منابع مشابه
GREEN STURGEON The green sturgeon and its environment: introduction
The green sturgeon, Acipenser medirostris, is one of two acipenserid fishes native to the temperate waters of the Pacific coast of North America. Originally, three species of sturgeon were described from this region, and this one named ‘‘medirostris’’ or ‘‘middle snout’’ based on the length of its rostrum relative to the other purported species (Ayers 1854), both of which were later determined ...
متن کاملReplication and pathogenesis of white sturgeon iridovirus (WSIV) in experimentally infected white sturgeon Acipenser transmontanus juveniles and sturgeon cell lines.
Characteristics of the in vitro propagation of the white sturgeon iridovirus (WSIV) were examined in 6 sturgeon cell lines. One new cell line originating from gonadal tissues (WSGO) produced up to 12-fold more WSIV [approximately 22 TCID50 (50% tissue culture infective dose) cell-1], than that of a previously established reference spleen cell line (WSS-2). Infected WSGO cell cultures were exami...
متن کاملThe Kootenai River white sturgeon Acipenser transmontanus
is a landlocked population restricted to a 270 km stretch of the Kootenai River, which flows from western Montana through northern Idaho and into British Columbia. This population has shown an almost complete lack of natural juvenile recruitment since 1974. The total adult population in 1998 was estimated to be about 650 individuals and this fish is currently classified as endangered by the Ida...
متن کاملFishery selection across the millennia.
Humans have been exploiting the Earth’s resources for ages. Owing to tool limitations and risk of injury (including death), early human hunters targeted those individuals that were relatively easy to kill. On land, for instance, human hunters selectively targeted prey in poor condition, that is, the weak, sick, young and old. In the ocean, early humans selectively targeted accessible prey, that...
متن کاملSturgeon, The FISH BP Never Really Caught
The German armed forces employed three different types of teleprinter cipher machines during the Second World War, the Lorenz machines SZ40 and SZ42 also called Tunny by Bletchley Park (BP), the Siemens Schlüsselfernschreibmaschine (SFM) T52, and the one-time-tape machine T43, also manufactured by Siemens. The Lorenz machines, which existed in three different models, SZ40, SZ42a, and SZ42b, are...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1883
ISSN: 0036-8733
DOI: 10.1038/scientificamerican07281883-52