New trends towards a marker-free system for gait analysis

2000 ◽  
Author(s):  
Elodie F. Calais ◽  
Franck Marzani ◽  
Louis Legrand ◽  
Alain Jacquemard
Keyword(s):  
Gait Analysis ◽  
Free System ◽  
Marker Free

Analysis and tracking of human gait via a marker-free system

2000 ◽  
Author(s):  
Elodie F. Calais ◽  
Louis Legrand
Keyword(s):  
Human Gait ◽  
Free System ◽  
Marker Free

scholarly journals A marker-free system for highly efficient construction of vaccinia virus vectors using CRISPR Cas9

2015 ◽  
Vol 2 ◽  
pp. 15035 ◽  
Author(s):  
Ming Yuan ◽  
Xuefei Gao ◽  
Louisa S Chard ◽  
Zarah Ali ◽  
Jahangir Ahmed ◽  
...  
Keyword(s):  
Vaccinia Virus ◽  
Free System ◽  
Virus Vectors ◽  
Highly Efficient ◽  
Efficient Construction ◽  
Marker Free

scholarly journals Screening for recombinants of Crambe abyssinica after transformation by the pMF1 marker-free vector based on chemical selection and meristematic regeneration

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Weicong Qi ◽  
Iris E. M. Tinnenbroek-Capel ◽  
Elma M. J. Salentijn ◽  
Jan G. Schaart ◽  
Jihua Cheng ◽  
...  
Keyword(s):  
Gene Fusion ◽  
Negative Selection ◽  
Free System ◽  
Crambe Abyssinica ◽  
Stepwise Selection ◽  
Recombinant Cells ◽  
Extremely High Frequency ◽  
Marker Free ◽  
Dna Fragment ◽  
Chemical Selection

Abstract The T-DNA region of pMF1 vector of marker-free system developed by Wageningen UR, has Recombinase R-LBD gene fusion and nptII and codA gene fusion between two recombination sites. After transformation applying dexamethasone (DEX) can activate the recombinase to remove the T-DNA fragment between recombination sites. The recombinant ought to be selected on 5-fluorocytocine (5-FC) because of codA converting 5-FC into 5-fluorouracil the toxic. A PMF1 vector was transformed into hexaploid species Crambe abyssinica. Two independent transformants were chosen for DEX-induced recombination and later 5-FC selection. In contrast to earlier pMF1 experiments, the strategy of stepwise selection based on meristematic regeneration was engaged. After a long period of 5-FC selection, recombinants were obtained successfully, but most of the survivors were wildtype and non-recombinant. The results revealed when applying the PMF1 marker-free system on C. abyssinica, 1) Increasing in the DEX concentration did not correspondingly enhance the success of recombination; 2) both of the DEX-induced recombination and 5-FC negative selection were apparently insufficient which was leading to the extremely high frequency in chimerism occurring for recombinant and non-recombinant cells in tissues; 3) the strategy of stepwise selection based on meristem tissue regeneration was crucial for successfully isolating the recombinant germplasm from the chimera.

scholarly journals Using New Camera-Based Technologies for Gait Analysis in Older Adults in Comparison to the Established GAITRite System

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 125 ◽  
Author(s):  
Anika Steinert ◽  
Igor Sattler ◽  
Karen Otte ◽  
Hanna Röhling ◽  
Sebastian Mansow-Model ◽  
...  
Keyword(s):  
Older Adults ◽  
Gait Analysis ◽  
Microsoft Kinect ◽  
Gait Patterns ◽  
Camera Systems ◽  
Gait Parameters ◽  
Marker Free ◽  
High Level ◽  
Almost All ◽  
Space Requirements

