Biological Applications of X-Ray Contact Microscopy

State-of-the-art techniques for analysing X-ray absorption spectra are reviewed, with an eye to biological applications. Recent attempts to perform full spectral fitting of the XANES energy region and beyond for the purpose of structural analysis have met with encouraging success. The present paper analyses the theoretical motivations behind this success and indicates routes for future improvements. The theoretical background is not entirely new, although the point of view is, and some sections and appendices present material that the authors believe has never been published before. The aim of this paper is to provide a theoretical analysis that is as self-contained as possible.

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Compact soft X-ray source for biological applications

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) ◽

10.1109/nssmic.2003.1352155 ◽

2003 ◽

Author(s):

A. Yamaguchi ◽

N. Kobayashi ◽

N. Aoki ◽

Y. Motoi ◽

Y. Mitsunaka

Keyword(s):

Biological Applications ◽

X Ray

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Expanding the Family of Tetrahalide Iron Complexes: Synthesis, Structure and Biological Applications.

10.26434/chemrxiv.11864934.v2 ◽

2020 ◽

Author(s):

Nusrat Abedin ◽

Abdullah Hamed A Alshehri ◽

Ali M A Almughrbi ◽

Olivia Moore ◽

Sheikh Alyza ◽

...

Keyword(s):

Antimicrobial Properties ◽

Biological Properties ◽

Biological Applications ◽

X Ray ◽

Mononuclear Iron ◽

X Ray Crystallography ◽

Gram Positive Bacteria ◽

Axial Ligands ◽

The Family ◽

Resistant Strains

A neutral octahedral mononuclear iron(II) tetrabromide complex, [Fe(Hampy)<sub>2</sub>Br<sub>4</sub>], that consists of equatorial bromide and protonated aminopyrazinium axial ligands is successfully synthesised through redox chemistry and analysed using X-ray crystallography. The iron(II) oxidation state is balanced by the protonated pyrazinium nitrogen just outside the coordination sphere. The biological properties of this and two other related complexes are investigated using both Gram-negative and Gram-positive bacteria as well as methicillin resistant strains. They all exhibit some antimicrobial properties albeit at moderate to poor concentrations. However, the tetrahalide complexes analysed exhibit excellent anti biofilm properties well below cytotoxic levels.

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Influence of Bio-Inspired Ag doped MoO3 Nanoparticles in the Seedling Growth and Inhibitory Action Against Microbial Organisms

10.21203/rs.3.rs-571730/v1 ◽

2021 ◽

Author(s):

A. Nirmal Paul Raj ◽

R. Biju Bennie ◽

G. Alex Immanuel Xavier ◽

C Joel ◽

D. Abiya Chelliah ◽

...

Keyword(s):

Inhibitory Action ◽

Finger Millet ◽

Dopant Concentration ◽

Average Crystallite Size ◽

Spectral Studies ◽

Biological Applications ◽

Bacterial Strains ◽

X Ray Diffraction ◽

X Ray ◽

Edax Analysis

Abstract Herein we report the hydrothermal synthesis, characterization and biological applications of h-MoO3 and silver doped MoO3 nanoparticles (NPs). The phase formation of the synthesized NPs was identified using X-ray diffraction studies and vibrational spectral studies. The average crystallite size of the NPs tends to decrease as the dopant concentration increases. The surface morphology and the elemental composition of the nanoparticles were observed from SEM and EDAX analysis. The crystallite nature was obtained from HRTEM images. The band gap energies obtained from UV-DRS spectra for h-MoO3 (3.26 eV) were starting to decrease as the concentration of the dopant Ag increases (3.22-2.76eV). The antibacterial activity of the prepared nanoparticles was tested against some gram positive and gram negative bacterial strains viz., Staphylococcus aureus, Bacillus cereus and Citrobacter koseri and Pseudomonas aeruginosa respectively. Also their seed germination properties were studied on foxtail and finger millet seeds for a period of seven days.

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Evaluation of X‐ray tomography contrast agents: A review of production, protocols, and biological applications

Microscopy Research and Technique ◽

10.1002/jemt.23225 ◽

2019 ◽

Vol 82 (6) ◽

pp. 812-848 ◽

Cited By ~ 8

Author(s):

Mümin Mehmet Koç ◽

Naim Aslan ◽

Alexander P. Kao ◽

Asa H. Barber

Keyword(s):

Contrast Agents ◽

Biological Applications ◽

X Ray

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An X-Ray Projection Microscope Stage for the Cambridge S.180 S.E.M. and its Biological Applications

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s1431927600006826 ◽

1980 ◽

Vol 38 ◽

pp. 80-81

Author(s):

S. Fletcher ◽

R. S. Hannah ◽

M. J. Hollenberg

Keyword(s):

Primary Electron ◽

X Rays ◽

Biological Applications ◽

Camera Lucida ◽

X Ray ◽

3 Dimensional ◽

Suitable Target ◽

Ray Projection ◽

Point Projection ◽

Microscope Stage

The purpose of this study was to develop a functional microscope system to overcome the inherent disadvantages of using the light microscope/camera lucida system to reconstruct sections of biological material. The problem is perhaps most acute in the nervous system, where reconstruction of 3-dimensional neurons or the tracing of neuronal pathways over extensive distances must be attempted. The camera lucida system suffers from many inaccuracies and is an extremely time-consuming and tedious procedure. Point projection x-ray microscopy in the SEM, entails utilizing the primary electron beam in the spot mode to generate a point source of x-rays from a suitable target (Al, Cu, Au). This technique was first successfully demonstrated by Horn and Waltinger (1978).

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