An aqueous extract of Rhizophora mangle L. bark is used as raw material in pottery making in the State of Espirito Santo, Brazil. This extract presents large quantities of tannins, compounds possessing antioxidant properties. Tannin antioxidant activity, as a plant chemical defense mechanism in the process of stabilizing free radicals, has been an incentive to studies on anti-mutagenicity. The ...

Allium cepa var. agrogarum L. seedlings grown in nutrient solution were subjected to increasing concentrations of Cd2+ (0, 1, 10, 100 μM). Variation in tolerance to cadmium toxicity was studied based on chromosome aberrations, nucleoli structure and reconstruction of root tip cells, Cd accumulation and mineral metabolism, lipid peroxidation, and changes in the antioxidative defense system (SOD,...

Water resource degradation is one of mankind's greatest worries, as it causes direct and indirect damage to the associated biota. We initiated a water monitoring study in Pelotas Creek in 2003 in order to assess the mutagenic effect of the creek's waters. Allium cepa cells exposed to water samples and a chronically exposed macrophyte were analyzed, through evaluation of the mitotic index, mitot...

Onions (Allium cepa L.) are plagued by a number of bacterial pathogens including Pantoea ananatis, P. agglomerans, Burkholderia cepacia, Enterobacter cloacae, Pectobacterium carotovorum subsp. carotovorum, Xanthomonas axonopodis pv. axonopodis and several Pseudomonas spp. We developed a semi-selective medium, termed onion extract medium (OEM), to selectively and rapidly isolate bacteria pathoge...

The study was aimed to determine the gallic acid, rutin and quercetin contents yield of Narli onion genotype (Allium cepa L.,) exposed four different doses (0, 25, 50, 75, 100 mg L-1) silver nanoparticles (AgNPs)for30 days, after planting bulbs, attwo-week intervals. Quercetin, rutinand acid in leaves bulbs plants were determined.While content highest 25 L-1ofAgNPs treatment (575.0 ± 10.39 µg g...

Sister-chromatid exchanges (SCE) were studied in allium cepa L. meristematic cells at the second and third divisions after BrdUrd-substitution during just the first or during the second and third cycles, respectively. The observed SCE nonreciprocal/reciprocal ratios detected at the third division in both experiments, as well as comparison of the lowest SCE frequency observed per cycle and expre...

The fumigant toxicity of various essential oils and selected monoterpenoid components were tested against the adult German cockroach, Blattella germanica (L.) (Dictyoptera: Blattellidae). Responses varied according to plant material, concentration, and exposure time. High insecticidal activity against adult B. germanica specimens was achieved with allyl isothiocyanate (component of horseradish)...

Вивчено морфологічну будову та васкулярну анатомію квітки Alliumcepa. Виявлено нові морфологічні ознаки вертикальної зональності гінецею васкулярної анатомії квітки, які раніше не використовувались у систематиці родини Amaryllidaceae. Мікроморфологічні препарати 15 квіток Allium cepa виготовили, використовуючи стандартні методи просочення рослинного матеріалу парафіном. Описано виготовлені зріз...