Publications by authors named "Peter Michel"
Article Synopsis
- This study investigates how residual carbon on p-GaN photocathodes affects their quantum efficiency, emphasizing the importance of a clean surface for achieving negative electron affinity.
- The research utilizes an in-situ X-ray photoelectron spectrometer (XPS) to monitor changes on the photocathode surface during cleaning, activation, and degradation processes.
- Despite the presence of carbon and oxygen contaminants from the manufacturing process, activating p-GaN with cesium allows for the formation of negative electron affinity and reveals the role of cesium carbide in photocathode performance degradation.
Background: Volatile anesthetics are used more commonly for sedation in the intensive-care-unit (ICU). However, evidence for long-term use remains low. We therefore conducted a randomized-controlled trial comparing sevoflurane with intravenous sedation with particular focus on efficacy and safety.
View Article and Find Full Text PDFArticle Synopsis
- Accelerator scientists require photocathodes with high quantum efficiency (QE) and durability; p-GaN photocathodes, enhanced with cesium, have emerged as promising candidates due to their negative electron affinity surface.* -
- In this study, p-GaN samples were cleaned and activated in an ultra-high vacuum (UHV) chamber, with subsequent analysis of their performance and surface characteristics using various microscopic techniques.* -
- Results indicate that both wet chemical and thermal cleaning processes affect the cathodes' quality, but high QE and long storage life can be achieved at lower cleaning temperatures.*
The challenge of performing a time-resolved comprehensive analysis of molecular systems has led to the quest to optimize extraction methods. When the size of a biological sample is limited, there is demand for the simultaneous extraction of molecules representing the four areas of "omics": genomics, transcriptomics, proteomics, and metabolomics. Here we optimized a protocol for the simultaneous extraction of DNA, RNA, proteins, and metabolites and compared it with two existing protocols.
View Article and Find Full Text PDFThe establishment and succession of bacterial communities in hospitalized preterm infants has not been extensively studied. Because earlier studies depended on classical cultural techniques, their results were limited. This study monitored the establishment and succession of the neonatal microbiota in the first weeks of life by analyzing the 16S rDNA variety in fecal samples applying PCR-denaturing gradient gel electrophoresis (PCR-DGGE).
View Article and Find Full Text PDF