contrast

Brilliant Core Reagent Kits for QPCR and QRT-PCR

...ct amplified to thatpoint in the reaction. 1,2 In contrast to endpoint analysis, real-timequantitation is based on measurements taken during the exponential phase ofamplification, a time when PCR efficiency is least influenced by reactionvariables. Multiplex QPCR is the ultimate answer to precise quantitatio...

Counting Colonies or Plaques Directly from Images of Agar Plates

...uld be acquired in a manner that provides the best contrast between coloniesor plaques and background. The ima...d betaken during image acquisition to maximize the contrast between colonies orplaques and their respective backgrounds. For white or blue bacterial colonieson ...

New Mammalian Expression Vectors Employ Stable, High-Level Fluorescence Humanized Renilla GFP Reporter

...n expression vectors by Stratragene. 1 In contrast to the jellyfish Aequoria victoria enhanced GFP (EGFP), humanized Renilla GFP (hrGFP) has low cellular toxicity. This important attribute resolves problems that arise from the high cytotoxicity of EGFP, which triggers events t...

Optimized Imaging of Protein Gels Stained with Coomassie Brilliant Blue Dye

...ue dye. TheCoomassie blue bandpass filter enhances contrast and sensitivity for stainedprotein gels when compa...in front of a camera lens to isolate or enhancethe contrast between specific wavelengths of light. Stratagenes line ofoptical filters for the Eagle Eye II still...

Performance Comparisons of Commercial RT-PCR Systems

... RT-PCRsystem is more convenient and versatile, in contrast to other suppliers kits.For example, the performance of the Titan One-Tube RT-PCR system was dependentupon the use of a specific cycling regimen (data not shown), which requiresprogressive increases in extension time per cycle (Methods). Therefore,re...

Detect Released Oligosaccharides Using the Eagle Eye II Still Video Imaging System

...rature, the bands spread significantly. While the contrast in banding patterns appears higher in the gel image takenusing Glykos gel imager, this is probably due to the Glyko cameras shorterfocal distance. However, the same banding numbers and definitions are seen inboth gels. Additionally, Stratagenes gel a...

Eagle Eye Optical Filter Optimized for Imaging Silver-Stained Gels

...Eagle Eye II Still Video System that increases contrast and sensitivity when imagingsilver-stained protein...E gels, 1 we designed an optical filter toimprove contrast and sensitivity when imaging these gels. Thus, Stratagenesoptical filter line now comprises ethidium...

Intracytoplasmic Spermatocyte Injection (ICSI)

...ith an inverted microscope, combined with Hoffmann contrast optics or differential interference contrast optics, microinjection can be effected quickly and simply. Operating Transfer...

Transgenic Animals

...e, combined with Hoffmann modulation contrast optics or differential interference contrast optics, microinjection can be effected quickly and simply. ...

Genetic Reporter Systems

...the human Growth Hormone (hGH) reporter system in contrast to most other systems the reporter protein is secreted into the culture medium by the transfected cells. This means that cell lysis is not necessary for quantifying the reporter protein. Detection of the secreted hGH ...

Genetic Reporter Systems

...the human Growth Hormone (hGH) reporter system in contrast to most other systems the reporter protein is secreted into the culture medium by the transfected cells. This means that cell lysis is not necessary for quantifying the reporter protein. Detection of the secreted hGH ...

cMaster RTplusPCR System for increased sensitivity and product length in RT-PCR

... of one-step protocols on templates this long. In contrast the Eppendorf kit can consistently and reliably amplify this product from 10 ng of RNA from HELA cells. Experiment 3: Two Step RT-PCR of short, long, rare and abundant transcripts from various sources of total RNA. ...

QIAGEN Multiplex PCR Handbook

...ification of multiple PCR products. In contrast to conventional PCR reagents, the QIAGEN Multiplex PCR Buffer contains a specially developed balanced combination of salts and additives to ensure comparable efficiencies for annealing and extension of all primers ...

