The anatomy of the blood vascular system of the giant vestimentiferan tubeworm Riftia pachyptila (Siboglinidae, Annelida)

2017 ◽  
Vol 278 (6) ◽  
pp. 810-827 ◽  
Author(s):  
Nadezhda N. Rimskaya-Korsakova ◽  
Sergey V. Galkin ◽  
Vladimir V. Malakhov
Keyword(s):  
Vascular System ◽  
Riftia Pachyptila ◽  
Vestimentiferan Tubeworm

Organization of the tentacular apparatus of the vestimentiferan tubeworm Riftia pachyptila, Jones 1981 (Annelida, Vestimentifera)

2010 ◽  
Vol 433 (1) ◽  
pp. 257-260 ◽  
Author(s):  
N. N. Rimskaya-Korsakova ◽  
V. V. Malakhov
Keyword(s):  
Riftia Pachyptila ◽  
Vestimentiferan Tubeworm

Effects of metabolite uptake on proton-equivalent elimination by two species of deep-sea vestimentiferan tubeworm,Riftia pachyptilaandLamellibrachiacfluymesi: proton elimination is a necessary adaptation to sulfide-oxidizing chemoautotrophic symbionts

2002 ◽  
Vol 205 (19) ◽  
pp. 3055-3066 ◽  
Author(s):  
P. R. Girguis ◽  
J. J. Childress ◽  
J. K. Freytag ◽  
K. Klose ◽  
R. Stuber
Keyword(s):  
Inorganic Carbon ◽  
Prolonged Exposure ◽  
Sulfide Oxidation ◽  
Waste Product ◽  
Energetic Cost ◽  
Riftia Pachyptila ◽  
Waste Products ◽  
Urechis Caupo ◽  
Vestimentiferan Tubeworm ◽  
Chemolithoautotrophic Bacteria

SUMMARYIntracellular symbiosis requires that the host satisfy the symbiont's metabolic requirements, including the elimination of waste products. The hydrothermal vent tubeworm Riftia pachyptila and the hydrocarbon seep worm Lamellibrachia cf luymesi are symbiotic with chemolithoautotrophic bacteria that produce sulfate and protons as end-products. In this report, we examine the relationship between symbiont metabolism and host proton equivalent elimination in R. pachyptilaand L. cf luymesi, and the effects of sulfide exposure on proton-equivalent elimination by Urechis caupo, an echiuran worm that lacks intracellular symbionts (for brevity, we will hereafter refer to proton-equivalent elimination as `proton elimination'). Proton elimination by R. pachyptila and L. cf luymesi constitutes the worms' largest mass-specific metabolite flux, and R. pachyptilaproton elimination is, to our knowledge, the most rapid reported for any metazoan. Proton elimination rates by R. pachyptila and L.cf luymesi correlated primarily with the rate of sulfide oxidation. Prolonged exposure to low environmental oxygen concentrations completely inhibited the majority of proton elimination by R. pachyptila,demonstrating that proton elimination does not result primarily from anaerobic metabolism. Large and rapid increases in environmental inorganic carbon concentrations led to short-lived proton elimination by R. pachyptila, as a result of the equilibration between internal and external inorganic carbon pools. U. caupo consistently exhibited proton elimination rates 5-20 times lower than those of L. cf luymesi and R. pachyptila upon exposure to sulfide. Treatment with specific ATPase inhibitors completely inhibited a fraction of proton elimination and sulfide and inorganic carbon uptake by R. pachyptila, suggesting that proton elimination occurs in large part via K+/H+-ATPases and Na+/H+-ATPases. In the light of these results, we suggest that protons are the primary waste product of the symbioses of R. pachyptila and L. cf luymesi, and that proton elimination is driven by symbiont metabolism, and may be the largest energetic cost incurred by the worms.

Comparative branchial plume biometry between two extreme ecotypes of the hydrothermal vent tubeworm Ridgeia piscesae

2006 ◽  
Vol 84 (12) ◽  
pp. 1810-1822 ◽  
Author(s):  
A.C. Andersen ◽  
J.F. Flores ◽  
S. Hourdez
Keyword(s):  
Body Mass ◽  
Riftia Pachyptila ◽  
Rock Outcrops ◽  
Total Body Mass ◽  
Gas Uptake ◽  
Ridgeia Piscesae ◽  
Surface Areas ◽  
Juan De Fuca ◽  
Vestimentiferan Tubeworm ◽  
Total Body

The vestimentiferan tubeworm Ridgeia piscesae Jones, 1985 from the Juan de Fuca Ridge is a morphologically plastic species with two contrasted ecotypes. The “chimney-dwelling” ecotype lives along the sides of active hydrothermal chimneys, where temperature and sulfide concentrations are high, but oxygen concentrations are low. Its morphology corresponds to the “short-fat” morphotype. The “basalt-dwelling” ecotype lives on rock outcrops in surrounding basaltic fields, where temperature and sulfide concentrations are low, but oxygen is readily available. Its morphology corresponds to the “long-skinny” morphotype. We compared the ultrastructure and biometry of their branchial plumes, the essential organ for respiration and nutrition in this symbiotic tubeworm. The branchial epidermis of both ecotypes contains electron-dense organelles, which may be related to the presence of sulfides in their environment. The diffusion distance across the gill epidermis is about 20% shorter in the short-fat R. piscesae. For tubeworms of the same mass, specific branchial surface areas (SBSA) are similar in both ecotypes (mean 24 cm2/g for worms of 1–2 g body mass), which is comparable with the SBSA in the vestimentiferan vent tubeworm Riftia pachyptila Jones, 1981 . The SBSA of R. piscesae follows a power curve that is negatively correlated with total body mass. The implications for gas uptake efficiency between these two ecotypes are discussed.

