Canadian-trained Physicians in United States Internships and Residencies: “Operation Retrieval” and Report of Statistics, 1966-1968

In response to a shortage of medical teachers and scientists, A.C.M.C. began “Operation Retrieval” in 1967 in an effort to contact and to survey graduates of Canadian medical schools who are interns and residents in the United States. This paper describes the publications produced for these graduates, and the concerns of graduates as discovered by on-site visits to Los Angeles, Boston and New York. These concerns centre around difficulties in communication with Canada. This paper also gives a statistical report on the numbers of graduates who are interns and residents in the United States, and the locations, fields of specialization and years of graduation of residents. The decreasing numbers are believed to reflect improving Canadian facilities as well as difficulties associated with the American military draft.     

The occurrence of apiose in Lemna (duckweed) and other angiosperms

1. The branched-chain pentose apiose reacts with the benzidine–trichloroacetic acid reagent on paper chromatograms to give a yellow spot with·an intense white fluorescence in ultraviolet light; on chromatograms developed with butanol–acetic acid–water this spot lies between fucose and rhamnose. 2. Examination of paper chromatograms of hydrolysates of whole plant material has shown the presence of a substance with these properties in a wide variety of species. 3. Among the plants examined two members of the Lemnaceae (Lemna minor and Wolffia arrhiza) were found to be especially rich sources, comparable with Posidonia australis (Bell, Hardwick, Isherwood & Cahn, 1954). 4. Measurements of the apiose content of fractions derived from Lemna have shown that the sugar is present at a concentration of about 4% in the holocellulose, and part of this is retained in the α-cellulose left by extraction with 24% (w/v) potassium hydroxide containing borate.     

Discharge papilla development in the phycomycete Allomyces

The process of discharge papilla (DP) formation in Allomyces macrogynus was studied by light and electron microscopy. The plug of the DP was first deposited between the plasmalemma and the wall of the zoosporangium (ZS). The wall above the plug subsequently was eroded away. Deposition of a new inner wall layer in the sporangium held the plug in place and thickening of the layer formed a collar around the plug. Further deposition of material after this stage resulted in the characteristic pulley-shape. The plug material appeared homogeneous in electron micrographs but there was evidence of an outer layer. Digestion of the plug at the time of spore release was from within.Abbreviations DP discharge papilla - ZS zoosporangium