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Search Results: 1 - 10 of 112038 matches for " O. Rossetto "
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An Engineer’s View of Hair Cell Function: A Theory of Capacitive Transduction  [PDF]
Michelangelo Rossetto
Natural Science (NS) , 2015, DOI: 10.4236/ns.2015.73018
Abstract: Using an engineering perspective which is looking at the hair cells cilia as a total entity interacting with its neighboring cilia along their entire length, a theory of capacitive transduction is developed. This larger scaled view of cilia interaction suggests that transduction may be achieved through a mechanically controlled variable capacitor in the cilia bundle. A brief review of some seldom considered facts about electrical capacitors supports the hypothesis presented. Experimental measurements of hair cell reversal potential and ionic conditions surrounding the cilia during transduction, long reported in the biophysical literature, also support a capacitive hypothesis of transduction.
Bistability in Ephaptic Coupling as a Possible Memory Element Explored through a Colloid Interptation of Stereocilia Bistability  [PDF]
Michelangelo Rossetto
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2015, DOI: 10.4236/jemaa.2015.73012
Abstract: When the processes of neurons are in close proximity they effectively couple to each other in a process termed Ephaptic coupling. This coupling occurs without the membranes touching when the space between them is some tens of nanometers. If the intra-membrane spacing has a mechanical bistability, which moves the membranes closer and further apart, the Ephaptic coupling will be turned on and off allowing one neuron to read, or not read the content of the other. This paper explores the possibilities of bistable ephaptic memory element by a study of an analogous system that operates at a much larger scale, the Stereocilia of the hair cell. Published measurement of hair cell Stereocilia force/displacement function shows both a negative slope region in the displacement function and tendency to express bistability. We show here how this negative slope region can arise through the exigency of colloid forces. An explanation of Colloid Theory, presented in a graphic form, shows how a colloid force function can be modified to match the measured hair cell cilia force function. The colloid force function is modified by a limiting function resulting from Stereocilia side links, structural details that tie together the hair cell Stereocilia clusters. Understanding how a limited, simple behavior such as Stereocilia bistability functions may point to a more general understanding of how bistability may underlie other areas of living organisms such as memory and computation.
The Apple and the Ear, Grasping Sounds in Space—A Theory of Sound Localization  [PDF]
Michelangelo Rossetto
Natural Science (NS) , 2018, DOI: 10.4236/ns.2018.1011040
Abstract: Sensing the direction of origin of a sound in space has long been attributed to the delay between arrival times between the two ears. This, now discredited two dimensional theory, was put to rest by the observation that a person deaf in one ear can locate sounds in three dimensional space. We present here a new theory of sound localization that has the re-quired three dimensional measurement. It is a theory that interprets the well researched biological structure of the mammalian cochlea in a new and logical way, which leads to a deeper understanding of how sound localization functions.
época de colheita e desenvolvimento vegetativo de aveia preta
Rossetto, Claudia Antonia Vieira;Nakagawa, Jo?o;
Scientia Agricola , 2001, DOI: 10.1590/S0103-90162001000400013
Abstract: in spite of the fact that black oat presents important traits of agronomic interest, studies addressed to productivity are still in small number for brazilian conditions. one experiment was carried under field conditions, at botucatu, sp, brazil, to study the plant development of avena strigosa schreb cv. comum, grown on a rhodic nitisol. the experiments followed a completely randomized block design with three replications. the treatments consisted of weekly harvests, starting 21 days after sowing. plant characteristics were evaluated at each harvesting time. the highest development of plant was observed at 84 days after sowing, when the panicle emergence started. there was a higher contribution of primary tillers in relation to secondary for the vegetative development and yield components.
Productions of dry matter of oat plants / Acúmulo de matéria seca de plantas de aveia preta
Claudia Antonia Vieira Rossetto,Jo?o Nakagawa
Semina : Ciências Agrárias , 2000,
Abstract: Three experiments were carried out in Botucatu, State of S o Paulo, Brazil, to study the productions of dry matter of oat plants, cv. Comum, with sowing densities. The soil was a Terra Roxa Estruturada and Solo Litólito. The experimental design was a completely randomized blocks with three replication. The collection studied were eight, seven and six, starting at 21 days after emergence of seedlings (DAE). The evaluations were done at collection. The yield productions of dry matter of plants of the three experiments were observed at 126 DAE. The climatic conditions of each year had effects on productions of dry matter of plants. Stems were the main component of the total dry matter. O objetivo do presente trabalho foi avaliar o acúmulo de matéria seca de plantas de aveia preta, cultivar Comum, sob diferentes condi es ambientais, em Botucatu-SP. O delineamento experimental utilizado foi inteiramente casualizado, com três repeti es. Os tratamentos constaram de épocas de coletas de plantas, iniciadas aos 21 dias após a emergência das plantulas (DAE), com intervalos de 21 dias. Por ocasi o da coleta, para cada experimento, foram realizadas as determina es do peso das raízes, dos colmos, dos limbos e das bainhas das folhas, das raques das panículas, das sementes do colmo principal e dos perfilhos primários e secundários, e do peso da matéria seca total, todos em g/m2. As coletas de plantas de aveia preta realizadas aos 126 DAE favorecem maior acúmulo de matéria seca, nos três experimentos realizados. As condi es ambientais interferem na época de colheita, afetando a produ o de matéria seca das plantas. A maior contribui o no acúmulo de matéria seca total das plantas de aveia preta é proporcionada pelos colmos.
