全文获取类型
收费全文 | 274篇 |
免费 | 11篇 |
国内免费 | 3篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 6篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 7篇 |
2015年 | 7篇 |
2014年 | 12篇 |
2013年 | 9篇 |
2012年 | 7篇 |
2011年 | 8篇 |
2010年 | 13篇 |
2009年 | 12篇 |
2008年 | 5篇 |
2007年 | 9篇 |
2006年 | 11篇 |
2005年 | 12篇 |
2004年 | 5篇 |
2003年 | 5篇 |
2001年 | 7篇 |
2000年 | 7篇 |
1999年 | 4篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 6篇 |
1995年 | 5篇 |
1994年 | 8篇 |
1993年 | 13篇 |
1992年 | 11篇 |
1991年 | 8篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1975年 | 5篇 |
1974年 | 5篇 |
1973年 | 2篇 |
1972年 | 3篇 |
1967年 | 1篇 |
排序方式: 共有288条查询结果,搜索用时 16 毫秒
1.
采用生态足迹距离指标方法体系,对2009年至2012年间北京市水果消费的生态足迹距离进行研究。结果表明4年间:跨区转移的生态承载力质量距离,由2009年的11.5×10~8t km逐年增加到了2012年的17.01×10~8t km,共增加了47.91%;生态足迹距离则相对稳定在886.66 km至1073.55 km之间;人均生态足迹距离,总体上由2009年的4.39×10~4km增加到2012年的5.55×104km,共增加了26.42%。从类别的视角,年均生态足迹距离最大的是香蕉(2072 km),最小的是苹果(476 km);年均跨区转移的生物承载力质量距离,最大的是西瓜(4978×10~8kg km),最小的是香蕉(518×10~8kg km);而4年平均人均生态足迹距离,最大的是西瓜(17.7×10~4km),最小的是香蕉(1.92×10~4km)。快速城市化阶段的北京,对外生态依赖范围也迅速扩大,并高于人口增加的速率。 相似文献
2.
3.
A. Joy Belsky 《Plant Ecology》1988,74(1):3-10
An index of vegetational heterogeneity in 16 grassland communities in the Serengeti National Park, Tanzania, was calculated using mean percent distance (MPD) among spatially separated quadrats. To determine whether regional factors such as annual precipitation, fire, soil sodicity, herbivore utilization, or percentage of species having clonal growth patterns influenced the amount of heterogeneity measured in individual grassland communities, the index was related to these factors by an interactively constructed multiple-regression model.Community heterogeneity varied in a curvilinear manner along a north-to-south transect; maximum values occurred in the center of the park with lower values near the northern and southern borders. Subsurface concentrations of Na+ and the presence or absence of mound-building termites were incorporated into the model, which explained 55% of the variability in grassland heterogeneity.Abbreviations PD=
Percentage Distance
- MPD=
Mean Percentage Distance 相似文献
4.
Atsushi Nakamoto Shinichi Itabe Akiko Sato Kazumitsu Kinjo Masako Izawa 《Population Ecology》2011,53(1):241-252
The study of mobile animals such as flying foxes in insular habitats involves clarifying the population status on each island
and determining the factors affecting movement patterns among the islands in their distributional range. We visited 25 of
the Okinawa Islands and documented the number of Orii’s flying foxes Pteropus dasymallus inopinatus from August 2005 to May 2006. We also conducted a monthly road census on the main island (Okinawa-jima Island) and six adjacent
islands from June 2006 to January 2007 and counted the number of fruit-bearing trees of the bats’ four main food plants. The
results of classification and regression tree analysis suggested that distance from the main island was a primary factor in
determining the distribution pattern and population size of this flying fox, whereas island area, number of plant species,
and food availability did not directly affect population size. The number of flying foxes on each island tended to decrease
with an increase in distance from the main island; no flying foxes existed on islands >30 km away from the main island. On
the other hand, the results of the monthly census showed that the population size on each island fluctuated seasonally. Individuals
may move between islands in response to seasonal changes in food availability. In conclusion, the distribution and abundance
of Orii’s flying foxes in the Okinawa Islands may be determined by the rate of immigration/emigration, depending on each island’s
distance from the main island. Seasonal changes in food availability may act as a trigger for interisland movement, but that
movement may be restricted by island connectivity. 相似文献
5.
We analyzed bilateral finger prints of 3158 individuals from 13 Iranian populations of diverse origins, for digital patterns,
using the topological method. Some male/female differences, and a great deal of heterogeneity in interpopulational variation
was observed. Distance analysis, and the resultant dendrograms separated the populations studied, but the separation was not
in agreement with the known ethnohistory of this region. Comparison of the obtained results with those based on the traditional
methodology showed that the traditional methodology gives better results in measuring population distances. 相似文献
6.
Shape variations in the dentition and the cranium were analyzed for sevenSaguinus forms of the hairy-face tamarin by applying the factor analysis method. The results obtained for the dental and cranial measurements
were almost consistent with each other.
