排序方式： 共有31条查询结果，搜索用时 15 毫秒
1.
Haematological and biochemical investigations were performed on 14 koalas with uncomplicated cystitis, 8 with complicated cystitis, 8 with conjunctivitis, 8 with lymphosarcoma, and 14 with miscellaneous diseases. Changes were limited and inconsistent in individual koalas with uncomplicated cystitis and conjunctivitis. In contrast, individual koalas with complicated cystitis were more likely to have anaemia, leukocytosis due to neutrophilia, hypoproteinaemia due to hypoalbuminaemia, and azotaemia due to elevated urea concentration. Although these changes were non-specific they did allow assessment of prognosis for survival and response to treatment. Koalas with lymphosarcoma were invariably anaemic, leukaemic, azotaemic and hypoalbuminaemic. Elevated enzymes (aspartate transaminase [AST]. lactate dehydrogenase [LD] and gamma glutamyl transferase [GGT]) were more common in koalas with lymphosarcoma. Koalas affected by miscellaneous conditions showed variable changes but once again anaemia, leukocytosis, azotaemia, elevated AST and LD, and hypoalbuminaemia were not uncommon. On the basis of these findings a minimal profile is suggested for the investigation of sick koalas and would include haematocrit, total and differential leukocyte counts, urea, total protein and albumin concentrations and AST, GGT and LD activities. 相似文献
2.
Environmental correlates of body size distribution in Cyprinidae (Actinopterygians) depend on phylogenetic scale 
下载免费PDF全文
下载免费PDF全文 Gaël P.J. Denys Pablo A. Tedesco Thierry Oberdorff Philippe Gaubert 《Ecology of Freshwater Fish》2016,25(1):125-132
The pattern of increasing species body size with increasing latitude has been noticed in different groups of animals. Here, we used seven key environmental factors and independent contrasts to assess body size latitudinal clines in Cyprinidae at two phylogenetic levels (inter‐ and intragenera), which were defined using a genus‐level supertree. Model selection procedures revealed that environmental factors shaping body size variation in Cyprinidae differed according to the phylogenetic scale considered. At the higher phylogenetic level, we found that both temperature (negative effect) and habitat availability (positive effect of drainage basin surface area) constituted mechanistic explanations of large‐scale body size distribution. No temperature‐related body size cline was observed at the intragenus level. Instead, competitive interaction (negative effect of species richness), habitat availability (positive effect of drainage basin surface area), migration ability and available energy (positive effects of glacial coverage and actual evapotranspiration) constitute alternative explanations at this lower phylogenetic scale. We conclude that (i) at the intergenus level, cyprinids do show a tendency to be smaller at high temperatures and larger at low temperatures, (ii) this tendency no longer exists at the intragenus level, (iii) latitude per se is a weak predictor of body size clines whatever the taxonomic level analysed, (iv) generalising geographical body size patterns may be rendered difficult by the superimposition of a series of mechanisms across different taxonomic scales, and (v) habitat size, here acting positively at both taxonomic scales, may play a major role in shaping riverine species body size clines. 相似文献
3.
Binzel RP Tholen DJ Tedesco EF Buratti BJ Nelson RM 《Science (New York, N.Y.)》1985,228(4704):1193-1195
The first eclipses between Pluto and its satellite ("Charon") were detected in January and February 1985, confirming the satellite's existence. Eclipses lasting a few hours will now occur at 3.2-day intervals for the next 5 to 6 years and then will cease for about 120 years. Careful observations of these eclipses will allow greatly improved determinations to be made of several physical parameters for the Pluto-Charon system: the diameters of the planet and satellite, the surface albedo distribution on one hemisphere of the planet, the orbit of the satellite, and the mass of the planet and hence its density. Knowledge of the density will provide a constraint on models of Pluto's bulk composition. 相似文献
4.
