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排序方式: 共有93条查询结果,搜索用时 15 毫秒
1.
Nakagawa Koki Murase Jun Asakawa Susumu Watanabe Takeshi 《Journal of Soils and Sediments》2020,20(11):4034-4041
Journal of Soils and Sediments - To reveal whether microaerophilic Fe(II)-oxidizing bacteria (FeOB) participate in the Fe(II) oxidation at the oxic-anoxic interface in flooded paddy field soil,... 相似文献
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Khin Moe Kyaw Koki Toyota Masanori Okazaki Takashi Motobayashi Haruo Tanaka 《Biology and Fertility of Soils》2005,42(1):72-82
This paper focuses on N balance in a paddy field planted with whole crop rice (Oryza sativa cv. Kusahonami). The experiment was conducted with two treatments during two rice-growing seasons: one was fertilized with N (160 kg N ha–1; 16N plot) and the other unfertilized (0N plot); both plots were fertilized with P and K. The N input from precipitation was 15 and 12 kg N ha–1 in 2002 and 2003, respectively. The N input from irrigation water reached as much as 123 and 69 kg N ha–1 in 2002 and 2003, respectively. This was because irrigation water contained higher NO3– concentrations ranging from 4 to 8 mg N l–1. The N uptake by rice plants was the major output: 118 and 240 kg N ha–1 in the 0N and 16N plots in 2002 and 103 and 238 kg N ha–1 in 2003, respectively. N losses by leaching were 4.8–5.3 and 6.5–7.3 kg N ha–1 in 2002 and in 2003, respectively. Laboratory experiments were carried out to estimate the amounts of N2 fixation and denitrification. Amount of N2 fixation was 43 and 0 kg N ha–1 in the 0N and 16N plots, respectively. Denitrification potential was quite high in both the plots, and 90% of the N input through irrigation water was lost through denitrification. Collectively, the total N inputs were relatively large due to irrigation water contaminated with NO3–, but N outflow loading, expressed as leaching–(irrigation water + precipitation + fertilizer), showed large negative values, suggesting that the whole crop rice field might serve as a constructed wetland for decreasing N. 相似文献
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Mutants defective in motility or antibiotics production were obtained by Tn5 mutagenesis of a biocontrol agent Pseudomonas fluorescens MelRC2Rif (wt). Tomato or melon seeds were co-inoculated with a Tn5 mutant and wt in a 1:1 ratio and then grown in soil for
10 days. There was no change in ratios of Tn5 mutants defective in antibiosis to wt in the process of rhizoplane colonization,
suggesting little contribution of in vitro antibiosis to the rhizoplane competence of P. fluorescens MelRC2Rif. Similar results were also obtained when seeds treated with bacteria were planted in soil artificially infested
with fungal pathogens. In contrast, ratios of Tn5 mutants defective in motility to wt significantly decreased, suggesting
the contribution of motility to the rhizoplane competence of this bacterium. When a non-motile Tn5 mutant and wt were co-inoculated
into soil at a matric potential of pF 2.3 (–20 kPa) and plants were then grown, there was no change in the ratio in rhizoplane
colonization, suggesting that motility might have a role in the movement along roots but an insignificant role in the movement
from bulk soil towards roots. When they were co-inoculated into 0.2% water agar (WA) instead of soil, a remarkable decline
in ratios was detected. Thus it was soil structure that hindered the efficiency of motility. Time course enumeration of rhizoplane
colonization of tomatoes grown in WA revealed that motility was an important means of movement towards and/or along roots
rather than the multiplication on roots.
Received: 8 July 1996 相似文献
6.
