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Search Results: 1 - 10 of 6976 matches for " Nelson Fukumoto "
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The use of N-alkanes to estimate intake and digestibility of coastcross-1 and Arachis pintoi mixed pasture Uso de N-alcanos para estimar o consumo e a digestibilidade da pastagem de coastcross-1 consorciada com "Arachis pintoi"
Wagner Paris,Ulysses Cecato,Nelson Fukumoto,Julio Cesar Damasceno
Revista Brasileira de Saúde e Produ??o Animal , 2009,
Abstract: The trial was carried out to evaluate the alkanes (C27 to C35) profile, dry matter intake and digestibility of Coastcross-1 and Arachis pintoi mixed pasture with or without nitrogen fertilization in two periods (December/2003 and April/2004). The treatments evaluated were: CA0 = Coastcross + Arachis pintoi without N; CA100 = Coastcross + Arachis pintoi with 100 kg of N; CA200 = Coastcross + Arachis pintoi with 200 kg of N and C200 = Coastcross with 200 kg of N. The experimental period was composed by 8 days, with 3 days for marker administration (C32 in cellulose pelets) and 5 days for fecal collection, directly from animal rectum. Sixteen animals were used and maintained on grazed area since June 2003. From December to April, for pasture constituents, there was predominance of n-alkanes with odd chain, mainly for those with higher length chain (C29, C31 and C33), excepting leaves blade of Coastcross that presented the C27 alkane in higher concentration than C33. The highest amounts of n-alkanes C31 and C33 occurred during December. Animal’s intake and DMD did not present differences (P>0.05). The values of DMD using n-alkanes were similar to in vitro DMD of leaves blade from Coastcross. O experimento foi realizado com o objetivo de determinar o perfil dos alcanos (C27 a C35), o consumo e a digestibilidade da matéria seca do pasto de Coastcross-1 consorciada com Arachis pintoi com e sem aduba o nitrogenada em dois períodos (dezembro/2003 e abril/2004). Os tratamentos avaliados foram: CA0 = Coastcross + Arachis pintoi sem N; CA100 = Coastcross + Arachis pintoi com 100 Kg de N; CA200 = Coastcross + Arachis pintoi com 200 kg de N e C200 = Coastcross com 200 kg de N. O período experimental foi de 8 dias, 3 dias para o indicador administrado (C32 em peletes de celulose) e 5 dias de coleta de fezes, diretamente no reto do animal. Utilizou-se um delineamento em blocos ao acaso com duas repeti es. Foram utilizadas 16 novilhas cruzadas. Nos períodos de dezembro e abril, para os constituintes do pasto, houve predomínio dos n-alcanos de cadeia ímpar, principalmente para aqueles de maior comprimento de cadeia (C29, C31 e C33), exce o para as laminas foliares da Coastcross que apresentou o alcano C27 em maior concentra o do que o C33. As maiores quantidades de n-alcanos C31 e C33 ocorreram no mês de dezembro. O consumo dos animais e a digestibilidade do pasto n o apresentaram diferen as (P>0,05). Os valores dos CDMS, com utiliza o dos n-alcanos, foram semelhantes aos CDMS in vitro das laminas foliares da Coastcross
The role of proboscis of the malaria vector mosquito Anopheles stephensi in host-seeking behavior
Emi Maekawa, Hiroka Aonuma, Bryce Nelson, Aya Yoshimura, Fumio Tokunaga, Shinya Fukumoto, Hirotaka Kanuka
Parasites & Vectors , 2011, DOI: 10.1186/1756-3305-4-10
Abstract: Here, using an automated device able to quantify CO2-activated thermo (35°C)-sensing behavior of the malaria vector Anopheles stephensi, we uncovered that the protruding proboscis of mosquitoes contributes unexpectedly to host identification from a distance. Ablation experiments indicated that not only antennae and maxillary palps, but also proboscis were required for the identification of pseudo-thermo targets. Furthermore, the function of the proboscis during this behavior can be segregated from CO2 detection required to evoke mosquito activation, suggesting that the proboscis of mosquitoes divide the proboscis into a "thermo-antenna" in addition to a "thermo-probe".Our findings support an emerging view with a possible role of proboscis as important equipment during host-seeking, and give us an insight into how these appendages likely evolved from a common origin in order to function as antenna organs.Mosquitoes