PolyFect Transfection Reagent

... " PolyFect Reagent with HeLa Cells "). In contrast to many liposomal reagents, PolyFect Reagent enables transfection in the presence of serum without lowering of transfection efficiency. High Transfection Efficiencies Comparison...

Custom and library siRNA for efficient gene silencing

...eveloped and optimized for multiplex PCR. In contrast to conventional PCR reagents, the new buffer contains a balanced combination of salts and additives to ensure comparable efficiencies for annealing and extension of all primers in the reaction (Figure 1). Successful 16plex P...

TransMessenger Transfection Reagent Handbook

...al. The solutions are stable for 1 year at 28C. In contrast to many liposome-based reagents, TransMessenger Transfection Reagent is not sensitive to oxygen, and so does not require storage under an inert gas. Additionally, TransMessenger Transfection Reagent does not need to be...

Transfection Reagent Selector Kit Handbook

... components are stable for 1 year at 28C. In contrast to many liposome-based reagents, SuperFect Reagent.... Effect of serum In contrast to many liposome transfection reagents, SuperFect Reagent and Effectene Reagent enable transfe...

Quantitation of Cabergoline at Extremely Low Plasma Concentrations with a Triple Quadrupole Mass Spectrometer

...umn. [67] The method used here is in marked contrast to a previous method for cabergoline developed on the older generation TSQ 7000 triple quadrupole mass spectrometer, which reported an LLOQ value of 1.86 pg/mL (S/N ratio of 1813.1). However, this LLOQ actually represents ~900 fg of...

Choice of RT-PCR Enzymes

... RNase H activity In contrast to Tth DNA Polymerase, AMV and M-MuLV Reverse Transcriptases have RNase H activity. This activity will specifically degrade RNA in an RNA:cDNA hybrid. This can be detrimental if degradation of template RNA competes with DNA sy...

PCR Core KitPLUS

... uracil-containing DNA molecules in 10 min. In contrast to the enzyme from E. coli, heat-labile UNG will not modify dU-containing PCR products for at least several hours at 4C. Therefore, it is not necessary to freeze dU-containing PCR products immediately after amplification...

Uracil-DNA Glycosylase

...ng DNA molecules in 10 min. In contrast to the enzyme from E. coli, heat-labile UNG will not modify dU-containing PCR products for at least several hours at 4C. Therefore, it is not necessary to freeze dU-containing PCR products immediately after amplification...

Quantitative Measurement of Cell Proliferation Using the BrdU ELISA: A Comparison Between Colorimetric and Chemiluminescent Detection

... that this testhas only a limited linear range. In contrast to numerousother ELISA kits, however, when the linear range of theBrdU ELISA is exceeded, it is not possible to just dilute the sample because the latter is a cellular ELISA in whichthe labeled, cultivated cells produce the signals. In suchcases, the...

A Further Step in Understanding Apoptosis Direct Detection of PARP Cleavage

...P-1 was shown to bea hallmark of apoptosis [2]. In contrast to measuringactive caspase 3, which is degraded during apoptosis viathe ubiquitin/proteosome pathway, measuring PARP-1cleavage might allow sustained signal detection even inlate stages of apoptosis. Product D...

Cell Proliferation and Viability Measurement

...s or suboptimal cultureconditions. In contrast to cell viability analysis, cell proliferationassessment is defined as the measurement of activelydividing cells in a sample. It can be expressed either asthe actual number or proportion of proliferating cells incell culture, tissues, or as relative ...

Monitoring transfection efficiency by green fluorescent protein (GFP) detection with the Agilent 2100 bioanalyzer

...differenttransfection methods or newcell lines. In contrast to fluorescencemicroscope techniques, the2100 bioanalyzer system providesaccurate, quantitative data foroptimization experiments, withouttedious manual cell counting. TheAgilent 2100 bioanalyzer is easy touse and requires a short setuptime, while res...

