The BiosearchTech Blog

Biosearch Technologies Expands Licensing of QIAGEN Scorpions® Patents

Biosearch Technologies today announces that it has entered into a new license relationship with QIAGEN (NASDAQ: QIA, Frankfurt Prime Standard) providing broad commercialisation rights to Scorpions Primers.  This agreement allows Biosearch the right to manufacture, catalog, and sell Scorpions primer assays into the research, applied, and infectious disease testing markets.

To read the entire story, read the full press release.

Easier Online Ordering through RealTimeDesign™ Software

RealTimeDesign (RTD^TM) Software from Biosearch Technologies is an easy to use, yet powerful assay design application for real-time qPCR. This user-friendly software is available free of charge through our website and requires NO installation. We have recently updated RealTimeDesign software with more options and improvements to the ordering process:

• Option to rename sequences
• Chance to review sequences before purchase
• Purification selection for primers
• Larger selection of synthesis scales
• Improved transition from design to order

 If you're not already familiar with RealTimeDesign software, this powerful design application puts you a few clicks away from:

• Designing assays for Multiplex qPCR, SNP Genotyping, and Gene Expression
• Designing BHQ Probes, BHQplus^TM Probes, Amplifluor® Primers, and matching optimal primer pairs
• Designing anywhere from single assays to high-throughput batches
• Saving a list of your custom designs in your account "Design Run History"
• Choosing from Biosearch's wide selection of dyes including our very own Black Hole Quencher® (BHQ®) dye

Designing Dual-Labeled BHQ® Probes has never been easier. To start using RealTimeDesign Software, visit www.biosearchtech.com/realtimedesign and create an account today!

See Also:

• RealTimeDesign Quickstart Guide
• RealTimeDesign Brochure
  

Buy One qPCR Probe & Get One FREE

Buy one CAL Fluor® or Quasar® -BHQ® Probe and get a FREE ValuProbe^TM BHQ Probe* and calibration standard ($190 in savings!). Simply enter promo code CFQVP upon checkout to receive this offer. Take advantage of this promotion before it expires on June 30, 2010.

Biosearch Technologies offers CAL Fluor and Quasar dyes that span the spectrum, for 2-plex, 3-plex, 4-plex, 5-plex, and even 6-plex PCR. They perfectly complement the Black Hole Quencher dyes, a true dark quencher that extinguishes signal from any fluorophore.

This promotion is for one-time use only and limit one free probe per customer. Multiple promotions and discounts may not be combined. 25 nmol synthesis scale probes excluded.

Visit our Dual-Labeled BHQ Probes webpage for more details about our products and this current promotion.

Black Hole Scorpion® Primers - Killer probes for qPCR

A "Referral from the Doctor" Blog Article-  

Scorpions®Primers are dual-labeled FRET probes that combine a Molecular Beacon®-like probe structure and a PCR primer element in a single oligonucleotide, allowing for specific target amplification and advanced target detection through a unimolecular or single oligonucleotide driven mechanism.

Q. What parts are similar to dual-labeled Black Hole Quencher® (BHQ) probes?
A BHQ dye and a 5'-fluorophore covalently bound to the oligonucleotide termini.

Q. What parts are similar to Molecular Beacons?
A target-binding region, comprised of a stem-loop structure resembling a "closed hairpin".

Q. What parts are unique?
• A 3' template-binding region representing the primer region;
• A PCR blocker, often a hexethylene glycol modification linker sequence and;
• An internal thymidine labeled with a BHQ.

Q. What is its native conformation at melting and annealing temperatures?
Melted - random coil conformation
Annealed (perfect match) - stable double helix, probe-target hybrid (high signal to noise ratio)
Annealed (mismatch) - hairpin conformation (FRET quenched, no signal)

Q. How does it yield signal?
The target-binding region is located within the loop portion of the hairpin conformation and sets atop an annealed stem region. When a perfectly matched complementary sequence is available, the probe region hybridizes to the complementary sequence. Conformational changes associated with hybridization force the hairpin stem region open, separating the fluorophore and quencher, decreasing FRET quenching and releasing fluorescence.

Q. How does it amplify its own target?
During the first round of amplification, the template-binding region hybridizes to the complementary sequence of the template DNA and extends to form a primer extension product. The primer extension product contains the desired target sequence. The probe region remains in a closed hairpin conformation until the next cycle of amplification. The presence of a PCR blocker in the linker sequence prevents the polymerase-mediated duplication of the probe region.

