Library

Your search history is empty.
feed icon rss

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
    Marine mammal science 15 (1999), S. 0 
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: To assess large-whale stocks following the cessation of land-based South Georgia whaling in 1965, we report three independent sighting databases: a cruise in 1997, observations from Bird Island (NW of South Georgia) between 1979 and 1998, and mariner sightings between 1992 and 1997. All species were rare, with sightings of southern right whales being the most common event. Two right whales photographed off South Georgia matched animals known from Peninsula Valdés, Argentina, a population known to be growing at 7%per annum. In contrast, blue and fin whales appeared to be less abundant. A single blue whale mother-calf pair was observed off the Shag Rocks in February 1997. Extirpation of animals from this particular feeding ground is the most likely reason for ongoing low numbers of all species. Other factors may include competition for krill by traditional predators such as penguins and seals and more recently by humans, an unusually high rate of natural mortality, habitat change such as alteration in sea ice coverage, and/or the impact of ongoing whaling. The history of this critical area of large-whale habitat and this report demonstrate the need for improved, consistent longterm monitoring of population trends for these depleted stocks.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A monospecific antibody to a plasminogen Kringle 4-binding tetramer protein of human blood, tetranectin, was applied to various human endocrine tissues employing the peroxidase-antiperoxidase staining technique. Endocrine cells with a known protein or glycoprotein hormonal production such as chromophils (pituitary), follicular and parafollicular cells (thyroid), chief cells (parathyroid), hepatocytes (liver), islet cells (pancreas) and ganglion cells of the adrenal medulla displayed a convincing, positive staining reaction for tetranectin, which varied from cell to cell within the different tissues. The liver showed a distinct and universal reaction within almost all hepatocytes, thus raising suspicion of producing the bulk of tetranectin to the blood. Tetranectin has recently been characterized as a lectin-like protein with amino acid sequence homology to the core protein of a rat chondrosarcoma proteoglycan. Proteoglycans have been demonstrated in secretory granules of rat pituitary and pancreatic islet cells, where they probably serve as modulators in hormonal production. The granular, cytoplasmic immunohistochemical localization of tetranectin demonstrated in this study combined with the fact that tetranectin is known to attach to plasminogen and promote plasminogen activation catalysed by tissue plasminogen activator suggests that this protein might have a dual function, serving both as a regulator in the seretion of certain hormones and as a participant in the regulation of the limited proteolysis, which is considered important for the activation of prohormones.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Histochemistry and cell biology 77 (1983), S. 395-403 
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The presence and localization of fibronectin in normal and mechanically injured aorta in rabbits was studied using an indirect immunoperoxidase technique on tissue specimens fixed in formaldehyde, embedded in paraffin and pretreated with pepsin. The effect on staining quality of treatment with testicular hyaluronidase prior to immunoperoxidase staining was also examined. In the intima from normal aorta fibronectin was present in the subendothelial basal layer, along the internal and external elastic laminae, around and between the smooth muscle cells of the media and along the collagen and elastic fibres in the adventitia. Sixteen days after a single mechanical dilatation of the descending thoracic aorta all animals developed gross atherosclerotic-like changes. Microscopic examination revealed prominent neo-intimal hyperplasia with subendothelial, cushion-like thickenings but no medial or adventitial alterations. Fibronectin, in increased amounts, was found between and around the endothelial cells and in the subendothelial thickenings between the proliferating smooth muscle cells in relation to the fine, thin elastic and argyrophilic fibres. In the media and adventitia the amount and distribution of fibronectin was indistinguishable from uninjured control aortas. Treatment with testicular hyaluronidase before immunoperoxidase staining resulted in a higher staining resolution in normal and injured aorta. The conspicuous observation in the present study is that fibronectin exclusively accumulates in areas of tissue repair. The origins and functions of fibronectin during tissue injury and repair are discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...