Filipe?Selau?CarlosEmail author Bruno?Loss?dos?Santos Robson?Andreazza Marino?José?Tedesco Lawrence?Morris Flávio?Anastácio?de?Oliveira Camargo 《Paddy and Water Environment》2017,15(1):133-144
Treated industrial effluents have high levels of nutrients and dissolved organic matter. The irrigation of rice by flooding can increase nutrient uptake and grain yield. Therefore, this study evaluated the nutrient contents in the shoots and grain of the rice crop and also the chemical of the soil after irrigation of the crop with leachate of the treated industrial effluent. A greenhouse experiment was conducted using pots filled with 20 kg of soil in a randomized block design with three replications. The treatments consisted of control (irrigation with distilled water) and four concentrations of the leachate (25, 50, 75, and 100 %) for irrigation. At the end of the experiment, the nutrient contents in tissues of rice plants, sterility of spikelets, and grain mass were evaluated. Results showed that irrigation with the leachate at 25 % content increased the macro- and micronutrients’ concentrations in the shoot biomass and grain, except for potassium and iron. Irrigation with the industrial leachate decreased tillering and grain yield; however, it increased chlorophyll content, sterility of spikelets, and sodium intake at this leachate concentration. The potassium and sodium levels and the electrical conductivity values of soils irrigated with treated industrial leachate were increased. The use of the treated leachate from industrial effluents is an alternative that reuses the nutritional load, but the volume of leachate should be limited and monitored to prevent the sodicity in the soil and problemsdue to eutrophication. 相似文献
5.
Tedesco D Domeneghini C Sciannimanico D Tameni M Steidler S Galletti S 《Journal of veterinary medicine. A, Physiology, pathology, clinical medicine》2004,51(2):85-89
Silymarin, a standardized extract from Silybum marianum seed, is a natural hepatoprotector used for the treatment of liver diseases in man. The aim of this study was to investigate its safety and efficacy in periparturient dairy cows. Ten treated and 10 control pregnant dairy cows were paired by parity, body condition score (BCS), health condition and previous milk production. Treatment consisted of daily 10 g per animal of silymarin extract administered as oral drenches, from 10 days prior to the calving date to 15 days after calving. Blood samples and liver biopsies were taken from each animal at 7 and 30 days after calving. Hepatic functions were evaluated by assay of plasma beta-hydroxybutyrate (BHBA), total cholesterol, high-density lipoproteins, low-density lipoproteins, triglyceride and total bilirubin. The histological aspect of the liver was assessed in biopsies. Clinical chemistry values were similar for both groups and effects at different times (day 7 versus day 30; P < 0.05) were attributed to physiological variations in periparturient cows. Histology showed fat accumulation in the liver of both groups, as it is expected in periparturient dairy cows. In treated cows, fat-rich hepatocytes were observed near the central vein. These observations suggest that, at the used dosage, S. marianum extract has no adverse effect on the liver of lactating cows, and presents no objective evidence for a hepatoprotective effect in this species. 相似文献
6.
Calorie restriction promotes mitochondrial biogenesis by inducing the expression of eNOS 总被引：2，自引：0，他引：2
Nisoli E Tonello C Cardile A Cozzi V Bracale R Tedesco L Falcone S Valerio A Cantoni O Clementi E Moncada S Carruba MO 《Science (New York, N.Y.)》2005,310(5746):314-317
Calorie restriction extends life span in organisms ranging from yeast to mammals. Here, we report that calorie restriction for either 3 or 12 months induced endothelial nitric oxide synthase (eNOS) expression and 3',5'-cyclic guanosine monophosphate formation in various tissues of male mice. This was accompanied by mitochondrial biogenesis, with increased oxygen consumption and adenosine triphosphate production, and an enhanced expression of sirtuin 1. These effects were strongly attenuated in eNOS null-mutant mice. Thus, nitric oxide plays a fundamental role in the processes induced by calorie restriction and may be involved in the extension of life span in mammals. 相似文献
7.
Filipe Selau Carlos Naihana Schaffer Robson Andreazza Lawrence A Morris Marino José Tedesco Cácio Luiz Boechat 《Communications in Soil Science and Plant Analysis》2018,49(3):319-333
Irrigation with treated wastewaters can improve nutrient levels and yield of crops planted on degraded soils. This study evaluated how irrigation with treated industrial wastewater affected biomass production and nutrition of maize plants and physio-chemical properties of a degraded soil. The experiment was conducted in a greenhouse using PVC columns. Treatments consisted of 8 treatments irrigated with clean water and increasing doses of N and P, and 8 treatments with 4 proportions of wastewater irrigation (25%, 50%, 75% and 100% v/v). In general, maize biomass did not differ between irrigation water sources. Differences were largely associated with N nutrition. We observed increases in concentrations of N, P, K, S, Mn, Na, Cu, and Zn in tissue of maize under irrigation with wastewater. The addition of treated wastewater increased the P and Na concentrations, and EC values in the soil without affecting clay dispersion in water. An associated economic analysis indicated that wastewater irrigation would not be economically feasible without including environmental benefits. In southern Brazil, the proportion of irrigation water that is wastewater should not exceed 50%. 相似文献
8.
