Pushing versus pulling: division of labour between tarsal attachment pads in cockroaches
نویسندگان
چکیده
منابع مشابه
Pushing versus pulling: division of labour between tarsal attachment pads in cockroaches.
Adhesive organs on the legs of arthropods and vertebrates are strongly direction dependent, making contact only when pulled towards the body but detaching when pushed away from it. Here we show that the two types of attachment pads found in cockroaches (Nauphoeta cinerea), tarsal euplantulae and pretarsal arolium, serve fundamentally different functions. Video recordings of vertical climbing re...
متن کاملAsymmetry between pushing and pulling for crawling cells.
Eukaryotic cells possess motility mechanisms allowing them not only to self-propel but also to exert forces on obstacles (to push) and to carry cargoes (to pull). To study the inherent asymmetry between active pushing and pulling we model a crawling acto-myosin cell extract as a one-dimensional layer of active gel subjected to external forces. We show that pushing is controlled by protrusion an...
متن کاملPushing and Pulling in Prokaryotic DNA Segregation
In prokaryotes, DNA can be segregated by three different types of cytoskeletal filaments. The best-understood type of partitioning (par) locus encodes an actin homolog called ParM, which forms dynamically unstable filaments that push plasmids apart in a process reminiscent of mitosis. However, the most common type of par locus, which is present on many plasmids and most bacterial chromosomes, e...
متن کاملSpindle Positioning: Actin Mediates Pushing and Pulling
To divide asymmetrically, the mitotic spindle is moved from the cell center to the cortex, a process that requires astral microtubules and the microtubule-based motor dynein. New work examining spindle positioning in large oocytes shows that in these cells actin and actin polymerization plays a key role.
متن کاملPulling, Pushing, and Grouping for Image Segmentation
This paper presents a novel computational visual grouping method, termed pulling, pushing and grouping, or PPG for short. Visual grouping is formulated as a functional optimisation process. Our computational function has three terms, the first pulls similar visual cues together, the second pushes different visual cues apart, and the third groups spatially adjacent visual cues without regarding ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the Royal Society B: Biological Sciences
سال: 2008
ISSN: 0962-8452,1471-2954
DOI: 10.1098/rspb.2007.1660