Q. How does it detect the target it has amplified?
During the second round of amplification, the target-binding region of the probe sequence hybridizes to the complementary sequence within the primer extension product. Hybridization forces the hairpin open, releasing fluorescence.
Q. What happens with each consecutive PCR cycle?
The primer extension product and connected probe region, establishes a temperature-dependent equilibrium between the hybridized conformation and the random coil conformation. Therefore, each Scorpions Primer accounts for only one product amplification per experiment.
The unimolecular mechanism allows for the linear amplification of targets with initially high copy number. For the quantitative analysis of low copy number sequences, it is essential that the reverse primer be included in the PCR master mix to enable exponential amplification of the target sequence.

Q. What if the available target is a mismatch?
Mismatched hybrids are less stable than reformation of the hairpin stem. Therefore signal is only produced when the target binding region hybridizes to a perfect-match target sequence. This enables specificity of signal generation to be accurate at the level of single nucleotide polymorphisms (SNP).

• Rapid hybridization - the proximity of the probe region and the target sequence kinetically favors formation of the probe-template hybrid over template duplex re-annealing. The unimolecular event enables rapid signal generation during hybridization.
• High signal to noise ratio - the efficiency of FRET quenching, when in the unhybridized state, decreases errant fluorescence and enables a high signal to noise ratio with hybridization.
• High specificity - single base mismatches can be detected.
• Post-PCR melt curve analyses - Scorpions Primers do not require the enzymatic activity of a polymerase for fluorescent signal generation in qPCR and under non-hydrolytic conditions allow for post-PCR melt curve analyses.
Applications: Single and multiplexed, quantitative and qualitative, real-time and endpoint qPCR analyses; environmental analyses; gene quantification and allelic discrimination.

Written by: Christina Ferrell, Ph.D., Technical Applications Specialist

Whitcombe, D.M., Theaker, J., Gibson, N.J., Little, S. "Methods for detecting target nucleic acid sequences". United States Patent 6270967. Aug. 07, 2001
Whitcombe, D., Theaker, J., Guy, S.P., Brown, T., Little, S. "Detection of PCR products using self-probing amplicons and fluorescence". Nature Biotechnology 17 (1999): 804-807.
Thelwell, N., Millington, S., Solinas, A., Booth, J., Brown, T. "Mode of Action and application of Scorpion primers to mutation detection". Nucleic Acids Research 28(19) (2000): 3752-3761.
Solinas, A., Brown, L.J., McKeen, C., Mellor, J.M., Nicol, J.T.G., Thelwell, N., Brown, T. "Duplex Scorpion primers in SNP analysis and FRET applications". Nucleic Acids Research 29(20) (2001): e96.
Bustin, S.A. A-Z of Quantitative PCR (IUL Biotechnology Series). La Jolla, California: International University Line, 2004.

 

Molecular Beacons - Lights in the storm

A "Referral from the Doctor" Blog Article-

Molecular Beacons are a special type of dual-labeled oligonucleotide probe. Beacons are hairpin loop structures with a 5'-fluorophore and a 3'-quencher dye. The stem region is a short sequence of 5-7 complementary bases. The loop sequence is complementary to the target sequence. In the absence of target or prior to amplification, the stem anneals to form a closed hairpin conformation which holds the reporter and quencher close together to enable efficient FRET quenching and to promote contact or static quenching. The beacon is engineered such that the probe-target hybrid is more stable than the closed hairpin conformation, which is respectively more stable than a probe-mismatch hybrid. Therefore it is only in the event of a perfect-match hybridization that signal occurs, allowing beacons to discriminate mismatches as small as a single nucleotide polymorphism (SNP).

Structure

Q: What parts are similar to dual-labeled Black Hole Quencher® (BHQ) probes?
A: A 5'-fluorophore and a 3'-BHQ dye covalently bound to the oligonucleotide termini.

Q: What parts are unique?
A: A target-binding region comprised of a stem-loop structure resembling a "closed hairpin".

