scholarly journals UV Light Effects on Proteins: From Photochemistry to Nanomedicine

10.5772/37947 ◽  
2012 ◽  
Author(s):  
Maria Teresa ◽  
Steffen Petersen ◽  
Gnana Prakash
Keyword(s):  
Uv Light ◽  
Light Effects

scholarly journals The UV light effects on pectinase production of Pantoea sp. bacteria

2020 ◽  
Vol 11 (3) ◽  
pp. 4578-4582
Author(s):  
Mohmmed Lefta Atala
Keyword(s):  
Nalidixic Acid ◽  
Specific Activity ◽  
Uv Light ◽  
Human Life ◽  
Wild Type ◽  
Bacterial Mutants ◽  
Light Effects ◽  
Physical Effects ◽  
The Common ◽  
Pectinase Production

The highest pectinase producing isolate A3 out of forty isolates of Pantoea sp. bacteria was subjected to physical effects by using UV light to change in their ability for producing of pectinase, the results appeared increasing their activity and production in some of the mutants more than wild type bacteria, the increase was ranged between 14 to 20% in specific activity between bacterial mutants compared with wild type bacteria. Also, the two highest enzyme-producing isolates were tested for their susceptibility against a group of antibiotics (Rifampin 50mcg, Imipenem 10mcg, Vancomycin 30mcg, Amoxicillin 25mcg, Chloramphenicol 30mcg, Trimethoprim 5mcg, Nitrofurantoin 100mcg, Nalidixic acid 30mcg), results appeared different susceptibilities ranged between resist for amoxicillin,and Nalidixic acid, and sensitive for other antibiotics. The susceptibilities of studied bacteria to some antibiotics were different between resist and sensitive, which considered an indicator of dangerous to human life. The study was aimed to increase the ability of these isolate in producing this enzyme which plays an essential role in different industries in food, cosmetics manufacturing and scientific research, besides, their ability in resisting some of the common antibiotics to confirm the transferring of genetic materials between bacteria that isolated from soil samples, which is considered crucial in the microbial genetics. The study appeared there were apparent effects on the genes that responsible for enzyme production either for increase or decrease their activity and creation of an enzyme, which belong to using physical effects to improvement these feature in bacteria.

scholarly journals Ultraviolet Light Effects on Cobalt–Thiourea Complexes Crystallization

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 473
Author(s):  
Luis Eduardo Trujillo Villanueva ◽  
Felipe Legorreta García ◽  
Fidel Pérez Moreno ◽  
Marius Ramírez Cardona ◽  
Edgar Arturo Chávez Urbiola
Keyword(s):  
Ultraviolet Light ◽  
Structural Modification ◽  
Uv Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
Evaporation Technique ◽  
Light Effects ◽  
Crystal Synthesis ◽  
Crystalline Forms ◽  
Shape Changes

In this work, a cobalt–thiourea complexes crystal synthesis was carried out comparatively with and without ultraviolet light assistance (λ = 253 nm), and its effect was studied. Through the solvent evaporation technique, crystalline forms were obtained, which were analyzed and characterized by different techniques: Raman spectroscopy, X-ray diffraction (XRD), and digital optical microscopy. Crystal’s shape changes were observed when comparing those obtained from the solution with and without ultraviolet (UV) assistance. It was found that the UV light effect on the crystals causes a structural modification of the complex synthesized in the (022) (120) planes and without UV assistance in the (002), (111), (131¯), and (132¯) planes. It is also possible to observe an increase in intensity by Raman spectra identified as Co–S bonds (297 cm−1) for crystals synthesized with UV assistance.

scholarly journals UV-Light Effects on Cytochrome C Modulated by the Aggregation State of Phenothiazines

PLoS ONE ◽  
2013 ◽  
Vol 8 (10) ◽  
pp. e76857 ◽  
Author(s):  
Carolina G. dos Santos ◽  
André L. Silva ◽  
Flavio L. Souza ◽  
Alexandre J. C. Lanfredi ◽  
Paolo Di Mascio ◽  
...  
Keyword(s):  
Cytochrome C ◽  
Uv Light ◽  
Aggregation State ◽  
Light Effects

