Search results for "Ciona intestinali"
showing 10 items of 113 documents
Über eine spontane Extrasystolie im Schrittmachersystem des Tunicatenherzens (Ciona intestinalis L.)
1964
Some experimental results on action potential (EKG) in the pacemaker system of the tunicata heart (Ciona intestinalis) are presented. Synchronous records of both end and central heart regions show a spontaneous chance of the electrical activity in the middle of the heart tube, just before the periodic reversal of the direction of the pulsating wave starts. Extra systoles in the central pacemaker influence the terminal centres and provoke reversal.
On the action of chromomycin on the eggs and embryos of Ciona intestinalis.
1964
E stata studiata l'azione della cromomicina sulle uova diCiona intestinalis (Ascidie) in diversi stadi di sviluppo. Essa non esercita alcun effetto sull'uovo vergine o appena fecondato; modifica invece notevolmente la morfogenesi se il trattamento e portato sulle uova in gastrulazione. I risultati vengono spiegati ammettendo che la cromomicina esercita la stessa azione che la actinomicina D e cioe inibisce la sintesi del MRNA.
Erythrocyte agglutinins in the blood of certain Ascidians
1975
Plasma from Ciona intestinalis, Phallusia mamillata and Ascidia malaca possess hemagglutinin for a variety of erythrocytes. Results obtained by physical and chemical treatments suggest that hemagglutinin for Phallusia mamillata and Ascidia malaca may be a protein or a protein-like substance.
A light and electron microscope study of spherical structures in the test cells of an ascidianCiona intestinalis L.
1984
Spherical structures in the test cells that surround the embryos of the ascidianCiona intestinalis L. (Tunicata, phylum Chordata) were studied by both light and electron microscope. Our data support the view that these structures are microorganism-like cells living in symbiosis with the test cells. Their possible role is discussed.
The conservation and diversity of ascidian cells and molecules involved in the inflammatory reaction: The Ciona robusta model
2021
Ascidians are marine invertebrate chordates belonging to the earliest branch (Tunicata) in the chordate phylum, therefore, they are of interest for studying the evolution of immune systems. Due to the known genome, the non-colonial Ciona robusta, previously considered to be C. intestinalis type A, is a model species for the study of inflammatory response. The internal defense of ascidians mainly relies on hemocytes circulating in the hemolymph and pharynx. Hemocytes can be in vivo challenged by LPS injection and various granulocyte and vacuolated cell populations differentiated to produce and release inflammatory factors. Molecular biology and gene expression studies revealed complex defens…
Prophenoloxidase activating system in tunicate hemolymph
1996
The activation sequence and related factors of the prophenoloxidase activating system in crustaceans was compared with the equivalent system in tunicates. Both solitary and colonial ascidians present in their hemolymph a copper-dependent phenoloxidase activity that may be inhibited by tropolone and phenylthiourea. Carbohydrates are able, to various extents, to trigger proPO system which requires serine protease cleavage for activation to phenoloxidase (PO). In some ascidians, hemocytes called ≪morula cells≫ show PO activity, while in Ciona intestinalis the ≪univacuolar refractile granulocytes≫ are positive after cytochemical staining with L-dopa. The relationships between proPO system and d…
Cellule che producono ciTNFalfa sono attive nell'infiammazione e nello sviluppo larvale di Ciona intestinalis
2010
Inflamed adult pharynx tissues and swimming larva of Ciona intestinalis share CiTNFalfa-producing cells
2010
Il fattore di crescita dell'Endotelio vascolare (VEGF) e il suo recettore (VEGFR) nell'ascidia solitaria Ciona intestinalis
2010
Screening of Ovarian steroidogenic pathway in Ciona intestinalis and its modulation after Tributyltin exposure
2010
In this study, we have identified several ovarian steroids in Ciona with high similarity to vertebrate steroids and showed that cholesterol, corticosterone, dehydroepiandrosterone, estrone, estradiol-17beta, testosterone, pregnenolone, progesterone, have identical molecular spectra with vertebrate steroids. In addition, we have studied the effects of an endocrine disruptor (tributyltin: TBT) on these sex hormones and their precursors, ovarian morphology, and gene expression of some key enzymes in steroidogenic pathway in the ovary of Ciona. Ovarian specimens were cultured in vitro using different concentrations of TBT (10{sup -5}, 10{sup -4} and 10{sup -3} M). Ethanol was used as solvent co…