543 research outputs found
Immunization of Rabbits with Purified Nicotinic Acetylcholine Receptor
Immunization of rabbits, rats and guinea pigs with nicotinic
acetylcholine receptor from the electric organ of T. marmorata
leads to a production of antibodies in these animais. Simultaneously
a peripheral paralysis is seen, particularly .pronounced in rabbits.
In rats the symptoms are transient. The antibody titres in rabbits
are correlated to the visible symptoms. The highest antibody titres
are found in the most affected animals. Electrophysiolog;ical,
immunological and morphological analysis indicate disturbances of
the neuromuscular function, probably on the post.synaptic site.
Thymus reactions may also be involved as a thymit has been found
in the immunized rabbits
Immunization of Rabbits with Purified Nicotinic Acetylcholine Receptor
Immunization of rabbits, rats and guinea pigs with nicotinic
acetylcholine receptor from the electric organ of T. marmorata
leads to a production of antibodies in these animais. Simultaneously
a peripheral paralysis is seen, particularly .pronounced in rabbits.
In rats the symptoms are transient. The antibody titres in rabbits
are correlated to the visible symptoms. The highest antibody titres
are found in the most affected animals. Electrophysiolog;ical,
immunological and morphological analysis indicate disturbances of
the neuromuscular function, probably on the post.synaptic site.
Thymus reactions may also be involved as a thymit has been found
in the immunized rabbits
Valuing initial teacher education at Master's level
The future of Masterâs-level work in initial teacher education (ITE) in England seems uncertain. Whilst the coalition government has expressed support for Masterâs-level work, its recent White Paper focuses on teaching skills as the dominant form of professional development. This training discourse is in tension with the view of professional learning advocated by ITE courses that offer Masterâs credits. Following a survey of the changing perceptions of Masterâs-level study during a Post Graduate Certificate in Education course by student teachers in four subject groups, this paper highlights how the process of professional learning can have the most impact on how they value studying at a higher level during their early professional development
Wigs, disguises and child's play : solidarity in teacher education
It is generally acknowledged that much contemporary education takes place within a dominant audit culture, in which accountability becomes a powerful driver of educational practices. In this culture both pupils and teachers risk being configured as a means to an assessment and target-driven end: pupils are schooled within a particular paradigm of education. The article discusses some ethical issues raised by such schooling, particularly the tensions arising for teachers, and by implication, teacher educators who prepare and support teachers for work in situations where vocational aims and beliefs may be in in conflict with instrumentalist aims. The article offers De Certeauâs concept of âla perruqueâ to suggest an opening to playful engagement for human ends in education, as a way of contending with and managing the tensions generated. I use the concept to recover a concept of solidarity for teacher educators and teachers to enable ethical teaching in difficult times
Cross Section Measurements Using the Zero Degree Detector
The Zero Degree Detector (ZDD) is an instrument that has been used in accelerator exposures to measure the angular dependence of particles produced in heavy ion fragmentation experiments. The ZDD uses two identical layers of pixelated silicon detectors that make coincident measurements over the active area of the instrument. The angular distribution of secondary particle produced in nuclear interactions for several heavy ions: and target materials will be presented along with performance characteristic of the instrument
Stable isotope characterization of pedogenic and lacustrine carbonates from the Chinese Tian Shan: constraints on the Mesozoic - Lower Cenozoic palaeo-environmental evolution
International audienceIn the MesozoicâCenozoic continental deposits of the Tian Shan area, two main levels containing pedogenic carbonates have been identified on both the southern and northern foothills of the range: one in the Upper Jurassic series and one in the Upper CretaceousâLower Palaeocene series. In order to reconstruct the palaeoenvironmental and palaeotopographic characteristics of the Tian Shan area during these two periods, we measured the oxygen and carbon isotope composition of these pedogenic carbonates (calcrete and nodules). The stable isotope compositions are homogeneous: most ÎŽ18O values are between 21 and 25â° and most ÎŽ13C values are between â4 and â6â°. No distinction can be made between the calcrete and nodule isotopic compositions. The constancy of isotopic values across the Tian Shan is evidence of a development of these calcification features in similar palaeoenvironmental conditions. The main inference is that no significant relief existed in that area at the CretaceousâPalaeogene boundary, implying that most of the present relief developed later, during the Cenozoic. In addition to the pedogenic carbonates, few beds of limestones interstratified in the Jurassic series of the southern foothills display oxygen and carbon isotope compositions typical of lacustrine carbonates, ruling out brackish water incursion at that period in the regio
From Quantum Systems to L-Functions: Pair Correlation Statistics and Beyond
The discovery of connections between the distribution of energy levels of
heavy nuclei and spacings between prime numbers has been one of the most
surprising and fruitful observations in the twentieth century. The connection
between the two areas was first observed through Montgomery's work on the pair
correlation of zeros of the Riemann zeta function. As its generalizations and
consequences have motivated much of the following work, and to this day remains
one of the most important outstanding conjectures in the field, it occupies a
central role in our discussion below. We describe some of the many techniques
and results from the past sixty years, especially the important roles played by
numerical and experimental investigations, that led to the discovery of the
connections and progress towards understanding the behaviors. In our survey of
these two areas, we describe the common mathematics that explains the
remarkable universality. We conclude with some thoughts on what might lie ahead
in the pair correlation of zeros of the zeta function, and other similar
quantities.Comment: Version 1.1, 50 pages, 6 figures. To appear in "Open Problems in
Mathematics", Editors John Nash and Michael Th. Rassias. arXiv admin note:
text overlap with arXiv:0909.491
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