@article{oai:ir.kagoshima-u.ac.jp:00007887,
 author = {柏田, 研一 and 金澤, 昭夫 and 橘園, 重夫},
 issue = {2},
 journal = {鹿児島大学水産学部紀要=Memoirs of Faculty of Fisheries Kagoshima University},
 month = {2016-10-28},
 note = {The present paper reports a continuation of our study which deals with organic compounds in natural water. In this study we determined five vitamins in the water of the Lake Kasumigaura, during the year 1962-63. All of the vitamins were determined by microbioassay method using lactic acid bacteria as the test organism. The results were shown in Table 1 and Fig. 1. 1. The nicotinic acid was contained in the lake water, with a high summer level (about 3γ/l) and low winter level (about 0.3γ/l). (Fig.1-a). 2. Similar seasonal changes of pantothenic acid and biotin content were found with a high summer level and low winter level. (Fig. 1-b and c) 3. The folic acid content increased rapidly from July to September and reached a maximum in October, and then decreased rapidly. (Fig.1-d). 4. The content of vitamin B_{12} ranged from 5 to 28mγ/l. There was no evidence of a special seasonal change of vitamin B_{12} content. (Fig.1-e)},
 pages = {153--157},
 title = {天然水中の有機物に関する研究II : 霞ヶ浦におけるニコチン酸, パントテン酸, ビオチン, 葉酸及びビタミンB_12含有量の季節的変化},
 volume = {12},
 year = {}
}