Tetra­kis[1-phenyl-3-(1H-1,2,4-triazol-1-yl)propan-1-one-κN 4]bis­(thio­cyanato-κN)nickel(II)

In the centrosymmetric mononuclear title complex, [Ni(NCS)2(C11H11N3O)4], the NiII atom, located on an inversion centre, is hexa­coordinated in a distorted octa­hedral geometry comprising four N atoms of four monodentate 1-phenyl-3-(1H-1,2,4-triazol-1-yl)propan-1-one ligands and two N atoms from thio­cyanate anions

Reevaluation of the density dependence of nucleon radius and mass in the global color symmetry model of QCD

With the global color symmetry model (GCM) at finite chemical potential, the density dependence of the bag constant, the total energy and the radius of a nucleon in nuclear matter is investigated. A relation between the nuclear matter density and the chemical potential with the action of QCD being taken into account is obtained. A maximal nuclear matter density for the existence of the bag with three quarks confined within is given. The calculated results indicate that, before the maximal density is reached, the bag constant and the total energy of a nucleon decrease, and the radius of a nucleon increases slowly, with the increasing of the nuclear matter density. As the maximal nuclear matter density is reached, the mass of the nucleon vanishes and the radius becomes infinite suddenly. It manifests that a phase transition from nucleons to quarks takes place.Comment: 18 pages, 3 figure

Exact periodic cross-kink wave solutions for the (2+1)-dimensional Boiti-Leon-Manna-Pempinelli equation

Based on the extended homoclinic test technique and the Hirota’s bilinear method, the (2+1)-dimensional Boiti-Leon-Manna-Pempinelli equation is investigated which describes the fluid propagating and can be considered as a model for an incompressible fluid. With the aid of symbolic computation, we introduce two new Ansätz functions to discuss the multiple periodic-soliton solutions of the (2+1)-dimensional Boiti-Leon-Manna-Pempinelli equation. Some entirely new periodic-soliton solutions are presented. The figures corresponding to these solutions are illustrated to show abundant physics structures

catena-Poly[[bis­[3-(1H-imidazol-1-yl)-1-phenyl­propan-1-one-κN 3]nickel(II)]-μ-oxalato-κ4 O 1,O 2:O 1′,O 2′]

In the title compound, [Ni(C2O4)(C12H12N2O)2]n, the NiII atom, lying on a twofold rotation axis, is coordinated by two N atoms from two monodentate 3-(1H-imidazol-1-yl)-1-phenyl­propan-1-one (L) ligands and four O atoms from two oxalate anions in a distorted octa­hedral geometry. The oxalate anion has a twofold rotation axis through the mid-point of the C—C bond and acts as a bridging ligand, linking the NiII atoms into a polymeric chain along [010]. Weak inter­molecular C—H⋯O hydrogen bonds connect the chains, resulting in a three-dimensional supra­molecular structure.

直肠脱垂病因探讨 ——直肠脱垂是一种盆底解剖异常的先天性疾病

Etiology of rectal prolapse is unclear. “Theory of sliding hernia” and “theory of intussusception” can not entirely interpret the etiology of rectal prolapse. Our views: the basic reason of rectal prolapse is congenital anomaly of anterior wall muscle of rectum, we named “trigger point”. Abdominal pressure can stimulate to shrink of “trigger point” and result in rectal prolapse.Operation confirmed that suture and fixation of “trigger point” tissue would be cured for rectal prolapse.直肠脱垂发病原因不清，直肠脱垂发病的“滑动疝学说”和“肠套叠学说”不能完全阐释直肠脱垂的发生。笔者的观点认为直肠脱垂发生的根本原因是直肠前壁肌层存在先天异常，在接受腹腔压力刺激时可产生凹陷性收缩，发生直肠脱垂，笔者将异常的直肠前壁组织命名为“扳机点”，通过开腹手术证实将“扳机点”组织缝合固定即可治疗直肠脱垂

Di-μ-acetato-κ4 O:O-bis­{(acetato-κ2 O,O′)bis­[3-(1H-imidazol-1-yl-κN 3)-1-phenyl­propan-1-one]cadmium} tetra­hydrate

In the mol­ecular structure of the title neutral binuclear complex, [Cd2(C2H3O2)4(C12H12N2O)4]·4H2O, each CdII atom is six-coordinated and exhibits a distorted octa­hedral geometry. Three O atoms from two acetate ions and one monodentate 3-(1H-imidazol-1-yl-κN 3)-1-phenyl­propan-1-one (L) ligand form the equatorial plane, while the bridging-O atom forming the longer Cd—O distance,and the N atom of the second L ligand, forming the longer Cd—N distance, occupy axial positions with an N—Cd—O angle of 170.77 (7)°. Inter­molecular O—H⋯O hydrogen bonds exist between the lattice water mol­ecules and the acetate ions of adjacent mol­ecules, resulting in a two-dimensional supra­molecular structure

The progestin levonorgestrel affects sex differentiation in zebrafish at environmentally relevant concentrations

Synthetic progestins have become widespread environmental contaminants and may cause adverse effects on fish. In the present study, we investigated the effects of levonorgestrel (LNG) on sex differentiation in zebrafish (Danio rerio). Embryos were exposed to LNG at environmentally relevant concentrations (0, 1, 10, 33, and 100 ng/L) and allowed to develop until sexual maturity. Histological examination at 63 days post fertilization (dpf) caused complete sex reversal and 100% males were observed in the 10,33 and 100 ng/L treatments; gross morphological and histological examination of gonads at 142 dpf further confirmed 100% males at these exposure concentrations. The results indicate androgenic activity of LNG, and masculinization during zebrafish gonadal differentiation. The mRNA expression levels of genes involved in fish sex differentiation and gonadal development were examined at 28 and 42 dpf. Down-regulation of the mRNA expression of aromatase (e.g., cyp19a1 a, cyp19a1b), the forkhead transcription factor gene L2 (foxl2) and the Fushi tarazu factor-1d (nr5a1b) were observed. In contrast, transcription of the doublesex and mab-3-related transcription factor 1 (dmrt1) gene was up-regulated. Androgen receptor (ar) mRNA expression was significantly down-regulated at 28 and 42 dpf. Co-exposure to flutamide (an androgen antagonist) and LNG, led to a decrease in the sex inversion potency of LNG. Our study has demonstrated that environmentally relevant concentrations of LNG could alter sex differentiation and gonadal development in zebrafish. Our results also suggest a potentially high ecological risk of LNG to fish populations in LNG-contaminated aquatic environments. (C) 2015 Elsevier B.V. All rights reserved

Aqua­(benzene-1,2-dicarboxyl­ato-κO)bis­[2-(1H-pyrazol-3-yl-κN 2)pyridine-κN]cadmium(II)

In the mononuclear title complex, [Cd(C8H4O4)(C8H7N3)2(H2O)], the CdII atom is six-coordinated in a distorted octa­hedral geometry by four N atoms from two bidentate chelating 2-(1H-pyrazol-3-yl)pyridine ligands, one O atom from a benzene-1,2-dicarboxyl­ate ligand and one water mol­ecule. The mol­ecular structure features intra­molecular O—H⋯O and N—H⋯O hydrogen bonds. In the crystal structure, the complex mol­ecules are assembled into a two-dimensional supra­molecular layer parallel to (011) via O—H⋯O and N—H⋯O hydrogen bonds and π–π stacking inter­actions between the pyridyl and pyrazole rings [centroid–centroid distances = 3.544 (2) and 3.722 (3) Å]