Abstract Because primordial black holes (PBHs) evaporate into all particle species in nature, PBHs may emit several dark matter (DM) with specific mass spectra. We assume that are the only source of DMs, and DMs interact standard model particles gravitationally. show a relation between number DM NDM initial PBH density β $M_{\rm BH}^{\rm in}$. β–$M_{\rm in}$ curves for different tend to overlap...

Addition of dimethylsulfide (DMS), dimethyldisulfide (DMDS), or methane thiol (MSH) to a diversity of anoxic aquatic sediments (e.g., fresh water, estuarine, alkaline/hypersaline) stimulated methane production. The yield of methane recovered from DMS was often 52 to 63%, although high concentrations of DMS (as well as MSH and DMDS) inhibited methanogenesis in some types of sediments. Production...

Oceans dominate emissions of dimethyl sulfide (DMS), the major natural sulfur source. DMS is important for the formation of non-sea salt sulfate (nss-SO42-) aerosols and secondary particulate matter over oceans and thus, significantly influence global climate. The mechanism of DMS oxidation has accordingly been investigated in several different model studies in the past. However, these studies ...

Phytoplankton bloom cycles were followed for 9 d in two 20 l carboy mesocosms filled with water from the offshore plume of Mobile Bay Alabama, USA, and incubated under fluorescent light. One of the blooms was enriched by addition of nitrate+phosphate (+nutrients), and both blooms were used to study how dimethylsulfide (DMS) concentrations and biological consumption varied over the bloom cycles....

While it seems intuitively obvious tha t many discourse markers (DMs) are able to express discourse relat ions (DRs) which ex i s t independently, the specific contr ibut ion of DMs if any is not clear. In this paper , we investigate the s tatus of some consequence DMs in French. We observe tha t it is difficult to cons t ruc t a clear and simple definition based on DRs for these DMs. Next , we...

This study reports a quantitative and qualitative analysis of the use of discourse markers (DMs) in personal narrative and argumentative papers written by 30 undergraduate students: 15 native speakers (NS) and 15 nonnative speakers (NNS). The study also ascertains whether the frequency and the incorrect use of DMs plays a role in determining the quality of ESL writings. Findings showed that the...

This work presents the heterogeneous kinetics of the reaction of CH 3 SCH 3 (dimethyl sulphide, DMS) with O 3 (ozone) in aqueous solution at different ionic strengths (0, 0.1 and 1.0 M NaCl) using the wetted-wall flowtube (WWFT) technique. Henry's law coefficients of DMS were determined on pure water and on different concentrations of NaCl 5 (0.1 M–4.0 M) in the WWFT from UV spectrophotometric ...

Double minutes (DMs) seen in a substantial fraction of human tumors are the cytogenetic manifestation of gene amplification which renders the tumor cells advantageous for growth and survival. DMs are acentric and atelomeric chromatin composed of circular DNA. In this study, we found they showed a remarkable relocation inside the nucleus which was spatially and temporally coupled to DNA replicat...

trans-2,3-Dimethoxystilbene (2,3-DMS) and trans-3,4-dimethoxystilbene (3,4-DMS) are two synthetic resveratrol (trans-3,5,4'-trihydroxystilbene) analogs. In this study, a simple HPLC method was developed and validated to determine 2,3-DMS and 3,4-DMS in rat plasma. Chromatographic separation was obtained with a reversed-phase HPLC column through a 12.5-min gradient delivery of a mixture of aceto...