1527 results about "Molecular Biology Technique" patented technology

A method of designing oligonucleotides useful in molecular biology techniques as PCR primers or in other techniques as identification and / or quantification probes is disclosed. The method permits designing specific oligonucleotides for the identification of a determined sequence in a metagenomic sample. The method includes selecting or constructing a database of reference sequences, selecting a subset of sequences belonging to target organisms, selecting candidate oligonucleotides from such sequences, depurating these candidate oligonucleotides according to hybridization specificity and thermodynamic stability criteria, obtaining a list of designed oligonucleotides that fulfill the hybridization specificity and thermodynamic stability criteria, producing materially by chemical synthesis the designed oligonucleotides, and selecting the oligonucleotides which comply with the requirements of the desired process.

The invention belongs to the technical field of molecular biology and relates to application of an exosome derived from human mesenchymal stem cells to preparation of medicines for antagonizing scars or tissue and organ fibrosis. According to the application, the high-purity and high-bioactivity exosome is obtained by subjecting healthy human umbilical cords to primary in-vitro culture, collecting liquid supernatant after amplification, performing low-temperature ultracentrifugation, purifying and the like; the exosome is used individually or added into medicines, health care products and cosmetics according to a proportion to be developed into a product with a bioactivity function, thereby being capable of regulating organism cell signal transduction effectively, inhibiting fibrocyte differentiation and then antagonizing the tissue and organ fibrosis and scar forming. Through experimental verification, the exosome can play a remarkable role in repairing promotion in hypertrophic scar after skin injury, particularly pathological fibrosis proliferation such as scar contracture of the joint parts, hepatic fibrosis and cardiac fibrosis, and is high in safety, little in toxicity and convenient to storage and transport, thereby being wide in application prospect.

The invention provides a gene knockout vector and a zebra fish glioma model thereof. The gene knockout vector is obtained by connecting a target sequence to plasmids capable of expressing CRISPR-Cas9gene editing system related enzymes, and the target gene is a p53, Rb1 or Nf1 gene. The CRISPR / CAS9 technology is utilized for performing targeted knockout of rb1, nf1 and tp53 genes, an established transgene-induced malignant glioma zebra fish model can observe occurrence of malignant gliomas, tumor-induced angiogenesis and glioma stem cell generating processes through real-time fluorescence, andthe difference of pathogenesis of gliomas under different genetic background conditions is studied through the molecular biotechnology.

Disclosed is a method using an alkane response element (ARE) from, e.g., Acinetobacter spp. to (i) identify and clone hydrocarbon biosynthesis genes, (ii) identify and clone hydrocarbon transporter genes (iii) identify and clone hydrocarbon response genes. Screening cells were developed that expressed a transcriptional activator, e.g., alkR, and included a reporter gene, e.g., GFP operatively linked to an ARE promoter, e.g., the alkM promoter. The cells were transformed with libraries from organisms capable of hydrocarbon biosynthesis. Transformed cells that expressed the reporter gene harbored library-derived genes involved in one or more of the above-mentioned processes; and these genes were isolated from the cells using standard molecular biology techniques. Additional systems were designed wherein screening cells also expressed a gene identified in the original screen, e.g., an additional hydrocarbon pathway gene, e.g., an enhancer.

The invention discloses an SSR (Simple Sequence Repeat) core primer group developed based on whole genome sequence of foxtail millet and an application of the SSR core primer group, and belongs to the technical field of molecular biology. The core primer group comprises 30 pairs of primers, wherein nucleotide sequences are represented by SEQ ID NO. 1-60. The primer has advantages of clear electrophoretic band and rich polymorphism, and is uniformly distributed and stable in amplification. The invention also provides the application of the SSR core primer group in identifying the genetic diversity and variety of the foxtail millet. The primer group can be used for precisely and quickly identifying the variety of the foxtail millet and precisely reflecting a genetic relationship among the varieties of the foxtail millet.

The invention belongs to the technical field of molecular biology and discloses an extracting method of polysaccharide and polyphenol plant genomes. The method includes: grinding plant materials, then adding a nucleic acid separation buffer solution and 2-mercaptoethanol, well mixing, and placing into water bath; centrifuging in a centrifuge, and then discarding supernate; adding a 1x PBS solution, well mixing on a grinding instrument in an oscillation manner, and discarding supernate after centrifuging; adding preheated 3x CTAB lysate into sediment, well mixing, and performing splitting decomposition under water bath; adding equal-volume phenol / chloroform / isoamyl alcohol mixed liquor, well mixing and centrifuging; taking supernate, adding equal-volume chloroform / isoamyl alcohol mixed liquor, well mixing and centrifuging; taking supernate, adding NaCl and icy isopropanol, well mixing, and precipitating for 1-3 hours; taking out and centrifuging, then washing sediment with ethanol, and adding TE for dissolving after air drying so as to complete the extracting process. The extracting method has the advantages that polysaccharides and polyphenols can be removed effectively, the influence of the polysaccharides and polyphenols on nucleic acid extraction is reduced, and DNA quality and concentration are increased.

Extracts obtained from the genus Hippophae or other plant sources or compositions produced by chemical or molecular biological techniques each having in common certain moieties in amounts effective when combined with reproductive cells to reduce the loss of function.