57 research outputs found
BAIKAL experiment: status report
We review the present status of the Baikal Neutrino Project and present the
results obtained with the deep underwater neutrino telescope NT-200.Comment: 4 pages, 3 figures. Presented at TAUP 2001 (7th international
workshop on Topics in Astroparticle and Underground Physics), Sep. 2001,
Laboratori Nazionali del Gran Sasso, Assergi, Ital
Simultaneous measurements of water optical properties by AC9 transmissometer and ASP-15 Inherent Optical Properties meter in Lake Baikal
Measurements of optical properties in media enclosing Cherenkov neutrino
telescopes are important not only at the moment of the selection of an adequate
site, but also for the continuous characterization of the medium as a function
of time. Over the two last decades, the Baikal collaboration has been measuring
the optical properties of the deep water in Lake Baikal (Siberia) where, since
April 1998, the neutrino telescope NT-200 is in operation. Measurements have
been made with custom devices. The NEMO Collaboration, aiming at the
construction of a km3 Cherenkov neutrino detector in the Mediterranean Sea, has
developed an experimental setup for the measurement of oceanographic and
optical properties of deep sea water. This setup is based on a commercial
transmissometer. During a joint campaign of the two collaborations in March and
April 2001, light absorption, scattering and attenuation in water have been
measured. The results are compatible with previous ones reported by the Baikal
Collaboration and show convincing agreement between the two experimental
techniques.Comment: 16 pages, submitted to NIM-
Transcriptome profiling of ontogeny in the acridid grasshopper Chorthippus biguttulus
Acridid grasshoppers (Orthoptera:Acrididae) are widely used model organisms
for developmental, evolutionary, and neurobiological research. Although there
has been recent influx of orthopteran transcriptomic resources, many use
pooled ontogenetic stages obscuring information about changes in gene
expression during development. Here we developed a de novo transcriptome
spanning 7 stages in the life cycle of the acridid grasshopper Chorthippus
biguttulus. Samples from different stages encompassing embryonic development
through adults were used for transcriptomic profiling, revealing patterns of
differential gene expression that highlight processes in the different life
stages. These patterns were validated with semi-quantitative RT-PCR. Embryonic
development showed a strongly differentiated expression pattern compared to
all of the other stages and genes upregulated in this stage were involved in
signaling, cellular differentiation, and organ development. Our study is one
of the first to examine gene expression during post-embryonic development in a
hemimetabolous insect and we found that only the fourth and fifth instars had
clusters of genes upregulated during these stages. These genes are involved in
various processes ranging from synthesis of biogenic amines to chitin binding.
These observations indicate that post-embryonic ontogeny is not a continuous
process and that some instars are differentiated. Finally, genes upregulated
in the imago were generally involved in aging and immunity. Our study
highlights the importance of looking at ontogeny as a whole and indicates
promising directions for future research in orthopteran development
Results from the BAIKAL Neutrino Telescope
Abstract We review the present status of the Baikal Neutrino Project, present updated results on the search for high energy extraterrestrial neutrinos, fast magnetic monopoles and neutrinos induced by WIMP annihilation in the center of the Earth and compare the recorded atmospheric neutrino flux to predictions
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