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118 results about "Background selection" patented technology

Background selection describes the loss of genetic diversity at a non-deleterious locus due to negative selection against linked deleterious alleles. It is one form of linked selection, where the maintenance or removal of an allele from a population is dependent upon the alleles in its linkage group. The name emphasizes the fact that the genetic background, or genomic environment, of a neutral mutation has a significant impact on whether it will be preserved (genetic hitchhiking) or purged (background selection) from a population. In some cases, the term background selection is used broadly to refer to all forms of linked selection, but most often it is used only when neutral variation is reduced due to negative selection against deleterious mutations. Background selection and all forms of linked selection contradict the assumption of the neutral theory of molecular evolution that the fixation or loss of neutral alleles is entirely stochastic, the result of genetic drift. Instead, these models predict that neutral variation is correlated with the selective pressures acting on linked non-neutral genes, that neutral traits are not necessarily oblivious to selection. Because they segregate together, non-neutral mutations linked to neutral polymorphisms result in decreased levels of genetic variation relative to predictions of neutral evolution.

Corn whole genome SNP chip and application thereof

The invention relates to the field of molecular biology and genome breeding, and particularly discloses a corn whole genome SNP chip and application thereof. SNP loci covering a genetic expression area and SNP loci which are uniformly distributed in the whole genome are collected, after sifting, a high-throughput Infinium SNP chip of Illumina is prepared, and the chip comprises 500 probes of SNP markers shown in a detection list 1. By means of the selected SNP loci based on a large-scale sequencing result, specific signals which have reasonable frequency distribution, a low miss rate and low false positives are obtained, wherein 2/3 SNP loci are distributed in all the corn warm zone and tropical zone materials, and can be effectively used for selecting and utilizing the tropical zone materials; 426 SNP loci are functional markers, and are obviously relevant to kernel substance accumulation gene expression; an Infinium platform of Illumina has the advantages of being high in SNP typingdetection rate, high in repetitive rate, simple in detection and high in accuracy. The corn whole genome SNP chip can be used for corn germplasm resource molecular marker fingerprint analysis, corn linkage map construction, QTL locating, corn breeding material background selection and the like.
Owner:INST OF CROP SCI CHINESE ACAD OF AGRI SCI

Road background extraction and updating method with fusion of real-time traffic state information

The invention discloses a road background extraction and updating method with fusion of real-time traffic state information. The method comprises the steps of A, constructing a selectivity background frame extraction model according to the real-time road traffic operation state and an illumination variation estimation result; B according to the constructed selectivity background frame extraction model, sequentially conducting initial background selection, background updating area detection and background updating processing so as to achieve self-adaptation updating on a road background. According to the method, the selectivity background frame extraction model is constructed according to the real-time road traffic operation state and the illumination variation estimation result, the selectivity background frame extraction model with the fusion of the real-time traffic state information and illumination variation information is built on the basis of a traditional method, the adaptability of the traffic background is good, interference caused by sudden variation of traffic flows or excessive moving vehicles or illumination variation on background images is avoided, the interference resistance is strong, and the robustness is good. The road background extraction and updating method can be widely applied to the field of video traffic monitoring and image processing.
Owner:SUN YAT SEN UNIV +1

Efficient technical system for creating wide compatible rice recessive nucleic sterile line

The invention provides a method for accurately performing rice germplasm resource transformation by using molecular marker assistant selection, belongs to the field of rice molecular breeding, and particularly relates to backcross transformation and molecular marker assistant selection. The method comprises the following steps of: performing foreground selection by using DNA sequence difference causing gene function difference as a molecular marker (or using a marker tightly interlocked with two sides of a target gene), simultaneously performing background selection by using high-density simple sequence repeat (SSR) and single nucleotide polymorphism (SNP) molecular markers, and performing one-time three-way cross, two-time backcross, one-time selfing, one-time backcross and one-time selfing to quickly and accurately polymerize nuclear recessive male sterile genes and wide compatible genes in an excellent receptor parent so that the recovery rate of the recurrent parent reaches 99.5 percent and a middle material of a wide compatible rice recessive nucleic male sterile line is created. The method not only enriches the male sterile germplasm resource of rice, but also can promote the development of heterosis utilization potential among indica and round-grained subspecies. By the invention, the breeding cycle can be greatly shortened and the breeding efficiency and accuracy can be improved.
Owner:BEIJING WEIMING KAITUO CROP DESIGN CENT COMPANYLIMITED +1

Breeding method for directed improvement of tobacco black shank resistance by molecular marker-assisted selection

ActiveCN106498063AGood traits intactIncreased resistance to black shankMicrobiological testing/measurementEnvironmental effectTwo step
The invention discloses a breeding method for directed improvement of tobacco black shank resistance by molecular marker-assisted selection. The breeding method includes the steps: acquiring a molecular marker; performing molecular marker-assisted selection for five times. Existing excellent characteristics of Honghua Dajinyuan can be completely preserved, black shank resistance is enhanced, field growth is regular, and genetic characters are stable. A progressive two-step method assists in background selection, so that the workload of background molecular marker-assisted selection can be effectively decreased. The background recovery ratio of single plants with backcross 3-generation BC3F1 subjected to molecular marker-assisted selection can reach 97.5% or more and is greatly increased, and the breeding process is shortened. The harmful or adverse effect of foreground linkage drag on improved varieties is decreased by selection, and the excellent characteristics of improved initial varieties are effectively and comprehensively preserved. Large-scale field planting for phenotype screening is omitted in the whole directed improvement process, field workload is low, most of work is less affected by environments, and results are more accurate.
Owner:YUNNAN ACAD OF TOBACCO AGRI SCI

