全文获取类型
收费全文 | 122篇 |
免费 | 0篇 |
专业分类
林业 | 4篇 |
农学 | 5篇 |
39篇 | |
综合类 | 3篇 |
农作物 | 7篇 |
水产渔业 | 3篇 |
畜牧兽医 | 59篇 |
植物保护 | 2篇 |
出版年
2022年 | 4篇 |
2021年 | 9篇 |
2020年 | 2篇 |
2019年 | 6篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 5篇 |
2013年 | 16篇 |
2012年 | 7篇 |
2011年 | 7篇 |
2010年 | 3篇 |
2009年 | 6篇 |
2008年 | 8篇 |
2007年 | 8篇 |
2006年 | 5篇 |
2005年 | 5篇 |
2004年 | 7篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1985年 | 1篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1968年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有122条查询结果,搜索用时 531 毫秒
41.
Ryohei Suzuki Hirotaka Matsumoto Takahiro Teshima Hidekazu Koyama 《Journal of Veterinary Cardiology》2013,15(4):243-252
ObjectivesThe objective of this study was to evaluate the effect of age on myocardial function assessed by two-dimensional speckle-tracking echocardiography (2D-STE) in healthy dogs.AnimalsThirty-two healthy Beagles were used.MethodsMyocardial function was assessed in each dog by using 2D-STE, and the results were compared between young and old dogs.ResultsThe myocardial deformations in systole, besides the apical rotation rate, were not significantly different between young and old dogs. In contrast, the early diastolic circumferential strain rate, basal rotation rate, and torsion rate were significantly lower in old dogs than in young dogs (P = 0.03, P = 0.033, and P = 0.015, respectively). Late diastolic longitudinal and radial strain rates were significantly higher in old dogs than in young dogs (P = 0.002 and P = 0.018, respectively).ConclusionsYoung and old dogs showed similar systolic myocardial deformations, but significant differences in the values of some diastolic deformation variables were found between young and old dogs, highlighting the need for using age-matched control subjects in studies of diastolic function. 相似文献
42.
Takahiro Teshima Hirotaka Matsumoto Kae Shigihara Harumi Sawada Masaki Michishita Kimimasa Takahashi Hidekazu Koyama 《The Canadian veterinary journal. La revue veterinaire canadienne》2013,54(9):845-848
A 25-month-old Chihuahua dog with no clinical signs was evaluated for high serum liver enzymes. Ultrasonography and computed tomography revealed a mass in the left hepatic medial lobe. The histological diagnosis reached using resected tissues was hepatocellular carcinoma (HCC). To the authors’ knowledge, this is the youngest dog diagnosed with HCC. 相似文献
43.
Ryunosuke Tateno Keitaro Fukushima Reiji Fujimaki Tetsuya Shimamura Masami Ohgi Hirotsugu Arai Nobuhito Ohte Naoko Tokuchi Takahito Yoshioka 《Journal of Forest Research》2009,14(5):276-285
We investigated soil net nitrogen mineralization rate, above- and belowground biomass allocation, and nitrogen use in a Cryptomeria japonica plantation chronosequence. Total biomass accumulation showed an asymptotic accretion pattern, and the peak total biomass
accumulation rate occurred approximately 30 years after afforestation. Soil net nitrogen mineralization rate was lowest 30 years
after afforestation. Between years 30 and 88, net nitrogen mineralization increased again. These results indicate that an
imbalance in soil nitrogen supply and plant nitrogen demand occurred approximately 30 years after afforestation. Furthermore,
leaf nitrogen concentration, which was used as an index of plant nitrogen status, was lower in mature forest than in young
forest, suggesting that mature stands did not take up nitrogen as successfully. If soil resources such as nitrogen limit plant
growth, plants may increase biomass allocation to fine root structure; however, fine root biomass was not higher in 30- and
88-year-old stands than in younger stands, suggesting that changes in biomass allocation may not be effective against nitrogen
deficiency in a C. japonica plantation chronosequence. 相似文献
44.
Reiji Fujimaki Akiyuki Kawasaki Yoshikazu Fujii Nobuhiro Kaneko 《Journal of Forest Research》2008,13(6):380-385
The water chemistry of 51 headwater streams was studied in the Tanzawa Mountains, western fringe of Southern Kanto Plain,
Japan. The relationships to soil N processes and catchment topography were also evaluated using a geographic information system
with fine-scale map data. The average concentration of total dissolved N was 0.74 mg-N L−1, of which 95% consisted of NO3
−-N. Stream N concentrations were not different among bedrock geologies and among vegetations of the catchments. Stream NO3
−-N marginally correlated to soil nitrification. Stream NO3
−-N also tended to be high in areas with steep and south-facing slopes. These results imply that N transport from Tanzawa forest
ecosystems is related to hydrological and biological processes associated with catchment topography.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
45.
46.
Eurasian Soil Science - Soil salinity is an increasing threat to agriculture and is a major factor in reducing plant productivity in arid and semi-arid regions. Knowledge of the transport process... 相似文献
47.
