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Search Results: 1 - 10 of 468526 matches for " Enrique A;Stein "
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Phlebotomine sand flies (Diptera: Psychodidae) of the province of Chaco, Argentina
Rosa, Juan R;Salomon, Oscar D;Andrade Filho, José D;Carvalho, Gustavo M L;Szelag, Enrique A;Stein, Marina;Tapia, Eliana S;Brazil, Reginaldo P;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000200024
Abstract: the phlebotomine sandflies of the province of chaco, argentina, are poorly known, with reports from more than 40 years or captures related with outbreaks of leishmaniasis. in here, mycropygomyia peresi (mangabeira) is reported for the first time in argentina, extending the known dstribution of migonemyia migonei (fran?a), evandromyia sallesi (galv?o & coutinho), mycropygomyia quinquefer (dyar), brumptomyia brumpti (larousse) y nemapalpus spp to the province of chaco. mg. migonei, together with nyssomyia neivai (pinto), evandromyia cortelezzii (brèthes), and psathyromyia shannoni (dyar) also captured in chaco, were incriminated as vectors of leishmania in argentina.
Efecto de la recuperación nutricia sobre la concentración de Interleucina-2 en ni?os con desnutrición grave
Vásquez-Garibay,Edgar; Stein,Katja; Méndez-Estrada,Concepción; Pérez-Becerra,Elías; Romero-Velarde,Enrique; Ibarra Gutiérrez,Isabel; Ortiz Ortega,Miguel ángel; García Iglesias,Trinidad;
Archivos Latinoamericanos de Nutrición , 2008,
Abstract: effect of the nutritional recovery on the concentration of interleukin-2 in severely malnourished children. the severely malnourished child has dysfunction of the immune response that may increase the risk of morbidity or mortality due to infectious diseases, therefore, the purpose of this study was to demonstrate the effect of intensive nutritional support on the cellular and serum concentration of il-2 and cd4+, as well as cd8+ t cells in children with severe protein energy malnutrition. a clinical assay was carried out in a tertiary care hospital. 10 severely malnourished children < 48 months of age who received formula without lactose via enteral feeding for two weeks and ad libitum for an additional two weeks were included. cellular and serum concentrations of il- 2 and the subpopulation of cd4+ and cd8+ were obtained. a control group (n = 13) was included. a paired student t test for initial-final determinations and the mann-whitney test for comparison with control group were used, and null hypothesis was rejected with a p value < 0,05. there was a noteworthy increase in the comparison between the initial vs. final percentage of the cellular expression of il-2 (p < 0,001) and in the serum concentration of il-2 (p = 0,001). therefore, four weeks of nutritional recovery significantly restored the production of il-2, independently of the nutrients involved in the process, although, the rate of restoration seems to depend on the severity of the children primary pem.
OT J075418.7+381225 and OT J230425.8+062546: Promising Candidates for the Period Bouncer
Chikako Nakata,Taichi Kato,Daisaku Nogami,Elena Pavlenko,Tomohito Ohshima,Enrique de Miguel,William Stein,Kazuhiko Siokawa,Etienne Morelle,Hiroshi Itoh,Pavol A. Dubovsky,Igor Kudzej,Hiroyuki Maehara,Arne Henden,William N. Goff,Shawn Dvorak,Oksana Antonyuk,Eddy Muyllaert
Physics , 2014, DOI: 10.1093/pasj/psu108
Abstract: We report on photometric observations of two dwarf novae, OT J075418.7+381225 and OT J230425.8+062546, which underwent superoutburst in 2013 (OT J075418) and in 2011 (OT J230425). Their mean period of the superhump was 0.0722403(26) d (OT J074518) and 0.067317(35) d (OT J230425). These objects showed a very long growing stage of the superhump (stage A) and a large period decrease in stage A-B transition. The long stage A suggests slow evolution of the superhump due to very small mass ratios of these objects. The decline rates during the plateau phase in the superoutburst of these objects were lower than those of SU UMa-type DNe with a similar superhump period. These properties were similar to those of SSS J122221.7-311523, the best candidate for the period bouncer. Therefore, these two DNe are regarded as good candidates for the period bouncer. We estimated the number density of period bouncers roughly from our observations in the recent five years. There is a possibility that these WZ Sge-type dwarf novae with unusual outburst properties can account for the missing population of the period bouncer expected from the evolutionary scenario.
