نتایج جستجو برای: expected species estimation

تعداد نتایج: 1030040  

Today, invasive species are considered as one of the major threats to biodiversity and ecosystem functions. The suitable habitats of these species are expected to be expanded under the effects of future climate change hence it is likely to threaten the existence of native species. Consequently, identifying the current and potential distribution range of invasive species is essential for managem...

Journal: :تحقیقات مالی 0
محمداسماعیل فدائی نژاد رضا عیوض لو

capital asset pricing, as one of the basic theories in finance and investment area, develop a model for estimation of expected rate of return and equity cost of capital. this model has many applications in the field of finance. one of anomalies in the capital asset pricing model is the value premium that its proponents believe this risk premium is compensation for a risk not mentioned in origin...

2010
Lars Hendrich Joan Pons Ignacio Ribera Michael Balke

BACKGROUND The demand for scientific biodiversity data is increasing, but taxonomic expertise is often limited or not available. DNA sequencing is a potential remedy to overcome this taxonomic impediment. Mitochondrial DNA is most commonly used, e.g., for species identification ("DNA barcoding"). Here, we present the first study in arthropods based on a near-complete species sampling of a famil...

2000
Jyrki Jalonen Ilkka Vanha-Majamaa Tiina Tonteri

Field and ground layer vegetation in a mature Norway spruce (Picea abies L.) forest of Myrtillus-type in Kuorevesi, southern Finland, was sampled on 31 plots of sizes 0.5, 1 and 2 m to find optimal balance among sampling effort, number of observed species, and accuracy of mean species-cover estimates. Rarefaction and bootstrapping were used in the data analysis. According to the results, the ad...

Journal: :iranian journal of public health 0
reza ranjbar molecular biology research center, baqiyatallah university of medical sciences, tehran, iran. davoud afshar dept. of pathobiology, school of public health, tehran university of medical sciences, tehran, iran. ali mehrabi tavana health management research center, baqiyatallah university of medical sciences, tehran, iran. ali najafi molecular biology research center, baqiyatallah university of medical sciences, tehran, iran. fatemeh pourali molecular biology research center, baqiyatallah university of medical sciences, tehran, iran. zahra safiri molecular biology research center, baqiyatallah university of medical sciences, tehran, iran.

shigella species are among the common causes of bacterial diarrhoeal diseases. traditional detection methods are time-consuming resulting in delay in treatment and control of shigella infections thus there is a need to develop molecular methods for rapid and simultaneous detection of shigella spp. in this study a rapid multiplex pcr were developed for simultaneous detection of three pathogenic ...

Conservation of vegetation is one of most important tools for conservation of soil and decreasing erosion. Therefore, knowledge about vegetation characteristics, such as diversity, is the first and most important biological tools for soil conservation. One of the methods in which we can collect useful data about plant diversity, is additive partitioning. In the current study, plant species dive...

Journal: :Proceedings of the National Academy of Sciences 2015

Journal: :Systematic biology 2012
Noah Reid John R Demboski Jack Sullivan

The causes and consequences of rapid radiations are major unresolved issues in evolutionary biology. This is in part because phylogeny estimation is confounded by processes such as stochastic lineage sorting and hybridization. Because these processes are expected to be heterogeneous across the genome, comparison among marker classes may provide a means of disentangling these elements. Here we u...

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