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3. Glacier surface habitats.

Author

Bagshaw, E. A., primary, Stibal, M., additional, Anesio, A. M., additional, Bellas, C., additional, Tranter, M., additional, Telling, J., additional, and Wadham, J. L., additional

Published
2012
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16. The mass-area relationship within cryoconite holes and its implications for primary production

Author

Cook, J., Hodson, A., Telling, J., Anesio, A., Irvine-Fynn, T., and Bellas, C.

Abstract

Linear relationships between the mass of sediment present in a cryoconite hole and the hole area are described for a range of glacier and ice-sheet surfaces. The strong relationships found indicate that some mechanism regulates the thickness of the layer of sediment occupying the 'floor' of the hole. We find that this regulation process responds immediately to the addition of new debris to a hole and infer that it is caused by lateral thermal conduction from the debris to the hole wall. This causes hole widening by melt, and a redistribution of the debris within then takes place, usually resulting in 0.04–0.20 g cm–2 of debris in a layer of single cryoconite grains. The thinning of the debris layer during hole widening also reduces self-shading and thus maximizes the exposure of cryoconite to solar radiation. We explore the implications of the hole widening for biological production. Net photosynthesis (CO2 fixation) is shown to be favoured by thin debris layers, whilst net heterotrophy (CO2 respiration) occurs when debris layers are in excess of 2–4 mm. We conclude that the carbon balance of cryoconite holes is sensitive to the thickness of the debris and that the thermodynamic equilibration of the debris thickness helps the ecosystem to maximize primary production during the summer.

Published
2010

17. The MHC-related protein 1 (MR1) is expressed by a subpopulation of CD38+, IgA+ cells in the human intestinal mucosa

Author

Gozalbo-López, B., Del Moral, G. M., Campos-Martín, Y., Setién, F., Martín, P., Bellas, C., Regueiro, J. R., and EDUARDO MARTINEZ-NAVES

Subjects
Mucosa, Plasma cell, 61 - Medicina
Abstract

MHC-related 1 (MR1) molecule is a nonclassical member of the MHC class I family of proteins. The sequence homology between classical MHC class I molecules and MR1 is very high, although the MR1 gene is not polymorphic and is highly conserved between species. MR1 is the restriction molecule of a sub-population of T lymphocytes, which are CD4-,CD8- and display conserved TCR a chain. The function of these cells is currently unknown, but they are believed to have regulatory properties similar to those of the CD1d restricted NKT cells. The MR1 gene is ubiquitously transcribed; however it is unknown what types of cells express the MR1 protein “in vivo”. In the present work we analyzed the expression of the MR1 protein using specific antisera and monoclonal antibodies in different human cell lines, in primary cells and in mucosal tissues. We found some lymphoid cell lines that express MR1 on the cell surface but at levels much lower than the MR1 transfected cell lines. In addition, we observed that expression of MR1 in the mucosa is restricted to a subpopulation of plasma cells or plasmablasts, CD38+ or CD138+ and IgA+, located in the human intestinal mucosa. This suggests a function for MR1 in the development of IgA producing plasma cells.

Published
2009

20. Chapter Four - Polar Marine Microorganisms and Climate Change.

Author

Verde, C., Giordano, D., Bellas, C. M., di Prisco, G., and Anesio, A. M.

Abstract

The large diversity of marine microorganisms harboured by oceans plays an important role in planet sustainability by driving globally important biogeochemical cycles; all primary and most secondary production in the oceans is performed by microorganisms. The largest part of the planet is covered by cold environments; consequently, cold-adapted microorganisms have crucial functional roles in globally important environmental processes and biogeochemical cycles cold-adapted extremophiles are a remarkable model to shed light on the molecular basis of survival at low temperature. The indigenous populations of Antarctic and Arctic microorganisms are endowed with genetic and physiological traits that allow them to live and effectively compete at the temperatures prevailing in polar regions. Some genes, e.g. glycosyltransferases and glycosylsynthetases involved in the architecture of the cell wall, may have been acquired/retained during evolution of polar strains or lost in tropical strains. This present work focusses on temperature and its role in shaping microbial adaptations; however, in assessing the impacts of climate changes on microbial diversity and biogeochemical cycles in polar oceans, it should not be forgotten that physiological studies need to include the interaction of temperature with other abiotic and biotic factors. [ABSTRACT FROM AUTHOR]

Published
2016
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21. Microbial nitrogen cycling on the Greenland Ice Sheet

Author

Telling, J., primary, Stibal, M., additional, Anesio, A. M., additional, Tranter, M., additional, Nias, I., additional, Cook, J., additional, Bellas, C., additional, Lis, G., additional, Wadham, J. L., additional, Sole, A., additional, Nienow, P., additional, and Hodson, A., additional

