Complementary DNA cloning of complement C8 beta and its sequence homology to C9.

The complete amino acid sequence of mature C8 beta has been derived from the DNA sequence of a cDNA clone identified by expression screening of a human liver cDNA library. Comparison with the amino acid sequence of C9 shows an overall homology with few deletions and insertions. In particular, the cysteine-rich domains and membrane-inserting regions of C9 are well conserved. These findings are discussed in relation to a possible mechanism of membrane attack complex formation

Ultraestrutura da espermatogênese do tamoatá, Hoplosternum littorale (Hancock) (Teleostei, Callichthyidae) do rio Amazonas Ultrastructure of the spermatogenesis of the fish, Hoplosternum littorale (Hancock) (Teleostei, Callichthyidae) of the Amazon river

<abstract language="eng">Sequential cytological modifications of Hoplosternum littorale (Hancock) spermatogenesis were studied with electron microscopy from the spermatocyte to the mature spermatozoon. Five stages of spermatical maturation were described. The spermatozoon is one of the primitive tupe, with head without acrosome and a tail with a type pattern

The Emergence of Ontogenic Scaffolding in a Stochastic Development Environment

Evolutionary designs based upon Artificial Ontogenies are beginning to cross from virtual to real environments. In such systems the evolved genotype is an indirect, procedural representation of the final structure. To date, most Artificial Ontogenies have relied upon an error-free development process to generate their phenotypic structure

Effect of starvation on Fos and neuropeptide immunoreactivities in the brain and pituitary gland of Xenopus laevis

Contains fulltext : 35899.pdf (preprint version ) (Open Access

Approaching Models of Nursing from a Postmodernist Perspective

This paper explores some questions about the use of models of nursing. These questions make various assumptions about the nature of models of nursing, in general and in particular. Underlying these assumptions are various philosophical positions which are explored through an introduction to postmodernist approaches in philosophical criticism. To illustrate these approaches, a critique of the Roper et al. model is developed, and more general attitudes towards models of nursing are examined. It is suggested that postmodernism offers a challenge to many of the assumptions implicit in models of nursing, and that a greater awareness of these assumptions should lead to nursing care being better informed where such models are in use