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21.
Sébastien Gogo Christophe Guimbaud Fatima Laggoun-Défarge Valéry Catoire Claude Robert 《Journal of Soils and Sediments》2011,11(4):545-551
Purpose
CH4 emissions from peatlands are space and time dependent. The variety of efflux routes contributes to these variabilities. CH4 bubbling remains difficult to investigate since it occurs on a timescale of seconds. The aims of this study were to use for the first time the recently built infrared high-resolution spectrometer, SPectrometre Infra-Rouge In situ Troposphérique to (1) measure in situ CH4 fluxes in natural and artificial peatland plot and (2) observe online bubbling events with quantification of CH4 emission fluxes corresponding to this very sudden degassing event. 相似文献22.
Castral TC Matos AP Monteiro JL Araujo FM Bondancia TM Batista-Pereira LG Fernandes JB Vieira PC da Silva MF Corrêa AG 《Journal of agricultural and food chemistry》2011,59(9):4822-4827
The fall armyworm Spodoptera frugiperda is a polyphagous pest that causes important damage in different regions of America and mainly affects corn crops in both tropical and subtropical areas. Currently, control relies on both transgenic plants and/or chemical pesticides. In this work we describe the preparation of an indexed combinatorial library of amides and its toxic effect by contact against S. frugiperda . (E)-1-(1-Piperidinyl)-3-[4-(trifluoromethoxy)phenyl]-2-propen-1-one was the most active compound with an LD(50) = 0.793 μg mg(-1) of larva. This amide was also evaluated by ingestion and at the lowest concentration (1 mg kg(-1)) achieved 83.3% mortality. 相似文献
23.
Asma Ait Said Ahmed Oukabli Fatima Gaboun Marie Hélène Simard Cherkaoui El Modafar 《Genetic Resources and Crop Evolution》2013,60(3):927-938
In this paper, we report on morphological diversity, ecology and flowering phenological records of an endangered and an endemic species of Morocco Pyrus mamorensis Trab. For this study, a survey was undertaken in North-Western Morocco (Mamora forest and Zaër region) whereby 67 accessions of P. mamorensis were sampled. A set of 33 genotypes of Pyrus spp. from the international collection INRA-Angers (France) of the genus Pyrus were also analyzed. The variability of the total of 100 accessions was assessed by twenty-six characters including fourteen qualitative and twelve quantitative traits. The results demonstrated high levels of morphological variation in the sampled accessions of P. mamorensis and established the relationships among the local germplasm using the UPGMA cluster analysis and the factorial discriminant analysis. Furthermore, we were able to distinguish three types of flowering in the Mamora forest: early, intermediate and late flowering type. Otherwise, the UPGMA classification comparing local accessions of P. mamorensis to the international collection led to the formation of four major groups showing the closest correspondence to their geographical origins: (1) The North African species represented by P. mamorensis, (2) The East Asian pea species, (3) The West Asian species and (4) The European species. These findings suggest the importance of implementing a conservation strategy preserving the genetic resources of wild pear in North-Western Morocco. 相似文献
24.
Jamal Sawwan Rida A. Shibli Ihsan Swaidat Monther Tahat 《Journal of plant nutrition》2013,36(6):759-771
Interactive effects of phosphorus (P) with in vitro‐induced water deficit (using sorbitol and mannitol) were studied on African violet (Saintpaulia ionantha) whole‐plant microculture. Sorbitol and mannitol significantly reduced (more negative) the cell sap osmotic potential. Increased P was very effective in increasing (less negative) the osmotic potential of cell sap under the imposed water deficit treatments. On the other hand, induced water deficit significantly reduced shoot growth (shoot height and dry mass), and root number and length, whereas P mitigated these adverse effects and improved shoot and root growth. Cultures exposed to water deficit at 150mM sorbitol and mannitol experienced some physiological disorders (about 10% shoot tip browning, 15% stem basal‐end browning) and 20% chlorosis. Physiological disorders and chlorosis were totally mitigated with increased P to 1.0 or 2.0 mM. Phosphorus concentration in shoot tissues was decreased with water deficit in the medium and enhanced by elevated P in the medium. Ex vitro survival percentages increased in plantlets that experienced in vitro water deficit with sorbitol and mannitol at 50 to 100 mM and P at 1.0 to 2.0 mM. We conclude that P is a key factor to regulate cell osmotic potential and growth under in vitro induced water deficit. On the other hand, microculture level is a very effective alternative for the study of plant response and tolerance to water deficit and its interaction with nutrient availability in the root zone. 相似文献
25.
Samira Gilanchi Banafshe Esmaeilzade Akram Eidi Mahmood Barati Soraya Mehrabi Fatima Moghani Ghoroghi Maliheh Nobakht 《Iranian Biomedical Journal》2014,18(3):136-142
Background: The seladin-1 (selective Alzheimer disease indicator-1), also known as DHCR24, is a gene found to be down-regulated in brain region affected by Alzheimer disease (AD). Whereas, hair follicle stem cells (HFSC), which are affected in with neurogenic potential, it might to hypothesize that this multipotent cell compartment is the predominant source of seladin-1. Our aim was to evaluate seladin-1 gene expression in hair follicle stem cells. Methods: In this study, bulge area of male Wistar rat HFSC were cultured and then characterized with Seladin-1 immunocytochemistry and flow cytometry on days 8 to 14. Next, 9-11-day cells were evaluated for seladin-1 gene expression by real-time PCR. Results: Our results indicated that expression of the seladin-1 gene (DHCR24) on days 9, 10, and 11 may contribute to the development of HFSC. However, the expression of this gene on day 11 was more than day 10 and on 10th day was more than day 9. Also, we assessed HFSC on day 14 and demonstrated these cells were positive for β-ш tubulin, and seladin-1 was not expressed in this day. Conclusion: HFSC express seladin-1 and this result demonstrates that these cells might be used to cell therapy for AD in future. Key Words: Seladin-1 (selective Alzheimer disease indicator-1), Alzheimer disease (AD), Hair follicle stem cells 相似文献
26.