The magnitude of the difference in shape factors between theS. nigricollis group and theS. midas group is appreciably larger than that between the former group and theS. mystax group. If the ancestral geographic centre of origin is postulated as being within the region which is inhabited by the livingS. nigricollis group, the morphological distances between any pairs of groups correlate well with the geographic distances between them.
Concerning the dental and cranial morphologies, the physical changes in the three species group probably took place in two
directions; that is, from theS. nigricollis group to theS. mystax group, and from theS. nigricollis group to theS. midas group.
The forms belonging to each species group are more closely related to each other, with the exception ofS. imperator in theS. mystax group. The uniqueness ofS. imperator was clearly demonstrated by factor analysis and distance analysis. In theS. mystax group, although still hypothetical,S. imperator may have been related only through the basic ancestral stock toS. labiatus andS. mystax. 相似文献
7.
The effect of isolation and history on colonization patterns of plant species in secondary woodland 总被引:10,自引:0,他引:10
Colonization success of woodland originating after 1850 was determined for seventeen forest plant species having different dispersal strategies. Colonization rate of the studied endo-and exozoochorous species apparently was considerable higher than that of species having short distance dispersal like myrmecochores and species lacking dispersal mechanisms. The occurrence of eight species in this young forest habitat was related to the distance to the nearest source patch (DNS), as well as to the age of the young patches and to their former land use. DNS calculated to old, existent and occupied source patches affected most analysed species. Only Ilex aquifolium L. had a significant higher occurrence in woodland originating before 1916 than in those originating after 1916. Former land use showed significant effects for three species. Although colonization rate and effects of studied parameters on occurrence were different for the studied species, no clear differences were found between different dispersal groups. The consequences of these results for the understanding of colonization processes of the species studied is discussed. 相似文献
8.
Gaetano Barbato Daniel O. Cicero Elisabetta Bianchi Antonello Pessi Renzo Bazzo 《Journal of biomolecular NMR》1996,8(1):36-48
Summary We describe the high-resolution structure by NMR of two peptides that belong to a combinatorial library based on the zinc-finger motif. The library represents, to the best of our knowledge, the first example of a conformationally homogeneous peptide library and was obtained by introducing random residues in five positions of the -helical portion of a 26-residue consensus peptide (CP1) belonging to the Cys2-Hys2 zinc-finger family. The result was shown to be a highly homogeneous -helical library (Bianchi et al., 1995). The structures of the parent compound (CP1) and of a representative member (CP1m) that was selected by screening the library with a monoclonal antibody are compared in detail as an example of the very high stability of the zinc-finger scaffold upon sequence variability. The two peptides exhibit an extremely high degree of structural similarity. The use of this type of conformationally constrained combinatorial library might represent a step forward in the design of peptidomimetics, as it considerably accelerates the process of the identification of the spatial relationship among the pharmacophoric groups.Abbreviations
t-Bu
tert-butyloxycarbonyl
- Fmoc
9-fluorenylmethoxycarbonyl 相似文献
9.
One hundred and fifty four (86 male and 68 female) Punjabi infants residing in Chandigarh (India) were longitudinally measured
for head circumference at monthly age intervals during first year of life. The general pattern of growth of head circumference
was characterised by initial sharp rise followed by slow gain during second half of infancy. Beyond birth male infants, possessed
higher and statistically significant mean values than their female counterparts. The pattern-wise similarity between growth
curves plotted for Punjabi and Western infants, may be attributed to protective effects of breast feeding. Head circumference
velocity showed rapid deceleration immediately after birth up to about 4 months, thereafter, it declined slowly. Sex differences
in monthly growth rates were found to be statistically significant (p<0.05) at a few of the age intervals during first year
of life. 相似文献
10.
In recent years, Chinese goral (Nemorhaedus griseus) carcasses were frequently found in the mid-Qinling Mountains. In order to assess the spatial distribution pattern of goral carcasses, data of the individuals from Shaanxi's Fourth Giant Panda Survey was used in this study to analyse how the gorals/goral carcasses sites were related to altitude, slope, aspect, river, and road through quantitative analyses. The results showed:(1) the correlation between the sites of goral carcasses and topographic factors was relatively significant. Goral carcasses tend to be found at relatively low altitude (1 200-2 400 m) and mild slope (6°-25°). The chi-square test also showed that the aspect of the goral carcasses sites was significantly different from the goral sites. Most of the goral carcasses were found at south-facing/half southfacing slopes. (2) The correlation between the sites of goral carcasses and the distance to river was significant. The kernel density analysis and Z-test further showed that there were significant differences between the gorals/goral carcasses sites and the distance to river. Most of the goral carcasses sites were close to river (< 100 m). (3) The correlation between the sites of goral carcasses and the distance to road was not significant. Kernel density analysis and Z-test showed that there was no significant difference between the sites of gorals/goral carcasses and the distance to road. This study proposed several suggestions about how to strengthen the protection of gorals in the future. 相似文献