Johan Smith
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View article: Finding passive, reciprocal metasurfaces for arbitrary wave transformations
Finding passive, reciprocal metasurfaces for arbitrary wave transformations Open
We give a general design method for finding the passive, reciprocal surface impedance tensor required to enact any wave transformation. We do this through characterising the surface in terms of a tensorial surface impedance, showing that a…
View article: Commentary on the published position statement regarding the pathogenesis of fetal basal ganglia- thalamic hypoxic-ischaemic injury
Commentary on the published position statement regarding the pathogenesis of fetal basal ganglia- thalamic hypoxic-ischaemic injury Open
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View article: Nucleated red blood cells in neonates with hypoxic ischaemic encephalopathy treated with hypothermia: A worthwhile prognostic biomarker for clinicians in LMIC?
Nucleated red blood cells in neonates with hypoxic ischaemic encephalopathy treated with hypothermia: A worthwhile prognostic biomarker for clinicians in LMIC? Open
Background. Neonatal hypoxic ischaemic encephalopathy (HIE) is a leading cause of term neonatal death worldwide, with a higherincidence in low- to middle-income settings.Objective. To investigate whether nucleated red blood cell (nRBC) cou…
View article: Transcutaneous bilirubinometry versus total serum bilirubin measurement for newborns
Transcutaneous bilirubinometry versus total serum bilirubin measurement for newborns Open
The high sensitivity of TcB to detect hyperbilirubinaemia suggests that TcB devices are reliable screening tests for ruling out hyperbilirubinaemia in newborn infants. Positive test results would require confirmation through serum bilirubi…
View article: Neonatal hypotension survey : a South African perspective
Neonatal hypotension survey : a South African perspective Open
CITATION: Van Wyk, L., Smith, J. & Hall, M. 2019. Neonatal hypotension survey : a South African perspective. South African Journal of Child Health, 13(2):73-75, doi:10.7196/SAJCH.2019.v13i2.1568.
View article: Supplementary Material for: Bioreactance Cardiac Output Trending Ability in Preterm Infants: A Single Centre, Longitudinal Study
Supplementary Material for: Bioreactance Cardiac Output Trending Ability in Preterm Infants: A Single Centre, Longitudinal Study Open
Introduction: It is unknown whether bioreactance (BR) can accurately track cardiac output (CO) changes in preterm neonates. Methods: A prospective observational longitudinal study was performed in stable preterm infants (Results: The mean …
View article: Predischarge transcutaneous bilirubin screening reduces readmission rate for hyperbilirubinaemia in diverse South African newborns: A randomised controlled trial
Predischarge transcutaneous bilirubin screening reduces readmission rate for hyperbilirubinaemia in diverse South African newborns: A randomised controlled trial Open
Predischarge TcB screening is superior in identifying newborns at risk of severe hyperbilirubinaemia compared with visual inspection. We recommend that every newborn, regardless of skin pigmentation, should receive objective bilirubin scre…
View article: Supplementary Material for: Agreement of Cardiac Output Measurements between Bioreactance and Transthoracic Echocardiography in Preterm Infants during the Transitional Phase: A Single-Centre, Prospective Study
Supplementary Material for: Agreement of Cardiac Output Measurements between Bioreactance and Transthoracic Echocardiography in Preterm Infants during the Transitional Phase: A Single-Centre, Prospective Study Open
Introduction: Bioreactance cardiac output (CO) monitors are able to non-invasively and continuously monitor CO. However, as a novel tool to measure CO, it must be proven to be accurate and precise. Objective: To determine the agreement bet…
View article: An overview of acute lung injury in general and in particular viral infections with specific reference to nebulized surfactant and anticoagulation
An overview of acute lung injury in general and in particular viral infections with specific reference to nebulized surfactant and anticoagulation Open
The coronavirus 2 (SARS-CoV-2) has resulted in an international pandemic.The SARS-CoV-2 affects cardiovascular, digestive and urogenital systems.In an attempt to develop a multimodal and targeted approach to the pathophysiology associated …
View article: Optimal Ventilation and Surfactant Therapy in Very-Low-Birth-Weight Infants in Resource-Restricted Regions
Optimal Ventilation and Surfactant Therapy in Very-Low-Birth-Weight Infants in Resource-Restricted Regions Open
