Abstract:
los contenidos de cd y pb de los tejidos blandos de los mejillones de mangle mytella strigata colectados en 1996, en seis lagunas costeras del noroeste de méxico variaron entre 0.73 y 1.9 μg g-l y entre 8.3 y 17.1 μg g-l, respectivamente; los valores de ddd variaron entre 4.5 y 119 ng g-l los de dde desde menos del límite de detección (

Abstract:
two new streptomyces phages, ？bp1 and ？bp2, were isolated from tropical soil samples. these phages presented a large host range and developed both lytic and lysogenic responses in different streptomyces species tested. variations in the incubation temperature showed to be important in the development of the replication cycle. increasing incubation temperature from 30oc to 42oc induced the lytic response of ？bp2 and lysogenic of ？bp1 in the host strain streptomyces sp. wl6. ？bp1 and ？bp2 have icosahedral heads with long tails and were characterized in relation to morphology, g + c content, genome size and adsorption curve

Abstract:
Two new Streptomyces phages, BP1 and BP2, were isolated from tropical soil samples. These phages presented a large host range and developed both lytic and lysogenic responses in different Streptomyces species tested. Variations in the incubation temperature showed to be important in the development of the replication cycle. Increasing incubation temperature from 30oC to 42oC induced the lytic response of BP2 and lysogenic of BP1 in the host strain Streptomyces sp. WL6. BP1 and BP2 have icosahedral heads with long tails and were characterized in relation to morphology, G + C content, genome size and adsorption curve

Abstract:
In this article we prove that stratified spaces and other geometric subfamilies satisfy categorical Fra\"iss\'e properties, a matter that might be of interest for both geometers and logicians. As a motivation we show a new example of a stratified pseudomanifold that satisfies the finite oscillation property with respect to a smooth stratified action. Part of this work was presented by the authors at the First Meeting of Logic and Geometry in Bogot\'a, on Sept. 2010.

Abstract:
In this article we study some interesting properties of the $q$-Analog singular homology, which is a generalization of the usual singular homology, suitably adapted to the context of $N$-complex and amplitude homology \cite{kapranov}. We calculate the $q$-Analog singular homology of a convex space. Although it is a local matter; this is an important step in order to understand the presheaf of $q$-chains and its algebraic properties. Our result is consistent with those of Dubois-Viol\`ette & Henneaux \cite{dubois3}. Some of these results were presented for the XVIII Congreso Colombiano de Matem\'aticas in Bucaramanga, 2011.

Abstract:
This article is devoted to the study of smooth desingularization, which are customary employed in the definition of De Rham Intersection Cohomology with differential forms. In this paper we work with the category of Thom-Mather simple spaces. We construct a functor which sends each Thom-Mather simple space into a smooth manifold called its primary unfolding. Hence we prove that the primary unfoldings are unique up Thom-Mather isomorphisms.

Abstract:
In this paper we introduce a new topological Ramsey space whose elements are infinite ordered polyhedra. Then, we show as an application that the set of finite polyhedra satisfies two types of Ramsey property: one, when viewed as a category over $\mathbb N$; the other, when considered as a class of finite structures. The (ordered) random polyhedron is the Fraisse limit of the class of finite ordered polyhedra; we prove that its group of automorphisms is extremely amenable. Finally, we present a countably infinite family of topological Ramsey subspaces; each one determines a class of finite ordered structures which turns out to be a Ramsey class. One of these subspaces is Ellentuck's space; another one is associated to the class of finite ordered graphs whose Fraisse limit is the random graph. The Fraisse limits of these classes are not pairwise isomorphic as countable structures and none of them is isomorphic to the random polyhedron.

Abstract:
In this article we give an equivariant version for the construction of generic models on presheaves of structures. We deal with first order structures endowed with a suitable action of some fixed group, say $G$; we call them $G$-structures. We show that every exact presheaf of $G$-structures $\mc{M}$ has a generic $G$-model $\mc{M}\sup{gen}$. Moreover, $\mc{M}$ induces a presheaf of orbit structures $\mc{M}/G$ and a generic orbit model $(\mc{M}/G)\sup{gen}\cong \mc{M}\sup{gen}/G$ which coincides with the orbit structure of the generic $G$-model.

Abstract:
this work shows results obtained by employing the linguistic method to identify biologically meaningful sites in actinomycetes 5s rrnas. the approach adopted identifies triplet-words, along the base sequence of 5s rrna, located mainly at the alpha and beta domains of the 5s secondary structure. there are triplet-words representing universal protein binding sites that include important prokaryote signatures, and sites strategically located in critical regions related to the formation of the 5s ribonucleoproteins (rnp) complex. in those sites, where the gc pressure promoted substitutions, the analysis demonstrates that alterations did not affect their biological significance. sites formed by ggy (or more rarely ggr), continued to play an important role as ribosomal proteins rpl18 and rpl5 protein receptors. the data suggest that instead of increasing the molecular variability, expected for the diversity in species and habitats occupied for the group, gc pressure functioned as a reducer mechanism for the inter-specific diversity.

Abstract:
A classical result says that a free action of the circle $\Bbb{S}^1$ on a topological space $X$ is geometrically classified by the orbit space $B$ and by a cohomological class ${H}^{^{2}}{(B,\Bbb{Z})}$, the Euler class. When the action is not free we have a difficult open question: $\Pi$ : "Is the space $X$ determined by the orbit space $B$ and the Euler class?" The main result of this work is a step towards the understanding of the above question in the category of unfolded pseudomanifolds. We prove that the orbit space $B$ and the Euler class determine: * the intersection cohomology of $X$, * the real homotopy type of $X$.