Publications by authors named "A Walser"
Background And Purpose: Identifying and assessing hemodynamic and flow status in patients with symptomatic internal carotid artery (ICA) occlusion is crucial for evaluating recurrent stroke risk. The aim of this study was to analyze the correlation between two quantitative imaging modalities: (1) blood oxygenation level-dependent (BOLD) cerebrovascular reactivity (CVR) and (2) quantitative magnetic resonance angiography (qMRA) with non-invasive optimal vessel analysis (NOVA), measuring volume flow rate (VFR). Comparing these modalities is relevant for assessing collateral circulation and hemodynamic impairment.
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- The Saharan Aerosol Longrange TRansport and Aerosol Cloud interaction Experiment (SALTRACE) conducted flight measurements to evaluate the structural properties of the Saharan air layer (SAL), focusing on its chemical, morphological, and optical characteristics during transport from Cape Verde and the Caribbean.* -
- The study found that SAL was predominantly dust (>90%) with minimal mixing (less than 1%) with other particles, and changes in the shape of the dust particles during transport were not statistically significant.* -
- A notable finding was a reduction in iron oxide content in transported SAL, which led to a decrease in dust light absorption, indicating the importance of including iron oxide size distribution in future aerosol research.*
Inflammatory chemokines are often elevated in disease settings, where the largest group of CC-chemokines are the macrophage inflammatory proteins (MIP), which are promiscuous for the receptors CCR1 and CCR5. MIP chemokines, such as CCL3 and CCL5 are processed at the N terminus, which influences signaling in a highly diverse manner. Here, we investigate the signaling capacity of peptides corresponding to truncated N termini.
View Article and Find Full Text PDFThe adhesion receptor ADGRA3 (GPR125) is a known spermatogonial stem cell marker, but its impact on male reproduction and fertility has not been examined. Using a mouse model lacking Adgra3 (Adgra3 ), we show that 55% of the male mice are infertile from puberty despite having normal spermatogenesis and epididymal sperm count. Instead, male mice lacking Adgra3 exhibited decreased estrogen receptor alpha expression and transient dilation of the epididymis.
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- In March 2020, Ischgl, Austria experienced a significant SARS-CoV-2 outbreak that contributed to the virus spreading across Austria and Northern Europe.
- A study conducted in April 2020 included 1473 residents with testing for SARS-CoV-2 and found a seroprevalence of 42.4%, indicating a high level of past infections, particularly lower in individuals under 18.
- The majority of seropositive individuals had not been previously diagnosed, and the results suggested that public health measures and the population's immunity led to a decrease in new infections by late April.