Natural Abiotic Iron-Oxido-Mediated Formation of C and C Compounds from Environmentally Important Methyl-Substituted Substrates.

Organic and inorganic volatile compounds containing one carbon atom (C), such as carbon dioxide, methane, methanol, formaldehyde, carbon monoxide, and chloromethane, are ubiquitous in the environment, are key components in global carbon cycling, play an important role in atmospheric physics and chemistry, e.g., as greenhouse gases, destroy stratospheric and tropospheric ozone, and control the atmospheric oxidation capacity.

Methane formation driven by light and heat prior to the origin of life and beyond.

Methane is a potent greenhouse gas, which likely enabled the evolution of life by keeping the early Earth warm. Here, we demonstrate routes towards abiotic methane and ethane formation under early-earth conditions from methylated sulfur and nitrogen compounds with prebiotic origin. These compounds are demethylated in Fenton reactions governed by ferrous iron and reactive oxygen species (ROS) produced by light and heat in aqueous environments.

[Ophthalmological alterations at the initial diagnosis of HIV infection].

Acquired immunodeficiency syndrome (AIDS) caused by the human immunodeficiency virus (HIV), is one of the most important infectious causes of death in the twentieth and twenty-first centuries. Ocular manifestations can appear in particular when the CD4 cell count is low. This article presents a case report of a 38-year-old homosexual man in whom HIV microangiopathy retinopathy syndrome (MAPS) was found during the assessment of the initial HIV diagnosis.

[The IOL-Vip system : Principles and clinical application].

There are various retinal disorders that cause macular degeneration. However, age-related macular degeneration (ARMD) is the main cause of legal blindness in developed countries. Even today the end stage of this disease can often not be avoided.