全文获取类型
收费全文 | 241篇 |
免费 | 22篇 |
专业分类
林业 | 4篇 |
农学 | 10篇 |
24篇 | |
综合类 | 16篇 |
农作物 | 57篇 |
水产渔业 | 9篇 |
畜牧兽医 | 132篇 |
园艺 | 2篇 |
植物保护 | 9篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 12篇 |
2020年 | 8篇 |
2019年 | 6篇 |
2018年 | 4篇 |
2017年 | 7篇 |
2016年 | 8篇 |
2015年 | 14篇 |
2014年 | 13篇 |
2013年 | 21篇 |
2012年 | 20篇 |
2011年 | 20篇 |
2010年 | 15篇 |
2009年 | 10篇 |
2008年 | 7篇 |
2007年 | 10篇 |
2006年 | 5篇 |
2005年 | 8篇 |
2004年 | 6篇 |
2003年 | 4篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1998年 | 8篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1988年 | 2篇 |
1978年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有263条查询结果,搜索用时 671 毫秒
71.
H. Oui C. Lamm S. Stiver B. Williams S. Y. Kwon Y. Bae S. Jeon S. Park J. J. Min J. Choi 《The Journal of small animal practice》2014,55(7):379-382
A two‐year‐old female poodle with abdominal distention was diagnosed with concurrent enteric duplication cyst and lymphangiomatosis. Both lesions were shown as cystic structures, but some characteristic features of enteric duplication cyst were identified including a thick cyst wall and shared blood supply with the duodenum. Although it was challenging to discriminate between the types of cyst based on diagnostic imaging, this report describes the characteristics of each type of lesion using several different imaging modalities. 相似文献
72.
73.
Park PJ Heo SJ Park EJ Kim SK Byun HG Jeon BT Jeon YJ 《Journal of agricultural and food chemistry》2005,53(17):6666-6672
The free radical scavenging activity of water soluble natural antioxidants from Sargassum thunbergii, which is a brown marine alga, was evaluated by examining the radical scavenging activities of the extracts of hydrolyzates from S. thunbergii on hydroxyl, 1,1-diphenyl-2-picrylhydrazyl (DPPH), and alkyl radicals. A spin-trapping electron spin resonance (ESR) spectrometer was employed, and the results were compared for their ESR signal intensity. S. thunbergii was enzymatically hydrolyzed to prepare water soluble extracts by five carbohydrases (AMG, Celluclast, Termamyl, Ultraflo, and Viscozyme) and proteases (Alcalase, Flavorzyme, Kojizyme, Neutrase, and Protamex). The scavenging activity of the radicals increased with increased concentrations of the extracts. The scavenging results were higher for hydroxyl and alkyl radicals and lower for DPPH radical as compared with vitamin C as a reference. The hydrogen peroxide scavenging activity of the extracts was also investigated; the Alcalase extract showed the highest scavenging activity among the extracts prepared with the five proteases and five carbohydrates. In addition, the DNA damage was determined by using the comet assay with alkaline electrophoresis and was quantified by measuring the tail length. The preventive effect of Alcalase extract from S. thunbergii against DNA damage increased with increments of concentration of the enzymatic extracts. 相似文献
74.
Takanori Nakano Seo-Ryong Jeon Junko Shindo Tamon Fumoto Naoki Okada Jun Shimada 《Water, air, and soil pollution》2001,130(1-4):769-774
The 87Sr/86Sr ratios in rain at three sites in Japan were about 0.706 to 0.712, whereas those at one site in central Korea were higher (0.711 to 0.716), reflecting the difference in geology between the two countries. Because the 87Sr/86Sr ratios of exchangeable sites in soil minerals are indistinguishable from those of associated plants, aerosol Sr originating from both can be grouped together as plant-derived Sr. Spatial and temporal variations in 87Sr/86Sr and Sr/Ca ratios in the rain suggest the presence of plant-derived Sr and Ca in addition to Sr and Ca derived from sea-salt, acid-soluble aeolian carbonate from China, and cement-derived carbonate. However, systematic data on the 87Sr/86Sr ratios and elemental concentrations of soils, plants, fly-ash, and road dust are required to put reliable constraints on the provenance of atmospheric Ca. 相似文献
75.
Jee-Hyun Jung Yong-Chang Sohn Jae-Yong Lee Dae-Jung Kim Ji-Seon Lee Joong-Kyon Jeon Chang-Hee Han 《Fish physiology and biochemistry》2003,28(1-4):419-420
In this study, we have cloned a partial cDNA of 620 bases encoding a vitellogenin gene of rockfish (rfVTG), Sebastes schlegeli. The expression levels of rfVTG mRNA increased 48 h after the 4-nonylphenol (NP) treatment (10 mg/kg BW) in both sexes. On the other hand, the mRNA levels of rfVTG increased 48 h in males and 12 h in females after injection when higher dose (25 mg/kg BW) of 4-NP was applied. It suggested that 4-NP induced VTG gene expression in both male and female immature rockfish. Therefore, the cloned rfVTG cDNA in this study can be used as a tool for monitoring endocrine disruptors in rockfish. 相似文献
76.
Man Bo Lee Woong Bae Jeon Dae Yeon Kim Odgerel Bold Min Jeong Hong Yong Jin Lee Jae Han Park Yong Weon Seo 《Journal of Crop Science and Biotechnology》2011,14(4):233-238
Brachypodium distachyon (Brachypodium) is a novel model plant for structural and functional genomic studies of temperate grasses. Brachypodium as a model plant has many favorable features, such as small size, small genome, short life cycle, self-fertility, and simple
growth requirements. The genome sequence of the standard line Bd21 has been released and genomic resources have been developed.It
is imperative to develop a method for efficient Agrobacterium-mediated Brachypodium transformation. Yellowish and compact embryogenic calli derived from immature embryos of the Bd21 were transformed with the
Agrobacterium strain AGL1. Seven- and nine-week-old calli were used for transformation with Agrobacterium carrying either pCAMBIA 1301 and pCAUGH. Transformation efficiencies were assessed through histochemical GUS assay. The efficiency
of transformation with pCAMBIA 1301 (based on the number of callus lines producing GUS-detected plantlets and the number of
calli used for transformation) reached 20.1% (7-week-old calli) and 1.7% (9-week-old calli), and with pCAUGH (based on the
number of GUS-detected plantlets and the number of regenerants) 90 and 87% for 7- and 9-week-old calli, respectively. High
selection pressure was obtained by using pCAUGH, which is preferred for saving labor and time consumption during the callus
selection. 相似文献
77.
78.
JT SEAMAN WS TURVEY SJ OTTAWAY AR GILMOUR RJ DIXON† 《Australian veterinary journal》1989,66(9):279-285
A field grazing trial was undertaken to monitor the health and production of crossbred sheep grazing pasture where Echium plantagineum constituted a considerable proportion of the available forage. The trial, conducted for 19 months over successive grazing seasons, demonstrated a significant difference in production, with sheep on the E. plantagineum pasture being lighter and growing less wool compared with sheep on Echium-free pasture. No mortalities involving pyrrolizidine alkaloid poisoning were recorded in sheep grazing E. plantagineum, although there was histological evidence of moderately severe liver damage associated with high liver copper concentrations in at least one sheep following the grazing of large quantities of the plant. 相似文献
79.
80.