Sentences with phrase «estimate of the abundance»

The more dark energy there is, the faster the expansion should be, so measuring the universe's expansion provides an estimate of the abundance of dark energy.

Finding that limit — the goal of the 62 - day T - Limit campaign, part of the International Ocean Discovery Program — could guide estimates of the abundance and diversity of ocean floor microbes, which play large roles in biogeochemical cycles.

Not exact matches

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The software reliably distinguishes dropout genes from those that aren't expressed at all, and it provides accurate estimates of the actual abundances.

By measuring the relative abundance of various elements in debris left over from nuclear explosions, researchers say they can accurately estimate the amount of energy released during the initial blast.

This abundance is lower than model estimates of ultraviolet (UV) degradation of accreted interplanetary dust particles (IDP's) or carbonaceous chondrite material.

Based on the abundance of these cyanobacteria and the rate at which they gobble down radioactive nitrogen in the laboratory, the researchers estimate they account for about 10 % of nitrogen fixation in the ocean.

The lesser prairie - chicken has experienced widespread declines in abundance and distribution, with some estimates suggesting greater than a 90 percent decrease of the population.

Several years ago Loeb and two colleagues performed a speculative calculation estimating the interstellar abundance of «Oumuamua - sized space rocks based on the density of stars in the Milky Way and the vagaries of planet formation.

In addition, they estimate the impact of other sources of error on the mRNA and protein abundance measurements using direct experimental data, and they find that, when error is explicitly measured and modeled, an even greater correlation between mRNA and protein is expected.

Using this method to estimate the abundance and distribution of fish species could help scientists more easily understand the impact certain environmental factors, such as oyster farms or pollution, are having on local fish populations.

Despite the global abundance of water and the mainly renewable character of this resource, it is estimated that one - fifth of the world's population lives under conditions of water scarcity (1).

A similar model, allied with a bootstrapping exercise to quantify sampling error, was used to generate estimated Amazon - wide abundances of the 4962 valid species in the data set.

The test of how well these instruments can detect different species of marine mammals, and over what distances, is just the first step towards using acoustic data collected by gliders and floats to estimate marine mammal density and abundance.

It will also estimate the abundance, in tons, of the large taxonomic groups like the crustaceans.

Measurements of surface chemical composition, either by direct sampling (as has been done on Earth, the moon, and Mars) or through spectroscopic observations, can be used to estimate elemental abundances and the degree of chemical differentiation that occurred as the planets condensed from the solar nebula.

To get a better estimate of their overall abundance, we looked at what we call catch rates — how many were caught per vessel per unit of time — over the past six decades.

But in most cases, abundance estimates have uncertainties of at least 20 percent, says mathematician Doug Butterworth of the University of Cape Town in South Africa and a member of the IWC scientific committee.

«Estimating the abundance and characteristic properties of sources at early times is particularly important in understanding how the universe reionized itself, thus ending the Dark Ages,» remarks study co-author Mike Santos of the Institute of Astronomy in Cambridge, England.

University of Montana forest ecology Professor Andrew Larson recently published research estimating the abundance of morel mushrooms after a wildfire in California's Sierra Nevada.

I estimate that this process would have been capable of explaining Titan's observed methane abundance.

«The development of metagenomic sequencing of the total DNA in a microbial sample from the human body has allowed us to estimate the abundance of specific microbes and microbial genes.

We show that this statistical framework correctly estimates the abundance of false positives already identified around Kepler targets with multiple sets of transit - like signatures based on their abundance around targets with single sets of transit - like signatures.

Posterior probability distributions for the difference in DNA abundance between air swab negative controls and placenta (blue), saliva (red), vaginal swabs (orange), and other negative controls (green) as estimated by quantitative PCR analysis of 16S rRNA gene abundance for PSP (top) and MO BIO extractions (bottom).

For each star, we present estimates and uncertainties of mass, age, radius, luminosity, core hydrogen abundance, surface helium abundance, surface gravity, initial helium abundance, and initial metallicity as well as estimates of their evolutionary model parameters of mixing length, overshooting coefficient, and diffusion multiplication factor.

The APOGEE red - clump (APOGEE - RC) catalog contains photometry from 2MASS, reddening estimates, distances, line - of - sight velocities, stellar parameters and elemental abundances determined from the high - resolution APOGEE spectra, and matches to major proper motion catalogs.

Using data from NASA's Kepler mission we show that using the solar - calibrated \ alpha is not always appropriate, and that in many cases it would lead to estimates of initial helium abundances that are lower than the primordial helium abundance.

