Morphological Structure of Rickettsiae
نویسندگان
چکیده
The morphological structures of the rickettsiae of epidemic and endemic typhus fever, Rocky Mountain spotted fever, and Q fever are similar to one another and to certain bacteria. The rickettsial organisms in common with the elementary bodies of vaccinia virus and all bacteria would appear to have a limiting membrane which surrounds a substance that seems to be protoplasmic in nature; numbers of dense granules are embedded in the inner protoplasm.
منابع مشابه
Morphological and molecular identification of the brown dog tick Rhipicephalus sanguineus and the camel tick Hyalomma dromedarii (Acari: Ixodidae) vectors of Rickettsioses in Egypt
AIM Rickettsioses have an epidemiological importance that includes pathogens, vectors, and hosts. The dog tick Rhipicephalus sanguineus and the camel tick Hyalomma dromedarii play important roles as vectors and reservoirs of Rickettsiae. The aim of this study was to determine the prevalence of Rickettsiae in ixodid ticks species infesting dogs and camels in Egypt, in addition to, the morphologi...
متن کاملMorphological, chemical, and serological studies of the cell walls of Rickettsia mooseri.
A membrane surrounding the protoplasm of rickettsiae has been demonstrated electronmicroscopically by Plotz et al. (1943) and Wissig et al. (1956) in air dried preparations, and by Stoker et al. (1956) and Tousimis (1956) in ultrathin sections. This limiting membrane may be considered to represent the cell wall of these organisms and to correspond to the analogous structure of bacteria. Extensi...
متن کاملUltrastructural study of the response of cells infected in vitro with causative agent of spotted fever group rickettsiosis in Japan.
The response of host cells L929 infected with causative agent of spotted fever group (SFG) rickettsiosis in Japan, the Katayama strain, was studied by electron microscopy. The rickettsiae penetrated the cytoplasm and multiplied here and after prolonged incubation progressed into the dilated cisternae of rough endoplasmic reticulum (rER), the perinuclear space, the deep invaginated nuclear membr...
متن کاملComparison of different media for preservation and transport of viable rickettsiae.
Rickettsiae tend to have a rapid decrease of viability outside living cells. Therefore, the transport of samples containing viable rickettsiae for culturing in cell culture for diagnostic purposes is challenging. The viability of rickettsiae in different transport media (commercially available transport medium COPAN "UTM-RT transport medium for viruses, chlamydia, mycoplasma, and ureaplasma," m...
متن کاملThe Cytology of Rickettsiae
Internal structures of rickettsiae seen with phase contrast microscopy and in the electron microscope contain desoxyribonucleic acid and are therefore nuclear structures similar to those found in bacteria. They are minute spherical bodies, either single as in spherical rickettsiae or varying in number from 2 to 4 in rod-shaped forms. Occasional dumbbell-shaped chromatinic bodies are thought to ...
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ورودعنوان ژورنال:
- The Journal of Experimental Medicine
دوره 77 شماره
صفحات -
تاریخ انتشار 1943