Unravelling HetC as a peptidase-based ABC exporter driving functional cell differentiation in the cyanobacterium PCC 7120.

The export of peptides or proteins is essential for a variety of important functions in bacteria. Among the diverse protein-translocation systems, peptidase-containing ABC transporters (PCAT) are involved in the maturation and export of quorum-sensing or antimicrobial peptides in Gram-positive bacteria and of toxins in Gram-negative organisms. In the multicellular and diazotrophic cyanobacterium PCC 7120, the protein HetC is essential for the differentiation of functional heterocysts, which are micro-oxic and non-dividing cells specialized in atmospheric nitrogen fixation.

Cancer Patient Navigation in Canada: Directions From the North.

Objectives: Cancer is a complex disease that is experienced by those affected by cancer and their loved ones differently. The importance of cancer patient navigation is quintessential to support those affected through the healthcare system and to supportive resources. Canadian cancer statistics advise of the continued increase of cancer and impacts on health care.

Empowering Oncology Nurses through Knowledge and Practice to Improve Transitions Following Treatment and Survivorship Care.

Following cancer treatment, individuals can be left with physical, emotional, and practical consequences which influence their quality of life. Cancer survivors frequently require added knowledge and skills to handle the demands of everyday living after treatment. Oncology nurses are in an ideal position to address the needs of cancer survivors.

HetL, HetR and PatS form a reaction-diffusion system to control pattern formation in the cyanobacterium PCC 7120.

Local activation and long-range inhibition are mechanisms conserved in self-organizing systems leading to biological patterns. A number of them involve the production by the developing cell of an inhibitory morphogen, but how this cell becomes immune to self-inhibition is rather unknown. Under combined nitrogen starvation, the multicellular cyanobacterium PCC 7120 develops nitrogen-fixing heterocysts with a pattern of one heterocyst every 10-12 vegetative cells.

Is normalized hindlimb length measurement in assessment of thyroid disruption in the amphibian metamorphosis assay relevant?

The amphibian metamorphosis assay represents an OECD Level 3 and EDSP Tier 1 ecotoxicity test assessing thyroid activity of chemicals in African clawed frog (Xenopus laevis). To evaluate the effectiveness of snout-vent length (SVL) normalization of hindlimb length (HLL), correlation between the HLL and SVL or body weight was evaluated in the control groups of 10 individual studies from three laboratories. Two studies required separate analysis of the Nieuwkoop-Faber (NF) stage ≤60 and >60 animals creating a total of 12 data sets.