Unfortunately these studies used a different strain of mouse and / or the gene - level expression data is not publically available, thus we were unable to compare those abundance estimates with the data reported here.

Typically, astronomers rely on extremely indirect and imprecise techniques for estimating oxygen abundance for the vast majority of distant galaxies.

Our work, apart from providing the first estimates of vital rates and other population characteristics of the endangered snow leopard, reiterates the value of long - term monitoring of both abundance and population dynamics for conservation planning and action.

Jackknife estimation of abundance using the heterogeneity models [25] showed that the estimated mean adult population ranged from 12 (95 % CI = 11 — 19) to 14 (95 % CI = 14 — 21) during the four years (Table 1).

We were able to detect expression above threshold for only 39.8 % of the 1107 OR genes present in the microarray and for 57.4 % of the 197 VR genes represented in the array, consequently there are only moderate correlations between microarray and RNAseq receptor abundance estimates.

We used robust design multi-season mark - recapture analysis to estimate the trends in abundance, sex ratio, survival probability and the probability of temporary emigration and immigration for adult and young snow leopards.

Sensitive to estimate's of the star's abundance of «metals» (elements heavier than hydrogen), Star A appears to have 1.6 to 1.7 times Sol's mass (van Belle et al, 2007; Guenther et al, 2005; D.B. Guenther, 2004; and Carrier et al, 2004), about 2.7 times Sol's diameter (van Belle et al, 2007; Fracassini et al, 1994; and Johnson and Wright, 1983, page 679), and around 8.9 times Sol's bolometric luminosity (van Belle et al, 2007; and Thévenin et al, 2005).

We examine the trends in population abundance and sex ratio, and estimate the detectability, survival probability and probabilities of temporary emigration and immigration for adult and young snow leopards.

However, our receptor gene data is only moderately similar to nanoCAGE (Spearman correlation = 0.38; Figure 6B) and the abundance estimates of the OR and VR genes represented on the Illumina microarrays (Spearman correlation = 0.54 for OR and 0.29 for VR genes; Figure S6).

Here, we review the use of eDNA metabarcoding for surveying animal and plant richness, and the challenges in using eDNA approaches to estimate relative abundance.

We compared estimates of relative abundance obtained via capture — mark — recapture and minimum numbers known to be alive, and estimates of activity obtained using probability of detection and general index methods, pre - and post-culling.

The abundance of unowned free - roaming cats in the United States is estimated in the tens of millions [2].

Using rejection - based Approximate Bayesian Computation, we estimate the size of the population bottleneck at its minimum abundance and the pre-bottleneck abundance.

Of particular interest is the possibility of a large population decline prior to whaling, as such a decline could explain the ∼ 5-fold difference between genetic estimates of prior abundance and estimates based on historical recordOf particular interest is the possibility of a large population decline prior to whaling, as such a decline could explain the ∼ 5-fold difference between genetic estimates of prior abundance and estimates based on historical recordof a large population decline prior to whaling, as such a decline could explain the ∼ 5-fold difference between genetic estimates of prior abundance and estimates based on historical recordof prior abundance and estimates based on historical records.

The BRUV project is part of a collection of researchers from Florida International University (FIU) to estimate and compare the relative abundance of predator fish species, including sharks and rays, inside and outside marine protected areas (MPA's).

«The Antarctic blue whale (Balaenoptera musculus intermedia) was hunted to near extinction between 1904 and 1972, declining from an estimated initial abundance of more than 250,000 to fewer than 400.»

To get a sense of the mix of whaling - era data, tracking and modeling used to estimate past blue whale abundance, read this PloS ONE paper by an overlapping research team from last year: «Estimating Historical Eastern North Pacific Blue Whale Catches Using Spatial Calling Patterns.»

For example, how good is the estimate of carbon abundance to 3 meters depth?

It is estimated that the moon has an abundance of helium - 3 in the region of 1million tonnes.

This is what the ESRL had to say about satellite - based COs sensing and I quote «Greenhouse gas abundances derived from optical absorption measurements from space can never be calibrated because one can not control the abundance of the gases being estimated, nor can we control potential interfering factors in the optical path.»

It is important to realize that this range never has been an estimate of total abundance in a scientific sense, but simply a qualified guess given to satisfy public demand.

Estimating the abundance of animals that spend most of their time below the surface is difficult.

The Scientific Committee has developed guidelines on how to best estimate abundance of whales from ships and aeroplanes for use in the RMP.