Comparison of different protein quantitation methods

...nreproducibility and an errorof 10 % or better. In contrast the 2100 bioanalyzer results are muchmore consistent for all of the analyzedtarget concentrations, providinggood and comparable quantitationaccuracy and reproducibilityacross the tested concentrationrange. Lowry Analysis w...

Quality control of antibodies using the 2100 bioanalyzer and the Protein 200 Plus assay

...imeconsumingand difficult to standardize (1-3). In contrast the Agilent2100 bioanalyzer provides afast, standardized method withautomated and detailed data analysis....

Quality assurance of RNA derived from laser microdissected tissue samples obtained by the PALM MicroBeam System using the RNA 6000 Pico LabChip kit.

... reflectsthe starting amount of RNA(figure 5C). In contrast to thetest with Manufacturer C (seeabove) NFR was the optimalstain, though the Cp-values layvery close together (only halfa cycle difference) exceptfor MB which showed worseresults. (CpNFR: 34,7; CpHE:35,2; CpMG: 35,8; CpMB: 37,6).This real-time RT-P...

High resolution DNA analysis with the DNA 500 and DNA 1000 LabChip kits

...improved data precision, and easeof use. In contrast to slab gel electrophoresis,the Agilent 2100 bioanalyzerin conjunction withLabChip kits performs chipbasedseparations under standardizedconditions, resulting in more reproducible results. Using prepackagedreagents and an assayspecific software script...

Choose the Right Transfection Agent for Your RNAi Experiment

... -- siPORT Amine and siPORT Lipid In contrast to the DNA based expression systems for siRNA described above, many researchers perform transient RNAi experiments by direct transfection of siRNAs into cells. siPORT Amine (a polyamine mixture) and siPORT Lipid (a mixture...

HIGH SENSITIVITY qRT-PCR

...ion with SYBR Green dye (not included). In contrast to other kits that require different enzymes for low and high amounts of input RNA, MessageSensor provides a one-size-fits-all solution for your most demanding qRT-PCR applications. Real-time or end point detection and quantit...

GENE SILENCING WITH PCR PRODUCTS

... Expression Cassettes In contrast to siRNA expression vectors, which require cloning and sequencing prior to use and can take 1-2 weeks to prepare, SECs can be prepared in less than a day. SECs thus provide an excellent screening ...

Five Ways to Produce siRNAs

...A hairpin, and an RNA pol III termination site. In contrast to siRNA expression vectors, which require cloning and sequencing prior to use and thus take 12 weeks to prepare, SECs can be generated by PCR in less than a day. SECs thus provide an excellent screening tool to find t...

Efficient Delivery of siRNAs to Human Primary Cells: Electroporation vs. Chemical Transfection

...in at least these three types of primary cells. In contrast to chemical transfection reagents, electroporation of a GAPDH siRNA reduced GAPDH expression by greater than 90% across several primary cell types, including NHEK cells, which are ...

Protect RNA and Improve Target Cell Identification

...y damaged, Acridine Orange may also provide better contrast than Cresyl Violet. Figure 3. LCM Sample Stained with Acridine Orange in Ambion's LCM Staining Kit. These representative photographs show a 10 m section from mouse hippocampus (4X magnification) that wa...

Northern Analysis: The Basics

... to be easily removed or "stripped" off blots, in contrast to standard RNA probes. Isotopic or nonisotopic labeled nucleotides can be incorporated directly during synthesis with either kit, or the RNA can be synthesized unlabeled and subsequently treated with <A ...

A Multiple Mutation Model System as a Test Development and Training Tool for Denaturing Gradient Gel Electrophoresis

...he detection of alterations in advance. This is in contrast to other methods of detection that rely on empirical evidence of the discovery of mutations in a fragment. The disadvantages of DGGE include the specialized equipment necessary to run the gels, the consistency of pouring gradi...

