the morphology of the adults, egg, larva and pupa of anopheles persiensis linton, sedaghat & harbach, an iranian member of the holarctic maculipennis group, was studied and compared with the morphology of the closely related and sympatric a. maculipennis meigen. anopheles persiensis was formally recognized based on dna evidence and egg morphology. the fourth member of the group, anopheles persi...

synthesis, identification and thermal behavior studies of nanoparticles cobalt (ii) bromide has been studied in this research. cobalt (ii) bromide was synthesized by planetary high-energy ball mill. the general formula of this compound is cobr2.6h2o. the synthesized nanoparticles were characterized by fourier transform infrared spectroscopy and also size and structure of synthesized nanoparticl...

Progress has been made in the development of four-dimensional ultrafast electron microscopy, which enables space-time imaging of structural dynamics in the condensed phase. In ultrafast electron microscopy, the electrons are accelerated, typically to 200 keV, and the microscope operates in the transmission mode. Here, we report the development of scanning ultrafast electron microscopy using a f...

Leaf stomatal characteristics of Siberian elm (Ulmus pumila) were investigated by electron microscopy and white light scanning interferometry. On the basis of average annual precipitations, two types of tree specimens were collected from Korea, China, and Mongolia: (1) trees under normal environmental conditions and (2) trees under arid conditions. Field emission scanning electron microscopy re...

Microorganisms, including bacteria, fungi, protozoa, and microalgae, are composed predominantly of water which prohibits direct observation in a traditional scanning electron microscope (SEM). Preparation for SEM requires that microorganisms be fixed, frozen or dehydrated, and coated with a conductive film before observation in a high vacuum environment. Sample preparation may mechanically dist...

Electron microscopy of materials in a gaseous environment has its origins as far back as about the 1950s for the transmission electron microscope (TEM), later followed by developments for the scanning electron microscope (SEM). Focusing on the latter, this review outlines the history and commercial development of the technology, culminating in the environmental SEM (ESEM), and the techniques fo...