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dinsdag 14 november 2017

Nature Methods Application Notes e-UPDATE: 14 November 2017

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14 November 2017 
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Application of patterned illumination using a DMD for optogenetic control of signaling
www.nikoninstruments.com/Products/Photostimulation-and-TIRF/Ti-LAPP >
Digital micromirror devices (DMDs) are powerful tools for photostimulation applications, including photoconversion and optogenetic manipulation, owing to their robust ability to produce novel illumination patterns with high spatiotemporal resolution. In this Application Note we showcase recent work describing how DMD technology integrated into a Nikon system can be applied toward light-gated optogenetic control of intracellular signaling.

Impact of the Claristep® Filtration System on Recovery and Adsorption of Various Therapeutic Proteins at Low Sample Volumes
www.sartorius.com/claristep >
We tested the novel filter device Claristep® for the preparation of protein samples containing one of four different target molecules, i.e. an anti-malaria vaccine candidate, aviscuminum, interferon alfa-2B or monoclonal antibody (mAb) P2G12. In comparison to the standard protocols for sample preparation prior to analysis by either reversed-phase or SEC HPLC, the Claristep® filter did not exhibit a significant difference in protein concentration if the target molecules were present with at least 1.0 g L-1. A significantly reduced product concentration was observed in the Claristep® filtered samples compared to the standard protocol for mAb P2G12 if the concentrations were lower. The protein adsorption to the filter material was well described by a Langmuir adsorption isotherm. Besides, the Claristep® filters facilitated a rapid sample preparation with minimal volume losses.

AcousticX: Handheld LED-based multispectral photoacoustic/ultrasound imaging system
www.prexion.co.jp/en/ >
Photoacoustic imaging is one of the fastest growing biomedical imaging techniques of the decade with excellent potential in plethora of clinical/pre-clinical applications. The most important factor that is slowing down the smooth entry of photoacoustic imaging into clinics is the bulky, slow and expensive solid-state lasers used for light illumination. AcousticX from PreXion Corporation is the world's first commercially available LED-based photoacoustic/ultrasound imaging system suitable for researchers/clinicians to perform structural, functional, and molecular imaging in a clinical/preclinical setting. This application note focuses on the capabilities of AcousticX in imaging superficial vasculature anatomy and to accurately guide medical/surgical needles in minimally invasive procedures.

Monitoring neurite morphology and synapse formation in primary neurons for neurotoxicity assessments and drug screening
www.thermofisher.com/hcs >
Synapse formation during nervous system development and degeneration in the pathogenesis of human neurological diseases are highly regulated processes. Subtle changes in the environment of the complex neuronal network may cause either breakdown or creation of synaptic connections. Drug discovery screening for neurological diseases and compound neurotoxicity evaluation would benefit from robust, automated, quantitative in vitro assays that monitor neuronal function.

A study on the efficacy of Prime&Bond active, the new active universal adhesive from Dentsply Sirona
www.dentsplysirona.com/en-gb/products/restorative/prime-&-bond-active.html >
Prime&Bond active™ is a one-component universal dental adhesive which brings new advantages to the universal adhesive arena. For effective bonding, conventional Universal Dental adhesives require ideal moisture conditions to form a homogeneous adhesive layer, and in turn a strong bond between tooth and restoration. However, when too much or too little moisture is present this may not happen and bonding can fail. Prime&Bond active contains "Active-Guard" technology, which gives this adhesive smart properties that compensate for variations in moisture levels and ensure complete adhesive coverage of the tooth.

Quantitative live-cell analysis for optimization of culture conditions and evaluation of cell health in human induced pluripotent stem cell-derived neurons
www.essenbioscience.com/en/ >
In this application note, we describe methods and present validation data highlighting optimal culture conditions for evaluation of cell viability and neurite outgrowth in hiPSCderived neurons from Cellular Dynamic International (CDI, iCell Neurons). We also monitor neurite outgrowth and cellular viability in iCell Gluta Neurons from CDI using a quantitative, live-cell imaging and analysis approach with the IncuCyte® S3 over days/weeks in 96-well microplate culture. To exemplify a real-time imaging and analysis approach using hiPSCderived neurons, we assess neuronal excitotoxicity using the IncuCyte® S3 Phase/Fluorescent NeuroTrack applications multiplexed with Annexin V reagents. These assays outline optimal culture conditions for an example iPSC-derived neuronal system and demonstrate the ability of the IncuCyte approach for real-time, long-term quantitative analysis ofiPSC-derived neuronal cell health.

Gibson Assembly® Primer-Bridge End Joining (PBnJ™) Cloning
www.syntheticgenomics.com >
Gibson Assembly® cloning has proven to be useful as a molecular biology technique for the seamless assembly of synthetic and natural genes and large-scale genetic pathways. Notably, Gibson Assembly cloning has enabled the synthesis of the first bacterial genome1, the first synthetic cell2, and the first minimal cell3. Additionally, the Gibson Assembly method has been utilized for genetic recoding (genome-wide codon removal)4, the engineering of Cre recombinase for improved site-specificity5, and has been incorporated into a one-step method for cloning gRNA for the CRISPR-Cas9 system6.


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