Various gait parameters can be used to assess the risk of falling in older adults. However, the state-of-the-art systems used to quantify gait parameters often come with high costs as well as training and space requirements. Gait analysis systems, which use mobile and commercially available cameras, can be an easily available, marker-free alternative. In a study with 44 participants (age ≥ 65 years), gait patterns were analyzed with three different systems: a pressure sensitive walkway system (GAITRite-System, GS) as gold standard, Motognosis Labs Software using a Microsoft Kinect Sensor (MKS), and a smartphone camera-based application (SCA). Intertrial repeatability showed moderate to excellent results for MKS (ICC(1,1) 0.574 to 0.962) for almost all measured gait parameters and moderate reliability in SCA measures for gait speed (ICC(1,1) 0.526 to 0.535). All gait parameters of MKS showed a high level of agreement with GS (ICC(2,k) 0.811 to 0.981). Gait parameters extracted with SCA showed poor reliability. The tested gait analysis systems based on different camera systems are currently only partially able to capture valid gait parameters. If the underlying algorithms are adapted and camera technology is advancing, it is conceivable that these comparatively simple methods could be used for gait analysis.

Contribution to a marker-free system for human motion analysis

2002 ◽  
Vol 11 (3) ◽  
pp. 381 ◽  
Author(s):  
Elodie Calais ◽  
Louis Legrand ◽  
Yvon Voisin ◽  
Alain Diou
Keyword(s):  
Motion Analysis ◽  
Human Motion ◽  
Human Motion Analysis ◽  
Free System ◽  
Marker Free

scholarly journals Regulated expression of site-specific DNA recombination for precision genetic engineering of apple

2005 ◽  
Author(s):  
John L. Norelli ◽  
Moshe Flaishman ◽  
Herb Aldwinckle ◽  
David Gidoni
Keyword(s):  
Genetic Engineering ◽  
Genomic Research ◽  
Fruit Crops ◽  
Selectable Markers ◽  
Free System ◽  
Inducible Promoters ◽  
Marker Excision ◽  
Marker Free ◽  
The Impact ◽  
Selection Of

Objectives: The original objectives of this project were to: 1) evaluate inducible promoters for the expression of recombinase in apple (USDA-ARS); 2) develop alternative selectable markers for use in apple to facilitate the positive selection of gene excision by recombinase (Cornell University); 3) compare the activity of three different recombinase systems (Cre/lox, FLP/FRT, and R/RS)in apple using a rapid transient assay (ARO); and 4) evaluate the use of recombinase systems in apple using the best promoters, selectable markers and recombinase systems identified in 1, 2 and 3 above (Collaboratively). Objective 2 was revised from the development alternative selectable markers, to the development of a marker-free selection system for apple. This change in approach was taken due to the inefficiency of the alternative markers initially evaluated in apple, phosphomannose-isomerase and 2-deoxyglucose-6-phosphate phosphatase, and the regulatory advantages of a marker-free system. Objective 3 was revised to focus primarily on the FLP/FRT recombinase system, due to the initial success obtained with this recombinase system. Based upon cooperation between researchers (see Achievements below), research to evaluate the use of the FLP recombinase system under light-inducible expression in apple was then conducted at the ARO (Objective 4). Background: Genomic research and genetic engineering have tremendous potential to enhance crop performance, improve food quality and increase farm profits. However, implementing the knowledge of genomics through genetically engineered fruit crops has many hurdles to be overcome before it can become a reality in the orchard. Among the most important hurdles are consumer concerns regarding the safety of transgenics and the impact this may have on marketing. The goal of this project was to develop plant transformation technologies to mitigate these concerns. Major achievements: Our results indicate activity of the FLP\FRTsite-specific recombination system for the first time in apple, and additionally, we show light- inducible activation of the recombinase in trees. Initial selection of apple transformation events is conducted under dark conditions, and tissue cultures are then moved to light conditions to promote marker excision and plant development. As trees are perennial and - cross-fertilization is not practical, the light-induced FLP-mediated recombination approach shown here provides an alternative to previously reported chemically induced recombinase approaches. In addition, a method was developed to transform apple without the use of herbicide or antibiotic resistance marker genes (marker free). Both light and chemically inducible promoters were developed to allow controlled gene expression in fruit crops. Implications: The research supported by this grant has demonstrated the feasibility of "marker excision" and "marker free" transformation technologies in apple. The use of these safer technologies for the genetic enhancement of apple varieties and rootstocks for various traits will serve to mitigate many of the consumer and environmental concerns facing the commercialization of these improved varieties.  

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