Akuter Keratoconus

Fanta, H.

doi:10.1007/978-3-642-86006-5_10

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…The classic graft rejection process, for example, involves a lymphocytemediated destruction of the epithelial basement membrane, which may increase the likelihood of breaks in Bowman membrane 32 -a feature that has been identified in many studies as a sign of recurrence of KC. [5][6][7][8][9][10][11][12][13][14][15][16][17] This current study did find a greater likelihood of astigmatism in grafts originally transplanted for KC. However, most grafts are known to change in thickness after PKP together with a proportional decrease in endothelial cell density.…”

Section: Discussionmentioning

confidence: 92%

“…7 However, in most previous reports of KC recurrence, the precise etiology is unclear. 5,6,[8][9][10][12][13][14][15][16][17] Important limitations of this study involve the experimental methodology. Despite our best efforts, artifacts of section processing and montaging may influence the measurements obtained.…”

Section: Discussionmentioning

confidence: 99%

“…1,4 Since 1972, there have been a series of case reports in the literature of the reappearance of the signs of KC pathology in the grafts of patients whose corneas were originally KC. [5][6][7][8][9][10][11][12][13][14][15][16][17] In these studies, there has been a speculation as to whether the reoccurring KC-like pathology is because of disease spread from the host tissue, undiagnosed KC in the donor tissue, or new pathogenesis in the graft. Additionally, there have been a number of retrospective studies searching unsuccessfully for signs of recurrence in PKP patients originally grafted for KC.…”

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confidence: 99%

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Recurrence of Keratoconic Pathology in Penetrating Keratoplasty Buttons Originally Transplanted for Keratoconus

Brookes

Niederer

Hickey

et al. 2009

Cornea

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Recurrence of Keratoconic Pathology in Penetrating Keratoplasty Buttons Originally Transplanted for Keratoconus

Brookes

Niederer

Hickey

et al. 2009

Cornea

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“…It is not unusual in lattice, macular, or granular dystrophy for abnormal host factors to affect donor tissue, resulting in a recurrence of the original pathology. 6 Penetrating keratoplasty has been the treatment of choice for advanced stages of keratoconus. This procedure has been successful with a high percentage of clear grafts.25 It can be expected that as grafts survive for longer periods of time, and there is more long-term follow-up, more cases similar to the present one may be seen.…”

Section: Discussionmentioning

confidence: 99%

Recurrence of keratoconus in donor cornea 22 years after successful keratoplasty.

Nirankari¹,

Karesh²,

Bastion³

et al. 1983

British Journal of Ophthalmology

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“…Most stream sediment surveys are conducted on the assumption that seasonal variation is minimal, but with the current interest in selective analysis of the Fe-Mn oxides this approach may require reconsideration. In a study conducted in Wales, Fanta (1972) determined that seasonal effects were noticeable in those elements subject to coprecipitation by Fe and Mn oxides, indicating that the precipitate phase of the stream sediment was in a state of delicate balance with the chemistry of the stream and the groundwater.…”

Section: Seasonal Variationsmentioning

confidence: 99%

Stream sediment geochemistry

Bloom¹,

Theobald²,

Meyer³

1979

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Stream sediments are characterized more by their variability than by their uniformity in composition, grain size, sorting and colour. This variability is a function of the geology, terrain, and climate of the catchment areas sampled by the stream, and it provides the essential ingredient for viable stream sediment surveys. Prospectors have always made use of this fact, initially through observation of mineralized boulders and panning of heavy minerals from the stream bed, and more recently by chemical analysis of the finer fractions of stream sediment. Over the past 25 years, routine application of strea m sediment geoche mistry has become accepted by government and intergovernmental agencies and the mining industry as the principal method of low-cost reconnaissance exploration in those areas, favoured by the combination of adequate relief and precipitation, where a suitable, integrated drainage system has developed.At present, surveys that make use of trace analysis of the fine fraction (normally minus-80mesh) of active sediments, although still the most common, are increasingly being questioned. In areas of extreme climate or where information from the fine sediment is no longer adequate, enhancement of anomalies may require sampling of organic material, of specific coarse fractions of inorganic sediment, of selected mineral groups within the sediment that may be isolated mechanically or chemically, or of a combination of these materials. As a result, variations in sampling and analytical methods have been developed to accommodate regional and climatic differences and differing survey aims (Le., mUlti-purpose or strictly prospecting, single or multiple target).This review outlines the present art with selected examples of surveys by both government and industry. The largest single expense is the sample collection cost, particularly the transportation cost to or between sa mple sites, and to optimize this investment the tendency is to collect multiple samples at each site and for multi-element analyses. Mathematical and graphical interrelation of all of these components with the geology, geophysics, and physiography of the area under stUdy, usually requiring computer technology, provides a far greater insight into the exploration targets sought today than the single-sample, single-element approach that was so successful in the past. ResumeLes sediment {luviatiles manifestent frequemment un certain degre de variabilite de composition, granulometrie, triage et couleur. Cette variabilite depend de la geologie, de la nature du terrain et du climat du bassin-versant qui ali mente Ie cours d'eau, et constitue la base d'une prospection serieuse des sediments fluviatiles. Les prospecteurs ont toujours tenu compte de ce fait: autrefois, ils examinaient les blocs mineralises et recueillaient par lavage les mineraux lourds se trouvant dans Ie lit du cours d'eau; de nos jours, ils etudient la composition chimique des plus fines fractions granulometriques des sediments {luviatiles. Depuis 25 ans, les organismes gouvernementa...

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Akuter Keratoconus

Cited by 4 publications

References 2 publications

Recurrence of Keratoconic Pathology in Penetrating Keratoplasty Buttons Originally Transplanted for Keratoconus

Recurrence of Keratoconic Pathology in Penetrating Keratoplasty Buttons Originally Transplanted for Keratoconus

Recurrence of keratoconus in donor cornea 22 years after successful keratoplasty.

Stream sediment geochemistry

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