Removing protists from NPV solution
daniel at chulkn.chula.ac.th
Tue Nov 23 17:43:11 EST 1993
One urgent question.
How can I eliminate microsporidia in my virus solution?
I need an answer to this question by Wednesday morning (24 November 1993)
in order to save the following experiment.
Experiment: Viability of Nuclear Polyhedrosis Virus excreted by two
reptiles and an amphibian.
1) Determine the viability of excreted Nuclear Polyhedrosis Virus
2) Estimate the quantity of virus ingested and excreted by the reptiles
I fed caterpillars (Spodoptera. exigua) infected with NPV to a
skink and a lizard and a toad. However, I did not know that the
caterpillars were also infected with a nasty microsporidian. The feces
from all three animals were collected and centrifuged to produce three 1
ml solutions of NPV (one solution from each animal). I want to bio-assay
these three solutions to test the viability of the PV in them. However,
all threey solutions are contaminated with microsporidia (a protozoan).
(This is an interesting finding in itself, it implies that both NPV and
microsporidia can withstand the vagaries of a trip through the vertebrate
Nevertheless, I need to selectively get rid of the microsporidia
in order test the viability of NPV with a bio-assay. If I can separate
NPV and microsporidia without damaging either then I can separately test
the viability of each.
1) use a selective anti-biotic against the microsporidia
2) pasteurize the solution and hope that one will be destroyed and the
3) use some form of a gradient
b) sucrose gradient?
Thanks in advance. BTW, please post answers directly to my e-mail address
below as I have no direct access to this group.
35/1-2 Soi Aladin
e-mail: daniel at chulkn.chula.ac.th
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