385,377 research outputs found
Cytological study of Allium cepa and Allium sativum
The large number of species in the Allium genus has necessitated comparative analysis of related species which has always been used in many cases to describe patterns and directions of chromosomal evolution within a group. This study was carried out to cytologically analyse two species of Allium- Allium cepa and Allium sativum. All the four stages of cell division were observed in both species, although well spread metaphase chromosomes could not be observed in A. sativum which limited the extent to which we could cytologically evaluate the species. Allium cepa in this study show cell with a complement of sixteen chromosomes. A total chromosome length of 577.5 µm was observed in the best c-metaphase spread with the longest chromosome being 43.4µm and the shortest 27.9 µm. Further studies are still required in the karyotype analysis of A. sativum from Nigeri
Nose gear steering system for vehicle with main skids Patent
Nose gear steering system for vehicles with main skids to provide directional stability after loss of aerodynamic contro
Electroproduction of hadrons on nuclei at GeV energies
We investigate coherence length effects and hadron attenuation in lepton
scattering off nuclei in the kinematic regime of the HERMES experiment. The
elementary electron-nucleon interaction is described within the event generator
PYTHIA while a full coupled-channel treatment of the final state interactions
is included by means of a BUU transport model. The results of our calculations
are in good agreement with the experimentally measured transparency ratio of
incoherent rho0 electroproduction off Nitrogen and the multiplicity ratio R_M^h
for charged hadrons, pions, kaons, protons and anti-protons in deep inelastic
scattering off Nitrogen and Krypton targets.Comment: 17 pages, 4 figures. Proceedings of 2nd Int. Conf. on Nuclear and
Particle Physics with CEBAF at Jefferson Lab, Dubrovnik, 26-31 May 2003, to
be published in Fizika
Restoring a fluctuation-dissipation theorem in a nonequilibrium steady state
In a nonequilibrium steady state, the violation of the
fluctuation-dissipation theorem (FDT) is connected to breaking detailed
balance. For the velocity correlations of a driven colloidal particle we
calculate an explicit expression of the FDT violation. The equilibrium form of
the FDT can be restored by measuring the velocity with respect to the local
mean velocity.Comment: streamlined derivation and minor change
Gender Identities and Feminism
Many feminists (e.g. T. Bettcher and B. R. George) argue for a principle of first person authority (FPA) about gender, i.e. that we should (at least) not disavow people's gender self-categorisations. However, there is a feminist tradition resistant to FPA about gender, which I call "radical feminism”. Feminists in this tradition define gender-categories via biological sex, thus denying non-binary and trans self-identifications. Using a taxonomy by B. R. George, I begin to demystify the concept of gender. We are also able to use the taxonomy to model various feminist approaches. It becomes easier to see how conceptualisations ofgender which allow for FPA often do not allow for understanding female subjugation as being rooted in reproductive biology. I put forward a conceptual scheme: radical FPA feminism. If we accept FPA, but also radical feminist concerns, radical FPA feminism is an attractive way of conceptualising gender
- …