Takuo Hishi Reiji Fujimaki Terence P. McGonigle Hiroshi Takeda 《European Journal of Soil Biology》2008,44(5-6):473
The relationships between roots and soil communities are not well understood. We used the ingrowth-core method with L-, FH-, and M-layer substrates to investigate the relationships among soil organic carbon, fine root biomass, hyphal length and the numbers of soil microarthropods. The study was carried out in a temperate forest of the arbuscular mycorrhizal conifer, Chamaecyparis obtusa. The relationships among fine roots, fungi and soil microarthropods were different among soil substrates and faunal taxa. Soil carbon contents, fine root biomass, hyphal length and soil-microarthropod numbers were the highest in the FH-substrate, and the lowest in the M-substrate. For each substrate, the total numbers of soil microarthropods did not positively correlated with soil organic carbon. A positive correlation between fine root biomass and the soil microarthropod numbers was significant only in the M-substrate, but not in the L- and FH-substrates. In M-substrates, strong positive correlations were found between fine root biomass or hyphal length and Mesostigmata or Oribatida numbers, but Collembola numbers were not corelated. Further studies of the regulation mechanism of soil food web structures should note that the soil microarthropods have different responses to C sources according to soil conditions and trophic interactions. 相似文献
48.
Sari DK Kuwahara S Furuya M Tsukamoto Y Hori H Kunugita N Arashidani K Fujimaki H Sasaki F 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2005,67(3):303-309
We studied the change in the hypothalamo-pituitary-adrenal gland (HPA) axis upon adding prior toluene inhalation to our previous formaldehyde inhalation experiments to determine whether short term exposure to relatively high levels of toluene triggers multiple chemical sensitivity (MCS). Data come from immunocytochemical, morphometrical and RT-PCR measurements. Four groups of adult female mice were exposed to differing concentrations (0, 80, 400, and 2,000 ppb) of formaldehyde for 16 hr/day, 5 days/week for twelve weeks, after the mice were exposed intranasally to 500 ppm toluene per mouse for 6 hr/day, for 3 days. We found that the number of corticotropin releasing hormone (CRH)-immunoreactive (ir) neurons was up-regulated according to the amount of formaldehyde as well as inhalation of formaldehyde alone in our previous experiment. The proportion of adrenocorticotropin hormone (ACTH)-ir cells increased according to the formaldehyde concentration, though there was no significant difference between the 400 and 2,000 groups. The number of ACTH-ir cells was higher in the 400 group than in the other groups (0, 80, and 2,000). Expression of ACTH-mRNA was also up-regulated according to the quantity of formaldehyde. The sinusoid in the anterior pituitary showed more dilatation in the 400 and 2,000 groups than in the control group, especially in the 2,000 group. We propose that exposure to toluene prior to inhalation of formaldehyde has no effect on the HPA axis and as a trigger of MCS, although greater sinusoid dilatation was found in the anterior pituitary gland at higher concentrations of formaldehyde. 相似文献
49.
Tomioka Keisuke Asami Hidenori Chiba Masahiro Kobayashi Hidekazu Nagata Kenji Mori Shinsuke Yamazaki Ryo Kawasaki Yohei Yasumoto Satoko Masunaka Akira Sekiguchi Hiroyuki Ishikawa Naoyuki 《Journal of General Plant Pathology》2021,87(5):281-286
Journal of General Plant Pathology - Brown lesions were found on leaves of the weed barnyardgrass in paddy fields in Hiroshima Prefecture in western Japan in June 2017. A fungus, isolated... 相似文献
50.
Takanori Ueno Hidekazu Niwa Yuta Kinoshita Yoshinari Katayama Seiji Hobo 《Journal of Equine Veterinary Science》2014
Pneumocystis pneumonia is an opportunistic respiratory infection that occurs in immunocompromised animals. In horses, pneumocystic pneumonia is observed mostly in foals and often progresses rapidly. Here, we report pneumocystic pneumonia in a Thoroughbred racehorse. A 3-year-old Thoroughbred racehorse colt had marked respiratory symptoms for 3 weeks and was unresponsive to antibiotic treatment. At necropsy, firm, tan, patchy lesions were scattered diffusely in the lungs. Microscopically, alveolar septa thickened by proliferation of collagen fibers and infiltration of inflammatory cells were observed. In the alveolar spaces, many brown-black yeast-like organisms similar to cystic forms of Pneumocystis carinii were recognized by staining with Gomori's methenamine silver. Bronchoalveolar lavage fluid (BALF) obtained before necropsy included macrophages engulfing the fungus bodies. Amplified products were obtained from BALF and lung tissue samples by Pneumocystis-specific nested PCR. Phylogenetic analysis based on the 18S rRNA gene sequence revealed that the P. carinii organism from BALF was related to the Pneumocystis spp. detected in other animals and was especially close to P. carinii derived from ferrets. This is a rare case of pneumocystic pneumonia in a colt with chronic pulmonary lesions. 相似文献