全文获取类型
收费全文 | 189篇 |
免费 | 3篇 |
专业分类
林业 | 37篇 |
农学 | 10篇 |
24篇 | |
综合类 | 13篇 |
农作物 | 9篇 |
水产渔业 | 13篇 |
畜牧兽医 | 68篇 |
园艺 | 2篇 |
植物保护 | 16篇 |
出版年
2022年 | 1篇 |
2021年 | 6篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 6篇 |
2017年 | 2篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 10篇 |
2012年 | 10篇 |
2011年 | 8篇 |
2010年 | 5篇 |
2009年 | 10篇 |
2008年 | 19篇 |
2007年 | 9篇 |
2006年 | 9篇 |
2005年 | 17篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 8篇 |
2001年 | 9篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1996年 | 1篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有192条查询结果,搜索用时 15 毫秒
41.
Nakamura Masato Oritate Fumiko Yuyama Yoshito Yamaoka Masaru Dan Nguyen Phuoc Hanh Dang Vu Bich 《Paddy and Water Environment》2018,16(1):193-198
Paddy and Water Environment - In some areas of Vietnam, digested slurry from biogas digesters is discharged into canals without wastewater treatment. In order to reduce environmental pollution,... 相似文献
42.
Fumiko TAGUCHI Rui TANAKA Sayuri KINOSHITA Yuki ICHINOSE Yoshiyuki IMURA Salamah ANDI Kazuhiro TOYODA Tomonori SHIRAISHI Tetsuji YAMADA 《Journal of General Plant Pathology》2001,67(2):116-123
To elucidate the role of harpins produced by Pseudomonas syringae, the corresponding hrpZ gene was isolated from P. s. pv. tabaci. The sequence information revealed that this gene carries a serious mutation with 326 bp lacking in the central region and
potentially encodes only 140 N-terminal amino acids because of a frame shift. The investigation of biological properties using
recombinant harpin indicated harpinpsta was incapable of inducing HR in both host and nonhost plants. Based on an immunoblot analysis to detect harpin from P. s. pathovars in hrp-inducing medium, the truncated harpinpsta was neither expressed nor secreted into the culture medium. These results suggest that harpin is not the sole determinant
of the host-parasite specificity in P. s. pv. tabaci.
Received 10 August 2000/ Accepted in revised form 21 December 2000 相似文献
43.
Junichi Kikuchi Souichirou Iida Tamio Akema Kazuyoshi Futai 《Journal of Forest Research》1996,1(1):37-40
The process of decrease in seedlings of Japanese red pine (Pinus densiflora Sieb.et Zucc.) and the effect of litter and humus layers on the mortality were studied in their stand and adjacent bare land. After
the rainy season, only small number of individuals died in the bare land but more seedlings died in the forest. The number
of seedlings killed by drought was greater in the forest than in the bare land. The population of naturally occurring current
year seedlings was larger in the forest than in the bare land, but that of 1- to 5-year-old seedlings was smaller. Severe
summer drought exceeding the permanent wilting point was observed only in the forest F-H horizon where greater part of seedling
roots distributed, this may be one of major mortality factors. Inhibitory substances to seedling growth in fresh fallen pine
needles were also suggested. 相似文献
44.
Sudijono Dwianto Wahyu Yusuf Sulaeman Iida Ikuho Furuta Yuzo Minato Kazuya 《Journal of Wood Science》2004,50(4):371-374
Mechanical property changes due to the moisture content (MC) and/or temperature changes were examined for 15 Indonesian wood species. A static bending test was carried out at 20°C, 65% relative humidity (air-dry), and water-saturated at 20°C (wet-20) and 80°C (wet-80). For individual test conditions, modulus of elasticity (MOE) and modulus of rupture (MOR) increased linearly with specific gravity regardless of wood species; however, maximum deflection did not correlate with specific gravity for any MC or temperature conditions. The relative values of MOE and MOR measured in wet-20 to air-dry conditions were variously affected from slightly to strongly depending on the wood species. However, the relative values always decreased markedly when saturated in water at 80°C, regardless of wood species. The relative MOE, MOR, and maximum deflection values due to the change in MC or MC and temperature combined were independent of specific gravity but may be dependent on wood type: softwood or hardwood. 相似文献
45.
