... fibrosis transmembrane conductance regulator (Cftr) to secrete Cl − . We performed transcriptomic, molecular, and functional studies to identify Cl − transporters in the seawater-type ionocytes of sea lamprey ( Petromyzon marinus ). Gill cftr expression was minimal or undetectable in larvae and post...

...Joshua R. York; David W. McCauley; Michael H. Dickinson; Leslie B. Vosshall; Julian A. T. Dow ABSTRACT Lampreys and hagfishes are the only surviving relicts of an ancient but ecologically dominant group of jawless fishes that evolved in the seas of the Cambrian era over half a billion years ago...

..., particularly for anguilliform swimmers, such as the sea lamprey Petromyzon marinus . For this study, we compared the kinematics and hydrodynamics of larval sea lampreys with those of lampreys accelerating from rest during escape swimming. We used experimentally derived velocity fields to calculate pressure...

...Megan C. Leftwich; Eric D. Tytell; Avis H. Cohen; Alexander J. Smits SUMMARY A robotic lamprey, based on the silver lamprey, Ichthyomyzon unicuspis , was used to investigate the influence of passive tail flexibility on the wake structure and thrust production during anguilliform swimming...

... different virtual swimmers: a carangiform swimmer (i.e. a mackerel swimming like mackerel do in nature); an anguilliform swimmer (i.e. a lamprey swimming like lampreys do in nature); a hybrid swimmer with anguilliform kinematics but carangiform body shape (a mackerel swimming like a lamprey); and another...

... varied. The virtual swimmer is a 3-D lamprey-like flexible body undulating with prescribed experimental kinematics of anguilliform type. Simulations are carried out for three Reynolds numbers spanning the transitional and inertial flow regimes, Re =300, 4000(viscous flow), and ∞ (inviscid flow). The net...

...O. S. E. Gustafsson; S. P. Collin; R. H. H. Kröger SUMMARY Jawless fishes (Agnatha; lampreys and hagfishes) most closely resemble the earliest stage in vertebrate evolution and lamprey-like animals already existed in the Lower Cambrian [about 540 million years ago (MYA)]. Agnathans are thought...

...Patrick Reis-Santos; Stephen D. McCormick; Jonathan M. Wilson SUMMARY Ammocoetes of the anadromous sea lamprey Petromyzon marinus L. spend many years in freshwater before metamorphosing and migrating to sea. Metamorphosis involves the radical transformation from a substrate-dwelling,filter feeder...

...Elena L. Pavlova; Lyudmila B. Popova; Grigori N. Orlovsky; Tatiana G. Deliagina SUMMARY Removal of a vestibular organ (unilateral labyrinthectomy, UL) in the lamprey results in a loss of equilibrium, so that the animal rolls (rotates around its longitudinal axis) when swimming. Owing to vestibular...

...Helmut Bartels; Ian C. Potter SUMMARY Lampreys, one of the only two surviving groups of agnathan (jawless)vertebrates, contain several anadromous species that, during their life cycle,thus migrate from fresh to seawater and back to freshwater. Lampreys have independently evolved the same overall...

...Pavel V. Zelenin; Sten Grillner; Grigori N. Orlovsky; Tatiana G. Deliagina SUMMARY The lamprey swims by caudally directed lateral undulations of its body. During swimming the animal is oriented with its dorsal side up, and any deviation from this posture (roll tilt) elicits a corrective motor...

...Hayden-William Courtland; Glenda M. Wright; Robert G. Root; M. Edwin DeMont SUMMARY In contrast to all other vertebrate cartilages, the major extracellular matrix protein of lamprey cartilages is not collagen. Instead, there exists a unique family of noncollagenous structural proteins...

...Malinda R. Boyd; Andrew D. McClellan SUMMARY In larval lamprey, locomotor activity recorded from whole animals and in vitro brain/spinal cord preparations was analyzed to determine how two parameters of locomotor activity, burst proportion (BP; relative duration of motor burst activity...

...Li Guan; Tim Kiemel; Avis H. Cohen SUMMARY A semi-reduced, minimally restrained lamprey preparation was used to investigate the impact of movement and movement-related feedback during d -glutamate-induced locomotion. The preparation consisted of the trunk alone with the spinal cord exposed...

...Frank B. Jensen SUMMARY Autoxidation of oxyhaemoglobin (oxyHb) to methaemoglobin was measured at different temperatures in haemoglobin solutions from Atlantic hagfish, river lamprey, common carp, yellowfin tuna and pig. The aims were to evaluate the impact of the absent distal histidine in hagfish...

...Frank B. Jensen ABSTRACT Agnathans, comprising lamprey and hagfish species, have been reported to be practically devoid of HCO 3 − /Cl − exchange across the red blood cell membrane. This suggests that the capacity of their haemoglobin (Hb) to remove H + is essential for obtaining a high CO 2...

...J. Anne Brown; J. Clifford Rankin ABSTRACT Previous studies have suggested that in the lamprey Lampetra fluviatilis , in contrast to teleost fish, all glomeruli are actively filtering. In the present study, we have applied the ferrocyanide technique to obtain more definitive values...

...Leila V. Virkki; Annika Salama; Mikko Nikinmaa ABSTRACT We have measured the effects of oxygen tension on the transport of Na + , K + and Cl − across the erythrocyte membrane of the lamprey Lampetra fluviatilis . The transport of each ion was affected by the oxygen tension of the medium. Hypoxic...

...T. Toop; D. Grozdanovski; I. C. Potter ABSTRACT Iodinated atrial natriuretic peptide (ANP) binding sites were examined in the gills and ventral aorta of the adult upstream-migrating lamprey Geotria australis using tissue section autoradiography, in vitro competition analysis and affinity cross...

...Thelma L. Williams; Graham Bowtell; N. A. Curtin ABSTRACT Experiments were performed on single-myotome preparations of lamprey muscle, to discover whether force developed by intermittent tetanic stimulation during imposed sinusoidal movement could be predicted by data collected from isometric...