Galaxy (Total 27424 Papers Found)

Galaxy (27424 Papers Found)
Under some conditions, gradable adjectives in Mandarin must co-occur with overt degree morphology (most neutrally, hen ‘very’) for positive interpretation; otherwise, a comparative interpretation results. This paper argues that this phenomenon is the consequence of two interacting factors: (1) Universally, whereas comparative semantics is provided by a (possibly covert) morpheme in syntax, positive semantics is provided by a type-shifting rule that does not project in syntax, and (2) The T[+ ...
Combining far-infrared Herschel photometry from the PACS Evolutionary Probe (PEP) and Herschel Multi-tiered Extragalactic Survey (HerMES) guaranteed time programs with ancillary datasets in the GOODS-N, GOODS-S, and COSMOS fields, it is possible to sample the 8–500 μm spectral energy distributions (SEDs) of galaxies with at least 7–10 bands. Extending to the UV, optical, and near-infrared, the number of bands increases up to 43. We reproduce the distribution of galaxies in a carefully selec ...
Seventeen tea accessions belonging to Chinese (Camellia sinensis), Assamic (C. sinensis var. assamica), and Shan tea (C. sinensis var. pubilimba) groups, which are either commercially planted or new promising tea germplasm, were morphologically described at Phu Tho province (Viet Nam) and assessed for their diversity. Fourteen phyllometric parameters were qualitatively and quantitatively investigated using digital image analysis. The accessions were then discriminated by a dedicated artificial n ...
We present a characterization of the local luminosity-color, bi-variate distribution of IRAS galaxies from the 1.2 Jy sample, selected at 60μm. The R(60,100) infrared color is used as the best single parameter description of the IR spectral energy distribution of galaxies. We derive an analytical form of the distribution and use it to constrain the effect of the IR color distribution on evolution models for high redshift, farIR luminous galaxies. Our adopted evolution retains the locally observ ...
A complete sample of 659 field galaxies with 17.0<U≤21.1, each with U-B-VR-I7500-I8600 photometry, has been selected from a deep field survey which covers 0.83 deg2 along six lines of sight (Hall et al. 1996a). Each galaxy’s spectral type and redshift has been estimated using a multicolor photometric technique (Liu & Green 1998). Total number counts of the galaxies in the U-band give a count slope d(logN)/dM = 0.55 ± 0.05, consistent with previous studies. The 545 galaxies in the sample ...
The scaling of electronic devices also requires the evolution of high energy density power sources. By using nanowires, high charge storage materials, which otherwise have mechanical breakage problems due to large structure transformations and volume changes, can be adopted as electrode materials. High power operation can also be possible due to the short lithium insertion distances in the nanowires. We have studied Si and Ge nanowires and demonstrated charge storage capacities several times hig ...
The conchocelis of Porphyry is an important phase in its life cycle . Results of many studies on the ecological requirements of conchocelis during different stages of its growth and development show that the morphological characteristics of conchocelis in these different stages are useful criteria in distinguishing species of Porphyra. Porphyra katadai Miuravar . hemiphyllaTseng& Chang (Tseng & Chang, 1978), which is abundant in the Bohai Sea and Huanghai Sea, differs from P. i'e :oensis Ueda (U ...
Polar ring galaxies are flattened stellar systems with an extended ring of gas and stars rotating in a plane almost perpendicular to the central galaxy. We show that their formation can occur naturally in a hierarchical universe where most low mass galaxies are assembled through the accretion of cold gas infalling along megaparsec scale filamentary structures. Within a large cosmological hydrodynamical simulation we find a system that closely resembles the classic polar ring galaxy NGC 4650A. Ho ...
The main directions of the evolutionary transformation of some genital structures are demonstrated on the basis of morphoclines. Due to the adequate stability in position of the muscles in the copulatory apparatus the functional morphological method is suffi ciently reliable in solving taxonomic and phylogenetic problems. Some important misinterpretations of the homology in genital structures and incorrect coding in matrices for cladistic analyses are discussed, highlighting the signifi cance of ...
We report the XMM-Newton discovery of a X-ray bright AGN pair in the interacting galaxy system ESO509-IG066. Both galaxies host an X-ray luminous (LX ∼ 10 43 erg s) obscured nucleus with column densities NH ≃ 7 × 10 22 cm and NH ≃ 5 × 10 21 cm. The optical morphology is only mildly disturbed, suggesting a merging system in the early stage of its evolution. Still, the pair is probably gravitationally bound, and might eventually evolve into a compact, fully gas embedded systems such as NGC ...
