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20 de marzo de 2010

Marzo 29 en PhyloSeminar: Probabilistic analysis of gene families with respect with gene duplication, gene loss, and lateral gene transfer


On March 29th, phyloseminar.org will present Jens Lagergren speaking
on "Probabilistic analysis of gene families with respect with gene
duplication, gene loss, and lateral gene transfer."
NOTE: the seminar will begin at 10h PST, which is three hours earlier
than the previous seminars.

ABSTRACT
Incongruences between gene trees and corresponding species trees are
common. Gene duplication, gene loss, and lateral gene transfer are
three types of evolutionary events that can cause such incongruences.
I will first describe a probabilistic process that contains standard
models of nucleotide substitutions (i.e., such that underly
probabilistic methods for phylogenetic tree reconstruction) as well as
gene duplication and gene loss. This process takes place in a given
species tree and can be used to reconstruct a gene tree for a gene
family of interest and simultaneously reconcile the gene tree with the
species tree. I will describe the algorithms available for this model
and also describe how they perform on biological data compared to
competing methods. Finally, I will describe an extension of this model
that also contains lateral gene transfer and show how it performs on
synthetic data.


Hope to see you there!

Erick Matsen

9 de marzo de 2010

Internship opportunity at the NHM, London

Taxonomy Trainee Scheme: Natural History Museum
As a response to the widely perceived decline in taxonomic and curatorial expertise, the Natural History Museum, London invites expressions of interest for taxonomy trainees. The aim is to enthuse and help train a number of people with a demonstrable interest in taxonomy and museum collections, by giving them an opportunity to learn taxonomic and curatorial skills under guidance from experienced staff in the environment of the Natural History Museum’s world famous specimen collections.
The traineeship will equip you with a range of basic taxonomic and curatorial skills and are suitable for individuals seeking further development in this discipline and who wish to experience this type of work.
This project is intended to be rolled out as a fee paying traineeship, but for the first year, as a trial, a small number of short-term (three month) traineeships will have the fee waived, and instead the Museum will provide daily allowances toward accommodation, subsistence and travel.
Traineeships will be available in the Departments of Botany, Entomology and Zoology. Dates of traineeships are negotiable with supervisors, but must take place between March and October 2010.
Successful applicants will have:
  • a good general education to A-level or equivalent
  • a demonstrable enthusiasm for natural history
  • previous experience, however small, of handling animal or plant specimens
  • attention to detail
  • the ability to work with others
  • the ability to work to deadlines
  • a willingness to take on tasks with a positive attitude
  • familiarity with standard computer software e.g. Word, Excel.
If you wish to apply, please send a letter outlining you interests, qualities and reasons for applying to the following address not later than 15th March 2010. Please state which department you have a preference for (you may apply to all of them but please make clear how your interests fit with each department).
Shazima Tejani
Taxonomy Traineeship Scheme
The Natural History Museum
Cromwell Road
London SW7 9BD
Email: s.tejani@nhm.ac.uk
The successful candidates will be involved in one of the following projects:
Taxonomy Traineeship Scheme:
1. Botany. Identification of type specimens in the Liverwort Herbarium This project involves tracing which specimens represent type material. It is very strongly taxonomy oriented and provides an opportunity to work in an internationally important botanical collection, learning the core skills of curation as well as specimen-based research.
2. Open Air Laboratory (OPAL) surveys. This is an opportunity to take part in a citizen science project. Some field work is involved and there may be limited week-end work.
3. Taxonomic and curatorial work in the Natural History Museum’s beetle collections. Beetles are the most diverse group of organisms on the planet, and the Natural History Museum’s collections are probably the most comprehensive in the world. The successful applicant will spend three months working on designated taxonomy and curatorial projects in the collections, learning essential skills from the Museum’s renowned team of coleopterists.
4. Taxonomic and curatorial work in the Natural History Museum’s Zoology Department. The Zoology Department's collections comprise 30 million specimens, 22 million of which are in spirit. The successful candidate will experience the diverse challenges of identifying and curating specimens from one, or several, zoological groups possibly including, but not necessarily limited to, fish, birds and lower invertebrates. Please state your preferences in your application.

2 de marzo de 2010

Sitio web del XVIII Congreso Mexicano de Botánica


El Comité Organizador del XVIII Congreso Mexicano de Botánica invita a participar en este evento científico que se llevará a cabo del 21 al 27 de noviembre de 2010 en Guadalajara, Jalisco. Las actividades incluyen:

  • Conferencias magistrales
  • Simposios
  • Exposición de carteles
  • Mesas redondas
  • Reuniones satélite
  • Cursos y talleres
  • Certamen de tesis
  • Excursiones
  • Exposiciones


--
El sitio web del congreso esta en:
http://www.cucba.udg.mx/congreso_botanica/

1 de marzo de 2010

Assistant/Associate Professor in Insect Systematics and Taxonomy

Assistant/Associate Professor in Insect Systematics and Taxonomy | Society of Systematic Biologists

The Department of Entomology, Faculty of Agricultural and Food Sciences, University of Manitoba invites applications for a tenure track position at the rank of Assistant or Associate Professor, commencing July 1, 2010, or as soon as possible thereafter, to teach and conduct research in Insect Systematics and Taxonomy. The position will be weighted at approximately 45% teaching, 40% research and 15% service/outreach. Qualified applicants must possess: a Ph.D. in taxonomy and systematics of insects or closely related arthropods; a record of independent research as demonstrated by scholarly publications; the potential for developing a strong externally funded research program in one or more areas of insect systematics or taxonomy; demonstrated ability or potential for excellence in undergraduate and graduate teaching; and excellent oral and written communication skills.

For more information on this opportunity, please visit:
http://umanitoba.ca/cgi-bin/human_resources/jobs/view.pl?posting_id=83819

24 de febrero de 2010

Hoy en PhyloSeminar: Consistency properties of species tree inference algorithms under the multispecies coalescent

Noah Rosenberg
February 24th, 13h PST
http://phyloseminar.org/
Noah Rosenberg speaks Feb. 24th
Abstract:
The topologies of gene trees that evolve along the branches of a
species tree need not match the species tree topology. As a result of
this discordance, when gene tree evolution is assumed to follow a
"multispecies coalescent" model, simple phylogenetic algorithms can
exhibit peculiar statistical inconsistencies in inferring species
trees. This talk will examine the statistical consistency under the
multispecies coalescent of several algorithms - based on consensus
trees, ranked gene trees, and the "minimize deep coalescences"
algorithm. A summary will be presented of the known consistency
properties of the various algorithms.

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