Showing papers by "Academia Sinica published in 1972"
TL;DR: A set of two complementary dominant weakness genes, W(1) and W(2), was found to control the observed F( 1) weakness in hybrids between strains of Oryza breviligulata and glaberrima endemic to West Africa.
Abstract: Weakness of F(1) plants is frequently found in hybrids between strains of Oryza breviligulata (wild) and O. glaberrima (cultivated rice) endemic to West Africa. A set of two complementary dominant weakness genes, W(1) and W(2), was found to control the observed F(1) weakness. Many breviligulata strains had W(1), while most of the glaberrima and semi-wild strains had W(2) or were free of both. In the weak F(1) plants, tissue differentiation in adventitious roots seemed to be disturbed. Modifier genes affecting the expression of the weakness genes appear to be present also.
51 citations
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TL;DR: The development of pollen grains in cytoplasmic male-sterile rice plants was observed and their anthers are slender and contain globular but small pollen grains which are not deeply stained by iodine.
Abstract: The development of pollen grains in cytoplasmic male-sterile rice plants was observed. Their anthers are slender and contain globular but small pollen grains which are not deeply stained by iodine. Meiosis is normal and pollen tetrads are normally formed, but the microspores do not develop beyond the one-nucleate stage. The tapetum appeared normal.
21 citations
TL;DR: Body length of Aphelenchoides besseyi Christie in second, third and fourth molts reared on Fusarium solani was found to fall into three consecutive but discrete ranges, and the optimum temperature for oviposition and hatching appeared to be 30°, while at 35° the nematode failed to build-up its population, though Oviposition, hatching and molting took place.
Abstract: Body length of Aphelenchoides besseyi Christie in second, third and fourth molts reared on Fusarium solani was found to fall into three consecutive but discrete ranges. The body length of the nematodes in the second molt remained within 225-375 μ under the temperatures tested (16-30°C), while that of the third and fourth molts respectively spread over broader ranges and varied slightly with temperature. When initial inocula consisted exclusively of adults, the percentage of juveniles in a particular age bracket in the population fluctuated with the age of culture. Body length of the second molt was employed to identify the juveniles in an age bracket which should be of second or third developmental stages. Based on the fluctuation curves, generation periods of the nematode reared on F. solani under 16 °, 20 °, 23°, 25 °, 30° and 35° were estimated respectively to be 24 ± 4, 15 ± 2, 9 ± 2, 11 ± 2, 10 ± 2 and 8 ± 2 days. The optimum temperature for oviposition and hatching appeared to be 30°. At 35° the nematode failed to build-up its population, though oviposition, hatching and molting took place.
16 citations
15 citations
TL;DR: The antennal sensory organs of Trichoplusia ni (Hubner) are described and there are 9 types of sensilla: Bohm bristles, chaetica, coeloconica, stylOConica, basiconica, trichodea 1 and 2, auricillica, and campaniformia.
Abstract: The antennal sensory organs of Trichoplusia ni (Hubner) are described. Besides Johnston's organs, there are 9 types of sensilla: Bohm bristles, chaetica, coeloconica, styloconica, basiconica, trichodea 1 and 2, auricillica, and campaniformia.
10 citations
TL;DR: The muscles of tarsus I and their electrical activity are described for Amblyomma maculatum Koch and the activities are related to the sensory receptors within Haller's organ and the brain through the pedal nerve I.
Abstract: The muscles of tarsus I and their electrical activity are described for Amblyomma maculatum Koch. The activities of these muscles are related to the sensory receptors within Haller's organ and the brain through the pedal nerve I.
2 citations
TL;DR: The uniqueness theorem in Luther's paper as mentioned in this paper is stated as a lemma in this paper, and the uniqueness theorem can be used to prove Theorem 2 in our paper as well.
Abstract: In Theorem 1, we shall discuss some properties of semifinite measure, that is, the measure μ on a ring R of sets with the property that, for every E in R , μ( E ) is equal to the least upper bound of μ( F ) where F runs over sets such that F is in R ( F ⊂ E ) and μ( F ) R ) be the σ-ring generated by R . To prove Theorem 2 we shall use the uniqueness theorem in Luther's paper [2], which is stated as a lemma in this paper.
2 citations
TL;DR: In this article, a study of the reaction26Mg(d, p)27Mg in the deuteron energy range from 2.0 to 3.0 MeV was made.
Abstract: A study was made of the reaction26Mg(d, p)27Mg in the deuteron energy range from 2.0 to 3.0 MeV. Angular distributions in the range of (30÷140)° atEd=2.1, 2.3, 2.5, 2.7, 2.8 and 3.0 MeV were measured. Excitation functions ranging from 2.0 to 3.0 MeV were obtained for the reactions leading to the ground and first excited states of27Mg. The direct stripping effect was found to give a considerable contribution to theP0-transition, and its significance appears to increase gradually at bombarding energies from 2.1 to 3.0 MeV. The distorted-wave Born approximation (DWBA) was used to calculate the spectroscopic factor for the ground state. The measured angular distributions of higher proton transitions indicate that compound nucleus formation becomes more important relative to the stripping process.
1 citations