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At least 1,225 records · Page 68Linked to original sources
PubMed1996

The movement proteins of cowpea mosaic virus and cauliflower mosaic virus induce tubular structures in plant and insect cells.

The movement proteins (MP) of cowpea mosaic virus and cauliflower mosaic virus (CaMV) are associated with tubular structures in vivo which participate in the transmission of virus particles from cell to cell. Both proteins have been expressed in plant protoplasts and insect cells. In all cases, immunofluorescent histochemistry showed that the MPs accumulate intracellularly as tubular extensions projecting from the cell surface. Additionally, electron microscopy revealed intracellular MP aggregates in CaMV MP-expressing cells. The data presented establish common features for the tubule-forming MPs: no other virus gene products are required for tubule formation and unique plant components (e.g. plasmodesmata) are not essential for tubule synthesis.

Animals↗
PubMed2005

Detection of multiple viruses in queens of the honey bee Apis mellifera L.

Individual honey bee Apis mellifera L. queens were examined for the presence of six honey bee viruses including acute bee paralysis virus, chronic bee paralysis virus, black queen cell virus, deformed wing virus, Kashmir bee virus, and sacbrood virus. All viruses, except ABPV, were detected in the samples. Among queens examined for virus infections, 93% had multiple virus infections. The detection of viruses in queens raises the possibility of a vertical transmission pathway wherein infected queens can pass virus through their eggs to their offspring.

Animals↗
PubMed1977

Characterization of the Drosophila C virus.

Some properties of Drosophila C virus (DCV), a non-occluded isometric virus, have been studied. The virus particles were 30 nm in diam., their sedimentation coefficient was 153S and their buoyant density was 1-34 g/ml in caesium chloride in the pH range 7 to 9. These particles contained about 31% ribonucleic acid (RNA) and 69% protein. The reaction of formaldehyde with DCV particles suggested that the RNA in situ is single-stranded. The infectivity of DCV was stable at pH 3. The virus capsid contained three major polypeptides with mol. wt. of 31000, 30000 and 28000, and two minor components of mol. wt. 37000 and 8500. Virus preparations also contained a small number of infective particles 24 nm in diam. banding at a density of 1-44 g/ml. Preliminary results indicated that these heavy particles probably correspond to the dense particles recently reported in several vertebrate picornaviruses. RNA extracted from DCV was single-stranded and infectious. Its mol. wt. was calculated to be approx 3 X 10(6). It is proposed that this virus be included in the enterovirus group. The crytogram of the virus is R/1:3.0/31:S/S:I/O.

Animals↗
PubMed1988

Drosophila S virus, a hereditary reolike virus, probable agent of the morphological S character in Drosophila simulans.

Isometric reolike virions were found in all the examined Drosophila simulans flies from two strains (SimES-st and Israel-st) presenting the S phenotype, a maternally inherited morphological trait (abnormalities of bristles). Normal flies of both strains appeared virus-free. Virions were found in the cytoplasm of male and female gonads and epidermal cells, including the bristle-forming cells, which appeared disorganized. Steps of virogenesis were described. A positive correlation was demonstrated between expressivity of the S phenotype and degree of viral infection. This hereditary reolike virus seems to be responsible for the S character of D. simulans and was named DSV (Drosophila S virus).

Animals↗