Silica based waveguides on Si fabricated by flame hydrolysis deposition were doped with erbium ions using an aerosol doping technique, and co-doped with GeO2, P2O5 and B2O3. Erbium doping levels in the films were dependent on the nebulized solution concentration and delivery rate of the aerosol to the torch. The erbium solution concentration was varied from 4 to 8 wt%. The refractive index was measured by a prism coupler at 633 nm. FTIR absorption spectra and XRD profiles were made to check the ...
The aim of this work is to determine mean diameter of polycrystalline samples using Scherrer equation. These represent direct connection between mean diameter and crystal structure and morphology by including the Bragg angle and shape factor. Two samples are investigated, first a nano-sized particles of MgO and second a CVD (Chemical Vacuum Deposition) obtained polycrystalline aluminum film. First, shape factor and mean diameter are evaluates using direct measurement of particle morphology from ...
Ten morphologically similar species of Acrapex from eastern and south-eastern Africa belonging to the A. stygiata and A. albivena groups are reviewed. Six species are described as new: A. brunneella, A. mitiwa, A. mpika, A. salmona, A. sporobola and A. yakoba. The Poaceae host plants of eight species are recorded; four species, A. mitiwa. A. subalbissima, A. syscia andA. yakoba, were found developing exclusively on Imperata cylindrica (L.) Beauv., (Andropogoneae); two species, A. sporobola and A ...
We present new broadband optical and near-infrared CCD imaging together with deep optical intermediateresolution spectroscopy of the Hickson Compact Group 31. We analyze the morphology and colors of the stellar populations of the galaxies, as well as the kinematics, physical conditions, and chemical composition of the ionized gas in order to get a more complete view on the origin and evolution of the system. We estimate the ages of the most recent star formation bursts of the system, finding an ...
The Chinese culture of tea drinking is rooted in people's daily lives. With the passing of dynasties, tea-drinking methods have evolved, from tea bowls in the Song Dynasty to small teacups in the Ming Dynasty. The function of a teacup is not only to hold the tea liquid; it should also develop a better quality of tea. Much research has been done into the influence of a receptacle's color and shape on the perception of coffee, juice and wine, but not tea. The purpose of this study is to investigat ...
The present study reports the synthesis of silver nanoparticle using Morus nigra leaf extract were used as reducing agent for reduction of silver nitrate solution. The synthesis of silver nanoparticles was analyzed by UV-Visible spectroscopy, Scanning Electron Microscopy. The SEM analysis has shown that size of silver nanoparticles synthesized from leaves extract of M.nigra was 200 nm and seems to be spherical in morphology. Morphology of chemically synthesized silver nanoparticles is nearly sph ...
The search in this laboratory for simple and well-defined structures for analytical studies on morphogenesis on a submicroscopic scale has revealed a remarkably regular architectural pattern in the basement membrane of larval amphibians. As the origin, local variations, and role of this fine structure in embryonic development, wound healing, regeneration, and metamorphosis are being made the subject of a systematic study, we wish to report here its basic features. In careful observations with ph ...
Breast cancer http://www.cancer.gov/ cancertopics/types/breast Many organs in the body are made up of a network of branched tubules. Disruption of this network is evident in human breast cancer, indicating that the cells are no longer responsive to positional signals that govern when and where branches are formed. Although many of the global signals that control branching morphogenesis are known, how these are integrated at the local (cellular) level is not clear. Celeste Nelson, Mina Bissell an ...
Coastal ocean processes are complicated and they happen as various phenomena that span a vast range of spatial and temporal scales. For instance, general circulations of oceans occur at global scales (Wunsch & Ferrari, 2004). Tropical waves that eventually impact coastal waters propagate with wavelengths of one thousand kilometers and periods of one month (Legeckis et al., 1983). Langmuir cells, which are pairs of vortices hanging below water surfaces, have spatial sizes ranging from one to hund ...
In our work, interface synthesis method was put forward to prepare FePO4 with different morphologies, and the effect of morphology on the preparation and electrochemical performance of LiFePO4/C was investigated. The results showed that the morphology of FePO4 was amorphous and monoclinic at the treatment temperatures of 30 °C and 80 °C, respectively. LiFePO4/C prepared from two crystal precursors were both hemispherical hollow with an olivine crystal structure. LiFePO4/C produced from the mon ...
