3,302 research outputs found
The ethical idea of Yag-young CHONG
拙稿は、十八世紀より十九世紀にわたる朝鮮儒者の代表である丁若[?](号は茶山、以下は茶山と略称。一七六二~一八三六)の倫理観を概観しようとするものである。十八世紀の朝鮮は、朱子学の伝統が根底から揺さぶられる ..
First characterisation of the populations and immune-related activities of hemocytes from two edible gastropod species, the disk abalone, Haliotis discus discus and the spiny top shell, Turbo cornutus.
International audienceThe disk abalone Haliotis discus discus and the spiny top shell Turbo cornutus are edible gastropod species of high economic value, mainly in Asia. Mortality outbreaks and variations in worldwide stock abundance have been reported and suggested to be associated, at least in part, with pathogenic infections. Ecology, biology and immunology of both species are currently not well documented. The characterisation of the immune systems of these species is necessary to further assess the responses of H. discus discus and T. cornutus to environmental, chemical and disease stresses. In the present study, we investigated the morphology and immune-related activities of hemocytes in both species using light microscopy and flow cytometry. Two types of hemocytes were identified in the disk abalone hemolymph, blast-like cells and hyalinocytes; whereas four main hemocyte types were distinguished in the spiny top shell, blast-like cells, type I and II hyalinocytes, and granulocytes. Flow cytometric analysis also revealed differences between cell types in immune-related activities. Three subsets of hemocytes, defined by differing lysosomal characteristics, were observed in the hemolymph of the spiny top shell, and only one in the disk abalone. Phagocytic activity was higher in H. discus discus hemocytes than in T. cornutus hemocytes, and the kinetics of PMA-stimulated oxidative activity was different between hemocytes of the disk abalone and the spiny top shell. Finally our results suggest for the first time a predominant mitochondrial origin of oxidative activity in gastropod hemocytes
In vitro embryo rescue for the production of hypotetraploids after cross between hypotetraploid and tetraploid grape cultivars
Consumer demand for seedless grape with high quality and large berry has been increasing. Breeding of hypotetraploid grape was suggested as one of promising methods to satisfy it, but low frequency of hypotetraploid occurrence and low seed germination by abortive embryo were indicated as the major problem to hamper the development of hypotetraploid grape. Hence, this study was carried out to evaluate the basic efficiency of in ovulo embryo culture after the cross between hypotetraploid (‘Hanareum’) and tetraploid (‘Honey Black’ and ‘Kyoho’) grape cultivars on the establishment of hypotetraploid grapes. Embryos and plantlets were hardly obtained in ovules cultured at six after the cross pollination (WAP), but ovules inoculated at 10 WAP produced more embryos as well as plantlets regardless of cross combination. Furthermore, we found that embryo formation was not affected by the basal media in ovules cultured at six WAP, but utilization of specific medium can be more beneficial for embryo formation when ovules were cultured at 10 WAP. A total of 17 plants were obtained from ovules cultured at 10 WAP, and above 50% of plants were identified as hypotetraploid grapes. These results indicate that in vitro embryo rescue after cross pollination between hypotetraploid and tetraploid grape can enhance the efficiency for the breeding of hypotetraploid grapes
Epidemiology and Investigation of Foot‐and‐Mouth Disease (FMD) in the Republic of Korea
This chapter describes about the experience of dealing with FMD outbreaks in the Republic of Korea. We explain what is FMD, the concept of epidemiological investigation on outbreak sites of FMD, including the episode of detecting the index case for seven epidemics occurred since 2000, and information obtained from investigation in Korea. In any case, farmers’ attitude (recognize clinical signs and report suspected cases) played the essential role in determining size and duration of epidemics. A rapid and correct diagnosis including clinical examination and laboratory test for confirmation is also important
The kinematics of young stellar population in the W5 region of the Cassiopeia OB6 association: implication on the formation process of stellar associations
The star-forming region W5 is a major part of the Cassiopeia OB6 association.
Its internal structure and kinematics may provide hints of the star formation
process in this region. Here, we present a kinematic study of young stars in W5
using the Gaia data and our radial velocity data. A total 490 out of 2,000
young stars are confirmed as members. Their spatial distribution shows that W5
is highly substructured. We identify a total of eight groups using the k-means
clustering algorithm. There are three dense groups in the cavities of H II
bubbles, and the other five sparse groups are distributed at the ridge of the
bubbles. The three dense groups have almost the same ages (5 Myr) and show a
pattern of expansion. The scale of their expansion is not large enough to
account for the overall structure of W5. The three northern groups are, in
fact, 3 Myr younger than the dense groups, which indicates the independent star
formation events. Only one group of them shows the signature of feedback-driven
star formation as its members move away from the eastern dense group. The other
two groups might have formed in a spontaneous way. On the other hand, the
properties of two southern groups are not understood as those of a coeval
population. Their origins can be explained by dynamical ejection of stars and
multiple star formation. Our results suggest that the substructures in W5
formed through multiple star-forming events in a giant molecular cloud.Comment: 16 pages, 12 figures, Accepted for publication in A
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