Monthly Archives: August 2011

electron microscopy

An introduction to Electron Microscopy lecture by Eva Nogales

Visualizing Biological Structure using Electron Microscopy: from Molecules to Cells

data visualization

The Grigorieff Lab at Brandeis University, a facility that uses high-resolution electron microscopy (EM) to study the three-dimensional (3D) structure of proteins and protein complexes. here are more information about the activity of the lab 

 

 

 

 

 

media ecologies

in Guattari’s Chaosmosis, media ecologies do not act with the goal of preserving the species that inhabit them, but function by encouraging the

creation and development of unprecedented formations of subjectivity that have never been seen (Guattari, 1995, p.91).

His notion of ecology is not incompatible to the one proposed by Stengers. However,  Guattari’s vision appears to suggest a dynamism that aspires at transcending, more than just constructing a variety of practices through what Stengers had defined a “reciprocal capture.” In other words, Guattari seems to suggest that media ecologies are not just facilitating and enabling symbiotic and parasitic (thus necessarily interconnected) relations but radical transformations and unexpected formations.

ecological practices

In Cosmopolitics, Isabelle Stengers defines ecologic practice as a political practice in the broad sense:

Ecologic practice is related to the production of values, to the proposal of new modes of evaluation, new meanings. but those values, modes of evaluation and meanings do not transcend the situation in question, they do not constitute its intelligible truth. they are about the production of new relations that are added to a situation already produced by a multiplicity of relations (p. 33)

this ecological perspective does not correspond to a consensus situation, where

the population of our practices finds itself subjected to criteria that transcend their diversity in the name of a shared intent, a superior good, for an ideal peace.” (p. 35)

In fact, ecology doesn’t understand consensus, but symbiosis in which every protagonist is interested in the success of the other “for its own reason”. the process created then can be defined as the one of a “reciprocal capture.”

a question of scale

an educational interactive animation disseminated by the Genetics Learning Center at the University of Utah, comparing different particles and microscopic entities.

SEM

A more recent introduction in microscopy, the Scanning Electron Microscope

uses a focused beam of high-energy electrons to generate a variety of signals at the surface of solid specimens (from http://serc.carleton.edu/).

A video from the Wellcome collection

TEM

Transmission Electron Microscope.

TEMs use electrons as “light source” and their much lower wavelength makes it possible to get a resolution a thousand times better than with a light microscope(from the Nobel Prize website)

Hypothesized in 1929 by Knoll and Ruska at the Technische Hochschule, it was first built in 1932. A North American prototype of the transmission electron microscope (TEM) was constructed starting in 1937 at the University of Toronto. For a detailed account of the history and the politics involved in its construction and its initial and later applications see Rasmussen, N, in Studies In History and Philosophy of Science Part A, 1996

 

TEM