Observation of highly stable and symmetric lanthanide octa-boron inverse sandwich complexes.

While boron forms a wide range of metal borides with important industrial applications, there has been relatively little attention devoted to lanthanide boride clusters. Here we report a joint photoelectron spectroscopy and quantum chemical study on two octa-boron di-lanthanide clusters, LnB (Ln = La, Pr). We found that these clusters form highly stable inverse sandwich structures, [Ln-B-Ln], with strong Ln and B bonding via interactions between the Ln 5d orbitals and the delocalized σ and π orbitals on the B ring.

[Diagnostic efficacy of 99Tcm-MIBI SPECT/CT and 18F-FDG coincidence SPECT/CT for solitary pulmonary nodules: a comparative study].

Objective: To compare the diagnostic accuracy of (99)Tc(m)-MIBI SPECT/CT and (18)F-FDG coincidence SPECT/CT for solitary pulmonary nodules.

Methods: A total of 88 cases suspected of solitary pulmonary nodules were analyzed retrospectively, of whom 36 were examined with (18)F-FDG coincidence SPECT/CT and 52 with (99)Tc(m)-MIBI SPECT/CT. The nature of the solitary pulmonary nodules (malignant or benign) were determined according to the pathological or follow-up (>2 years) results.

How Much Can Density Functional Approximations (DFA) Fail? The Extreme Case of the FeO4 Species.

A thorough theoretical study of the relative energies of various molecular Fe·4O isomers with different oxidation states of both Fe and O atoms is presented, comparing simple Hartree-Fock through many Kohn-Sham approximations up to extended coupled cluster and DMRG multiconfiguration benchmark methods. The ground state of Fe·4O is a singlet, hexavalent iron(VI) complex (1)C2v-[Fe(VI)O2](2+)(O2)(2-), with isomers of oxidation states Fe(II), Fe(III), Fe(IV), Fe(V), and Fe(VIII) all lying slightly higher within the range of 1 eV. The disputed existence of oxidation state Fe(VIII) is discussed for isolated FeO4 molecules.

Stress- and pathogen-induced Arabidopsis WRKY48 is a transcriptional activator that represses plant basal defense.

Plant WRKY transcription factors can function as either positive or negative regulators of plant basal disease resistance. Arabidopsis WRKY48 is induced by mechanical and/or osmotic stress due to infiltration and pathogen infection and, therefore, may play a role in plant defense responses. WRKY48 is localized to the nucleus, recognizes the TTGACC W-box sequence with a high affinity in vitro and functions in plant cells as a strong transcriptional activator.

Study of 99mTc-TRODAT-1 imaging on human brain with children autism by single photon emission computed tomography.

To evaluate the application values ofTc-2 β [N, N′ , - bis (2-mercaptoethy1) ethylenediamino] methyl, 3 β -(4-chlorophenyl) tropane (TRODAT-1) dopamine transporter (DAT) SPECT imaging in children autism, and offer the academic foundation to etiology, mechanism and clinical therapy of autism. Ten autistic children and ten healthy controls were examined with 99mTc-TRODAT-1 DAT SPECT imaging. Striatal specific uptake of 99mTc-TRODAT-1 was calculated with region of interest analysis according to the ratios between striatum and cerebellum [(STR-BKG)/BKG].