Contribution to the knowledge of the birds of Quilmes and Avellaneda (Buenos Aires, Argentina)

En este trabajo se presentan nuevos registros de aves para la costa rioplatense de los partidos de Quilmes y Avellaneda (Provincia de Buenos Aires, Argentina). La zona estudiada incluye dos áreas protegidas: Reserva Natural Municipal Los Sauces y el Parque Natural y Reserva Ecológica Municipal Selva Marginal Quilmeña, como también sectores sin categoría de conservación, abarcando en conjunto más de 300 hectáreas. Las observaciones se realizaron tanto por el Club de Observadores de Aves de Bernal como por estudiantes de la Facultad de Ciencias Naturales y Museo (Universidad Nacional de la Plata). Se adiciona un total de 31 especies nuevas en relación a trabajos anteriores, pertenecientes a las familias Tinamidae (1), Falconidae (1), Anatidae (2), Ardeidae (1), Rallidae (3), Strigidae (2), Cuculidae (1), Alcedinidae (1), Furnariidae (7), Sturnidae (1), Motacillidae (1), Thraupidae (2), Tityridae (1), Tyrannidae (5), Icteridae (2). Destacan los registros de Spartonoica maluroides (Espartillero enano) y Asthenes hudsoni (Espartillero pampeano), ambas catalogadas como vulnerables, además de varias especies categorizadas como escasas y sensibles frente a disturbios antropogénicos. También se ha observado un ejemplar de Icterus croconotus (Matico), una especie natural de la ecorregión del Chaco Húmedo. Cabe señalar el registro de Acridotheres cristatellus (Estornino crestado), ave introducida en nuestro país, cuyo impacto en las especies nativas tanto de aves como de otros animales es desconocido. Con esta contribución, se adicionan registros con valor conservacionista y el número de especies observables pasa de 124 a 155 para éste área, que se encuentra bajo un importante impacto antrópico y es considerado un posible corredor biológico entre las reservas Costanera Sur y Punta Lara.On this paper new bird registers are provided on the Quilmes and Avellaneda (Buenos Aires province, Argentina) district’s river coast. The studied region includes two preserved areas: Municipal Natural Reserve Los Sauces and Natural Park and Municipal Ecologic Reserve Selva Marginal Quilmeña, as well as uncategorized conservation sectors, covering, as a whole, more than 300 hectares. Observations were made by the Bernal’s Bird Observers Club, as well as by students from Facultad de Ciencias Naturales y Museo (Universidad Nacional de La Plata). 31 new species were added in comparison to old papers, belonging to the families Tinamidae (1), Falconidae (1), Anatidae (2), Ardeidae (1), Rallidae (3), Strigidae (2), Cuculidae (1), Alcedinidae (1), Furnariidae (7), Sturnidae (1), Motacillidae (1), Thraupidae (2), Tityridae (5), Icteridae (2). Registers on Spartonoica maluroides (Bay-capped Wren-spinetail) and Asthenes hudsoni (Hudson's Canastero) stand out, both of them labeled as vulnerable, besides several other species classified as scarce and sensitive to anthropogenic disturbances. A single specimen of Icterus croconotus (Orange-backed Troupial), a native species from Chaco Húmedo (Wet Chaco) ecoregion, was spotted too. It is noteworthy to point out the recording of Acridotheres cristatellus (Crested Myna), a bird that was introduced in our country and whose impact on native birds and other animal species is unknown. With this contribution, registers with conservationist value were added, and the number of observable species rises from 124 to 155 for this area, which is under an important antropic impact, and it is considered a possible ecological corridor between Punta Lara and Costanera Sur natural reserves.Facultad de Ciencias Naturales y Muse

Contribution to the knowledge of the birds of Quilmes and Avellaneda (Buenos Aires, Argentina)

