| pulsed-field gel electrophoresis determination of the genome size of obligate intracellular bacteria belonging to the genera chlamydia, rickettsiella, and porochlamydia. | the chromosome length of obligate intracellular procaryotes was determined by pulsed-field gel electrophoresis of intact or noti- and sfii-restricted genomes. sizes averaged 2,100, 1,720, 1,550, 2,650, and 1,450 kilobases for rickettsiella grylli, rickettsiella melolonthae, porochlamydia buthi, porochlamydia chironomi, and chlamydia psittaci and chlamydia trachomatis, respectively. an sfii restriction map of the r. melolonthae genome was derived. | 1989 | 2753864 |
| behavioral fever and therapy in a rickettsia-infected orthoptera. | gryllus bimaculatus were infected with an intracellular prokaryote, rickettsiella grylli, then reared either at fixed temperatures or in a temperature gradient (22-36 degrees c) where they could select the temperature they preferred. only 50% of the infected insects reared at 28 degrees c or less survived after 20 days, against 75% of those reared at 30 degrees c or more and 90% of those in the temperature gradient. examination of smears of insect tissue showed that all (100%) of the infected in ... | 1986 | 3755009 |
| [experimental infection of mice by an entomopathogenic rickettsia: rickettsiella grylli. infestation by the intraperitoneal route. chronic phase]. | | 1986 | 3777788 |
| [experimental infection of mice by entomopathogenic rickettsia: rickettsiella grylli. infestation by the intraperitoneal route. acute phase]. | | 1985 | 3835835 |
| [effect of invertebrate rickettsiae on vertebrates: experimental infection of mice by rickettsiella grylli]. | an analysis by cytology, electron microscopy, and serology of experimental infections of the mouse by an invertebrate rickettsia with chlamydial cycle, rickettsiella grylli, showed that, according to the routes and the severity of the infection, the pathogen can have no effect, or cause local inflammations, or induce degenerative or malignant processes. the very limited development of the pathogen as well as the possible direct role of the chlamydial elementary bodies and toxins in the pathogene ... | 1985 | 3919886 |
| [on the experimental infection of gryllus bimaculatus and g. capitatus (orthoptera) by rickettsiella grylli, rickettsiosis agent in orthoptera]. | | 1968 | 5753287 |
| taxonomic studies of rickettsiella, rickettsia, and chlamydia using genomic dna. | invertebrate pathogens of the genus rickettsiella (order rickettsiales) undergo a developmental cycle more characteristic of chlamydial organisms (order chlamydiales) than of typical rickettsiae. moreover, among recognized species of rickettsiella, there is considerable variation in host range and in the ultrastructure and development of the infectious stage, i.e., the elementary body. to begin an analysis of the taxonomic relationships of the invertebrate pathogens belonging to the genus ricket ... | 1994 | 7912708 |
| reassessment of the taxonomic position of rickettsiella grylli. | we determined the 16s rrna gene sequence of rickettsiella grylli, an intracellular parasite of gryllus bimaculatus and related species of crickets. phylogenetic inferences made from alignment of this sequence with the sequences of other bacteria demonstrated that r. grylli is most closely related to coxiella burnetii and legionella species in the gamma subclass of the phylum proteobacteria. r. grylli was previously thought to be related to members of the order rickettsiales, but the representati ... | 1997 | 9336939 |
| the specificity of behavioral fever in the cricket acheta domesticus. | when infected, some insects can raise their body temperature by moving to warmer areas. this behavioral fever response can help the host overcome infection. however, not all parasites and pathogens are equally susceptible to increases in host temperature. elevating the temperature of the cricket acheta domesticus from room temperature (22 c) to 33 c did not reduce the survival of parasitoid flies or reduce the number of gregarine gut protozoans, and crickets infested with these parasites showed ... | 1998 | 9645851 |
| application of 16s rdna-dgge to examine the microbial ecology associated with a social wasp vespula germanica. | invertebrates host numerous bacteria, with interactions ranging from pathogenesis to symbiosis. while certain symbiotic relationships have been well studied, little is known about the dynamics of these bacterial communities. denaturing gradient gel electrophoresis (dgge) was used to examine the bacterial microflora associated with the eusocial wasp vespula germanica. dgge profiles of larval guts revealed a variable microflora, suggesting that v. germanica is not dependent on a particular suite o ... | 2003 | 12542639 |
| genome analysis of coxiella burnetii species: insights into pathogenesis and evolution and implications for biodefense. | coxiella burnetii, the etiological agent of q fever, is a class b biodefense agent. we are continuing the momentum of discovery generated by the first coxiella genome sequences by extending the breadth of genomics to include four additional heterogeneous c. burnetii strains. we are also sequencing the genome of rickettsiella grylli, an intracellular parasite of grasshoppers and the closest known phylogenetic relative to the coxiella group. these data will enable the investigation of fundamental ... | 2005 | 16481558 |
| molecular characterization and evolution of arthropod-pathogenic rickettsiella bacteria. | we determined the 16s rrna gene sequences of three crustacean "rickettsiella armadillidii" strains. rickettsiella bacteria overall appear to form a monophyletic group that diverged from coxiella bacteria approximately 350 million years ago. therefore, the genus rickettsiella as a whole (not just rickettsiella grylli) should be classified among the gammaproteobacteria instead of the alphaproteobacteria. | 2007 | 17557851 |
