Effect of partial hippocampal resection on stress mechanism in rats

1961 ◽  
Vol 201 (2) ◽  
pp. 337-340 ◽  
Author(s):  
Chul Kim ◽  
Chang Uk Kim
Keyword(s):  
Ascorbic Acid ◽  
Chronic Stress ◽  
Acid Content ◽  
Acute Stress ◽  
Ascorbic Acid Content ◽  
Inhibitory Influence ◽  
Acute And Chronic Stress ◽  
The Difference ◽  
The Right ◽  
And Control

Chronic (repeated skin incisions) as well as acute stress (left adrenalectomy) was applied to rats whose hippocampus had been damaged through the neocortex (hippocampus-damaged), to rats in which only the portion of the neocortex over the hippocampus had been damaged (neocortex-damaged), and to control rats. Both in the acute and chronic stress series, the left adrenal ascorbic acid content before stress was compared with that of the right adrenal gland following stress, and the difference served as a measure of reaction to the stress. Under acute stress, 72 rats showed a decrease in adrenal ascorbic acid content more pronounced in hippocampus-damaged rats and control animals than in the neocortex-damaged animals. Under chronic stress, increase in adrenal ascorbic acid content in 68 rats was least pronounced in hippocampus-damaged rats, most marked in neocortex-damaged animals, while the value was intermediate in control rats. The inference from these data is that the hippocampus exerts a sustained inhibitory influence upon the pituitary-adrenocortical mechanism.

THE DIURNAL FLUCTUATION OF ASCORBIC ACID AND PROGESTERONE CONTENTS IN THE OVARIES OF INTACT AND HYPOPHYSECTOMIZED IMMATURE PSEUDOPREGNANT RATS

1967 ◽  
Vol 56 (3) ◽  
pp. 459-468 ◽  
Author(s):  
C. A. de Groot
Keyword(s):  
Ascorbic Acid ◽  
Acid Content ◽  
Ascorbic Acid Content ◽  
Diurnal Fluctuation ◽  
Immature Rats ◽  
Hypophysectomized Rats ◽  
The Right

ABSTRACT The ovaries of pseudopregnant immature rats contain less ascorbic acid and more progesterone at 4 p.m. than at 10 and 12 a. m. and 2 p.m. Two days after hypophysectomy, during which time prolactin injections were given to maintain pseudopregnancy, the ascorbic acid content still decreased, while the progesterone content failed to increase. In the intact animals, the increase in progesterone content and part of the ascorbic acid decrease may be explained by a surge of endogenous LH during the afternoon. All effects in the hypophysectomized rats should result from the predominance of catabolic processes. In intact and in hypophysectomized animals the right ovaries usually weigh less than the left ovaries.

scholarly journals Effect of 1– MCP concentration, exposure time and storage temperature on post-harvest quality of mango fruit cv. Alphanso

Food Research ◽  
2020 ◽  
Vol 4 (3) ◽  
pp. 746-752 ◽  
Author(s):  
S.S. Gaikwad ◽  
B.K. Sakhale ◽  
R.F. Chavan
Keyword(s):  
Ascorbic Acid ◽  
Shelf Life ◽  
Acid Content ◽  
Storage Temperature ◽  
Research Work ◽  
Ascorbic Acid Content ◽  
Soluble Solids ◽  
Titrable Acidity ◽  
Physico Chemical ◽  
And Control

Present research work was undertaken to study the effect of 1-Methyl Cyclopropene (1- MCP) on quality and shelf life of the mango fruits (Cv. Alphanso). The freshly harvested matured mango fruits were treated with fungicide at 0.5 µL/L concentration for 10 mins followed by washing and cleaning. The fruits were then exposed to different concentrations of 1-MCP viz. 0.5, 1.0, 1.5 and 2 µL/L at 20°C for 12 and 24 hrs respectively along with control fruits in an airtight chamber. The results obtained after conducting the above experiments indicated that the ripening was delayed by 1-MCP at early stages and shelf life of the fruit increases as the concentration of 1-MCP increased. Various physico-chemical changes such as physiological loss in weight (PLW), total soluble solids, surface colour, titrable acidity, ascorbic acid content and firmness of fruit was majorly influenced by 1-MCP which showed lower physiological loss in weight (11.6%), gradual increase in TSS from 9.7 to 22.1°Brix and colour from -3.63 to 2.59, considerable decrease was observed in titrable acidity from 1.34 to 0.14%, Ascorbic acid content from 81.18 to 25.2 mg/100 g and texture decreased from 312 to 66 gf respectively as compared to rest of the treatments and control fruits.

