Recently, the applications of transmission electron microscopy (TEM) related techniques have extended from ex situ nanoscale characterization of structure and chemistry of products to dynamic measurements of nanostructures during reaction processes. Commercially available modified TEM specimen holders and TEM columns are being routinely employed to follow the structural and chemical changes at ...

For easy performance of Lorentz microscopy with simultaneous electric measurements, a special specimen holder for transmission electron microscopy (TEM) has been developed that has electromagnets to generate magnetic field and four leads for electric measurements. This TEM holder was evaluated by checking experimental results of permalloy (Ni0.8Fe0.2) patterns. Clear observations of domain wall...

in this study silver/poly vinyl alcohol (pva) and silver/poly vinyl pyrrolidone (pvp) nanocomposites were prepared via reduction of silver salt by employing dmf (n, n`- dimethyl formamide) as a reducing agent. effects of protective agents such as pva and pvp were also described here. we show that the acidic ph of pvp solution also affects the interaction between protective agents and silver nan...

gold nanoparticles were synthesized by chemical reduction of haucl4 inside the pores of a polycarbonate-based membrane followed by dissolving the membrane in dichloromethane and further sonication. sonication time as the main affecting factor on the nanoparticle size was investigated. the characterization by transmission electron microscopy showed the formation of gold nanoparticles with diamet...

objective(s) different types of extended spectrum beta-lactamases (esbls) are encountered in the clinical settings worldwide. there are a few studies regarding the prevalence of esbl genes among klebsiella pneumoniae isolates at tehran especially those of blaper and blactx. the aim of this study was to determine the prevalence of blashv, blatem ,blaper and blactx genes among clinical k. pneumon...

Amoxicillin-clavulanate resistance (MIC >16 microg/ml) and the corresponding molecular mechanisms were prospectively studied in Escherichia coli over a 3-year period (1996 to 1998) in 14 French hospitals. The overall frequency of resistant E. coli isolates remained stable at about 5% over this period. The highest frequency of resistant isolates (10 to 15%) was observed, independently of the yea...

INTRODUCTION The use of transanal endoscopic microsurgery (TEM) is increasing due to the ability to perform minimally invasive local treatment with large full-thickness local excision under improved vision. AIM To evaluate the initial experience with TEM for early rectal cancer in a single center. MATERIAL AND METHODS From February 2010 to November 2013 a total of 20 patients underwent TEM ...

Imaging the phase of the transmission function has always been the ultimate goal of any (S)TEM imaging technique as it is, for thin samples, directly proportional to the projected potential in the sample. Customarily this information is obtained using Holography [1] or by performing focus series reconstruction in TEM (FSR-TEM) [2], recently also in combination with Phase Plates (PP) [3] and/or ...