine insemination (IUI) or other techniques for assisted reproduction. Design, Setting, Patients: Thirty pairs of frozen specimens purchased from three commercial seme...

To the Editorial Committee of the BRITISH JOURNAL OF OPHTHALMOLOGY. SIRs-Although ophthalmia nodosa has been known for more than a century (Sch6n, 1861), the mechanism of the migration of caterpillar hairs has remained controversial. There is no need to enumerate the explanations proposed, but one point should be noted here which has rarely been mentioned in the recent literature, not even in t...

13 Lederberg, J., Genetics, 32, 505-525 (1947). 14 It should be noted that these data were secured by the plating of undiluted hcultures. When such cultures are diluted and plated the hbacteria form microcolonies which are not visible to the naked eye. Mutations to the h+ condition occur in these microcolonies and in some cases this results in the formation of visible h+ colonies. These plate m...

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Introduction. The language of the TEX/LATEX typesetting system has become all-pervasive in scientific publications and has proven its stability, convenience and expressivity in its three-decade history. With the advent of the Web 2.0 paradigm, it has also become the primary choice of various technical and scientific social platforms, most prominently online encyclopedias (e.g. PlanetMath [Pla])...

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Belin, P. (1926). Bull. Soc. Chim. biol., Paris, 8, 1081. Bernheim, F. (1942). J. Bact. 44, 533. Birkinshaw, J. H. & Raistrick, H. (1931). Philos. Tras. B, 220, 11. Bloor, W. R. (1929). J. biol. Chem. 82, 273. den Dooren de Jongh, L. E. (1926). Ned. Tijdschr. Hyg. 1, 136. Fink, H., Haehn, H. & Hoerburger, W. (1937). Cher. Ztg, 61, 689, 723, 744.. Fiske, C. H. & Subbarow, Y. (1925). J. biol.' Ch...