Published
2012
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33. Gastric B-cell mucosa-associated lymphoid tissue (MALT) lymphoma. Clinicopathological study and evaluation of the prognostic factors in 143 patients

Author

Montalbàn, C., primary, Castrillo, M.J., additional, Abraira, V., additional, Serrano, M., additional, Bellas, C., additional, Piris, M.A., additional, Carrion, R., additional, Cruz, M.A., additional, Laraña, J.G., additional, Menarguez, J., additional, Gomez-Marcos, F., additional, and Rivas, C., additional

Published
1995
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35. Waldeyer ring lymphomas. A clinicopathological study of 79 cases

Author

MENÁARGUEZ, J., primary, MOLLEJO, M., additional, CARRIÓAN, R., additional, OLIVA, H., additional, BELLAS, C., additional, FORTEZA, J., additional, MARTIN, C., additional, RUIZ-MARCELLÁAN, C., additional, MORENTE, M., additional, ROMAGOSA, V., additional, CUENA, R., additional, and PIRIS, M.A., additional

Published
1994
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36. Relating Biophysical Parameters of Coastal Marshes to Hyperspectral Reflectance Data in the Bahia Bianca Estuary, Argentina.

Author

Trilla, G. González, Pratolongo, P., Beget, M. E., Kandus, P., Marcovecchio, J., and Di Bellas, C.

Subjects
SPECTRAL reflectance measurement, SALT marshes, BIOPHYSICS, SPARTINA alterniflora, FOREST canopies, HYPERSPECTRAL imaging systems
Abstract

Salt marshes occupying the tidal fringe of estuaries and protected coasts provide valuable ecosystem services, and remote sensing is a powerful tool for their large-scale monitoring. However, in order to apply remote sensing techniques to evaluate the ecological state of salt marshes, a deeper understanding is needed about the interactions between field biophysical parameters and the sensor's reflectance. The main objective of this work is to analyze and quantify the influence of different biophysical parameters characterizing stands oì Spartirla alterniflora marshes in the Bahia Bianca Estuary, Argentina, on their spectral response. Spectral reflectance at high resolution was measured in S. alterniflora canopies under natural conditions, manipulating standing biomass by means of successive harvestings. Reflectance data were acquired using a FieldSpec® spectroradiometer, which measures in the visible, near-infrared, and shortwave-infrared spectral bands. Based on these reflectance data, spectral indices such as the normalized difference vegetation index (NDVI) were calculated for each biomass condition. Biomass, leaf area index (LAI), percent canopy cover (PCC), water content, and soil properties were also evaluated. LAI, PCC, and biomass were positively correlated between each other. As a general trend, as biomass decreased, absorption in red wavelengths decreased and reflectance in near-infrared increased. Several indices explained the variability in LAI, biomass, and PCC. For example, NDVIRouse had a positive regression with PCC CR² = 0.80, N= 75) and LAI (R² = 0.67, N= 75). Results indicate that LAI, biomass, and PCC of Spartina alterniflora could be accurately determined from spectral data. [ABSTRACT FROM AUTHOR]

Published
2013
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48. Transection of the Spermatic Vessels (Bevan’s Technique): An Experimental Study

Author

Romero-maroto, J., Nistal, M., Gonzalez-gancedo, P., Bellas, C., and Arana, A.

Abstract

Intracanalicular or intra-abdominal undescended testicles often present a difficult surgical problem, due to a vascular pedicle shortening that prohibits scrotal placement with a 1 stage orchiopexy. The division of spermatic vessels to properly place the testis in the scrotum solves the problem of the shortening of the vessels, but raises the question of whether the endocrine function and the potential for fertility are preserved.

Published
1983
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49. Case report 674: Well-differentiated lymphocytic lymphoma with skeletal involvement.

Author

Corres, J, Morales, A, Saban, J, Calvo, M, and Bellas, C

Abstract

We report the case of a man with generalized osteosclerosis secondary to well-differentiated lymphocytic lymphoma. This finding is considered to be exceptional in this type of lymphoma, especially when other organs were not found to be involved. A year after the diagnosis was established the patient appeared to be in relatively good health. The radiological pattern showed no change from the original studies, nor was there any evidence of neoplastic involvement in any other location. [ABSTRACT FROM AUTHOR]

Published
1991

50. Glacier surface habitats

Author

Bagshaw, E. A., Stibal, M., Anesio, A. M., Bellas, C., Tranter, M., Jon Telling, and Wadham, J. L.

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