全文获取类型
收费全文 | 128篇 |
免费 | 5篇 |
专业分类
林业 | 26篇 |
农学 | 4篇 |
9篇 | |
综合类 | 9篇 |
农作物 | 10篇 |
水产渔业 | 13篇 |
畜牧兽医 | 57篇 |
园艺 | 3篇 |
植物保护 | 2篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2016年 | 2篇 |
2015年 | 5篇 |
2014年 | 3篇 |
2013年 | 14篇 |
2012年 | 1篇 |
2011年 | 4篇 |
2010年 | 8篇 |
2009年 | 8篇 |
2008年 | 1篇 |
2007年 | 6篇 |
2006年 | 5篇 |
2005年 | 4篇 |
2004年 | 6篇 |
2003年 | 10篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1972年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1954年 | 1篇 |
1918年 | 2篇 |
1915年 | 2篇 |
1913年 | 2篇 |
1912年 | 1篇 |
1911年 | 2篇 |
1910年 | 1篇 |
1905年 | 2篇 |
1903年 | 1篇 |
1901年 | 1篇 |
1897年 | 2篇 |
1896年 | 2篇 |
1895年 | 2篇 |
排序方式: 共有133条查询结果,搜索用时 171 毫秒
101.
Sang Phil Shin Han Chang Sohn Chang Nam Jin Bong Jo Kang Jehee Lee 《Journal of fish diseases》2019,42(2):159-165
Enteromyxum leei has been reported to cause emaciation disease in various fish species. To determine the effect of parasite intensity on cultured olive flounder Paralichthys olivaceus, we investigated the relationship between the relative condition factor (rCF = CF/standard CF × 100) and parasite load with quantitative polymerase chain reaction (qPCR) and the challenge test. A total of 57 cultured olive flounders were obtained from 11 fish farms and divided into five groups based on their rCF. We investigated the parasite intensity in the posterior intestine of the fish. The parasite load was closely matched to severe loss of body weight. In addition, olive flounders were inoculated either orally or anally with intestinal scrapings of infected fish or phosphate‐buffered saline. The fish were reared at natural water temperature and transferred to different tanks, and the water temperature was adjusted to 20°C after 6 weeks of inoculation. When the water temperature was increased to 20°C, the rCF decreased in the experimentally infected group. The results demonstrated that qPCR can be utilized to determine the relative abundance of E. leei in olive flounders and water temperature is an important factor to track the progress of the emaciation disease. 相似文献
102.
Fourier‐transform Raman (FT‐Raman) spectroscopy and near‐infrared (NIR) reflectance spectroscopy were used to compare calibration models for determining rice cooking quality parameters such as apparent amylose and protein. Samples from two seasons were used in each calibration set. The laboratory values ranged from 4.89 to 12.48% for protein and from 0.2 to 25.7% for amylose. The data for both FT‐Raman and NIR were preprocessed with orthogonal signal correction (OSC) for standardization. For both spectroscopic methods, five models were optimized by partial least squares regression (PLSR) and by Martens' uncertainty regression (MUR), including no processing, smoothing, normalization, first derivative (D1), and second derivative (D2). Based solely on standard error of cross‐validation (SECV), the FT‐Raman method was superior to the NIR method for protein. For amylose, the FT‐Raman and NIR methods resulted in similar calibration statistics with a high precision, with the FT‐Raman requiring fewer factors. The best FT‐Raman models were generated from OSC preprocessing with MUR for protein (SECV 0.15%, five factors) and from OSC without MUR for amylose (SECV 0.70%, seven factors). The best NIR models were obtained with D2 transform of OSC spectra for protein (SECV 0.22%, four factors) and with OSC spectra for amylose (SECV 0.57%, 11 factors). 相似文献
103.
Kiyoon Kang Kyungjin Lee Sung-Oh Sohn Sangkyu Park Sungbeom Lee Soo Young Kim Young Soon Kim Kyoungwhan Back 《Scientia Horticulturae》2009,120(4):504-510
Tomato contains high levels of amines such as serotonin and tyramine and is a suitable host to enhance phenylpropanoid amides (PAs), an important class of nutraceuticals with strong antioxidant activity and chemotherapeutic effects, by ectopic expression of the corresponding gene, serotonin N-hydroxycinnamoyltransferase (SHT). To assess whether ectopic overexpression of SHT cDNA under the control of the CaMV 35S promoter would enhance levels of PAs, we generated transgenic tomato plants and analyzed the levels of PAs. Transgenic tomato plants exhibited increased synthesis of PAs such as feruloylserotonin (FS), 4-coumaroylserotonin (CS), feruloyltyramine (FT), 4-coumaroyltyramine (CT), and feruloyloctopamine (FO) in 1-month-old leaves compared to the wild type. The increase and relative levels of PAs were even more apparent in 3-month-old leaves of transgenic tomato. When tomato leaves were challenged by wounding, levels of PAs in the best transgenic line increased by 3- and 10-fold for CS + FS and CT + FT, respectively. In contrast to leaves, tomato fruit only showed enhanced synthesis of CT + FT, whereas CS + FS levels were not enhanced. Regarding amine content, the levels of tyramine were much higher than those of serotonin in tomato leaves and fruits. The high levels of tyramine may contribute to the preferential production of CT + FT rather than CS + FS, although SHT enzyme shows the highest substrate affinity toward serotonin rather than tyramine. 相似文献
104.
