13C and 15N isotopic fractionation in trees, soils and fungi in a natural forest stand and a Norway spruce plantation   总被引：1，自引：0，他引：1  

Bernd Zeller  Claude Brechet  Jean-Paul Maurice  François Le Tacon 《Annals of Forest Science》2007,64(4):419-429

¹⁵N and ¹³C natural abundances of foliage, branches, trunks, litter, soil, fungal sporophores, mycorrhizas and mycelium were determined in two forest stands, a natural forest and a Norway spruce plantation, to obtain some insights into the role of the functional diversity of saprotrophic and ectomycorrhizal fungi in carbon and nitrogen cycles. Almost all saprotrophic fungi sporophores were enriched in ¹³C relative to their substrate. In contrast, they exhibited no or very little shift of δ¹⁵N. Judging from the amount of C discrimination, ectomycorrhizal fungi seem to acquire carbon from their host or from dead organic matter. Some ectomycorrhizal species seem able to acquire nitrogen from dead organic matter and could be able to transfer it to their host without nitrogen fractionation, while others supply their host with ¹⁵N-depleted nitrogen. Moreover ectomycorrhizal species displayed a significant N fractionation during sporophore differentiation, while saprotrophic fungi did not.  相似文献   

Low-intensity,short-duration thermal stimulation during the late phase of incubation alters secondary sex ratio in favour of males     

A. Elmehdawi  M. Hall  P. Skewes  D. Wicker  D. V. Maurice  J. Smith 《British poultry science》2015,56(3):381-388

1. In two experiments, two setters and hatchers, with a capacity of 42 240 eggs each, were used to investigate the effect of low-intensity, short-duration thermal stimuli during the late phase of incubation on hatchability, sex ratio and grow-out performance of broilers under field conditions.

2. Eggs in the test group had the same physical environment as eggs in the control group except that incubation temperature was increased by 0.5°C for 2 h/d above the control group from 18 to 20 d of incubation.

3. Thermal stimulation significantly increased the proportion of males hatched in both experiments. In experiment 2, evaluation at 7 d of age showed that the proportion of males in the test group was still significantly higher than in the control group.

4. In experiment 2, hatch residue was examined and the proportion of unhatched male embryos was significantly greater in the control group than in the test group.

5. Thermal stimulation did not have a significant influence on post-hatch performance of broiler chickens to market age.

6. The results demonstrated that thermal stimulation of 0.5°C for 2 h/d above the control during late incubation shifted the sex ratio at hatch and at 7 d in favour of males. The difference in secondary sex ratio was due to increased survival of male embryos in the test group.  相似文献   

Serologic study of rickettsioses in dromedaries in Chad     

Y Maurice  J F Bares 《Revue d'élevage et de médecine vétérinaire des pays tropicaux》1967,20(4):543-550

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Serological surveys on animal arboviruses in Central Africa (horse sickness, blue tongue, Wesselsbron's disease, Rift Valley fever)     

Y Maurice  A Provost 《Revue d'élevage et de médecine vétérinaire des pays tropicaux》1969,22(2):179-184

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La nouvelle réglementation Vétérinaire fran?aise     

Maurice Panisset 《Canadian journal of veterinary research》1938,2(10):285-288

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What explains tourists’ support for snow leopard conservation in the Annapurna Conservation Area,Nepal?     

Jonathan H. Hanson  Maurice Schutgens  Nabin Baral 《Human Dimensions of Wildlife》2019,24(1):31-45

Wildlife tourism is increasingly important for the conservation of threatened species such as snow leopards. However, what tourists know or value about snow leopards, and to what extent they support the conservation of this species, has received limited empirical attention. This paper investigates tourist knowledge about snow leopards, beliefs and values toward the species, and support for its conservation in the Annapurna Conservation Area of Nepal. Survey data were collected from 406 foreign tourists between March and May 2014. Although knowledge about snow leopards varied among respondents, there was widespread support for their conservation. Knowledge about snow leopards was best explained by education level and environmental organization membership. Improved knowledge about the species, and a variety of intrinsic conservation values, were found to increase tourist support for snow leopard conservation. These results provide important insights to help tailor tourism initiatives to support the conservation of snow leopards.  相似文献   

Prevalence of Taenia solium cysticercosis in pigs entering the food chain in western Kenya     

Lian Francesca Thomas  Leslie Jayne Stevenson Harrison  Philip Toye  William Anson de Glanville  Elizabeth Anne Jesse Cook  Claire Njeri Wamae  Eric Maurice Fèvre 《Tropical animal health and production》2016,48(1):233-238

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Esterase‐mediated resistance to pyrethroids in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) from Central Africa     

Joseph Achaleke  Thibaud Martin  Richard T Ghogomu  Maurice Vaissayre  Thierry Brévault 《Pest management science》2009,65(10):1147-1154

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Colorimetric Evaluation of Mahi-Mahi and Tuna for Biogenic Amines     

Taylor Dole  Stephen Koltun  Shirley M. Baker  Renee M. Goodrich-Schneider  Maurice R. Marshall 《Journal Of Aquatic Food Product Technology》2017,26(7):781-789

The Food and Drug Administration and National Marine Fisheries Services grade tuna and mahi-mahi using trained sensory panels in order to determine the quality of these fish. A major concern with both species is the presence of histamine in the flesh, which can cause scombroid poisoning, a severe illness that can lead to death. Three different assays were examined in an attempt to correlate sample grade with biogenic amine content. The first method, acetic acid Dräger tubes, was only effective in identifying the highest grade (lowest quality) of mahi-mahi. The second method was a bromophenol blue (BPB) colorimetric strip that was sensitive to volatile biogenic amines. The third method was a histamine-specific enzyme-linked immunosorbant assay (ELISA) that detected analytes in the liquid phase. The results of the BPB and ELISA methods showed a correlation between sample grade and biogenic amine content for mahi-mahi. The same correlation was not observed with the tuna samples, likely due to physiological differences between the two species that affect the detection of the analytes.  相似文献   

Host Suitability and Tolerance of Rose Rootstocks to Pratylenchus penetrans     

PengYunliang  MauriceMoens 《云南农业大学学报(自然科学版)》1999,14(Z1):127-127

 One of the most damaging pests of roses, the root lesion nematode Pratylenchus penetrans, is mainly controlled by nematicides.As nematode multiplication and host tolerance vary between rootstock cultivars, the use of P.penetrans resistant rootstocks is an interesting alternative.A method to observe host suitability was developed and considered the development of both plant and nematode population,the variation in the results and the used resources.  相似文献