The process of algal growth, as it is influenced by various external and internal conditions, was analysed kinetically, and from the view point of industrialization of algal mass culture, the conditions for obtaining high yield of algal cells were discussed and the problems to be investigated were suggested. This work was aided by the Grants in Aid for Fundamental Scientific Research and for Developmental Scientific Research from the Ministry of Education.
The relational twists of chromonemata in prophase of pollen mitosis originate from the major spirals in meiotic second anaphase. The major spirals elongate longitudinally during the resting stage. Therefore, every gyre of major spirals give rise to two relational twists in prophase of the pollen mitosis. There were observed as many as 17 twists in an arm of chromosome A, which shows only 11 major spirals at meiosis. This is one of the evidences supporting the above conclusion that the relational twists result from the meiotic major spirals. The number of twists decreases to none until metaphase. Modes of unravelling of the twists were classified into 5 types according to the positions where unravelling takes place. The first type comprises chromonemata showing unravelling, which covers evenly throughout the whole arm length. The second, third, forth and fifth represent the types of unravelling which happen in precedence at distal end, kinetochore region, middle portion, and both distal and kinetochore region respectively.
The author has discovered by microchemical tests that the numerous small vesicles in the cells of frond tissues and rhizoids of Dictyopteris divaricata (Okam.) Okam. contain a kind of essential oil consisting of some terpene compounds which have never been reported in seaweeds heretofore. These vesicles are seemingly identical with “Fucosanblasen” named by Kylin or “Physoden” by Crato. After some qualitative tests, the following characters are observed: 1) they are highly refractive (being probably responsible for the iridescence of the frond); 2) they are stained red with Vanillin and conc. HCl; 3) they turn black on treatment with osmic acid; 4) they give no coloration with methylene blue; and 5) they are distinguished from tannin by their solubility in fat solvents such as ether and benzol.