1,202 research outputs found
Crisis Preparedness: Do School Administrators and First Responders Feel Ready to Act?
This study explored the perceptions of school principals in regards to school crisis preparedness planning and training using survey data. ANOVAs indicated that elementary schools reported greater external security measures than high schools (F = 3.17, p = .049); high schools reported greater internal security measures (F = 11.06, p = .001) and drills with first responders than elementary and middle schools (F = 6.09, p = .004). Implications for educators regarding a relationship between the perceptions of preparedness to respond to a school crisis that requires a coordinated, multi-agency effort, and the collaborative training between school districts and their first responders were discussed
Geostatistical analysis of an experimental stratigraphy
[1] A high-resolution stratigraphic image of a flume-generated deposit was scaled up to sedimentary basin dimensions where a natural log hydraulic conductivity (ln( K)) was assigned to each pixel on the basis of gray scale and conductivity end-members. The synthetic ln( K) map has mean, variance, and frequency distributions that are comparable to a natural alluvial fan deposit. A geostatistical analysis was conducted on selected regions of this map containing fluvial, fluvial/ floodplain, shoreline, turbidite, and deepwater sedimentary facies. Experimental ln(K) variograms were computed along the major and minor statistical axes and horizontal and vertical coordinate axes. Exponential and power law variogram models were fit to obtain an integral scale and Hausdorff measure, respectively. We conclude that the shape of the experimental variogram depends on the problem size in relation to the size of the local-scale heterogeneity. At a given problem scale, multilevel correlation structure is a result of constructing variogram with data pairs of mixed facies types. In multiscale sedimentary systems, stationary correlation structure may occur at separate scales, each corresponding to a particular hierarchy; the integral scale fitted thus becomes dependent on the problem size. The Hausdorff measure obtained has a range comparable to natural geological deposits. It increases from nonstratified to stratified deposits with an approximate cutoff of 0.15. It also increases as the number of facies incorporated in a problem increases. This implies that fractal characteristic of sedimentary rocks is both depositional process - dependent and problem-scale-dependent
Technology-Mediated Instruction in Distance Education and Teacher Preparation in Special Education
In this article, the authors examine the literature on distance education and offer a brief chronology of its past-to-present development, with special attention to the evolution of technology-mediated instruction. They document some of the major trends related to both theoretical and practical aspects of distance education. In particular, they look at the significance of the design of instruction and the importance of preserving faculty-student communication. Next, they look at the challenges as well as opportunities that distance education affords students, faculty, and institutions of higher education. Finally, the authors summarize what they believe to be major issues to be resolved if educators are to improve the quality of distance education and speculate about what the future might hold with regard to distance education and special education. Reprinted by permission of the publisher
Superior Mesenteric Vein Thrombosis Mimicking Acute Appendicitis
Abdominal pain is one of the most common presenting complaints to the emergency department. Mesenteric venous thrombosis represents an important cause to consider in patients with acute abdominal pain. The diagnosis is often delayed, and cases traditionally have been identified either at laparotomy or at autopsy. In this case, we describe a 21-year-old female with acute onset of right lower quadrant pain attributable to a hyperhomocysteinemia related non-occlusive superior mesenteric vein thrombosis. This case highlights how the use of computed tomography in select cases can lead to earlier recognition of this condition and increasingly allow for non-surgical treatment
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Evaluation of meaningful change in bowel move frequency for patients with carcinoid syndrome
Pariphinotus Kunkel, 1910, the senior synonym of Heterophlias Shoemaker, 1933 (Crustacea: Amphipoda: Phliantidae)
The synonymy of the genera Pariphinotus and Heterophlias has been debated many times in the literature. Historically a distinction has been maintained between these two phliantid genera because of morphological differences reported in the literature by the original descriptors and subsequent workers. Our examination of specimens of both genera demonstrates Pariphinotus and Heterophlias to be synonymous. Heterophlias has been regarded as the valid genus by most authors; Pariphinotus, however, is shown to be the senior synonym of Heterophlias
Mechanism of Magainin 2a Induced Permeabilization of Phospholipid Vesicles
The magainins, peptide antibiotics secreted by the frog Xenopus laevis, have previously been shown to permeabilize phospholipid vesicles. To elucidate the mechanism of permeabilization, we have conducted detailed kinetic studies of magainin 2 amide (mgn2a)hduced release of 6-carboxyfluorescein from vesicles of phosphatidylserine. The results show that dye release occurs in (at least) two stages-an initial rapid phase, with t1/2 â 3 s, followed by a much slower phase that approaches zero leakage rate before all the dye is released. Light-scattering studies showed that mgn2a does not cause gross changes in vesicle structure. The peptide was found to rapidly equilibrate between vesicles; this was demonstrated by determining a binding isotherm for the peptidelipid interaction, and by showing that addition of unloaded vesicles rapidly quenches peptide-induced leakage from loaded vesicles. Transient dye release in the presence of an equilibrating peptide can be explained in two ways: (1) the peptide exists only transiently in an active form; (2) the vesicles are only transiently leaky. Preincubation of mgn2a at assay concentrations in buffer alone or with unloaded vesicles did not inactivate the peptide. Therefore, rapid leakage is probably due to transient destabilization of the vesicle upon addition of mgn2a
Mechanism of Magainin 2a Induced Permeabilization of Phospholipid Vesicles
The magainins, peptide antibiotics secreted by the frog Xenopus laevis, have previously been shown to permeabilize phospholipid vesicles. To elucidate the mechanism of permeabilization, we have conducted detailed kinetic studies of magainin 2 amide (mgn2a)hduced release of 6-carboxyfluorescein from vesicles of phosphatidylserine. The results show that dye release occurs in (at least) two stages-an initial rapid phase, with t1/2 â 3 s, followed by a much slower phase that approaches zero leakage rate before all the dye is released. Light-scattering studies showed that mgn2a does not cause gross changes in vesicle structure. The peptide was found to rapidly equilibrate between vesicles; this was demonstrated by determining a binding isotherm for the peptidelipid interaction, and by showing that addition of unloaded vesicles rapidly quenches peptide-induced leakage from loaded vesicles. Transient dye release in the presence of an equilibrating peptide can be explained in two ways: (1) the peptide exists only transiently in an active form; (2) the vesicles are only transiently leaky. Preincubation of mgn2a at assay concentrations in buffer alone or with unloaded vesicles did not inactivate the peptide. Therefore, rapid leakage is probably due to transient destabilization of the vesicle upon addition of mgn2a
Sparrows can't sing : East End kith and kinship in the 1960s
Sparrows Canât Sing (1963) was the only feature film directed by
the late and much lamented Joan Littlewood. Set and filmed in
the East End, where she worked for many years, the film deserves
more attention than it has hitherto received. Littlewoodâs career
spanned documentary (radio recordings made with Ewan MacColl
in the North of England in the 1930s) to directing for the stage
and the running of the Theatre Royal in Londonâs Stratford East,
often selecting material which aroused memories in local audiences
(Leach 2006: 142). Many of the actors trained in her Theatre
Workshop subsequently became better known for their appearances
on film and television. Littlewood herself directed hardly any material
for the screen: Sparrows Canât Sing and a 1964 series of television
commercials for the British Egg Marketing Board, starring Theatre
Workshopâs Avis Bunnage, were rare excursions into an area of practice
which she found constraining and unamenable (Gable 1980: 32).
The hybridity and singularity of Littlewoodâs feature may answer,
in some degree, for its subsequent neglect. However, Sparrows Canât
Sing makes a significant contribution to a group of films made in
Britain in the 1960s which comment generally on changes in the
urban and social fabric. It is especially worthy of consideration,
I shall argue, for the use which Littlewood made of a particular
communityâs attitudes â sentimental and critical â to such changes and
for its amalgamation of an attachment to documentary techniques
(recording an aural landscape on location) with a preference for nonnaturalistic
delivery in performance
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