The cost reduction of DNA sequencing by massive sequence parallel

The cost reduction of DNA sequencing by massive sequence parallelization, is democratizing the knowledge of genomic information of different organisms (e.g. economically important like Vitis vinifera [68]) and opening the door to functional genomics studies by DNA microarrays to any organism or biological condition.Table 1.Types of oligonucleotide and cDNA microarrays.Different companies have developed different strategies to produce their DNA microarray using phosphoramidite chemistry and reactive protective groups in the last added nucleotide of the growing DNA oligonucleotide. Protective groups prevent unwanted side reactions and force the formation of the desired oligonucleotide sequence during synthesis. Affymetrix, Nimblegen (Roche) and Febit platforms use the light to activate particular chip sites but extend the oligonucleotide length with photolithography masks in the first case [5], or micromirrors in the second and third cases [69�C71]. The Agilent technology uses ink-jet technology to spot the amidites and employs a flooded chemical deprotection [72] while CombiMatrix uses an addressable electrode array for the production of acid at sufficient concentration to allow deprotection process and to permit the oligonucleotide synthesis [73]. Nanogen, a company that has been on the market since 1997, developed a microelectronic array used to influence DNA transport, concentration and hybridization changing physical parameters like DC current, voltage, solution conductivity and buffer species (APEX technology) [74] (Table 1). Illumina and Motorola have developed novel 3D microarrays. Illumina combines the association of microbeads linked to specific probes and an array of microwells that could accommodate one bead per well, allowing
Near-infrared spectroscopy [1�C3] is widely used for chemical analysis, food safety and quality monitoring, materials inspection and the monitoring of dynamic process, etc. Most established and classical methods in this field can be grouped into two classes: (1) Dispersive methods, including scanned-grating monochromators or optical multichannel analyzers (OMA) typically using a detector array. (2) Nondispersive methods, including arrays or sequences of fixed filters, or Fourier Transform spectroscopy (FTIR). Each of these techniques provides different combinations of resolution, speed, sensitivity and cost.Micro-opto-electromechanical systems (MOEMS) technology has experienced a rapid U0126 IC50 progress in recent decades. A near-infrared spectrometer based on this technology with many advantages such as cost effectiveness, portability, low power consumption, high speed, and miniaturization has become one of the most interesting research topics in the near-infrared spectroscopy field.

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