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排序方式: 共有106条查询结果,搜索用时 15 毫秒
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Juan A. Correa Paloma González Pablo Sánchez Jorge Muñoz María C. Orellana 《Environmental monitoring and assessment》1996,40(1):41-54
This study evaluated the responses of wild, adult plants of Enteromorpha compressa, and their progeny, to various copper concentrations. Experiments were designed to test the hypotheses that: 1) individuals of E. compressa from Caleta Palito, a copper-enriched coastal locality, tolerate higher copper concentrations than those from a place with no history of copper pollution and 2) such copper tolerance is under genetic control and therefore, was an inherited character. Our results indicate that algae which inhabit a copper-enriched environment tolerate higher concentrations of copper than those from waters with low copper concentrations. On the other hand, our results suggest that generalizations regarding heritability of the tolerance to copper do not apply to the Chilean E. compressa, as no differences in growth or rhizoid production were found between the progeny from Caleta Palito and Caleta Zenteno. These findings are an indication that heritability and adaptation may represent alternative strategies used by different populations of the same algal species to tolerate copper. 相似文献
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Beth A. Pletcher Maureen M. Sanz Jerrold S. Schlessel Suphat Kunaporn Carrie McKenna Martin G. Bialer M. Lita Alonso Ann-Leslie Zaslav W. Ted Brown James H. Ray 《黑龙江环境通报》1994,14(10):933-940
Two phenotypically abnormal liveborns in whom trisomy 16 mosaicism was diagnosed prenatally by amniocentesis are described. Analysis of a percutaneous umbilical blood sample in one case revealed a normal chromosomal complement. Ultrasound examinations performed at the time of amniocentesis were normal. Serial sonography during the late second and third trimesters demonstrated progressive intrauterine growth retardation (IUGR) in both fetuses and a cardiac defect in one. At birth, both infants had dysmorphic features and multiple congenital anomalies. Trisomy 16 mosaicism was confirmed postnatally in both infants in skin fibroblasts; however, peripheral blood samples contained only chromosomally normal cells. The two mosaic trisomy 16 cases described in this report, together with the five confirmed cases reported previously, demonstrate the need for caution in the counselling of patients when trisomy 16 mosaicism is diagnosed prenatally in amniotic fluid samples. Such cases potentially can result in the birth of dysmorphic infants with significant birth defects, growth retardation, and possible developmental disabilities. 相似文献
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García-Cambero Jesús Pablo Corpa Cristina Lucena Miguel Angel Méndez Paloma Sierra Pilar Galán-Madruga David Aguayo Sonia 《Environmental science and pollution research international》2021,28(36):49921-49935
Environmental Science and Pollution Research - Diclofenac (DCF), 17-β-estradiol (E2), and 17-α-ethinylestradiol (EE2) are emerging pollutants included in the first watch list agreed by... 相似文献
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Paloma de Almeida Rodrigues Rafaela Gomes Ferrari Luciano Neves dos Santos Carlos Adam Conte Junior 《环境科学学报(英文版)》2019,31(10):205-218
Mercury is an important pollutant, released into aquatic ecosystems both naturally and by anthropogenic action. This element is transferred to aquatic organisms in different ways, causing potential health risks. In addition, mercury can be accumulated by humans, especially through the consumption of contaminated food. This systematic review aims to present mercury pathways, the major routes through which this element reaches the aquatic environment and its transformations until becoming available to living animals, leading to bioaccumulation and biomagnification phenomena. The key biotic and abiotic factors affecting such processes, the impact of mercury on animal and human health and the issue of seafood consumption as a source of chronic mercury contamination are also addressed. A total of 101 articles were retrieved from a standardized search on three databases (PubMed, Emabse, and Web of Science), in addition to 28 other studies not found on these databases but considered fundamental to this review (totaling 129 articles). Both biotic and abiotic factors display fundamental importance in mediating mercurial dynamics, i.e., muscle tropism, and salinity, respectively. Consequently, mercurial contamination in aquatic environments affects animal health, especially the risk of extinction species and also on human health, with methylmercury the main mercury species responsible for acute and chronic symptomatology. 相似文献
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Simon T. Belt Thomas A. Brown Patricia Cabedo Sanz Alba Navarro Rodriguez 《Environmental Chemistry Letters》2012,10(2):189-192
IP25 is a highly branched isoprenoid and an organic geochemical biomarker that is produced by some Arctic sea ice diatoms. IP25 has previously been used in Arctic palaeo sea ice reconstruction studies and as a tracer for studying Arctic food webs. Here,
the molecular structure of IP25 has been confirmed by 1H and 13C NMR spectroscopy following large-scale extraction from marine sediments obtained from the Canadian Arctic and purification
using a combination of open-column and HPLC chromatographic methods. The structure of IP25 was consistent between the three different sampling locations and was identical to that found previously for this biomarker
following synthesis from a closely related highly branched isoprenoid diene. Since this study represents the first structural
characterisation of IP25 in sediments, future analysis of sedimentary IP25 for palaeo Arctic sea ice reconstructions can be carried out with much greater confidence. 相似文献