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Abundant central extensions of non-trivial genera

K. Miyake, N. Ormerod
1984 Nagoya mathematical journal  
Letkbe either a local or a global field, andKbe a finite Galois extension ofkwith g = Gal (K/k). Let L be a Galois extension ofKwhich is also Galois overk.  ...  Such an extension is called central if Gal(L/iT) lies inside the centre of Gal(L/K). ClearlyLis abelian overK.  ...  Such extensions are called abundant central extensions of K/k.  ... 
doi:10.1017/s002776300002095x fatcat:lp46565ejzhpxmxuqfla2uggfe

An Extension of the Abundancy Index to Certain Quadratic Rings [article]

Colin Defant
2015 arXiv   pre-print
We begin by introducing an extension of the traditional abundancy index to imaginary quadratic rings with unique factorization.  ...  After showing that many of the properties of the traditional abundancy index continue to hold in our extended form, we investigate what we call n-powerfully solitary numbers in these rings.  ...  The Extension of the Abundancy Index For a nonzero complex number z, let arg(z) denote the argument, or angle, of z. We convene to write arg(z) ∈ [0, 2π) for all z ∈ C.  ... 
arXiv:1506.05416v1 fatcat:xcnkzchhjfe2rk52kavgirra74

An extensive comparison of species-abundance distribution models [article]

Elita Baldridge, David J. Harris, Xiao Xiao, Ethan P. White
2015 bioRxiv   pre-print
A number of different models have been proposed as descriptions of the species-abundance distribution (SAD).  ...  First, since the majority of species abundance 5 .  ...  Introduction 21 The species abundance distribution (SAD) describes the full distribution of commonness and rarity 22 in ecological systems.  ... 
doi:10.1101/024802 fatcat:ibscq7zqefdxbd3rrxcgzmgzdm

An extensive comparison of species-abundance distribution models

Elita Baldridge, David J. Harris, Xiao Xiao, Ethan P. White
2016 PeerJ  
A number of different models have been proposed as descriptions of the species-abundance distribution (SAD).  ...  Discussion Our extensive comparison of different models for the species abundance distribution (SAD) using rigorous statistical methods demonstrates that most existing models provide equivalently good  ...  Table 1 : .1 Details of datasets used to evaluate the form of the species-abundance distribution.  ... 
doi:10.7717/peerj.2823 pmid:28028483 pmcid:PMC5183127 fatcat:n7cqe4bnjnesldt5awlns7by6q

Foamy-like endogenous retroviruses are extensive and abundant in teleosts

Ryan Ruboyianes, Michael Worobey
2016 Virus Evolution  
Its active site consists of a single arginine, an abundant residue in fish EFVs.  ... 
doi:10.1093/ve/vew032 pmid:28058112 pmcid:PMC5210030 fatcat:e2wse73igjbuxhpeueqloh2aiy

An efficient extension of N-mixture models for multi-species abundance estimation [article]

Juan Pablo Gomez, Scott K. Robinson, Jason K. Blackburn, Jose Miguel Ponciano
2016 bioRxiv   pre-print
In this study we propose an extension of the N-mixture family of models that targets an improvement of the statistical properties of rare species abundance estimators when sample sizes are low, yet typical  ...  We illustrate how our methodology can be used to suggest sample sizes required to estimate the abundance of organisms, when these are either rare, common or abundant.  ...  In the following section, after summarizing the widely used N-mixture models, we 113 develop a multi-species model extension that allows a more accurate estimation of the 114 abundance of rare species  ... 
doi:10.1101/073577 fatcat:jzigeq4o65gulkpizbogsosp2y

Extension of the gambin model to multimodal species abundance distributions

Thomas J. Matthews, Michael K. Borregaard, Colin S. Gillespie, François Rigal, Karl I. Ugland, Rodrigo Ferreira Krüger, Roberta Marques, Jon P. Sadler, Paulo A. V. Borges, Yasuhiro Kubota, Robert J. Whittaker, Timothée Poisot
2018 Methods in Ecology and Evolution  
In this study, we present an extension of the gambin SAD model to multimodal SADs. 2.  ...  Species abundance distributions (SADs) are one of the most widely used tools in macroecology, and it has become increasingly apparent that many empirical SADs can best be described as multimodal.  ...  We set out to provide a multimodal extension of gambin because the gambin model is relatively simple and it would allow comparison of the fit of unimodal and multimodal models analytically using standard  ... 
doi:10.1111/2041-210x.13122 fatcat:7jwvatkloravllg2qqxooqwxsq

Relative abundance and range extensions of bird species in central Labrador

Marcel A. Gahbauer, Karen Rashleigh
2022 Canadian field-naturalist  
Relative bird abundance was highest in hardwood and mixedwood forests and lowest in areas dominated by Black Spruce (Picea mariana).  ...  The most abundant of these were Least Flycatcher (Empidonax minimus), Cedar Waxwing (Bombycilla cedrorum), and Magnolia Warbler (Setophaga magnolia), each with more than 80 observations over multiple years  ...  Acknowledgements We thank Nalcor for supporting the extensive field survey program and the publication of this manuscript.  ... 
doi:10.22621/cfn.v135i3.2419 fatcat:3howznhcc5dybm7snjqbcihuwi

Transcriptome analysis of developing lens reveals abundance of novel transcripts and extensive splicing alterations

