Interference Pattern Analysis Research Articles

Digital holographic interferometry of convective heat transport

Real-time holographic interferometry has been used to study the convective heat transport in a flat plate solar collector. The analysis and interpretation of the interferograms using digital techniques are discussed. This study aims to develop an automated digital process for interference pattern analysis, and thus special attention is given to those optical and physical aspects that are relevant to this goal. This includes the structural systematics of the fringes, noise due to spurious optical effects, and the accuracy of digitized optical signals. Some experimental results on automated analysis of interferograms will be discussed.

Helper-independent mink cell focus-inducing strains of Friend murine type-C virus: potential relationship to the origin of replication-defective spleen focus-forming virus.

Recent studies have indicated that both the replication-defective spleen focus-forming virus (SFFV) in the Friend virus complex and the helper-independent mink cell focus-inducing (MCF) viruses derived from AKR-murine leukemia virus (MuLV) are env gene recombinants between ecotropic virus and xenotropic virus. In an attempt to isolate additional env gene recombinants between Friend murine leukemia virus (F-MuLV) and xenotropic virus, we have inoculated cloned ecotropic F-MuLV into newborn NIH Swiss mice and analyzed MuLV released from preleukemic and leukemic spleens of infected mice. Two helper-independent MCF strains of F-MuLV have been isolated. Like the previously described AKR-MCF viruses, the Friend MCF viruses are env gene recombinants between an ecotropic virus (F-MuLV) and a mouse xenotropic virus, as shown by host range, interference pattern, and tryptic peptide analysis of the gp70s of these MuLV. Furthermore, RNA from the Friend MCF viruses hybridizes completely to cDNAsffv, a nucleic acid probe which detects that portion of SFFV which was not derived from P-MuLV. The ability to isolate replicating MCF viruses derived from F-MuLV FURTHER strengthens the parallels between the Friend erythroleukemia system and the AKR thymic leukemia system. Finally, the potential relationship of helper-independent env gene recombinants between F-MuLV and xenotropic virus to be highly leukemogenic SFFV is discussed.