| type iv secretion system components as phylogenetic markers of entomopathogenic bacteria of the genus rickettsiella. | the genus rickettsiella (class gammaproteobacteria; order legionellales; family coxiellaceae) comprises intracellular bacterial pathogens of a wide range of arthropods that are currently classified in the three recognized species, rickettsiella popilliae, rickettsiella grylli, and rickettsiella chironomi. rickettsiella bacteria contain a type ivb secretion system (t4ss) known to be a key virulence factor of the related genus legionella. providing the first respective sequence information for the ... | 2008 | 18179586 |
| 16s rrna-, groel- and mucz-based assessment of the taxonomic position of 'rickettsiella melolonthae' and its implications for the organization of the genus rickettsiella. | 'rickettsiella melolonthae' is an intracellularly multiplying bacterial pathogen of european cockchafers, melolontha melolontha (linnaeus, 1758) and melolontha hippocastani (fabricius, 1801) (coleoptera: scarabaeidae). we report the first determination of nucleotide sequences from this organism, i.e. the 16s rrna encoding rrs gene, the chaperonin encoding groel gene and the mucz gene encoding the orthologue of a capsule synthesis-inducing factor of coxiella burnetii. within the genus rickettsiel ... | 2008 | 18398164 |
| whole genome-based assessment of the taxonomic position of the arthropod pathogenic bacterium rickettsiella grylli. | rickettsiella grylli is an intracellular bacterial pathogen of aquatic and terrestrial arthropods. previous determination of its 16s rrna-encoding sequence has led to the taxonomic classification of the genus rickettsiella in the class gammaproteobacteria, order legionellales, family coxiellaceae, i.e. in close vicinity to vertebrate pathogenic bacteria of the genera coxiella and legionella. here we use the additional information available from the recently published first whole genome sequence ... | 2008 | 18422627 |
| type ivb secretion systems of legionella and other gram-negative bacteria. | type iv secretion systems (t4sss) play a central role in the pathogenicity of many important pathogens, including agrobacterium tumefaciens, helicobacter pylori, and legionella pneumophila. the t4sss are related to bacterial conjugation systems, and are classified into two subgroups, type iva (t4ass) and type ivb (t4bss). the t4bss, which is closely related to conjugation systems of inci plasmids, was originally found in human pathogen l. pneumophila; pathogenesis by l. pneumophila infection req ... | 2011 | 21743810 |
| multilocus sequence typing (mlst) for the infra-generic taxonomic classification of entomopathogenic rickettsiella bacteria. | the genus rickettsiella comprises intracellular bacterial pathogens of a wide range of arthropods that are currently classified in four recognized species and numerous further pathotypes. however, both the delineation of and the synonymization of pathotypes with species are highly problematic. in the sequel of a previous phylogenomic study at the supra-generic level, nine selected genes - the 16s and 23s rrna genes and the protein-encoding genes dnag, ftsy, gida, ksga, rpob, rpsa, and sucb - wer ... | 2011 | 22092813 |
| discovery of novel rickettsiella spp. in ixodid ticks from western canada. | the genomic dna from four species of ixodid ticks in western canada was tested for the presence of rickettsiella by pcr analyses targeting the 16s rrna gene. eighty-eight percent of the ixodes angustus (n = 270), 43% of the i. sculptus (n = 61), and 4% of the i. kingi (n = 93) individuals examined were pcr positive for rickettsiella, whereas there was no evidence for the presence of rickettsiella in dermacentor andersoni (n = 45). three different single-strand conformation polymorphism profiles ... | 2014 | 24334664 |
| a rickettsiella bacterium from the hard tick, ixodes woodi: molecular taxonomy combining multilocus sequence typing (mlst) with significance testing. | hard ticks (acari: ixodidae) are known to harbour intracellular bacteria from several phylogenetic groups that can develop both mutualistic and pathogenic relationships to the host. this is of particular importance for public health as tick derived bacteria can potentially be transmitted to mammals, including humans, where e.g. rickettsia or coxiella act as severe pathogens. exact molecular taxonomic identification of tick associated prokaryotes is a necessary prerequisite of the investigation o ... | 2012 | 22675436 |
| draft genome of the honey bee ectoparasitic mite, tropilaelaps mercedesae, is shaped by the parasitic life history. | the number of managed honey bee colonies has considerably decreased in many developed countries in recent years and ectoparasitic mites are considered as major threats to honey bee colonies and health. however, their general biology remains poorly understood. | 2017 | 28327890 |
| multilocus sequence analysis (mlsa) of 'rickettsiella agriotidis', an intracellular bacterial pathogen of agriotes wireworms. | wireworms, the polyphagous larvae of click beetles belonging to the genus agriotes (coleoptera: elateridae) are severe and widespread agricultural pests that affect numerous crops globally. a new bacterial specimen identified in diseased wireworms had previously been shown by microscopy and 16s ribosomal rna (rrna) gene-based phylogenetic reconstruction to belong to the taxonomic genus rickettsiella (gammaproteobacteria) that comprises intracellular bacteria associated with and typically pathoge ... | 2013 | 23007524 |