[Porphyrin metabolic disorders in the genesis of fetoplacental insufficiency in hyperandrogenism].

The association of a ratio of blood porphyrin fraction concentrations in pregnant women with hyperandrogenism (HA) with the osmoresistance of red blood cells and the microviscosity of their membranes was studied. A cohort examination was made in parallel groups of 64 pregnant women aged 20 to 30 years at 28-36 weeks gestation. The levels of dehydroepiandrosterone sulfate (DHEAS) and testosterone were measured.

[Laparoscopic heminephrouretherectomy in children with double kidney].

The article revises the first experienced of laparoscopic geminephrouretherectomy in our country. 5 children aged 3-14 years were operated on. In 1 case of double ureter the laparoscopic ureterectomy was performed, the rest 4 patients experienced geminephrouretherectomy (2 left and 2 right).

[Treatment of urethral fistulas in children with application of allogenic fibroblasts].

The study was aimed at upgrading the results of conservative treatment of children with urethral fistulas using methods of tissue engineering. A total of 126 operations for closure of urethral fistulas (UF) were made from 1986 to 2007. The patients were divided into four groups.

[Studying recombination in heterozygous tandem duplications in Escherichia coli].

Our previous data showed that the principal pathway of the formation of selected recombinants in Escherichia coli strains carrying heterozygous tandem duplications is unequal crossing over between sister chromosomes. Data presented in this work showed that when DNA homology is not disturbed (due to transposon insertion), intragenic recombinants can occur directly in the region of recombination through intrachromomal exchange as well.