Q: What is its native conformation at melting and annealing temperatures?
A: Melted - random coil conformation
Annealed (perfect match) - stable double helix, probe-target hybrid (high signal to noise ratio)
Annealed (mismatch) - hairpin conformation (FRET quenched, no signal)

Mechanism

Q: How does it yield signal?
A: The target-binding region is located within the loop portion of the hairpin conformation and sets atop an annealed stem region. When a perfectly matched complementary sequence is available, the probe region hybridizes to the complementary sequence. Conformational changes associated with hybridization force the hairpin stem region open, separating the fluorophore and quencher, decreasing FRET quenching and releasing fluorescence.

Q: What happens with each consecutive PCR cycle?
A: 1. At high temperatures target DNA duplexes and Molecular Beacons are melted and maintain random coil conformations.
2. As the reaction cools to temperatures appropriate for the binding of primers and targets, the beacon will reach an equilibrium between the hairpin and hybridized states. This equilibrium depends on the availability of a perfect-match target, whose binding by the probe is thermodynamically favored, by design, over the hairpin conformation. This ensures that the molecular beacon can hybridize when appropriate target is available. In the hybridized conformation the reporter and quencher dyes are separated, releasing fluorescence.
3. During polymerization, the beacon is dislodged from the target sequence, refolds into and maintains the hairpin conformation until the next cycle of amplification. The increase in fluorescence intensity with repeated PCR cycles indicates the accumulation of product and allows for accurate quantification of template.

Q: What if the available target is a mismatch?
A: Mismatched hybrids are less stable than reformation of the hairpin stem. Therefore signal is only produced when the target binding region hybridizes to a perfect-match target sequence. This enables specificity of signal generation to be accurate at the level of single nucleotide polymorphisms (SNP).

• High signal to noise ratio - the efficiency of FRET quenching, when in the unhybridized state, decreases errant fluorescence and enables a high signal to noise ratio with hybridization.
• High specificity - single base mismatches can be detected.
• Post-PCR melt curve analyses - Molecular Beacons do not require the enzymatic activity of a polymerase for fluorescent signal generation in qPCR and, under non-hydrolytic conditions, allow for post-PCR melt curve analyses.
Applications: Single and multiplexed, quantitative and qualitative, real-time and endpoint qPCR analyses; allelic discrimination; SNP analysis; DNA microarray-immobilized probes and biosensors and; as nuclease-resistant antisense probes for detection RNA in vivo.

Written by: Christina Ferrell, Ph.D., Technical Applications Specialist

Tyagi, S. and Kramer, F.R. "Molecular beacons: probes that fluoresce upon hybridization". Nature Biotechnology 14 (1996): 303-308.
Bonnet, G., Tyagi, S., Libchaber, A., Kramer, F.R. "Thermodynamic basis of the enhanced specificity of structured DNA probes". Proc Natl Acad Sci. 96 (1999): 6171-6176.
Marras, S.A.E., Kramer, F.R., Tyagi, S. "Multiplex detection of single-nucleotide variations using molecular beacons". Genet Anal, 14 (1999): 151-156.
Marras, S.A.E., Kramer F.R., and Tyagi, S. "Genotyping single nucleotide polymorphisms with molecular beacons". Single nucleotide polymorphisms: methods and protocols (v. 212). Ed. P.Y. Kwok. Totowa, NJ: The Humana Press, 2003. 111-128.
Vet, J.A.M. and Marras, S.A.E. "Design and optimization of molecular beacon real-time polymerase chain reaction assays". Oligonucleotide synthesis: Methods and Applications (v. 288). Ed. P. Herdewijn. Totowa, NJ: Humana Press, 2004. 273-290.
Bustin, S.A. A-Z of Quantitative PCR. (IUL Biotechnology Series). La Jolla, California: International University Line, 2004.
Broude, Natalia E. "Molecular Beacons and Other Hairpin Probes". Encyclopedia of Diagnostic Genomics and Proteomics. (2005): DOI: 10.1081/E-EDGP 120020717. 846-850
Public Health Research Institute. "Designing Molecular Beacons". www.molecular-beacons.org

 

Dual-labeled BHQ probes - Performance to “dye” for

A "Referral from the Doctor" Blog Article-  

A BHQ® probe is a dual-labeled oligonucleotide covalently labeled with a fluorophore and a Black Hole Quencher® (BHQ) dye.

