162,494 research outputs found
A pilot investigation into the effect of maca supplementation on physical activity and sexual desire in sportsmen
Full text linkAIMS OF THE STUDY: Maca (Lepidium meyenii Walp) is consumed both as a sports supplement by strength and endurance athletes, and as a natural stimulant to enhance sexual drive. However, whether or not the postulated benefits of maca consumption are of scientific merit is not yet known. The aim of the study was therefore to investigate the effect of 14 days maca supplementation on endurance performance and sexual desire in trained male cyclists.
MATERIALS AND METHODS: Eight participants each completed a 40 km cycling time trial before and after 14 days supplementation with both maca extract (ME) and placebo, in a randomised cross-over design. Subjects also completed a sexual desire inventory during each visit. RESULTS: ME administration significantly improved 40 km cycling time performance compared to the baseline test (P=0.01), but not compared to the placebo trial after supplementation (P>0.05). ME administration significantly improved the self-rated sexual desire score compared to the baseline test (P=0.01), and compared to the placebo trial after supplementation (P=0.03).
CONCLUSIONS: 14 days ME supplementation improved 40 km cycling time trial performance and sexual desire in trained male cyclists. These promising results encourage long-term clinical studies involving more volunteers, to further evaluate the efficacy of ME in athletes and normal individuals and also to explore its possible mechanisms of action
The Drosophilidae of Taiwan:Ggenera Amiota (Excluding Subgenus Phortica) and Leucophenga(Nankangomyia Subg.Nov.)
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[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
Acai, cacao and maca extracts: Anticancer activity and growth inhibition of microbial triggers of selected autoimmune inflammatory diseases
No full textBackground: The consumption of high antioxidant foods has been linked with a decreased incidence of some cancers and inflammatory diseases. Some high antioxidant foods also inhibit the growth of a variety of bacterial pathogens. Despite this, the high antioxidant ‘superfoods’ acai, cacao and maca are yet to be adequately tested for anticancer activity or the ability to inhibit the growth of bacterial triggers of autoimmune inflammatory diseases. Materials and Methods: Freeze dried acai, cacao and maca powders were extracted and tested for antimicrobial activity using a modified disc diffusion assay and the MICs were determined. Inhibitory activity against CaCo2 and HeLa cancer cell lines was evaluated using colorimetric cell proliferation assays. Toxicity was evaluated using an Artemia franciscana nauplii bioassay. Results: The acai, cacao and maca extracts displayed broad spectrum antibacterial activity, inhibiting the growth of all of the bacteria screened, although generally with only low efficacy. The ethyl acetate extracts were more potent bacterial growth inhibitors than were the corresponding methanolic and aqueous extracts. The inhibitory activity of the acai and maca ethyl acetate extracts against P. mirabilis was particularly noteworthy, with MIC values 1000 μg/mL. Conclusion: These studies demonstrate that the aqueous cacao and maca extracts have appreciable inhibitory activity against some cancer cell lines and that the acai and maca ethyl acetate extracts were moderate inhibitors of the growth of bacteria associated with selected autoimmune inflammatory disorders. Furthermore, the toxicity studies indicate that they are safe for therapeutic usage. All other extracts were inactive or of low activity towards the cancer and bacterial cells.Full Tex
The zoofilic fruitfly of Phortica variegata (Drosophilidae, Steganinae): morphology, ecology and biological niche
No full textFlies belonging to the subfamily Steganinae (Drosophilidae) display unusual zoophilic feeding habits at the adult and/or larval stage. Phortica variegata (Fallén) feeds on tears or eye liquid around the eyes of humans and carnivores. When feeding it is a potential vector of Thelazia callipaeda (Railliet and Henry) eyeworms. Adult and larval stages of this fly may be easily confused with other species belonging to the same genus, and little is known on the biology and ecology of P. variegata. In April-November 2005, a total of 969 P. variegata were collected in an area with a high prevalence of canine thelaziosis. The number of flies collected weekly was then related to climatic and environmental parameters (e.g. temperature, relative humidity and total rainfall) recorded daily at the collection site. The highest number of Phortica were collected during July-August. The sex ratio (number of males : females) rose from approximately 0.5 during May-July, to approximately 3.0 in August and 181 during