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29682. The NADPH oxidase inhibitors iodonium diphenyl and cadmium sulphate inhibit hypoxic pulmonary vasoconstriction in isolated rat pulmonary arteries
- Creator:
- Jones, R. D., Thompson, J. S., and Alyn H. Morice
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, fyziologie, physiology, NADPH oxidase, hypoxic pulmonary vasoconstriction, iodonium diphenyl cadmium sulphate, isolated rat pulmonary artery, 14, and 612
- Language:
- English
- Description:
- Interest surrounds the role of an NADPH oxidase-like enzyme in hypoxic pulmonary vasoconstriction (HPV). We have studied the effects of the NADPH oxidase inhibitors iodonium diphenyl (ID) and cadmium sulphate (CdSO4) upon HPV of isolated rat pulmonary arteries (n = 73, internal diameter 545± 23 mm). Vessels were preconstricted with prostaglandin F2a (PGF2a, 0.5 or 5 mM) prior to a hypoxic challenge. ID (10 or 50 mM), CdSO4 (100 mM) or vehicle (50 ml) was added for 30 min before re-exposure to PGF2a and hypoxia. ID and CdSO4 significantly inhibited HPV. In vessels preconstricted with 5 mM PGF2a, ID (10 and 50 mM) reduced HPV from 37.4± 5.6 % to 9.67± 4.4 % of the contractile response elicited by 80 mM KCl (P<0.05) and from 30.1± 5.0 % to 0.63± 0.6% 80 mM KCl response (P<0.01), respectively. CdSO4 (100 mM) reduced HPV from 29.4±4.0 % to 17.1±2.2% 80 mM KCl response (P<0.05). In vessels preconstricted with 0.5 mM PGF2a, ID (10 and 50 mM) reduced HPV from 16.0± 3.15% to 3.36± 1.44 % 80 mM KCl response (P<0.01) and from 15.0± 1.67 % to 2.82± 1.40 % 80 mM KCl response (P<0.001), respectively. Constriction to PGF2a was potentiated by ID. ID and CdSO4, at concentrations previously shown to inhibit neutrophil NADPH oxidase, attenuate HPV in isolated rat pulmonary arteries. This suggests that an NADPH oxidase-like enzyme is involved in HPV and could act as the pulmonary oxygen sensor., R. D. Jones, J. S. Thompson, A. H. Morice., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
29683. The nature of prejudice: 60 years after Allport: Seminar of the Intercultural Section of the Czech-Moravian Psychological Society
- Creator:
- Graf, Sylvie and Žingora, Tibor
- Type:
- article, model:article, and TEXT
- Language:
- Czech
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
29684. The negative effects of clethodim in photosynthesis and gas-exchange status of maize plants are ameliorated by salicylic acid pretreatment
- Creator:
- Radwan, D. E. M. and Soltan, D. M.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- botanika, botany, clethodim herbicide, gas exchange, photosynthesis, pigments, proteins, salicylic acid, 2, and 58
- Language:
- Multiple languages
- Description:
- In this work, the injuries caused by clethodim herbicide application as well as the use of exogenous salicylic acid (SA) as a protective agent against clethodim in Zea mays leaves were examined. Although the target for clethodim is the inhibition of acetyl coenzyme A carboxylase (ACCase) which is the key enzyme for fatty acid biosynthesis, it can indirectly affect the photosynthetic machinery, gaseous exchange and some biochemical parameters. Clethodim application caused chlorosis and yellowing of leaf-tip parts. Higher doses caused browning or reddening of leaves and sometimes dead parts of the leaf margins were observed. The rate of photosynthesis was significantly lowered and the pigments content was highly reduced as a response to clethodim spraying. Moreover, other gas-exchange properties were altered. Furthermore, accumulation of high amounts of carbohydrates, proteins and proline were detected. SA spraying three days prior clethodim application caused partially or totally disappearance of clethodim injuries and kept the leaves similar to those of control. Improved photosynthesis and enhanced pigments content were observed in leaves treated with SA. Other analyzed parameters showed values similar to those of the corresponding control. From the experimental work, an evidenced role of SA working against clethodim effects was suggested and discussed in this paper., D. E. M. Radwan, D. M. Soltan., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
29685. The nervous system of Polystoma indicum (Monogenea: Polystomatidae) as revealed by nonspecific esterase localization
- Creator:
- Dutta, M. and Tandon, V.
