Fabrication of Stabilized Gold Nanoparticle Oligomers for Surface-Enhanced Spectroscopies.

Various time-resolved spectroscopies that take advantage of surface-enhancement have been developed. Only the most robust substrates can withstand the high-intensity laser pulses used by time-resolved methods. We present a simple and reliable stabilization procedure that uses polyvinyl alcohol for the formation of robust gold nanoparticle oligomers that can withstand different hydration and temperature levels. This procedure can be used to produce oligomers with varying and reproducible plasmon resonance conditions. Results show that gold nanoparticle oligomers stabilized in this way are sufficiently sturdy to be used in 3D printing, opening the door for easy production and integration of plasmonic substrates.

Do Single-Family Rooms Increase Parental Presence, Involvement, and Maternal Well-Being in Neonatal Intensive Care?

Objectives of this study were to determine whether single-family room (SFR) design enhances parental presence, involvement, and maternal well-being during neonatal intensive care hospitalization. An observational cohort including mothers of infants was randomly assigned to receive care in a tertiary-level open-bay (OB) (n = 35) or SFR (n = 36). Mothers were asked to complete daily diaries documenting parental presence, involvement in care, and questionnaires examining maternal well-being. Mother and father mean presence (standard deviation) was significantly higher in the SFR-17.4 (5.2) and 13.6 (6.8)-compared to OB-11.9 (6.3) and 4.6 (3.7) hours/day. Total time spent in care activities did not differ for mothers, except SFR mothers spent more time expressing breast milk (EBM). SFR fathers had greater involvement with care activities. There were no other significant differences. The SFR was associated with greater maternal presence, but not greater involvement in care activities except for EBM, nor improved maternal well-being. The SFR appears to have greater impact on fathers' involvement in care and comforting activities, although the amount of time involved remained quite low compared with mothers. Further studies examining ways to enhance parental involvement in the neonatal intensive care unit are warranted.

Caregiver Presence and Involvement in a Canadian Neonatal Intensive Care Unit: An Observational Cohort Study.

BACKGROUND: Presence in the neonatal intensive care unit (NICU) is a vital step for caregivers initiating involvement, such as skin-to-skin contact, holding or singing/reading to their newborn. Little is known about caregiver presence and involvement in Canadian NICU's context by caregiver type (mother, father, other), and the association between maternal presence and key maternal and newborn characteristics. PURPOSE: The primary objective was to examine the presence and involvement of family caregivers in the NICU. The secondary objective was to examine the relationship between maternal presence and maternal and newborn characteristics. DESIGN AND METHODS: A prospective observational cohort study in an open bay setting of an Eastern Canadian NICU. Presence (physically present at the newborn's bedside) and involvement (e.g., skin-to-skin, singing/reading) were tracked daily by families in the NICU until discharge. Demographic information was also collected. RESULTS: Participants included 142 mothers and their newborns. Mothers were present 8.7 h/day, fathers were present 4.1 h/day, and other caregivers were present 1.8 h/day in the NICU in the first 34 days. Mothers were involved in care activities 50% of the time they were present in the NICU, whereas fathers and other caregivers were spending 20% and 6% of their time respectively. Regression identified maternal age, distance to home, parity, birthweight, and length of stay to be statistically significant variables related to maternal presence. CONCLUSIONS: There is variation in presence and involvement by caregiver type. Targeted interventions to maintain and increase mothers, fathers and other caregivers' presence and involvement in care throughout their stay in the NICU are recommended.

Validity and reliability of GPS for measuring distance travelled in field-based team sports.

The aim of the present study was to examine the effects of movement intensity and path linearity on global positioning system (GPS) distance validity and reliability. One participant wore eight 1-Hz GPS receivers while walking, jogging, running, and sprinting over linear and non-linear 200-m courses. Five trials were performed at each intensity of movement on each 200-m course. One receiver was excluded from analysis due to errors during data collection. The results from seven GPS receivers showed the mean (± s) and percent bias of the GPS distance values on the 200-m linear course were 205.8 ± 2.4 m (2.8%), 201.8 ± 2.8 m (0.8%), 203.1 ± 2.2 m (1.5%), and 205.2 ± 4 m (2.5%) for the walk, jog, run, and sprint trial respectively. Walk and sprint distances were significantly different from jogging and running distances (P < 0.05). The GPS distance values on the 200-m non-linear course were 198.9 ± 3.5 m (-0.5%), 188.3 ± 2 m (-5.8%), 184.6 ± 2.9 m (-7.7%), and 180.4 ± 5.7 m (-9.8%) for the walk, jog, run, and sprint trial respectively; these were significantly lower than those for the corresponding values on the linear course (P < 0.05). Differences between all non-linear movement intensities were significant (P < 0.05). The overall coefficient of variation within and between receivers was 2.6% and 2.8% respectively. Path linearity and movement intensity appear to affect GPS distance accuracy via inherent positioning errors, update rate, and conditions of use; reliability decreases with movement intensity.