Extracellular catalase production by Aspergillus phoenicis.

Poster (2004, May)

Extracellular enveloped vaccinia virus is resistant to complement because of incorporation of host complement control proteins into its envelope

in Proceedings of the National Academy of Sciences of the United States of America (1998), 95

Extracellular Matrix in Testicular Differentiation

in Annals of the New York Academy of Sciences (1984), 438

Extracellular matrix receptors and mouse skin carcinogenesis: altered expression linked to appearance of early markers of tumor progression.

in Cancer Research (1992), 52(10), 2966-76

Interaction of cells with the basement membrane is important for cell proliferation and differentiation. Disruption of the basement membrane is an early event during progression of benign tumors to cancer ... [more ▼]

Interaction of cells with the basement membrane is important for cell proliferation and differentiation. Disruption of the basement membrane is an early event during progression of benign tumors to cancer. Using the techniques of immunohistochemistry and immunofluorescence, we show that cell-matrix interactions via the cell surface integrin receptors alpha 3 beta 1, alpha 5 beta 1, alpha 6 beta 4, the Mr 67,000 laminin receptor (67LR) laminin-binding protein, and the secreted matrix protein laminin are strictly regulated during differentiation of mouse epidermis. While alpha 6 beta 4 and alpha 5 beta 1 are polarized to the basal surface of basal cells in contact with the basement membrane, alpha 3 beta 1 and the non-integrin 67LR are primarily detected in the cell periphery of suprabasal cells, where cell to cell contacts are found. Sequential changes in expression of matrix receptors occur following multistage carcinogenesis of mouse skin. In an analysis of benign and malignant skin tumors induced by chemical carcinogens or oncogene transduction, we found that alpha 3 beta 1 and alpha 5 beta 1 as well as the non-integrin 67LR are sequentially down-regulated in the progression from benign to malignant, while alpha 6 beta 4 is the predominant receptor expressed in the carcinomas. Tumor expression of alpha 6 beta 4 is not polarized and is dissociated from its colocalized normal partner bullous pemphigoid antigen, which remains restricted to the basement membrane. The changes in matrix receptors are linked to appearance of keratin 13 in suprabasal regions, but always in alpha 6 beta 4 negative cells. The predominance of alpha 6 beta 4 in the proliferating cells during progression is associated with decreased expression of keratin 13 in carcinomas. These results suggest that matrix interactions with its receptors are important determinants of ordered differentiation in normal skin and show characteristic alterations during carcinogenesis that parallel changes in differentiation of the tumors. [less ▲]

Extracellular, penicillin-resistant DD-carboxypeptidase from Streptomyces SP [abstract]

in Xe Congresso Internacional de Microbiologica - Resumenes - abstracts - résumés (1970)

Extracting a common high frequency signal from Northern Quebec black spruce tree-rings with a Bayesian hierarchical model

in Climate of the Past (2009), 5

One basic premise of dendroclimatology is that tree rings can be viewed as climate proxies, i.e. rings are assumed to contain some hidden information about past climate. From a statistical perspective ... [more ▼]

One basic premise of dendroclimatology is that tree rings can be viewed as climate proxies, i.e. rings are assumed to contain some hidden information about past climate. From a statistical perspective, this extraction problem can be understood as the search of a hidden variable which represents the common signal within a collection of tree-ring width series. Classical average-based techniques used in dendrochronology have been applied to estimate the mean behavior of this latent variable. Still, depending on tree species, regional factors and statistical methods, a precise quantification of uncertainties associated to the hidden variable distribution is difficult to assess. To model the error propagation throughout the extraction procedure, we propose and study a Bayesian hierarchical model that focuses on extracting an inter-annual high frequency signal. Our method is applied to black spruce (Picea mariana) tree-rings recorded in Northern Quebec and compared to a classical average-based techniques used by dendrochronologists. [less ▲]

Extracting Intra-Domain Topology from mrinfo Probing

in 11th international Conference on Passive and active Measurement (2010, April)

Activeandpassivemeasurementsfortopologydiscoveryhave known an impressive growth during the last decade. If a lot of work has been done regarding inter-domain topology discovery and modeling, only a few ... [more ▼]

Activeandpassivemeasurementsfortopologydiscoveryhave known an impressive growth during the last decade. If a lot of work has been done regarding inter-domain topology discovery and modeling, only a few papers raise the question of how to extract intra-domain topologies from measurements results. In this paper, based on a large dataset collected with mrinfo, a multicast tool that silently discovers all interfaces of a router, we provide a mechanism for retrieving intra-domain topologies. The main challenge is to assign an AS number to a border router whose IP addresses are not mapped to the same AS. Our algorithm is based on probabilistic and empirical IP allocation rules. The goal of our pool of rules is to converge to a consistent router to AS mapping. We show that our router-to-AS algorithm results in a mapping in more than 99% of the cases. Furthermore, with mrinfo, point-to-point links between routers can be distinguished from multiple links attached to a switch, providing an accurate view of the collected topologies. Finally, we provide a set of large intra-domain topologies in various formats. [less ▲]

Extraction and characterisation of a dietary fibre concentrate from date pulp

Poster (2006, June)

Extraction And Characterization Of Water-Extractable And Water-Unextractable Arabinoxylans From Spelt Bran: Study Of The Hydrolysis Conditions For Monosaccharides Analysis.

in Journal of Cereal Science (2011)

Extraction and fractionation of cytotoxic metabolites from Galanthus lagodechianus Kem.-Nath

in Allergology and Immunology (Moscou) (2006), 7