September-October. Distributional data, representing 242 sites at which P. variegata has been collected in Europe, were analysed using a desktop implementation of the genetic algorithm for rule-set prediction (GARP) to model ecological requirements across Europe, as well as in Italy. P. variegata is shown to be mainly active at 20-25 degrees C and 50-75% RH. The ecological niche model suggests with a high degree of confidence that large areas of Europe are likely to represent suitable habitat for this species, mostly concentrated in central Europe. The results reported here contribute basic knowledge on the ecology and geographical distribution of P. variegata flies, which will be fundamental to gaining a better understanding of their role as vectors of human and animal pathogen
Determinación de aflatoxina total y ocratoxina a en maca seca y en harina de maca
No full textIt has been determined the concentration of total aflatoxin and A ochratoxín in dried maca (Lepidium meyenii walp) and maca flour and the physicochemical and microbiological factors affecting their production. It has been collected samples from 4 productive communitíes and 4 main markets. Extrinsic factors such as temperature and relative humidity are 10°C y 52,5% in communities and 15 °C y 71% in markets which are favourable conditions for growing Fusarium avenaceum, Penicillium corylophylum, P.commune, P.chrysogenum, Aspergi1us níger, A. flavus, A.ochraceus, esclerotia, A. flavus, Rizophus and yeasts. It was also determined total aflatoxin content average (0,829 mg/kg), which indicates the good quality of dried maca and A ochratoxin content average (8,703 ppb), which exceeds the permissible maximum limit given by USL 123/2005. The factors affecting A ocratoxin production are reducing sugars and pH. Total fungi average is 50x102 cfu/g but is not a factor affecting this mycotoxin. The community samples had higher concentrations of A ochratoxin and total fungi than the market samples. In maca flour, total aflatoxin content average is 12.4528 ppb in which the toasted flour in bulk from the Central market in Lima had the highest content and the main influential factors are humidity, pH and acidity, whíle A ochratoxin content average is 2.8916ppb, in which the flour from Chupaca had the highest concentration and the main influential factors are reducing sugars and pH. On the other hand, the number of fungi in maca flour is 78 x 102 cfu/g affecting total Aflatoxin but not A ocratoxin production.Se ha determinado la concentración de aflatoxina total y ocratoxina A en la maca seca y en harina de maca (Lepidium meyenii walp), así como los factores fisicoquímicos y microbiológicos que influyen en su producción. Para ello, se ha recolectado muestras de 4 comunidades productoras y de 4 mercados principales. Los factores extrínsecos como temperatura y humedad relativa promedio son 10 °C y 52,5%, en las comunidades y 15°C y 71% en los mercados; estas condiciones hacen posible el crecimiento y desarrollo de Fusarium avenaceum,Penícillium corylophylum, P.commune, P.chrysogenum, Aspergillus níger, A.flavus, A.ochraceus, esclerotia de A. flavus, Rízophus y levaduras. Se ha determinado una concentración promedio de aflatoxina total, 0,829 ppb (Mg/kg), cifra que indica buena calidad de maca seca y la concentración promedio de ocratoxina A, 8,703 ppb, cifra que sobrepasa el límite máximo permitido por la legislación de Estados Unidos N° 123/2005. Los factores que influyen en la producción de ocratoxina A son los azúcares reductores y el pH. El promedio de hongos totales encontrado es 50 x 102 ufc/ g, y no es un factor influyente en la producción de esta micotoxina. Las muestras de comunidades tuvieron mayor cantidad de ocratoxína A y número de hongos que las muestras de los mercados. En harina de maca, el promedio de aflatoxina total es 12.453 ppb, encontrándose concentraciones altas en la harina tostada a granel del Mercado Central de Lima y los factores influyentes son humedad relativa, pH y acidez. El promedio de ocratoxina A es de 2.892 ppb, encontrándose concentraciones altas en la harina del Mercado de Chupaca, los factores influyentes son los azúcares reductores y el pH. Por otro lado, el número de hongos en harina de maca es 78 x 102 ufc/ g y es un factor influyente en la producción de aflatoxina total pero no en la producción de ocratoxina A
Algoritmo CSMA/CA y MACA
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Este laboratorio necesita de Flash Player para ser ejecutado. Adobe dejó de dar soporte a Flash Player el 31 de diciembre de 2020. Desde el 12 de enero de 2021, el contenido Flash ya no se ejecuta en los navegadores web.http://labvirtual.webs.upv.es/Algoritmo_CSMACA_y_MACA_.htmLloret Mauri, J. (2010). Algoritmo CSMA/CA y MACA. Universitat Politècnica de València. https://riunet.upv.es/handle/10251/791
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