15 research outputs found
Comparison of techniques used to count single-celled viable phytoplankton
Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Journal of Applied Phycology 24 (2012): 751-758, doi:10.1007/s10811-011-9694-z.Four methods commonly used to count phytoplankton were evaluated based upon the precision of concentration
estimates: Sedgewick Rafter and membrane filter direct counts, flow cytometry, and flow-based imaging cytometry
(FlowCAM). Counting methods were all able to estimate the cell concentrations, categorize cells into size classes,
and determine cell viability using fluorescent probes. These criteria are essential to determine whether discharged
ballast water complies with international standards that limit the concentration of viable planktonic organisms based
on size class. Samples containing unknown concentrations of live and UV-inactivated phytoflagellates (Tetraselmis
impellucida) were formulated to have low concentrations (<100 ml-1) of viable phytoplankton. All count methods
used chlorophyll a fluorescence to detect cells and SYTOX fluorescence to detect non-viable cells. With the
exception of one sample, the methods generated live and non-viable cell counts that were significantly different
from each other, although estimates were generally within 100% of the ensemble mean of all subsamples from all
methods. Overall, percent coefficient of variation (CV) among sample replicates was lowest in membrane filtration
sample replicates, and CVs for all four counting methods were usually lower than 30% (although instances of ~60%
were observed). Since all four methods were generally appropriate for monitoring discharged ballast water,
ancillary considerations (e.g., ease of analysis, sample processing rate, sample size, etc.) become critical factors for
choosing the optimal phytoplankton counting method.This study was supported by the U.S. Coast Guard Research and Development Center under contract HSCG32-07-
X-R00018. Partial research support to DMA and DMK was provided
through NSF International Contract 03/06/394, and Environmental Protection Agency Grant RD-83382801-0
The genetic architecture of the human cerebral cortex
The cerebral cortex underlies our complex cognitive capabilities, yet little is known about the specific genetic loci that influence human cortical structure. To identify genetic variants that affect cortical structure, we conducted a genome-wide association meta-analysis of brain magnetic resonance imaging data from 51,665 individuals. We analyzed the surface area and average thickness of the whole cortex and 34 regions with known functional specializations. We identified 199 significant loci and found significant enrichment for loci influencing total surface area within regulatory elements that are active during prenatal cortical development, supporting the radial unit hypothesis. Loci that affect regional surface area cluster near genes in Wnt signaling pathways, which influence progenitor expansion and areal identity. Variation in cortical structure is genetically correlated with cognitive function, Parkinson's disease, insomnia, depression, neuroticism, and attention deficit hyperactivity disorder
Punishment and welfare: defending offender’s inclusion as subjects of state care
Many criminal offenders come from disadvantaged backgrounds, which punishment entrenches. Criminal culpability explains some disadvantageous treatment in state-offender interactions; yet offenders remain people, and ‘some mother’s child’, in Eva Kittay’s terms. Offending behaviour neither erases needs, nor fully excuses our responsibility for offenders’ needs. Caring is demanded in principle, recognising the offender’s personhood. Supporting offenders may amplify welfare resources: equipping offenders to provide self-care; to meet caring responsibilities; and enabling offenders’ contribution to shared social life, by providing support and furthering the choices of others seeking to engage with them. The desistance paradigm (viewing desistance from offending as a process, following from an offender’s active choice in the context of stabilising social structures and personal circumstances), implies that a supportive environment may facilitate reduced recidivism. While decisions about criminal culpability need justice, we may use state resources most effectively by also including care ethics in our thinking about punishment