Anatomical variation of teakwood from unmanaged mature plantations in East Timor     

Sofia Cardoso  Vicelina B. Sousa  Teresa Quilhó  Helena Pereira 《Journal of Wood Science》2015,61(3):326-333

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Anthocyanins present in selected tropical fruits: acerola, jambolão, jussara, and guajiru     

de Brito ES  de Araújo MC  Alves RE  Carkeet C  Clevidence BA  Novotny JA 《Journal of agricultural and food chemistry》2007,55(23):9389-9394

Many tropical fruits are rich in anthocyanins, though limited information is available about the characterization and quantification of these anthocyanins. The identification and quantification of anthocyanin pigments in four tropical fruits were determined by HPLC-MS/MS. Fruits studied included acerola (Malphigia emarginata), jussara (Euterpe edulis), jambol?o (Syzygium cumini), and guajiru (Chrysobalanus icaco). All four fruits were found to contain anthocyanin pigments. Anthocyanidin backbones included cyanidin, delphinidin, peonidin, pelargonidin, petunidin, and malvidin. Guajiru contained several acylated forms, while acerola, jussara, and jambol?o contained only nonacylated glycosides. These results demonstrate that these tropical fruits are rich in anthocyanins and that the anthocyanins are widely ranging in anthocyanidin backbone, glycosylation, and acylation.  相似文献   

户用分布式光伏对农户收入的影响——以中部地区Y县为例     

剌美香  周力  刘宗志  王兴华 《农业现代化研究》2022,43(3):493-503

户用分布式光伏对农户收入影响具有长期性,如何发挥分布式光伏在乡村振兴战略中的作用需进一步探索。本文以户用分布式光伏为例,利用中部地区Y县2014—2019年农户追踪数据,运用双重差分法,分析户用分布式光伏对农户收入的影响,探讨户用分布式光伏对农户收入影响的作用机制。结果表明,2014—2019年农户收入大幅度提升,其中建光伏农户的人均收入增长幅度大于未建光伏农户,户用分布式光伏使农户人均收入提高25.4%,其中经营性收入、财产性收入分别提高74.4%和444.5%,而工资性收入降低45.3%。户用分布式光伏是通过减少非农劳动时间和缩短非农就业空间距离降低农户工资性收入,增加经营性收入,从而影响人均收入。进一步分析发现,户用分布式光伏对非中心村农户的工资性收入和经营性收入影响大于中心村农户,劳动力能力越强的农户经营性收入上升幅度越大,工资性收入下降幅度越小。因此,建议统一维护光伏设施,促进劳动力要素有效配置;并依据劳动能力差异分层分配股份,降低劳动能力强的农户对政府补贴的依赖;另外,创新光伏产业发展模式,拓宽光伏产业增收渠道。  相似文献   

Vegetation restoration is associated with increasing forest width     

Londe  Vinícius  Messias  Maria Cristina Teixeira Braga  de Sousa  Hildeberto Caldas 《New Forests》2021,52(1):129-144

New Forests - Monitoring and assessment reveal important information about restoration areas and can also be useful for understanding ecological processes such as succession and species-area...  相似文献   

Evaluation of hepatitis E virus infection between different production systems of pigs in Brazil     

Marconni Victor da Costa Lana  Noemi Rovaris Gardinali  Raquel Aparecida Sales da Cruz  Letícya Lerner Lopes  Gustavo Sousa Silva  João Garcia Caramori Júnior  Anderson Castro Soares de Oliveira  Marcos de Almeida Souza  Edson Moleta Colodel  Amauri Alcindo Alfieri  Caroline Argenta Pescador 《Tropical animal health and production》2014,46(2):399-404

The objectives of this study were to (1) investigate the occurrence of hepatitis E virus (HEV) in pigs from large-scale and family-scale farms, (2) genetically characterize the strains isolated, and (3) study the pathogenesis of swine HEV infection via immunohistochemistry. A total of 50 pigs from 10 farms in Mato Grosso State, Brazil were divided according to type of production system into either large-scale farms (n?=?5) or family-scale farms (n?=?5). Samples of liver, gallbladder, small and large intestines, bile, and feces from the pigs were analyzed by nested PCR with primers targeting the ORF2 region of HEV and by immunohistochemistry. Of the eight HEV-positive samples from pigs of family-scale farms, phylogenetic analysis revealed that seven of the swine HEV isolates clustered with subtype 3b of genotype 3 and one isolate was categorized with subtype 3 f. The HEV antigen was detected mainly in the small intestine samples from family-scale farms, suggesting an early stage HEV infection. HEV was not detected in the samples of pigs from large-scale farms, reinforcing the need for additional studies to evaluate the risk of transmission of HEV to humans from pigs from family-scale farms in Mato Grosso State.  相似文献   

Reserve effect of a small North-East Atlantic marine protected area (Arrábida,Portugal) on soft-sediment fish species     

Lucas Martínez-Ramírez  C. Robert Priester  Inês Sousa  Karim Erzini  David Abecasis 《水产资源保护:海洋与淡水生态系统》2021,31(7):1584-1595

