排序方式: 共有39条查询结果,搜索用时 15 毫秒
21.
Widyanto Dwi Nugroho Sri Nugroho Marsoem Koh Yasue Takeshi Fujiwara Toshiko Nakajima Masanori Hayakawa Satoshi Nakaba Yusuke Yamagishi Hyun-O Jin Takafumi Kubo Ryo Funada 《Journal of Wood Science》2012,58(3):185-194
The anatomical characteristics and density of wood were examined in 23-year-old Acacia mangium trees that had been planted in Yogyakarta, Indonesia. The seeds had been collected from trees of five different provenances. The distance from the pith of the boundary between juvenile and mature wood was also examined to clarify the maturity of the wood. Lengths of wood fibers near the pith and the distance from the pith of the boundary between juvenile and mature wood differed significantly among provenances. By contrast, other anatomical characteristics of the wood such as fiber wall area, fiber wall thickness, fiber diameter, vessel lumen area, vessel diameter, vessel frequency and wood density did not differ significantly among provenances. Wood density was strongly correlated with the area of fiber walls. Our observations suggest that Sidei and Daintree might be more appropriate provenances among those examined for the Acacia mangium tree-breeding programs in Indonesia that are aimed at improving wood quality, because these provenances are associated with longer initial wood fibers and narrower juvenile areas than the other provenances studied. 相似文献
22.
Nobuo Ohno Keimei Fujimoto Yoshitoshi Okuno Toshio Mizutani Masachika Hirano Nobushige Itaya Toshiko Honda Hirosuke Yoshioka 《Pest management science》1976,7(3):241-246
Although structure modifications of natural pyrethrin constituents have disclosed a variety of potent synthetic analogues, all known examples are cyclopropanecarboxylate esters, a grouping that appeared to be essential for insecticidal activity. Some new substituted 2-phenylalkanoates, whose biological activities are of a similar nature and potency to those of conventional pyrethroids, are now reported. 5-Benzyl-3-furylmethyl and 3-phenoxybenzyl 3-methyl-2-phenylbutyrates and their analogues are potent insecticides. Activity is increased on the introduction of appropriate groups into the 3 and/or 4-positions of the aryl ring and the (S)-2-phenylalkanoates are far more active than their (R)-enantiomorphs. Structure/activity relationships are compared with those for conventional pyrethroids. Some of the new series compare favourably with typical insecticides in tests against Musca domestica, Spodoptera litura and Plutella xylostella. 相似文献
23.
Gummy stem blight of balsam pear found in the Kanto district and in the Hokkaido Prefecture was demonstrated to be caused
by Didymella bryoniae (Auerswald) Rehm based on inoculation experiments, molecular analysis, and morphological identification of the pathogenic
fungus. This fungus was also pathogenic to related plants belonging to Cucurbitaceae. The imperfect stage of the fungus was
identified as Phoma cucurbitacearum (Fr.: Fr.) Sacc. based on morphological similarities. 相似文献
24.
Chemical constituents of Morinda citrifolia fruits inhibit copper-induced low-density lipoprotein oxidation 总被引:6,自引:0,他引:6
Kamiya K Tanaka Y Endang H Umar M Satake T 《Journal of agricultural and food chemistry》2004,52(19):5843-5848
The oxidative modification of low-density lipoprotein (LDL) plays an important role in the genesis of arteriosclerosis. The present study focused on the effects of the fruits of Morinda citrifolia on preventing arteriosclerosis. The MeOH extract and CHCl(3)-, EtOAc-, n-BuOH-, and H(2)O-soluble phases derived from the fruits of M. citrifolia were evaluated for their inhibitory activity on copper-induced LDL oxidation by the thiobarbituric acid-reactive substances (TBARS) method. The MeOH extract and EtOAc-soluble phase showed 88 and 96% inhibition, respectively. Six lignans were isolated by repeated column chromatography from the EtOAc-soluble phase. These compounds were determined by spectroscopic analysis to be 3,3'-bisdemethylpinoresinol (1), americanol A (2), americanin A (3), americanoic acid A (4), morindolin (5), and isoprincepin (6), of which 4 and 5 are novel compounds. These compounds inhibited copper-induced LDL oxidation in a dose-dependent manner. 1, 2, 5, and 6 exhibited remarkably strong activities, which were the same or better than that of the known antioxidant 2,6-di-tert-butyl-p-cresol. The IC(50) values for 1, 2, 5, and 6 were 1.057, 2.447, 2.020, and 1.362 microM, respectively. The activity of these compounds is mainly due to their number of phenolic hydroxyl groups. 相似文献
25.
26.
Oishi N Maeda M Makimura K Sawaguchi T Hayashiya M Kubo T Kano R Hasegawa A Kasahara M 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2005,67(10):1055-1057
The genetic variability of 182 unrelated mongrel dogs living in various areas of Japan (from Hokkaido to Okinawa) was studied by collecting their blood. Ten microsatellite loci were chosen from different autosomal chromosomes. After combining a few rare adjoining alleles to allelic classes, it was confirmed that the Hardy-Weinberg equilibrium was attained in each locus. The polymorphic information contents (PICs) of the loci, Ren37A11, Ren48E01, AHTk253, ZuBeCa30, Ren277K09, Ren42N13, AHT130, PEZ03, PEZ12, and AHT121, were 0.58, 0.63, 0.67, 0.67, 0.68, 0.71, 0.79, 0.80, 0.80, and 0.80, and the power of discriminations (PDs) were 0.80, 0.85, 0.87, 0.88, 0.88, 0.89, 0.94, 0.94, 0.94, and 0.94, respectively. The combined mean exclusion chance (MEC) was 0.9995, indicating that these microsatellite loci are useful for kinship testing of Japanese dogs. 相似文献
27.
