Volatility of Tax Payments and Dividend Payouts.

Dividends are a key mechanism for shareholders to discipline managers and mitigate agency conflicts. This study examines whether the volatility of tax payments is associated with dividend payouts. Consistent with the predictions, results suggest that firms with more volatile tax payments are less likely to pay dividends overall and their dividends are lower in magnitude when doing so.

Endovascular port-a-cath rescue in acute thrombotic superior vena cava syndrome.

Acute superior vena cava (SVC) syndrome is managed by endovascular recanalization, venoplasty with stenting, and anticoagulation. It is often associated with central venous catheters. We present a case of a 55-year-old woman with acute SVC syndrome due to port-a-cath-associated thrombosis of the SVC and the brachiocephalic and subclavian veins who was treated with catheter-based thrombectomy and local spray thrombolysis, venoplasty, and stent placement.

Electronic structures of organometallic complexes of f elements LXXXIII: First comparison of experimental and calculated (on the basis of density functional theory) polarized Raman spectra of an oriented organometallic single crystal: Tris(pentamethylcyclopentadienyl)lanthanum.

The polarized Raman spectra of an oriented La(η(5)-C5Me5)3 (1) single crystal (where the principal axes of the two molecules per unit cell are uniformly oriented) as well as the mid (ca. 90K) and far infrared spectra of pellets have been recorded. Applying the selection rules of C3h symmetry to the spectra obtained, the irreducible representations (irreps) of numerous lines/bands of intra-ligand character were derived.

Electronic structures of organometallic complexes of f elements LXXXII: comparison of assigned experimental and calculated (on the basis of density functional theory) frequencies of normal vibrations of the first homoleptic organometallic complex of the lanthanides: tris(η(5)-tetramethylcyclopentadienyl)lanthanum.

The far and mid infrared spectra of powdered La(η(5)-C5Me4H)3 as well as polarized Raman spectra of an oriented single crystal (where the principal axes of the two molecules per unit cell are uniformly oriented) have been recorded. Applying the selection rules of C3h symmetry to the experimental data, numerous signals were assigned which agree well with the predictions of a calculation based on density functional theory. Neglecting νC-H and γCp-H (out of plane) modes, an r.

Electronic structures of organometallic complexes of f elements LXXVI: Correlation of experimental and calculated (on the basis of density functional theory) vibrational spectra of bis(η5-cyclopentadienyl)ruthenium and bis(η5-pentamethylcyclopentadienyl)ruthenium.

Previous empirical assignments of the normal modes of Ru(η(5)-C(5)H(5))(2) were checked against the results of a calculation applying density functional theory (DFT). After some reassignments, following those recently suggested for Fe(η(5)-C(5)H(5))(2) (after theoretical model calculations), a satisfactory agreement was observed. Recently communicated polarized Raman spectra of an oriented Ru(η(5)-C(5)Me(5))(2) single crystal were used here for the identification of the irreducible representations of a number of Raman active normal modes (assuming molecular D(5h) symmetry) which agree well with the results of the DFT calculation.

Parametric analysis of the crystal field splitting pattern of Sm(eta(5)-C(5)Me(5))(3) derived on the basis of absorption spectra of pellets or solutions and electronic raman spectra of oriented single crystals.

By comparing the absorption spectrum of pseudo trigonal planar Sm(eta(5)-C(5)Me(5))(3) (1) (KBr pellet, methylcyclohexane solution) with the previously assigned one of Sm(eta(5)-C(5)Me(4)H)(3) (2) a truncated experimental crystal field (CF) splitting pattern of the former compound could be derived in the NIR range. Because of its dark brown color, fluorescence is not observed from complex 1, and thus the CF splitting pattern in the low energy range could not be determined on the basis of luminescence measurements. However, comparing the FIR and MIR spectra (pellets) as well as the Raman spectra of oriented single crystals of 1 with those of La(eta(5)-C(5)Me(5))(3) (3) at least two additional CF levels could be detected.

Synthesis, molecular, and electronic structure of (eta(8)-C8H8)Ln(scorpionate) half-sandwich complexes: an experimental key to a better understanding of f-element-cyclooctatetraenyl bonding.

Synthetic routes leading to two series of (eta(8)-cyclooctatetraenyl)lanthanide(III) scorpionate "mixed sandwich" complexes are reported. The early lanthanide derivatives (COT)Ln(Tp) (Ln = Ce (1), Pr (2), Nd (3), Sm (4)) and (COT)Ln(Tp(Me2)) (Ln = Ce (5), Pr (6), Nd (7), Sm (8)) (COT = eta(8)-cyclooctatetraenyl, Tp = hydrotris(pyrazolyl)borate, Tp(Me2) = hydrotris(3,5-dimethylpyrazolyl)borate) were obtained by reacting the dimeric halide precursors [(COT)Ln(mu-Cl)(THF)]2 with K[Tp] or K[Tp(Me2)], respectively For the late lanthanide elements a different synthetic route was developed. The complexes (COT)Ln(Tp) (Ln = Er (9), Lu (10)) were made by the reaction of (Tp)LnCl2(THF)1.

