812 research outputs found
A new species of the Patagonian Genus Vilcunia, with remarks on its morphology, ecology and distribution
A new species of the genus Vilcunia from near Lago Belgrano, 47°50' South latitude, Santa Cruz, Argentina, is described. The morphology of the new species, V. periglacialis sp. nov. and the closely related V. silvanao are compared and a redescription of V. silvanae is made. Both species are of biogeographical interest given their distribution in the basaltic mesetas of the slopes of the Patagonian Andes.Material digitalizado en SEDICI gracias a la colaboración del Dr. Jorge Williams (FCNM-UNLP).Facultad de Ciencias Naturales y Muse
The true systematic status of Liolaemus misleali Donoso Barros and Cei, 1971, from Northern Patagonia, Argentina (Reptilia, Iguanidae)
The taxonomic status of the poorly known Patagonian Lizard Liolaemus ruizleali has been revised according to its only extant holotype and paratypes. It is a composite species: the holotype and two paratypes belong to Liolaemus rothi Koslowsky, 1898, the other four paratypes to Liolaemus kingi somuncurae Cei and Scolaro, 1981. The synonymic list of these latter species is readjusted.Material digitalizado en SEDICI gracias a la colaboración del Dr. Jorge Williams (FCNM-UNLP).Facultad de Ciencias Naturales y Muse
A new species of the Patagonian Genus Vilcunia, with remarks on its morphology, ecology and distribution
A new species of the genus Vilcunia from near Lago Belgrano, 47°50' South latitude, Santa Cruz, Argentina, is described. The morphology of the new species, V. periglacialis sp. nov. and the closely related V. silvanao are compared and a redescription of V. silvanae is made. Both species are of biogeographical interest given their distribution in the basaltic mesetas of the slopes of the Patagonian Andes.Material digitalizado en SEDICI gracias a la colaboración del Dr. Jorge Williams (FCNM-UNLP).Facultad de Ciencias Naturales y Muse
The true systematic status of Liolaemus misleali Donoso Barros and Cei, 1971, from Northern Patagonia, Argentina (Reptilia, Iguanidae)
The taxonomic status of the poorly known Patagonian Lizard Liolaemus ruizleali has been revised according to its only extant holotype and paratypes. It is a composite species: the holotype and two paratypes belong to Liolaemus rothi Koslowsky, 1898, the other four paratypes to Liolaemus kingi somuncurae Cei and Scolaro, 1981. The synonymic list of these latter species is readjusted.Material digitalizado en SEDICI gracias a la colaboración del Dr. Jorge Williams (FCNM-UNLP).Facultad de Ciencias Naturales y Muse
Isolation and Amino Acid Sequence of Physalaemin, the Main Active Polypeptide of the Skin of Physalaemus fuscumaculatus
Crude methanol extracts of fresh and dried skins of Physalaemus fuscumaculatus, a South American amphibian, were subjected successively to chromatography on alkaline alumina and to countercurrent distribution. The main active constituent of these extracts, the polypeptide physalaemin, was thus obtained in a pure form. Total and partial acid hydrolysis, fission with trypsin and chymotrypsin, and end-group determination experiments demonstrated that physalaemin is an endecapeptide having the following amino acid composition and sequence: Pyr-Ala-Asp(OH)-Pro-Asp(NH2)-Lys-Phe-Tyr-Gly-Leu-Met-NH2 Some anomalies in the trypsin and chymotrypsin fission of physalaemin are discussed, and the strict chemical resemblance between physalaemin and eledoisin is pointed out.Material digitalizado en SEDICI gracias a la colaboración del Dr. Jorge Williams (FCNM-UNLP).Facultad de Ciencias Naturales y Muse
Isolation and Amino Acid Sequence of Physalaemin, the Main Active Polypeptide of the Skin of Physalaemus fuscumaculatus
Crude methanol extracts of fresh and dried skins of Physalaemus fuscumaculatus, a South American amphibian, were subjected successively to chromatography on alkaline alumina and to countercurrent distribution. The main active constituent of these extracts, the polypeptide physalaemin, was thus obtained in a pure form. Total and partial acid hydrolysis, fission with trypsin and chymotrypsin, and end-group determination experiments demonstrated that physalaemin is an endecapeptide having the following amino acid composition and sequence: Pyr-Ala-Asp(OH)-Pro-Asp(NH2)-Lys-Phe-Tyr-Gly-Leu-Met-NH2 Some anomalies in the trypsin and chymotrypsin fission of physalaemin are discussed, and the strict chemical resemblance between physalaemin and eledoisin is pointed out.Material digitalizado en SEDICI gracias a la colaboración del Dr. Jorge Williams (FCNM-UNLP).Facultad de Ciencias Naturales y Muse
