531 research outputs found
Fighting Anti-Gay Abuse in Schools: The Opening Appellate Brief of Plaintiff Jamie Nabozny in \u3cem\u3eNabozny V. Podlesny\u3c/em\u3e
In Nabozny v. Podlesny, 92 F.3d 446 (7th Cir. 1996), a case of first impression, the Seventh Circuit Court of Appeals recognized the constitutional right of a gay male public school student to equal protection from anti-gay harassment and assaults. The court held that Jamie Nabozny had stated equal protection claims against his school district and three school principals for gender and sexual orientation discrimination based on allegations that, because he is gay and a boy, defendants had failed to afford him the same kinds of protection given to other harassed students. At trial on remand a jury found the three school principals liable for intentional discrimination
Fighting Anti-Gay Abuse in Schools: The Opening Appellate Brief of Plaintiff Jamie Nabozny in \u3cem\u3eNabozny V. Podlesny\u3c/em\u3e
In Nabozny v. Podlesny, 92 F.3d 446 (7th Cir. 1996), a case of first impression, the Seventh Circuit Court of Appeals recognized the constitutional right of a gay male public school student to equal protection from anti-gay harassment and assaults. The court held that Jamie Nabozny had stated equal protection claims against his school district and three school principals for gender and sexual orientation discrimination based on allegations that, because he is gay and a boy, defendants had failed to afford him the same kinds of protection given to other harassed students. At trial on remand a jury found the three school principals liable for intentional discrimination
Purification and structural characterization of the Na<sup>+</sup>-translocating ferredoxin: NAD<sup>+</sup> reductase (Rnf) complex of Clostridium tetanomorphum
Various microbial metabolisms use H+/Na+-translocating ferredoxin:NAD+ reductase (Rnf) either to exergonically oxidize reduced ferredoxin by NAD+ for generating a transmembrane electrochemical potential or reversely to exploit the latter for producing reduced ferredoxin. For cryo-EM structural analysis, we elaborated a quick four-step purification protocol for the Rnf complex from Clostridium tetanomorphum and integrated the homogeneous and active enzyme into a nanodisc. The obtained 4.27 Ã… density map largely allows chain tracing and redox cofactor identification complemented by biochemical data from entire Rnf and single subunits RnfB, RnfC and RnfG. On this basis, we postulated an electron transfer route between ferredoxin and NAD via eight [4Fe-4S] clusters, one Fe ion and four flavins crossing the cell membrane twice related to the pathway of NADH:ubiquinone reductase. Redox-coupled Na+ translocation is provided by orchestrating Na+ uptake/release, electrostatic effects of the assumed membrane-integrated FMN semiquinone anion and accompanied polypeptide rearrangements mediated by different redox steps
Superconducting properties of Nb thin films deposited on porous silicon templates
Porous silicon, obtained by electrochemical etching, has been used as a
substrate for the growth of nanoperforated Nb thin films. The films, deposited
by UHV magnetron sputtering on the porous Si substrates, inherited their
structure made of holes of 5 or 10 nm diameter and of 10 to 40 nm spacing,
which provide an artificial pinning structure. The superconducting properties
were investigated by transport measurements performed in the presence of
magnetic field for different film thickness and substrates with different
interpore spacing. Perpendicular upper critical fields measurements present
peculiar features such as a change in the H_c2(T) curvature and oscillations in
the field dependence of the superconducting resistive transition width at H=1
Tesla. This field value is much higher than typical matching fields in
perforated superconductors, as a consequence of the small interpore distance.Comment: accepted for publication on Journal of Applied Physic
Unadulterated spectral function of low energy quasiparticles: Bi-2212, nodal direction
Fitting the momentum distribution photoemission spectra to the Voigt profile
appears to be a robust procedure to purify the interaction effects from the
experimental resolution. In application to Bi-2212 high-Tc cuprates, the
procedure reveals the true scattering rate at low binding energies and
temperatures, and, consequently, the true value of the elastic scattering.
Reaching the minimal value ~ 16 meV, the elastic scattering does not reveal a
systematic dependence on doping level, but is rather sensitive to impurity
concentration, and can be explained by the forward scattering on out-of-plane
impurities. The inelastic scattering is found to form well-defined
quasiparticles with the quadratic and cubic energy dependence of the scattering
rate above and below Tc, respectively. The observed energy-temperature
asymmetry of the scattering rate is also discussed.Comment: 4 revtex pages, 4 figure
Inter- and Intragranular Effects in Superconducting Compacted Platinum Powders
Compacted platinum powders exhibit a sharp onset of diamagnetic screening at
mK in zero magnetic field in all samples investigated. This
sharp onset is interpreted in terms of the intragranular transition into the
superconducting state. At lower temperatures, the magnetic ac susceptibility
strongly depends on the ac field amplitude and reflects the small intergranular
critical current density . This critical current density shows a strong
dependence on the packing fraction f of the granular samples. Surprisingly,
increases significantly with decreasing f ( A/cm for f = 0.67 and A/cm for f
= 0.50). The temperature dependence of shows strong positive curvature
over a wide temperature range for both samples. The phase diagrams of inter-
and intragranular superconductivity for different samples indicate that the
granular structure might play the key role for an understanding of the origin
of superconductivity in the platinum compacts.Comment: 11 pages including 9 figures. To appear in Phys. Rev. B in Nov. 0
Relationships between Larval and Juvenile Abundance of Winter-Spawned Fishes in North Carolina, USA
We analyzed the relationships between the larval and juvenile abundances of selected estuarine-dependent fishes that spawn during the winter in continental shelf waters of the U.S. Atlantic coast. Six species were included in the analysis based on their ecological and economic importance and relative abundance in available surveys: spot Leiostomus xanthurus, pinfish Lagodon rhomboides, southern flounder Paralichthys lethostigma, summer flounder Paralichthys dentatus, Atlantic croaker Micropogonias undulatus, and Atlantic menhaden Brevoortia tyrannus. Cross-correlation analysis was used to examine the relationships between the larval and juvenile abundances within species. Tests of synchrony across species were used to find similarities in recruitment dynamics for species with similar winter shelf-spawning life-history strategies. Positive correlations were found between the larval and juvenile abundances for three of the six selected species (spot, pinfish, and southern flounder). These three species have similar geographic ranges that primarily lie south of Cape Hatteras. There were no significant correlations between the larval and juvenile abundances for the other three species (summer flounder, Atlantic croaker, and Atlantic menhaden); we suggest several factors that could account for the lack of a relationship. Synchrony was found among the three southern species within both the larval and juvenile abundance time series. These results provide support for using larval ingress measures as indices of abundance for these and other species with similar geographic ranges and winter shelf-spawning life-history strategies
Origin of complex crystal structures of elements at pressure
We present a unifying theory for the observed complex structures of the
sp-bonded elements under pressure based on nearly free electron picture (NFE).
In the intermediate pressure regime the dominant contribution to crystal
structure arises from Fermi-surface Brillouin zone (FSBZ) interactions -
structures which allow this are favoured. This simple theory explains the
observed crystal structures, transport properties, the evolution of internal
and unit cell parameters with pressure. We illustrate it with experimental data
for these elements and ab initio calculation for Li.Comment: 4 pages 5 figure
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