1. The implementation of marine protected areas (MPAs) has been widely used as a tool to manage and conserve marine resources and services. Yet, to date, the reserve effect is still weakly evaluated, particularly for soft-sediment habitats.
2. The Arrábida MPA, considered as a biodiversity hotspot, was fully established in 2009 on the west coast of Portugal and is characterized by large expanses of soft-sediment habitats. This MPA was established to protect biodiversity and to ensure the livelihood of the local small-scale fisheries community.
3. Beyond before–after-control–impact (BACI) analyses were carried out on catch data (abundance and biomass) of 351 trammel net sets from experimental fishing campaigns (2007–2019) to study the reserve effect on demersal fish populations.
4. The results show a declining trend in abundance inside and outside the protected area, with significant positive effects only found for undersize commercial species and Solea senegalensis, and a general increase in fish species total length. Despite the lack of any obvious reserve effect, the increase in fish length can be considered as a first sign.
5. Anthropogenic pressures are generalized around the area, and transgressions of the restrictions are frequently observed inside the no-take zone. These can, among other aspects, delay or prevent the expected reserve effects. Therefore, enforcement and/or modification of the spatial plan must be incentivized to achieve the goals of the MPA.

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Long-term nutritional effects on the primary liver and kidney metabolism in rainbow trout (Oncorhynchus mykiss). II. Adaptive response of glucose 6-phosphate dehydrogenase activity to high-carbohydrate/low-protein and high-fat/non-carbohydrate diets     

M. J. SÁNCHEZ-MUROS  L. GARCÍA-REJÓN  J. A. LUPIÁÑEZ  M. DE LA  HIGUERA 《Aquaculture Nutrition》1996,2(4):193-200

The influence of long-term administration of high-carbohydrate/low-protein and high-fat/non-carbohydrate diets were studied in relation to kinetic behaviour of glucose 6-phosphate dehydrogenase in liver and kidney of rainbow trout. In all cases studied, the saturation curves of these enzyme showed typical hyperbolic kinetics without evidence of sigmoidicity. After 30 days of feeding with a high-fat diet (170 g kg^?1), there was a significant decrease in V_max and specific activity (45%) as well as catalytic efficiency (39%) without changes in K_m or activity ratio of hepatic glucose 6-phosphate dehydrogenase. These changes agree more with a clearly decreased cell concentration than with an inhibition of the pre-existing enzyme. The administration of a high-carbohydrate diet (60 g kg^?1), contrary to what was previously thought, decreased V_max by 21% and specific activity and catalytic efficiency by 30%, without significant changes in the other kinetic parameters of the hepatic enzyme. The kinetic behaviour under these nutritional conditons was due to the rejection of this diet by the fish and thus could be considered a low-feeding situation. On the other hand, no variations in the kinetics of renal glucose 6-phosphate dehydrogenase were found, clearly demonstrating that in this organ, the pentosephosphate pathway showed no adaptive response related to fattyacid and other lipid synthesis. The activity of the renal enzyme was consistently half that of the hepatic enzyme.  相似文献   

Reply     

LA CORNER  PR WOOD  JS ROTHEL 《Australian veterinary journal》1991,68(6):218-219

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Aspartic Proteinase Members Secreted by the Ruminant Placenta: Specificity of Three Radioimmunoassay Systems for the Measurement of Pregnancy-associated Glycoproteins   总被引：1，自引：0，他引：1  

ZS Perényi  O Szenci  PV Drion  H Banga-Mboko  NM Sousa  B El Amiri  JF Beckers 《Reproduction in domestic animals》2002,37(6):324-329

Pregnancy‐associated glycoproteins (PAGs) isolated from the placenta of various ruminant species are enzymatically inactive members of the aspartic proteinase family. The measurement of these proteins in the maternal blood can be a good indicator of the presence of a live embryo. As certain aspartic proteinases are present in biological fluids in physiological and pathological conditions at various concentrations, it was necessary to determine the specificity of three radioimmunoassay (RIA) systems currently used for the detection of PAG molecules. Commercially available members of the aspartic proteinase family like pepsinogen, pepsin, chymosin, rennet, cathepsin D and renin were tested in a wide concentration range (10 ng/ml – 1 mg/ml). Pepsinogen cross‐reacted in RIA 1, RIA 2 and RIA 3 over 1 mg/ml, 50 μg/ml and 500 μg/ml concentrations, respectively. In the presence of pepsin, cross‐reaction was observed in RIA 1, RIA 2 and RIA 3 over 1 mg/ml, 500 μg/ml and 1 mg/ml concentrations, respectively. Chymosin and rennet could cross‐react in RIA 2 and RIA 3, while renin and cathepsin D did not decrease the binding of the tracer to antisera more, than that of the minimal detection limit. As the plasma/serum concentrations of the examined aspartic proteinases reported in the literature were outside the concentration range where cross‐reaction was observed, it can be concluded that these RIA systems were specific for the detection of PAGs in biological fluids.  相似文献   

The 5-MinuteVeterinary Consult: Canine and Feline     

LA Abraham 《Australian veterinary journal》2002,80(1):56-56

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