ABSTRACT
A new huanglongbing (HLB) “
Candidatus
Liberibacter” species is genetically characterized, and the bacterium is designated “
Candidatus
Liberibacter psyllaurous.” This bacterium infects the psyllid
Bactericera cockerelli
and its solanaceous host plants potato and tomato, potentially resulting in “psyllid yellowing.” Host plant-dependent HLB transmission and variation in psyllid infection frequencies are found.
Feline haemoplasma infection can cause haemolytic anaemia. The natural method of transmission of haemoplasmas between cats is currently unknown but the nature of some of the risk factors for infection suggests that saliva may act as a mode of transmission. The aim of this study was to determine if Mycoplasma haemofelis (Mhf) and ‘ Candidatus Mycoplasma haemominutum’ (CMhm) DNAs could be amplified from saliva and salivary gland samples collected from haemoplasma-infected cats.
ABSTRACT
Triple-agent therapy with lansoprazole (15 mg/kg)-clarithromycin (50 mg/kg)-amoxicillin (50 mg/kg) twice daily for 7 days fully cleared “
Candidatus
Helicobacter heilmannii” from infected mouse stomachs. Moreover, gastric mucosa-associated lymphoid tissue lymphoma-like lesions in the stomach nearly disappeared in the treated mice 4 months after the therapy.
ABSTRACT
Buchnera aphidicola
BCc, the primary endosymbiont of the aphid
Cinara cedri
(subfamily Lachninae), is losing its symbiotic capacity and might be replaced by the coresident “
Candidatus
Serratia symbiotica.” Phylogenetic and morphological analyses within the subfamily Lachninae indicate two different “
Ca
. Serratia symbiotica” lineages and support the longtime coevolution of both symbionts in
C. cedri
.
ABSTRACT
“
Candidatus
Pelagibacter ubique,” an abundant marine alphaproteobacterium, subsists in nature at low ambient nutrient concentrations and may often be exposed to nutrient limitation, but its genome reveals no evidence of global regulatory mechanisms for adaptation to stationary phase. High-resolution capillary liquid chromatography coupled online to an LTQ mass spectrometer was used to build an accurate mass and time (AMT) tag library that enabled quantitative examination of proteomic differences between exponential- and stationary-phase “
Ca
. Pelagibacter ubique” cells cultivated in a seawater medium. The AMT tag library represented 65% of the predicted protein-encoding genes. “
Ca
. Pelagibacter ubique” appears to respond adaptively to stationary phase by increasing the abundance of a suite of proteins that contribute to homeostasis rather than undergoing a major remodeling of its proteome. Stationary-phase abundances increased significantly for OsmC and thioredoxin reductase, which may mitigate oxidative damage in “
Ca
. Pelagibacter,” as well as for molecular chaperones, enzymes involved in methionine and cysteine biosynthesis, proteins involved in ρ-dependent transcription termination, and the signal transduction enzyme CheY-FisH. We speculate that this limited response may enable “
Ca
. Pelagibacter ubique” to cope with ambient conditions that deprive it of nutrients for short periods and, furthermore, that the ability to resume growth overrides the need for a more comprehensive global stationary-phase response to create a capacity for long-term survival.