Kuroda K Ashitani T Fujita K Hattori T 《Journal of agricultural and food chemistry》2007,55(8):2770-2778
1,2-Diarylpropane-1,3-diol-type lignin model compounds, 1,2-bis(4-hydroxy-3-methoxyphenyl)propane-1,3-diol (1) and 1-(3,4-diethoxyphenyl)-2-(4-methoxyphenyl)propane-1,3-diol (2), were pyrolyzed at 500 degrees C for 4 s to clarify the thermal behavior of beta-1 subunits in lignin. Products were monitored by gas chromatography/mass spectrometry. The cleavage of the Calpha-Cbeta bond to produce benzaldehydes such as 4-hydroxy-3-methoxybenzaldehyde (9) and phenylethanals as the counterparts such as 4-hydroxy-3-methoxyphenylethanal (10) occurred in pyrolyses of both 1 and 2. In pyrolysis of 1, an oxetane pathway leading to the formation of Z/E-stilbenes without the gamma-CH2OH group such as Z/E-4,4'-dihydroxy-3,3'-dimethoxystilbene (3) was predominant. In pyrolysis of 2, the oxetane pathway was minor, while pathways producing a dimer with a =CgammaH2 group by loss of water and a dimer with an alpha-carbonyl group were predominant. Pyrolysis of Japanese cedar wood provided 3 and 10 in approximately 0.8% and 0.6% yields, respectively, based on the Klason lignin content, while pyrolysis of a guaiacyl bulk dehydrogenation polymer gave them in a very small amount. 相似文献
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Jen JC Chan WM Bosley TM Wan J Carr JR Rüb U Shattuck D Salamon G Kudo LC Ou J Lin DD Salih MA Kansu T Al Dhalaan H Al Zayed Z MacDonald DB Stigsby B Plaitakis A Dretakis EK Gottlob I Pieh C Traboulsi EI Wang Q Wang L Andrews C Yamada K Demer JL Karim S Alger JR Geschwind DH Deller T Sicotte NL Nelson SF Baloh RW Engle EC 《Science (New York, N.Y.)》2004,304(5676):1509-1513
The mechanisms controlling axon guidance are of fundamental importance in understanding brain development. Growing corticospinal and somatosensory axons cross the midline in the medulla to reach their targets and thus form the basis of contralateral motor control and sensory input. The motor and sensory projections appeared uncrossed in patients with horizontal gaze palsy with progressive scoliosis (HGPPS). In patients affected with HGPPS, we identified mutations in the ROBO3 gene, which shares homology with roundabout genes important in axon guidance in developing Drosophila, zebrafish, and mouse. Like its murine homolog Rig1/Robo3, but unlike other Robo proteins, ROBO3 is required for hindbrain axon midline crossing. 相似文献
8.
Microbial populations of the earthworm Eisenia foetida, their casts and farmyard manure (FYM) in which E. foetida had lived were enumerated with the dilution plate method using several media. The microbial community of earthworms appeared
to be similar to that of the FYM in which they had lived, while that of earthworms starved in distilled water for 24 h greatly
differed from that of the FYM. The community of the starved earthworms consisted exclusively (more than 90%) of fast growers,
which were defined as those that formed their colonies within 2 days, unlike that of the FYM (10–30%). About 30 isolates were
randomly chosen and some physiological properties were examined. The community of starved earthworms consisted exclusively
of Gram-negative, oxidase-positive, fermentative bacteria, whereas bacteria from the FYM were much more diverse and there
were no fermentative bacteria in the FYM. The predominant bacteria species of the starved earthworms were identified as Aeromonas hydrophila and considered to be indigenous to the earthworm E. foetida.
Received: 18 June 1999 相似文献
9.
Impact of fumigation with metam sodium upon soil microbial community structure in two Japanese soils
Koki Toyota Karl Ritz Shiro Kuninaga Makoto Kimura 《Soil Science and Plant Nutrition》2013,59(1):207-223
The effects of fumigation with sodium methyl dithiocarbamate (metam sodium) on the microbial community structure and function in 2 soils were investigated using a variety of techniques. In both soils ca. 50% and 90% of the populations of total and culturable bacteria, respectively, were killed by fumigation, with recovery to levels prevailing in control soils 26 d after cessation of fumigation. The size of the ammonium and nitrite oxidiser populations was reduced by up to 4 orders of magnitude by fumigation, with the latter showing a slight recovery 105 d later. There were substantial changes in the C-utilisation (Biolog GN) profiles in the fumigated soils even 105 d later. The number and pattern of amplified 16S ribosomal DNA restriction analysis (ARDRA) fragments was changed by fumigation, and there was a shift in the %G+C profile toward a greater proportion of lower %G+C classes in treated soils. It appeared that DNA released from killed cells remained for some time after fumigation, and masked the apparent community DNA profiles. This study demonstrates that the effects of fumigation on the soil microbial community structure and function were pronounced and for some parameters very persistent. However, the effects on broad-scale properties such as total or culturable bacterial numbers were less enduring. 相似文献
10.
Misako Taniguchi Wilbur Ventura Koki Toyota Makoto Kimura 《Soil Science and Plant Nutrition》2013,59(3):757-766
Epibiotic microorganisms associated with micro crustaceans in the overlying water of Philippine paddy fields were examined by scanning electron microscopy, and their associations were compared with those observed in Japanese paddy fields (Soil Sci. Plant Nutr., 43, 633-641, 651-664, 1997). Various types of microorganisms, including bacteria, protozoa, and algae, colonized microcrustaceans and their kinds and colonizing patterns varied depending on the kinds of microcrustaceans. Common associations between epibionts and respective micro crustaceans were observed in the Philippines and in Japan: e.g., rodshaped bacteria on Cyclopidae and Cypridopsidae; no microorganisms on Simocephalus spp. 相似文献