Search results for "Effects"

Antiproliferative oleanane saponins from Polyscias guilfoylei

2008

Three new oleanane saponins (1–3), together with four known ones (4–7), were isolated from the aerial parts of Polyscias guilfoylei. Their structures were elucidated by 1D and 2D NMR experiments, including 1D TOCSY, DQF-COSY, ROESY, HSQC, and HMBC spectroscopy, as well as ESIMS analysis. The antiproliferative activity of all compounds was evaluated using three murine and human cancer cell lines; J774.A1, HEK-293, and WEHI-164. All the compounds were inactive except for 3β- O-[β-D-glucopyranosyl-(1→2)-α-L-arabinopyranosyl]-echinocystic acid 28-[ O-β-D-glucopyranosyl-(1→6) O-β-D-glucopyranosyl] ester (3), which was active against all the cell lines.

�ber die Rolle des Histamins bei der Verk�rzung der Blutungszeit nach Adrenalin

1955

Die Verkurzung der Blutungszeit nach Adrenalin konnte durch die Antihistaminica Casantin oder Luvistin sowohl aufgehoben als auch verhindert werden. Die Versuche sprechen dafur, das Histamin an der Verkurzung der Blutungszeit nach Adrenalin wesentlich beteiligt ist.

�ber Histamin als Mittlersubstanz bei der Wirkung von Adrenochrom als Aktivator von Reticuloendothelzellen

1955

In Bestatigung der Befunde von Jansco zeigt sich, das nach intracutaner Injektion von 25–50 γ Histamin in die Bauchhaut von Ratten eine Aktivierung des Gefasendothels eintritt. Intravenos injizierte Tusche wird von den Gefasendothelien an der Injektionsstelle des Histamins gespeichert.

PM441. Long term atypical antipsychotic treatment improves cognitive performance in schizophrenia but not surpassing conventional antipsychotic drugs…

2016

Cooperative phenomena and light-induced bistability in iron(II) spin-crossover compounds

1999

In iron(II) spin-crossover compounds, the transition from the 1A1 low-spin state at low temperatures to the 5T2 high-spin state at elevated temperatures is accompanied by a large increase in metal-ligand bond lengths. The resulting elastic interactions may be pictured as an internal pressure which is proportional to the concentration of the low-spin species. Because pressure stabilises the low-spin state relative to the high-spin state this results in a positive feedback. Thermal transition curves in neat iron(II) spin-crossover compounds are thus invariable much steeper than in diluted mixed crystals, and the high-spin→low-spin relaxation following the light-induced population of the high-…

Pharmacological Properties of Polyphenols: Bioavailability, Mechanisms of Action, and Biological Effects in In Vitro Studies, Animal Models, and Huma…

2021

Este artículo se encuentra disponible en la siguiente URL: https://www.mdpi.com/2227-9059/9/8/1074 Este artículo de investigación pertenece al número especial "Oxidative Stress and Inflammation: From Mechanisms to Therapeutic Approaches 2.0". Drugs are bioactive compounds originally discovered from chemical structures present in both the plant and animal kingdoms. These have the ability to interact with molecules found in our body, blocking them, activating them, or increasing or decreasing their levels. Their actions have allowed us to cure diseases and improve our state of health, which has led us to increase the longevity of our species. Among the molecules with pharmacological activity …

Moral Attitudes Toward Pharmacological Cognitive Enhancement (PCE): Differences and Similarities Among Germans With and Without PCE Experience

2018

Pharmacological cognitive enhancement (PCE), the use of illicit and/or prescription drugs to increase cognitive performance, has spurred controversial discussion in bioethics. In a semi-structured interview study with 60 German university students and employees, differences and similarities in moral attitudes toward PCE among 30 experienced participants (EPs) vs. 30 inexperienced participants (IPs) were investigated. Substances EPs used most often are methylphenidate, amphetamines, tetrahydrocannabinol and modafinil. Both EPs and IPs addressed topics such as autonomous decision making or issues related to fairness such as equality in test evaluation and distortion of competition. While most…

Ab initio study on the low-lying excited states of retinal

1997

Ab initio results for the electronic spectrum of all-trans-retinal and its truncated model 3-methyl-all-trans (10-s-cis)-2,4,6,8,10-undecapentaen-1-al are presented. The study includes geometry determination of the ground state. Vertical excitation energies have been computed using multiconfigurational second-order perturbation theory through the CASPT2 formalism. The lowest singlet excited state in gas phase is predicted to be of nπ∗ character. The lowest triplet state corresponds, however, to a ππ∗ state. The most intense feature of the spectrum is due to the strongly dipole-allowed ππ∗ transition, in accordance with the observed maximum in the one-photon spectra. The vertical excitation …

Charge-Separation and Charge-Recombination Rate Constants in a Donor–Acceptor Buckybowl-Based Supramolecular Complex: Multistate and Solvent Effects

2021

The kinetics of the nonradiative photoinduced processes (charge-separation and charge-recombination) experimented in solution by a supramolecular complex formed by an electron-donating bowl-shaped truxene-tetrathiafulvalene (truxTTF) derivative and an electron-accepting fullerene fragment (hemifullerene, C30H12) has been theoretically investigated. The truxTTF·C30H12 heterodimer shows a complex decay mechanism after photoexcitation with the participation of several low-lying excited states of different nature (local and charge-transfer excitations) all close in energy. In this scenario, the absolute rate constants for all of the plausible charge-separation (CS) and charge-recombination (CR)…

Consequences of the spatial localization on the exciton recombination dynamics in InGaP/GaAs heterostructures

2002

5 páginas, 4 figuras.