Lineage tracing studies suggest that the placenta is not a de novo source of hematopoietic stem cells.

Definitive hematopoietic stem and progenitor cells (HSPCs) arise from a small number of hemogenic endothelial cells (HECs) within the developing embryo. Understanding the origin and ontogeny of HSPCs is of considerable interest and potential therapeutic value. It has been proposed that the murine placenta contains HECs that differentiate into HSPCs.

Reconciling and validating the Ashworth-Davies Doppler shifts of an arbitrarily translating mirror.

We simplify, to first order in , the generalized, special relativistic treatment of a Doppler shift from an arbitrarily translating mirror originally derived by Ashworth and Davies [Proc. IEEE64, 280 (1976)IEEPAD0018-921910.1109/PROC.

Does Teething Disrupt Infant Sleep? A Longitudinal Auto-Videosomnography Study.

Objective: To examine prospectively the relationship between teething and infant sleep using objective sleep measurements.

Study Design: Over a 4-week period, 849 infants aged 3-18 months (mean = 8.4 ± 1.

The distribution and severity of lower-limb hypertonicity and spasticity differentially impacts walking speed in people with neurological injuries.

Purpose: To investigate the relationship between the distribution and severity of hypertonicity and spasticity on walking speed in people with neurological injuries.

Material/methods: This cross-sectional observation cohort study used the Modified Ashworth Scale (MAS) and Modified Tardieu Scale (MTS) to assess hypertonicity and spasticity of the gastrocnemius, soleus, hamstrings and quadriceps. Participants were classified as having a distal (gastrocnemius and/or soleus), proximal (hamstrings and/or quadriceps) or mixed distribution of hypertonicity or spasticity.