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    SUPERCONDUCTIVITY IN STRONGLY CORRELATED ELECTRON SYSTEMS: ANALYTICAL APPROACHES BEYOND DYNAMICAL MEAN FIELD THEORY

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    The present thesis presents a systematic study of the possible cluster extensions of the dynamical mean field theory (DMFT). In particular, the role of the cluster geometry is investigated analytically in the relevant case of two-dimensional lattices with d-wave superconducting order

    Treatment of male infertility

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    Male factor infertility is a general term that describes a situation in which the inability to conceive is associated with an alteration identified in the male partner. This dysfunction may be associated with low sperm concentration (oligozoospermia), poor sperm motility (asthenozoospermia) or abnormal sperm morphology (teratozoosperinia); however, generally, a disturbance of all these variables, oligoasthenoteratozoospermia, is mostly frequent in male subfertility. For many andrological disorders, it is not possible to find a reasonable cause and various uncontrolled treatments have been applied to infertile men, often just on an empirical basis. More recently, after the explosive development of modem assisted reproduction techniques (ARTs), feasible with a single spermatozoon [intracytoplasmic sperm injection (ICSI)], the treatment of male infertility has received new meaning and andrologists are no longer expected to achieve a quantitative increase in sperm number but are instead asked to improve the fertility potential of the single sperm cell in order to achieve better results in both in vitro fertilization and ICSI. Additional prospective studies are needed to better understand the possible role of therapy in ART candidate patients. (c) 2005 Elsevier Inc. All rights reserved
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