Fatima Amat-Trigo Demetra Andreou Phillipa K. Gillingham J. Robert Britton 《Fish and Fisheries》2023,24(1):187-195
Behavioural thermoregulation enables ectotherms to access habitats providing conditions within their temperature optima, especially in periods of extreme thermal conditions, through adjustments to their behaviours that provide a “whole-body” response to temperature changes. Although freshwater fish have been detected as moving in response to temperature changes to access habitats that provide their thermal optima, there is a lack of integrative studies synthesising the extent to which this is driven by behaviour across different species and spatial scales. A quantitative global synthesis of behavioural thermoregulation in freshwater fish revealed that across 77 studies, behavioural thermoregulatory movements by fish were detected both vertically and horizontally, and from warm to cool waters and, occasionally, the converse. When fish moved from warm to cooler habitats, the extent of the temperature difference between these habitats decreased with increasing latitude, with juvenile and non-migratory fishes tolerating greater temperature differences than adult and anadromous individuals. With most studies focused on assessing movements of cold-water salmonids during summer periods, there remains an outstanding need for work on climatically vulnerable, non-salmonid fishes to understand how these innate thermoregulatory behaviours could facilitate population persistence in warming conditions. 相似文献
27.
28.
Fatima Maria de Souza Moreira Teotonio Soares de Carvalho José Oswaldo Siqueira 《Biology and Fertility of Soils》2010,46(8):771-779
The aim of this study was to evaluate the effects of lime, fertilizers, mycorrhizal fungi, and selected rhizobia strains on the growth of four woody legume species, Albizia lebbeck (L.) Benth., Enterolobium contortisiliquum (Vell.) Morong., Leucaena leucocephala (Lam.) de Wit, and Sesbania virgata (Cav.) Pers. in a low-fertility soil. The experiment was conducted under greenhouse condition in plastic pots (4 kg). Eight treatments and eight replicates per treatment were performed in a completely randomized design. The treatments were: (1) complete treatment (C) (NPK fertilization?+?micronutrients?+?liming?+?MR that is inoculation with mycorrhizal fungi and rhizobia); (2) C minus N (C???N that is as C without the addition of N); (3) C???N???M (as C???N without inoculation with arbuscular mycorrhizal fungi (AMF)); (4) C???N??R (as C???N without inoculation of rhizobia); (5) C???N???liming (as C???N without liming); (6) C???N???micro (as C???N without addition of micronutrients); (7) C???N???P (as C???N without addition of P); (8) control without fertilization, liming, and without inoculation with AMF and rhizobia. After 4 months of growth, we determined the yield of individual plants, nodulation, mycorrhizal colonization, and nutrient contents. Phosphorus was the most limiting nutrient for plant growth, followed by nitrogen. L. leucocephala and S. virgata had the most robust response to the addition of micronutrients and liming, showing an increase in nutrient content, plant height, and root and shoot dry matter. When compared to the single inoculation, the dual inoculation increased growth of all plants, except that of A. lebbeck, which did not respond to either rhizobia or mycorrhizal fungi inoculation. 相似文献
29.
Santiago Mde A Ribeiro FC Mouta-Confort E Nascimento LD Schubach Ade O Madeira Mde F Bertho AL 《Veterinary parasitology》2008,154(3-4):341-346
Flow cytometry employing Leishmania (L.) chagasi (Lc) and L. (Viannia) braziliensis (Lb) antigen was used to establish the differential diagnosis between visceral (VL) and cutaneous leishmaniasis (CL) in dogs. Flow cytometry permitted the detection of Leishmania-specific immunoglobulin G in sera from 19 dogs: nine with CL and 10 with VL. A significant difference in the percentage of positive staining was observed in sera from dogs with CL between the homologous antigen (69% for Lb) and the heterologous antigen (42% for Lc). However, this difference was not significant in sera from dogs with VL (61% for Lb and 73% for Lc). No significant staining was observed in control sera (0.6% for Lb and 0.4% for Lc) consisting of samples from healthy dogs, or in the group with sporotrichosis (1.8% for Lb and 1.5% for Lc), a differential diagnosis of CL. The results suggest that flow cytometry might be useful for the differentiation between CL and VL in dogs, with practical applications in areas where the two infections overlap. 相似文献
30.
de la Sancha Noé U. Boyle Sarah A. McIntyre Nancy E. Brooks Daniel M. Yanosky Alberto Cuellar Soto Ericka Mereles Fatima Camino Micaela Stevens Richard D. 《Landscape Ecology》2021,36(10):2997-3012
Landscape Ecology - The Dry Chaco spans more than 87 million hectares across Argentina, Bolivia, and Paraguay. This unique forest system has experienced extensive loss and fragmentation due to... 相似文献