Human lipoproteins comprise at least 12 different classes that are lognormally distributed.

This study presents the results of HPLC, a gentler and rapid separation method in comparison with the conventional ultracentrifugation, for 55 human serum samples. The elution patterns were analysed parametrically, and the attribute of each class was confirmed biochemically. Human samples contained 12 classes of lipoproteins, each of which may consist primarily of proteins.

[Activities of Japanese Occupational Health Service Centers].

Objectives: Although both occupational health centers and occupational health service centers (OHSCs) support small-scale enterprises in Japan, the activities of OHSCs are not well detailed. This survey aimed to clarify the activities and subjective evaluation by directors and coordinators of OHSCs, with a focus on improving occupational health services in small-scale enterprises.

Methods: The survey was conducted by mailing questionnaires to 377 directors and 507 coordinators at 344 OHSCs in Japan from September 2016 to January 2017.