in vitro maturation (ivm) was carried out in the presence of different concentrations (10, 50, 100 or 200 µm) of α-linolenic acid (ala). embryonic cleavage, blastocyst formation following parthenogenetic activation (pa) and in vitro fertilization (ivf), and numbers of total and apoptotic cells in blastocyst were then determine for the 50 μm concentration and compared with the control group. out...

VanRS two-component regulatory systems are key elements required for the transcriptional activation of inducible vancomycin resistance genes in bacteria, but the precise nature of the ligand signal that activates these systems has remained undefined. Using the resistance system in Streptomyces coelicolor as a model, we have undertaken a series of in vivo studies which indicate that the VanS sen...

Using a fluorometric HPLC method, we determined delta-aminolevulinic acid (ALA) in sera and urine samples from 16 lead workers with blood lead levels ranging from 19 to 107 microG/100 ml. The concentration of ALA in serum correlated highly with the urinary ALA concentration (gamma = 0.957 for ALA mg/1; gamma = 0.967 for ALA mg/g creatinine). The ALA concentrations in the serum of lead workers r...

background neuropathy is one of the most complications of diabetes that may be associated with changes in the structure and function of the basement membranes in nerves. laminin is one of the most important components of basement membranes in sciatic nerve. objectives in this study, the protective effects of alpha lipoic acid (ala) as an antioxidant agent on blood glucose level, body weight and...

The use of endogenous protoporphyrin IX generated after administration of 5-aminolaevulinic acid (ALA) has led to many applications in photodynamic therapy (PDT). However, the bioavailability of ALA is limited by its hydrophilic properties and limited cell uptake. A promising approach to optimize the efficacy of ALA-PDT is to deliver ALA in the form of prodrugs to mask its hydrophilic nature. T...

background:   objective: the aim of this study was to evaluate the in vitro developmental competence of mouse vitrified pre-antral follicles in comparison to isolated pre-antral follicles derived from vitrified ovaries in the presence of alpha lipoic acid (ala).   materials and methods: pre-antral follicles derived from fresh, vitrified-warmed ovarian tissues and vitrified–warmed pre-antral fol...

Bacteria with either intrinsic or inducible resistance to vancomycin make peptidoglycan (PG) precursors of lowered affinity for the antibiotic by switching the PG-D-Ala-D-Ala termini that are the antibiotic-binding target to either PG-D-Ala-D-lactate or PG-D-Ala-D-Ser as a consequence of altered specificity of the D-Ala-D-X ligases in the cell wall biosynthetic pathway. The VanA ligase of vanco...

Background and aimsEarly revascularization -the gold standard therapy for ischemic stroke- is often withheld in the elderly population due to high risk of complications. Thus, safe effective preventive therapeutic options are needed. The plant-derived omega-3-fatty-acid alpha-linolenic-acid (ALA) has emerged as a novel cardiovascular-protective agent. As yet, little known about its potential ef...

The following sequences of amino acids surrounding the three sulfhydryl groups of the Escherichia coli tryptophan synthetase A protein were established: Sequence I, Gly-IleAsp-Glu-Phe-Tyr-Ala-Gln-Cys-Glu-Lys-Val-Gly-ValAsp-Ser-Val-Leu-Val-Ala-Asp-Val-Gln-Glu-Ser-Ala-ProPhe-Arg; Sequence II, Arg-Ala-Phe-Ala-Ala-Gly-Val-ThrPro-Ala-Gln-Cys-Phe-Glu-Met-Leu-Ala-Leu-Ile-Arg; Sequence III, Arg-His-Asn...