transmit pathogens of diseases such as malaria, filariasis, yellow fever, and dengue fever. Malaria, killing nearly one million people annually [1], is caused by infection with parasites of the genus Plasmodium that is transmitted by female anopheline mosquitoes. Anopheles stephensi mosquitoes are the leading vector of malaria in India, parts of Asia and the Middle East. Despite these control efforts using mosquito nets [2], repellents [3], and insecticide [4,5], malaria remains a leading cause of worldwide morbidity and mortality [1,6]. The rate of contact between vertebrate hosts and mosquito Anopheles vectors has long been recognized as a crucial determinant of malaria transmission [7-9], and successful malaria control depends on understanding the interactions between mosquitoes and humans [10-13]. In order for transmission to occur, however, a female mosquito must be able to find potential hosts. In general, it is known that mosquitoes are remarkable for their ability to locate blood meal using human body emanations such as CO2, lactic acid, 1-octen-3-
Influencia asiática en las Américas: chinos y japoneses en América del Sur
Mary Fukumoto
Anthropologica , 1994,
Two-Triplet-Dimer Excitation Spectra in the Shastry-Sutherland Model for SrCu_2(BO_3)_2
Yoshiyuki Fukumoto
Physics , 2000, DOI: 10.1143/JPSJ.69.2755
Abstract: By using the perturbation expansion up to the fifth order, we study the two-triplet-dimer excitation spectra in the Shastry-Sutherland model, where the localized nature of a triplet-dimer, the propagation of a triplet-dimer pair by the correlated hopping and the long-range interactions between triplet-dimers play an essential role. It is found that the dispersion relations for first-neighbor triplet-dimer pair excitations with S=1 and p-type symmetry qualitatively explain the second-lowest branch observed in the neutron inelastic scattering experiment. It is also predicted that the second-lowest branch consists of two components, p_x- and p_y-states, with slightly different excitation energies. The origin of the singlet mode at 3.7meV observed in the Raman scattering experiment is also discussed.
Magnetization Plateaus in the Shastry-Sutherland Model for SrCu_2(BO_3)_2: Results of Fourth-Order Perturbation Expansion with a Low-Density Approximation
Yoshiyuki Fukumoto
Physics , 2000, DOI: 10.1143/JPSJ.70.1397
Abstract: Magnetization plateaus in the Shastry-Sutherland model for ${\rm SrCu_2(BO_3)_2}$ are studied by the perturbation expansion method. The fourth-order effective Hamiltonian which describes the dynamics of triplet dimers (TD's) with $S^{\rm tot}_z=1$ in the singlet sea is derived and then partially diagonalized for the space that consists of the TD configurations with the lowest second-order energy. The fourth-order terms are treated within a low-density approximation. Our procedure makes clear how TD interactions are responsible for the formation of magnetization plateaus. Particularly, the 1/4-plateau is obtained by the fourth-neighbor TD repulsion in the fourth-order perturbation, and a diagonal stripe arrangement of TD's appears at this plateau.
Cobordism category of plumbed 3-manifolds and intersection product structures
Yoshihiro Fukumoto
Mathematics , 2009,
Abstract: In this paper, we introduce a category of graded commutative rings with certain algebraic morphisms, to investigate the cobordism category of plumbed 3-manifolds. In particular, we define a non-associative distributive algebra that gives necessary conditions for an abstract morphism between the homologies of two plumbed 3-manifolds to be realized geometrically by a cobordism. Here we also consider the homology cobordism monoid, and give a necessary condition using w-invariants for the homology 3-spheres to belong to the inertia group associated to some homology 3-spheres.
Invariance of Finiteness of K-area under Surgery
Yoshiyasu Fukumoto
Mathematics , 2013,
Abstract: K-area is an invariant for Riemannian manifolds introduced by Gromov as an obstruction to the existence of positive scalar curvature. However in general it is difficult to determine whether K-area is finite or not. though the definition of K-area is quite natural. In this paper, we study how the invariant changes under surgery.