Many a times, both anatomist and morbid anatomist have been called upon to use physical features of organs of human body to determine the sex of an individual. This study was conducted to determine the variations in the morphology of an adult human cadaveric liver in Nigeria. Collections of adult human livers 62 (38 male and 24 female) of > 25 years of age was carried out for a period 3 years between March, 2008 and February, 2010 at the gross anatomy laboratories of University of Maiduguri a ...
Address for Correspondence: Dr. K G Prakash, Professor and Head, Department of Anatomy, Azeezia Institute of Medical Sciences, Kollam, Kerala State691537, India. Phone no.: +919645216564. E-Mail: drprakashkg@gmail.com Background: Foramen Vesalius a small inconsistent foramen in the base of skull for passage of emissary vein from pterygoid plexus of veins to cavernous sinus. Variations in incidence and morphology are reported in literature. The objective of this study as to estimate its incidence ...
Bat flies (Diptera: Hippoboscoidea) are highly specialized ectoparasites and only associate with bats (Mammalia: Chiroptera). They live in the fur and on the wing membranes where they feed on host blood. Bat flies are nominally divided into two cosmopolitan families, Streblidae and Nycteribiidae, but recent phylogenetic studies suggest these are not natural groups (Dittmar et al. 2006). Nycteribiids (275 species) are more speciose in the Eastern Hemisphere, whereas the streblids (227 species) ar ...
Farmers’ Varietal Identification in a Reference Sample of Local Phaseolus Species in the Sierra Juárez, Oaxaca, Mexico. Farmer-named varieties are often the basis of in situ diversity assessment, collections for ex situ conservation, and on-farm improvement programs. Such varieties play an important role in sustainable agriculture because of their adaptation to local environmental conditions and consumer tastes. The importance of these varieties has stimulated interest in understanding farmer ...
We show that the luminosity of a star forming galaxy is capped by the production and subsequent expulsion of cosmic rays from its interstellar medium. By defining an Eddington luminosity in cosmic rays, we show that the star formation rate of a given galaxy is limited by its mass content and the cosmic ray mean free path. When the cosmic ray luminosity and pressure reaches a critical value as a result of vigorous star formation, hydrostatic balance is lost, a galactic scale cosmic ray-driven win ...
We investigate the environmental dependence of the mass-metallicity relation at z = 2 with MOSFIRE/Keck as part of the ZFIRE survey. Here, we present the chemical abundance of a Virgo-like progenitor at z = 2.095 that has an established red sequence. We identified 43 cluster (< z >= 2.095± 0.004) and 74 field galaxies (< z >= 2.195± 0.083) for which we can measure metallicities. For the first time, we show that there is no discernible difference between the mass-metallicity relatio ...
Precise control of size and shape are important goals in the synthesis of functional nanoparticles, as these factors play a key role in determining properties. Morphology control in the formation of iron oxide and oxyhydroxide nanoparticles can be approached in a number of ways, and this presentation outlines some of the approaches that have been explored in recent work at the Nanochemistry Research Institute. In some cases, control of nanostructure and particle aggregation characteristics can b ...
Analyses of distribution patterns and genetic structures of forest stands can address distinct family structures and provide insights into the association of genetic and phenotypic variation patterns. In this study, point pattern analysis and spatial autocorrelation were used to examine the spatial and genetic structures in two naturally generated beech stands, which differ in age, trunk morphology, and stand management. Significant tree clumping was observed at distances up to 20 m in the youn ...
We report the detection of Mg ii absorption in two Lyα forest clouds along the line of sight to PKS 0454 + 039. These clouds, at redshifts z = 0.6248 and z = 0.9315, respectively, also have strong Fe ii absorption. The upper limit on logN(H i) for the z = 0.9315 cloud is 15.5 cm. Based upon photoionization models, we infer that the cloud either has super–solar metallicity or likely arises in a low surface brightness dwarf galaxy with a late–type stellar population. 1 Scientific Consideratio ...
During migratory stopovers, rufous hummingbirds (Selasphorus rufus (Gmelin, 1788)) can achieve high daily rates of net energy intake and mass gain while foraging at a range of elevations and ambient temperatures, despite the high energetic costs of hovering flight and thermoregulation. To gain insights into the factors affecting the energetic costs incurred during foraging, we captured migratory hummingbirds and measured their oxygen consumption rates during hover-feeding. Measurements were perf ...
Despite the extensive records on geomorphological studies in Iran, meteorite impact craters have so far not been considered in to account. Based on both remote sensing technique and field work we have recognized the circular structure of Zirouki crater in the Samsour desert, southeast of Iran, which if confirmed as an impact structure, would be the third impact structure candidate in the Middle East after the Wabar craters in Saudia Arabia and Jebel Waqf as Suwwan in Jordan. Geomorphological inv ...
The weevil genus Azotoctla gen. nov. (Coleoptera: Curculionidae: Curculioninae: Acalyptini Thomson), is described to accommodate the following 15 new Neotropical species: Azotoctla aecuatorialis sp. nov. (Ecuador), Azotoctla anerunca sp. nov. (Ecuador), Azotoctla angustacra sp. nov. (Ecuador), Azotoctla curvirostra sp. nov. (Peru), Azotoctla dasygastra sp. nov. (Costa Rica and Honduras), Azotoctla femorata sp. nov. (Colombia, Costa Rica, Ecuador and Panama), Azotoctla gomezi sp. nov. (Colombia, ...
The recent detection of a young pulsar powering " the Mouse " , G359.23–0.82, as well as detailed imaging of surrounding nebular X-ray emission, have motivated us to investigate the structural details and polarization characteristics of the radio emission from this axisymmetric source with a supersonic bow shock. Using polarization data at 3.6 and 6cm, we find that the magnetic field wraps around the bow shock structure near the apex of the system, but downnstream runs parallel to the inferred ...
We present quantitative morphological analyses of 37 HST/WFPC2 counterparts of X-ray sources in the 1 Ms Chandra Deep Field–South (CDFS). We investigate: 1) one-dimensional surface brightness profiles via isophotal ellipse fitting; 2) two-dimensional, PSF-convolved, bulge+disk+nucleus profile-fitting; 3) asymmetry and concentration indices compared with all ∼ 3000 sources in our three WFPC2 fields; and 4) near-neighbor analyses comparing local environments of X-ray sources versus the field c ...
A reduced-eye (re) mutant grasshopper of Melanoplus sanguinipes has been characterized by small flat compound eyes lacking facets, no lateral ocelli and only a remnant of the median ocellus. The re grasshoppers walk, jump, fly and feed in a normal manner, but do not respond to visual and auditory stimuli, suggesting they may be blind and deaf. Extracellular recordings from the ventral nerve cord of re mutants verified the lack of neural activity in response to visual and auditory inputs, yet the ...
 Intergeneric hybrids between Brassica juncea (2n=36), B. carinata (2n=34) and Orychophragmus violaceus (2n=24) were produced when B. juncea and B. carinata cultivars were used as female parents. The hybrids between B. juncea and O. violaceus had an intermediate morphology except for petal colour and were partially fertile. The hybrids between B. carinata and O. violaceus had a matroclinous morphology and were nearly fertile. Cytological analysis of the hybrids and their progenies gave the fol ...
The broadly distributed Neotropical stingless bee Tetragonisca angustula was once regarded as having two subspecies, T. angustula angustula and T. angustula fiebrigi. In a recent taxonomic revision, these subspecies were elevated to species status (T. angustula and Tetragonisca fiebrigi) based on morphology and distribution. While molecular studies show two well-delineated subgroups within the Tetragonisca, they are inconclusive as to whether there is gene flow between T. angustula and T. fiebri ...
Mechanomyography (MMG) is the muscle surface oscillations that are generated by the dimensional change of the contracting muscle fibers. Because MMG reflects the number of recruited motor units and their firing rates, just as electromyography (EMG) is influenced by these two factors, it can be used to estimate the force exerted by skeletal muscles. The aim of this study was to demonstrate the feasibility of MMG for estimating the elbow flexion force at the wrist under an isometric contraction by ...
Stegnogramma pozoi (Lagasca) K. Iwats. subsp.mollissima (Fischer ex Kunze) K. Iwats. is one of the most common ferns in Japan with a very broad geographical distribution and habitat ranges. We examined the intrasubspecific variation of therbcL gene, and found three types in the subspecies (Atami-1, Atami-2, and Tateyama types). The Atami-1 and 2 types shared three apomorphic nucleotides and their geographical distribution is intermingled. Thus, we considered them to have intraspecific variation. ...
The shell-type supernova remnant RX J1713.7–3946 was observed during three years with the H.E.S.S. Cherenkov telescope system. The first observation campaign in 2003 yielded the first-ever resolved TeV gamma-ray image. Follow-up observations in 2004 and 2005 revealed the very-high-energy gamma-ray morphology with unprecedented precision and enabled spatially resolved spectral studies. Combining the data of three years, we obtain significantly increased statistics and energy coverage of the gam ...
Morphometric measures and geometrical features are widely used to descript faces. Generally, they are extracted punctually from landmarks, namely anthropometric reference points. The aims are various, such as face recognition, facial expression recognition, face detection, study of changes in facial morphology due to growth, or dysmorphologies. Most of the time, landmarks were extracted with the help of an algorithm or manually located on the faces. Then, measures are computed or geometrical fea ...
Gonadal steroid hormones, particularly testosterone (T) and related androgens, are important in the development and seasonal variation of sexually dimorphic organs. Other hormones, such as prolactin, have been found to be necessary in conjunction with gonadal steroids for the full structural development and function of some sex accessory structures (e.g., oviductal and cloacal gland secretions) and secondary sexual characteristics (e.g., genial glands and skin glands of newts). Thyroid hormones ...
1. This study describes the structure and functional significance of numerous song dialects in island populations of Darwin's finches from the Galápagos Archipelago. 2. The following acoustical information was obtained from tape recordings made in the islands: a. For songs: Frequency bandwidth, relative amplitude distribution according to frequency, and absolute sound pressure levels (dB). b. For the environment: Attenuation characteristics of a broadband frequency spectrum (“pink” noise) b ...
Many snakes, particularly cobras, form as part of a defensive display, a hood, an active lateral expansion of their neck skin and underlying musculature and ribs. We identified muscle groups possibly involved in hooding based on their attachments on the specialized ribs of the neck. We then used a combination of morphology, kinematic analysis, morphometrics, electromyography and muscle stimulation to test hypotheses about the functional basis of hooding. We confirmed that hood protraction and er ...
Nonlethal tail injury resulting from unsuccessful predation attempts is common in anuran larvae and can potentially induce significant fitness costs in terms of survival and growth. We tested the hypotheses that the alien red swamp crayfish, Procambarus clarkii, is an important inducer of tail injury in tadpoles of the Iberian spadefoot toad, Pelobates cultripes, and that tail damage can have important consequences for the tadpoles’ life history and morphology. This was investigated by first e ...
Five strains of obligate anaerobic sulfur-reducing eubacteria that exclusively use acetate as energy and carbon source have been enriched and isolated from anoxic sulfide-containing freshwater mud. The strains were unable to grow in the presence of 2% NaCl. Morphologically the strains were not uniform, cells were either rod-shaped or elongated ovoid. All strains were flagellated with a single polar to subpolar flagellum. They stained gram-negative. Two of the strains were studied in detail. Mala ...
The ant Paratrechina longicornis is a cosmopolitan ant species that has been accidentally spread by commerce around the world, and now is a pest of houses and hospitals. The morphology of its larval stages has been previously described without knowledge of the number of instars. The present study revisits the original description of P. longicornis larvae by adding differences observed among the three larval instars. Compared to other Paratrechina species studied so far, P. longicornis presents s ...
Silicone tubing is frequently used for gas exchange in cell culture systems, due to its biocompatibility and high permeability to CO2 and O2. In cell culture chambers, medium pH and oxygen levels are often maintained by gas exchange through a coil of silicone tubing. Culture medium is recirculated between the gas exchanger and the culture chamber which contains a suspension of cells. We report that the type of agent used for silicone vulcanization (peroxide or platinum) can markedly affect its b ...
We present a demographic analysis of integrated star formation and gas properties for a sample of galaxies representative of the overall population at z ∼ 0. This research was undertaken in order to characterise the nature of star formation and interstellar medium (ISM) behaviour in the local universe, and test the extent to which global star formation rates can be seen as dependent on the interstellar gas content. Archival 21 cm derived H i data are compiled from the literature, and are combi ...