Emergency Surgical Intervention by Mobile Surgical Team in the NICU  [PDF]
R.-B. Trobs, A. Stein, U. Felderhoff, L. Hanssler
Open Journal of Pediatrics (OJPed) , 2014, DOI: 10.4236/ojped.2014.42022

The objective of this study was to describe our NICU’s (neonatal intensive care unit) experience with mobile surgical team and to demonstrate its effectiveness. Method: We analyzed the data of 17 consecutive very low birth weight and extremely low birth weight infants over 3 years who underwent 22 procedures (19 emergency and 3 elective). The gestational age at birth was a median of 25 weeks (range 24 - 39), and the median birth weight was 613 g (range from 340 g to 1100 g). The infants received their operations during their first 2 weeks of life (median 7 days, range from 1 to 14). Results: The spectrum of primary surgical diagnoses included spontaneous intestinal perforations (n = 8), gastric perforations (n = 3), necrotizing enterocolitis (n = 2), meconium ileus (n = 2), and miscellaneous (n = 2). An emergency laparotomy with either a bowel or a gastric procedure was performed in 16 cases. Postoperatively, all infants required mechanical ventilation from 1 to 43 days (median 6.5 days). Complications included a metachronous small bowel perforation, an ileostomy retraction, a prolapsed stoma, and impaired wound healing; we had one postoperative death. Two infants died later in the NICU (mortality 3 of 16; 19%). Conclusion: Off-site surgery for preterm infants in the NICU is feasible. This approach prevents the risks of transportation, and parents and neonatologists alike feel comfortable with this regimen. However, biases may exist regarding the surgeon’s decision to operate, the choice of procedure, and the follow-up.

Stein.,A 顾聚兴
红外 , 1991,
A Pessimistic Approximation for the Fisher Information Measure
Manuel Stein,Josef A. Nossek
Mathematics , 2015,
Abstract: The problem how to determine the intrinsic quality of a signal processing system with respect to the inference of an unknown deterministic parameter $\theta$ is considered. While Fisher's information measure $F(\theta)$ forms a classical analytical tool for such a problem, direct computation of the information measure can become difficult in certain situations. This in particular forms an obstacle for the estimation theoretic performance analysis of non-linear measurement systems, where the form of the conditional output probability function can make calculation of the information measure $F(\theta)$ difficult. Based on the Cauchy-Schwarz inequality, we establish an alternative information measure $S(\theta)$. It forms a pessimistic approximation to the Fisher information $F(\theta)$ and has the property that it can be evaluated with the first four output moments at hand. These entities usually exhibit good mathematical tractability or can be determined at low-complexity by output measurements in a calibrated setup or via numerical simulations. With various examples we show that $S(\theta)$ provides a good conservative approximation for $F(\theta)$ and outline different estimation theoretic problems where the presented information bound turns out to be useful.
Asymptotic Behavior of the Stock Price Distribution Density and Implied Volatility in Stochastic Volatility Models
A. Gulisashvili,E. M. Stein
Quantitative Finance , 2009,
Abstract: We study the asymptotic behavior of distribution densities arising in stock price models with stochastic volatility. The main objects of our interest in the present paper are the density of time averages of the squared volatility process and the density of the stock price process in the Stein-Stein and the Heston model. We find explicit formulas for leading terms in asymptotic expansions of these densities and give error estimates. As an application of our results, sharp asymptotic formulas for the implied volatility in the Stein-Stein and the Heston model are obtained.