Q. What are the main components of a dual-labeled Black Hole Quencher® (BHQ) probe?

• An oligonucleotide, typically 30 bases long
• A 3' BHQ dye
• A 5'-fluorophore (reporter) dye

Q. What is its native conformation at melting and annealing temperatures?
Melted - random coil conformation
Unhybridized - unrestricted hairpin, FRET-quenched (no signal)
Hybridized- stable double helix, probe-target hybrid (signal)

Q. How does it yield signal?
When a complementary sequence is available, the probe hybridizes to the complementary sequence. Conformational changes associated with hybridization separate the fluorophore and quencher, decreasing FRET quenching and releasing fluorescence.
Q. What happens with each consecutive PCR cycle?
1. Heat melts or denatures the probe, sense and antisense strands of a DNA duplex.
2. As temperatures cool, hydrophobicity and electrostatics promote dye-dye attractions and enhance fluorescent quenching.
3. At annealing temperatures, the primers and the BHQ probe anneal to their complementary sequences within the target DNA. Conformational changes during hybridization separate the dyes which decreases FRET quenching thus releasing fluorescence.
4. During elongation, the DNA polymerase incorporates nucleotides complementary to the strand as it progresses in a 5' to 3' direction from the primer. When the polymerase encounters the 5'-end of the probe, it cleaves off the nucleotide, or a flap of nucleotides, with the bound reporter dye, thereby permanently separating the reporter and quencher dyes.

.

Dual-labeled BHQ probes have replaced earlier reporter-quencher dye pairings, such as FAM-TAMRA or FAM-DABCYL. In such sub-optimal probes, the quencher has inherent limitations such as auto-fluorescence or insufficient quenching at certain wavelengths which limit the choice of quenchable fluorophores. In contrast, the BHQ dyes:

• are highly efficient dark quenchers;
• have broad absorption spectra;
• and yield high signal to noise ratios.

BHQ dyes can be paired with all common reporter dyes emitting between the ultraviolet and infrared wavelengths, thereby making multiplexed hybridization assays easy to design and interpret.
Applications: Single and multiplex, quantitative and qualitative, real-time and endpoint PCR analyses; allelic discrimination; and SNP detection.

Written by: Christina Ferrell, Ph.D., Technical Applications Specialist

Didenko, V.V. "DNA probes using Fluorescence Resonance Energy Transfer (FRET): Designs and Applications". BioTechniques 31 (2001): 1106-1121. (Review)
Bustin, S.A. A-Z of Quantitative PCR. (IUL Biotechnology Series). La Jolla, California: International University Line, 2004.
Ranasinghe, R.T., Brown, T. "Fluorescence based strategies for genetic analysis". Chem. Commun. (2005): 5487-5502.
Johansson, M.K. "Choosing Reporter-Quencher Pairs for Efficient Quenching Through Formation of Intramolecular Dimers." Methods in Molecular Biology (v. 335, ch. 2). Ed. V.V. Didenko. Totowa, NJ: Humana Press, 2004. 17-29.
Marras, S.A.E. "Fluorescent Energy Transfer Nucleic Acid Probes: Designs and Protocols" Methods in Molecular Biology (v. 335, ch. 7). Ed. V.V. Didenko. Totowa, NJ: Humana Press, 2004. 3-16.
Biosearch Technologies website. Black Hole Quencher Dyes, www.biosearchtech.com/support/applications/dyes-from-biosearch-technologies
Biosearch Technologies website. Genotyping-qPCR, www.biosearchtech.com/support/applications/genotyping-qpcr

The Grand Ballet: Wine and Biotechnology

At the third qPCR Symposium, held November 9th -12th in Millbrae, CA, ETS laboratories (ETS) scientist Rich DeScenzo gave a compelling presentation describing the inherent difficulties associated with wine production and quality control. Biosearch Technologies, Inc. is proud of its collaborative efforts with ETS to produce the world's first wine spoilage test kit. Biosearch manufactures the biotechnology used in these test kits, namely Scorpions® Primers, designed by ETS scientists for the identification and quantification of microbes at each stage of fermentation in the maturing wine product. Before we present the technology and methods used in wine spoilage testing, we want to present an overview of what role genetic testing has in the development of aromas and flavors in our favorite dinner libation. The Grand Ballet is an extraction taken from the presentation of Dr. DeScenzo, paraphrased and presented with a bit of artistic license, with permission from ETS. We hope you enjoy it.

