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Results for “Containment of Biohazards”

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29 records · Page 2Linked to original sources
PubMed1979

Sequence analysis of cloned cDNA encoding part of an immunoglobulin heavy chain.

The recombinant plasmid pH21-1 consists of mouse-derived complementary DNA (cDNA) in the E. coli plasmid pMB9. The mouse insertion has been completely sequenced, and encodes the CH3 domain and half the CH2 domain of the immunoglobulin gamma1 heavy chain. The predicted amino acid sequence differs at several positions from that previously published for this protein. The pattern of codon usage resembles that in some other eukaryotic messenger RNAs. A computer program has been used to predict the optimum secondary structure for the mRNA encoding the CH3 domain and the inter-domain junction.

Animals↗
PubMed1976

Biohazard potential: recovery of infectious virus from the liquid nitrogen of a virus repository.

Flame-sealed glass ampules containing vesicular stomatitis (VSV) were submerged in a liquid nitrogen (LN2) refrigerator for storage. Onseveral occasions cracked or shattered ampules were discovered upon removal from the refrigerator. Subsequently, VSV was recovered from the LN2 of the virus repository indicating a source of potential danger to those employing glass ampules submerged in LN2 for preservation of pathogenic organisms.

Laboratories↗
PubMed1976

A study of possible biohazards in the fluorescent antibody test using adenovirus, coxsackievirus, herpesvirus, and respiratory syncytial virus as antigens.

Infectious adenovirus type 5 and coxsackievirus type B5, both nonlipid-containing viruses, were isolated from cells fixed in acetone at 22 degrees C for 15 min, from acetone used for fixation, from the solution used for washing slides during the fluorescent antibody procedure, and after complete processing of antigen preparations with serial twofold dilutions of human antisera and fluorescein-labeled goat anti-human immunoglobulin G. Lipid-containing herpes simplex virus type 1 and respiratory syncytial virus were inactivated by acetone, and infectious virus could not be recovered at any stage in the fluorescent antibody test. Fixation in acetone at 56 degrees C destroyed the infectivity of adenovirus 5 and coxsackievirus B5 within 30 min, but no adverse effect on the antigenic determinants of either virus occurred until after 60 min, thus demonstrating that these antigens can be utilized without the hazard of infectious virus.

Acetone↗
PubMed1978

Wescodyne: lack of activity against poliovirus in the presence of organic matter.

The National Institute of Health Guidelines for Recombinant DNA Research recommends 2% aqueous Wescodyne, an iodophore that is used in many hospitals and laboratories as a disinfectant, as a decontaminant for biological safety cabinets and 5% for a spill outside a cabinet. A contact time of 10 to 15 minutes was given for the 2% solution and 20 minutes was considered adequate for the 5% concentration. The results indicate: 1. Aqueous Wescodyne (5%) is ineffective when used for 80 minutes against poliovirus in a test mixture containing 8.5% bovine serum albumin (a mixture equivalent in protein concentration to the higher range in serum). 2. Wescodyne (10%) employed under the same conditions for 40 minutes is also ineffective. 3. Wescodyne (10% v/v) in 50% ethanol (w/w) was effective and this mixture, originally recommended for hand washing, should be considered for use in biohazard situations, particularly for decontamination of work surfaces and biological safety cabinets. These results are of significance for if a virucide cannot inactivate poliovirus one would be concerned about using the virucide against hepatitis B or SV40 viruses.

Cells, Cultured↗