En este trabajo se presentan nuevos registros de aves para la costa rioplatense de los partidos de Quilmes y Avellaneda (Provincia de Buenos Aires, Argentina). La zona estudiada incluye dos áreas protegidas: Reserva Natural Municipal Los Sauces y el Parque Natural y Reserva Ecológica Municipal Selva Marginal Quilmeña, como también sectores sin categoría de conservación, abarcando en conjunto más de 300 hectáreas. Las observaciones se realizaron tanto por el Club de Observadores de Aves de Bernal como por estudiantes de la Facultad de Ciencias Naturales y Museo (Universidad Nacional de la Plata). Se adiciona un total de 31 especies nuevas en relación a trabajos anteriores, pertenecientes a las familias Tinamidae (1), Falconidae (1), Anatidae (2), Ardeidae (1), Rallidae (3), Strigidae (2), Cuculidae (1), Alcedinidae (1), Furnariidae (7), Sturnidae (1), Motacillidae (1), Thraupidae (2), Tityridae (1), Tyrannidae (5), Icteridae (2). Destacan los registros de Spartonoica maluroides (Espartillero enano) y Asthenes hudsoni (Espartillero pampeano), ambas catalogadas como vulnerables, además de varias especies categorizadas como escasas y sensibles frente a disturbios antropogénicos. También se ha observado un ejemplar de Icterus croconotus (Matico), una especie natural de la ecorregión del Chaco Húmedo. Cabe señalar el registro de Acridotheres cristatellus (Estornino crestado), ave introducida en nuestro país, cuyo impacto en las especies nativas tanto de aves como de otros animales es desconocido. Con esta contribución, se adicionan registros con valor conservacionista y el número de especies observables pasa de 124 a 155 para éste área, que se encuentra bajo un importante impacto antrópico y es considerado un posible corredor biológico entre las reservas Costanera Sur y Punta Lara.On this paper new bird registers are provided on the Quilmes and Avellaneda (Buenos Aires province, Argentina) district’s river coast. The studied region includes two preserved areas: Municipal Natural Reserve Los Sauces and Natural Park and Municipal Ecologic Reserve Selva Marginal Quilmeña, as well as uncategorized conservation sectors, covering, as a whole, more than 300 hectares. Observations were made by the Bernal’s Bird Observers Club, as well as by students from Facultad de Ciencias Naturales y Museo (Universidad Nacional de La Plata). 31 new species were added in comparison to old papers, belonging to the families Tinamidae (1), Falconidae (1), Anatidae (2), Ardeidae (1), Rallidae (3), Strigidae (2), Cuculidae (1), Alcedinidae (1), Furnariidae (7), Sturnidae (1), Motacillidae (1), Thraupidae (2), Tityridae (5), Icteridae (2). Registers on Spartonoica maluroides (Bay-capped Wren-spinetail) and Asthenes hudsoni (Hudson's Canastero) stand out, both of them labeled as vulnerable, besides several other species classified as scarce and sensitive to anthropogenic disturbances. A single specimen of Icterus croconotus (Orange-backed Troupial), a native species from Chaco Húmedo (Wet Chaco) ecoregion, was spotted too. It is noteworthy to point out the recording of Acridotheres cristatellus (Crested Myna), a bird that was introduced in our country and whose impact on native birds and other animal species is unknown. With this contribution, registers with conservationist value were added, and the number of observable species rises from 124 to 155 for this area, which is under an important antropic impact, and it is considered a possible ecological corridor between Punta Lara and Costanera Sur natural reserves.Facultad de Ciencias Naturales y Muse

Contribution to the knowledge of the birds of Quilmes and Avellaneda (Buenos Aires, Argentina)

En este trabajo se presentan nuevos registros de aves para la costa rioplatense de los partidos de Quilmes y Avellaneda (Provincia de Buenos Aires, Argentina). La zona estudiada incluye dos áreas protegidas: Reserva Natural Municipal Los Sauces y el Parque Natural y Reserva Ecológica Municipal Selva Marginal Quilmeña, como también sectores sin categoría de conservación, abarcando en conjunto más de 300 hectáreas. Las observaciones se realizaron tanto por el Club de Observadores de Aves de Bernal como por estudiantes de la Facultad de Ciencias Naturales y Museo (Universidad Nacional de la Plata). Se adiciona un total de 31 especies nuevas en relación a trabajos anteriores, pertenecientes a las familias Tinamidae (1), Falconidae (1), Anatidae (2), Ardeidae (1), Rallidae (3), Strigidae (2), Cuculidae (1), Alcedinidae (1), Furnariidae (7), Sturnidae (1), Motacillidae (1), Thraupidae (2), Tityridae (1), Tyrannidae (5), Icteridae (2). Destacan los registros de Spartonoica maluroides (Espartillero enano) y Asthenes hudsoni (Espartillero pampeano), ambas catalogadas como vulnerables, además de varias especies categorizadas como escasas y sensibles frente a disturbios antropogénicos. También se ha observado un ejemplar de Icterus croconotus (Matico), una especie natural de la ecorregión del Chaco Húmedo. Cabe señalar el registro de Acridotheres cristatellus (Estornino crestado), ave introducida en nuestro país, cuyo impacto en las especies nativas tanto de aves como de otros animales es desconocido. Con esta contribución, se adicionan registros con valor conservacionista y el número de especies observables pasa de 124 a 155 para éste área, que se encuentra bajo un importante impacto antrópico y es considerado un posible corredor biológico entre las reservas Costanera Sur y Punta Lara.On this paper new bird registers are provided on the Quilmes and Avellaneda (Buenos Aires province, Argentina) district’s river coast. The studied region includes two preserved areas: Municipal Natural Reserve Los Sauces and Natural Park and Municipal Ecologic Reserve Selva Marginal Quilmeña, as well as uncategorized conservation sectors, covering, as a whole, more than 300 hectares. Observations were made by the Bernal’s Bird Observers Club, as well as by students from Facultad de Ciencias Naturales y Museo (Universidad Nacional de La Plata). 31 new species were added in comparison to old papers, belonging to the families Tinamidae (1), Falconidae (1), Anatidae (2), Ardeidae (1), Rallidae (3), Strigidae (2), Cuculidae (1), Alcedinidae (1), Furnariidae (7), Sturnidae (1), Motacillidae (1), Thraupidae (2), Tityridae (5), Icteridae (2). Registers on Spartonoica maluroides (Bay-capped Wren-spinetail) and Asthenes hudsoni (Hudson's Canastero) stand out, both of them labeled as vulnerable, besides several other species classified as scarce and sensitive to anthropogenic disturbances. A single specimen of Icterus croconotus (Orange-backed Troupial), a native species from Chaco Húmedo (Wet Chaco) ecoregion, was spotted too. It is noteworthy to point out the recording of Acridotheres cristatellus (Crested Myna), a bird that was introduced in our country and whose impact on native birds and other animal species is unknown. With this contribution, registers with conservationist value were added, and the number of observable species rises from 124 to 155 for this area, which is under an important antropic impact, and it is considered a possible ecological corridor between Punta Lara and Costanera Sur natural reserves.Facultad de Ciencias Naturales y Muse

