6,785 research outputs found
Bilateral inferior renal polar arteries with a high origin from the abdominal aorta
Bilateral multiple renal arteries are not-so-rare variations. However, inferior renal polar arteries with a high origin from the abdominal aorta have rarely been reported. We found bilateral inferior renal polar arteries with a high origin from the abdominal aorta in an 84-year-old Korean female cadaver. Two right and three left renal arteries were seen with the lowest as the main renal artery bilaterally. The highest artery crossed the main renal artery and penetrated into the inferior pole of the kidney, respectively. After dissection, each inferior polar artery could be classified as the inferior segmental branch. A further understanding on its embryogenesis might be important since variations in renal arteries are of particular interest to clinicians as well as anatomists
Elastic Cross Sections for Electron Collisions with Molecules Relevant to Plasma Processing
Absolute electron-impact cross sections for molecular targets, including their radicals, are important in developing plasma reactors and testing various plasma processing gases. Low-energy electron collision data for these gases are sparse and only the limited cross section data are available. In this report, elastic cross sections for electron-polyatomic molecule collisions are compiled and reviewed for 17molecules relevant to plasma processing. Elastic cross sections are essential for the absolute scale conversion of inelastic cross sections, as well as for testing computational methods. Data are collected and reviewed for elastic differential, integral, and momentum transfer cross sections and, for each molecule, the recommended values of the cross section are presented. The literature has been surveyed through early 2010.This work is accomplished as a collaboration through APAN (Asia-Pacific Atomic Data Network: a network for dissemination of collisional data relevant to plasmas, discharges, materials, and biosciences). H.C. acknowledges a support by the National Research Foundation of Korea (Grant No. 20100000035), and M.J.B. and S.J.B. support from the Australian Research Council Center of Excellence for Antimatter-Matter Studies. Collaboration between NIFS and NFRI is also acknowledged for the Korea-Japan exchanges
Two different variants of the jugulocephalic vein with supraclavicular course
The jugulocephalic anastomosis is a rare anatomical variant which normally undergoes atrophy during embryonic development. We found 2 cases of the jugulocephalic vein variant with supraclavicular course in Korean male cadavers. In a 50-year-old cadaver, the right cephalic vein ascended anterior to the clavicle, and terminated into the external jugular vein as well as to the axillary vein through a classic branch. In a 76-year-old cadaver, the left cephalic vein ascended supraclavicular course without any branch to the axillary vein, and terminated to the external jugular vein. We discussed the embryological explanation as well as its frequency since this jugulocephalic vein variant could cause unpredicted danger during clinical procedures
Globular cluster systems of early-type galaxies in low-density environments
Deep images of 10 early-type galaxies in low-density environments have been obtained with the Advanced Camera for Surveys (ACS) aboard the Hubble Space Telescope. The global properties of the globular cluster (GC) systems of the galaxies have been derived in order to investigate the role of the environment in galaxy formation and evolution. Using the ACS Virgo Cluster Survey as a high-density counterpart, the similarities and differences between the GC properties in high- and low-density environments are presented. We find a strong correlation of the GC mean colours and the degree of colour bimodality with the host galaxy luminosity in low-density environments, in good agreement with high-density environments. In contrast, the GC mean colours at a given host luminosity are somewhat bluer [Ī(gāz) ā¼ 0.05] than those for cluster galaxies, indicating more metal poor (Ī[Fe/H] ā¼ 0.10 ā 0.15) and/or younger (Īage > 2 Gyr) GC systems than those in dense environments. Furthermore, with decreasing host luminosity, the colour bimodality disappears faster, when compared to galaxies in cluster environments. Our results suggest that: (1) in both high- and low-density environments, the mass of the host galaxy has the dominant effect on GC system properties; (2) the local environment has only a secondary effect on the history of GC system formation; and (3) GC formation must be governed by common physical processes across a range of environments
Electronic structures of ZnCoO using photoemission and x-ray absorption spectroscopy
Electronic structures of ZnCoO have been investigated using
photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). The
Co 3d states are found to lie near the top of the O valence band, with a
peak around eV binding energy. The Co XAS spectrum provides
evidence that the Co ions in ZnCoO are in the divalent Co
() states under the tetrahedral symmetry. Our finding indicates that the
properly substituted Co ions for Zn sites will not produce the diluted
ferromagnetic semiconductor property.Comment: 3 pages, 2 figure
Kaposi's Sarcoma-Associated Herpesvirus-Related Solid Lymphoma Involving the Heart and Brain
Since its discovery
in 1994, Kaposi's sarcoma-associated
herpesvirus (KSHV) has been associated with
lymphoproliferative disorders, particularly in
patients infected with human immunodeficiency
virus (HIV). The disorders most strongly linked
to KSHV are multicentric Castleman's Disease
(MCD), primary effusion lymphoma, and diffuse
large B-cell lymphomas. We report an unusual
case of KSHV-associated lymphoma in an
HIV-infected patient manifesting with myocardial
and central nervous system involvement. We
discuss this case in the context of increasing
array of KSHV-associated lymphomas. In the
HIV-infected patient with a mass lesion, a
history of cutaneous Kaposi's sarcoma and
prolonged immunosuppression should alert
clinicians as to the possibility of
KSHV-associated lymphoproliferative disorders,
in order to establish a timely
diagnosis
Seed-layer mediated orientation evolution in dielectric Bi-Zn-Ti-Nb-O thin films
Highly (hhh) -oriented pyrochlore Bi-Zn-Ti-Nb-O (BZTN) thin films were fabricated via metal-organic decomposition using orientation template layers. The preferred orientation was ascribed to the interfacial layer, the lattice parameter of which is similar to BZTN. High-resolution transmission electron microscopy supported that the interfacial layer consists of Bi and Pt. The (hhh) -oriented thin films exhibited a highly insulating nature enabling feasible applications in electronic devices, particularly voltage tunable application. The BZTN thin films did not show any apparent dielectric anisotropy and the slightly enhanced dielectric properties were discussed in connection to the internal stress and the grain boundary effect. Ā© 2007 American Institute of Physics
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