P. monodon postlarvae (PL) and juveniles were obtained from
hatcheries and commercial ponds experiencing MSGS in Thailand.
The age and size of the juveniles varied from one to four months in
culture and from 1 to 10 g body weight (BW). The PLs were mostly
PL15 stage, with an approximate BW of 0.1 g. The hepatopancreas
was dissected out and portions were smeared onto glass microscope
slides and stained with haematoxylin and eosin (H&E). Other
hepatopancreatic tissue specimens fixed, embedded, sectioned and
stained for light (LM) and transmission electron (TEM) microscopy.
Samples from individuals positively diagnosed with microsporidian
infections via smears or histology were processed for ultrastructural
investigation. The size of the microsporidian spores was
determined from fresh spores prepared by differential centrifugation
of homogenized, infected hepatopancreatic tissue ending with
Percoll (GE Life Sciences) density gradient centrifugation. The
spore band was removed from the gradient and examined directly
in wet mounts. For LM and TEM, 10 juveniles and 10 PL15 were
sampled. For molecular biology, DNA was extracted from more
than 1000 juveniles and 10,000 PL15
P. monodon postlarvae (PL) and juveniles were obtained from
hatcheries and commercial ponds experiencing MSGS in Thailand.
The age and size of the juveniles varied from one to four months in
culture and from 1 to 10 g body weight (BW). The PLs were mostly
PL15 stage, with an approximate BW of 0.1 g. The hepatopancreas
was dissected out and portions were smeared onto glass microscope
slides and stained with haematoxylin and eosin (H&E). Other
hepatopancreatic tissue specimens fixed, embedded, sectioned and
stained for light (LM) and transmission electron (TEM) microscopy.
Samples from individuals positively diagnosed with microsporidian
infections via smears or histology were processed for ultrastructural
investigation. The size of the microsporidian spores was
determined from fresh spores prepared by differential centrifugation
of homogenized, infected hepatopancreatic tissue ending with
Percoll (GE Life Sciences) density gradient centrifugation. The
spore band was removed from the gradient and examined directly
in wet mounts. For LM and TEM, 10 juveniles and 10 PL15 were
sampled. For molecular biology, DNA was extracted from more
than 1000 juveniles and 10,000 PL15
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P. monodon postlarvae (PL) and juveniles were obtained from
hatcheries and commercial ponds experiencing MSGS in Thailand.
The age and size of the juveniles varied from one to four months in
culture and from 1 to 10 g body weight (BW). The PLs were mostly
PL15 stage, with an approximate BW of 0.1 g. The hepatopancreas
was dissected out and portions were smeared onto glass microscope
slides and stained with haematoxylin and eosin (H&E). Other
hepatopancreatic tissue specimens fixed, embedded, sectioned and
stained for light (LM) and transmission electron (TEM) microscopy.
Samples from individuals positively diagnosed with microsporidian
infections via smears or histology were processed for ultrastructural
investigation. The size of the microsporidian spores was
determined from fresh spores prepared by differential centrifugation
of homogenized, infected hepatopancreatic tissue ending with
Percoll (GE Life Sciences) density gradient centrifugation. The
spore band was removed from the gradient and examined directly
in wet mounts. For LM and TEM, 10 juveniles and 10 PL15 were
sampled. For molecular biology, DNA was extracted from more
than 1000 juveniles and 10,000 PL15
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