摘要:

Cultural studies demonstrated the fungicidal value of urea and dimethylol urea and the effectiveness of the vapours of certain volatile solids as mould growth inhibitors. A method for preparing sterile artificial eggs for mould studies was developed.Investigations on 21 treatments for preserving eggs at high temperatures indicated that the best results would be obtained by the following procedure: conditioning with carbon dioxide to lower the pH, treating shell surfaces with a disinfectant to reduce contamination followed by effective sealing, preferably with a substance having properties that would prevent both growth and entrance of contaminants during subsequent storage. Dimethylol urea was the most effective growth inhibitor for micro-organisms and vaseline proved to be the best sealing agent. Satisfactory results were obtained by dipping eggs in polyvinyl alcohol treated with dimethylol urea and by packing oil dipped eggs in moisture resistant bags.

ISSN:1923-4287    

DOI:10.1139/cjr42d-007

出版商:NRC Research Press    

年代:1942

数据来源: NRC

摘要:

Thirteen species of medusae, one siphonophoran, two ctenophores, two pteropod molluscs, and two chaetognaths are recorded from coastal waters of the Canadian eastern Arctic, many of them for the first time. All except one are known to be arctic or arctic–boreal species.Hybocodon proliferL. Agassiz has not hitherto been recorded from Arctic water. Specimens answering to this species were found by the author in large numbers at Lake Harbour, on Hudson Strait. The determination of the medusa is possibly not satisfactory, and cannot be considered certain until the hydroid is found. No species ofHybocodonhas been recorded from Greenland water, however, and hence this discovery may be useful to distinguish Canadian polar water from water of the Greenland current.

ISSN:1923-4287    

DOI:10.1139/cjr42d-008

出版商:NRC Research Press    

年代:1942

数据来源: NRC