Blurring the lines between working and conservation lands: Bird use of prairie strips on farmers\u27 fields

As part of a larger prairie strips project, this project began monitoring how farmland birds are affected by the addition of these strips to cropland. The hypothesis is that bird species presence and abundance can be positively impacted by the potential habitat provided by prairie strips

Directed Graphs of Commutative Rings with Identity

The directed graph of a ring is a graphical representation of its additive and multiplicative structure. Using the directed edge relationship (a,b) → (a+b,a ⋅ b), one can create a directed graph for every ring. This paper focuses on the structure of the sources in directed graphs of commutative rings with identity, with special concentration in the finite and reduced cases

New Piperidine alkaloids from fire ants are not sequestered by the green and black poison frog ( Dendrobates auratus )

Neotropical poison frogs possess alkaloid-based antipredator defenses which they sequester from a diet of arthropods such as oribatid mites and myrmicine ants. Alkaloid sequestration is still poorly understood and although several studies have examined its uptake, most experiments directly feed alkaloids to the frogs. Here, we examined the alkaloid uptake system in the poison frog species Dendrobates auratus by feeding it an alkaloid-containing prey item, the red imported fire ant Solenopsis invicta (Formicidae, Myrmicinae). Captive bred frogs were either fed live ants or fruit flies dusted with powdered ants for 4 months. Using GC–MS, we confirm that S. invicta contain previously described piperidine alkaloids known as solenopsins; however, none of these piperidine alkaloids was detected in the skin of D. auratus, suggesting the frogs are incapable of sequestering solenopsins from S. invicta. It is possible that D. auratus are unable to sequester fire ant piperidines due to their long hydrocarbon side chains, a feature that makes them structurally different than most known alkaloids in poison frogs

Crab cavities for linear colliders

Crab cavities have been proposed for a wide number of accelerators and interest in crab cavities has recently increased after the successful operation of a pair of crab cavities in KEK-B. In particular crab cavities are required for both the ILC and CLIC linear colliders for bunch alignment. Consideration of bunch structure and size constraints favour a 3.9 GHz superconducting, multi-cell cavity as the solution for ILC, whilst bunch structure and beam-loading considerations suggest an X-band copper travelling wave structure for CLIC. These two cavity solutions are very different in design but share complex design issues. Phase stabilisation, beam loading, wakefields and mode damping are fundamental issues for these crab cavities. Requirements and potential design solutions will be discussed for both colliders.Comment: 3 pages. To be published in proceedings of LINAC 2008, Victoria, Canad

Las prácticas corporales culturales desde una multiperspectiva: Educación Física y enseñanza

Otras prácticas corporales distintas a las deportivas, gimnasticas, lúdicomotrices y en el medio natural, “traías” por nuestros y nuestras estudiantes del Profesorado de Educación Física desde hace tiempo, comenzaron a interperlarnos a un pequeño grupo de docentes. Esta cartografía situada, además, coincidió con lo que Pich (2014) sostiene como la inclusión de la mirada de las ciencias sociales en nuestro campo.Integrantes estudiantes: MÉNDEZ, Nadia; GARCÍA CASAVILLA, Ignacio, HUENPI, Lautaro.Integrantes externo: Lic. CAROSIO, Cristina.Asesor: Dr. DUKUEN, Juan.Código del Proyecto: B230 (2019-2022).Fuente de consulta: Secretaria de Ciencia, Técnica y Vinculación de UNCo Bariloche

Metallothionein expression correlates with metastatic and proliferative potential in squamous cell carcinoma of the oesophagus

The goal of this study is to clarify whether the expression of metallothionein (MT) could affect the prognosis and the metastatic potential of squamous cell carcinoma (SCC) of the oesophagus. In paraffin-embedded specimens resected from 57 patients, MT mRNA and protein expressions were detected by in situ hybridization and immunohistochemistry respectively. The expression of MT was evaluated in respect of clinicopathologic variables and patients' survival. MT mRNA expression was significantly associated with the proportion of lymph node metastasis (71% in MT mRNA-positive tumours vs 42% in MT mRNA-negative tumours; P = 0.0343) and that of distant metastasis (29% in MT mRNA-positive tumours vs 5% in MT mRNA-negative tumours; P = 0.0452). In respect of MT protein expression, the frequency of distant metastasis was more common in MT-positive tumours than in MT-negative tumours (30% in MT-positive tumours vs 8% in MT-negative tumours; P = 0.0446). The survival rate of the patients with MT protein-negative tumours was significantly better than that of the patients with MT protein-positive tumours (P = 0.0340). There was a positive correlation between the expression of MT protein and that of proliferating cell nuclear antigen (P = 0.0018). Therefore, we conclude that MT expression, both at the mRNA and protein levels, may be a potential marker predicting metastatic and proliferative activities of oesophageal SCC. © 1999 Cancer Research Campaig

Blurring the lines between working and conservation lands: Bird use of prairie strips on farmers' fields

As part of a larger prairie strips project, this project began monitoring how farmland birds are affected by the addition of these strips to cropland. The hypothesis is that bird species presence and abundance can be positively impacted by the potential habitat provided by prairie strips.</p