The Grand Ballet

The biological conversion of sugars to alcohol and malic acid to lactic acid are backdrops to the grand ballet of yeast and bacteria - the white hat microbe and the dark sinister microbe rising and falling with the tides of aerobic and anaerobic conditions. Wine spoilage and the preemptive detection of microbes and yeast that cause spoilage is an art in and of itself. Spoilage comes in two flavors, if you'll excuse the pun: overt and smelly or covert and disappointing. The cast of characters in this drama are either yeast bi-products including:

ethyl acetate - the fruity taste;
sulfides - the complex and misunderstood;
aldehydes - the cider aroma;
4-ethyl phenols with their "wet dog" odor;

or bacterial bi-products which confer the following properties on the unsuspecting libation:

acetic acid, - the spoiler, aka vinegar taste;
biogenic amines - the aroma thieves;
vermin - lysine degradation leaving a "mousy" aftertaste.

Whether a microbe is a "spoiler" or not is dependent upon their timing during the fermentation and bottling process. As the backdrop of chemistries change from filling the barrel to opening the bottle, the wine detective must use available tools to detect the spoiler, identify it, and deter its continued growth. In the detective's kit are all the tools he needs to solve the case and bring this ballet to a refined and tasty wine delivery.

The process of wine production is described as "managing a biological process". The key is to manage without draconian interaction, or "minimal touch" as Dr. DeScenzo puts it. It is the detection of these spoiler characters, yeast or bacteria, in all stages of wine development that enables the wine maker to preemptively curtail their uncontrolled or undesirable growth. The ETS Scorpions® Wine Spoilage Detection Kit contains the primary components necessary to provide the winery with high quality diagnosis and quantification of yeast or bacteria. Scorpions Primers were uniquely designed to detect specific members of the yeast and bacterial families. Multiplex hybridization assays of up to 4 Scorpions Primers are done at various stages of the fermentation process. The Scorpions Primers are labeled with CAL Fluor®, Quasar® and BHQ® dyes, which provide:

• Specific and sensitive detection
• Large dynamic range of detection (10 through 10 million cells)
• Multiplexing capability
• High signal to noise ratio
• Rapid intramolecular signaling

Despite the capabilities of the Scorpions Primers, there are a few challenges which accompany multiplexing experiments, including: intermolecular interactions, the consideration of emission spectral overlap upon dye selection, and the need for easily interpretable data of biological relevance.

Other non-chemistry related issues that confound the analysis and detection of spoilers include variability within the sampling process. Collecting representative samples of the wine is a truly difficult hurdle for wineries to overcome. The difficulty is due to varying collectors, stratification of the wine over time, and the necessity to homogenize the wine before testing. In addition to the process of sample collection, there is the very nature of wine matrix diversity - the change from grape juice to wine, as well as the different types of varietals and wine styles to consider. Examples include: light, sterile-filtered white wines, which are easy to test; and heavy, unfiltered red wines, which are difficult to test. Each wine category has different levels of inhibitors that can interfere with cell lysis or the PCR reaction. The Scorpions diagnostic assay must be able to generate accurate results at each phase of production and with different wine varietals and styles.

Target number variability is another issue further complicating the use of qPCR in the industry. High target number increases the potential for cross contamination between wells on the PCR plate. When emission spectra overlap and interfere in individual channel analysis, cross-talk between channels of a PCR machine occurs and makes data interpretation more difficult. Finally, the diagnostic kit must be compatible across multiple platforms so the world can readily accept the kit upon market launch. It is therefore essential that the kit provides universally usable reagents that make analysis and data interpretation platform-independent and easy to conduct. Currently the Scorpions Wine Spoilage Kit is used in the US, Europe, and Australia as a preemptive screening tool.

ETS Laboratories is the first lab to adapt genetic testing to the wine industry. Over the past seven years, ETS has worked closely with Biosearch Technologies on the design and development of Scorpions primers for qPCR-based wine spoilage kits. The advancement of this technology will yield tremendous benefits to wineries by improving the speed and accuracy of their wine analysis. Genetic testing has the power to detect small populations of target organisms and in conjunction with other testing techniques can be implemented as an effective diagnostic tool in the wine production industry.

For more on ETS laboratories, visit their website at http://www.etslabs.com/. To learn more about Scorpions Primers and the qPCR methodology, visit our website at http://www.biosearchtech.com.

