Host regulation and release of parasitism-specific proteins in the system Toxoneuron nigriceps–Heliothis virescens

2005 ◽  
Vol 142 (2) ◽  
pp. 181-191 ◽  
Author(s):  
F.L. Cônsoli ◽  
S.L. Brandt ◽  
T.A. Coudron ◽  
S.B. Vinson
Keyword(s):  
Heliothis Virescens ◽  
Specific Proteins ◽  
Toxoneuron Nigriceps ◽  
Host Regulation

Juvenile hormone synthesis, metabolism, and resulting haemolymph titre in Heliothis virescens larvae parasitized by Toxoneuron nigriceps

2003 ◽  
Vol 49 (11) ◽  
pp. 1021-1030 ◽  
Author(s):  
Sheng Li ◽  
Patrizia Falabella ◽  
Indira Kuriachan ◽  
S.Bradleigh Vinson ◽  
David W Borst ◽  
...  
Keyword(s):  
Juvenile Hormone ◽  
Heliothis Virescens ◽  
Hormone Synthesis ◽  
Toxoneuron Nigriceps

Toxoneuron nigriceps parasitization delays midgut replacement in fifth-instar Heliothis virescens larvae

2008 ◽  
Vol 332 (2) ◽  
pp. 371-379 ◽  
Author(s):  
Gianluca Tettamanti ◽  
Annalisa Grimaldi ◽  
Francesco Pennacchio ◽  
Magda de Eguileor
Keyword(s):  
Heliothis Virescens ◽  
Toxoneuron Nigriceps

Comparison of Searching Behavior of Parasitoid, Toxoneuron nigriceps Vierick, for Three Tobacco Herbivores

2006 ◽  
Vol 41 (4) ◽  
pp. 321-328 ◽  
Author(s):  
P. Glynn Tillman
Keyword(s):  
Heliothis Virescens ◽  
Plant Volatiles ◽  
Helicoverpa Zea ◽  
Searching Behavior ◽  
Host Searching ◽  
Suitable Host ◽  
Induced Plant Volatiles ◽  
Herbivore Induced Plant Volatiles ◽  
Toxoneuron Nigriceps ◽  
Lepidoptera Noctuidae

Host searching behavior of females of the endoparasitoid Toxoneuron nigriceps Vierick (Hymenoptera: Braconidae) was observed in the field for three tobacco herbivores, Heliothis virescens (F.), Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), and Manduca sexta L. (Lepidoptera: Sphingidae). The only developmentally suitable host for the parasitoid was H. virescens. Hovering, searching, and oviposition (for plants with herbivores) by T. nigriceps were observed for a combination of two plant types, plants with only herbivore-induced plant volatiles or damaged plants with herbivores, and three insect species. The six treatments were as follows: (1) plants with only H. virescens-induced plant volatiles, (2) plants with only H. zea-induced plant volatiles, (3) plants with only M. sexta-induced plant volatiles, (4) plants damaged by H. virescens, (5) plants damaged by H. zea, and (6) plants damaged by M. sexta. Parasitoid females readily hovered around and searched on plants of both types. However, females spent more time foraging for H. virescens than for the nonhosts, H. zea and M. sexta. For plants with only herbivore-induced plant volatiles, T. nigriceps females spent more time searching on H. virescens plants than on H. zea and M. sexta plants. For damaged plants, parasitoid females visited more H. virescens plants than M. sexta plants and spent more time searching for H. virescens larvae than for M. sexta and H. zea larvae. Even though T. nigriceps females laid eggs in M. sexta and H. zea larvae, oviposition was higher for H. virescens than for the nonhosts. In conclusion, T. nigriceps females utilized more of their energy searching for and parasitizing H. virescens over the nonhosts on tobacco.

scholarly journals Post-Egression Host Tissue Feeding is Another Strategy of Host Regulation by the Koinobiont Wasp,Toxoneuron nigriceps

2011 ◽  
Vol 11 (3) ◽  
pp. 1-11 ◽  
Author(s):  
Indira Kuriachan ◽  
Ruth Henderson ◽  
Rachel Laca ◽  
S. Bradleigh Vinson
Keyword(s):  
Host Tissue ◽  
Toxoneuron Nigriceps ◽  
Host Regulation

Changes Occur in Plasma Membrane Turnover when K562 Leukemia Cells are Induced to Differentiate

1982 ◽  
Vol 40 ◽  
pp. 286-287
Author(s):  
L. M. Marshall
Keyword(s):  
Plasma Membrane ◽  
Membrane Proteins ◽  
Intracellular Transport ◽  
Parent Cell ◽  
Membrane Turnover ◽  
Coated Pits ◽  
Surface Distribution ◽  
Specific Proteins ◽  
Erythroleukemic Cell ◽  
Specific Membrane

A human erythroleukemic cell line, metabolically blocked in a late stage of erythropoiesis, becomes capable of differentiation along the normal pathway when grown in the presence of hemin. This process is characterized by hemoglobin synthesis followed by rearrangement of the plasma membrane proteins and culminates in asymmetrical cytokinesis in the absence of nuclear division. A reticulocyte-like cell buds from the nucleus-containing parent cell after erythrocyte specific membrane proteins have been sequestered into its membrane. In this process the parent cell faces two obstacles. First, to organize its erythrocyte specific proteins at one pole of the cell for inclusion in the reticulocyte; second, to reduce or abolish membrane protein turnover since hemoglobin is virtually the only protein being synthesized at this stage. A means of achieving redistribution and cessation of turnover could involve movement of membrane proteins by a directional lipid flow. Generation of a lipid flow towards one pole and accumulation of erythrocyte-specific membrane proteins could be achieved by clathrin coated pits which are implicated in membrane endocytosis, intracellular transport and turnover. In non-differentiating cells, membrane proteins are turned over and are random in surface distribution. If, however, the erythrocyte specific proteins in differentiating cells were excluded from endocytosing coated pits, not only would their turnover cease, but they would also tend to drift towards and collect at the site of endocytosis. This hypothesis requires that different protein species are endocytosed by the coated vesicles in non-differentiating than by differentiating cells.

Analysis of 3-d molecular distribution with the digital imaging microscope

1988 ◽  
Vol 46 ◽  
pp. 40-41
Author(s):  
W.A. Carrington ◽  
F.S. Fay ◽  
K.E. Fogarty ◽  
L. Lifshitz
Keyword(s):  
Image Restoration ◽  
Digital Imaging ◽  
Fluorescent Dyes ◽  
Optical Axis ◽  
Computer Hardware ◽  
Computer Algorithms ◽  
Low Contrast ◽  
Specific Proteins ◽  
Effective Use ◽  
Single Living Cells

Advances in digital imaging microscopy and in the synthesis of fluorescent dyes allow the determination of 3D distribution of specific proteins, ions, GNA or DNA in single living cells. Effective use of this technology requires a combination of optical and computer hardware and software for image restoration, feature extraction and computer graphics.The digital imaging microscope consists of a conventional epifluorescence microscope with computer controlled focus, excitation and emission wavelength and duration of excitation. Images are recorded with a cooled (-80°C) CCD. 3D images are obtained as a series of optical sections at .25 - .5 μm intervals.A conventional microscope has substantial blurring along its optical axis. Out of focus contributions to a single optical section cause low contrast and flare; details are poorly resolved along the optical axis. We have developed new computer algorithms for reversing these distortions. These image restoration techniques and scanning confocal microscopes yield significantly better images; the results from the two are comparable.

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