Internal Bremsstrahlung accompanying non-unique second-forbiddenβ-decay of36CL

The inner Bremsstrahlung spectrum (I.B.) associated wih the non-unique second forbidden-transition of³⁶Cl was measured using a single channel NaI (Tl) scintillation spectrometer. After making all the necessary corrections, the experimental results were compared with the corresponding theoretical distributions due to the KUB, Lewis and Ford, Nilsson, Ford and Martin and Chang and Falkoff. Also a comparison with those calculated according to Nilsson theory after applying the shape correction factor (M. KUB) was done. The measured spectrum is found to show fairly good agreement with M. KUB theory and its found to deviate therafter from all five theories.The authors would like to thank Prof. Dr. M. El-Nadi and Prof. Dr. O.E. Badawy for their suggestions, interest and encouragement.     

Diode array detection for stability assessment and evaluation of degradation kinetics of newly introduced sacubitril in its supramolecular complex (LCZ696) with valsartan

A newly FDA-approved heart failure therapy (LCZ696, supramolecular complex of sacubitril (SAC) and valsartan (VAL), Entresto?) is analyzed with a stability indicating HPLC–DAD method. For the newly introduced drug, SAC, there is no sufficient information about its stability under various stress conditions. The proposed chromatographic method was applied to the kinetic investigation of the acidic, alkaline, and oxidative degradation of SAC with the estimation of its activation energy and half-life at room temperature by the aid of Arrhenius plots. Kinetic investigation was conducted using either different strengths of HCl, NaOH, and H₂O₂ at one selected temperature or different temperature degrees at one selected reagent strength, for the acidic, alkaline, and oxidative stress conditions. It was found that the pseudo-first-order kinetics was followed at each case. The half-lives at room temperature using 0.1?M HCl, 0.01?M NaOH, and 15% H₂O₂ were found to be 20.50, 2.76, and 51.58?hr. The chromatographic method was achieved using Zorbax Eclipse plus-C18 (4.6?×?250?mm, 5?µm) with isocratic elution of mobile phase composed of acetonitrile and 0.025?M phosphate buffer (pH3) in a ratio of 60:40 (v/v).     

DNA/bovine serum albumin binding and cytotoxicity of transition metal ternary complexes based on sulfamethazine and bromazepam drugs

Similar to the antibiotic mixing strategies, which depend on reducing the worth of diffusion of the resistant bacteria to new host, in this contribution, we explicit new mixed-ligand complexes of the type [M(SMZ)₂(BZM)] (M = Co(II), Ni(II) and Cu(II)) based on two drugs: sulfamethazine (SMZ) and bromazepam (BZM). The novelty aspect of the present work relies on combining two drugs in a single molecule via the synthesis of the ternary complexes. The ternary complexes were characterized by spectroscopic and analytical tools with the aid of the quantum chemical calculations. Copper(II) complex has the highest DNA intrinsic binding constant (2.20 × 10⁵ M⁻¹), induces extensively DNA cleavage compared to the other complexes, and exhibits the highest cytotoxicity (IC₅₀ = 0.67 μM) against human liver cancer cell line (HepG2). Exciting, Cu(II) compound exhibits no toxicity to the nonmalignant human foetal lung fibroblast (WI-38). Alternatively, the low cytotoxicity of the Co(II) complex correlates well with the high affinity of the compound to human serum albumin (K_b = 4.58 × 10⁵) compared to 1.93 × 10⁵ and 2.14 × 10⁵ M⁻¹ for Ni (II) and Cu (II) complexes, respectively.     

12-O-acetylphorbol-13-decanoate potently inhibits cytopathic effects of human immunodeficiency virus type 1 (HIV-1), without activation of protein kinase C.

Through bioactivity-guided fractionation, eight phorbol diesters, including five new ones (1-5), were isolated from the seeds of Croton tiglium collected in Egypt. 12-O-Acetylphorbol-13-decanoate (6) and 12-O-decanoylphorbol-13-(2-methylbutyrate) (4) potently inhibited the HIV-1-induced cytopathic effect on MT-4 cells (IC100 values of 7.6 ng/ml and 7.81 micrograms/ml, and CC0 values of 62.5 micrograms/ml and 31.3 micrograms/ml, respectively) without activating protein kinase C.     

Biotransformation of a C-glycosylflavone, abrusin 2''-O-beta-D-apioside, by human intestinal bacteria

After anaerobic incubation of abrusin 2'-O-beta-D-apioside (1) with a human fecal suspension, five metabolites were isolated and identified as abrusin (2), 1-(2',6'-dihydroxy-3',4'-dimethoxyphenyl)-3-(4'-hydroxyphenyl)propan-1- one (5), 5,6-dimethoxybenzene-1,3-diol (6), 3-(4'-hydroxyphenyl)propionic acid (7) and 3-phenylpropionic acid (8). However, methyl ether derivatives of abrusin (4'-O-methylabrusin and 4'-O-, 5-O-dimethylabrusin) resisted degradation under the same conditions.     

Linear relations betweenE-functions and Bessel functions

In this paper, some new linear relations for MacRobert'sE-Functions are established. They are formulae (1), (10), (15), (20), (22) and (28) below. For the definitions and properties of these functions, the reader is referred to MacRobert, “Functions of a Complex Variable” (3rd ed., London 1946), p. 348. This work will be denoted by the letters C.V. Also some expansions of Bessel Functions are deduced.