Buffer control unit for computer communications

Unit provides character echoing for keyboard display, parity and syndrome generation (error detection), half or full data-packet generation, automatic retransmission of packets, and keyboard lock-up

交通問題に対する応用行動分析学に基づくアプローチ

関西学院大

Tumor formation in hybrids between Solanum lycopersicum and S. habrochaites

Genetic tumors are neoplastic growths that arise spontaneously in particular genotypes in plants. In the present study, we observed the occurrence of tumors in interspecific hybrids between Solanum lycopersicum L. and Solanum habrochaites S. Knapp and D. M. Spooner. The hybridity of these plants was confirmed based on morphological characteristics, flow cytometry and random amplified polymorphic DNA analysis. Hybrids formed tumors when the plants were grown in a growth chamber. These tumors were formed most frequently on leaves, but also on cotyledons, stems and petioles. When hybrid plants bearing tumors were transferred to a greenhouse, the tumors disappeared and necrotic brown spots were visible in the positions where tumors existed previously. Further analyses indicated that tumors were never formed in the greenhouse. These results suggest that environmental conditions influenced tumorigenesis in hybrids raised from S. lycopersicum × S. habrochaites crosses. In addition, when stem segments of hybrids were cultured in vitro on plant growth regulator-free medium, tumors and shoot formation were induced. Thus, hybrids between S. lycopersicum × S. habrochaites provide an excellent experimental system to study plant tumorigenesis and to understand cell division and differentiation.Keywords: Environmental condition, growth abnormality, interspecific cross, tomato, tissue culture, tumorAfrican Journal of Biotechnology Vol. 12(15), pp. 1745-175

Elaborate pupils in skates may help camouflage the eye

Author Posting. © Company of Biologists, 2019. This article is posted here by permission of Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 222 (2019): jeb195966, doi:10.1242/jeb.195966.The skate Leucoraja erinacea is a bottom-dweller that buries into the substrate with its eyes protruding, revealing elaborately shaped pupils. It has been suggested that such pupil shapes may camouflage the eye, yet this has never been tested. Here, we asked whether skate pupils dilate or constrict depending on background spatial frequency. In experiment 1, the skates' pupillary response to three artificial checkerboards of different spatial frequencies was recorded. Results showed that pupils did not change in response to spatial frequency. In experiment 2, in which skates buried into three natural substrates of different spatial frequencies, such that their eyes protruded, pupils showed a subtle but statistically significant response to changes in substrate spatial frequency. Although light intensity is the primary factor determining pupil dilation, our results show that pupils also change depending on the spatial frequency of natural substrates, which suggests that pupils may aid in camouflaging the eye.This work was funded by awards from the Marine Biological Laboratory (specifically, the Hermann Foundation Award, Joan Ruderman Fund Award, Grass Foundation Fund Award and Neal Cornell Career Development Award), as well as a University of Chicago Metcalf Fellowship to C.O.2020-01-2

ショクブツチュウノDihydropteroateゴウセイコウソニカンスルケンキュウ

京都大学0048新制・課程博士農学博士甲第976号農博第107号新制||農||93(附属図書館)学位論文||S45||N357(農学部図書室)2457UT51-45-L244京都大学大学院農学研究科農芸化学専攻(主査)教授 岩井 和夫, 教授 緒方 浩一, 教授 満田 久輝学位規則第5条第1項該当Kyoto UniversityDA