Isolation and Amino Acid Sequence of Physalaemin, the Main Active Polypeptide of the Skin of Physalaemus fuscumaculatus
Crude methanol extracts of fresh and dried skins of Physalaemus fuscumaculatus, a South American amphibian, were subjected successively to chromatography on alkaline alumina and to countercurrent distribution. The main active constituent of these extracts, the polypeptide physalaemin, was thus obtained in a pure form. Total and partial acid hydrolysis, fission with trypsin and chymotrypsin, and end-group determination experiments demonstrated that physalaemin is an endecapeptide having the following amino acid composition and sequence: Pyr-Ala-Asp(OH)-Pro-Asp(NH2)-Lys-Phe-Tyr-Gly-Leu-Met-NH2 Some anomalies in the trypsin and chymotrypsin fission of physalaemin are discussed, and the strict chemical resemblance between physalaemin and eledoisin is pointed out.Material digitalizado en SEDICI gracias a la colaboración del Dr. Jorge Williams (FCNM-UNLP).Facultad de Ciencias Naturales y Muse
Neutrinos from supernovae: experimental status and perspectives
I discuss the state of the art in the search for neutrinos from galactic
stellar collapses and the future perspectives of this field. The implications
for the neutrino physics of a high statistics supernova neutrino burst
detection by the network of detectors operating around the world are also
reviewed.Comment: 19 pages, 12 figures. Extended version of talk given at IInd
International Workshop on Matter, Anti-Matter and Dark Matter, Trento
(Italy), 29-30 October 2001. A reduced version will appear in Int. J. of Mod.
Phys.
Structure and Pharmacological Actions of Physalaemin, the Main Active Polypeptide of the Skin of Physalaemus fuscumaculatus
Viene descritto il procedimento che ha permesso l’isolamento e il chiarimento della struttura chimica della fisalemina, il principale dei polipeptidi attivi della pelle di Physalaemus fuscumaculatus, anfibio dell’Argen- tina. La fisalemina, strettamente vicina all’eledoisina anche da un punto di vista chimico è, come questa, dotata di potente azione sulla muscolatura liscia vasale ed extra- vasale. Essa è nettamente distinguibile, mediante saggi paralleli, da tutti gli altri polipeptidi biogeni finora noti.Material digitalizado en SEDICI gracias a la colaboración del Dr. Jorge Williams (FCNM-UNLP).Facultad de Ciencias Naturales y Muse
Commissioning of the MEG II tracker system
The MEG experiment at the Paul Scherrer Institut (PSI) represents the state
of the art in the search for the charged Lepton Flavour Violating (cLFV) decay. With the phase 1, MEG set the new world best
upper limit on the \mbox{BR}(\mu^+ \rightarrow e^+ \gamma) < 4.2 \times
10^{-13} (90% C.L.). With the phase 2, MEG II, the experiment aims at reaching
a sensitivity enhancement of about one order of magnitude compared to the
previous MEG result. The new Cylindrical Drift CHamber (CDCH) is a key detector
for MEG II. CDCH is a low-mass single volume detector with high granularity: 9
layers of 192 drift cells, few mm wide, defined by wires in a
stereo configuration for longitudinal hit localization. The filling gas mixture
is Helium:Isobutane (90:10). The total radiation length is
\mbox{X}_0, thus minimizing the Multiple Coulomb Scattering (MCS)
contribution and allowing for a single-hit resolution m and an
angular and momentum resolutions of 6 mrad and 90 keV/c respectively. This
article presents the CDCH commissioning activities at PSI after the wiring
phase at INFN Lecce and the assembly phase at INFN Pisa. The endcaps
preparation, HV tests and conditioning of the chamber are described, aiming at
reaching the final stable working point. The integration into the MEG II
experimental apparatus is described, in view of the first data taking with
cosmic rays and beam during the 2018 and 2019 engineering runs. The
first gas gain results are also shown. A full engineering run with all the
upgraded detectors and the complete DAQ electronics is expected to start in
2020, followed by three years of physics data taking.Comment: 10 pages, 12 figures, 1 table, proceeding at INSTR'20 conference,
accepted for publication in JINS
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