ピーマン種苗の放射線感受性(農学部門)

ピーマンについて, 遺伝的雄性不ねん系統の作出など人為的突然変異誘起の手段としての放射線照射を効果的に行なうためにまずその感受性を調べた。種子照射の場合の生育限界線量はX線で30kr., ガンマー線で50kr.であり, (LD)_はそれぞれ20∿25kr.および40∿50kr.である。苗に対するXさ照射では2kr.が限界線量と考えられ, また1kr.の照射で約15日後にほぼ完全な不ねんをひき起こす。目的とする突然変異の誘起には上記の範囲の線量での照射が効果的であると考えられる。The study of radiosensitivity is important as the first step in plant breeding by radiation. The present study was carried out to investigate the radiosensitivity of dry pepper (Capsicum annuum L.) seeds and young pepper plants exposed to X- or gamma-rays. Philips deep therapy unit was used for X-irradiation and radiocobalt was used as the source of the gamma-ray. The irradiated seeds were sown immediately. Germination of the irradiated seeds was inhibited by high dosage. All of the seedlings, furthermore, were killed by35kr. of X-ray or 60kr. of gamma-ray. (LD)_ in pepper seed is considered to be 20-25kr. of X-ray and 40-50kr. of gamma-ray. For the young plants, 1-2kr. X-irradiation was the most effective, and almost all pollen grains were made abortive by 1kr. irradiation while growth promoting effects were observed at 0.25-0.5kr. irradiation

秋田市下北手地域総合教育計画試案

第1章　総合教育計画の概要第2章　下北手地域の社会構造と教育課題第3章　下北手地域教育課題表付録　総合教育調査集計書（1958.10

VIBRATIONAL CHARACTERISTICS OF SOIL SEDIMENTS IN THE SHANGHAI PLAIN INFERRED FROM MICROSEISMS-ON RELATIONSHIP BETWEEN PEAK FREQUENCIES OF SPECTRAL RATIO, H/V, AND DEPTH TO BEDROCK-

Under the context of IDNDR, a project entitled "Seismic Risk Assessment of Urban Facilities in A Sedimentary Region Affected by River Route Changes" was conducted by DPRI, Kyoto University and State Laboratory for Disaster Reduction in Civil Engineering, Tongji University, China. The subjects include microzonation of the Shanghai region based on microseism observations. Brief reports were given for microseism observations, geological setting of the Shanghai plain, basic characteristics of microseisms at various soil sites and a reference rock site. To evaluate ground vibrational characteristics, spectral ratios of horizontal components to vertical ones, H/V, were examined. All the H/Vs had sharp peaks, which varied with site location. A linear relation between peak periods of H/V and the depth to bedrock was obtained. Applicability of H/V to microzoning of sedimentary regions was discussed.Under the context of IDNDR, a project entitled "Seismic Risk Assessment of Urban Facilities in A Sedimentary Region Affected by River Route Changes" was conducted by DPRI, Kyoto University and State Laboratory for Disaster Reduction in Civil Engineering, Tongji University, China. The subjects include microzonation of the Shanghai region based on microseism observations. Brief reports were given for microseism observations, geological setting of the Shanghai plain, basic characteristics of microseisms at various soil sites and a reference rock site. To evaluate ground vibrational characteristics, spectral ratios of horizontal components to vertical ones, H/V, were examined. All the H/Vs had sharp peaks, which varied with site location. A linear relation between peak periods of H/V and the depth to bedrock was obtained. Applicability of H/V to microzoning of sedimentary regions was discussed