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The anticancer activity of titanium complexes has been known since the groundbreaking studies of Köpf and Köpf-Maier on titanocen dichloride. Unfortunately, possibly due to their fast hydrolysis, derivatives of titanocen dichloride failed in clinical studies. Recently, the new family of titanium salan complexes containing tetradentate ONNO ligands with anti-cancer properties has been discovered. These salan complexes are much more stabile in aqueous media. In this study we describe the biological activity of two titanium salan complexes in a mouse model of cervical cancer. High efficiency of this promising complex family was demonstrated for the first time in vivo. From these data we conclude that titanium salan complexes display very strong antitumor properties exhibiting only minor side effects. Our results may influence the chemotherapy with metallo therapeutics in the future.
Chelate stabilization of a titanium(IV)–salan alkoxide by ligand exchange with 2,6-pyridinedicarboxylic acid (dipic) resulted in heptacoordinate complex 3 which is not redox-active, stable on silica gel and has increased aqueous stability. 3 is highly toxic in HeLa S3 and Hep G2 and has enhanced antitumor efficacy in a mouse cervical-cancer model.
Meiotic functions of RAD18
(2011)
The Monte Carlo code FLUKA is used to simulate the production of a number of positron emitting radionuclides, ¹⁸F, ¹³N, ⁹⁴Tc, ⁴⁴Sc, ⁶⁸Ga, ⁸⁶Y, ⁸⁹Zr, ⁵²Mn, ⁶¹Cu and ⁵⁵Co, on a small medical cyclotron with a proton beam energy of 13 MeV. Experimental data collected at the TR13 cyclotron at TRIUMF agree within a factor of 0.6 ± 0.4 with the directly simulated data, except for the production of ⁵⁵Co, where the simulation underestimates the experiment by a factor of 3.4 ± 0.4. The experimental data also agree within a factor of 0.8 ± 0.6 with the convolution of simulated proton fluence and cross sections from literature. Overall, this confirms the applicability of FLUKA to simulate radionuclide production at 13 MeV proton beam energy.
An acetoin biosensor based on a capacitive electrolyte–insulator–semiconductor (EIS) structure modified with the enzyme acetoin reductase, also known as butane-2,3-diol dehydrogenase (Bacillus clausii DSM 8716ᵀ), is applied for acetoin detection in beer, red wine, and fermentation broth samples for the first time. The EIS sensor consists of an Al/p-Si/SiO₂/Ta₂O₅ layer structure with immobilized acetoin reductase on top of the Ta₂O₅ transducer layer by means of crosslinking via glutaraldehyde. The unmodified and enzyme-modified sensors are electrochemically characterized by means of leakage current, capacitance–voltage, and constant capacitance methods, respectively.
Differentiation between Phaeocystis pouchetii (Har.) Lagerheim and Phaeocystis globosa Scherffel
(1987)
Denk- und Lernspielzeug : Offenlegungsschrift : DE 102006003433 A1 ; Offenlegungstag: 26.07.2007
(2007)
The contribution of altered post-transcriptional gene silencing to the development of insulin resistance and type 2 diabetes mellitus so far remains elusive. Here, we demonstrate that expression of microRNA (miR)-143 and 145 is upregulated in the liver of genetic and dietary mouse models of obesity. Induced transgenic overexpression of miR-143, but not miR-145, impairs insulin-stimulated AKT activation and glucose homeostasis. Conversely, mice deficient for the miR-143–145 cluster are protected from the development of obesity-associated insulin resistance. Quantitative-mass-spectrometry-based analysis of hepatic protein expression in miR-143-overexpressing mice revealed miR-143-dependent downregulation of oxysterol-binding-protein-related protein (ORP) 8. Reduced ORP8 expression in cultured liver cells impairs the ability of insulin to induce AKT activation, revealing an ORP8-dependent mechanism of AKT regulation. Our experiments provide direct evidence that dysregulated post-transcriptional gene silencing contributes to the development of obesity-induced insulin resistance, and characterize the miR-143–ORP8 pathway as a potential target for the treatment of obesity-associated diabetes.
Design of enzyme reactors as chromatographic columns for racemic resolution of amino acid esters
(1989)
Mannoheptulose is a seven-carbon sugar. It is an inhibitor of glucose-induced insulin secretion due to its ability to selectively inhibit the enzyme glucokinase. An improved procedure for mannoheptulose isolation from avocados is described in this study (based upon the original method by La Forge). The study focuses on the combination of biotransformation and downstream processing (preparative chromatography) as an efficient method to produce a pure extract of mannoheptulose. The experiments were divided into two major phases. In the first phase, several methods and parameters were compared to optimize the mannoheptulose extraction with respect to efficiency and purity. In the second phase, a mass balance of mannoheptulose over the whole extraction process was undertaken to estimate the yield and efficiency of the total extraction process. The combination of biotransformation and preparative chromatography allowed the production of a pure mannoheptulose extract. In a biological test, the sugar inhibited the glucokinase enzyme activity efficiently.
