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: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: En este trabajo se hace un estudio anatómico comparado de las vías biliares de varias especies animales provistas de vesícula y carentes de ella tratando de aclarar su significado funcional y las posibles razones de su ausencia. Se discuten las distintas hipótesis existentes al respecto.Los autores concluyen que la función de la vesícula biliar está relacionada con la presión de la bills y es consecuencia de la orientación de las vías biliares en el espacio, es decir, en relación con la acción de la gravedad, puesto que, dentro de las especies consideradas, las vías biliares de las que no presentan vesícula tienen una orientación descendente, mientras que es ascendente en las que la poseen.〈section xml:id="abs1-2"〉〈title type="main"〉ZusammenfassungDie funktionelle Bedeutung der GallenblaseVorliegende Arbeit ist eine vergleichend-anatomische Studie der Gallenwege von Tierarten mit und ohne Gallenblase, die versucht, die funktionelle Bedeutung derselben und die möglichen Gründe für ihr Fehlen aufzuklären. Die verschiedenen Hypothesen, die diesbezüglich im Schrifttum existieren, werden diskutiert.Die Autoren gelangten zu dem Schluß, daß die Funktion der Gallenblase in Zusammenhang mit dem Gallendruck steht und eine Folge der Orientierung der Gallenwege im Raum ist, das heißt von der Schwerkraft abhängt. Bei den untersuchten Tierarten zeigte es sich nämlich, daß dort, wo die Gallenblase fehlt, die Gallenwege eine absteigende Richtung aufweisen; wo die Gallenwege dagegen aufsteigen, ist audi eine Gallenblase vorhanden.〈section xml:id="abs1-3"〉〈title type="main"〉SummaryThe functional significance of the gall bladderThis is a comparative anatomical study of the bile duct system in animals with and without a gall bladder. The attempt was made to determine the functional significance of the gall bladder and to discover the possible reason for its absence in some species. The various theories for the lack of a gall bladder extant in the literature are discussed.The authors believe that the function of the gall bladder is related to the pressure of the bile resulting from the orientation of the bile duct system in space, i. e., it is related to the gravity of the bile. It could be shown that, in the species examined, in those without a gall bladder the bile duct had a descending (in relation to the earth's surface) direction, while in species with an ascending bile duct a gall bladder was present.〈section xml:id="abs1-4"〉〈title type="main"〉RésuméSur la signification fonctionnelle de la vesicule biliaireLe présent travail constitue une recherche ďanatomie comparative sur les voies biliaires de plusieurs espéaces animales pourvues ou non de véasicule, dans le but ďexpliquer la signification fonctionnelle de celleci et les raisons possibles de son absence. Les différentes hypotheses, formulées dans la literature á ce sujet, sont discutées.Les auteurs en concluent que la fonction de la vésicule est en rapport avec la pression de la bile, résultant de ľorientation spatiale des voies biliaires, et depend en définitive de lcar;action de la pesanteur. On constate en effet, dans les espéces étudiées, que la vésicule biliaire manque lorsque les voies biliaires ont une direction descendante et qu'elle est présente lorsque ces mêmes voies ont un trajet ascendant.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1573-0832
    Keywords: Mycelial conidia ; Paracoccidioides brasiliensis ; scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The conidia produced by the mycelial form of Paracoccidioides brasiliensis were examined by scanning electron microscopy for the first time. Several different conidial types were characterized. These included intercalary arthroconidia, several types of septate conidia that are formed from other conidia, pedunculate conidia, and terminal hyphal conidia. In addition, the ultrastructure of the supporting pedestal of the pedunculate conidium was found to be separated from the mother conidium by a septum in some instances, and at other times it was not.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1573-0832
    Keywords: Paracoccidioidomycosis ; mycelium ; conidia ; ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The ultrastructure of asexual spores (conidia) produced by the mycelial form of Paracoccidioides brasiliensis was studied for the first time with transmission electron microscopy, using thin sections of aldehyde-osmium-fixed and epoxy-resin-embedded samples. The various types of conidia observed in the sections correlated well with previous light-microscopic descriptions. These types were intercalary or apical conidia, depending on their location along the originating hyphae. As in previous studies they were characterized as arthroconidia, aleuriospores and sessile or pedunculate pyriform conidia. The sporogenous cells were clearly distinguished from hyphal cells by the thickness and appearance of their cell walls. Copious fibrillar material (glycocalyx) detected at the cell surface was stained with ruthenium red during the fixation process. Typical subcellular organelles (nucleus, nucleolus, mitochondria, ribosomes, etc) were found in most of the sections. It was concluded that the spores produced by the mycelial phase of P. brasiliensis possess all attributes of viable and physiologically competent eukaryotic cells.
    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...