scholarly journals DYNAMICS OF THE CHEMICAL COMPOSITION OF BERRIES OF INTRODUCED CULTIVARS AND FORMS OF CRANBERRIES IN THE CONDITIONS OF CENTRAL SIBERIAN BOTANICAL GARDEN SB RAS

2021 ◽  
pp. 241-249
Author(s):  
Aleksey Borisovich Gorbunov ◽  
Tat'yana Abdulkhailovna Kukushkina
Keyword(s):  
Ascorbic Acid ◽  
Chemical Composition ◽  
Acid Content ◽  
Western Siberia ◽  
Ascorbic Acid Content ◽  
Titratable Acidity ◽  
Botanical Garden ◽  
The Difference ◽  
Biochemical Research ◽  
Dry Substance

The aim of the work was study of the variability of fruit chemical composition of O. palustris (2 samples) and O. macrocarpus (6 samples) cultivars and forms introduced in CSBG depending on the conditions of the year. Biochemical research of the content of dry substance, ascorbic acid, sugars, titratable acidity, anthocyanins, pectins, protopectins and catechins in berries of these samples were conducted. The chemical composition was analyzed by conventional methods. O. palustris surpasses O. macrocarpus in the content of ascorbic acid and titratable acidity, but is inferior to it in the accumulation of anthocyanins, pectins and protopectins. In comparison with the studied samples of both species, the native O. palustris accumulates the greatest amount of ascorbic acid and the least amount of sugars. The early cultivars of O. macrocarpus exceeds the mid-season cultivars and are close to late-maturing ones in terms of ascorbic acid content. The difference in the accumulation of other ingredients in the fruits of both O. palustris and O. macrocarpus is not statistically significant. According to the chemical composition of berries, O. palustris and O. macrocarpus are promising for introduction in the South of Western Siberia.

Analysis of ascorbic acid content in various fruits and vegetables by spectrofluorimetric methods

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
A Haskovic ◽  
A Copra Janicijevic ◽  
A Topcagic ◽  
L Klepo ◽  
A Kapur ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Acid Content ◽  
Fruits And Vegetables ◽  
Ascorbic Acid Content

An intervention study on the effectiveness of an anti-stress-app on psychophysiological acute and chronic stress (Preprint)

2018 ◽  
Author(s):  
Franziska Lautenbach
Keyword(s):  
Chronic Stress ◽  
Acute Stress ◽  
Physiological Stress ◽  
Stress Test ◽  
Experimental Studies ◽  
Trier Social Stress Test ◽  
Control Group ◽  
Subjective Perception ◽  
Face To Face ◽  
Acute And Chronic Stress

BACKGROUND Dealing with stress is of central importance. Lately, smartphone applications (apps) are deployed in stress interventions as they offer maximal flexibility for users. First results of experimental studies show that anti-stress apps effect subjective perception of stress positively (Ly et al., 2014). However, current literature lacks studies on physiological stress reactions (e.g., cortisol), although they are of special interest to health issues. OBJECTIVE Therefore, the aim of this study was to investigate the effectiveness of an anti-stress app in chronic and acute stress reduction on a physiological (cortisol) and psychological level (subjective perception of stress) in comparison to a face-to-face and a control group in a pre-post design, for the first time. METHODS Sixty-two participants took part in the pretesting procedure (drop-out of 53 %). Based on age, gender, physical activity and subjectively perceived acute stress due to the Trier Social Stress Test for groups (TSST-G; von Dawans et al., 2011) as well as based on subjectively chronic stress assessed during the pretest, participants were parallelized in three groups (anti-stress-app: n = 10, face-to-face: n = 11, control group: n = 9). RESULTS After six weeks of the cognitive-based resource-oriented intervention, participants were exposed to the TSST-G for post testing. Results did not show a change of cortisol secretion or cognitive appraisal of the acute stressor. Further, no changes were detected in the chronic physiological stress reaction. CONCLUSIONS Possible causes are discussed extensively. CLINICALTRIAL no

scholarly journals Silicon attenuates calcium deficiency by increasing ascorbic acid content, growth and quality of cabbage leaves

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dalila Lopes da Silva ◽  
Renato de Mello Prado ◽  
Luis Felipe Lata Tenesaca ◽  
José Lucas Farias da Silva ◽  
Ben-Hur Mattiuz
Keyword(s):  
Ascorbic Acid ◽  
Nutrient Solution ◽  
Acid Content ◽  
Dry Matter ◽  
Ascorbic Acid Content ◽  
Calcium Deficiency ◽  
Ca Deficiency ◽  
Leaf Water Loss ◽  
Nutrient Solutions

