搜索结果: 1-15 共查到“理学 leaves”相关记录33条 . 查询时间(0.127 秒)
A cocktail of pesticides, parasites and hunger leaves bees down and out（图）
bee biodiversity ecosystem pollination intensified agriculture
2021/8/9
Pollinators are under threat. A meta-analysis reveals that the combination of agrochemicals, parasites and malnutrition has a cumulative negative effect on bees, and that pesticide–pesticide interacti...
Skin-ditching gecko inexplicably leaves body armor behind when threatened（图）
Skin-ditching gecko body armor threatened
2017/9/4
When trouble looms, the fish-scale geckos of Madagascar resort to what might seem like an extreme form of self-defense — tearing out of their own skin.
Their unusually large, overlapping scales flake...
Close Galactic Encounter Leaves "Nearly Naked" Supermassive Black Hole
Close Galactic Encounter Leaves Nearly Naked Supermassive Black Hole
2016/11/29
Astronomers using the super-sharp radio vision of the National Science Foundation's Very Long Baseline Array (VLBA) have found the shredded remains of a galaxy that passed through a larger galaxy, lea...
Effect of Sea Buckthorn Leaves on Inosine Monophosphate and Adenylosuccinatelyase Gene Expression in Broilers during Heat Stress
Sea Buckthorn Leaf, Heat Stress, Inosine Monophosphate, Adenylosuccinatelyase
2016/5/9
The trial was conducted to evaluate the effects of sea buckthorn leaves (SBL) on meat flavor in broilers during heat stress. A total 360 one-day-old Arbor Acre (AA) broilers (male) were randomly allot...
On the existence of stable compact leaves for transversely holomorphic foliations
Holomorphic foliation holonomy stable leaf
2012/4/17
A transversely holomorphic foliation on a compact complex manifold, exhibits a compact stable leaf if and only if the set of compact leaves is not a zero measure subset of the manifold.
Abstract: Let R be an o-minimal expansion of the real field. We introduce a class of Hausdorff limits, the T-infinity limits over R, that do not in general fall under the scope of Marker and Steinhorn...
Comparison of free lipid compositions between roots and leaves of plants in the Dajiuhu Peatland, central China
plant roots n-alkanes n-alkanols
2017/4/12
The main aim of this study was to assess the free lipid composition of plant community in a Chinese peatland. Twelve
plant species from the Dajiuhu Peatland were analyzed for the compositions of n-al...
Distribution and isotopic composition of n-alkanes from grass, reed and tree leaves along a latitudinal gradient in China
plant n-alkanes carbon isotopes hydrogen isotopes China
2017/4/12
Molecular composition and compound-specific carbon and hydrogen stable isotope ratios of n-alkanes are presented
for leaves of grass, reeds and trees from five regions extending between latitudes 22°...
Leaves and trajectories for schemes. Application to the comparison of three classical sheaves over the differential spectrum
Leaves trajectories schemes classical sheaves the differential spectrum
2010/11/15
We define leaves and trajectories for schemes endowed with a vector field. With the help of these tools, we are able to give a geometrical interpretation and to generalize several results and constru...
We prove the Poisson geometric version of the Local Reeb Stability (from foliation theory) and of the Slice Theorem (from equivariant geometry),which is also a generalization of Conn’s linearization t...
Ranking and unranking trees with a given number or a given set of leaves
Ranking unranking trees given number a given set of leaves
2010/12/3
In this paper, we provide algorithms to rank and unrank certain degree-restricted classes
of Cayley trees. Speci cally, we consider classes of trees that have a given set of leaves or that have a xe...
The filling law: a general framework for leaf shape diversity and its consequences on folded leaves
leaf shape diversity filling law folded leaves
2010/4/6
The leaves are packed in the buds, occupying the whole bud volume. They can do so being flat, enrolled, or folded, in different ways. This <lling law>>, underestimated before, has many consequences...
Optimization of Removal of Methylene Blue by Platanus Tree Leaves Using Response Surface Methodology
Methylene Blue Platanus Tree Leaves Response Surface Methodology
2010/9/17
Platanus tree leaves were successfully used as a novel sorbent for removing of methylene blue (MB) dye from aqueous solutions. A 23 full factorial design was performed for screening of the main factor...
Light Reflectance, Transmittance, and Utilization Efficiency of Leaves of Mikania micrantha and Interspecies Comparison within the Same Community
薇甘菊 草本植物 木本植物 光合能力 反射率 透射率
2009/11/18
该文对薇甘菊及其所在群落内19种植物(草本和木本)的叶片透射率、反射率和光合特征指标进行了测定, 结果表明:薇甘菊与其它植物透射和反射图谱的变化趋势都比较相近, 在各个光学特征指标与光合相关指标的相互关系中, 薇甘菊并没有表现出区别于同一群落内其它植物的特征。从平均值来看, 200-800 nm下叶片反射率和透射率由大到小依次为: 薇甘菊>草本植物>木本植物, 薇甘菊各光学植被指标(SR680、S...
Chemical constituents and mushroom tyrosinase inhibition activity of Chloroxylon swietenia leaves
Chloroxylon swietenia coumarins fatty alcohol flavonoid glycoside tyrosinase inhibition activity
2010/4/8
From the leaves of Chloroxylon swietenia DC., 5 known secondary metabolites, namely 6, 8-diprenylumbelliferone (1), bergaptan (2), isopimpinellin (3), tritriacontanol (4), and isoquercetrin (5), were ...