88,986 research outputs found
How can Dermanyssus gallinae (De Geer 1778) (Acari_Dermanyssidae) walk upwards on slippery surfaces
No full textScanning electron microscopy observations of the distal leg region of the poultry red mite Dermanyssus gallinae (De Geer 1778) identified the presence of a compound ambulacrum, the part of the leg that contacts the substratum when the mite walks. The ambulacrum is comprised of a praetarsus (the ambulacrum stalk), a pulvillus and two claws. The pulvillus is a weakly sclerotized structure that can be partly expanded or retracted in the praetarsus. When expanded, the pulvillus shows a cushion-like shape which can, as a result of its soft surface, function as a sucker, thus allowing D. gallinae to adhere to a smooth surface. When traversing an irregular surface, or clinging to a soft surface, the mite retracts the pulvillus and uses only its strongly sclerotized movable claws. These observed morphological adaptations explain the ability of D. gallinae to climb upwards on a slippery surface, resist an air flux, walk on smooth and rigid feathers of its avian hosts, and cling to the bird’s or human's soft skin. This knowledge is important to better understand the attachment mechanism of this species to its host and to the substratum on which it moves, and also to provide insight into the circumstances under which it is able to move. RESEARCH HIGHLIGHTS The ambulacrum is the distal part of the leg touching the substratum D. gallinae’s ambulacrum consists of a praetarsus, a pulvillus and two claws The weakly sclerotized pulvillus can be part expanded/retracted in the praetarsus The expanded pulvillus functions as a sucker to adhere to smooth surfaces The claws are used to walk on an irregular surface or cling to a soft surface
Self-mixing feedback in a laser diode for intra-arterial optical blood velocimetry
No full textIntra-arterial measurements of the velocity and the average flow of red-blood cells were investigated by means of a fiber-coupled laser Doppler velocimeter based on the self-mixing effect. The velocity of the red cells was calculated from the frequency of the signal that occurs when light, scattered back from a moving object in front of a fiber into a laser-diode cavity, interferes with the laser cavity’s proper mode. These fluctuations occur at the Doppler frequency. The signal was obtained from the photodiode that is present in the laser diode’s housing. Temperature control and stabilization of the diode cavity were introduced to reduce the light-intensity fluctuation that is due to mode hopping of the diode. The velocimeter was calibrated with a rotating disk covered with white paper (nonlinearity of 2.6% for velocities up to 0.4 m/s) and tested in vitro as a fluid velocimeter. The velocimeter was used in in vivo tests on the iliac artery of a 35-kg pig and on the arteria pulmonaris of a healthy calf. The optical fiber was placed in the iliac artery by a basket catheter 4 cm proximal to the bifurcation of the femoral artery. The average arterial blood flow velocity of the red cells were measured upstream and downstream. A special cleaving procedure for the fiber tip in downstream measurement is reported. Blood-velocity measurement is compared with values generated by an ultrasound flowmeter, and a difference of less than 9% is found
Non cholinergic excitatory transmission is enhanced in duodenum from dystrophic (mdx) mice
No full textVariations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Bacterial strains used in this study and results from PCRs using primer pair Mul-15040-F/R or 272-1-int/272-2-int.
No full text<p><sup>a</sup> Presence or absence of the 312-bp PCR fragment amplified by Mul-15040-F/R, or the 472-bp band by 272-1-int/272-2-int primers [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0129330#pone.0129330.ref030" target="_blank">30</a>] was indicated by “+” or “-”, respectively.</p><p><sup>b</sup>Presence of the 733-bp PCR fragment amplified by <i>X</i>. <i>fastidiosa</i>-specific primers RST31/RST33 [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0129330#pone.0129330.ref029" target="_blank">29</a>].</p><p>Bacterial strains used in this study and results from PCRs using primer pair Mul-15040-F/R or 272-1-int/272-2-int.</p
Alignment of nucleotide sequences of the open reading frame conserved among the two mulberry-infecting strains Mul-MD and MUL0034, as well the Italian olive-associated strain CoDiRO of <i>X</i>. <i>fastidiosa</i>.
No full text<p>The forward primer Mul-15040-F is underlined and the reverse primer Mul-15040-R (reversed and complementary) is boxed in the Mul-MD strain. The nucleotides in CoDiRO that are different from the Mul-MD and MUL0034 strains are shaded in gray. Numbers indicate the size of the nucleotide sequence.</p
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Electrochemical production of hydrocarbons from carbon dioxide and water
No full textElectrocatalytic reduction of CO2 is one possibility to solve the electrical energy storage problem and decrease the amount of CO2. Copper is the only metal that has been reported to produce hydrocarbons in the electrochemical CO2 reduction at ambient pressure and temperature. External parameters (potential, temperature and electrolyte), copper catalyst morphology and purity and newly designed carbon-based electrodes were investigated. The highest Faraday efficiency towards hydrocarbons at 22°C was obtained at a fixed potential of -2.50 V vs. Ag/AgCl reference electrode. The best electrolyte solution is 0.1 M KHCO3. Methane is the dominant product. FE towards ethylene maximizes at -2.25 V. Up to 40°C, the total Faraday efficiency towards hydrocarbons is not influenced by temperature, but ethylene amount increases with increasing temperature. Above 40°C hardly any hydrocarbons are formed. Altering the surface structure of the copper catalyst by electrodeposition give different results for the electrocatalytic CO2 reduction. The rougher the surface, the less methane and the more ethylene was formed. The macroscopic smooth surfaces are related to the (001) orientation and a rough macroscopic surface is related to the (111) orientation. To increase the surface area, carbon-based catalyst supports (graphite plates, carbon nanofibers and carbon xerogels) were tested. They show promising results.ChemEApplied Science
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
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