Humanized UGT2 and CYP3A transchromosomic rats for improved prediction of human drug metabolism
(2019)
Obesity-induced overexpression of miR-802 impairs glucose metabolism through silencing of Hnf1b
(2013)
Partielle Oxidation von o-Xylol zu Phthalsäureanhydrid in einem strukturierten Festbettreaktor
(1991)
Der effektive Diffusionskoeffizient Deff von Gasen in einem porösen Medium hängt im Knudsen- bzw. Übergangsgebiet vom effektiven Porenradius 〈r〉 der Struktur ab. 〈r〉 kann aus Deff ermittelt werden, sofern der Labyrinthfaktor χ der Struktur aus der Kinetik des Stoffaustausches in den mit einer flüssigen Phase gefüllten Poren separat bestimmt wird. An einem Trägerkatalysator (CuO auf γ-Al₂O₃) ergab sich auf diese Weise ein für die Diffusion maßgebender effektiver Porenradius, der in den Bereich der Makroporen fällt. Ein Vergleich mit dem aus reaktionskinetischen Daten ermittelten effektiven Diffusionskoeffizienten läßt auf eine ungleichmäßige Verteilung der aktiven Komponente im Kontaktkorn schließen.
Entfernung von Ammoniak aus Abwässern durch Strippung und Sorption an Zeolithen : [Synopse 1724]
(1989)
The performance of base metal oxides on ceramic carriers as catalysts for air pollution control
(1985)
Partielle Oxidation von o-Xylol zu Phthalsäreanhydrid an V/Ti-Schalenkatalysatoren : [Synopsis 1898]
(1990)
In der biopharmazeutischen Industrie werden rekombinante Proteine und monoklonale Antikörper in Zellkulturfermentationen produziert, da nur humane oder tierische Zelllinien über die Fähigkeit der Glykosylierung verfügen. Um hohe Produktausbeuten in ausgezeichneter Qualität zu erzielen, ist eine funktionstüchtige Prozesskontrolle unerlässlich. Hierzu wurde in Kooperation mit der Firma Hitec Zang GmbH die HiSense Präzisionsabgasanalytik entwickelt, die auf Basis der vollautomatischen Ermittlung des Respirationsquotienten (RQ; Verhältnis vonKohlendioxidbildungsrate (CER) zu Sauerstoffaufnahmerate (OTR)) einen Fermentationsprozess nicht-invasiv überwacht. Der RQ kann in Hybridoma- und CHO-Zellen (s. Abb.) in sowohl serumhaltigen als auch serumfreien Medien erfolgreich ermittelt werden. Hier spiegeln die CER und die OTR das Wachstumsverhalten der kultivierten CHO-Zellen wider. Der RQ nimmt dabei Werte zwischen 0,9 und 1,2 an. Dies lässt auf verschiedene Stoffwechselaktivitäten schließen. Da die momentane industrielle Prozesskontrolle auf gemessenen Sauerstoffaufnahmeraten oder entsprechende Offline-Analytiken der Metaboliten basieren, soll durch die vollautomatische RQ-Ermittlung ein neues Verfahren zur Fermentationsüberwachung etabliert werden. Bisher war diese, in bakteriellen Kultivierungen standardisierte Methode, aufgrund der schwierigen CER-Berechnung bei Zellkulturen keine adäquate Alternative.
Lolium perenne (perennial ryegrass) is aproductive and high-quality forage grass indigenous to Southern Europe, temperate Asia, and North Africa. Nowadays it is widespread and the dominant grass species on green areas in temperate climates. This abundant source of biomass is suitable for the development of bioeconomic processes because of its high cellulose and water-soluble carbohydrate content. In this work, novel breeds of the perennial ryegrass are being examined with regards to their quality parameters and biotechnological utilization options within the context of bioeconomy. Three processing operations are presented. In the first process, the perennial ryegrass is pretreated by pressing or hydrothermal extraction to derive glucosevia subsequent enzymatic hydrolysis of cellulose. A yield of up to 82 % glucose was achieved when using the hydrothermal ex-traction as pretreatment. In a second process, the ryegrass is used to produce lactic acid in high concentrations. The influence of the growth conditions and the cutting time on the carboxylic acid yield is investigated. A yield of lactic acid of above 150 g kg⁻¹ dry matter was achieved. The third process is to use Lolium perenne as a substrate in the fermentation of K. marxianus for the microbial production of single-cell proteins. The perennial ryegrass is screw-pressed and the press juice is used as medium. When supplementing the press juice with yeast media components, a biomass concentration of up to 16 g L⁻¹ could be achieved.