[Electronic structures of organometallic complexes of f elements. Part 54. Electronic Raman and f-f transitions in the low temperature vibrational spectra of Cp3Ce(NCCH3)2].

A comparison of the low temperature Raman spectra of Cp(3)Ce(NCCH(3))(2) (1), Cp(3)La(NCCH(3))(2) (2), Cp(3)La(NCCH(3))(2):Pr(3+) (3), Cp(3)La x NCCH(3) (4), Cp(3)Ce x NCCH(3) (5) and Cp(3)Tb x NCCH(3) (6) shows that the former compound exhibits three additional bands at 320, 2129 and 2154 cm(-1), which we ascribe to electronic Raman transitions. The two latter signals also appear in the low temperature IR spectrum of complex 1, but not in those of compounds 2-6. By performing crystal field (CF) calculations, the terminal states of the observed electronic Raman transitions could be identified.

[Electronic structure of the high symmetrical compounds of f-element. Part 33. A novel experimental crystallized trigonal-bipyramidal coordinated lanthanide(III) systems: Pr[N(SiMe3)2](CNR)2 (R = tBu, C6H11)].

The absorption und magnetic circular dichroism spectra of the dissolved trigonal-bipyramidal complex Pr[N(SiMe3)2]3(CNtBu)2 (1) as well as the luminescence and absorption spectra of both solid 1 and solid Pr[N(SiMe3)2]3(CNC6H11)2 (2) (pellets, unoriented single crystals) were measured at ambient and low temperatures. Because of the violation of the selection rules for D3h symmetry by both compounds a reliable crystal field(CF) splitting pattern for the ground manifold 3H4, but only a plausible for the f 2 configuration could be derived on the basis of these measurements. The latter could be simulated with a reduced r.

Different autochthonous models of colorectal cancer in the rat.

Chemically induced (autochthonous) tumors in the rodent are thought to be the best models at hand to obtain results transferable to the clinical situation. Four different autochthonous tumor models: 1,2-dimethylhydrazine, N-methylnitrosourea (MNU), N-methyl-N-nitro-nitrosoguanidine (MNNG), and N-nitroso-acetoxymethyl-methylamine (AMMN) which are used worldwide for etiological and therapy studies of colon cancer are compared for tumor biology and clinical relevance. The four tumor models of colon carcinoma described in the rat are different in growth, invasion, and metastases.

[Naftidrofuryl in arterial occlusive disease. Controlled multicenter double-blind study with oral administration].

The efficacy of naftidrofuryl ( Dusodril ) for treatment of stage II arterial occlusive disease was evaluated in a controlled multi-centre study in a total of 104 out-patients with angiographically documented localization of occlusion. The therapeutic effect was assessed over three months by measurements of walking distance using standardized treadmill conditions. Further parameters were venoocclusive plethysmography and Doppler ultrasonography measurement of pressures.

[Treatment of Stewart-Treves syndrome].

The Stewart-Treves syndrome is the most dangerous complication of chronic lymphedema following mastectomy. Prognosis is poor. In the world literature 278 cases are described.

[Diagnosis and therapy of lateral ligament rupture of the upper ankle joint].

Symptoms, diagnosis and therapy of the ligaments at the malleolus lateralis are demonstrated. It is only the x-ray examination in fixed talar drawer position that enables exclusion of an instability with certainty. Hence, we may infer that every distorsion of the articulation must be x-rayed in talar drawer position to make sure that no rupture of the ligaments is omitted.

Chemotherapeutic studies on N-nitrosoacetoxymethyl-methylamine-and 1,2-dimethylhydrazine-induced colonic tumors in rats: monotherapy with 5-fluorouracil, ftorafur, CGP 6809, and CGP 15'720A.

Colonic tumors were induced in male Sprague-Dawley rats by ten applications of 2 mg/kg/week N-nitrosoacetoxymethyl-methylamine (AMMN) or by three applications of 100 mg/kg/month 1,2-dimethylhydrazine (1,2-DMH). Application of AMMN and 1,2-DMH induced selective colonic tumors in 97% and 29-42% of the initial animals, respectively. Colonic-tumor-bearing animals were subjected to monotherapy with 5-fluorouracil, ftorafur, CGP 6809, and CGP 15'720A.

Endoscopic diagnosis of chemically induced autochthonous colonic tumors in rats.

The suitability of using coloscopy as a diagnostic method is investigated with respect to colonic carcinomas induced locally by the administration of N-nitrosoacetoxymethyl-methylamine, N-methyl-N-nitrosourea, and methylnitro-nitrosoguanidine, or systemically by subcutaneous injection of 1,2-dimethylhydrazine in Sprague-Dawley rats. The endoscopic diagnostic examination proved to be clearly superior to methods of animal inspection, palpation, investigation for occult blood and exploratory laparotomy which have so far been employed in animal experiments with small rodents. The relevance of this method is discussed for the early detection of chemically induced colonic tumors, and the observation of tumor development under experimental cytostatic therapy.

[Anti-oestrogen treatment of metastasising carcinoma of the breast (author's transl)].

Within a period of four years 35 patients with metastatic breast cancer were treated with tamoxifen. One third had objective remissions, average duration of complete remission being 30.6 months and of partial remission 13.