6,705 research outputs found
Autonomous Systems as Legal Agents: Directly by the Recognition of Personhood or Indirectly by the Alchemy of Algorithmic Entities
The clinical manifestations of platelet dense (δ) granule defects are easy bruising, as well as epistaxis and bleeding after delivery, tooth extractions and surgical procedures. The observed symptoms may be explained either by a decreased number of granules or by a defect in the uptake/release of granule contents. We have developed a method to study platelet dense granule storage and release. The uptake of the fluorescent marker, mepacrine, into the platelet dense granule was measured using flow cytometry. The platelet population was identified by the size and binding of a phycoerythrin-conjugated antibody against GPIb. Cells within the discrimination frame were analysed for green (mepacrine) fluorescence. Both resting platelets and platelets previously stimulated with collagen and the thrombin receptor agonist peptide SFLLRN was analysed for mepacrine uptake. By subtracting the value for mepacrine uptake after stimulation from the value for uptake without stimulation for each individual, the platelet dense granule release capacity could be estimated. Whole blood samples from 22 healthy individuals were analysed. Mepacrine incubation without previous stimulation gave mean fluorescence intensity (MFI) values of 83±6 (mean ± 1 SD, range 69–91). The difference in MFI between resting and stimulated platelets was 28±7 (range 17–40). Six members of a family, of whom one had a known δ-storage pool disease, were analysed. The two members (mother and son) who had prolonged bleeding times also had MFI values disparate from the normal population in this analysis. The values of one daughter with mild bleeding problems but a normal bleeding time were in the lower part of the reference interval
The State of Education in Alabama’s K-12 Rural Public Schools
The purpose of this study was to compare Alabama’s rural school districts with its city, suburban, and town districts. Descriptive statistics were used for this population study, with effect sizes calculated using Cohen’s d. Findings indicated Alabama’s rural school districts serve slightly less affluent student populations, with a lower percentage of minority students, than their counterparts. They are funded at slightly lower levels than their counterparts in other categories, yet spend approximately the same percentage of their budgets on administration and on instruction. They spend a considerably higher percentage on transportation. Although rural district dropout rates are similar to those of their counterparts, from the third to the eleventh grade, student performance on standardized examinations falls gradually behind that of the students in other locale categories
Simulation of electron paramagnetic resonance spectra of spin-labeled molecules from replica-exchange molecular dynamics
Metastability of life
The physical idea of the natural origin of diseases and deaths has been
presented. The fundamental microscopical reason is the destruction of any
metastable state by thermal activation of a nucleus of a nonreversable change.
On the basis of this idea the quantitative theory of age dependence of death
probability has been constructed. The obtained simple Death Laws are very
accurately fulfilled almost for all known diseases.Comment: 3 pages, 4 figure
InteracciĂłn de la tiorredoxina TrxA de la cianobacteria Synechocystis sp. PCC 6803 con proteĂnas de membrana
Anharmonicity and self-similarity of the free energy landscape of protein G
The near-native free energy landscape of protein G is investigated through
0.4 microseconds-long atomistic molecular dynamics simulations in explicit
solvent. A theoretical and computational framework is used to assess the
time-dependence of salient thermodynamical features. While the quasi-harmonic
character of the free energy is found to degrade in a few ns, the slow modes
display a very mild dependence on the trajectory duration. This property
originates from a striking self-similarity of the free energy landscape
embodied by the consistency of the principal directions of the local minima,
where the system dwells for several ns, and of the virtual jumps connecting
them.Comment: revtex, 6 pages, 5 figure
A Study of School Size among Alabama’s Public High Schools
The purpose of this study was to examine the relationship between the size of Alabama’s public high schools, selected school quality and financial indicators, and their students’ performance on standardized exams. When the socioeconomic level of the student bodies is held constant, the size of high schools in Alabama has relatively little relationship with 11th grade student (both regular and special education) performance on the reading and math portions of the AHSGE. High schools’ average daily attendance rates and pupil-to-computer (and computer with Internet connections) ratios do not vary in accordance with school size. Higher percentages of highly qualified teachers are found in Alabama’s largest high schools. There was very little difference in the percentage of teachers with a master’s degree or above across school size categories. Very little difference exists across size categories in regard to mean expenditures per pupil (range = 7,829). However, districts of the large high schools exert over twice the effort of those with small high schools (3.2 mills to 1.5 mills) and approximately 50 percent greater local effort than the districts of the medium-size high schools
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