Circular saw construction using materials with high internal damping has been found to be an effective way to suppress whistling noise during saw idling. A high-damping alloy called Silentalloy (12Cr-3Al-Fe) was previously shown to be an effective material for this purpose. Tests with Silentalloy suggested that a logarithmic decrement of at least 0.07 is needed. Silentalloy does have some disadvantages, such as modest strength, difficult heat treatability, and special order status. The purpose of these experiments was to confirm the general applicability of the minimum effective logarithmic decrement of 0.07 and to find more practical metals for saw-blade construction. Three commercially available metals of different damping capacity were selected. The idling noises of saws made of these metals were compared with those of saws made of typical saw steel and Silentalloy. The minimum logarithmic decrement for whistling-noise suppression was found to be approximately 0.01. On a logarithmic scale, this value is similar to the 0.07 value previously found for a Silentalloy saw. A ferromagnetic steel (20Cr-3A1-Fe) was found to be a useful alternative to Silentalloy from the viewpoint of strength, but the cost of this steel makes it unsuitable for mass production. The success in identifying an effective alternative material to Silentalloy provides encouragement for the identification of other high-damping alloys among the 13Cr-Fe to 18Cr-Fe series without the cost disadvantage of ferromagnetic steel. 相似文献
46.
In order to understand the mechanism of destabilization occurring when wood is quenched, we applied chemical modifications,
and controlled the number of moisture adsorption sites in wood. The degree of destabilization was evaluated according to the
fluidity (1-E
t/E
0), increase in fluidity, and relative fluidity in relation to the nonmodified wood, and was discussed by comparing these quantities
with the hygroscopicity or swelling of wood. We found that destabilization of chemically modified wood was lower than that
in nonmodified wood, and the amount of adsorbed water controlled the magnitude of flow of wood. Moreover, according to the
analysis of water state by the Hailwood-Horrobin equation, it was shown that the function of dissolved water to the fluidity
is almost identical for both chemical modifications, whereas hydrated water has more effect on acetylated wood than on formaldehydetreated
wood. We speculate that the motion of water molecules due to quenching accompanied with the redistribution of energy resulting
from the exchange of their potential energy and movement to attain a new balance, and the introduced acetyl groups and cross-linking
restrict the water molecule movement.
An erratum to this article is available at . 相似文献
47.
Yutaka Ishimaru Kazutoshi Arai Masato Mizutani Katsuhito Oshima Ikuho Iida 《Journal of Wood Science》2001,47(3):185-191
Some properties of wood (hinoki:Chamaecyparis obtusa) moisture-conditioned by an adsorption process from a dry state and by two desorption processes (from a water-saturated state and from a state with a moisture content slightly below the fiber saturation point) were investigated. The moisture contents of wood conditioned by the adsorption process and by the desorption process continued to approach to one another for the moisture-conditioning period of over 50 weeks. Accordingly, sorption hysteresis should be regarded as a transitional phenomenon that occurs during the process of approaching the true equilibrium, which requires a long time. The wood conditioned by the desorption process beginning from a water-saturated state showed slightly smaller dimensions than those conditioned by the adsorption process with the same moisture content; however, the wood conditioned by the desorption process from a moisture content below the fiber saturation point showed slightly larger dimensions than those conditioned by the adsorption process. The wood conditioned by the adsorption process from a dry state showed a higher modulus of elasticity and modulus of rupture than did the wood conditioned from a water-saturated state with the same moisture content. The mechanical properties of the wood also varied based on the states at which the desorption process was started. This is a notable characteristic of the relation between the drying condition and the mechanical properties of wood. 相似文献
48.
Monobe M Ema K Kato F Hirokane H Maeda-Yamamoto M 《Journal of agricultural and food chemistry》2007,55(7):2543-2547
A technique for screening immune-enhancing polysaccharides in food using the phagocytotic activity of 1,25-dihydroxyvitamin D3 (VD3)-differentiated HL60 cells is presented. HL60 cells, a human acute promyelocytic cell line, can differentiate along the monocytic lineage following exposure to VD3 or phorbol-12-myristate-13-acetate (PMA). For differentiated cells along the monocytic pathway, HL60 cells were maintained in RPMI 1640 medium supplemented with 10% FBS and 120 nM VD3 for more than 1 week. VD3-differentiated HL60 cells were seeded into 48-well plates, YG-labeled microspheres and polysaccharides were added and mixed using a plate shaker at 1100 rpm for 30 s, and then the mixture was incubated overnight at 37 degrees C in 5% CO2. The cells were fixed with 2% formaldehyde and resuspended in phosphate-buffered saline. The rate of phagocytosis was measured with a flow cytometer. VD3-differentiated cells but not non- and PMA-differentiated cells resulted in an elevation of phagocytic activity by various immune-enhancing polysaccharides in foods. 相似文献
49.
Ageyama N Hanazono Y Shibata H Ono F Nagashima T Ueda Y Yoshikawa Y Hasegawa M Ozawa K Terao K 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2006,68(5):507-510
Genes and proteins of human origin are often administered to monkeys for research purposes, however, it can be difficult to obtain sufficient levels of the products in vivo due to immunological clearance. In this study, we showed that human erythropoietin (hEPO) induces generation of anti-hEPO antibody in cynomolgus macaques (n=2), although 92% of amino acid residues are common between the human and macaque EPO. The administered hEPO was thus eliminated from the animals. On the other hand, when an immunosuppressant, cyclosporin A (CyA), was administered (6 mg/kg) intramuscularly every other day in combination with hEPO (n=2), no anti-hEPO antibody was generated and high serum levels of hEPO were obtained during administration of hEPO, resulting in an increase in serum hemoglobin levels. No adverse effects associated with CyA were observed. Thus, CyA treatment is useful for prevention of immune responses associated with the administration of human proteins in monkeys. 相似文献
50.
Takai S Zhuang D Huo XW Madarame H Gao MH Tan ZT Gao SC Yan LJ Guo CM Zhou XF Hatori F Sasaki Y Kakuda T Tsubaki S 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2006,68(7):739-742
Little is known about the distribution of Rhodococcus equi in the soil environment of native horses in China. One hundred and eight soil samples were collected from native-horse farms in the Hulun Beier grasslands of eastern Mongolia, the Xilin Goler grasslands of southern Mongolia, and Tongliao City in Inner Mongolia, China. The isolation rates of R. equi from soil samples from the Hulun Beier and Xilin Goler grasslands ranged from 25.9% to 30.0%. In contrast, isolation rates from soil samples from Tongliao City were as high as 82.3% and the mean number of R. equi in soil samples from Tongliao City was 10 times more than those of samples from the grasslands. The 488 isolates were examined using PCR for the presence of genes that encode virulence-associated 15-17 kDa antigen protein (VapA) and the 20 kDa antigen protein (VapB). All isolates were negative for virulence-associated proteins. Plasmid profiles of these avirulent isolates showed that cryptic plasmids of various sizes were present with an incidence of 13.3% to 21.5%. The results of the present study contrast with those of our recent study (J. Vet. Med. Sci. 67:611-613, 2005), in which we reported that R. equi was absent from Mongolian horses in Ulaanbaatar, Mongolia. It is suggested that the difference between the results of these two studies is due to the mobile pasturing system in Mongolia and nonmobile pasturing system in Inner Mongolia. 相似文献