A flexible surface-coil-type resonator using triaxial cable Rev.This paper presents a method for analyzing the sensitivity of a flexible surface-coil-type resonator (FSCR). It first describes the configuration and the operation principle of the FSCR and then a method for estimating relative sensitivity of the FSCR. In this estimation, the quality factor and the filling factor of the FSCR are formulated because the strength of electron spin resonance (ESR) signals is proportional to the product of these factors. Finally, this paper reports experiments, measuring the ESR spectra of l,l-Diphenyl-2-picrylhydrazyl powder, confirming the validity of the proposed method. 0 1995 American Institute oj" Physics.

SummaryWe analyzed the karyotypes of laboratory strains of Mongolian gerbils showing agouti, black and albino coat colors using conventional and differential staining methods. Of these, three strains have been kept in the author s laboratory over 30 years and one strain was obtained from a supplier. The conventionally stained karyotypes of the gerbils were fundamentally identical to those in previous studies, consisting of 2n=44 (FNa=74) with 42 autosomes: 16 pairs of bi-armed (metacentrics, submetacentrics, and subtelocentrics) and 5 pairs of uni-armed chromosomes (acrocentrics), a large-sized metacentric X chromosome and a small-sized submetacentric Y chromosome. In addition, the G-and C-banded karyotypes were identical to those in previous studies. Notably, our strains carry no intraspecifical karyological variation and their karyotypes are quite stable without a polymorphic state, except for heteromorphic variations caused by size differences as a usual phenomenon. Moreover, the unique C-bands were found in Nos. 5 and 13 chromosomes but fluorescent staining results (using quinacrine mustard and chromomycin A 3 ) at the unique C-band regions differed between Nos. 5 and 13 chromosomes. This fact indicates that such a difference has been caused by higher molecular structures containing proteins rather than nucleotide contents.

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