全文获取类型
收费全文 | 654篇 |
免费 | 47篇 |
专业分类
林业 | 11篇 |
农学 | 15篇 |
48篇 | |
综合类 | 108篇 |
农作物 | 29篇 |
水产渔业 | 101篇 |
畜牧兽医 | 337篇 |
园艺 | 12篇 |
植物保护 | 40篇 |
出版年
2023年 | 7篇 |
2021年 | 7篇 |
2020年 | 14篇 |
2019年 | 12篇 |
2018年 | 20篇 |
2017年 | 13篇 |
2016年 | 8篇 |
2015年 | 15篇 |
2014年 | 13篇 |
2013年 | 34篇 |
2012年 | 27篇 |
2011年 | 18篇 |
2010年 | 22篇 |
2009年 | 18篇 |
2008年 | 18篇 |
2007年 | 26篇 |
2006年 | 17篇 |
2005年 | 22篇 |
2004年 | 17篇 |
2003年 | 21篇 |
2002年 | 25篇 |
2001年 | 11篇 |
2000年 | 10篇 |
1999年 | 14篇 |
1998年 | 23篇 |
1997年 | 12篇 |
1996年 | 13篇 |
1995年 | 18篇 |
1994年 | 8篇 |
1993年 | 7篇 |
1992年 | 15篇 |
1991年 | 17篇 |
1990年 | 13篇 |
1989年 | 18篇 |
1988年 | 5篇 |
1987年 | 10篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 9篇 |
1979年 | 7篇 |
1978年 | 5篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1974年 | 6篇 |
1971年 | 8篇 |
1970年 | 8篇 |
1896年 | 5篇 |
1884年 | 4篇 |
排序方式: 共有701条查询结果,搜索用时 62 毫秒
61.
62.
63.
Analysis of several well-documented specimens from each of the three volcanic series on Oahu gives the following mean ratios of Sr(87) to Sr(86): the Waianae series, 0.7030 +/- 0.00010 (sigma); the Koolau series, 0.70385+/- 0.00009 (sigma); and the Honolulu series, 0.7029 ++/- 0.00006 ( sigma). The mean ratio of Sr(87) to Sr(86) of the Koolau series specimens is significantly higher than the means of the other two series. With one exception, significant differences in Sr(87)/ Sr(86) within a series were not found, even though some large compositional differences existed. 相似文献
64.
Spatial Variability of Turbulent Mixing in the Abyssal Ocean 总被引:3,自引:0,他引:3
Ocean microstructure data show that turbulent mixing in the deep Brazil Basin of the South Atlantic Ocean is weak at all depths above smooth abyssal plains and the South American Continental Rise. The diapycnal diffusivity there was estimated to be less than or approximately equal to 0.1 x 10(-4) meters squared per second. In contrast, mixing rates are large throughout the water column above the rough Mid-Atlantic Ridge, and the diffusivity deduced for the bottom-most 150 meters exceeds 5 x 10(-4) meters squared per second. Such patterns in vertical mixing imply that abyssal circulations have complex spatial structures that are linked to the underlying bathymetry. 相似文献
65.
66.
67.
68.
Powell CF 《Science (New York, N.Y.)》1960,132(3434):1134-1136
69.
Robert H. Gulden David Levy-Booth Jeff R. Powell Kari E. Dunfield K. Peter Pauls Clarence J. Swanton 《Soil biology & biochemistry》2007,39(8):1956-1967
Recent advances in molecular techniques have allowed for the routine examination of nucleic acids in environmental samples. Although current methodologies are very sensitive, accurate target DNA quantification from environmental samples remains challenging. To facilitate high-throughput DNA quantification from environmental samples, we developed a novel DNA quantification method based on a non-linear curve-fitting approach to extract additional information from quantitative PCR amplification curves and used the fitted parameters to develop multiple regression standard equations for target DNA quantification. A 3-parameter sigmoidal function performed superior to a 4-parameter Weibull function for generating the multiple regression standard equations. In a verification experiment, target DNA was quantified in a series of ‘unknown’ samples in three soils using this approach and the results were compared to target DNA values determined using corrected and uncorrected Ct-based (threshold cycle) methods. For each method, the deviations from the expected target DNA content were determined. Results clearly showed that over all DNA concentrations, target DNA content determined by the non-linear curve-fitting method was more accurate and more precise than values predicted by all other methods. Analysis of variance conducted on the predicted DNA contents also revealed fewer statistical artifacts with the non-linear curve fitting method compared to the conventional Ct-based methods. The novel approach described here is accurate, inexpensive, and very amenable for automation and high-throughput applications. 相似文献
70.
There is continuing concern over the health threat posed by theinhalation of ambient, transition-metal-containing particulatematter. Here, we report on the collection of two types ofanthropogenic, airborne particles, composed of iron with vanadiumand chromium (FeVCr) and iron with the rare earth metals ceriumand lanthanum (FeCeLa), respectively. Bi-weekly deposition platesamples were collected on indoor window sills of residentiallocations in inner-city Syracuse, NY. Sampling was continuous ateach location for two months during the spring of 1999. Themetal-bearing particles were identified, analyzed, and sizedin situ on each deposition plate using computer controlledscanning electron microscopy (CCSEM). Approximately 17% of thoseanalyzed by CCSEM fell into the inhalable size fraction. Particle loading varied between locations and changed over time.This was probably a function of various factors affectingparticle deposition rates. Notwithstanding, the plate loadingsfor the FeVCr-bearing particles tended to peak during the middleof the sampling period, suggesting that a single source/processwas operating to produce the FeVCr particles. The large sizeattained by some of these particles (greater than 50 μm inaggregates) suggest that long range transport was probably notinvolved. 相似文献