McGinn, N.A.*; Walker, C.W.: Vitellogenesis in the green sea urchin, Strongylocentrotus droebachiensis: Localization of vitellogenin protein in gonadal tissue The green sea urchin, Strongylocentrotus droebachiensis, is the focus of a commercial fishery and an aquaculture candidate. It is therefore imperative that we understand the general and reproductive biology of this species. In particular, vitellogenesis is […]

Pak, T.R.*; Lynch, G.R.; Tsai, P.-S.: TESTOSTERONE AND ESTROGEN ACT VIA DIFFERENT PATHWAYS TO INHIBIT PUBERTY IN MALE SIBERIAN HAMSTERS Testosterone (T), dihydrotestosterone (DHT), and 17b-estradiol (E) induce testicular regression in peripubertal, male, Siberian hamsters, Phodopus sungorus. Since T can be converted to DHT or E, whether T acts directly or through its metabolites to […]

MAYER, L.P* and; DYER, C. A.; PROPPER, C. R.: Sexual dimorphism in gonadal steroidogenic factor 1 (SF-1) expression during sexual differentiation and the effects of octylphenol on the differentiation process in the American bullfrog Rana catesbeiana. Gonadal steroidogenesis during development is critical to differentiation of the adult sexually dimorphic phenotype and reproductive function. Environmental contaminants […]

Howdeshell, K.L.*; Ruhlen, R.L.; Welshons, W.V.; vom Saal, F.S.: Serum regulation of estrogenic endocrine-disrupting chemicals during mouse neonatal development Certain chemicals used in plastics and other products are capable of disrupting development by mimicking the action of the sex hormone estradiol, and thus are referred to as estrogenic endocrine disrupting chemicals (EEDCs). While traditional risk […]

SELCER, K.W.*; DAY, A.M.; VERBANIC, J.D.: Northern Leopard Frog (Rana pipiens) Vitellogenin: Purification, Development of an Immunoassay, and Characterization of Induction Following Immersion in Diethylstilbestrol In oviparous vertebrates, estrogen stimulates the female liver to produce the egg yolk precursor, vitellogenin. This protein circulates in the blood, is taken up by oocytes, and is cleaved into […]

CHEEK, A.O.*; BROUWER, T.H.; CARROLL, S.; MANNING, S.; MCLACHLAN, J.A.; BROUWER, M.: Experimental evaluation of vitellogenin as a predictive biomarker for reproductive disruption Vitellogenin (VTG) synthesis in male oviparous vertebrates is used as an indicator of environmental estrogen exposure, yet the reproductive consequences of exposure are unknown. To examine whether VTG expression predicts reproductive impairment, […]

POLK, J.D.: Limb length, body mass and musculoskeletal design The design of the musculoskeletal support system in terrestrial vertebrates is strongly influenced by body mass, with limb postures becoming more extended to moderate increased joint moments. Adaptive differences in limb proportions (e.g., between cursors and noncursors) should also influence joint moments and animals with longer […]

WALTER , Rebecca M: Kinematics of 90 Degree Running Turns in Wild Mice To gain insight on the turning kinematics of small mammals, I videotaped six adult wild mice from below at 250 Hz as they performed ninety-degree running turns. Five markings on the sagittal axis were digitized to allow observation of lateral bending and […]

GILLIS, G.B.*; FLYNN, J.P.; BIEWENER, A.A.: In Vivo Patterns of Strain and Activity in Thigh Muscles of Goats During Locomotion To date, studies of limb muscle function during terrestrial locomotion have focused largely on extensors acting at the ankle joint, and have often emphasized the nearly isometric behavior of these muscles when active. In contrast, […]

WUNDERLICH, R.E.*; SCHAUM, J.C.; KILKENNY, P.; SINOPOLI, M.C.: Hindlimb kinematics during bipedalism in Propithecus Propithecus is one of only a few primates to habitually travel bipedally when on the ground, yet little attention has been given to this mechanically challenging aspect of their locomotion. Vertical clinging and leaping (VCL) in indrid primates has been of […]