Marginal necrosis

Acid-t) pe necrotic lesion tip burn on fir needles leaf margin necrosis on broad leaves... 

Are there any changes in colour of leaves or needles Can there be seen signs of necrosis If so, are they irregularly distributed, which often is considered as typical for ozone injury, for example, in tobacco or pinto beans (Plate 7 and 8) Or are they concentrated on leaf margins and tips, which often is observed after the slow accumulation of chloride (Halbwachs, 1963) or fluoride (Guderian et al., 1969) Plate 9 shows typical marginal necrosis of an elm leaf, plate 10 tip necrosis of tulip leaves, whereas the flowers themselves are not injured. Acute injury by SO2 often appears as interveinal chlorosis followed by necrosis which can be seen at an elm leaf in plate 11. On the contrary, ozone injury mostly consists of small chlorotic or necrotic spots. Pine needles (plate 12) and... 

A worker who accidentally fell into a shallow vat containing 40% phenol for a few seconds subsequently collapsed and suffered 50% body surface burns he developed nausea and vomiting and was diagnosed as suffering from acute renal tubular necrosis. After a number of days, respiratory distress also developed. Kidney function improved after 6 weeks, but the patient still showed marginal polyuria 1 year later. 

Treatment with guanidine may produce clinical improvement within 3 to 4 days. Side effects include paresthesia, gastrointestinal distress, renal tubular necrosis, and hyperirritability. The most serious effect is bone marrow depression, which is dose-related and potentially fatal. Aminopyridines have been used in clinical studies with some positive results. Corticosteroids and plasmapheresis may also be of some benefit, whereas anticholinesterase agents are only marginally effective. 

Currently no herbicides are cleared for use in the U.S. to control weeds in Jerusalem artichokes. Preliminary tests with several herbicides have been reported (Table 12.1). For example, the cultivar Columbia displayed satisfactory tolerance to preplant incorporated treatments of chloramben, S-ethyl dipropylthiocarbamate (EPTC), ethalfluralin, pendimethalin, and trifluralin, although metribuzin resulted in considerable damage, manifested as chlorosis and necrosis of leaf margins, and reduced plant height. Tuber yield, however, was not increased by weed control, whether via herbicides or hand weeding, when compared to weedy control treatments (Wall et al., 1987). 

Plate 9. Marginal yellow leaf chlorosis and brown necrosis as a result of the accumulation of fluoride in leaf margins of elm tree (Ulmus pumila L.). Ogden, Utah. U.S.A., 1969. 

Selection of newdy formed B cells to transitional, follicular and marginal-zone (MZ) B cells depends on integrated signals from several classes of surface receptors such as, the BCR and co-signals, the tumor-necrosis factor receptor (TNER) family, and the G-protein-coupled receptors (GPCRs). 

Cryosurgery Cryotherapy of tumours was introduced by I.S. Cooper in 1963. Intraoperative insertion of a probe into the liver tumour is carried out directly. Necrosis is induced in the tumour tissue by the application of fluid nitrogen as well as by the subsequent rethawing of the iced area (ca. -50°C). This procedure is usually repeated. It is indicated in cases of non-resectable liver tumours and for the freezing of margins following resection. (21, 175) (s. p. 798)... 

MacKay et al 1983). It has been hypothesized that blood flow to the renal pelvis is marginal in the horse and, in the presence of even mild dehydration or hypotension, maintaining adequate blood flow may require PG-mediated vasodilation. Under these conditions, the renal pelvis of the horse may be exquisitely sensitive to ischemic necrosis induced by the anti-PG effects of NSAIDs (Gunson 1983). 

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