Rajneesh Srivastava, Gungor Budak, Soma Dash, Salil A. Lachke, Sarath Chandra Janga
2017 Scientific Reports  
Examination of splice isoforms revealed skipped exon and retained intron to be the most abundant alternative splicing events during lens development.  ...  Additionally, we investigated the alternative splicing events using rMATS 27 followed by an extensive functional analysis of the genes associated with enriched splicing event types.  ...  As Biodalliance requires BED (Browser Extensible Data) or BigBed formatted input files, we preprocessed these tables into BED formatted text files and generated the corresponding BigBed files, which are  ... 
doi:10.1038/s41598-017-10615-4 pmid:28912564 pmcid:PMC5599659 fatcat:ta7dkdwfevd65dgdglhu3emvbe

An efficient extension of N-mixture models for multi-species abundance estimation

Juan P. Gomez, Scott K. Robinson, Jason K. Blackburn, José M. Ponciano, David Murrell
2017 Methods in Ecology and Evolution  
We illustrate how our methodology can be used to suggest sample sizes 23 required to estimate the abundance of organisms, when these are either rare, 24 common or abundant.  ...  We provide guidance to deter-6 mine the sample size required to estimate accurately the abundance of rare 7 tropical species when attempting to estimate the abundance of single species. 8 1 peer-reviewed  ...  In the following section, after summarizing the widely used N-mixture models, we 113 develop a multi-species model extension that allows a more accurate estimation of the 114 abundance of rare species  ... 
doi:10.1111/2041-210x.12856 pmid:29892335 fatcat:ouf4wzbmqbcvloh7u7a5x27wla

Quantifying changes in abundance without counting animals: extensions to a method of fitting integrated population models

Stephen N. Freeman, Panagiotis Besbeas
2011 Journal of Ornithology  
.; Besbeas, Panagiotis. 2012 Quantifying changes in abundance without counting animals: extensions to a method of fitting integrated population models. Journal of Ornithology, 152 (suppl. 2).  ...  Alternatively, an index of relative abundance is derived as t y t e Y ∝ .  ...  Once the latter are calculated, reconstruction of the estimated trend in abundance is also straightforward.  ... 
doi:10.1007/s10336-011-0667-4 fatcat:xjob4ewrxfemvpytwo2ohoenxa

Application of hierarchical oligonucleotide primer extension (HOPE) to assess relative abundances of ammonia- and nitrite-oxidizing bacteria

Giantommaso Scarascia, Hong Cheng, Moustapha Harb, Pei-Ying Hong
2017 BMC Microbiology  
Hierarchical oligonucleotide primer extension (HOPE), previously developed to rapidly quantify relative abundances of specific microbial groups of interest, was applied in this study to track the abundances  ...  In contrast, Nitrosospira remained stable in its relative abundance against the total community throughout the operational phases.  ...  The HOPE thermal cycling program consisted of 20 cycles of denaturation (96°C for 10 s), annealing (60°C for 30 s) and extension (72°C for 15 s).  ... 
doi:10.1186/s12866-017-0998-2 pmid:28376730 pmcid:PMC5381152 fatcat:vuehixwx2bhrho6nckm4e3a53i

Distribution and abundance of cultured scallop Patinopecten yessoensis in extensive sea beds as assessed by underwater camera

S Goshima, H Fujiwara
1994 Marine Ecology Progress Series  
The study was done in a subtidal fishery ground in Tokoro, Hokkaido, Japan (44" 13' N, 143" 55' E) where extensive culture of scallops on the sea bed is carried out.  ...  Abundant food supply keeps the scallop beds at a higher density, although feeding and growth inhibitions at very high rates of flow have also been reported (Wildish et al. 1987) .  ... 
doi:10.3354/meps110151 fatcat:gbvaq4tvjzfznca7yxijc6ia4u

Relative Abundance of Bacteroides spp. in Stools and Wastewaters as Determined by Hierarchical Oligonucleotide Primer Extension

P.-Y. Hong, J.-H. Wu, W.-T. Liu
2008 Applied and Environmental Microbiology  
A molecular method, termed hierarchical oligonucleotide primer extension (HOPE), was used to determine the relative abundances of predominant Bacteroides spp. present in fecal microbiota and wastewaters  ...  Furthermore, Bac303-related targets (i.e., most Bacteroidales) were observed to account for 28 to 44% of PCR-amplified 16S rRNA genes from human fecal microbiota, and their abundances were higher than  ...  Thus, amplicons that under- Specificity of primer extension. The specificities of primer extension were validated against reference strains.  ... 
doi:10.1128/aem.02568-07 pmid:18344347 pmcid:PMC2394900 fatcat:bsblw6lc4vhebj4ak7nwjprp5i

Microdiversity of an Abundant Terrestrial Bacterium Encompasses Extensive Variation in Ecologically Relevant Traits

Alexander B. Chase, Ulas Karaoz, Eoin L. Brodie, Zulema Gomez-Lunar, Adam C. Martiny, Jennifer B. H. Martiny, Jizhong Zhou
2017 mBio  
to its high abundance in grassland leaf litter.  ...  We focused on the most abundant bacterium, Curtobacterium , which by standard methods is grouped into only one OTU.  ...  As in aquatic and host-associated ecosystems (6, 8, 14, (29) (30) (31) , microdiversity within this abundant bacterium is extensive.  ... 
doi:10.1128/mbio.01809-17 pmid:29138307 pmcid:PMC5686540 fatcat:lkpv7sd4wzbprgv6fdul37oquu
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