Auxin and ethylene have been largely reported to reduce root elongation in maize primary root. However the effects of auxin are greater than those caused by ethylene. Although auxin stimulates ...ethylene biosynthesis through the specific increase of ACC synthase, the auxin inhibitory effect on root elongation is not mediated by the auxin-induced increase of ethylene production. Recently it has been demonstrated that root inhibition by the application of the synthetic auxin NAA (1-naphtalenacetic acid) is increased if combined with the ethylene precursor ACC (1-aminocyclopropane-1-carboxilic acid) when both compounds are applied at very low concentrations.
Root elongation is basically the result of two processes: a) cell divisions in the meristem where meristematic cells continuously generate new cells and b) subsequently polarized growth by elongation along the root axis as cells leave the meristem and enter the root elongation zone.
Our results indicate that exogenous auxin reduced both root elongation and epidermal cell length. In a different way, ethylene at very low concentrations only inhibited root elongation without affecting significantly epidermal cell length. However, these concentrations of ethylene increased the inhibitory effect of auxin on root elongation and cell length. Consequently the results support the hypothesis that ethylene acts synergistically with auxin in the regulation of root elongation and that inhibition by both hormones is due, at least partially, to the reduction of cell length in the epidermal layer.
Local-scale disturbances can benefit an endangered, fire-adapted plant species in Western Mediterranean heathlands in the absence of fire Paniw, Maria; Roberto Salguero-GmezauthorSchool of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, AustraliaEvolutionary Demography Laboratory, Max Planck Institute for Demographic Research, GermanyDepartment of Zoology, Trinity College Dublin, Dublin 2, Ireland; Fernando OjedaauthorDepartamento de Biologa - ceiA3, Universidad de Cdiz, Campus Ro San Pedro, 11510 Puerto Real, Spain
2015
Journal Article
El presente proyecto es una propuesta innovadora de solución para reducir la contaminación ambiental ocasionada por el desecho de las bolsas plásticas de uno solo uso. Con la finalidad, de validar la ...viabilidad del proyecto se realizó una investigación en fuentes secundarias y primarias donde se identificó en el Perú se consume 3000 millones de bolsas plásticas al año que producen 1 tonelada de CO2 ocasionado problemas de salud y contaminación ambiental. ;
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En este sentido, el proyecto propone la creación, fabricación y comercialización de bolsas reutilizables de uso multifuncional, que estarán a la venta en los supermercados y en el canal online. Por consiguiente, los productos están orientados a satisfacer las necesidades del segmento de usuarias que son mujeres 25 a 55 años de edad del NSE A, B y C1 que representan el tamaño de mercado total de 810,973 personas en Lima Metropolitana. ;
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Cabe indicar, que el proyecto promete un ingreso anual de S/. 1,028,611 soles en el primer año de operaciones con un crecimiento anual en ventas de 4% a 4.5% para los años siguientes. ;
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Por lo tanto, el proyecto es viable y rentable porque el valor actual neto del flujo de caja financiero es S/. 232,043 soles, que es la rentabilidad en unidades monetarias que el proyecto genera para los accionistas y rinde una tasa interna de retorno de 52% mayor al costo de oportunidad del capital.
This project proposes an innovative solution to reduce the environmental pollution caused by single-use plastic bag waste. In order to validate the viability of this project, a study using secondary and primary sources was completed which demonstrated that each year Peru uses 3000 million plastic bags which produces 1 ton of CO2 causing health problems and environmental pollution. ;
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Following this, our project proposes the creation, manufacturing and commercialization of reusable and multiuse bags, which will be for sale in supermarkets and online. Our products will be orientated towards satisfying the needs of a segment of users; which are women between 25 to 55 years old in socio-economic levels A, B and C1, which represents a total market size of 810,973 people in Metropolitan Lima. ;
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It should be noted that the project promises an annual income of S /. 1,028,611 soles in the first year of operations with annual sales growth of 4% to 4.5% for the following years. ;
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Therefore, the project is viable and profitable because the net present value of the financial cash flow is S /. 232,043 soles, which is the return on monetary units that the project generates for shareholders and yields an internal rate of return of 52% higher than the opportunity cost of capital.
Trabajo de investigación
A patient with two seborrhoeic keratoses in the face received a single daily application of dobesilate cream during 6 months. Dobesilate achieved complete clearance of the seborrhoeic keratosis ...lesions with good cosmoses, suggesting that this compound is a safe and efficient candidate in the treatment of seborrhoeic keratoses.
Pseudoverrucous papules and nodules (PPN) is an uncommon complication, mainly reported in the diaper area. It is thought to be a manifestation of chronic irritant contact dermatitis that develops as ...a result of prolonged exposure to liquid stool and/or urine. We report a case of a peristomal PPN with a histolopathology simulating a nutritional deficiency dermatitis.
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