ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03244.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SYNOPSIS.Eimeria bandipurensisn. sp., is described from the gut of an Indian palm squirrel,Funumbulus palmarum, obtained from a village, Bandipur, in West Bengal. Spherical and egg‐shaped oocysts were encountered, the former averaging 17 μ in diameter and the latter 18 by 16 μ. Oocystic residuum was absent while the sporocystic residuum was represented by refractile globules. A Stieda body was present in the sporocyst. Sporozoites were banana‐shaped with one end broader and the other pointed with a clear globule at eac

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03245.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SYNOPSIS.Plasmodium fischerin. sp. is described from the blood ofChamaeleo fischeritaken along the edge of the rain forest at Amani, Tanganyika. This parasite differs fromP. acuminatumpreviously described from this host in the same area.P. fischerican maintain a parasitemia for over a year in this host. No exoerythrocytic stages were seen. Both plasmodia have a very limited geographical distribution. Attempts to find a possible arthropod vector by exposing chameleons in an insect trap in the endemic area were unsuccessful.

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03246.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SYNOPSIS. With the technique of preselecting pure suspensions of trypanosomes for subsequent electron microscopy and with epoxy resin embedding after glutaraldehyde fixation, we have re‐examined the ultrastructure ofTrypanosoma lewisiwith particular reference to the flagellum and pellicle. The peripheral flagellar tubules exhibit clockwise asymmetry; however, sub‐tubule B of the peripheral tubules is divided into a doublet by a diagonally running anti‐clockwise arm that originates from the median diaphragm. Projections which seem to be continuous with the counter‐clockwise arms extend into a “basket shaped” intra‐flagellar structure. This structure, originating distal to the flagellar pocket and running anteriorly within the flagellar membrane, may play a role in maintaining the rigidity of the flagellum.The central flagellar tubules have a double helical substructure and dense cross‐striae (diameter 50 Å), and are regularly arranged at distances of approximately 250 Å. The central tubules arise from separate kinetosomal plates that lie at two different elevations. One central flagellar tubule originates from a flattened kinetosomal plate which makes contact with the peripheral tubules. The other central tubule passes through the flattened plate to fuse with an underlying “disc‐like” plate.The primary kinetosome exhibits the uniform triplet pattern of tubules at its most proximal region. A pair of tubules closely associated with one of the triplets represents two of the four subpellicular tubules which penetrate the cytoplasm in the region of the flagellar pocket. Sub‐pellicular tubules of dimensions similar to the flagellar tubules form a uniform cytoskeleton in all regions of the cell except in the area of the flagellar pocket.A desmosome‐like structure maintains continual cell membrane contact with the flagellum and the pellicle. This structure is designated the attachment zone. The fine structure of the kinetoplast is demonstrated. The dense intra‐mitochondrial elements (presumably containing DNA) are actually tubules, embedded in a moderately dense matrix. Morphological observations indicate that this organelle is probably primarily concerned with the ontogenesis of mitochondria, and several mitochondria extend from it i

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03247.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SYNOPSIS. Nutritional and cultural factors influenced growth ofChlamydomonas mundanaat different H‐ion concentrations. Growth at acid pH (5.5–6.0) primarily depended on the acetate and chelated iron concentration and on the method of preparation of the medium. The organism had increased Na, Ca, and Mn requirements at an acid pH. Sensitivity to increased levels of phosphate was greater at low than at high pH. The requirement for chelated as compared with non‐chelated Fe was qualitatively easier to demonstrate at low pH. The procedure followed in preparing the growth media was more important with higher levels of chelator and Fe and with media of low pH. All 6 synthetic chelators studied were more effective, as measured by growth, if combined with iron before addition to the media. At high pH (7.0–7.5), the organism was much more adept at utilizing over‐chelated Fe. This latter finding, and the greater sensitivity at low pH to trace‐metal imbalance in ill‐prepared media, indicate that the organism absorbs Fe much more efficiently at neutral or slightl

