Mapping Vesta: First Results from Dawn’s Survey Orbit

The geologic objectives of the Dawn Mission [1] are to derive Vesta’s shape, map the surface geology, understand the geological context and contribute to the determination of the asteroids’ origin and evolution.Geomorphology and distribution of surface features will provide evidence for impact cratering, tectonic activity, volcanism, and regolith processes. Spectral measurements of the surface will provide evidence of the compositional characteristics of geological units. Age information, as derived from crater sizefrequency distributions, provides the stratigraphic context for the structural and compositional mapping results, thus revealing the geologic history of Vesta. We present here the first results of the Dawn mission from data collected during the approach to Vesta, and its first discrete orbit phase – the Survey Orbit, which lasts 21 days after the spacecraft had established a circular polar orbit at a radius of ~3000 km with a beta angle of 10°-15°

Occurrence of Toxoplasma gondii DNA in sheep naturally infected and slaughtered in abattoirs in Pernambuco, Brazil

The aim of the present study was to assess the occurrence of antibodies to Toxoplasma gondii and to detect genomic DNA of the parasite in the reproductive organs, fetuses and fetal membranes of sheep in slaughterhouses in the state of Pernambuco, Brazil. The Indirect Immunofluorescence technique (IFA) was used for screening. The Polymerase Chain Reaction (PCR) was used to detect DNA of T. gondii in the animals that were positive in the serology. In the serology, 13/50 samples were positive and genomic DNA of T. gondii was detected in one uterus, tube, ovary, placenta and fetus (heart, brain and umbilical cord) sample from a sheep that was positive in the serology. The present study provides evidence of the occurrence of T. gondii DNA in the organs of the reproductive system, placenta and fetus of a naturally infected sheep

Reference Documents for the Proposal for a NATIONAL SYNCHROTRON LIGHT SOURCE

The spectra, angular distribution and polarization functions of synchrotron radiation are tabulated in parametric form. Numerous graphs of the functions are included which can be used for rapid estimation of photon flux as a function of the various parameters. The extended synchrotron radiation source is described and the exact, but unintegrable, equations are derived. Properties of this source depend upon at least nine parameters. An approximation of the source accurate enough for estimating flux in optical instruments is developed. Power and power density in the radiation beam are described and convenient approximations are developed. Simple optical transformations are used to illustrate some of the important properties of the extended source. Also included are: (1) a brief description and short table of the Bessel functions used; (2) an outline of the properties of electron orbits in a storage ring; and (3) a description and short table of integrating function ef(a,Y)