pattern formation
Dotaz
Zobrazit nápovědu
302 s. : il.
AIP Conference Proceedings ; 501
1st ed. xv, 374 s.
- Klíčová slova
- Dynamika, Systémy biologické - formování, Systémy komplexní - formování vzorů,
- Konspekt
- Biologické vědy
- NLK Obory
- biologie
IMA volumes in mathematics and its applications ; vol. 121
1st ed. x, 317 s., obr.
- Klíčová slova
- Formování vzorů - biologie, Modely matematické - biologie,
- Konspekt
- Biologické vědy
- NLK Obory
- biologie
- statistika, zdravotnická statistika
In many arthropods, there is a change in relative segment size during post-embryonic development, but how segment differential growth is produced is little known. A new dataset of the highest quality specimens of the 429 Myr old trilobite Aulacopleura koninckii provides an unparalleled opportunity to investigate segment growth dynamics and its control in an early arthropod. Morphometric analysis across nine post-embryonic stages revealed a growth gradient in the trunk of A. koninckii. We contrastively tested different growth models referable to two distinct hypotheses of growth control for the developing trunk: (i) a segment-specific control, with individual segments having differential autonomous growth progression, and (ii) a regional control, with segment growth depending on their relative position along the main axis. We show that the trunk growth pattern of A. koninckii was consistent with a regional growth control producing a continuous growth gradient that was stable across all developmental stages investigated. The specific posterior-to-anterior decaying shape of the growth gradient suggests it deriving from the linear transduction of a graded signal, similar to those commonly provided by morphogens. A growth control depending on a form of positional specification, possibly realized through the linear interpretation of a graded signal, may represent the primitive condition for arthropod differential growth along the main body axis, from which the diverse and generally more complex forms of growth control in subsequent arthropods have evolved.
- MeSH
- biologické modely * MeSH
- členovci anatomie a histologie růst a vývoj MeSH
- regresní analýza MeSH
- rozvržení tělního plánu fyziologie MeSH
- tělesné váhy a míry MeSH
- zkameněliny * MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- Research Support, U.S. Gov't, Non-P.H.S. MeSH
- srovnávací studie MeSH
- Geografické názvy
- Česká republika MeSH
An unusual combination of median nerve's variations has been encountered in a male cadaver during routine educational dissection. In particular, the median nerve was formed by five roots; three roots originated from the lateral cord of the brachial plexus joined individually the median nerve's medial root. The latter (fourth) root was united with the lateral (fifth) root of the median nerve forming the median nerve distally in the upper arm and not the axilla as usually. In addition, the median nerve was situated medial to the brachial artery. We review comprehensively the relevant variants, their embryologic development and their potential clinical applications.
- MeSH
- arteria brachialis abnormality MeSH
- disekce MeSH
- kosterní svaly inervace MeSH
- lidé MeSH
- mrtvola MeSH
- nervus medianus abnormality MeSH
- plexus brachialis abnormality MeSH
- předloktí inervace MeSH
- senioři MeSH
- Check Tag
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- Publikační typ
- časopisecké články MeSH
- kazuistiky MeSH
464 s. : il.
- MeSH
- sociologie MeSH
- statistika jako téma MeSH
- ukazatele zdravotního stavu MeSH
- zdraví rodiny MeSH
- Geografické názvy
- Britská Kolumbie MeSH
- Egypt MeSH
- Pákistán MeSH
- Sýrie MeSH
- Konspekt
- Psychologie
- NLK Obory
- psychologie, klinická psychologie
- veřejné zdravotnictví
- sociologie
- NLK Publikační typ
- publikace WHO
VIII, 738 s. : bar.fot., obr., tab., grafy ; 32 cm
- Klíčová slova
- Diagnostika, Onkologie,
- MeSH
- diagnóza MeSH
- histologické techniky MeSH
- nádory podle histologického typu MeSH
- nádory patologie MeSH
- Konspekt
- Patologie. Klinická medicína
- NLK Obory
- onkologie
- patologie
