全文获取类型
收费全文 | 62篇 |
免费 | 2篇 |
专业分类
林业 | 4篇 |
农学 | 3篇 |
23篇 | |
综合类 | 7篇 |
农作物 | 2篇 |
水产渔业 | 6篇 |
畜牧兽医 | 11篇 |
园艺 | 3篇 |
植物保护 | 5篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 6篇 |
2018年 | 4篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2014年 | 5篇 |
2013年 | 1篇 |
2012年 | 3篇 |
2011年 | 2篇 |
2010年 | 2篇 |
2009年 | 1篇 |
2008年 | 5篇 |
2007年 | 5篇 |
2006年 | 5篇 |
2005年 | 5篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 2篇 |
1999年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
排序方式: 共有64条查询结果,搜索用时 15 毫秒
61.
The use of visible (vis) and near-infrared spectroscopy (NIR) was explored as a tool to discriminate between samples of Australian commercial white wines of different varietal origins (Chardonnay and Riesling). Discriminant models were developed using principal component analysis (PCA), principal component regression (PCR), and discriminant partial least-squares (DPLS) regression. The samples were randomly split into two sets, one used as a calibration set (n = 136) and the remaining samples as a validation set (n = 133). When used to predict the variety of the validation set samples, the DPLS models correctly classified 100% of Riesling and up to 96% of Chardonnay wines. These results showed that vis-NIR might be a suitable and alternative technology that can be easily implemented by the wine industry to discriminate Riesling and Chardonnay commercial wine varieties. However, the relatively limited number of samples and varieties involved in the present work suggests caution in extending the potential of such a technique to other wine varieties. 相似文献
62.
Lene?K.?ChristensenEmail author Shrinivasa?K.?Upadhyaya Bernie?Jahn David?C.?Slaughter Eunice?Tan David?Hills 《Precision Agriculture》2005,6(6):539-550
A necessary pre-requisite for variable rate application of plant nutrients to manage inputs in a site-specific manner is a
technique to detect nutrient stresses in plants in real-time. Spectral reflectance of plant canopy may provide a non-destructive
and rapid technique to detect nutrient and water stress in plants. In this study, we investigated the effect of water on nutrient
stress discrimination (nitrogen, N; phosphorus, P; and potassium, K) based on the visible and near infrared reflectance of
maize leaves grown under controlled greenhouse conditions. The analysis of the spectral data indicated that it was challenging
to detect the nutrient deficiencies if the plant water status was unknown. However, if a priori knowledge of water stress
existed, such as a well-watered situation, the ability to discriminate nutrient stress improved significantly. The analysis
of whole plant behaviour (i.e., mean reflectance data from all leaves within a plant) versus leaves located at a specific
location within a plant indicated that knowledge of spatial location of leaves within a plant helped to identify N and P stress
and NPK as a multi-stress condition more clearly. 相似文献
63.
Alizadeh-Pasdar N Nakai S Li-Chan EC 《Journal of agricultural and food chemistry》2002,50(21):6042-6052
Raman spectroscopy was used to elucidate structural changes of beta-lactoglobulin (BLG), whey protein isolate (WPI), and bovine serum albumin (BSA), at 15% concentration, as a function of pH (5.0, 7.0, and 9.0), heating (80 degrees C, 30 min), and presence of 0.24% kappa-carrageenan. Three data-processing techniques were used to assist in identifying significant changes in Raman spectral data. Analysis of variance showed that of 12 characteristics examined in the Raman spectra, only a few were significantly affected by pH, heating, kappa-carrageenan, and their interactions. These included amide I (1658 cm(-1)) for WPI and BLG, alpha-helix for BLG and BSA, beta-sheet for BSA, CH stretching (2880 cm(-1)) for BLG and BSA, and CH stretching (2930 cm(-1)) for BSA. Principal component analysis reduced dimensionality of the characteristics. Heating and its interaction with kappa-carrageenan were identified as the most influential in overall structure of the whey proteins, using principal component similarity analysis. 相似文献
64.
Marco A. De León-Nava Eunice Romero-Nú?ez Angélica Luna-Nophal Johanna Bernáldez-Sarabia Liliana N. Sánchez-Campos Alexei F. Licea-Navarro Jorge Morales-Montor Saé Mu?iz-Hernández 《Marine drugs》2016,14(4)
Toxins that are secreted by cone snails are small peptides that are used to treat several diseases. However, their effects on parasites with human and veterinary significance are unknown. Toxoplasma gondii is an opportunistic parasite that affects approximately 30% of the world’s population and can be lethal in immunologically compromised individuals. The conventional treatment for this parasitic infection has remained the same since the 1950s, and its efficacy is limited to the acute phase of infection. These findings have necessitated the search for new drugs that specifically target T. gondii. We examined the effects of the synthetic toxin cal14.1a (s-cal14.1a) from C. californicus on the tachyzoite form of T. gondii. Our results indicate that, at micromolar concentrations, s-cal14.1a lowers viability and inhibits host cell invasion (by 50% and 61%, respectively) on exposure to extracellular parasites. Further, intracellular replication decreased significantly while viability of the host cell was unaffected. Our study is the first report on the antiparasitic activity of a synthetic toxin of C. californicus. 相似文献