Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. A chemically defined culture medium has been developed for the soil amoeba Hartmannella rhysodes Singh which contains the minimum essential organic requirements for growth. The medium consists of 7 amino acids, 3 vitamins, a carbon source (e.g. glucose) and inorganic salts.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Cysts of the hypotrichous ciliate Pleurotricha lanceolata were placed in dilute aqueous solutions of specific chemicals (carbohydrates, vitamins, L-amino acids, nucleic acids and derivatives, other organic acids and tweens) to assay the effectiveness of these chemicals as excysting agents. It was found that some of the amino acids, deoxyribonucleic acid, ribonucleic acid, and some other organic acids induce excystment at rates equal to or better than the control medium, 0.05% (w/v) aqueous lettuce extract. Preliminary experiments with chelating agents, tri- and tetra-sodium salts of ethylenediaminetetraacetic acid (Versenol 120 and Versene 100), indicate that they successfully initiate excystment, but support it inadequately thereafter so that most of the organisms die within the endocyst.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Chilomonas paramecium has been studied by light and electron microscopy with special attention to the so-called trichocysts. The electron miscroscope reveals that the anatomy of these bodies is unlike that of the classical trichocysts of ciliates. Since these structures can be extruded from the body of the organism they have been called ejectisomes. The ejectisomes have a regular geometrical shape and a complex internal structure. They consist of two unequal components which are enclosed by a thin membrane. Morphological polarity is established by an anterior smaller unit and a posterior larger unit. When the ejectisomes are found in the peripheral cytoplasm or in a perivestibular position the smaller unit is always oriented toward the surface. A suggestion is made that the ejectisomes are derived from the vesicular component of the Golgi complex. An interpretation is offered concerning a mechanism by which ejectisomes may be extruded from the body.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. A new species of avian malaria parasite is described, for which the name Plasmodium formosanum is proposed. It was observed in the blood of Arboriphila crudigularis, the Formosan hill partridge; other bird species in which it may occur remain unknown, as do the mosquito vectors. It produces very broad, elongate gametocytes, the macrogametocyte usually exhibiting a very large vacuole. The usual number of merozoites is eight. The host cell nucleus typically is not displaced, except laterally by the sexual forms. Only the stages occurring in the blood have yet been seen.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. A mutant strain of Astasia longa utilized glucose for growth whereas the parent (J) strain did not. The optimal pH for growth of the mutant with glucose (sole carbon source) was near neutrality; the optimal glucose concentration 0.02 M. Cell-free extracts or cell homogenates produced C14O2 when incubated in the presence of C14-labeled glucose. On the other hand, after incubation with C14-labeled glucose, intact parent cells and their respiratory CO2 showed no radioactivity while the mutant-strain cells and CO2 produced were active. Dissimilation of glucose-1-C14 and glucose-6-C14 yielded the same amount of radioactivity in metabolic CO2 in cell-free extracts of both strains. Of five enzymes assayed, hexokinase, phosphoglucomutase, and lactic dehydrogenase were present whereas glucose-6-PO4 dehydrogenase and glucose dehydrogenase were absent in cell homogenates of both strains. Presumably these two strains of A. longa differ in permeability of the plasma membrane. Further tracer and enzyme studies indicated that the Embden-Meyerhof scheme is the principal pathway of glucose catabolism; the hexose mono-phosphate shunt and the direct oxidative pathway were either not operating or quantitatively insignificant.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Examination of the crop, gizzard, and intestinal contents of chickens fed suspensions of either Eimeria acervulina or E. tenella oocysts and turkeys fed either E. meleagrimitis or E. gallopavonis oocysts indicated that, in all 4 species, (1) oocysts apparently remained unchanged while in the crop, (2) sporocysts were liberated from oocysts while the latter were passing through the gizzard, (3) sporozoites were activated and escaped from liberated sporocysts after they had reached the small intestine, and (4) sporozoites within intact oocysts in the crop, gizzard, and intestines were not activated. In vitro, trypsin 1–300 alone caused a small percentage of sporozoites to excyst from mechanically liberated sporocysts. The percentage of excystation increased greatly when trypsin was added to sodium taurocholate and increased even more when it was combined with chicken or turkey bile.The two duodenal species (E. acervulina and E. meleagrimitis) differed both in vivo and in vitro from the two cecal species (E. tenella and E. gallopavonis). The duodenal species excysted in less time and farther anteriorly in the small intestine than did the cecal species. In addition, sporozoites of the two cecal species survived much longer in media containing trypsin plus bile or sodium taurccholate than did those of the two duodenal species.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Dividing forms of Trypanosoma simiae and T. congolense in stained thin blood films taken from pigs infected by wild Glossina morsitans submorsitans were measured employing a technique which took account of the distance between the divided kinetoplasts, the positions of the nucleus or nuclei and the lengths of the original and developing flagella.Analysis of these measurements showed that binary fission in these trypanosomes consisted of a gradual increase in the distance between the divided kinetoplasts along the long axis of the body; progressive outgrowth of a daughter flagellum from the blepharoplast associated with the posteriorly placed kinetoplast; migration of the nucleus toward the posterior end of the body; separation of the divided nuclei in the direction of the long axis of the body; and fission of the cytoplasm in an antero-posterior direction and finally separation into two individuals by a stepped, sliding motion.No evidence to support syngamy or other type of germ cell reproduction was observed.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Comparison of dimensional and other morphological details of adult suctorians recovered from the gills of five genera of fish from five widely separated localities in North America indicates that the practice of identifying a distinct suctorian species based upon the species of fish with which it is symbiotic is unfounded. Conversely, identification of suctorian species based on their adult morphology alone under certain conditions is justified. An emended diagnosis of Trichophyra piscium Bütschli, 1889, is presented. The pigment in T. piscium recovered from Oncorhynchus nerka (sockeye salmon) was characterized as melanin and its significance to the suctorians is discussed.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. An isosporan morphologically identical to Isospora crotali (Triffitt), 1925, was found in fecal material from one of six Florida diamond-back rattlesnakes, Crotalus adamanteus. It is the only coccidian parasite found in a survey of over 200 feral snakes, including individuals from 4 families, 43 genera and 65 species. The endozoic sexual phases of the life-cycle occur in the epithelial cells of the jejunum of the snake, as does formation of oocyst and sporocyst. Sporozoite formation occurs ectozoically, the sporulation time being 17 hr from onset of sporoplasmic fission, with a range of 13 hr. A survey of the literature indicates that I. crotali is probably the same species as the later described I. dirumpens Hoare, 1933, which has a widespread geographic distribution in diverse species of snakes. Other organisms probably synonymous with I. crotali include I. fragilis, I. laverani, I. lenti, and I. naiae. Reports of isosporan infections in snakes are few, particularly in the feral animals.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. The “Laredo strain” of Entamoeba histolytica has been reported to have different temperature requirements for growth than the usually known strains of the species, although morphological and antigenic tests have thus far indicated no significant recognizable differences. Further genetic studies show the Laredo strain to exhibit at least four characteristics different from the usual. Also, a freshly isolated strain (BA) was shown to have the same characteristics as those previously reported for some well-known strains.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...