نتایج جستجو برای: clumped
تعداد نتایج: 1053 فیلتر نتایج به سال:
Processes that spread through local contact, including outbreaks of infectious diseases, are inherently noisy, and are frequently observed to be far noisier than predicted by standard stochastic models that assume homogeneous mixing. One way to reproduce the observed levels of noise is to introduce significant individual-level heterogeneity with respect to infection processes, such that some in...
Methane cold seep systems typically exhibit extensive buildups of authigenic carbonate minerals, resulting from local increases in alkalinity driven by methane oxidation. Here, we demonstrate that modern seep authigenic carbonates exhibit anomalously low clumped isotope values (Δ47), as much as ∼0.2‰ lower than expected values. In modern seeps, this range of disequilibrium translates into appar...
One of the methods used to define biological resources is biological surveys. Results from biological surveys are often used to make comparisons between populations of organisms above and below discharges, or between reference sites and suspected impacted sites. One of the metrics from these biological surveys is count data that are based on replicate samples taken from sites or stations. These...
1. The aphids Uroleucon tissoti and U. nigrotuberculatum both exhibit significantly aggregated distribution patterns across clumps of their common host plant Solidago altissima, the tall goldenrod. However, U. nigrotuberculatum is significantly more aggregated than is U.tissoti. We tested the hypothesis that goldenrod genotype-by-U. tissoti genotype interactions for aphid performance characters...
Compound processes are proposed as models for the acquisition of hydatid cysts in sheep, caused by the parasite Echinococcus granulosus. The hypothesis of a clumped infection process against single ingestions is tested and it is shown that the clump-based approach provides a more accurate description of the two data sets investigated. Models with simple and mixed Poisson incidence processes and...
We have carefully reviewed the paper by De et al., reporting defective vials of NIST SRM 909a [1]. We thank the authors for initially alerting us to the problems they describe in some detail. While we do not disagree with their findings, we believe your readers should have additional information on SRM 909a. The Standard Reference Materials Program receives letters from SRM users from time to t...
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