*Scorpions Primers are a product of DxS.

Bringing Back a Champion: Competitive Quantitative Real-time RT-PCR

A "Referral from the Doctor" Blog Article-

Competitive qRT-PCR has become a lost art. Early titans of probe-based PCR used this technique to minimize variability between samples and experiments due to differences in reverse transcription and amplification efficiency. This technique facilitates the absolute measurement of initial gene target copy number based on known copy numbers of a control template.

This is accomplished through the addition of an internal control, a competitor sequence to the mRNA target in the sample. The competitor sequence is similar enough to use the same primer pairs as the target sequence but has a unique central sequence allowing for analysis with a different probe and reporter. Plasmid DNA or in-vitro transcribed RNA is commonly used as a competitor sequence and standard for quantification. To detect the initial copy number of a gene of interest, multiple replicates of a fixed amount of the target mRNA are dispensed into tubes. In the same tubes, 10 fold serial dilutions of competitor RNA are "spiked" in sequentially. Using one set of primers and two fluorogenic probes labeled with different dyes, real-time PCR data can be collected for both sequences simultaneously.

To determine copy number, the mean Cycles to Threshold (CT) values from the target sequence and the mean CT values of the competitor serial dilutions are plotted on the y axis, against the known copy number of the competitor sequence on the x axis. The number of initial copies of the target gene can be calculated from the theoretical equivalence point, where the CT of the target gene equals the CT of the competitor sequence - the point of intersection for each linear plot. It is essential that the efficiency of both amplifications be greater than 88% and furthermore within 5% of each other for accurate analysis.

This method of quantitative PCR is returning to the forefront of gene expression analysis, particularly for low expressing genes or those difficult to amplify. Success in the modern age is dependent upon the equipment capability, the stringency of validation and selection of fluorogenic probes. For a catalog of available probe formats, visit: http://www.biosearchtech.com/products/fluorogenic-probes-and-primers

Thus, we can rise above and see beyond because we stand on the shoulders of giants.
-concept attributed to Bernard of Chartres

Written by: Christina Ferrell, Ph.D., Technical Applications Specialist  

References:
H. Tani, T. Kanagawa, S. Kurata, T. Teramura, K. Nakamura, S. Tsuneda, N. Noda. Quantitative method for specific nucleic acid sequences using competitive polymerase chain reaction with an alternately binding probe. Anal. Chem. (2007) 79(3):974-979
E. Barbieri, G. Riccioni, A. Pisano, D. Sisti, S. Zeppa, D. Agostini, V. Stocchi. Competitive PCR for quantitation of a cytophaga-flexibacter-bacteroides phylum bacterium associated with the tuber borchiivittad. Mycelium. Applied and Environmental Microbiology (2002)68(12):6421-6424
C. Orlando, P. Pinzani, M. Pazzagli. Developments in Quantitative PCR.ClinChem Lab Med (1998) 36(5):255-269

BIOSEARCH TECHNOLOGIES TAKES LICENSE TO CDC H1N1 SIGNATURES AND INFLUENZA A SUB-TYPING PATENT

Biosearch Technologies announced today that the company has licensed from the CDC the novel H1N1 Influenza signatures along with the Influenza A sub-typing panel signatures.  This licensing agreement with the CDC makes Biosearch Technologies the first oligo manufacturer to have the right to manufacture and sell dual-labeled probes and primers bearing the H1N1 and Influenza A sub-typing signatures.

To read the entire story, read the full press release.

DoD Issues SBIR Grants to Biosearch Technologies

Biosearch Technologies has been selected for two Small Business Innovative Research (SBIR) grants from the Department of Defense (DoD). Both Phase 1 grants calls for the development of highly sensitive analyte specific reagents (ASRs) for a total of twelve pathogens.  The ASRs are qPCR based, but modified for field deployment.  Both grants include the following target pathogens: Dengue, Rift Valley Fever, Sand Fly Fever, Crimean-Congo Hemorrhagic Fever, Tick-Borne Encephalitis, Chikungunya, causative agents of typhus, spotted fever, anaplasmosis, Ehrlichioses, and Q fever.  If Phase I turns out to be a success, Biosearch expects this project to lead into a multiyear Phase II award.

To read the entire story, read the full press release.

Or, read more about the products and services Biosearch offers for ASR manufacturing.