Serial passage of axenically-cultured Leishmania chagasi promastigotes results in a progressive diminution in resistance to complement mediated lysis (CML), whereas high CML resistance is seen in infectious metacyclic promastigotes from the sandfly vector as well as metacyclic-like promastigotes within low passage cultures at stationary growth phase. As previously reported [94], in a screen see...

A modified infection and maintenance procedure for the cyclical transmission of T. (T.) brucei in Glossina m. morsitans is described which produced high mature infection rates in the flies. Freshly extruded metacyclic forms and bloodstream forms were serologically typed, using the indirect fluorescent antibody test (IFAT) and the neutralization infectivity test (NIT). Metacyclic forms of a cert...

in this paper, we compute the number of fuzzy subgroups of some classes of non-abeilan groups. explicit formulas are givenfor dihedral groups $d_{2n}$, quasi-dihedral groups $qd_{2^n}$, generalized quaternion groups $q_{4n}$ and modular $p$-groups $m_{p^n}$.

in this paper we find systems of subgroups of a finite‎ ‎group‎, ‎which $bbb p$-subnormality guarantees supersolvability‎ ‎of the whole group‎.

Penetration of Trypanosoma cruzi into mammalian cells depends on the activation of the parasite's protein tyrosine kinase and on the increase in cytosolic Ca2+ concentration. We used metacyclic trypomastigotes, the T. cruzi developmental forms that initiate infection in mammalian hosts, to investigate the association of these two events and to identify the various components of the parasite sig...

To identify parameters of Leishmania infection within a population of infected sand flies that reliably predict subsequent transmission to the mammalian host, we sampled groups of infected flies and compared infection intensity and degree of metacyclogenesis with the frequency of transmission. The percentage of parasites within the midgut that were metacyclic promastigotes had the highest corre...

Acquisition of the variable antigen-containing surface coat of Trypanosoma brucei occurs at the metacyclic stage in the salivary glands of the tsetse fly vector. The differentiation of the metacyclic trypanosome in the gland has been studied by scanning electron microscopy and by transmission electron microscopy of thin sections and freeze-fracture replicas. The uncoated epimastigote trypanosom...

We determine completely the primes p for which the Farrell-Tate cohomology of the mapping class group Tg is /»-periodic. We also estimate the p-period of a p-periodic T„ . For T any group of finite virtual cohomological dimension (vcd) and a prime p, we say that the group Y has p-periodic cohomology if there exists a positive integer d such that the Farrell-Tate cohomology groups //'(r; M) and ...

A Cayley digraph G = C(Γ, X) for a group Γ and a generating set X is the digraph with vertex set V (G) = Γ and arcs (g, gx) where g ∈ Γ and x ∈ X. The reverse of C(Γ, X) is the Cayley digraph G−1 = C(Γ, X−1) where X−1 = {x−1;x ∈ X}. We are interested in sufficient conditions for a Cayley digraph not to be isomorphic to its reverse and focus on Cayley digraphs of metacyclic groups with small gen...