Autographa californica nuclear polyhedrosis virus(AcNPV) L-1주의 extracellular nonoccluded virion (NOV)을 보관하는 방법을 연구하였다. AcNPV NOVs을 Spodoptera frugiperda cell line에 감염을 시킨 후에 배양액을 원심분리하여 AcNPV NOVs가 들어 있는 상등액을 취하여 $4^{circ}C$에서 약 11년간 보관하였다. 보관되어 있는 AcNPV NOV을 Spodoptera frugiprda cell line에 재감염하여 관찰한 결과 NOVs의 감염과 증식이 정상적이었으며, NOV의 역가가 $8.9 imes 10^7$pfu/ml에서 $3.8 imes 10^5$pfu/ml로 떨어졌을 뿐이다. 또한 HindIII와 EcoRI 제한효소로 AcNPV genome DNA을 절단하여 패턴을 조사한 결과 DNA제한 효소 패턴은 변하지 않았다. 즉 AcNPV NOVs는 $4^{circ}C$에서 보존하면 10년 이상 안정성이 있고, 취급이 용이하다는 것을 알 수 있었다.
A stable preservation method of extracellular non-occluded virion of Autographa californica nuclear polyhedrosis virus (AcNPV) was studied. AcNPVL-1 strain infected to Spodoptera frugiperda cell line and then the culture media were centrifuged. After centrifugation the supernatant containing extracellular nonoccluded virions of the AcNPV was harvested and incubated at $4^{circ}C$ . Even after the extracellular nonoccluded virions were incubated at $4^{circ}C$ for about 11 years, the infectivity and multiplication property of the nonoccluded virions in the S. frugiperda cell line were normal. However the titers of the nonoccluded virions in TC-100 medium measured about 11 years ago decreased from $8.9 imes 10^7; to ;3.8 imes 10^5$ pfu per ml. The AcNPV genome DNA fragment patterns from digestion with Hind11 and EcoRI restriction endonucleases did not change. The AcNPV nonoccluded virions were stable at $4^{circ}C$ in the cultured medium of more than 10 years and the preservation of AcNPV nonoccluded virions at $4^{circ}C$ is easy and useful for handling.
