Depredation attempt of the snake Drymarchon melanurus on the tortoise Gopherus evgoodei

This note reports an attempted predation of the Central American Indigo Snake, Drymarchon melanurus, on a hatchling of the Goode’s Thornscrub Tortoise, Gopherus evgoodei, in Parque La Colorada, a conservation area in Alamos, Sonora.Esta nota documenta un intento de depredación de la culebra arroyera de cola negra, Drymarchon melanurus, sobre una cría de la tortuga sinaloense de matorral, Gopherus evgoodei, en el Parque La Colorada, Área Destinada Voluntariamente a la Conservación en Álamos, Sonora.Fil: Lara Resendiz, Rafael Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; Argentin

Nocturnal Behavior of Clark’s Spiny Lizard (Sceloporus clarkii; Squamata; Lacertilia) in Acaponeta, Nayarit, México

There are several documented reports of nocturnal activity in reptiles considered exclusively diurnal (Lara- Resendiz 2020, Perry et al. 2008). Clark?s Spiny Lizard (Sceloporus clarkii) is considered a diurnal active species, but there is a single observation of an adult male attempting to feed on moths at night over a two-hour period (Martínez-Méndez et al. 2013). Herein we report on additional nocturnal activities of S. clarkii and include descriptive thermal data.Fil: Loc Barragán, Jesús A.. Tecnológico Nacional de México. Instituto Tecnológico Superior de Zacapoaxtla. Maestría en Ciencias Ambientales; MéxicoFil: Lara Resendiz, Rafael Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; ArgentinaFil: Woolrich Piña, Guillermo A.. Tecnológico Nacional de México. Instituto Tecnológico Superior de Zacapoaxtla; Méxic

Pseudotomodon Trigonatus (false tomodon snake): Habitat

Pseudotomodon trigonatus is a dipsadid snake endemic to Argentina. It is mainly distributed in the Monte Desert ecoregion, but it also occurs in the Mountain Chaco (Giraudo and Scrocchi 2002. Smithsonian Herpetological Information Service 1321–53; Avila 1997. Herpetol. Rev. 28:98). It is generally associated with xerophytic environments in the Monte Desert, and in rocky habitats in the Mountain Chaco...Fil: Pelegrin, Nicolas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; ArgentinaFil: Lara Resendiz, Rafael Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; ArgentinaFil: Muniz Leao, Suelem. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; ArgentinaFil: Sánchez, José Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; Argentin

Water-soluble polyphosphonate-based bottlebrush copolymers via aqueous ring-opening metathesis polymerization

Ring-opening metathesis polymerization (ROMP) is a versatile method for synthesizing complex macromolecules from various functional monomers. In this work, we report the synthesis of water-soluble and degradable bottlebrush polymers, based on polyphosphoesters (PPEs) via ROMP. First, PPE-macromonomers were synthesized via organocatalytic anionic ring-opening polymerization of 2-ethyl-2-oxo-1,3,2-dioxaphospholane using N-(hydroxyethyl)-cis-5-norbornene-exo-2,3-dicarboximide as the initiator and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as the catalyst. The resulting norbornene-based macromonomers had degrees of polymerization (DPn) ranging from 25 to 243 and narrow molar mass dispersity (Đ ≤ 1.10). Subsequently, these macromonomers were used in ROMP with the Grubbs 3rd-generation bispyridyl complex (Ru-G3) to produce a library of well-defined bottlebrush polymers. The ROMP was carried out either in dioxane or in aqueous conditions, resulting in well-defined and water-soluble bottlebrush PPEs. Furthermore, a two-step protocol was employed to synthesize double hydrophilic diblock bottlebrush copolymers via ROMP in water at neutral pH-values. This general protocol enabled the direct combination of PPEs with ROMP to synthesize well-defined bottlebrush polymers and block copolymers in water. Degradation of the PPE side chains was proven resulting in low molar mass degradation products only. The biocompatible and biodegradable nature of PPEs makes this pathway promising for designing novel biomedical drug carriers or viscosity modifiers, as well as many other potential applications.</p

New records of the snake Enulius Oligostichus in Sinaloa and comments on its distribution

Se describen dos nuevos registros de la culebra cola larga mexicana (Enulius oligostichus) en la Reserva Ecológica del Mineral de Nuestra Señora de la Candelaria, Cosalá, Sinaloa. Hasta la fecha, solo existía un registro en Sinaloa, pero en este trabajo, después de 55 años, ratificamos la presencia de esta serpiente en el estado, siendo los registros más norteños adyacentes a Durango.We report two new records of the Mexican long-tailed snake (Enulius oligostichus) in the Ecological Reserve of Mineral de Nuestra Señora de la Candelaria, Cosalá, Sinaloa. Until now, there was only one record in Sinaloa, but in this work, after 55 years, we confirm the presence of this species in the state, which represents the northernmost records adjacent to Durango.Fil: Lara Resendiz, Rafael Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Diversidad y Ecología Animal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Diversidad y Ecología Animal; ArgentinaFil: González, José David Jacobo. Reserva Ecológica del Mineral de Nuestra Señora Mundo Natural; Méxic

Step-growth titanium-catalysed dehydropolymerisation of amine-boranes

Titanium-catalysed dehydropolymerisation of primary amine–boranes was found to proceed via a step-growth rather than a chain-growth mechanism.</p

Boron–nitrogen main chain analogues of polystyrene:poly(<i>B</i>-aryl)aminoboranes via catalytic dehydrocoupling

High molecular weight B-arylated polyaminoboranes are obtained via catalytic dehydropolymerisation of B-aryl amine–boranes and represent the first inorganic polystyrene analogues with a B–N main chain.</p