- Format:
- Type:
- model:internalpart and TEXT
- Subject:
- Polystoma indicum, Polystomatida, Monogenea, nervous system, and nonspecific esterases
- Language:
- English
- Description:
- Using the localization of nonspecific esterases, the nervous system of Polystoma indicum Diengdoh et Tandon, 1991 could be revealed in toto. The nervous system is bilaterally symmetrical. Cerebral ganglia, which are connected by a thick dorsal commissure, are present dorsal to the pharynx. From the cerebral ganglia arise five anterior pairs and four posterior pairs of nerve trunks. The anterior nerves and/or their fine branches join to form a conspicuous circumoral nerve ring complex. The posterior nerves unite in the opisthaptoral region to form two main haptoral nerves, the branches from which innervate the components of the opisthaptor. Presence of nerve cells is also revealed in association with the main nerves, more predominantly in the vicinity of the opisthaptoral suckers.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
29686. The noradrenergic innervation and steroidogenic activity of porcine cystic ovaries
- Creator:
- Kozłowska, A., Wojtkiewicz, J., Majewski, M., and Jana, B.
- Type:
- article, články, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, fyziologie člověka, human physiology, ovarian cysts, noradrenergic innervation, steroids, pigs, 14, and 612
- Language:
- English
- Description:
- The aim of the present study was to investigate the distribution and density of noradrenergic nerve fibres (NNFs), content of catecholamines (CATs) and steroids in the cystic ovaries of gilts receiving DXM from middle luteal phase. Cystic status of ovaries was induced by i.m. DXM injections on days 7-21 of the estrous cycle. During the same time, gilts in the control group received saline. The ovaries were collected on predicted day 11 of the second studied estrous cycle. The cystic ovaries were supplied by more numerous NNFs than the control gonads. Moreover after DXM injections, the content of CATs and progesterone and androstendione (A4) in the cystic wall were elevated, while the levels of A4, testosterone and estradiol-17β in the cystic fluid were lowered. Our results show that in the porcine cystic ovaries, induced by DXM injections from middle phase of estrous cycle, increased the density of NNFs and level of CATs, and that it was accompanied by changes in the content of steroids. Moreover, this study is a further confirmation that the morphological and functional changes of cystic ovaries are partly dependent on phase of the estrous cycle in which the induction of the ovarian cysts was initiated., A. Kozłowska, ... [et al.]., and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
29687. The North or the South? Early medieval ceramics decorated with a zoned ornament - the result of local changes or interregional contacts?
