Self-feeding activity of a pleuronectiform fish, the barfin flounder     

Toshikazu Sunuma  Masafumi Amano  Takeshi Yamanome  Kiyoshi Furukawa  Kunio Yamamori 《Aquaculture (Amsterdam, Netherlands)》2007,270(1-4):566-569

The self-feeding activity of the barfin flounder (Verasper moseri) was examined under natural photoperiod and temperature. The experiment, carried out over 12 weeks from September to December, involved tagged fish (mean body weight: 371 g) reared in three 1000-l tanks (3 or 5 fish per tank) with a self-feeder device. The sensor comprised a switch and trigger string with a bead. Self-feeding activity was recorded in all tanks from day 1. The fish fed mostly at night. Strong positive correlations were observed between the number of daily feeder activations and water temperature/photoperiod, and all fish grew during the experiment. These results demonstrate that barfin flounder can operate self-feeding systems and it is suggested that self-feeding activity is influenced by photoperiod and water temperature.  相似文献   

Use of ovule culture to cross between Delphinium species of different ploidy     

Kazushige Honda  Hitoshi Watanabe  Kiyoshi Tsutsui 《Euphytica》2003,129(3):275-279

The applicability of ovule culture was examined in reciprocal crosses between the diploid species D. grandiflorum L. and the tetraploid cultivar D. hybridum ‘Galahad’. An interspecific hybrid plant of D. hybridum ‘Galahad’ × D. grandiflorum was obtained,and hybridity was confirmed by chromosome counting. The hybrid was different from the parents in flower color and size but intermediate between the parents in leaf shape. The hybrid showed low pollen fertility and failed to produce viable seeds by either self- or backcross-pollination using fertile pollen grains from its parents. The applicability and efficiency of the ovule culture technique for genetic improvement of the genus Delphinium through interspecific hybridization between different ploidies is discussed. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Production of interspecific hybrids in the genus Delphinium via ovule culture   总被引：3，自引：0，他引：3  

Kazushige Honda  Kiyoshi Tsutsui 《Euphytica》1997,93(3):331-337

The melon (Cucumis melo) plant introduction PI 414723 was observed to segregate for resistance after inoculation with a highly virulent non-aphid-transmissible strain of zucchini yellow mosaic potyvirus (ZYMV-NAT). By self-pollination of selected resistant plants, the percentage of resistant plants increased in successive generations until nearly 100% in the S₇ progeny. A reciprocal cross was made between a resistant S₅ plant of PI 414723 and a plant of the susceptible cultivar Dulce. Parental-, filial-, and backcross- generation plants were inoculated with ZYMV-NAT. One-half of the F₁ plants, regardless of the direction of the cross, were resistant, indicating that the PI 414723 individual used for crossing was heterozygous. The F₂ generation obtained by self-pollination of resistant F₁ plants segregated to resistant and susceptible in accordance with a 27:37 ratio, indicating that, in this cross, three complementary dominant genes are needed for resistance to be expressed. The resistance to ZYMV carried by PI 414723 is oligogenic with the number of genes observed to segregate in crossing depending on the genotype of the susceptible parent. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Comparison of the variability in the levels of pesticide residue observed in Japanese cabbage and grape units     

Fujita M  Yajima T  Iijima K  Sato K 《Journal of agricultural and food chemistry》2012,60(6):1516-1521

To estimate variations in pesticide residue levels in crops, the variability factors (VFs, the 97.5th percentile of the residue levels in the sample divided by the average residue levels in the lot) in residue levels of acetamiprid and cypermethrin applied to cabbage and grapes were investigated, respectively. The VFs in the residue levels of both pesticides in cabbage (2.00 and 2.39, respectively) were clearly higher than those in grapes (1.82 and 1.63, respectively). Although the residue levels of both pesticides in grapes showed a normal distribution, those values in cabbage were slightly skewed at lower residue levels. Individual residue levels in grapes had a good agreement between acetamiprid and cypermethrin. In contrast, the distribution of cypermethrin residue levels in cabbage was slightly skewed at higher residue levels as compared to that of acetamiprid. These results indicate that the difference in the relative distribution of the two pesticides between cabbage and grapes might be due to the influence of various factors such as differences in crop species, plant cultivation methods, and physicochemical properties of the pesticides.  相似文献   

Role of adaptor TRIF in the MyD88-independent toll-like receptor signaling pathway     

Yamamoto M  Sato S  Hemmi H  Hoshino K  Kaisho T  Sanjo H  Takeuchi O  Sugiyama M  Okabe M  Takeda K  Akira S 《Science (New York, N.Y.)》2003,301(5633):640-643

Stimulation of Toll-like receptors (TLRs) triggers activation of a common MyD88-dependent signaling pathway as well as a MyD88-independent pathway that is unique to TLR3 and TLR4 signaling pathways leading to interferon (IFN)-beta production. Here we disrupted the gene encoding a Toll/IL-1 receptor (TIR) domain-containing adaptor, TRIF. TRIF-deficient mice were defective in both TLR3- and TLR4-mediated expression of IFN-beta and activation of IRF-3. Furthermore, inflammatory cytokine production in response to the TLR4 ligand, but not to other TLR ligands, was severely impaired in TRIF-deficient macrophages. Mice deficient in both MyD88 and TRIF showed complete loss of nuclear factor kappa B activation in response to TLR4 stimulation. These findings demonstrate that TRIF is essential for TLR3- and TLR4-mediated signaling pathways facilitating mammalian antiviral host defense.  相似文献   

Chromospheric anemone jets as evidence of ubiquitous reconnection     

Shibata K  Nakamura T  Matsumoto T  Otsuji K  Okamoto TJ  Nishizuka N  Kawate T  Watanabe H  Nagata S  Ueno S  Kitai R  Nozawa S  Tsuneta S  Suematsu Y  Ichimoto K  Shimizu T  Katsukawa Y  Tarbell TD  Berger TE  Lites BW  Shine RA  Title AM 《Science (New York, N.Y.)》2007,318(5856):1591-1594

The heating of the solar chromosphere and corona is a long-standing puzzle in solar physics. Hinode observations show the ubiquitous presence of chromospheric anemone jets outside sunspots in active regions. They are typically 3 to 7 arc seconds = 2000 to 5000 kilometers long and 0.2 to 0.4 arc second = 150 to 300 kilometers wide, and their velocity is 10 to 20 kilometers per second. These small jets have an inverted Y-shape, similar to the shape of x-ray anemone jets in the corona. These features imply that magnetic reconnection similar to that in the corona is occurring at a much smaller spatial scale throughout the chromosphere and suggest that the heating of the solar chromosphere and corona may be related to small-scale ubiquitous reconnection.  相似文献   

Genetic variation in resistance of the tiger pufferfish Takifugu rubripes to a host-specific monogenean parasite Heterobothrium okamotoi     

Kim  Dong In  Hosoya  Sho  Mizuno  Naoki  Ito  Kotaro  Ieda  Risa  Kikuchi  Kiyoshi 《Fisheries Science》2019,85(6):1019-1025

Fisheries Science - The tiger pufferfish Takifugu rubripes is one of the most valuable aquaculture species in Japan. In this study, we investigated the genetic variation in resistance to...  相似文献   

利用内部信息的农用自动引导行走车的研究(第6报)——农用自动引导行走车的实验研究     

于海业  马成林  并河清  村主胜彦 《农业工程学报》1998,14(2):36-39

在已介绍过检测、控制系统基础上,该文主要介绍自动引导行走车的自动引导行走实验。在进行了直线、直角转弯行走实验的基础上,又进行了直线的抗干扰、路径变更、正弦曲线的自动行走实验。取得了良好的实验效果。  相似文献   

Numerical modeling of flood flow after small earthen dam failure: a case study from the 2011 Tohoku earthquake     

Kojima  Hajime  Kohgo  Yuji  Shimada  Kiyoshi  Shoda  Daisuke  Suzuki  Hisato  Saito  Hirotaka 《Paddy and Water Environment》2020,18(2):431-442

Paddy and Water Environment - The 2011 Tohoku earthquake damaged many small earthen dams in Japan, causing flood damage and human casualties. Since then, the necessity for developing accurate...  相似文献