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) $\mu^+ \rightarrow e^+ \gamma$ 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 $\sim 12000$ wires in a stereo configuration for longitudinal hit localization. The filling gas mixture is Helium:Isobutane (90:10). The total radiation length is $1.5 \times 10^{-3}$ \mbox{X}_0, thus minimizing the Multiple Coulomb Scattering (MCS) contribution and allowing for a single-hit resolution $< 120$ $\mu$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 $\mu^+$ 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