Abstract Surrogate motherhood, pregnancy by substitution or the surrogacy, among others, are some of the terms used in discussions of this topic and which first documented case took place in Michigan (USA) in 1976. This article is based on different concepts related to surrogate motherhood (SM), three films are analyzed from different point of view, Femmes ou maitresses (2001) by J.M. Pallardy, Comme les autres(2008) by V. Garent and Melody(2014), by B. Bellefroid, and eventually, the relationship between female poverty and surrogate motherhood is considered.

Resumen La maternidad subrogada, la gestación por sustitución o los vientres de alquiler, entre otros, son algunos de los términos empleados en debates de creciente actualidad y cuyo primer caso documentado tuvo lugar en Michigan (EEUU) en 1976. En el presente artículo se parte de diferentes conceptos asociados a la maternidad subrogada (MS), se analizan desde diferentes perspectivas las películas Femmes ou maîtresses (2001) de J.M. Pallardy, Como los demás (2008) de V. Garent y Melody (2014) de B. Bellefroid y, finalmente, se considera la relación entre la maternidad subrogada y la pobreza femenina.

Oligonucleotides have a wide range of applications in fields such as biotechnology, molecular biology, diagnosis and therapy. However, the spectrum of uses can be broadened by introducing chemical modifications into their structures. The most prolific field in the search for new oligonucleotide analogs is the antisense strategy, where chemical modifications confer appropriate characteristics such as hybridization, resistance to nucleases, cellular uptake, selectivity and, basically, good pharmacokinetic and pharmacodynamic properties. Combinatorial technology is another research area where oligonucleotides and their analogs are extensively employed. Aptamers, new catalytic ribozymes and deoxyribozymes are RNA or DNA molecules individualized from a randomly synthesized library on the basis of a particular property. They are identified by repeated cycles of selection and amplification, using PCR technologies. Modified nucleotides can be introduced either during the amplification procedure or after selection.