An Opportunistic Pantoea sp. Isolated from a Cotton Fleahopper That Is Capable of Causing Cotton (Gossypium hirsutum L.) Bud Rot  [PDF]
Enrique G. Medrano, Alois A. Bell
Agricultural Sciences (AS) , 2017, DOI: 10.4236/as.2017.81006
Abstract: Pantoea ananatis (Serrano) representatives are known to have a broad host range including both humans and plants. The cotton fleahopper (Pseudatomoscelis seriatus, Reuter) is a significant pest that causes cotton bud damage that may result in significant yield losses. In this study, a bacterial strain previously isolated from a fleahopper was tested for cotton infectivity using simulated insect feeding. In addition, cotton fleahoppers collected from the field were raised on green beans in the laboratory to test the insects’ capacity to vector cotton pathogens. Adult insects were then caged with greenhouse grown cotton buds. Buds that remained or abscised from the plants following feeding by the insect consistently showed necrosis of the ovary including the wall. A collection of bacterial isolates from both caged insects and diseased buds was analyzed using carbon utilization and enzyme production tests, fatty acid methyl ester profile analysis, and by cloning and sequencing 16S RNA genes. Results showed that the majority of the isolates were best classified as P. ananatis. Upon simulated fleahopper feeding (i.e., penetrative inoculation), the fleahopper isolate rotted cotton buds. These results indicated the fleahoppers are vectors of opportunistic P. ananatis strains causing loss of the cotton fruiting structures.
WZ Sge-type dwarf novae with multiple rebrightenings: MASTER OT J211258.65+242145.4 and MASTER OT J203749.39+552210.3
Chikako Nakata,Tomohito Ohshima,Taichi Kato,Daisaku Nogami,Gianluca Masi,Enrique de Miguel,Joseph Ulowetz,Colin Littlefield,William N. Goff,Thomas Krajci,Hiroyuki Maehara,William Stein,Richard Sabo,Ryo Noguchi,Rikako Ono,Miho Kawabata,Hisami Furukawa,Katsura Matsumoto,Takehiro Ishibashi,Pavol A. Dubovsky,Igor Kudzej,Shawn Dvorak,Franz-Josef Hambsch,Roger D. Pickard,Etienne Morelle,Eddy Muyllaert,Stefano Padovan,Arne Henden
Physics , 2013, DOI: 10.1093/pasj/65.6.117
Abstract: We report on photometric observations of WZ Sge-type dwarf novae, MASTER OT J211258.65+242145.4 and MASTER OT J203749.39+552210.3 which underwent outbursts in 2012. Early superhumps were recorded in both systems. During superoutburst plateau, ordinary superhumps with a period of 0.060291(4) d (MASTER J211258) and of 0.061307(9) d (MASTER J203749) in average were observed. MASTER J211258 and MASTER J203749 exhibited eight and more than four post-superoutburst rebrightenings, respectively. In the final part of the superoutburst, an increase in the superhump periods was seen in both systems. We have made a survey of WZ Sge-type dwarf novae with multiple rebrightenings, and confirmed that the superhump periods of WZ Sge-type dwarf novae with multiple rebrightenings were longer than those of WZ Sge-type dwarf novae without a rebrightening. Although WZ Sge-type dwarf novae with multiple rebrightenings have been thought to be the good candidates for period bouncers based on their low mass ratio (q) from inferred from the period of fully grown (stage B) superhumps, our new method using the period of growing superhumps (stage A superhumps), however, implies higher q than those expected from stage B superhumps. These q values appear to be consistent with the duration of the stage A superoutbursts, which likely reflects the growth time of the 3:1 resonance. We present a working hypothesis that the small fractional superhump excesses for stage B superhumps in these systems may be explained as a result that a higher gas pressure effect works in these systems than in ordinary SU UMa-type dwarf novae. This result leads to a new picture that WZ Sge-type dwarf novae with multiple rebrightenings and SU UMa-type dwarf novae without a rebrightening (they are not period bouncers) are located in the same place on the evolutionary track.
Temperature dependence of spin susceptibility in two-dimensional Fermi liquid systems
A. Shekhter,A. M. Finkel'stein
Physics , 2006, DOI: 10.1103/PhysRevB.74.205122
Abstract: We consider the non-analytic terms in the spin susceptibility arising as a result of rescaterring of pairs of quasiparticles. We emphasize the importance of rescattering in the Cooper channel for the analysis of the temperature dependences in the two-dimensional electron systems in the ballistic regime. In the calculation of the linear in $T$ term we use angular harmonics in the Cooper channel, because for each harmonic the interaction amplitude is renormalized independently. We observe, that as a consequence of strong renormalizations in the Cooper ladder, the temperature derivative of the spin susceptibility may change its sign at low temperatures.
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