摘要:

Synopsis.The cortical anatomy and morphogenesis ofCladotricha koltzowiiGajewskaja andCladotricha variabilisRumen from the Great Salt Lake, Utah, are described. When compared with 2 marine hypotrichs,Uroleptoides kihniWenzel andStichotricha secundaKahl, from the east coast of the United States, their structure and development suggest thatCladotrichamay have descended from an intermediate species within the line of evolution of the Spirofilidae from primitiveKahliella‐like hypotrichs. It is suggested that theKahliella‐Cladotricha‐Uroleptoidesseries is separated at the familial level from both the tubicolous and planktonic spirofilids. Further, the structural and morphogenetic differences betweenCladotrichaand the holostichidUroleptusappear to be at a subordinal level. These findings are significant in revising definitions of the Hypotrichida, its suborders, and the Urosty

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02731.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SYNOPSIS.A scanning electron microscope (SEM) study ofHypotrichomonas acosta(Moskowitz),Trichomonas vaginalisDonné.Pentatrichomonas hominis(Davaine), andTritrichomonas foetus(Riedmüller) provided new information about the structure of the periflagellar canal: emergence of the flagella from the cell body; structure of the undulating membrane; and position, shape, and size of the pelta. Of special interest were the spatial relationships of the attached part of the recurrent flagellum and the accessory filament inHypotrichomonas and in the members of Trichomonadinae, i.e. TrichomonasandPentatrichomona

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02732.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SYNOPSIS.The occurrence of conjugation in the flagellate,Polytomella agilisAragão, as first reported in 1910, is confirmed. The gametes made contact with each other in a variety of positions. Our observations differ in minor ways from those reported forP. agilisand are in considerable disagreement with others published on sexual reproduction inPolytomella caeca

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02733.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SYNOPSIS.Under the growth conditions employed, the G1macronucleus ofTetrahymena pyriformisHSM contains 7.4 × 10‐12g DNA, the G2micronucleus 0.42 × 10‐12g. DNA content from theTetrahymena thermophilamacronucleus did not significantly differ from that of HSM, but the micronucleus contained about twice as much DNA as the micronucleus of the HSM cells. TheT. thermophilamacronucleus contained on average enough DNA for ˜ 35 haploid micronuclear copies. A new spreading technic allowed separation of macronuclear substructures from cells of late G2to early G1. Photometric determination of DNA content of 345 individual structures suggested the existence of 5 different‐sized macronuclear structures with a DNA content corresponding to 2, 4, 8, and 16 × the basic values. Comparison of the DNA content of these structures with (a) mitotic micronuclear chromosomes and (b) meiotic micronuclear chromosomes ofT. thermophilacells suggests that the 5 basic values of macronuclear structures derive from structures of micronuclear chromosomes. The micronuclear chromosomes ofT. pyriformismay be oligotenic. It is suggested that these results further our understanding of macronuclear org

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02734.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Book reviews in this article:Regan, M. A.&Chapman, D. J. 1978.A Biochemical Phylogeny of the Protists.

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02735.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Resume.Une analyse des séquences morphogénétiques du CiliéTetrahymena paravoraxmontre que: (A) La durée de la stomatogenèse de bipartition des formes microstomes en croissance exponentielle représente 45% du temps de génération (stade 1—20%; stade 2—3%; stade 3—3%; stade 4—5%; stade 5—5%; stade 6—9%). (B) La division cytoplasmique est inégale (les proters sont plus petits que les opisthes); la différence de taille initiale entre les 2 produits de fission est probablement compensée par une prolongation de la période de croissance chez le proter. (C) Le pourcentage maximum de réorganisation buccale microstome → macrostome pour les populations asynchrones atteint –˜ 70% au bout de 210 mn d'incubation dans la stomatine. (D) L'initiation de la stomatogenèse de remplacement oral est connectée avec la fin d'une période dont la durée minimale est approximativement celle du stade 0 du cycle normal d'interdivision des microstomes; cette initiation est retardée chez les microstomes exposés à la stomatine dès le début du cycle cellulaire. (E) Le primordium buccal de division peut se résorber en présence de stomatine et la stomatogenèse antérieure peut commencer avant que ne soit terminée cette résorption; la résorption n'est plus induite au‐delà d'un point du stade 5 qui précède le début de la constriction du corps cellulaire.SYNOPSIS.An analysis of the morphogenetic sequences in the ciliateTetrahymena paravoraxhas shown that: (A) The duration of predivision stomatogenesis in exponentially growing microstomes occupies 45% of the generation time (stage 1—20%; stage 2—3%; stage 3—3%; stage 4—5%; stage 5—5%; stage 6—9%). (B) Cytoplasmic division is unequal (the proters are smaller than opisthes); the initial size difference between the 2 fission products is presumably compensated by an increased growth period in the proter. (C) The maximum percentage of microstome‐to‐macrostome oral reorganization is –˜ 70% in asynchronous populations, 210 min after suspension in stomatin. (D) Initiation of oral replacement stomatogenesis is associated with the end of a period which has a minimum duration nearly equal to that of stage 0 characteristic of the normal inter‐division cycle of the microstomes; this initiation is delayed if exposure of microstomes to stomatin is begun at the onset of the cell cycle. (E) The buccal primordium formed in division can be resorbed in presence of stomatin and anterior stomatogenesis can start before the resorption is completed: this resorption is not induced if the cells have progressed be