Heinrich Keller Sohn 《European Journal of Forest Research》1915,37(10):476-476
105.
Heinrich Keller Sohn 《Forstwissenschaftliches Centralblatt》1897,19(4):234-235
Ohne Zusammenfassung 相似文献
106.
Heinrich Keller Sohn 《Forstwissenschaftliches Centralblatt》1918,40(1):39-40
Ohne Zusammenfassung 相似文献
107.
108.
Xinhua Zhao Yang Qin Baoyan Jia Suk-Man Kim Hyun-Suk Lee Moo-Young Eun Kyung-Min Kim Jae-Keun Sohn 《Journal of Crop Science and Biotechnology》2010,13(4):235-241
Two genetic linkage maps based on doubled haploid (DH) and recombinant inbred lines (RILs) populations, derived from the same
indica-japonica cross ‘Samgang × Nagdong’, were constructed to analyze the quantitative trait loci (QTLs) affecting agronomic traits in rice.
The segregations of agronomic traits in RILs population showed larger variations than those in DH population. A total of 10
and 12 QTLs were identified on six chromosomes using DH population and seven chromosomes using RILs population, respectively.
Three stable QTLs including pl9.1, ph1.1, and gwp11.1 were detected through different years. The percentages of phenotypic variation explained by individual QTLs ranged from 8
to 18% in the DH population and 9 to 33% in the RILs population. Twenty-three epistatic QTLs were identified in the DH population,
while 21 epistatic QTLs were detected in the RILs population. Epistatic interactions played an important role in controlling
the agronomic traits genetically. Four significant main-effect QTLs were involved in the digenic interactions. Significant
interactions between QTLs and environments (QE) were identified in two populations. The QTLs affecting grain weight per panicle
(GWP) were more sensitive to the environmental changes. The comparison and QTLs analysis between two populations across different
years should help rice breeders to comprehend the genetic mechanisms of quantitative traits and improve breeding programs
in marker-assisted selection (MAS). 相似文献
109.
Phlorotannins are secondary metabolites produced by brown seaweeds with antiviral, antibacterial, antifungal, and larvicidal activities. Phlorotannins’ structures are formed by dibenzodioxin, ether and phenyl, ether, or phenyl linkages. The polymerization of phlorotannins is used to classify and characterize. The structural diversity of phlorotannins grows as polymerization increases. They have been characterized extensively with respect to chemical properties and functionality. However, review papers of the biological activities of phlorotannins have focused on their antibacterial and antiviral effects, and reviews of their broad antifungal and larvicidal effects are lacking. Accordingly, evidence for the effectiveness of phlorotannins as antifungal and larvicidal agents is discussed in this review. Online databases (ScienceDirect, PubMed, MEDLINE, and Web of Science) were used to identify relevant articles. In total, 11 articles were retrieved after duplicates were removed and exclusion criteria were applied. Phlorotannins from brown seaweeds show antifungal activity against dermal and plant fungi, and larvicidal activity against mosquitos and marine invertebrate larvae. However, further studies of the biological activity of phlorotannins against fungal and parasitic infections in aquaculture fish, livestock, and companion animals are needed for systematic analyses of their effectiveness. The research described in this review emphasizes the potential applications of phlorotannins as pharmaceutical, functional food, pesticide, and antifouling agents. 相似文献
110.
Dong-Sung Lee Jae-Hyuk Jang Wonmin Ko Kyoung-Su Kim Jae Hak Sohn Myeong-Suk Kang Jong Seog Ahn Youn-Chul Kim Hyuncheol Oh 《Marine drugs》2013,11(4):1409-1426
Protein tyrosine phosphatase 1B (PTP1B) plays a major role in the negative regulation of insulin signaling, and is thus considered as an attractive therapeutic target for the treatment of diabetes. Bioassay-guided investigation of the methylethylketone extract of marine-derived fungus Penicillium sp. JF-55 cultures afforded a new PTP1B inhibitory styrylpyrone-type metabolite named penstyrylpyrone (1), and two known metabolites, anhydrofulvic acid (2) and citromycetin (3). Compounds 1 and 2 inhibited PTP1B activity in a dose-dependent manner, and kinetic analyses of PTP1B inhibition suggested that these compounds inhibited PTP1B activity in a competitive manner. In an effort to gain more biological potential of the isolated compounds, the anti-inflammatory effects of compounds 1–3 were also evaluated. Among the tested compounds, only compound 1 inhibited the production of NO and PGE2, due to the inhibition of the expression of iNOS and COX-2. Penstyrylpyrone (1) also reduced TNF-α and IL-1β production, and these anti-inflammatory effects were shown to be correlated with the suppression of the phosphorylation and degradation of IκB-α, NF-κB nuclear translocation, and NF-κB DNA binding activity. In addition, using inhibitor tin protoporphyrin (SnPP), an inhibitor of HO-1, it was verified that the inhibitory effects of penstyrylpyrone (1) on the pro-inflammatory mediators and NF-κB DNA binding activity were associated with the HO-1 expression. Therefore, these results suggest that penstyrylpyrone (1) suppresses PTP1B activity, as well as the production of pro-inflammatory mediators via NF-κB pathway, through expression of anti-inflammatory HO-1. 相似文献