Can ultrasound be used to stimulate nerve tissue?

BACKGROUND: The stimulation of nerve or cortical tissue by magnetic induction is a relatively new tool for the non-invasive study of the brain and nervous system. Transcranial magnetic stimulation (TMS), for example, has been used for the functional mapping of the motor cortex and may have potential for treating a variety of brain disorders. METHODS AND RESULTS: A new method of stimulating active tissue is proposed by propagating ultrasound in the presence of a magnetic field. Since tissue is conductive, particle motion created by an ultrasonic wave will induce an electric current density generated by Lorentz forces. An analytical derivation is given for the electric field distribution induced by a collimated ultrasonic beam. An example shows that peak electric fields of up to 8 V/m appear to be achievable at the upper range of diagnostic intensities. This field strength is about an order of magnitude lower than fields typically associated with TMS; however, the electric field gradients induced by ultrasound can be quite high (about 60 kV/m(2 )at 4 MHz), which theoretically play a more important role in activation than the field magnitude. The latter value is comparable to TMS-induced gradients. CONCLUSION: The proposed method could be used to locally stimulate active tissue by inducing an electric field in regions where the ultrasound is focused. Potential advantages of this method compared to TMS is that stimulation of cortical tissue could be highly localized as well as achieved at greater depths in the brain than is currently possible with TMS

HD-PTP Is a Catalytically Inactive Tyrosine Phosphatase Due to a Conserved Divergence in Its Phosphatase Domain

The HD-PTP protein has been described as a tumor suppressor candidate and based on its amino acid sequence, categorized as a classical non-transmembrane protein tyrosine phosphatase (PTP). To date, no HD-PTP phosphorylated substrate has been identified and controversial results concerning its catalytic activity have been recently reported

Autoimmunity-Associated LYP-W620 Does Not Impair Thymic Negative Selection of Autoreactive T Cells.

A C1858T (R620W) variation in the PTPN22 gene encoding the tyrosine phosphatase LYP is a major risk factor for human autoimmunity. LYP is a known negative regulator of signaling through the T cell receptor (TCR), and murine Ptpn22 plays a role in thymic selection. However, the mechanism of action of the R620W variant in autoimmunity remains unclear. One model holds that LYP-W620 is a gain-of-function phosphatase that causes alterations in thymic negative selection and/or thymic output of regulatory T cells (Treg) through inhibition of thymic TCR signaling. To test this model, we generated mice in which the human LYP-W620 variant or its phosphatase-inactive mutant are expressed in developing thymocytes under control of the proximal Lck promoter. We found that LYP-W620 expression results in diminished thymocyte TCR signaling, thus modeling a "gain-of-function" of LYP at the signaling level. However, LYP-W620 transgenic mice display no alterations of thymic negative selection and no anomalies in thymic output of CD4(+)Foxp3(+) Treg were detected in these mice. Lck promoter-directed expression of the human transgene also causes no alteration in thymic repertoire or increase in disease severity in a model of rheumatoid arthritis, which depends on skewed thymic selection of CD4(+) T cells. Our data suggest that a gain-of-function of LYP is unlikely to increase risk of autoimmunity through alterations of thymic selection and that LYP likely acts in the periphery perhaps selectively in regulatory T cells or in another cell type to increase risk of autoimmunity

A Practical Method to Reduce Electrode Mismatch Artefacts during 4-electrode BioImpedance Spectroscopy Measurements

International audienc

Electrical conductivity interfaces scanning by ultrasonically-induced Lorentz force

International audienc

Scanning Electric Conductivity Gradients with Ultrasonically-Induced Lorentz Force

International audienc