Mouse embryonic stem (ES) cells with the C57BL/6 genetic background allow the generation of knockout mice without the need to backcross to C57BL/6. However, C57BL/6 ES cells whose pluripotency after homologous recombination has been confirmed are not yet available from public cell banks. To facilitate the use of ES cells derived from C57BL/6 sublines in both biologic and medical research, we de...

Whereas increasing concerns about radiation exposure to nuclear disasters or side effects of anticancer radiotherapy, relatively little research for radiation damages or remedy has been done. The purpose of this study was to establish level of LD70/30 (a lethal dose for 70% of mice within 30 days) by total-body γ irradiation (TBI) in a mouse model. For this purpose, at first, 8-week-old male IC...

Long-chain polyunsaturated fatty acids (PUFAs) are essential nutrients for all marine animals that have previously been studied. Most marine animals obtain long-chain PUFAs from their diets (i.e. as products of photosynthetic processes) and few are known to be able to produce these compounds de novo. Deep-sea vent organisms live in an environment that is relatively isolated from photosynthetic ...

In the present study, we used a dry maze task to assess the spatial learning ability of C57BL/6N and BALB/cA mice besides the water maze task. In Experiment 1, the performance of C57BL/6N and BALB/cA mice in the water maze task and dry maze task were investigated. In the former task, the mice had to learn the position of a hidden platform submerged below the water surface and they had to learn ...

Increasing attention has been focused recently upon those factors in carcinogenesis that are responsible for the proliferation of initiated cells and the increasingly aberrant phenotype that they progressively manifest. The agouti locus alÃ-ele/(" (viable yellow) has been shown to be associated with conditions which favor promotion of cells that have been initiated by a wide variety of causes, ...

Using the second conjecture in the paper [10] of the author and inspired by the theory of modular functions we find a method which allows us to obtain explicit formulae, involving η or θ functions, for the parameters of a class of series for 1/π. As in [10], the series considered in this paper include Ramanujan’s series as well as those associated with the Domb numbers and Apéry numbers. 1 A sp...

In the murine model of Lyme disease, C3H/He mice exhibit severe arthritis while C57BL/6N mice exhibit mild lesions when infected with Borrelia burgdorferi. Joint tissues from these two strains of mice harbor similar concentrations of B. burgdorferi, suggesting that the difference in disease severity reflects differences in the magnitude of the inflammatory response to B. burgdorferi lipoprotein...

Inbred mice are an essential animal strain for research as they can improve the reproducibility and reliability of study results. The establishment of new inbred lines is continuing, and new inbred lines are being used in many research fields. C57BL/6 is a mouse laboratory animal that has been developed and used as an inbred strain since early stage of mouse strain development, and, in the 1950...