摘要:

The literature on the coccidia of the carnivorous mammals of the family Mustelidae has been reviewed. Three species ofIsosporaare described for the first time from the zoriile,Ictcnyx (Zorilla) capensis(Fam.Mustelidae). Two of these,I. hoogstraalisp. now, and 7.africanasp. nov are considered to be new species, while the third one, I.bigeminavar.zorillaevar. nov. is recognized as a new variety.

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01180.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

In three Patagonian cavies (Dolichotis Patagonia) which died in Dutch zoological gardens, coccidia were found. They were determined asEimeria dolichotis(Morini Boero&Rodriguez, 1955). Cross‐infection experiments with guinea‐pigs exclude the identity withEimenc cmv

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01181.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Most of the thigmotrichous ciliates of the family Ancistrocomidae are parasites of gastropod and pelecypod mollusks. The only known exceptions areHypocomella pho‐ronopsidis, from a phoronid, and some species ofHypocomellaandHeterocinetopsiswhich parasitize the oligochaeteChaeto‐gaster limnaeias well as certain of the fresh‐water snails with which this worm is commensal. Two new species of marine ancistrocomids, found on the Pacific coast of Oregon, infect hosts belonging to groups from which ciliates of this type have not previously been reported.Hypocomella katharinaesp. Now is a parasite of the ctenidial epithelium of the chitonKatharina tunicata. Ignotocoma sabellarumgen. nov., sp. nov., is found on the peristomial cirri of two polychaete annelids of the family Sabellidae:Schizobranchia insignisandEudistylia polymorpha. The genusIgnotocomadiffers from previously described genera of ancistrocomids in having its ciliary system separated into two fields, each consisting of seven or eight rows, which are largely limited to weakly concave areas lying on opposite sides of a longitudinal ridge‐like eminence on the inferior

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01182.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Disematostoma colpidioidesvon Gelei, 1954, is a Peniculina which stands out principally by a very markedly‐twisted shape, resulting from the allometric growth of some of the right somatic kineties, and by the sigmoid curvature of the postoral suture. During the fission of the macronucleus, it is possible to observe the expulsion of a small chromatic mass which degenerates quickly. A part of the buccal apparatus undergoes a dedifferentiation during the encystment, so that the three “peniculi” disappear while the vestibulary kineties pe

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01183.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The effect of a series of phenylalanine‐ or tyro‐sine‐containing peptides and derivatives on the oxygen consumption of washedTetrahymena performersW cells was determined. Peptides gave greater stimulation of oxygen uptake than phenylalanine or tyrosine alone. Intermediary reaction products of phenylalanine metabolism were not oxidized, nor were derivatives of phenylalanine in which the amino group was blocked. The action of several tyrosine or phenylalanine ant metabolites was determined. It was demonstrated that extra‐cellular hydrolysis of glycyl‐L‐phenylalanine and alanyl‐L‐phenylalanine took place when these peptides were incubated with

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01184.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Electron micrographs of sections through the blepharoplast complex reveal it to be composed of four kineto‐somes. In many of the sections the kinetosomes contain dense particles approximately 180‐200 A in diameter. The costa is a striated fiber which extends posteriorly almost the entire length of the body. Its slender proximal portion appears to be attached to the base of the kinetosome of the recurrent flagellum. The parabolas fiber is similarly constructed, but is more slender than the costa. It is attached to the base of the kinetosome of an interiorly directed flagellum and subsequently proceeds posteriorly to the level of the nucleus. The costa and parabasal fiber probably serve as anchoring or supportive structures. The size of the costa may reflect its role as a supporting structure for the most highly differentiated locomotors organelle, the undulating membr

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01185.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Application of fragmentation and thin‐sectioning techniques toTetrakymena pyriformis, Colpidium compilesandGlaucoma chattonihas permitted an analysis of the ultra‐structure of their silverline and fibrillar systems. The classical silverline system consists of a mosaic of flat, membrane‐bound blisters whose rims represent the sites of selective silver deposition. Cilia and protrichocysts emerge between adjacent blisters. I The pellicle consists of the membranes outlining the blisters, overlain by a continuous outer membrane that covers the whole cell and cilia. Fibrillar structures, which are not argentophilic, include: (1) tapering, striated kinetodesmal fibers arising singly from the kinetosomes, passing to the right and anteriad, and overlapping to form a loose bundle accompanying each kinety; (2) a longitudinal fibril band immediately beneath the pellicle at the right of each kinety, consisting of overlapping individual fibrils; (3) a transverse band of fibrils arising at the left side of each kinetosome and passing to the left under the pellicle; and (4) a set of postciliary fibrils arising at the right posterior edge of each kinetosome and passing posteriad under the pellicle. The fibrils of sets (2), (3), and (4) all are about 20 Mμ in diameter and appear tubular in cross‐section; they are very unlike the heavier, solid kinetodesmal fibers. None of the fibril sets directly interconnect, although transverse and postciliary fibrils end in the vicinity of the longitudinal fib

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01186.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Bleaching (interference with chlorophyll accumulation) by streptomycin (SM) is more effective when dark‐grownEuglena graciliscells are exposed to SM in the dark for several days than when exposure of dark‐ or light‐grown cells is exclusively in light. Cells are also bleached when exposed to SM while lacking both chlorophyll and chloroplasts (i.e., exposed to SM in the dark and subcultured to SM‐free medium before transfer to light). Bleaching therefore involves inhibition of the formation of a plastid or pigment precursor, rather than breakdown of chlorophyll or interference with replication of mature chloroplasts. Bleaching by SM B prevented by addition to the medium of any of several fin cations, including Mg. Therefore it is proposed that bleaching results from chelation of Mg by SM. thus blocking a Mg‐requiring step in chlorophyll synthesis. Disruption by SM of chloroplast structure and/or development is considered a secondary consequence of the bleaching action, resulting from the essentiality of intact chlorophyll molecules for normal chloroplast

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01187.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The slime moldFuligo septicahas been grown bacteria‐free in a pure 1.5% agar and oats at a temperature of 25°C. The Plasmodium was also grown under wat

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01188.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The structure of a cilium inNyctotherus ovalisis that usually found: two single central filaments surrounded peripherally by nine double filaments; the whole is encased in a ciliary membrane continuous with the pellicle. The two central filaments end in a single enlarged bulb just above a septum, located at about the level of the pellicle, whereas the nine double filaments extend inward to form the cylindrical basal body, which is open at its inner end. Inside the basal body are granules àrranged in rows parallel to its sides. These granules may have significance in the origin of new basal bodies as well as in the outgrowth of new cilia. The latter may have been observed in a few instances. Parallel to the pellicle are two series of fibrils, one median and one inner, connecting adjacent basal bodies. Fibrils extend from the inner end of each basal body, these converge and extend deep into the ectoplasm, often becoming lost in a pattern of equilateral triangles, arranged to form hexagons. These features are clearly seen in the peristomial membranelles, where the basal bodies of the four rows of cilia are close together, separated from adjacent membranelles by a protoplasmic shelf and supported by a mass of fibrillar material comprising the peristomial ectoplasmic band. This broad band extends to the inner end of the peristome whence it returns along the opposite wall as a narrow mass of fibrillar ectoplasm without basal bodies. Peripherally the fibrils are condensed into fan‐like bundles; internally they often form a network of equilateral triangles arranged to form hexagons, with corpuscles at the intersections. Trichite‐like structures are also found in the peristomial groove and tube; these are connected to both the basal bodies and the fibrillar network.The functions, origin and development of this complex infraciliature during fission constitute one of the yet unsolved morphological problems in such complex cili

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1961.tb01189.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY