683 research outputs found
Orbital density wave induced by electron-lattice coupling in orthorhombic iron pnictides
In this paper we explore the magnetic and orbital properties closely related
to a tetragonal-orthorhombic structural phase transition in iron pnictides
based on both two- and five-orbital Hubbard models. The electron-lattice
coupling, which interplays with electronic interaction, is self-consistently
treated. Our results reveal that the orbital polarization stabilizes the spin
density wave (SDW) order in both tetragonal and orthorhombic phases. However,
the ferro-orbital density wave (F-ODW) only occurs in the orthorhombic phase
rather than in the tetragonal one. Magnetic moments of Fe are small in the
intermediate Coulomb interaction region for the striped antiferromangnetic
phase in the realistic five orbital model. The anisotropic Fermi surface in the
SDW/ODW orthorhombic phase is well in agreement with the recent angle-resolved
photoemission spectroscopy experiments. These results suggest a scenario that
the magnetic phase transition is driven by the ODW order mainly arising from
the electron-lattice coupling.Comment: 21 pages, 10 figure
1-Cyano-N-(2,4,5-trichlorophenyl)cyclopropane-1-carboxamide
In the title compound, C11H7Cl3N3O, the dihedral angle between the benzene and cyclopropane rings is 85.8 (2)°. In the crystal, molecules are linked by C—H⋯O interactions, generating C(5) chains propagating in the a-axis direction
(E)-(4-Bromobenzylidene)amino cyclopropanecarboxylate
In the title compound, C11H10BrNO2, the dihedral angle between the benzene and cyclopropane ring planes is 49.4 (3)°. The C—C—N—O torsion angle is −175.1 (3)°, which indicates that the C=N double bond is in the E configuration
Synchronous Gastric Carcinoma and Nodal Malignant Lymphoma: A Rare Case Report and Literature Review
Synchronous double malignancies of gastric carcinoma (GC) and malignant lymphoma (ML) are rare and very difficult to treat. We report a case of synchronous GC and nodal ML, regarding which clinical and pathological features and treatment are discussed. A 68-year-old woman with a history of inguinal hernia was admitted for abdominal pain and high fever and subsequently underwent herniorrhaphy, but the fever remained. Computerized tomography showed a stomach mass and multiple enlarged lymph nodes in the abdominal cavity and inguinal regions. Gastric adenocarcinoma coexistent with advanced in situ follicular lymphoma was confirmed by endoscopy, biopsy of inguinal lymph nodes and bone marrow examination. Two chemotherapy regimens, R-CHOP (rituximab, cyclophosphamide, perarubicin, vincristine and prednisone) and systemic therapy (5-fluorouracil and calcium folinate) combined with regional perfusion (oxaliplatin and etoposide) through the left gastric artery were performed at intervals against ML and GC, respectively. Partial remission in both tumors was achieved after 4 courses of treatment, but the patient finally died of heart failure. Scrupulous biopsy of non-draining lymph nodes in patients with gastrointestinal carcinomas is supposed to improve the diagnostic rate of simultaneous nodal ML. The interval chemotherapy strategy with two independent regimens is beneficial for such patients, especially for those unable to tolerate major surgery
catena-Poly[[(5-carboxy-2H-1,2,3-triazole-4-carboxylato-κ2 N 3,O 4)sodium]-di-μ-aqua-κ4 O:O]
In the title coordination polymer, [Na(C4H2N3O4)(H2O)2]n, the NaI atom is six-coordinated by one O atom and one N atom from a 2H-1,2,3-triazole-4-carboxy-5-carboxylate ligand and four O atoms from four water molecules, forming a distorted octahedal geometry. The NaI atoms are bridged by water molecules into a chain structure along [100]. Intermolecular N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds connect the chains. An intramolecular O—H⋯O hydrogen bond between the carboxylate groups is observed
(Z)-3-[(4-Ethoxyphenyl)(hydroxy)methylidene]-1-isopropylpyrrolidine-2,4-dione
In the title compound, C16H19NO4, a potent new herbicide, the dihedral angle between the benzene and pyrrolidine rings is 11.09 (8)°. Intramolecular O—H⋯O and C—H⋯O hydrogen bonds are observed
- …