Electron microscopy of keratinocytes cultured on a collagen substrate used as an allograft for the treatment of chronic wounds

1992 ◽  
Vol 50 (2) ◽  
pp. 1104-1105
Author(s):  
Debby A. Jennings ◽  
Michael J. Morykwas ◽  
Louis C. Argenta
Keyword(s):  
Electron Microscopy ◽  
Cell Suspension ◽  
Single Cell ◽  
Chronic Wounds ◽  
Mechanical Stability ◽  
Uv Light ◽  
Type I ◽  
Single Cell Suspension ◽  
Collagen Substrate ◽  
Dermal Collagen

Grafts of cultured allogenic or autogenic keratlnocytes have proven to be an effective treatment of chronic wounds and burns. This study utilized a collagen substrate for keratinocyte and fibroblast attachment. The substrate provided mechanical stability and augmented graft manipulation onto the wound bed. Graft integrity was confirmed by light and transmission electron microscopy.Bovine Type I dermal collagen sheets (100 μm thick) were crosslinked with 254 nm UV light (13.5 Joules/cm2) to improve mechanical properties and reduce degradation. A single cell suspension of third passage neonatal foreskin fibroblasts were plated onto the collagen. Five days later, a single cell suspension of first passage neonatal foreskin keratinocytes were plated on the opposite side of the collagen. The grafts were cultured for one month.The grafts were fixed in phosphate buffered 4% formaldehyde/1% glutaraldehyde for 24 hours. Graft pieces were then washed in 0.13 M phosphate buffer, post-fixed in 1% osmium tetroxide, dehydrated, and embedded in Polybed 812.

A photoelectron microscope study of surfaces

1989 ◽  
Vol 47 ◽  
pp. 10-11
Author(s):  
W. Engel ◽  
M. Kordesch ◽  
A. M. Bradshaw ◽  
E. Zeitler
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Field Strength ◽  
Uv Light ◽  
Physical Property ◽  
Photon Flux ◽  
Mercury Lamp ◽  
Object Surface ◽  
The Sixties ◽  
Physical Features

Photoelectron microscopy is as old as electron microscopy itself. Electrons liberated from the object surface by photons are utilized to form an image that is a map of the object's emissivity. This physical property is a function of many parameters, some depending on the physical features of the objects and others on the conditions of the instrument rendering the image.The electron-optical situation is tricky, since the lateral resolution increases with the electric field strength at the object's surface. This, in turn, leads to small distances between the electrodes, restricting the photon flux that should be high for the sake of resolution.The electron-optical development came to fruition in the sixties. Figure 1a shows a typical photoelectron image of a polycrystalline tantalum sample irradiated by the UV light of a high-pressure mercury lamp.

Immunolabelling of glomerular deposits in kidney biopsies routinely fixed in glutaraldehyde

1989 ◽  
Vol 47 ◽  
pp. 910-911
Author(s):  
Ś Lhoták ◽  
I. Alexopoulou ◽  
G. T. Simon
Keyword(s):  
Uv Light ◽  
Kidney Diseases ◽  
Light Chains ◽  
Microscopical Level ◽  
Accurate Identification ◽  
Light Microscopical Level ◽  
Dense Deposits ◽  
Cacodylate Buffer ◽  
Glomerular Deposits ◽  
Prognostic Importance

Various kidney diseases are characterized by the presence of dense deposits in the glomeruli. The type(s) of immunoglobulins (Igs) present in the dense deposits are characteristic of the disease. The accurate Identification of the deposits is therefore of utmost diagnostic and prognostic importance. Immunofluorescence (IF) used routinely at the light microscopical level is unable to detect and characterize small deposits found in early stages of glomerulonephritis. Although conventional TEM is able to localize such deposits, it is not capable of determining their nature. It was therefore attempted to immunolabel at EM level IgG, IgA IgM, C3, fibrinogen and kappa and lambda Ig light chains commonly found in glomerular deposits on routinely fixed ( 2% glutaraldehyde (GA) in 0.1M cacodylate buffer) kidney biopsies.The unosmicated tissue was embedded in LR White resin polymerized by UV light at -10°C. A postembedding immunogold technique was employed

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