The extent to which weed species vary in their ability to acquire and use different forms of nitrogen (N) (inorganic and organic) has not been investigated but could have important implications for weed survival and weed–crop competition in agroecosystems. We conducted a controlled environment experiment using stable isotopes to determine the uptake and partitioning of organic and inorganic N (amino acids, ammonium, and nitrate) by seven common weed and non-weed species. All species took up inorganic and organic N, including as intact amino acids. Concentrations of 15N derived from both ammonium and amino acids in shoot tissues were higher in large crabgrass [Digitaria sanguinalis (L.) Scop.] and barnyardgrass [Echinochloa crus-galli (L.) P. Beauv] than in common lambsquarters (Chenopodium album L.), redroot pigweed (Amaranthus retroflexus L.), and sorghum-sudangrass [Sorghum bicolor (L.) Moench × Sorghum bicolor (L.) ssp. drummondii (Nees ex Steud.) de Wet & Harlan]. In contrast, the concentration of 15N derived from nitrate was higher in wild mustard (Sinapis arvensis L.) shoots than in wild oat (Avena fatua L.) shoots. Root concentration of 15N derived from ammonium was lower in sorghum-sudangrass compared with other species, except for A. retroflexus and A. fatua, while root concentration of 15N derived from nitrate was lower in A. retroflexus compared with other species, except for C. album and S. arvensis. Discriminant analysis classified species based on their uptake and partitioning of all three labeled N forms. These results suggest that common agricultural weeds can access and use organic N and differentially take up inorganic N forms. Additional research is needed to determine whether species-specific differences in organic and inorganic N uptake influence the intensity of competition for soil N.

Carbapenem-resistant Acinetobacter baumannii (CRAB) with diverse multilocus sequence typing emerged among our nursing home residents (6.5%) with a high background rate of MRSA (32.2%). Rectal swabs yielded a higher rate of CRAB detection than axillary or nasal swabs. Bed-bound status, use of adult diapers, and nasogastric tube were risk factors for CRAB colonization.

Infect Control Hosp Epidemiol 2016;37:983–986

Language, culture and not knowing how to access services are barriers to the use of health services for Asian migrants. Asian Smokefree Communities (ASC) pilot-tested a novel Asian-specific service model to address these issues for Asian smokers. Korean- and Chinese-speaking coordinators delivered home-, workplace- or clinic-based interventions to support smokers with cessation and create smoke-free environments with families. A prior planned evaluation investigated the acceptability of the service, quit rates and exposure to second-hand smoke. The methods included analysis of ASC service records, a client satisfaction survey and key informant interviews. Clients were satisfied with factors associated with culture, such as being comfortable when talking to coordinators (88.9%) and family involvement in treatment (79.4%). Appointment attendance was high (97%). The self-reported quit rate for the 93 cessation clients was 72% at 1 month, 53.8 % at 3 months and 40.9 % at 6 months. All homes (100%) were smoke-free after the intervention, an increase of 18% from preintervention levels. The ASC model was acceptable to Asian clients. It helped them stop smoking and increased household protection from second-hand smoke. The model could make an effective contribution to smoke-free services for Asian populations in western countries.