全文获取类型
收费全文 | 44篇 |
免费 | 9篇 |
专业分类
53篇 |
出版年
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2011年 | 2篇 |
2010年 | 2篇 |
2008年 | 1篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2003年 | 1篇 |
2001年 | 3篇 |
1999年 | 1篇 |
1991年 | 1篇 |
1974年 | 1篇 |
1964年 | 1篇 |
1963年 | 2篇 |
1962年 | 2篇 |
1961年 | 2篇 |
1960年 | 1篇 |
1958年 | 1篇 |
1945年 | 1篇 |
1944年 | 1篇 |
1943年 | 1篇 |
1942年 | 3篇 |
1940年 | 2篇 |
1936年 | 3篇 |
1934年 | 1篇 |
1933年 | 1篇 |
1932年 | 1篇 |
1931年 | 2篇 |
排序方式: 共有53条查询结果,搜索用时 0 毫秒
1.
2.
Andriambeloson Jean-Basile Blanco Marina B. Andriantsalohimisantatra Ando Rivoharison Tahiry V. Walker Nathan Birkinshaw Chris Yoder Anne D. 《Primates; journal of primatology》2021,62(6):887-896
Primates - Habitat fragmentation is one of the major types of anthropogenic change, though fragmented landscapes predate human intervention. At present, the Central Highlands of Madagascar are... 相似文献
3.
K. L. M. Freeman A. Bollen F. J. F. Solofoniaina H. Andriamiarinoro I. Porton C. R. Birkinshaw 《Plant biosystems》2013,147(3):570-580
Using the example of Madagascar Fauna and Flora Group (MFG), we look at the factors which contribute to the successful maintenance of an international consortium dedicated to the conservation of Malagasy biodiversity. We discuss the philosophy, mission and set-up of the MFG and how, over its 25-year history, it has enabled the productive collaboration of its diverse international members to achieve the common goal of helping to protect Madagascar's unique biodiversity. We explore the benefits of pooling resources to fund a stable base of personnel and infrastructure to maximise the conservation impact of contributions from organisations that might not otherwise be able to fund viable independent programmes and consider the benefits that accrue to partners in the consortium. We highlight specific examples of plant conservation projects set up as a result of the productive working relationship between MFG and Missouri Botanical Garden to reinforce the argument that like-minded organisations working in successful partnership can far exceed the conservation capacity of individual institutions. 相似文献
4.
Prostephanus truncatus is an economically important beetle pest of stored maize and cassava in the tropics. Male beetles signal using an aggregation pheromone that attracts both female and male beetles over large distances. Females preferentially orientate towards the pheromone signals of particular males when given a choice. The influence of pheromone signalling on courtship and mating success was investigated using pheromone biossays and mating trials in both of which a female made a choice between two males. Signalling was manipulated by exposing males to a Female Factor that inhibits pheromone production. The relative attractiveness of males to females based on pheromone bioassays was found not to influence short-range courtship behaviour or mating success. 相似文献
5.
Yumin Dai Liva Harinantenaina Peggy J. Brodie Chris Birkinshaw Richard Randrianaivo Wendy Applequist Michel Ratsimbason Vincent E. Rasamison Yongchun Shen Karen TenDyke David G. I. Kingston 《化学与生物多样性》2013,10(2):233-240
Investigation of the endemic Madagascan plant Nematostylis anthophylla (Rubiaceae) for antiproliferative activity against the A2780 ovarian cancer cell line led to the isolation of the known triterpene saponin randianin ( 1 ), and the two new bioactive triterpene saponins 2″‐O‐acetylrandianin ( 2 ) and 6″‐O‐acetylrandianin ( 3 ). The structures of the two new compounds were elucidated based on analysis of their 1D‐ and 2D‐NMR spectra, and mass spectrometric data. The three isolated triterpene saponins displayed moderate but selective antiproliferative activities, with IC50 values of 1.2, 1.7, and 2.2 μM , respectively, against the A2780 ovarian cancer, but only weak inhibitions of the proliferation of A2058 melanoma and the H522 lung cancer cell lines. 相似文献
6.
Yixi Liu Liva Harinantenaina Peggy J. Brodie Jessica D. Bowman Maria B. Cassera Carla Slebodnick Martin W. Callmander Richard Randrianaivo Etienne Rakotobe Vincent E. Rasamison Wendy Applequist Chris Birkinshaw Gwilym P. Lewis David G.I. Kingston 《Bioorganic & medicinal chemistry》2013,21(24):7591-7594
Bioassay-directed fractionation of the leaf and root extracts of the antiproliferative Madagascar plant Stuhlmannia moavi afforded 6-acetyl-5,8-dihydroxy-2-methoxy-7-methyl-1,4-naphthoquinone (stuhlmoavin, 1) as the most active compound, with an IC50 value of 8.1 μM against the A2780 human ovarian cancer cell line, as well as the known homoisoflavonoid bonducellin (2) and the stilbenoids 3,4,5′-trihydroxy-3′-methoxy-trans-stilbene (3), piceatannol (4), resveratrol (5), rhapontigenin (6), and isorhapontigenin (7). The structure elucidation of all compounds was based on NMR and mass spectroscopic data, and the structure of 1 was confirmed by a single crystal X-ray analysis. Compounds 2?5 showed weak A2780 activities, with IC50 values of 10.6, 54.0, 41.0, and 74.0 μM, respectively. Compounds 1?3 also showed weak antimalarial activity against Plasmodium falciparum with IC50 values of 23, 26, and 27 μM, respectively. 相似文献
7.
8.
Studies in the biochemistry of micro-organisms. 114. Viridicatol and cyclopenol, metabolites of Penicillium viridicatum Westling and Penicillium cyclopium Westling 总被引:1,自引:1,他引:0 下载免费PDF全文
J. H. Birkinshaw M. Luckner Y. S. Mohammed K. Mothes C. E. Stickings 《The Biochemical journal》1963,89(2):196-202
9.
10.
Abstract 1 Attack by Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) on the maize and cassava stored by small‐holder farmers in Africa is sporadic, varying considerably within and between years. The risk that food in store will become infested is related to the number of beetles dispersing by flight. A means of predicting years with high dispersal rates is needed to warn farmers when to be vigilant. 2 The relationship between climatic variables and pheromone trap catches was observed in a forest‐savannah transition zone in Ghana. These observations were used to devise a model using a mix of biological and empirical rules that operate on temperature and humidity data. The predicted and actual trap catch deviated by only +5% to ?1% in years when there were high dispersal rates. 3 The first part of the model estimates the numbers of beetles with potential for dispersal. The second part predicts the proportion likely to disperse. This is based on the apparent effect that those P. truncatus developing under low temperature conditions (about 24 °C) have a lowered propensity for flight, a response previously observed in a related species. 4 The model was validated using climate data and trap catches from a woodland–savannah zone and a short grass steppe zone. With minor adjustment, the model worked well for these two habitats. 相似文献