Giardia is a cute flagellate with two nuclei, eight flowing flagella and an impressive sucker plate that makes it look rather like a catfish. Their elegant swimming patterns are reminiscent of one as well. Giardia also lacks canonical mitochondria, instead harbouring highly reduced derivatives called mitosomes. Thus, it's not particularly fond of oxygen -- recall that mitochondria are involved in oxygen-based respiration. As far as lifestyles go, that usually means one of two things: either they love rotting black goo purged of much of the oxygen by the decay activity; or they inhabit some other critter. Thus, many anaerobes are symbionts: mutualists or parasites (or commensals). Note that by far, not all parasites and mutualists are anaerobes.Oh, I should probably mention a minor detail: Giardia is notorious for giardiasis -- also known as beaver fever -- a nasty disease obtained from drinking outdoor -- and otherwise contaminated -- water, especially from slow-moving streams and water downstream of dead animals, faeces, etc. To normal, well-balanced people, this means Giardia is to be avoided at all costs, and that research must be done to either get rid of it or make the sickness marginally more bearable. To a protist nut, the clinical importance means we can have a better understanding of a phylogenetically unique and fascinating model organism. Excavates , the group containing Giardia , are diverse but not particularly well-understood. Naegleria and trypanosomes are fellow opportunists and parasites, respectively, who bring ire upon humans and attract scientific funding. Giardia is on the other branch of the most basic divide between groups of Excavates, however -- closer to the enigmatic parabasalids and oxymonads of the termite gut. Oh, and they're also literally double cells -- two nuclei, and two sets of four flagella, in a mirrored arrangement. What more can a cell biologist want? [More]
Monday, 27 May 2013
17:25
nitin
news
No comments
Related Posts:
New MERS Virus Threat To The Entire World Says WHO LeaderIn a speech this week, Margaret Chan, the Director-General of the World Health Organization (WHO) warned that the newly named Middle East respiratory syndrome coronavirus (MERS-CoV) is a "threat to the entire world". Her warn… Read More
More Than 500 Million Photos Are Shared Every Day If it feels like you're increasingly bombarded by photos from friends and family, you're not aloneMary Meeker, a renowned analyst with Kleiner Perkins Caufield Byers, estimates that there are now more than 500 million phot… Read More
This Is What Happens When a Toddler Tries on Google Glass It's tough to be a kid. You may not have a job to commute to or bills to pay, but you do have to navigate a world that is, in every way, too big for you — a world that is, understandably but also frustratingly, optimized… Read More
What It's Like to Attend Mashable's Online Career Fair Mashable has one of the most influential communities online. We recognize that our readers are more familiar with digital culture and technology than the average internet user. Since we appreciate our community’s engagemen… Read More
Facebook Launches Verified Accounts Did the real Justin Bieber just send you a friend request? Now you can know for sure, thanks to a new Facebook feature: Verified Pages.Much like verified accounts on Twitter, verified Facebook pages will now display a smal… Read More
Subscribe to:
Post Comments (Atom)
0 comments:
Post a Comment