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Navicula
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<h2 id="description">Description</h2> <p><i>Navicula</i> species are <a href="/facts/Pennate_diatoms/77NPKtWJ">pennate diatoms</a>. Their valves are typically elliptical, though some species have more pinched ends than others. <i>Navicula</i> cells have two <a href="/facts/Chloroplast/fo8U3yTx">chloroplasts</a>, one along each side of the valve along the girdle bands. </p> <h2 id="mobility">Mobility</h2> <p><i>Navicula</i> diatoms are highly motile and move through a gliding movement<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a><a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> This is done through excretion of <a href="/facts/Extracellular_polymeric_substance/5u7aCf2l">extracellular polymeric substances</a> (EPS). One form of EPS surrounds the outside of the cell and another is excreted through a slit in the <a href="/facts/Frustule/rP9gb43e">frustule</a> called a raphe, allowing the cell to glide along a track.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> </p> <h2 id="external-links">External links</h2> <ul><li><a href="https://web.archive.org/web/20120205010410/http://biology.missouristate.edu/phycology/asian%20carp/navicula%20(40x)-w.jpg"><i>Navicula</i> Image (Missouri State University)</a></li> <li><a href="http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artnov01/roldiatom7.html"><i>Navicula</i> sp. Diatoms from Guaíba island, Rio de Janeiro.</a></li> <li><a href="https://web.archive.org/web/20060818063256/http://vis-pc.plantbio.ohiou.edu/algaeimage/pages/Navicula.html">Bacillariophyceae - <i>Navicula</i> Ohio University</a></li> <li><a href="https://www.marinespecies.org/aphia.php?p=taxdetails&id=149142">"Navicula"</a>. <i>WoRMS</i>. <a href="/facts/World_Register_of_Marine_Species/lfmyq6bH">World Register of Marine Species</a>.</li> <li> Media related to Navicula at Wikimedia Commons</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>M.D. Guiry (2015). Guiry, M.D.; Guiry, G.M. (eds.). "AlgaeBase". World-wide electronic publication, National University of Ireland, Galway. Retrieved 2015-08-15. <a href="/wiki/Michael_D._Guiry" target="_blank">/wiki/Michael_D._Guiry</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Oxford English Dictionary, "Navicula. 3" <a href="/wiki/Oxford_English_Dictionary" target="_blank">/wiki/Oxford_English_Dictionary</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Oxford English Dictionary, "Navicula. 3" <a href="/wiki/Oxford_English_Dictionary" target="_blank">/wiki/Oxford_English_Dictionary</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Navicula Diatom: Youtube video <a href="https://www.youtube.com/watch?v=AzWolPrYKBw" target="_blank">https://www.youtube.com/watch?v=AzWolPrYKBw</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Gupta, S; Agrawal, SC (2007). "Survival and motility of diatoms Navicula grimmei and Nitzschia palea affected by some physical and chemical factors". Folia Microbiol (Praha). 52 (2): 127–34. doi:10.1007/BF02932151. PMID 17575911. S2CID 20030370. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>J Microbiol Methods. 2013 Mar;92(3):349-54. doi: 10.1016/j.mimet.2013.01.006. Epub 2013 Jan 18. Semi-circular microgrooves to observe active movements of individual Navicula pavillardii cells. Umemura K1, Haneda T, Tanabe M, Suzuki A, Kumashiro Y, Itoga K, Okano T, Mayama S. <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Chen, Lei; Weng, Ding; Du, Chuan; Wang, Jiadao; Cao, Shan (14 May 2019). "Contribution of frustules and mucilage trails to the mobility of diatom Navicula sp". Scientific Reports. 9 (1): 7342. Bibcode:2019NatSR...9.7342C. doi:10.1038/s41598-019-43663-z. PMC 6517400. PMID 31089153. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6517400" target="_blank">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6517400</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> </ol>