In resource-restricted regions, respiratory distress syndrome (RDS) data are often underreported, making the determination of effective interventions and their outcome difficult. The combination of oxygen, nasal continuous positive airway …
View article: Effect of exogenous surfactant on Paediatric Bronchoalveolar lavage derived macrophages’ cytokine secretion
Effect of exogenous surfactant on Paediatric Bronchoalveolar lavage derived macrophages’ cytokine secretion Open
Background Bronchoalveolar lavage is a useful bronchoscopy technique. However, studies in “normal” children populations are few. Furthermore, the anti-inflammatory effects of exogenous pulmonary surfactants on the bronchoalveolar cellular …
View article: Tracking Staphylococcus aureus in the intensive care unit using whole-genome sequencing
Tracking Staphylococcus aureus in the intensive care unit using whole-genome sequencing Open
Colonized patients are responsible for repeated introduction of new S. aureus into the ICU, whereupon a proportion spread to hand-touch sites in (or near) the patient zone. This short-term reservoir for S. aureus imposes a colonization/inf…
View article: Deposition and transport of linezolid mediated by a synthetic surfactant Synsurf<sup>&reg;</sup> within a pressurized metered dose inhaler: a Calu-3 model
Deposition and transport of linezolid mediated by a synthetic surfactant Synsurf<sup>®</sup> within a pressurized metered dose inhaler: a Calu-3 model Open
The different surfactant drug combinations allow for an evaluation of the significance of the experimental model system, as well as assessment of the formulations providing a possible noninvasive, site-specific, delivery model via pMDI.
View article: Impact of pulsed xenon ultraviolet disinfection on surface contamination in a hospital facility’s expressed human milk feed preparation area
Impact of pulsed xenon ultraviolet disinfection on surface contamination in a hospital facility’s expressed human milk feed preparation area Open
The use of a PX-UVD as adjunct to standard cleaning protocols was associated with a significant decrease in surface bioburden. The study demonstrated the inefficiency of conventional cleaning. Persistence of potentially pathological specie…
View article: Thin structured rigid body for acoustic absorption
Thin structured rigid body for acoustic absorption Open
We present a thin acoustic metamaterial absorber, comprised of only rigid metal and air, that gives rise to near unity absorption of airborne sound on resonance. This simple, easily fabricated, robust structure comprising a perforated meta…
View article: Conservation Reserve Program Grasslands and Ring-Necked Pheasant Abundance in Minnesota
Conservation Reserve Program Grasslands and Ring-Necked Pheasant Abundance in Minnesota Open
Ring-necked pheasant (Phasianus colchicus) abundance was measured on 15 study areas using roadside counts during the summers of 1990-1994 to examine possible relationships to permanent grasslands and 9 other cover types. The majority of pe…
View article: The management of persistent pulmonary hypertension of the newborn: A review
The management of persistent pulmonary hypertension of the newborn: A review Open
CITATION: Lloyd, L. G. & Smith, J. 2016. The management of persistent pulmonary hypertension of the newborn : a review. South African Journal of Child Health, 10(4):194-198, doi:10.7196/SAJCH.2016.v10i4.1145.
View article: Acoustic transmission through compound subwavelength slit arrays
Acoustic transmission through compound subwavelength slit arrays Open
This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record.
View article: Intracranial complications of Serratia marcescens infection in neonates
Intracranial complications of Serratia marcescens infection in neonates Open
Even though Serratia marcescens is not one of the most common causes of infection in neonates, it is associated with grave morbidity and mortality. We describe the evolution of brain parenchymal affectation observed in association with S. …
View article: Postnatal Foot Length to Determine Gestational Age: A Pilot Study
Postnatal Foot Length to Determine Gestational Age: A Pilot Study Open
Gestational age is a critical factor in the management, decision-making, prognostication and follow-up of newborn infants. It is also essential for research and epidemiology. In the absence of an early assessment of fetal gestation by abdo…
View article: RECRUITMENT OF WINTER TICKS (DERMACENTOR ALBIPICTUS) IN CONTRASTING FOREST HABITATS, ONTARIO, CANADA
RECRUITMENT OF WINTER TICKS (DERMACENTOR ALBIPICTUS) IN CONTRASTING FOREST HABITATS, ONTARIO, CANADA Open
Recruitment of winter tick larvae (Dermacentor albipictus) was studied in a forest opening and a closed canopy deciduous forest to evaluate their potential as sources of tick infestation to moose (Alces alces). Engorged female ticks were s…