Biosynthesis of silver nanoparticles using Westiellopsis sp. (A15), a filamentous cyanobacterium belonging to the family Fischerellaceae, has been demonstrated. Aqueous silver ions (Ag(+)) when exposed to the culture filtrate of Westiellopsis were reduced in the solution, which were characterized by biophysical measures utilizing the UV-Vis spectroscopy, scanning electron microscopy (SEM), and ...

We have shown that a scanning transmission electron microscope with a high brightness field emission source is capable of obtaining better than 3 A resolution using 30 to 40 keV electrons. Elastic dark field images of single atoms of uranium and mercury are shown which demonstrate this fact as determined by a modified Rayleigh criterion. Point-to-point micrograph resolution between 2.5 and 3.0 ...

The harmful effect of electromagnetic radiations emitted from VDU (video display unit) on red blood cells of Swiss albino mice, 20 cm away, at power density of 0.295 w/cm was investigated, at the interval of 7, 14, 28, 42 and 56days. The result showed altered blood smear, morphology and scanning electron micrograph of RBCs. red blood cell count, hemoglobin concentration was reduced up to day 4...

from the anterior spinneret of a Spiny back spider (Castercantha sp.). The spider has been stimulated to secrete silk from its piriform gland spigots (orange and yellow). In the Spiny back spider, the orientation of the spigots is critical to the organization of the narrow-gauge secreted strands that are fused together to form the final silk strand. The scanning electron micrograph has been col...

Present work aims to investigate effect of 100 MeV oxygen ion irradiation on the vibrational modes of zinc ferrite nanoparticles. Nanosize zinc ferrite systems of different crystallite size ranging from 12-62 nm were irradiated at the fluence of 1×10(13) and 5×10(13) ions/cm(2). High resolution transmission electron micrograph study indicates the structural disorder induced by ion irradiation. ...

the nanomaterials have important application in different field of science such as biology and pharmacology, which draws the attention of biologists towards this field of study more than before. as the worldwide mortality rate is high due to the pathogens and especially because of the bacteria associated aeromonas and the antibacterial effect of metal nanoparticles is well known for centuries, ...

Lin Tao and Sylvia I. Pavlova Department of Oral Biology, College of Dentisoy, University of Illinois at Chicago, Chicago, IL Normally, lactobacilli are a dominant species in the vagina and play an important role in maintaining vaginal health by producing hydrogen peroxide and lactic acid to inhibit other bacteria, such as pathogenic anaerobes. When bacterial vaginosis occurs, however, vaginal ...

Abstract: Nanocrystalline MgAl2O4 spinel powder was synthesized using metal nitrates and a polymer matrix-based composed of sucrose and polyvinyl alcohol (PVA). The precursor and the calcined powders were characterized by simultaneous thermal analysis (STA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). According to XRD res...

BERNSTEIN, M. E. H. M. HOWARD. and G. C. CARROLL. 1973. Fluorescence microscopy of Douglas fir foliage epifloia. Can. J. Microbiol. 19: 1129-1130. Douglas fir needles stained with the fluorescent dye, primulin, were observed microscopically using epiillumination with a mercury arc light source. Microorganisms fell into three categories: algae, which exhibited primary fluorescence; actinomycetes...