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02736.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SYNOPSIS.InTetrahymenathermophila subline B, a morphogenic alteration of the anterior end of cells of mating types III and VII results from a cellular interaction which precedes and is a prerequisite for pairing. Cell pairing begins 1 h after starved cells of complementary mating type are mixed. The 1 h‐long lag period is characterized by an actinomycin D‐sensitive inductive interaction in the first 30 min, followed by a maturation period. Tip transformation begins during the maturation period and continues after pairing. Scanning electron microscopy of deciliated cells reveals ridges which form a chevron meeting in a midline seam between the oral apparatus and the anterior tip. During transformation, the seam broadens until the ridged surface is completely smooth. Melding of the ridges also occurs at the tip of the cell resulting in its blunted appearance. Cells of complementary mating types join in the region of this modified surface, which eventually becomes a specialized cell junction perforated by cytoplasmic bridges. Thus, pursuant to an inductive interaction the structure of the tip of cells is modified in anticipation of the pairing event. Rate of cell pairing might be limited by rate of tip transformat

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02737.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Book reviews in this article:Princibal Para‐sites of Domestic Animals i n the United States: Biological and Diagnostic InformationIvens, V. R., Mark, D. L.&Levine, N. D.Geografhic Medicine for the Practitioner. Algorithms in the Diagnosis and Management of Exotic Diseases.Warren, K. S. and Mahmoud, A. A. F., ed

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02738.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Synopsis.Structure, infraciliature, and ecology of 4 fresh‐water Tintinnina were investigated. The lorica ofTintinnidium fluviatileis gelatinous, fragile, and contains some agglutinated material mainly of biologic origin. Its infraciliature consists of ˜ 10 kineties. with kinetosomes arranged in pairs. Only one basal body of a pair is ciliated, except for the uppermost 1–4 pairs which have 2 slightly elongated cilia. InTintinnidium fluviatile. Tintinnidium pusillum, andTintinnopsis cylindratathere are 2 prominent ventral organelles. The lorica ofT. pusillumis gelatinous and coated with much agglutinated material of biologic and nonbiologic origin. Its infraciliature is similar to that ofT. fluviatile, but the uppermost pair of kinetosomes has elongated cilia. The firm loricae ofT. cylindrata and Codonella crateraare, built mainly of sharp‐cornered structures. The infraciliature ofT. cylindratais composed of ˜ 10 kineties with kinetosomes not arranged in pairs. The infraciliature ofC. crateraconsists of ˜ 32 kineties, in some of which the kinetosomes are paired, e.g. ventral kinety, and in others not paired, e.g. cilia of the very prominent lateral field and of the other somatic kineties. The uppermost kinetosomes of each somatic kinety are paired and have elongated cilia. In addition, there is an unusual ventro‐lateral kinety. The oral apparatus consists of adoral membranelles and a paroral membrane. The membranelles that enter the praecral cavity are very elongate, a feature perhaps unique to Polyhymenophora. The fibrillar system consists of a prominent praeoral ring formed by fibrils extending from the adoral membranelles. A finely meshed silverline system extends over the entire cell.A review of the ecology of the fresh‐water Tintinnina indicated that water temperature seems to be the most essential ecologic factor.The systematic position of the Tintinnina is discussed in light of their infraciliature. It is concluded that these organisms are most closely related to Oligotrichina, and probably to He

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02739.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Synopsis.Trypanosoma congolenseBroden, an intravascular parasite, binds to vessel walls and erythrocytes of infected hosts. In an attempt to characterizeT. congolenseadhesion to host cells, anin vitroassay was devised. It was shown in thein vitroexperiments thatT. congolensebinds to bovine, sheep, and goat erythrocytes, but not always to erythrocytes of rats, mice, rabbits, horses or humans. Only the anterior part of live trypanosomes adheres to erythrocytes, and the attachment site on the trypanosomes is destroyed by trypsin and chymotrypsin. Trypanosomes did not adhere to bovine erythrocytes that had been incubated with neuraminidase, sodium periodate and poly‐L‐lysine. The foregoing experiments suggest that the surface ofT. congolensecontains a protein‐associated site which binds to sialic acid of some host cells. This surface site is most likely responsible for attachment to blood vesselsin

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1979.tb02740.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY