Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Mark F. Feldlaufer"'
Autor:
Anna Rachinsky, Mark F. Feldlaufer
Publikováno v:
Journal of Insect Physiology. 46:41-46
Five neuropeptides with known allatotropic or allatostatic activity in other insect species were examined for their effects on honey bee corpora allata. Using an in vitro radiochemical assay, we assessed the ability of these peptides to affect the bi
Publikováno v:
Archives of Insect Biochemistry and Physiology. 31:305-312
The larval midgut of the tobacco hornworm, Manduca sexta, has high ecdysone 20-monooxygenase (EZOMO) activity, located both in the mitochondria and in the microsomes. The apparent kinetic parameters for E20MO in mitochondria and microsomes were deter
Autor:
Gunter F. Weirich, Ashok K. Raina, Edward P. Masler, Mark F. Feldlaufer, Jan Kochansky, James A. Svoboda, William R. Lusby
Publikováno v:
Experientia. 51:961-966
The tritium-labeled bis-norleucine analog of Helicoverpa zea pheromone biosynthesis-activating neuropeptide ([3H]NLPBAN) was incubated in vitro with hemolymph from Manduca sexta or H. zea adult females. The incubations resulted in the formation of se
Publikováno v:
Archives of Insect Biochemistry and Physiology. 23:199-211
The activities of ecdysone oxidase (EO), 3-oxoecdysteroid 3α-reductase (3α-R), and 3-oxoecdysteroid 3β-reductase (3β-R) were determined for epidermis, hemolymph, and fat body of wandering fifth instar Manduca sexta larvae and for midguts of vario
Publikováno v:
Insect biochemistry and molecular biology. 30(8-9)
Juvenile hormone (JH) is considered the prime endogenous signal for the induction of queen development in honey bees (Apis mellifera L.). At the beginning of the last (5th) larval stadium, worker corpora allata synthesize less JH than queen corpora a
Autor:
Malcolm J. Thompson, Huw H. Rees, Mark F. Feldlaufer, James A. Svoboda, Kenneth R. Wilzer, W. R. Lusby, Ruben Lozano
Publikováno v:
Archives of Insect Biochemistry and Physiology. 4:1-15
Following injection into female Manduca sexta pupae, [14C]cholesterol is converted to a radiolabeled C21 nonecdysteroid conjugate as well as ecdysteroid conjugates, which in ovaries and newly-laid eggs consist mainly of labeled 26-hydroxyecdysone 26-
Autor:
Gunter F. Weirich, Mark F. Feldlaufer, Huw H. Rees, Malcolm J. Thompson, Kenneth R. Wilzer, James A. Svoboda
Publikováno v:
Archives of Insect Biochemistry and Physiology. 2:227-236
The major ecdysteroid conjugate present in eggs (48–64 h old) of the tobacco hornworm has been purified by XAD-2 chromatography, C18 SEP-PAK separations, and ion suppression reversed-phase high-performance liquid chromatography. Enzymatic hydrolysi
Publikováno v:
Insect Biochemistry. 18:219-221
Four age groups (0–1 h; 1–18 h; 24–40 h; 72–88 h) of unfertilized eggs of the tobacco hornworm, Manduca sexta, were examined for the presence of free ecdysteroids and ecdysteroid conjugates. High levels (42.46–51.17 μg/g fresh wt) of 26-hy
Publikováno v:
Lipids. 21(1)
To determine the precursors and the fate of 26-hydroxyecdysone in eggs, the fate of labeled putative ecdysteroid precursors was examined in the tobacco hornworm,Manduca sexta. Following injection of [(14)C]cholesterol, 22,25[(14)C]dideoxyecdysome or