American Giantitis

Kramer, M. M.

doi:10.1017/s0084255900014443

Cited by 2 publications

(2 citation statements)

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“…been substantiated by ourselves and others (12) by the observation of a transient charge-transfer species, I,,,, -420 nm, from the methylene blue triplet. This absorption band is assigned to the semiradical form of methylene blue.…”

Section: Quenching Of Singlet Oxygenmentioning

confidence: 71%

On the Mechanism of Quenching by Amines: A New Method for Investigation of Interactions with Triplet States

Young¹,

Brewer²,

Kayser³

et al. 1974

Can. J. Chem.

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Can. J . Chem. 52.2889Chem. 52. (1974. Rate constants for the quenching of singlet oxygen by a series of s~~b s t i t~~t e d N,A1-dirnethylanilines were obtained by a direct method employing a dye-laser. The Hammett p value obtained from the data (-1.71) suggests that a (partial) charge-transfer complex may be responsible for the quenching action. This rate data was combined with that obtained for the total quenching action o n the sensitized photooxidation of 1,3-diphenylfuran. The quenching action on the photooxidation reaction is due to both the quenching of singlet oxygen and the quenching of the triplet state of the sensitizer (rose bengal or methylene blue). The combination of the data from each series of experiments resulted in rate constants of quenching of the triplet states of the sensitizers. A number of the N,Ar-dimethylanilines quenched the triplet states at the diffusion limit. Hamniett p v a l~~e s ( -1.86 for rose bengal and -4.19 for niethylene blue) indicate that charge-transfer intermediates are probably responsible for the quenching action. This was confirmed by the observation of a transient intermediate assigned to the charge-transfer radical of methylene blue. The t e c h n i q~~e ~~s e d here represents a novel approach to the investigation of triplet states.

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Section: Quenching Of Singlet Oxygenmentioning

confidence: 71%

On the Mechanism of Quenching by Amines: A New Method for Investigation of Interactions with Triplet States

Young¹,

Brewer²,

Kayser³

et al. 1974

Can. J. Chem.

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“…Isaacs et al (1976) showed that patients with ileostomies had increased potential differences across their ileal mucosa, although plasma aldosterone values were normal. Administration of fludrocortisone to ileostomists increases K losses (Kramer & Levitan, 1972). By increasing transmucosal potential difference aldosterone may favour the accumulation of higher levels of intraluminal potassium, or alternatively may directly affect active K transport in the mucosa such as occurs in the large intestine (Edmonds, 1981).…”

Section: Discussionmentioning

confidence: 99%

Effect of feeding β-sitosterol alone or in combination with cholestyramine during early life on subsequent response to cholesterol challenge in adult life in guinea-pigs

Hassan¹,

Gallon²,

Yunker³

et al. 1982

BJN

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I. Most subjects who have their large intestine removed and an ileostomy formed lead a healthy life after operation, although they are prone to a variety ofmetabolic problems. In order to determine the factors likely to lead to these metabolic disturbances a detailed assessment of ileostomy output and composition and of dietary intake in relation to nutritional and metabolic status has been made in a group of ileostomy patients living at home. 2.Thirty-six volunteers with established ileostomies (twenty-six ulcerative colitis (UC) patients and ten Crohn's colitis (CC) patients) made a 24 h collection of urine and ileostomy effluent and kept a 7 d record of dietary intake and the frequency w t h which they emptied their ileostomy bag. Blood was collected for haematological and biochemical indices of nutritional status and height, weight and skinfold thickness were measured.3. Effluent output for the whole group was 760+322 g/day (range 273-1612) and was very closely related to effluent sodium output (R 0.98). Stepwise multiple regression analysis of dietary and other variables identified the amount of ileum resected as the main determinant of both effluent output and effluent sodium. The CC group had significantly greater effluent output (1084+340 g/d) compared with the UC patients (635+215 g/d) (P < 0401); and excreted significantly more nitrogen, carbohydrate and sodium than the UC group.4. The CC patients particularly showed evidence of salt depletion. The mean (fm) 24 h urine Na loss for CC patients was 31 & 30 mmol and for UC patients 67 + 34 mmol (P c 0.01) with five of the ten CC patients v. four of the twenty-six patients with UC having raised urinary or plasma aldosterone levels. 5.All subjects had normal haematological and biochemical indices of nutritional status in the blood. Height and percentage body fat were also within the normal range when compared with a control population matched for age, sex and occupation, but patients with an ileostomy weighed on average 4.1 kg less than the controls. 6. These studies show that patients with an ileostomy come within the range of the normal population for most nutntional indices although are at increased risk of salt depletion. Effluent volume, which is probably the determining factor in most metabolic complications of ileostomy, is related more to the extent of the small bowel resection than to diet.

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American Giantitis

Cited by 2 publications

References 0 publications

On the Mechanism of Quenching by Amines: A New Method for Investigation of Interactions with Triplet States

On the Mechanism of Quenching by Amines: A New Method for Investigation of Interactions with Triplet States

Effect of feeding β-sitosterol alone or in combination with cholestyramine during early life on subsequent response to cholesterol challenge in adult life in guinea-pigs

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