Organization of the tentacular region in the vestimentiferan tubeworm Riftia pachyptila (Annelida, Vestimentifera)

2011 ◽  
Vol 38 (7) ◽  
pp. 667-678 ◽  
Author(s):  
N. N. Rimskaya-Korsakova ◽  
V. V. Malakhov ◽  
S. V. Galkin
Keyword(s):  
Riftia Pachyptila ◽  
Vestimentiferan Tubeworm

A Scanning Electron Microscopic Study of Pro-Vascular Cellular Morphology in Chaetophora Incressata

1985 ◽  
Vol 43 ◽  
pp. 638-639
Author(s):  
A. E. Hotchkiss ◽  
A. T. Hotchkiss ◽  
R. P. Apkarian
Keyword(s):  
Green Algae ◽  
Vascular Plants ◽  
Vascular System ◽  
Higher Plants ◽  
Wall Structure ◽  
Electron Microscopic ◽  
Physiological Processes ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Scanning Electron

Multicellular green algae may be an ancestral form of the vascular plants. These algae exhibit cell wall structure, chlorophyll pigmentation, and physiological processes similar to those of higher plants. The presence of a vascular system which provides water, minerals, and nutrients to remote tissues in higher plants was believed unnecessary for the algae. Among the green algae, the Chaetophorales are complex highly branched forms that might require some means of nutrient transport. The Chaetophorales do possess apical meristematic groups of cells that have growth orientations suggestive of stem and root positions. Branches of Chaetophora incressata were examined by the scanning electron microscope (SEM) for ultrastructural evidence of pro-vascular transport.

Autonomic control of the peripheral vascular system

1970 ◽  
Vol 125 (4) ◽  
pp. 716-724 ◽  
Author(s):  
A. J. Edis
Keyword(s):  
Vascular System ◽  
Autonomic Control ◽  
Peripheral Vascular

Activities of the vascular system during hypoxia: I. The activity of the spleen in hypoxia

1950 ◽  
Author(s):  
Kurt Kramer ◽  
Ulrich C. Luft
Keyword(s):  
Vascular System

Lasertechniques treatment of vascular malformations

Phlebologie ◽  
2010 ◽  
Vol 39 (03) ◽  
pp. 167-175
Author(s):  
M. Poetke ◽  
P. Urban ◽  
H.-P. Berlien
Keyword(s):  
Endothelial Cells ◽  
Spontaneous Regression ◽  
Vascular System ◽  
Vascular Malformations ◽  
Clinical Importance ◽  
Vascular Structure ◽  
Laser Application ◽  
Vascular Morphogenesis ◽  
Structural Abnormalities

SummaryVascular malformations are structural abnormalities, errors of vascular morphogenesis, which can be localized in all parts of the vascular system. All vascular malformations by definition, are present at birth and grow proportionately with the child; their volume can change. In contrast to the haemangiomas, which only proliferate from the endothelial cells the division in stages is of clinical importance. Vascular malformations are divided from the part of vascular system, which is affected.In principle the techniques of laser application in congenital vascular tumours like haemangiomas and in vascular malformations are similar, but the aim is different. In tumours the aim is to induce regression, in vascular malformations the aim is to destroy the pathologic vascular structure because there is no spontaneous regression. This means that the parameters for treatment of vascular malformations must be more aggressive than for vascular tumours.

Adrenergic Stimulation of Regional Plasminogen Activator Release in Rabbits

1992 ◽  
Vol 68 (05) ◽  
pp. 545-549 ◽  
Author(s):  
W L Chandler ◽  
S C Loo ◽  
D Mornin
Keyword(s):  
Lower Extremity ◽  
Plasminogen Activator ◽  
Beta Blocker ◽  
Time Course ◽  
Vascular System ◽  
Adrenergic Stimulation ◽  
Epinephrine Administration ◽  
Adrenergic Antagonist ◽  
Vascular Beds ◽  
Stimulation Of

SummaryThe purpose of this study was to determine whether different regions of the rabbit vascular system show variations in the rate of plasminogen activator (PA) secretion. To start, we evaluated the time course, dose response and adrenergic specificity of PA release. Infusion of 1 µg/kg of epinephrine stimulated a 116 ± 60% (SD) increase in PA activity that peaked 30 to 60 s after epinephrine administration. Infusion of 1 µg/kg of norepinephrine, isoproterenol and phenylephrine had no effect on PA activity. Pretreatment with phentolamine, an alpha adrenergic antagonist, blocked the release of PA by epinephrine while pretreatment with the beta blocker propranolol had no effect. This suggests that PA release in the rabbit was mediated by some form of alpha receptor.Significant arterio-venous differences in basal PA activity were found across the pulmonary and splanchnic vascular beds but not the lower extremity/pelvic bed. After stimulation with epinephrine, PA activity increased 46% across the splanchnic bed while no change was seen across the lower extremity/pelvic bed. We conclude that several vascular beds contribute to circulating PA activity in the rabbit, and that these beds secrete PA at different rates under both basal and stimulated conditions.

Sign in / Sign up

Export Citation Format

Share Document