Method for freely replacing background of clock hanging piece on tabletop of mobile terminal

The invention provides a method for freely replacing the background of a clock hanging piece on a tabletop of a mobile terminal. The method comprises the following steps that: a mobile terminal system receives an instruction of adding the clock hanging piece to the tabletop, and adds a clock to the tabletop; a clock hanging piece module of the mobile terminal system judges whether the instruction of replacing the background of the clock hanging piece exist, namely clicking the hanging piece to select the background; a picture list module in a picture library of the mobile terminal system judges whether a self-defined picture is selected, returns to a background selection interface if the self-defined picture is not selected, and enters the cutting interface of the selected picture if the self-defined picture is selected; and a picture previewing and editing module in the picture library of the mobile terminal system judges whether the picture is cut, if the cutting is finished, the cut picture is used as the clock background, and the system returns to the self-defined picture list interface in a mobile telephone and a internal memory card if the cutting is not finished. The method is simple in operation, can freely replace the background of the clock hanging piece, and is extraordinarily humanized.
Owner:GUANGDONG BUBUGAO ELECTRONICS IND

Infant crawl autonomic movement induction training device

ActiveCN104107531ADecrease or increase difficultyImprove developmentStiltsCerebral palsiedProtection system
The invention belongs to the technical field of rehabilitation training aiming at cerebral palsy infant autonomic movement induction, and relates to an infant crawl autonomic movement induction training device. The autonomic movement induction training device is suitable for 0-3-year-old infants who have the dyskinesia after birth and cannot be cooperated with other kinds of training due to the cerebral injury. The device is composed of a body, a weight reduction protection system, a training board and a training portion. The body is a supporting and bearing system to facilitate movement and fixing. The weight reduction protection system is composed of a supporting frame, a sliding groove, a weight reduction sand pocket, a traction rope, a supporting rod, a chest welt pocket and the like. The two ends of the supporting frame are fixed to the two ends of the training board respectively. The training board is arranged on the body of the training device, and one end of the training board is connected with the body through a rolling shaft. A hydraulic adjusting system is fixedly arranged on the body of the training device, the top end of an ejector rod of the hydraulic adjusting system is fixed to the lower portion of the center of the training board, the other end of the training board is adjusted to be lifted up according to needs and inclined by a certain angle, and therefore the training difficulty is adjusted. The training portion comprises a single board computer, background selection and the training difficulty are stored in the single board computer, background music and information are stored, and all modules are independently selected by exercise therapists.
Owner:国家康复辅具研究中心 +1

Rapid directional improvement technology for wheat target traits

The invention belongs to the agricultural technology, and relates to the field of crop genetics and breeding. The invention relates to a rapid directional improvement technology for wheat target traits. The rapid directional improvement technology comprises the following steps of 1, hybridizing a receptor variety which does not contain a target trait gene and is used as a female parent and a donor wheat variety which contains the target trait gene and is used as a male parent to generate F1 seeds; carrying out backcross on the F1 seeds and receptor varieties to generate BC1 seeds; carrying out backcross on the selected single plant carrying the target trait gene and the receptor variety to generate BC2 seeds; and 2, planting the BC2 seeds in a greenhouse, carrying out KASP marker-assisted selection and whole genome background selection, and carrying out backcross on the selected single plant carrying the target trait gene and the receptor variety to generate BC3 seeds and the like. By means of the technology, in the wheat breeding process, rapid and accurate directional selection and directional improvement can be achieved on target traits, the new variety breeding period is greatly shortened, and the new variety breeding efficiency is improved.
Owner:SHIHEZI UNIVERSITY +1

Method used for modification of Jing Nongke 728 strain through molecular mark assisted rapid reduction of corn leaf intersection angles

The invention provides a method used for modification of Jing Nongke 728 strain through molecular mark assisted rapid reduction of corn leaf intersection angles. According to the method, two SSR molecular markers closely linked with corn liguliss gene lg1 are adopted, corn Jing 2416 is taken as a recurrent parent, a lg1 gene-containing liguliss corn selfing line is taken as a nonrecurrent parent,and hybridization, three times of backcross, molecular mark assisted prospect and background selection, and selfing are adopted so as to obtain a liguliss corn selfing line with a genetic background basically the same with that of the recurrent parent; the liguliss corn selfing line and Jing MC01 are combined, so that a compact type corn hybrid variety with the genetic background basically the same with that of the original hybrid variety and obviously reduced leaf intersection angles is obtained rapidly. The method is capable of saving almost one half breeding time, is capable of reducing leaf intersection angles of conventional hybrid varieties rapidly, promoting breeding of the compact type corn hybrid variety with obviously reduced leaf intersection angles, and is promising in application prospect.
Owner:BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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