2 ANÁLISIS DEL MEDIO AMBIENTE
2.4 ANÁLISIS DEL SECTOR
2.4.2 ESTRUCTURA GENERAL DEL SECTOR DE LA PAPA
on tlAQ typo of tissue source* \ . jyy '
■ % ' y.' -...- .'y '
"
. ; "'.' Intra period bauds, that - is basidiug_. within• the 640X
• ■periodt wore first described by Xfolpsrs (lp44)# This author
'' found; two' .or. Wrbe. bzmdSy
W .d ' a sfurtlior; wo%4t-:'.was ' carried - o u t '
Schmitt, nail and jâkûs (1945) described five and ilofmanu,
, Hoïü'tschêk'and'Orasamatm ( 1952} described ton* Thè bauds
'a%)pcarcd\ to'- hày'ô-'a kf ixbdyiutra period ''pboitlou : axid - density .'-of;
nhosphôtun^stic acid ' a tainiufj* ', Woipcrs • (1950 ) oacpr'ossod ; tho '. y
■■' view .that'-'a normal !nature oolla^;on fibril had only ;two. iutra.y, -
period bands and tho laresènco of W r ç bauds' was, indication of
y pat’holo/jical cluxiiije*' However this . view is ' no loiwjer ' hold ami ,.'
the . typical ' cqlla^on - fibril slçctrbn .micrograph, found with
'•
positivé %)hosphotuuf;stic acid etalmlng '(pîl 4.2) is shotni in ' '' y
.'Plate. Z. y.
'x' .y -
-
/ -/
y -
. -'y^yZtyhas .bo'cn su^x^estcd t3mt\,-tho oblla($qa . fibril .hus^â
y /' \
thô contrai oorc being packed with mucopoiy&aooh&rido* Smith,' and Serafini"^Fracaa6iai (1967) have propoood a tubular
n " '■ • ■ ^ ■ 'ÿ-' ■ •• : ■■ '
fibril or
5
OA diamotcr as a basic building unit of the larger fibrils. Staining with .blomuth indioatod that there wore no sulphatod muoopblyoAOCharidoo prosout in these fibrils.Schmitt, Groae.,and llighborgor in 1955 dlootiasad the three forms of oollagen arising from a etudy of soluble
fractions in both acid and alkali and the factors oonoernod with precipitation of fibrils, by dialysis, salt oonoêntration
• . . .
and mucopolysaccharidoa* Three forms of proolpitatod Collagen
ware noted. ' , - - ■ , . ■ .
(
1
) The standard fibrous collagen, which ha» thecharaq t or is tic 64o£ spacing when » stained V-.withphosphtimgs tic •' a d d and viewed in the pXoofcron wlcroscopo* ,
(g) The f ibroua long spacing type (F. L# S.* )/which,.was produced by precipitation with glycoprotoin (Kighbcrger j*t d . ,
1951
)♦ Other agents wore found to produce this typo, for •: v: \ 3' " /
instance, chomlroitln sulphate, thrombin and heparin (Randall, Framer, Pi11on#*Jackson, Martin and North 195^0 •
(3 ) The segwcnt lohg opacing typo (s.L.B.) producf^d by precipitation with adeuoeino triphosphate (atp). (Sohmltt, Gi'oss and highborgcr, 1953)» The three typos ai'o shown in Plato X»
■ Those studios indicatod the oomplcxity of collagen wit regard to ordered "crystallino" structures in vitro, Ramsey
PMÏE I :
io n ?qrriB
of
C o lla g en'-scon unde r th e R lo c tr on. nioix)boopb ' /.:'op; khe n a tiv e typ o ( n o s itiv e .HiA s ta in in g ^ pH .
4
.2
). . ■'. -,://
C entre: Begrient - lo n g • spacing:' )' ty p e : (IFA 3tàin:uig>-, pH •, , -"
a , a , b , c , d e ,
*
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