Detection of K-ras Point Mutations in the Pancreas by Constant Denaturing Gel Electrophoresis Using the DCode System

...result with one of the positive samples. In contrast to this low frequency, we could detect K-ras point mutations in more than 95% of ductal adenocarcinoma of the pancreas (data not shown). Discussion Mutations of K-ras were thought to be quite rare in pan...

Detection of Mutations in the Fas Antigen of Lymphoma Tumors by RT-PCR and Denaturing Gradient Gel Electrophoresis

... Fas antigen in hematological tumors. In contrast to many other rapid screening techniques, DGGE is based on known physical parameters of a particular gene. By calculating the predicted melting temperature of a segment of DNA, analytical conditions can be optimized for maximum ...

Preparative SDS-PAGE Electrophoresis of a Recombinant Epstein-Barr Virus Encoded Protein and Its Application in Serodiagnostic Test Systems, Rev C

...is procedure, the recovered protein is, in contrast to the applied protein, renatured and completely soluble in standard electrophoresis buffer. Due to incorrect refolding and precipitation within the electrophoresis column, however, a reduction in the overall yield may be obse...

Rapid, Reproducible Real-Time Quantitative RT-PCR Using the iCycler iQ Real-Time PCR Detection System and iQ Supermix, Rev A

... reactions varied with each GSP (Figure 4B), in contrast to the traces for the iQ supermix reactions (Figure 4A). In the mix A-based reactions, the 128 bp fragment was not amplified at all, whereas the products generated by the other two primer pairs were amplified at different rate...

Quantitation of GAD67 Gene Expression in Prefrontal Cortex of Schizophrenia Patients Using the iCycler iQ Detection System and Molecular Beacons, Rev A

... ethidium bromide-stained agarose gels. In contrast to their respective cDNA templates, no PCR products could be detected with gel electrophoresis when RNA samples were used. Random RNA samples (n = 10) were also subjected to real-time PCR using β-actin primers and a molec...

Biolistic Gene Transfer to Generate Transgenic Schistosomes, Rev A

...FP activity (results not shown). In contrast to the air-pressure conditions of gene gun treatme...tomosoides sigmodontis (Jackstadt et al. 1999). In contrast to schistosomes, filariae are bigger and seem to be more resistant to mechanical stress. ...

Sub-Micron Gold Particles Are Superior to Larger Particles for Efficient Biolistic Transformation of Organelles and Some Cells

...r sets of particles used in these experiments. The contrast between the two types of particles in terms of the size and shape is particularly evident. Scanning electron microscopy has been used as a part of the quality control procedure to determine the average size, the variation in s...

Is Z' factor the best assessment for the quality of cellular assays delivering higher content?

... A common characteristic of cell-based assays (in contrast tomany in vitro assays) is that the statistical variation associatedwith control and treated sample populations is often significantlydifferent (Figure 1). This phenomenon may be both cell type- andtarget-dependent. The causes may be manifold, but in...

GenomiPhi amplification of FFPE tissue DNA for array CGH

...leotide–primed PCR (DOP-PCR). <P >In contrast to DOP-PCR, GenomiPhi™ DNA Amplification Kit provides WGA using a simple isothermal method (4). This method employs the unique biochemical properties of Phi29 DNA polymerase, a highly processive enzyme with excellent strand displacement and pro...

Laser Capture Microdissection (LCM) for the Analysis of Macrophage Gene Expression from Atherosclerotic Lesions

...-time quantitative RT-PCR. As shown in Fig. 3D, in contrast to the level of α-actin in RNA from whole sections, in the LCM-derived RNA, α-actin expression was at background levels after 40 cycles of amplification. These results show that lesional macrophage foam cells can be precisely and selectivel...

HPLC/MS/MS Analysis of Bitter Acids in Hops and Beer

... isomerization during the brewing process. In contrast to old traditional processes modern brewing techniques may use hop products such as extracts to achieve greater production volumes and improved batch consistency. In this study, bitter acid composition of different types of be...