Soichiro Morita Mikiko Azuma Toshiko Aoba Hiroya Satou Kazuhiko Narisawa Teruyoshi Hashiba 《Journal of General Plant Pathology》2003,69(1):71-75
The root endophytic fungus Heteroconium chaetospira isolate OGR-3 was tested for its ability to induce systemic resistance in Chinese cabbage against bacterial leaf spot caused
by Pseudomonas syringae pv. maculicola and Alternaria leaf spot caused by Alternaria brassicae of the foliar diseases. Chinese cabbage seedlings planted in soil infested with an isolate of H. chaetospira were incubated in a growth chamber for 32 days. The first to fourth true leaves of the seedlings were challenge-inoculated
with P. syringae pv. maculicola or A. brassicae. Chinese cabbage planted in soil infested with H. chaetospira showed significant decreases in the number of lesions of bacterial leaf spot or Alternaria leaf spot when compared to the
control plants not treated with H. chaetospira. The results indicated that colonization of roots by H. chaetospira could induce systemic resistance in Chinese cabbage and reduce the incidence of bacterial leaf spot and Alternaria leaf spot.
Received: April 24, 2002 / Accepted: August 9, 2002 相似文献
28.
Ayano HIRAKO Jin SUN Satoshi FURUKAWA Takashi TAKEUCHI Akihiko SUGIYAMA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(12):1565-1571
Two-day-old rats were treated with subcutaneous injections of methotrexate (MTX) 5 mg/kg
and 150 mg/kg, and their rostral migratory streams (RMS) were examined time-dependently.
MTX treatment increased pyknotic and TUNEL-positive cells and decreased mitotic and
phospho-Histone H3-positive cells at almost all time points in the vertical arm, elbow and
horizontal arm regions of the RMS. There were more TUNEL-positive cells ratio in the MTX
150 mg/kg group than in the MTX 5 mg/kg group. Treatment with MTX 150 mg/kg decreased the
cellularity in the vertical arm region on Postnatal day (PD) 4, but that with the MTX 5
mg/kg did not. TUNEL-positive cells ratio was the highest in the vertical arm region,
followed by elbow and horizontal regions in both MTX-treated groups. TUNEL-positive cells
ratio in the vertical arm and elbow regions reached their peaks on PD 4 in both
MTX-treated groups, and both MTX-treatments significantly decreased Phospho-Histone
H3-positive cells ratio on PDs 2.5 and 3 in the vertical arm, elbow and horizontal arm
regions. The phospho-Histone H3-positive cells ratio in the vertical arm region recovered
on PD4 in the MTX 150 mg/kg group. These findings suggested that RMS required a great
amount of folic acid on PD 2 and that the folic acid-requirement differed depending on the
anatomical region of the RMS. To our knowledge, this is the first report demonstrating the
effect of MTX on the RMS and the necessity of the folic acid metabolism on RMS development
in newborn rats. 相似文献
29.
ABSTRACT: Research on ghost fishing became active in the late 1980s. Ghost fishing has been confirmed for traps, gillnets, trammel-nets and small seine nets. Some lost traps are functional for a long period of time, even in shallow waters. Consequences for gillnets after loss depend on seabed conditions. The ghost fishing function of gillnets remaining on flat seabeds declines rapidly with decreasing heights and increasing visibility. Gillnets left tangled around an artificial reef, for example, three-dimensionally maintain the initial magnitude of ghost fishing for a long period of time, even after badly fouled. There are increasing numbers of researches working on the total number of mortality per gear after gear loss for gillnets and trammel-nets. It has become also possible to estimate the total number of mortality for a unit period of time in a certain fishing sector. This paper reviews research which has provided evidence and quantitative data on ghost fishing, and proposes five items important for future studies on ghost fishing. 相似文献
30.
Akihiko SUGIYAMA Jing SUN Kota UEDA Satoshi FURUKAWA Takashi TAKEUCHI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(7):789-797
Six-day-old rats were treated intraperitoneal injections with methotrexate 1
mg/kg, and the cerebellum was examined. Both the length and width of the vermis decreased
in the methotrexate-treated group instead of the control from 4 day after treatment (DAT)
onward. A significant reduction in the width of the external granular layer was detected
on 2 and 3 DAT in the methotrexate group. By 4 DAT, the width of the external granular
layer of the methotrexate group was indistinguishable from the control, and by 8 DAT, it
was greater than that of the control. The molecular layer of methotrexate group on 8 and
15 DAT was thinner than that of the control. On 1 DAT, in the methotrexate group, there
were many TUNEL and cleaved caspase-3-positive granular cells throughout the external
granular layer, and they decreased time-dependently. On 1 DAT, in the methotrexate group,
phospho-histone H3-positive cells in the external granular layer were fewer than in the
control and tended to increase on 2–4 DAT. The p21-positive-rate of the external granule
cells in the MTX group was higher than in the control on 1–4 DAT. These results suggested
that methotrexate exposure on postnatal day 6 induces a delay, slowing in the migration of
external granular cells to the inner granular layer, attributed to decrease or inhibition
in the production of external granular cells that had arisen from apoptosis and the
decrease in cell proliferative activity, resulting in cerebellar hypoplasia. 相似文献