A Novel Photoelectrochemical Aptamer Sensor Based on CdTe Quantum Dots Enhancement and Exonuclease I-Assisted Signal Amplification for Listeria monocytogenes Detection

To achieve the rapid detection of Listeria monocytogenes, this study used aptamers for the original identification and built a photoelectrochemical aptamer sensor using exonuclease-assisted amplification. Tungsten trioxide (WO3) was used as a photosensitive material, was modified with gold nanoparticles to immobilize complementary DNA, and amplified the signal by means of the sensitization effect of CdTe quantum dots and the shearing effect of Exonuclease I (Exo I) to achieve high-sensitivity detection. This strategy had a detection limit of 45 CFU/mL in the concentration range of 1.3 × 101–1.3 × 107 CFU/mL. The construction strategy provides a new way to detect Listeria monocytogenes.

A full catalogue and analysis of Indian painted photographs at Royal Ontario Museum's South Asian photographic collection

This thesis is based on a photographic collection of Indian painted photographs from the South Asian Photographic collection at the Royal Ontario Museum (ROM). There are fifty-four photographic objects created by various makers and photographers with dates ranging from the 1880's to the 1990's. For the most part the objects are examples of studio portraiture. Most of them are photographic images with applied colour, however, there are some examples of paintings in this group that were executed in the tradition of photographic studio portraiture, but have no evidence of a photosensitive material underneath. The paintings, as well as the painted photographs, employ different media, such as watercolour, gouache and oil paints. The objects I investigated and catalogued fall under three categories: prints made by contact printing, by enlargement, and finally paintings produced using a photograph as a model. Tinting of photographs was a well-known Western tradition in the nineteenth century, while the process that Indian artists developed was a synthesis of their long practiced tradition of miniature painting and the newly developed technology of photography. Finally this thesis unveils the means of production of Indian painted photographs, and tries to find the reason for Indian artists employing opaque medium in their colourings.

A full catalogue and analysis of Indian painted photographs at Royal Ontario Museum's South Asian photographic collection

This thesis is based on a photographic collection of Indian painted photographs from the South Asian Photographic collection at the Royal Ontario Museum (ROM). There are fifty-four photographic objects created by various makers and photographers with dates ranging from the 1880's to the 1990's. For the most part the objects are examples of studio portraiture. Most of them are photographic images with applied colour, however, there are some examples of paintings in this group that were executed in the tradition of photographic studio portraiture, but have no evidence of a photosensitive material underneath. The paintings, as well as the painted photographs, employ different media, such as watercolour, gouache and oil paints. The objects I investigated and catalogued fall under three categories: prints made by contact printing, by enlargement, and finally paintings produced using a photograph as a model. Tinting of photographs was a well-known Western tradition in the nineteenth century, while the process that Indian artists developed was a synthesis of their long practiced tradition of miniature painting and the newly developed technology of photography. Finally this thesis unveils the means of production of Indian painted photographs, and tries to find the reason for Indian artists employing opaque medium in their colourings.

NEGATIVE PHOTORESISTS ON THE BASIS OF COPOLYMERS OF 2-CHLOROMETHYL-1-(PVINYL PHENYL)CYCLOPROPANE WITH GLYCIDYL METHACRYLATE

The radical copolymerization of 2-chloromethyl-1-(p-vinyl phenyl)cyclopropane with glycidyl methacrylate is carried out. The composition and structure of the obtained copolymer are established. The constant values of relative activity of monomers are determined and Q-е parameters on Alfrey-Price are calculated. The photosensitivity of new cyclopropane and epoxy-containing photosensitive copolymers is studied. The photochemical structuring is investigated and it is established that the synthesized polymer has a photosensitivity (56 cm2/J) and can be used for creation of photosensitive material.

Silicon-based PbSe quantum dot near-infrared photodetector with spectral selectivity

Traditional photodetectors usually respond to photons larger than the bandgap of a photosensitive material. In contrast to traditional photodetectors for broad-spectrum detection, the currently reported PbS/PMMA/PbSe CQDs silicon-based photodetectors can...