época de colheita e desenvolvimento vegetativo de aveia preta
Rossetto Claudia Antonia Vieira,Nakagawa Jo?o
Scientia Agricola , 2001,
Abstract: Embora a aveia preta apresente importantes características de interesse agron mico, os estudos direcionados ao conhecimento da planta visando aumentos de produtividade s o ainda em pequeno número em condi es brasileiras. Este trabalho teve por objetivo avaliar o desenvolvimento de plantas de aveia preta, cultivar Comum. O experimento foi instalado no mês de maio, em condi es de campo, em Nitossolo Vermelho, em Botucatu, SP. O delineamento experimental empregado foi inteiramente casualizado, com três repeti es. Os tratamentos constaram de épocas de coletas de plantas, as quais foram iniciadas aos 21 dias após a emergência das plantulas (DAE). O maior desenvolvimento vegetativo das plantas, considerando-se o número total de perfilhos e o número total de folhas, foi observado na fase de emiss o da panícula, aos 84 DAE. A contribui o dos perfilhos primários foi maior que a dos perfilhos secundários, tanto nos componentes vegetativos como nos componentes relacionados à produ o de sementes.
Ocorrência de adultos de Heilipus catagraphus Germar, 1824 (coleoptera: curculionidae) danificando frutos de abacateiro
Louren??o, Andre Luiz;Rossetto, Carlos Jorge;Soares, Nilberto Bernardo;
Bragantia , 1984, DOI: 10.1590/S0006-87051984000100022
Abstract: during december, 1982, adults of heilipus catagraphus were observed damaging young avocado fruits in a commercial orchard in bar?o geraldo district campinas, state of s?o paulo, brazil. the adults were eating the epicarp and the pulp of the fruits without damaging the seed. the larva of this species was already known in brazil as borer of plants of the families lauraceae and anonaceae.
Resistência de soja a insetos: IX. Amostragem para avalia??o de dano de percevejo
Nagai, Violeta;Rossetto, Carlos Jorge;Louren??o, André Luiz;
Bragantia , 1987, DOI: 10.1590/S0006-87051987000200016
Abstract: two ways of estimating the damage done by stink bugs to the soybean pods were compared: the direct counting of flat loculi (fl), which gives a percentage of damage and an index called percentual index of pod damage (pipd). the pipd is obtained by classifying the pods in three categories (flat, intermediate and sound) and applying the formula pipd = 1/2 (percentage of intermediate pods) + percentage of flat pods. the fl and pipd are highly correlated (r > 0.96). the use of the pipd is recommended since it is easier to obtain. three ways of sampling were compared: a) twenty pods from five plants; b) ten pods from ten plants; c) five pods from twenty plants. it was demonstrated that it is more advantageous to use less pods per plant and more plants per plot.
Queda dos frutos do caquizeiro, associada à infesta??o de Aceria diospyri K. (Acarina, Eriophyidae)
Rossetto, C. J.;Ojima, M.;Rigitano, O.;Igue, T.;
Bragantia , 1971, DOI: 10.1590/S0006-87051971000100001
Abstract: early fall of persimmon (diospyrus kaki l.) fruits, of the fuyu variety, is an important problem in s?o paulo state and seems to be partially related to a heavy infestation of the mite aceria diospyri k. (acarina: eriophyidae) which lives under the fruit buttons. the r?le of the mite in the fruit fall was investigated through its control using sevin 85 pm. three spraying with monthly interval, beginning after petal fall, at the dosage of 2g/l, produced an absolute control of the mites and increased the fruit setting of the fuyu variety by 16%, 10% and 25% in the 1967/68, 1968/69 and 1969/70 crop season, respectively.
An Integrated Circuit for Signal Processing of the AMS RICH Photmultipliers Tubes
A. Barrau,L. Gallin-Martel,J. Pouxe,O. Rossetto
Physics , 1998, DOI: 10.1103/PhysRevSTAB.1.030101
Abstract: An analog integrated circuit has been designed, in a BiCMOS 0.8 micron technology, for the feasability study of the signal processing of the AMS RICH photomultiplier tubes. This low power, three channel gated integrator includes its own gate and no external analog delay is requiered. It processes PMT pulses over a dynamic range of more than 100. A logic output that indicates whether the analog charge has to be considered is provided. This gated integrator is used with a compact DSP based acquisition system in a 132 channels RICH prototype. The charge calibration of each channel is carried out using a LED. The pedestal measurement is performed on activation of a dedicated input. The noise contribution study of the input RC network and amplifiers is presented.
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