Results 131 to 140 of about 12,888 (189)

Tunicate feeding filters

Journal of the Marine Biological Association of the United Kingdom, 2003
This review discusses the structure and operation of the fine mesh ‘mucous’ feeding filters of tunicates. The function of the endostyle in producing the feeding filter and the different ways in which the filter is deployed are also described.The fine structure of the filter includes new data, and the ultrastructural dimensions of the filter mesh and ...
Bone, Q, Carre, C, Chang, P
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Unconventional Signalling in Tunicates

Marine and Freshwater Behaviour and Physiology, 1995
The zooids in colonial tunicates do not appear to be directly interconnected by nerves, but this has not prevented the evolution of coordinated behaviour in several groups. In Botryllus and other colonial styelid asci‐dians the endothelium lining the blood vessels is excitable and transmits action potentials from cell to cell via gap junctions.
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Pelagic Tunicates: Why Gelatinous?

The American Naturalist, 2001
Neutrally buoyant zooplankton are virtually free from the gravitational forces acting on terrestrial organisms, which allows for their adoption of large, watery bodies (Harbison 1992). Although this morphological trait is present in several phyla and is nearly ubiquitous in marine systems, the reasons for its great success remain an evolutionary ...
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Antitumor compounds from tunicates

Medicinal Research Reviews, 2000
Of the six marine-derived compounds that have reached clinical trials as antitumor agents three-didemnin B, Aplidine, and ecteinascidin 743-are derived from tunicates. Di-demnin B (DB), a cyclic depsipeptide from the compound tunicate Trididemnum solidum, was the first marine-derived compound to enter Phases I and II clinical trials.
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Fibrous pseudotumor of testicular tunic

Urology, 1982
Abstract Fibrous pseudotumor of the testicular tunic is a non-neoplastic reactive process of the tunica vaginalis in which multiple firm nodules occur in the thickened serosal covering of the tunica or may even be free within it. The morphologic changes reveal a cellular spectrum that includes granulation tissue, fibroblastic proliferationm and ...
S M, Sajjad, M R, Azizi, L, Llamas
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Humoral Factors in Tunicates

1996
It is well known that vertebrates have a sophisticated recognition system known as the immune system. Using this immune system, animals can eliminate invasive microorganisms, such as viruses, bacteria, and parasites, and can also clear denatured cells and metabolic wastes from their bodies.
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Vanadium content of some tunicates

Comparative Biochemistry and Physiology, 1963
Abstract 1. 1. Twenty-nine species of tunicates were examined for vanadium. 2. 2. High concentrations of vanadium were observed only in ascidians of the order Phlebobranchia. 3. 3. Centrifuged blood cells of Ascidia nigra (Savigny) were found to contain 1.45 per cent vanadium. 4. 4. Eggs of Phallusia mamillata Cuvier yielded 0·017
L S, CIERESZKO, E M, CIERESZKO, E R, HARRIS, C A, LANE   +3 more
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The Chemistry of Marine Tunicates

2012
Alkaloids, Peptides, Meroterpenes, Macrolides, Other nonnitrogenous Products, Sulfur-Containing ...
MENNA, MARIALUISA, AIELLO, ANNA
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Acetylcholine and cholinesterase in tunicates

Comparative Biochemistry and Physiology, 1963
Abstract 1. 1. The ganglion of Ciona intestinalis L. was isolated and extracted. Acetylcholine determinations by bioassay on isolated hearts of Venus and Tapes indicated an acetylcholine content of 20–120 μg/g wet weight. The acetylcholine content of the body wall (without tunic) was found to be between 0·01 and 0·2 μg/g wet weight. 2.
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Cytotoxic Activity of Tunicate Hemocytes

1996
Tunicates (protochordates) are filter-feeding marine invertebrates with a worldwide distribution. In their larval form, they exhibit many of the features characteristic of the vertebrates. The larva, with a tail, notochord, and dorsal neural tube, upon settlement undergoes a remarkable metamorphosis in which it loses most of its chordate ...
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