AbstractCalcium (Ca) deficiency in cabbage plants induces oxidative damage, hampering growth and decreasing quality, however, it is hypothesized that silicon (Si) added to the nutrient solution may alleviate crop losses. Therefore, this study aims at evaluating whether silicon supplied in the nutrient solution reduces, in fact, the calcium deficiency effects on cabbage plants. In a greenhouse, cabbage plants were grown using nutrient solutions with Ca sufficiency and Ca deficiency (5 mM) without and with added silicon (2.5 mM), arranged as a 2 × 2 factorial in randomized blocks, with five replications. At 91 days after transplanting, the plants were harvested for biological evaluations. In the treatment without added Si, Ca deficiency promoted oxidative stress, low antioxidant content, decreased dry matter, and lower quality leaf. On the other hand, added Si attenuated Ca deficiency in cabbage by decreasing cell extravasation while increasing both ascorbic acid content and fresh and dry matter, providing firmer leaves due to diminished leaf water loss after harvesting. We highlighted the agronomic importance of Si added to the nutrient solution, especially in crops at risk of Ca deficiency.

COMPARISON OF ASCORBIC ACID CONTENT IN IMPORTED TOMATOES AND IN CULTIVARS GROWN IN NOVA SCOTIA

1987 ◽  
Vol 67 (1) ◽  
pp. 331-335
Author(s):  
HAK-YOON JU ◽  
W. JOHN MULLIN
Keyword(s):  
Ascorbic Acid ◽  
Nova Scotia ◽  
Vitamin C ◽  
Acid Content ◽  
Ascorbic Acid Content ◽  
Fresh Weight ◽  
Atlantic Region ◽  
Significant Difference ◽  
Cluster Location ◽  
Greenhouse Tomatoes

The ascorbic acid (vitamin C) content of fresh imported field tomatoes and Nova Scotia greenhouse and field tomatoes was determined on a bi-weekly basis during the period of availability of each type of tomato to the Nova Scotia consumer in 1984. The average ascorbic acid contents of imported and Nova Scotia field and greenhouse tomatoes were 13.3, 16.7 and 17.7 mg 100 g−1 fresh weight, respectively. A study of nine recommended or promising field tomatoes for the Atlantic region showed significant differences in ascorbic acid content among the cultivars. The cultivar Quick Pick had the highest ascorbic acid content of 22.5 ± 1.5 mg 100 g−1, the cultivar Campbell 18 had the lowest content, 12.0 ± 2.9 mg 100 g−1. In Dombito greenhouse tomatoes the stage of maturity and the effect of cluster location were tested against ascorbic acid content. The lowest ascorbic acid content of 9.1 ± 1.0 mg 100 g−1 was found with the small green tomatoes while others from mature green to overripe contained 14.0–16.7 mg 100 g−1. Tomatoes from different cluster locations showed no significant difference in ascorbic acid content.Key words: Vitamin C, L-ascorbic acid, tomatoes

scholarly journals Antioxidant Potential in Different Parts and Callus ofGynura procumbensand Different Parts ofGynura bicolor

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Vijendren Krishnan ◽  
Syahida Ahmad ◽  
Maziah Mahmood
Keyword(s):  
Ascorbic Acid ◽  
Acid Content ◽  
Phenolic Content ◽  
Reducing Power ◽  
Ascorbic Acid Content ◽  
Total Phenolic ◽  
Total Flavonoid Content ◽  
Dpph Radical ◽  
Flavonoid Content ◽  
Different Parts

Plants from Gynura family was used in this study, namely,Gynura procumbensandGynura bicolor.Gynura procumbensis well known for its various medicinal properties such as antihyperglycaemic, antihyperlipidaemic, and antiulcerogenic; meanwhile,G. bicolorremains unexploited. Several nonenzymatic antioxidants methods were utilized to study the antioxidant capacity, which include ferric reducing antioxidant power (FRAP), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay, total flavonoid content, total phenolic content, and ascorbic acid content determination. DPPH assay revealsG. procumbensshoot as the lowest (66.885%) andG. procumbensroot as the highest (93.499%) DPPH radical inhibitor. In FRAP assay, reducing power was not detected inG. procumbensleaf callus (0.000 TEAC mg/g FW) wherebyG. procumbensroot exhibits the highest (1.103 TEAC mg/g FW) ferric reducing power. Total phenolic content and total flavonoid content exhibited similar trend for both the intact plants analysed. In all antioxidant assays,G. procumbenscallus culture exhibits very low antioxidant activity. However,G. procumbensroot exhibited highest phenolic content, flavonoid content, and ascorbic acid content with 4.957 TEAC mg/g FW, 543.529 QEµg/g FW, and 54.723 µg/g FW, respectively. This study reveals thatG. procumbensroot extract is a good source of natural antioxidant.

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