Determination of Polar Organophosphorus Pesticides in Aqueous Samples by Direct Injection Using HPLC/MS/MS

... and omethoate are extremely water soluble and, in contrast to most other pesticides that are quoted in literature as highly polar (e.g. oxamyl, acidic pesticides, dichlorvos, mevinphos, dimethoate), not extractable (after the adequate pH adjustment) using the more common LLE or SPE procedures. GC-met...

A new wide field-of-view confocal imaging system and its applications in drug discovery and pathology

...tinguishing the neighboring fine details; and high contrast - making the details visible to the human eye or i...after being sliced into thin sections. 21 Imaging contrast can be realized by treating them with natural or synthetic dyes, a process called staining. 21, 22 ...

TissueRuptor System

...ator homogenization (Figure1). However, in contrast to traditional rotorstator homogenization, disposable probes enable visual control of the disruption procedure and can be discarded after use, for increased time savings and reduced cross-contamination. Reprod...

Kodak in vivo imaging system: precise coregistration of molecular imaging with anatomical X-ray imaging in animals

...imaging overlay techniques in which the dark-field contrast is superimposed on a reflection image of a...l instrumentation that combines dark-field contrast with penetrating radiographic anatomical imaging in one system. Kodak Image...

miRNeasy Mini Kit and miRNeasy 96 Kit

...er purification using the miRNeasy Kit, in contrast to samples prepared using an alternative kit. High-purity RNA RNA prepared using miRNeasy Kits is highly pure and ready for use in sensitive downstream applications. miRNeasy procedures elimina...

Improve Recovery and Reproducibility with Pre-Treatment of Analytical TSK-GEL G3000SWXL Size Exclusion Columns

...ssociated with the protein A purified fraction, in contrast to the lack of effect seen on recovery of HMW species from downstream purification steps (chromatographic polishing steps 1 and 2), has provided the opportunity to further characterize the high molecular weight fractions ...

Evaluation of RNA isolated from human tissues: quality control for surgical and postmortem samples

...egraded RNA at the time of collection. This is in contrast to RNA obtained from tissues collected from young, healthy animals or from cultured cells where it is reasonable to demand that all RNA samples have high integrity with RIN values greater than 8. Effect of Sample Source on RNA...

To be a player in the "Knowledge Economy," Wisconsin needs more tech workers

...on Tom Still: Ethics Board site offers welcome contrast to state IT mistakes Tom Still is president of the Wisconsin Technology Council. He is the former associate editor of the Wisconsin State Journal in Madison. The opinions expressed herein or statements made in the above column are solely those ...

Separating hope from hype in stem-cell research

...on Tom Still: Ethics Board site offers welcome contrast to state IT mistakes Tom Still: In a fast-paced economy, lawmakers must pick up speed Tom Still is president of the Wisconsin Technology Council. He is the former associate editor of the Wisconsin State Journal in Madison. The opinions expr...

Federal bioenergy lab will give Wisconsin a chance to shine

...on Tom Still: Ethics Board site offers welcome contrast to state IT mistakes Tom Still: In a fast-paced economy, lawmakers must pick up speed Tom Still: Legislature should look to Wisconsin's natural energy advantages Tom Still: Stem cells get most attention, but they are only part of Wisconsi...

Kind approach to leveraging biofuels

...on Tom Still: Ethics Board site offers welcome contrast to state IT mistakes Tom Still: In a fast-paced economy, lawmakers must pick up speed Tom Still: Legislature should look to Wisconsin's natural energy advantages Tom Still: Stem cells get most attention, but they are only part of Wisconsi...

Changes to U.S. patent law must nurture our culture of innovation

...ll Tom Still: Ethics Board site offers welcome contrast to state IT mistakes Tom Still: In a fast-paced economy, lawmakers must pick up speed Tom Still: Legislature should look to Wisconsin's natural energy advantages Tom Still: Stem cells get most attention, but they are only part of Wisconsi...