Renata G. Frederico Murilo S. Dias Céline Jézéquel Pablo A. Tedesco Bernard Hugueny Jansen Zuanon Gislene Torrente-Vilara Hernan Ortega Max Hidalgo Koen Martens Javier Maldonado-Ocampo Thierry Oberdorff 《水产资源保护:海洋与淡水生态系统》2021,31(12):1158-1166
- The Amazon basin has been subjected to extreme climatic events and according to climate change projections this hydrosystem could face changes in the natural dynamic of flood cycles that support the feeding and reproduction of many fish species, threatening aquatic biodiversity.
- Protected areas (PAs) are the main tools used to safeguard the biodiversity in the long term; however, they are fixed areas that could be subject to climate change, questioning their future efficiency in protecting biodiversity.
- The Amazon basin currently benefits from a relatively high level of protection as 52% of its catchment area is under the form of true PAs or indigenous lands. However, the capacity of these PAs to protect freshwater biodiversity remains unclear as they have generally been assessed with little regard to freshwater ecosystems and their hydrological connectivity. Here, the aim was to evaluate the effectiveness of PAs in representing the Amazon fish fauna under current and future climatic conditions.
- A macroecological approach was used to estimate the minimum size of the geographical range needed by each species to achieve long-term persistence, by a combined function of range size and body size, two ecological traits known to influence species extinction risk.
- In future the Amazon basin could risk losing 2% of its freshwater fish fauna owing to unsuitable climatic conditions, with a further 34% adversely affected. The present Amazon network of PAs will cover the minimum required range for species persistence for more than 60% of the freshwater fish species analysed under the future climate scenario. However, more than 25% of the future susceptible species are currently concentrated in large tributaries and in the central-lower Amazon floodplain where few PAs occur, highlighting the lack of appropriate conservation actions for these specific water bodies.
9.
Use of Ozonization for the Treatment of Dye Wastewaters Containing Rhodamine B in the Agate Industry
Machado Ênio Leandro de Sales Dambros Vagner Kist Lourdes Teresinha Alcayaga Lobo Eduardo Alexis Tedesco Solange Bosio Moro Celso Camilo 《Water, air, and soil pollution》2012,223(4):1753-1764
The industrial processing of precious stones is a source of revenue for several Brazilian towns, especially in the state of
Rio Grande do Sul. Given the growing number of small-sized companies that process precious stones, wastewater production is
inevitable and is a cause for concern inasmuch as preservation of nature is considered. The present study investigates the
detoxification of the wastewater produced by the process of rhodamine B dyeing using oxidation processes. Ozonization (O3), ultraviolet irradiation (UV), and O3/UV methods were assessed. Some of the parameters used to measure the efficiency of the analyzed treatments included COD,
ecotoxicity (Daphnia magna), cytotoxicity, and genotoxicity assays (Allium cepa assays). Results show predominance of negative and local environmental impacts, which are reversible in more than 70% of
cases. The major proposed reversibility measures were the change in the process layout and dye wastewater segregation. Among
the analyzed methods, ozonization proved to be more efficient in decolorization, with 60 min of treatment, pH = 9 and dosage
of 5.705 mg O3/mg of rhodamine B. A pseudo first-order reaction, with a kinetic constant of 7.5 × 10−2 min−1, was observed. The cytotoxic and genotoxic effects were assessed for both raw and treated wastewaters. Despite complete decolorization,
cytotoxicity and genotoxicity assays revealed an EC50 of 28.6, in addition to chromosome aberrations in 40% of dividing cells for the treated wastewater. 相似文献
10.
Tedesco EF 《Science (New York, N.Y.)》1979,203(4383):905-907
The lightcurves of the asteroids 49 Pales and 171 Ophelia bear a striking resemblance to those of eclipsing binary stars. This evidence suggests that these asteroids are binary objects. Asteroids belonging to the Themis dynamical family have unusual lightcurves, possibly due to satellite events; these unusual lightcurves suggest that multiple objects may be formed during the disruption of asteroids in collisional events. 相似文献