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03248.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SYNOPSIS. The incorporation of H3‐uridine during the pretransition period of heat‐synchronized cells ofTetrahymena pyriformisoccurs in two peaks, one at 20 and the other at approximately 40 min following the end of the last synchronizing heat treatment (EH). Although Actinomycin D tends to produce substantial inhibition of both peaks it has a significant effect on cell division only if applied before or during the first peak of incorporation. It appears that the production of new RNA is required for the first synchronous division and that it is synchronized with the division process. Actinomycin D seems to increase, slightly, the degree of incorporation of H3‐uridine into RNA when applied at 0 and 10 min past EH. This effect may be correlated with the positive excess delays of division which result when cells are exposed to the inhibitor at these times. A similar effect of Actinomycin on incorporation at 30 or 40 minutes past EH, however, does not appear to be associated with any strong effects of the inhibitor on div

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03249.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SYNOPSIS. Three stock cultures ofE. histolytica, strains 200, K9, and 22, have each been shown by microisolation methods to consist of at least two substrains or variants differing in size. Cultures were grown withTrypanosoma cruziin Phillips medium, and on egg slants with mixed bacteria and a single species of bacteria. For each strain, the variant that was bigger in one medium was also bigger in the other two media, in spite of the fact that absolute sizes changed greatly depending upon the medium. This shows that size patterns were primarily determined by endogenous factors, although absolute size was strongly influenced by the culture medium. In all cases the small variants remained larger thanE. hartmanni.In the initial weeks after microisolation, the variants showed consistent size patterns. After a few months, the big substrains ofE.h.K9 and 22 showed a spontaneous reduction in size, eventually becoming smaller than the corresponding small variants. The change inE.h.K9 was shown to be due to a shift in the entire population, rather than to selection of individual mutants. In theE.h.200 cultures, big and small variants retained their distinctive sizes throughout the 17 months during which they were observed.

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03250.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SYNOPSIS.Heliochona psychran. sp. (Ciliata: Chonotrichi‐da), an ectocommensal on the pleopodal bristles ofGammarus setosaDementieva from Nuwuk Lake, a marine halocline lake at Point Barrow, Alaska is described.H. psychradiffers from the older speciesH. scheuteniiStein andH. sessilisPlate in its size, outline of the cytosome, and appearance of the funnel ray

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03251.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SYNOPSIS. The ciliate,Paranophrys marinan. g., n. sp., is described from a marine hydroid,Plumulariasp., collected in the San Juan Archipelago, Washington. Morphological studies were made on specimens treated with the Chatton‐Lwoff silver impregnation technique. Particular attention is given to the infraciliature of the buccal apparatus and its importance in generic and familial assignment within the order HYMENOSTOMATID

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03252.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SYNOPSIS.Globigerina bulloidesandGlobigerinoides ruber, two pelagic foraminifera from the North Atlantic, were fixed in modified Zenker or Bouin solutions directly after collection and studied cytochemically. They have two unusual organelles: a vesicular system and an organelle provisionally named a “cryptosome.” The vesicular system occurs chiefly in the newest formed chambers and consists of a pair of intertwined tubules with helical fine structure which terminate in a bouquet of approximately 20 vesicles or loops. The function of this system is unknown. The detailed morphology of the vesicular system is different in each species. The cryptosome is a structure which varies greatly in its morphology. It is better developed inG. bulloidesthan it is inG. ruber.At times a cryptosome may occupy up to 2/3 of the protoplasm of a chamber. In Himes‐Moriber‐stained preparations crypto‐somes stain with naphthol yellow S and contain within them an azure A‐Schiff staining spongy reticulum. Both of the pelagic foraminifera studied are heterokaryotic. Agamonts ofG. rubermay have a graded series of nuclear sizes but those ofG. bulloidestypically have a single somatic nucleus. The zooxanthellae ofG. ruberare similar toSymbiodinium microadriaticumand may collectively occupy almost 4/5 the volume o

ISSN:0022-3921    

DOI:10.1111/j.1550-7408.1965.tb03253.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY