How geographic and climatic factors affect the adaptation of Douglas-fir provenances to the temperate continental climate zone in Europe     

Niemczyk  Marzena  Chmura  Daniel J.  Socha  Jarosław  Wojda  Tomasz  Mroczek  Piotr  Gil  Wojciech  Thomas  Barb R. 《European Journal of Forest Research》2021,140(6):1341-1361

European Journal of Forest Research - The contribution of Douglas-fir (Df) to European forests is likely to increase as the species is a potential adaptation option to climate change. In this...  相似文献   

The birth of an alternatively spliced exon: 3' splice-site selection in Alu exons     

Lev-Maor G  Sorek R  Shomron N  Ast G 《Science (New York, N.Y.)》2003,300(5623):1288-1291

Alu repetitive elements can be inserted into mature messenger RNAs via a splicing-mediated process termed exonization. To understand the molecular basis and the regulation of the process of turning intronic Alus into new exons, we compiled and analyzed a data set of human exonized Alus. We revealed a mechanism that governs 3' splice-site selection in these exons during alternative splicing. On the basis of these findings, we identified mutations that activated the exonization of a silent intronic Alu.  相似文献   

Ultrahigh-resolution spin-echo measurement of surface potential energy landscapes     

Jardine AP  Dworski S  Fouquet P  Alexandrowicz G  Riley DJ  Lee GY  Ellis J  Allison W 《Science (New York, N.Y.)》2004,304(5678):1790-1793

We demonstrate two approaches that use the recently developed helium spin-echo technique to measure surface potential energy landscapes. For helium-lithium fluoride (100), we use the selective adsorption phenomenon to obtain the complete experimental band structure of atoms in a corrugated surface potential. For carbon monoxide-copper (001), we measure the diffusion-induced energy broadening in the scattered helium beam and extract properties of the adsorbate-substrate potential. The measurements are made possible by the resolution of our new spectrometer, which improves on existing resolution by three orders of magnitude. We show that it is possible to produce benchmark energy landscapes to assist evaluation and development of first-principles theory in the problematic van der Waals/weak chemisorption regime.  相似文献   

Simultaneous detection of potato viruses Y,leafroll, X and S by DAS-ELISA technique with artificial polyvalent antibodies (APAs)     

C. Pérez De San Román  F. J. Legorburu  J. Pascualena  A. Gil 《Potato Research》1988,31(1):151-158

Summary A modification of the double antibody sandwich-enzyme linked immunosorbent assay (DASELISA) was used to try to detect simultaneously PVY, PLRV, PVX and PVS in both leaf and sprout samples, using artificial polyvalent antibodies (APAs). Each virus, singly or in a mixture, was detected with similar sensitivity using either specific antibodies or APAs. The APA for all four viruses is suitable for routine leaf testing, but only the APA for PVY+PVX+PVS is suitable for routine sprout testing.  相似文献   

Changes of pulling-out length and shrinkage ratio in polyester/spandex power net warp knitted fabrics     

Choon Gil Lee 《Fibers and Polymers》2006,7(1):51-56

Power net fabric is one of the highly extensible two-way fabrics. Power net structure shows special characteristics in the wearing of final functional clothes. This research evaluated effects of treatment temperature on proportional extensibility and shrinkage ratio of spandex at a given wale length. As treatment temperature increased, extensibility increased proportionally to the standard length of the sample and the shrinkage ratio in the direction of course and wale increased. The pulling-out length increased proportionally to the standard length of the sample. However it was affected by the effect of treatment time and temperature due to the thermal properties of spandex filament yarn.  相似文献   

Production of L-lactic acid and oligomeric compounds from apple pomace by simultaneous saccharification and fermentation: a response surface methodology assessment     

Gullón B  Garrote G  Alonso JL  Parajó JC 《Journal of agricultural and food chemistry》2007,55(14):5580-5587

The potential of apple pomace for lactic acid production by simultaneous saccharification and fermentation (SSF) was evaluated. The effects of the cellulase to solid ratio (CSR), the liquor to solid ratio (LSR), and the beta-glucosidase to cellulase ratio (BCR) on the kinetics of lactic acid generation were assessed, and a set of mathematical models was developed to reproduce and predict the lactic acid concentration of fermentation broths. Operating at low cellulase and cellobiase charges (1 FPU/g and 0.25 IU/FPU, respectively) and short reaction times (10 h), SSF media containing 27.8 g of lactic acid/L were obtained with a volumetric productivity of 2.78 g/Lh. Material balances showed that the SSF processing of 100 kg of dry apple pomace results in the production of 36.6 kg of lactic acid, 18.3 kg of oligomeric carbohydrates (which can be used as ingredients for functional foods), 8.4 kg of microbial biomass, and 8 kg uronic acids.  相似文献   

The Effects of Stressful Broodstock Handling on Hormonal Profiles and Reproductive Performance of Rhamdia quelen (Quoy & Gaimard) Females     

Auren Benk Soso  Leonardo José Gil Barcellos  Maria José Ranzani‐Paiva  Luiz Carlos Kreutz  Rosmari Mezzalira Quevedo  Marina Lima  Leonardo Bolognesida Silva  Filipe Ritter  Alexandra Calliari Bedin  Jovani Antônio Finco 《Journal of the World Aquaculture Society》2008,39(6):835-841

Abstract.— A stressful environment induces cortisol that might affect fish breeding and reproduction. In the present work, which aimed to mimic aquacultural conditions of the jundia (Rhamdia quelen) hatcheries in southern South America, females were submitted to normal or stressful handling and the effects of cortisol on serum levels of 17β‐estradiol (E2) and testosterone (T) were determined. In addition, the effect of stress on reproductive parameters such as eggs and swim‐up fry production was also measured. Eight females from a group submitted to stressful handling (SH) conditions and eight females from a group with normal handling (NH) conditions were captured for blood sampling at D 0 and at D 1, 10, 20, 30, and 40 of the experiment. A typical cortisol response was observed in the SH females group in that they presented higher cortisol level in contrast to the NH female group, in all days sampled, except at D 0. In the 10th and 20th d, the E2 levels were lower in SH females, but cortisol levels were higher, suggesting an effect of cortisol on E2 production and/or release. Stressful handling appeared to affect both the number and the quality of the gametes because a lower number of oocytes was stripped from SH females, and from SH fertilized eggs, a lower number of viable swim‐up fry was obtained to be transferred to earthen larviculture ponds. Taken together, the results indicated that stressful handling of broodstock impairs R. quelen reproduction.  相似文献   

Protected areas and native freshwater bivalves are not in the same place in south-east Brazil     

Igor Christo Miyahira  Maria Cristina Dreher Mansur  Luiz Eduardo Macedo de Lacerda  Isabela Cristina Brito Gonçalves  Glauco Gil Sant'Anna  Sonia Barbosa dos Santos 《水产资源保护:海洋与淡水生态系统》2023,33(1):102-114

1. Bivalves are important components of freshwater ecosystems; however, they are also one of the most threatened animal groups, especially members of the order Unionida. The main threats to freshwater bivalves are habitat modification and invasive species. Protected areas are a common way to minimize impacts and preserve native species, but they are rarely designated with a focus on freshwater invertebrates.
2. The main goal of this article was to describe the distribution of freshwater bivalves in the state of Rio de Janeiro, and the relationship between these species and bioclimatic areas, land use and protected areas.
3. Five native and two invasive bivalve species have been reported in Rio de Janeiro. They occur mainly in bioclimatic areas related to the Paraíba do Sul River and Campista Lowlands. The few records of bivalves inside protected areas are in areas of sustainable use that offer a lower level of protection, and frequently in sympatry with invasive bivalves.
4. Thus, the established protected areas in Rio de Janeiro are not adequately effective for freshwater bivalve conservation, and some species remain under threat even within them. Freshwater bivalves thus remain largely unprotected in the state.
5. The development of new protected areas and management plans should consider other faunal groups that are usually ignored, such as freshwater bivalves, to achieve more inclusive and effective protection.

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