The increasing number of plastics and components used as 1ilastic.izers, stabilizers etc. makes it desirable t o develop minimum requirements for plastics used in blood transfusion equipment. The minimum requirements should be valid both on the national and international level. Such requirements have t o include both chemical arid biological tests on toxicity. It is difficult t o give the precise parameters t o be used in revealing toxicity of such a complex and new material as plastics. Investigations on the toxicity of plastics used in blood transfusion equipment can also be of value when minimum requirements will be set 111) for plastics used in other fields of mrdicine, for example plastics in contact with different parenteral soltitioris, or used in syringes.Chemical tests for plastic materials used in blood transfusion equipments have been published and also prnposeed as national standards [l, 10, 14, 18, 201.Very few biological tests for toxicity in blood transfrisioii equipment are t o be found in Pharmacopoeias. Those published have r i o t even been specially adapted t o plastic equipment. Tests on undue toxicity are the most common. Simple tests for hemolytic substances can also be found [25]. It is generally accepted t h a t red cells in ACDblood stored for 21 days a t 4" to 6" C shall have a 24-hours ~S Ltransfusion survival of a t least 70%. This criterion has been proposed [ 2 3 ] and accepted as minimum requirement, e.g. t o control that the containers [26] or plastic bags [27] for ACD-blood do not interact with the contents.Interesting investigations have been published on the effects of plastics on other blood components, e.g. thrombocytes [2, 7 , 8, 101. but the technical difficulties have made them unsuitable for u s e in s t an (lards.
Summary
During an epidemic in Stockholm in the autumn of 1959 adenovirus type 7 was isolated from 99 hospitalized children. There was serological evidence of acute gdenovirus infection in 75 cases. The virus strains could not be referred to types 7 or 7A according to the scheme of Rowe et al., since no definite differences between the prototypes for these strains could be demonstrated by cross‐neutralization tests. In addition to the symptoms of acute respiratory illness observed previously in such infections, many of the patients exhibited symptoms of gastroenteritis, for which no other cause could be established.
The Mediatron is a modified stereo-tape recorder which is designed to carry out simultaneous recording of audio-commentaries, trigger pulses for photographic slides, and digital signals from a computerized information-retrieval system. Two MEDLARS programs were produced: an orientation program and a self-instructional package. Technical procedures and experiences are briefly discussed.
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