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32 results
  • Formation of the initial kidney and mouth opening in larval amphioxus studied with serial blockface scanning electron microscopy (SBSEM). [Journal Article]
    Evodevo. 2018; 9:16.Holland ND
  • CONCLUSIONS: SBSEM has provided the most accurate and detailed description to date of the tissues at the anterior end of amphioxus larvae. The present study supports the finding of Kaji et al. (2016) that the more dorsal of the cells in the posterior region of the first left somite give rise to the initial kidney. In contrast, the fate of the more ventral cells (called here the oral mesoderm) is less well understood. Although Kaji et al. (2016) implied that all of the oral mesoderm cells joined the rim of the forming mouth, SBSEM reveals that many of them are still present after mouth penetration. Even so, some of those cells go missing during mouth penetration and their fate is unknown. It cannot be ruled out that they were incorporated into the rim of the nascent mouth as proposed by Kaji et al. (2016). On the other hand, they might have degenerated or been shed from the larva during the morphogenetic interaction between the ectoderm and endoderm to form the mouth. The present SBSEM study, like Kaji et al. (2016), is based on static morphological data, and dynamic cell tracer experiments would be needed to decide among these possibilities.
  • The long and winding path to understanding kidney structure in amphioxus - a review. [Review]
    Int J Dev Biol. 2017; 61(10-11-12):683-688.Holland ND
  • The history of studies on amphioxus kidney morphology is reviewed with special attention to four zoologists who made important early contributions. In 1884, Hatschek described a single anterior nephridial tubule in larval and adult amphioxus. Subsequently, in 1890, Weiss and Boveri independently found multiple branchial nephridia (morphologically similar to Hatschek's nephridium) associated with …
  • Amphioxus mouth after dorso-ventral inversion. [Journal Article]
    Zoological Lett. 2016; 2:2.Kaji T, Reimer JD, … Yasui K
  • CONCLUSIONS: We conclude that the amphioxus mouth, which uniquely involves a mesodermal coelomic vesicle, shares its evolutionary origins with the ambulacrarian coelomic pore-canal. Our observations suggest that there are at least three types of mouths in deuterostomes, and that the new acquisition of chordate mouths was likely related to the dorso-ventral inversion that occurred in the last common ancestor of chordates.
  • The nephridial hypothesis of the gill slit origin. [Journal Article]
    J Exp Zool B Mol Dev Evol. 2015 Dec; 324(8):647-52.Ezhova OV, Malakhov VV
  • Metameric gill slits are mysterious structures, unique for Chordata and Hemichordata, and also, perhaps, for the extinct Cambrian Calcichordata. There is a discussed hypothesis of the gill slits origin from the metameric nephridia. According to the hypothesis, the hypothetical metameric deuterostome ancestor had in each segment a pair of coelomoducts and a pair of intestinal pockets. In the anter…
  • Effects of environmental factors on sperm motility and fertilization rate of Phascolosoma esculenta. [Journal Article]
    Acta Biol Hung. 2014 Sep; 65(3):274-84.Sheng Z, Jiang JH, … Zhu JQ
  • The study investigated the effects of environmental factors (salinity, pH, ions and activation media) on sperm motility (activation rate, duration of quick movement, and lifespan) and fertilization rate of Phascolosoma esculenta. The results showed that spermatozoa in the coelom and nephridium are able to move quickly. The optimal salinity was 14.64 to 43.35 and the optimal pH was 6.46 to 9.53 fo…
  • Selective recruitment of bacteria during embryogenesis of an earthworm. [Journal Article]
    ISME J. 2008 May; 2(5):510-8.Davidson SK, Stahl DA
  • Earthworms of the family Lumbricidae harbor specific and stable populations of Acidovorax-like bacteria within their excretory organs, the nephridia. The symbionts of Eisenia foetida are deposited into the egg capsules during mating and the nephridia of the juveniles are colonized before they hatch. The timing and mechanisms governing bacterial recruitment and colonization are unknown for the ear…
  • [Parasitic metamorphosis development of Lamprotula fibrosa]. [Journal Article]
    Ying Yong Sheng Tai Xue Bao. 2000 Feb; 11(1):131-4.Yang X, Gong S, … Zhu Z
  • The glochidia of Lamprotula fibrosa develop to maturity in the outer gill of female and are expelled to the outside in winter, and then, the mature glochidia are parasitized to the gill of fish host and start the parasitic metamorphosis development. The parasitic period lasts about 4 months. The inner and outer byssuses disappear after parasitizing for 3 days. The foots develop after 35 days. The…
  • An endogenous peptide modulates the activity of a sensory neurone in the leech Hirudo medicinalis. [Journal Article]
    J Exp Biol. 1995 Jun; 198(Pt 6):1405-15.Wenning A, Calabrese RL
  • Sensory and neurosecretory innervation of each leech excretory complex, a nephridium and its bladder, is accomplished by a single neurone, the nephridial nerve cell (NNC). The NNC monitors the extracellular Cl- concentration, which ranges between 20 and 100 mmol l-1 depending on the physiological state. The NNC contains FMRFamide in its soma and sensory terminals in the nephridium. Bath or focal …
  • Organogenesis in the leech: development of nephridia, bladders and their innervation. [Journal Article]
    Roux Arch Dev Biol. 1993 Aug; 202(6):329-340.Wenning A, Cahill MA, … Kaltenhäuser U
  • The formation of the definitive excretory system (nephridium and bladder complex) in Hirudo medicinalis during the last two thirds of embryonic development was observed with light- and electron microscopy, immunocytochemistry, and nuclear labeling. In jawed leeches, two excretory systems develop and function successively. The nephridia of the cryptolarva are associated with the larval sac and per…
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