[en] By developing and spreading the Ps41 variety, having a high resistence to mosaic disease which is a number one disease in Indonesia's sugarcane culture, the problem of the disease has more or less been solved. Mutation breeding by means of gamma irradiation was carried out in 1973. Irradiation amounting to 5000R/1 is a stable one. Artificial pokkahbung and top borer (Scirpphopaga nivella intacta Sn) infection was treated to see the tolerance of Ps41/5U00R/1 against these disease. It can be concluded that this variety has a higher tolerance and a more significant difference than the control. Trials of this mutant against the original Ps41 on large plot (furrows) with 3 replications will be conducted at Kebonagung sugar estate in planting year 1975/1976. At this estate (400m above sea level) with a wet climate, the pokkahbung infestation is very pronounced together with a high top borer infestation. The production level can also be determined. (author)

[en] Experiments have been done in the preparation of radioiodinated fats and fatty acids by using triolein and oleic acid. The radioiodination (¹³¹I) had been carried out by the iodomonochloride method and the radiochemical purity was determined by paper chromatography. It has been found that the final products are stable after a fiew days under ordinary storage condition. (author)

[en] It has been known that protoporphyrin(PP) could be accumulated in tumor tissue and its complex with cobalt inhibits the growth of undifferentiated cells. Preparation of ⁵⁸Co-PP has been carried out using Co-58 labelled CoCl₂ in glacial acetic acid and PP in CHCl₃-pyridine mixture. It has been studied the influence of CoCl₂ as carrier and time of heating against the labelling efficiency and chemical yield. Chemical and radiochemical analysis using thin layer chroamtography(TLC) and high performance liquid chromatography(HPLC) show-ed that the complex was pure enough with 98.50% radiochemical purity. This complex has absorption bands in the vissible region at 531.8nm and 565.0nm and in Soret region at 415.6nm in methanol. (author)

[en] Heavy damage to cabbage plantations in Indonesia as caused by plutella maculipennis and crocidolomia binotalis furnished economic justification of research on the sterile-male approach to eradication of this species. The sterile-male technique requires a mass-production of these insects, therefore studies were initiated on rearing larvae in artificial diets. A series of media based on biochemical and biological ingridients were tested. Larvae of the second instar were kept on artificial medium up to 14 days reaching the fourth instar (prepupae). The observation was carried out on the rates pupation, adult emergence and eggs production, continuoous to their progenies. No morphological damaged are found on the diet-reared insects. A complete absence of cholesterol in the diet for crocidolomia binotalis brought on the emergence of non-fecund adults. (author)

[en] A part of the Baturaja formation was discovered at the wai Seputih and the wai Sekampung. They are consisting of quartz sandstones, quartz conglomerates, siltstones, shales, and stringers of coals and limestones. The limestones contain spiroclypeous and myogypsina. The Baturaja sediment in this area is about 130 metres until 600 metres thick, they were improperly deposited in old miocene on the crystalline schist and massive granite and were overlain by the pleistocene volcanic sediment. (author)

[en] Research on the induction of mutation by means of gamma-rays irradiation has been conducted by the author since 1968. Despite some defective mutants obtained, a positive mutant was observed on the M₂ of irradiated seed of the variety H790. The seed was irradiated in the cobalt unit at the rate of 3000 r after being soaked in water for 60 hours. Preliminary observation on the M₇ revealed the greater number of leaves, higher plant, and earlier maturity of the mutant as compared with its control. Further observations concerning the productivity and the quality of the cured leaves still have to be carried out. (author)

[en] Low dose gamma irradiation is used for investigating its effects on the rice seedlings of gamma 87 and PB5 varieties, which are damaged by bad storage. The results are presented in parabole graphic. (SMN)

[en] The experiment has been performed on guinea pigs which were irradiated by gamma rays with doses of 0, 150, 300 and 600 rad. Observations were carried out on peripheral blood in regard to red blood cell, white blood cell and haemoglobine, every week after irradiation. +he result obtained showed that 150 rad was the optimal stimulation effective dose for antibody production in guinea pigs. (author)

[en] Basic concept of partial coherence of light using the measuring method of coherence degree and control of coherence degree are presented. (author tr.)

[en] Neutron diffraction experiment on KCoF₃ was performed at room and liquid nitrogen temperatures with thermal neutron wavelength 1.07 A. The peaks of magnetic superlattice at low temperature diffraction pattern were indexed on a cubic magnetic unit cell with twice the edge on the corresponding perovskite unit cell, and the magnetic structure seems to be in the G-type structure. (author)