N-(Propargyl-PEG2)-DBCO-PEG3-Amine, TFA salt enables formation of triazole linkage with azide-bearing compound via copper catalyzed Click Chemistry. The amine group is reactive with carboxylic acids, activated NHS esters, carbonyls (ketone, aldehyde), etc. The propargyl group can be linked to azide-containing biomolecules via Click Chemistry. Reagent grade, for research purpose.
N-(Propargyl-PEG2)-DBCO-PEG3-Amine, TFA salt enables formation of triazole linkage with azide-bearing compound via copper catalyzed Click Chemistry. The amine group is reactive with carboxylic acids, activated NHS esters, carbonyls (ketone, aldehyde), etc. The propargyl group can be linked to azide-containing biomolecules via Click Chemistry. Reagent grade, for research purpose.
Usages:
For selective cultivation of bacteria especially Vibrio.
Principle:
Peptone provide carbon and nitrogen sources; sodium chloride to maintain osmotic equilibrium; higher pH can suppress the growth of coliform and other bacteria, it is conducive to the growth of Vibrio cholerae.
Formulation（per liter）:
Peptone 10g
Sodium chloride 10g
Final pH 8.5 ± 0.2
How to use：
1.Suspend 18g in 1L of distilled water, stirring heated to boiling to completely dissolve, autoclave at 121℃ for 15 minutes.
2.Diluted and treated samples.
Quality control：
| Item | The name and number of strain | Growth | Colony Color |
| 1 | Vibrio cholerae VbO | Good | Turbid broth |
| 2 | Escherichia coli ATCC25922 | Poor | — |
Storage: Keep container tightly closed, store in a cool, dry place, away from bright light. Storage period of 3 years.
Specifications: 250g/bottle
250g
endo-BCN-PEG12-NHS ester is a aqueous soluble PEG linker containing an NHS ester group and a BCN group. It can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The BCN group enable copper free click chemistry with azide-attached molecules. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
endo-BCN-PEG12-NHS ester is a aqueous soluble PEG linker containing an NHS ester group and a BCN group. It can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The BCN group enable copper free click chemistry with azide-attached molecules. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
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Library size selection is an enrichment of a specific range of library sizes for NGS library preparations. The NGS library preparation is related to the quality of the sequencing data. Precise NGS library size selection can increase sequencing efficiency, improve data quality, and reduce costs.
There are two types of sequencing technologies: short-read sequencing and long-read sequencing. Short-read sequencing uses DNA libraries that contain small insert DNA fragments of similar sizes, usually several hundred base pairs. The sequencing efficiency can be improved if the DNA size selection is in the right range. Cat.# 20104S and 20104L are the best kits for NGS library size selection of illumina paired-end 100 (PE100) sequencing with 100-200 bp library inserts; Cat.# 20105S and 20105L are the best kits for NGS library size selection of illumina paired-end 150 (PE150) sequencing with 150-300 bp library inserts; and Cat.# 20106S and 20106L are the best kits for NGS library size selection of illumina paired-end 300 (PE300) sequencing with 300-600 bp library inserts.
Long-read sequencing uses a large DNA fragment as input and makes very long reads. Usually, library size selection is preferred to remove smaller fragments. Cat.# 20110S and 20110L are the best kits for long-read sequencing size selection with DNA sizes >5 kb, and Cat.# 20111S and 20111L are the best kits for long-read sequencing size selection with DNA sizes >10 kb.
The magnetic beads, or SPRI (Solid Phase Reversible Immobilization) beads, is well used for the purification of DNA due to their reversible DNA binding. The NGS library can be size-selected by the magnetic beads or SPRI beads. The properties of the magnetic beads can be changed for a specific range of DNA binding. The contaminants and other unwanted components in the libraries can also be removed during size selection.
Specific ranges of NGS libraries can be selected using magnetic beads with different buffer compositions. The first DNA-beads binding step, also called the right-side clean-up, removes large NGS library fragments. The large NGS library fragments that bind to the beads are discarded with the beads pellet. The desired NGS library fragments in the supernatant are transferred to a new well, and new beads are added to the supernatant for the second beads-DNA binding, also called the left-side clean-up. After the rinsing step, the NGS library fragments with the dual selection are eluted in water or an appropriate buffer. The magnetic beads method has great advantages over time-consuming column purification and tedious gel-based purification.
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Library size selection for long-read sequencing only requires a single clean-up. In this case, only the large library fragments are bound to the beads, while other small library fragments are discarded with the supernatant. The selected larger library fragments are eluted in water or an appropriate buffer after the rinsing step.
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