Loop-mediated isothermal amplification applied to filarial parasites detection in the mosquito vectors: Dirofilaria immitis as a study model
Hiroka Aonuma, Aya Yoshimura, Namal Perera, Naoaki Shinzawa, Hironori Bando, Sugao Oshiro, Bryce Nelson, Shinya Fukumoto, Hirotaka Kanuka
Parasites & Vectors , 2009, DOI: 10.1186/1756-3305-2-15
Abstract: LAMP reactions amplifying the cytochrome oxidase subunit I gene demonstrated high sensitivity when a single purified D. immitis microfilaria was detected. Importantly, the robustness of the LAMP reaction was revealed upon identification of an infected mosquito carrying just a single parasite, a level easily overlooked using conventional microscopic analysis. Furthermore, successful detection of D. immitis in wild-caught mosquitoes demonstrated its applicability to field surveys.Due to its simplicity, sensitivity, and reliability, LAMP is suggested as an appropriate diagnostic method for routine diagnosis of mosquito vectors carrying filarial parasites. This method can be applied to the survey of not only canine filariasis but also lymphatic filariasis, another major public health problem. Therefore, this method offers great promise as a useful diagnostic method for filarial parasite detection in endemic filariasis regions.For years, vector-borne zoonotic infectious diseases have had profound debilitating effects on humans. It has recently been revealed that several arthropod vectors including mosquitoes act as "bridge" vectors by transmitting pathogens from animals to humans and vice versa [1]. Human clinical cases of diseases, such as dirofilariasis, babesiosis, and leishmaniases, all caused by parasites transmitted by arthropod vectors from animals, have been reported to be on the rise [2-6]. Infection with these diseases have affects not only on humans but also on domestic and wild animals that can serve as potential reservoirs by hosting pathogens long-term despite being asymptomatic. Because eradication of animal reservoirs has been ethically rejected, surveillance and control of arthropod vectors must be central to programs aimed at elimination of vector-borne zoonotic diseases [5].Dirofilaria species, including D. immitis and D. repens, are particularly important pathogens due to the fact that they induce serious symptoms in domestic animals, especially dogs.
Estimativas da digestibilidade e consumo de matéria seca em ovinos alimentados com feno de aveia e concentrado em resposta ao método de administra??o de alcano externo C32
Fukumoto, Nelson Massaru;Damasceno, Julio Cesar;Roehsig, Lauri;C?rtes, Cristiano;Matsushita, Makoto;Santos, Geraldo Tadeu dos;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000800030
Abstract: this experiment was conducted to estimate dm digestibility, fecal output, and dm intake of sheep fed a diet containing oat hay and concentrate. treatments consisted of two methods of administration of the external marker alkane (c32): equilibrium and pulse dose. in the equilibrium treatment, animals received one daily pellet of cellulose containing 100 mg of c32 during eight days (four days for reach steady state conditions and five days for sample collection). animals in the pulse dose treatment received only one pellet of cellulose containing 150 mg of c32 followed by 5 days of fecal collection with 8 hours intervals between sampling. concentrations of most of the internal n-alkanes in the dietary ingredients were lower than 50 mg/kg dm and were greater on oat hay compared to the concentrate. no significant differences for estimation of dm digestibility were observed between treatments. however, there were significant differences among the internal n-alkanes for estimation of dm digestibility. only the alkane c33 was able to estimate a value of dm digestibility that did not differ of that measured through total fecal collection. estimates of fecal output were less variable in the equilibrium treatment but no difference was detected between treatment means. the equilibrium treatment resulted in better estimates of dm intake because of the smaller deviation (observed - estimated/observed x 100) compared to the pulse dose method (-1.68 vs. 26.14%) that was considered inadequate.
Concentra??es e quantidades de macronutrientes na excre??o de animais em pastagem de capim-momba?a fertilizada com fontes de fósforo
Rodrigues, Augusto Manoel;Cecato, Ulysses;Fukumoto, Nelson Massaru;Galbeiro, Sandra;Santos, Geraldo Tadeu dos;Barbero, Leandro Martins;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000600006
Abstract: the objective of this experiment was to evalute the effects of phosphorus sources (yoorin?, ordinary superphosphate (ss) + triple superphosphate (ts) and control) on the concentration and amount of n, p, k, and ca in the excreta of crossbred steers under grazing conditions on momba?a grass (panicum maximum jacq. cv. momba?a) pasture. the grazing method was the continuous stocking with variable stocking rate, and the animals used were crossbred with average live weight of 300 kg. it was used a complete randomized design in split plot with four replications. urine production and k concentration were high for animals grazing on yoorin fertilized pastures compared to other treatments; urine production ranged from 7.2 to 20.4 l/animal/day and k urine concentration ranged from 180 to 310 g/l. animals grazing on the control and ss + ts treatments presented greater n and p urine concentration than the ones grazing on yoorin fertilized pastures, ranging from 154 to 195 g n/l and 0.2 to 0.29 g p/l, respectively. average n and k amount excreted via urine was greater for animals grazing on yoorin and ss + ts treatments compared to control treatment, ranging from 51 to 99 g n/animal/dia and 46 to 49 g k/animal/dia, respectively. average ca concentration and p and ca amount excreted via urine were similar among treatments. average fecal production and n, k, ca concentrations and amounts were similar among treatments. average p amount was greater for ss + ts and yoorin treatments compared to the control, ranging from 7.5 to 11.6 g p/animal/day. nutrient return via animal excreta contributed in the experimental period with 73, 87, 6, and 28 kg/ha of n, k, p, and ca, respectively. animals on yoorin fertilized pastures presented greater urine production and greater k urine concentration and amount.
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