- Creator:
- Kolenda, Justyna and Zamelska-Monczak, Kinga
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- wheel-turned ceramics, zoned vessels, early medieval pottery, southern Greater Poland, Lower Silesia, Bohemia, keramika vytáčená na kruhu, nádoby s pásovou výzdobou, raně středověká keramika, jižní Velkopolsko, Dolní Slezsko, and Čechy
- Language:
- Czech
- Description:
- Studie otevírá diskusi s názory o původu a vývojových proměnách keramiky vytáčené kompletně na hrnčířském kruhu a opatřené pásovou výzdobou. Tato keramická třída byla používána v raném středověku (po dobu asi jednoho století) komunitami žijícími na jihu Velkopolska a v severovýchodní části Dolního Slezska. Dosavadní představy naznačující úzký vztah s obdobně zdobenou keramikou produkovanou v severních částech Čech jsou přehodnoceny s poukazem na vnitřní rozmanitost celé keramické třídy. Inspirační zdroje nepřicházely pouze z jihu (tj. z Čech), ale také ze severu (Pomořansko) a ze západu (oblast středního toku Labe). V rámci tohoto druhu keramiky lze pozorovat proměny, které se v produkci malých lokálních komunit objevují nezávisle na vnějších impulsech. and The article underlines the need to re-discuss the prevailing views in archaeological literature on the provenance and transformation stages of completely wheel-turned ceramics decorated with zoned ornament. This class of ceramics was used in the Early Middle Ages (for about 100 years) by communities living in the area of southern Greater Poland and the north-eastern part of Lower Silesia. The previous ideas suggesting a close relationship between zoned ceramics and vessels produced in northern Bohemia are reconsidered, with the internal diversity of zoned ceramics being pointed out. We argue that inspiration in ceramics manufacturing came not only from the south (Bohemia), but also from the north (Pomerania) and the west (the middle Elbe region), and that there were also changes that appeared independently of these impulses in the ceramics production of small, native communities.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
29688. The Notion of Transience in Sino-Japanese Aesthetics
- Creator:
- Milčinski, Maja
- Type:
- model:internalpart and TEXT
- Language:
- Czech
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
29689. The occurrence of C4 photosynthesis in Yunnan province, a tropical region in South-western China
- Creator:
- Wang, R. Z.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- altitudinal distribution pattern, habitats, and morphological functional types
- Language:
- Multiple languages
- Description:
- Floristic composition, morphological functional types, and altitudinal distribution pattern for C4 species were studied in Yunnan province, South-western China. 159 species, in 6 families and 60 genera, were identified with C4 photosynthesis. 93 % of these C4 species were found in Monocotyledoneae, e.g. Cyperaceae (18 species), Gramineae (129 species), and Commelinaceae (1 species), the other 7 % was in Dicotyledoneae, e.g. Amaranthaceae (5 species), Portulacaceae (4 species), and Chenopodiaceae (2 species). Hence C4 plants mainly occurred in very few families in the tropical region. Compared with those in semi-arid grasslands and arid deserts in North China, more C4 grasses and much less Chenopodiaceae C4 species occurred in the tropical region. This indicates the physiological responses of C4 plants from the two families are very different. Chenopodiaceae C4 species may be more fit semi-arid and arid environments, while C4 grasses are more fit the moist tropical conditions. There was a strong relationship between C4 distribution and altitude in the tropical region. Altitudinal distribution pattern for C4 species in the region was consistent with altitude, climate, and habitats.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
29690. The occurrence of C4 plants and their morphological functional types in the vegetation of Xinjiang, China
- Creator:
- Wang, R. Z.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- annual C4 species, arid region, and habitats
- Language:
- Multiple languages
- Description:
- Floristic composition, morphological functional types and habitat distributions for C4 species were studied in Xinjiang, North-western China. 89 species, in 9 families and 41 genera, were identified with C4 photosynthesis. 48 % of these C4 species were found in Monocotyledoneae, e.g. Cyperaceae (5 species), Gramineae (38 species), the other 52 % was in Dicotyledoneae, e.g. Chenopodiaceae (29 species), Amaranthaceae (7 species), and Polygonaceae (5 species). Compared with those in semi-arid grasslands in North China and tropical forests in South China, more plant families were found with the occurrence of C4 plants in this arid region. Relatively higher annual species (63 %), shrubs (18 %), and Chenopodiaceae C4 species (33 %) compositions were the primary characteristics for the C4 species occurring in Xinjiang, and this was remarkably related with its arid environment. More Chenopodiaceae C4 species occurring in the region suggested that this type of C4 species may have higher capacity to fit the air and soil droughts. There was a strong relationship between C4 occurrence and habitat distributions, more than half of the total 89 C4 species were found in disturbed and cultivated lands and early stages of vegetation successions, indicating C4 occurrence was not only related with climate changes, but also with land uses and vegetation dynamics.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public