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557 results on '"Nijkamp, H."'

1. Oil spills and sea turtles: documented effects and considerations for response and assessment efforts

Author

Wallace, BP, Stacy, BA, Cuevas, E, Holyoake, C, Lara, PH, Marcondes, ACJ, Miller, JD, Nijkamp, H, Pilcher, NJ, Robinson, I, Rutherford, N, and Shigenaka, G

Subjects
Zoology, QL1-991, Botany, QK1-989
Abstract

Hydrocarbon (i.e. oil) extraction, transport, consumption, and pollution occur daily in marine environments, threatening vulnerable natural resources, habitats, and biodiversity. However, threats of episodic oil spills to imperiled marine species are not as well-studied as more acute, readily apparent threats such as incidental capture in fisheries and habitat degradation. We performed a global review of spill incident databases to evaluate reported effects of oil spills on sea turtles, which are flagship species of the world’s oceans. Our goals were to (1) summarize available information about oil spills and their effects on sea turtles; (2) identify major knowledge gaps; and (3) provide recommendations related to oil spills and sea turtles for managers, researchers, and conservation groups around the world. Over 2000 oil spill incidents of variable magnitude (range: ~20 to >1 million barrels) have occurred worldwide in the past 60 yr in areas where sea turtles are found, but resulting effects on sea turtles have been reported in less than 2% of those incidents. Further, evidence indicates that most effects are related to heavy external oiling, while chemical effects of oil exposure have not been well defined. We recommend that, where available, resources be prioritized to document co-occurrence of turtles and oil, the degree and nature of oil exposure, and mortality and reproductive losses to individual sea turtles and their populations caused by spills and spill response activities. These data will best inform assessments of the extent and magnitude of adverse effects of oil spills on sea turtles.

Published
2020
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5. Oil spills and sea turtles: Documented effects and considerations for response and assessment efforts

Author

Wallace, B.P., Stacy, B.A., Cuevas, E., Holyoake, C., Lara, P.H., Marcondes, A.C.J., Miller, J.D., Nijkamp, H., Pilcher, N.J., Robinson, I., Rutherford, N., Shigenaka, G., Wallace, B.P., Stacy, B.A., Cuevas, E., Holyoake, C., Lara, P.H., Marcondes, A.C.J., Miller, J.D., Nijkamp, H., Pilcher, N.J., Robinson, I., Rutherford, N., and Shigenaka, G.

Abstract

Hydrocarbon (i.e. oil) extraction, transport, consumption, and pollution occur daily in marine environments, threatening vulnerable natural resources, habitats, and biodiversity. However, threats of episodic oil spills to imperiled marine species are not as well-studied as more acute, readily apparent threats such as incidental capture in fisheries and habitat degradation. We performed a global review of spill incident databases to evaluate reported effects of oil spills on sea turtles, which are flagship species of the world’s oceans. Our goals were to (1) summarize available information about oil spills and their effects on sea turtles; (2) identify major knowledge gaps; and (3) provide recommendations related to oil spills and sea turtles for managers, researchers, and conservation groups around the world. Over 2000 oil spill incidents of variable magnitude (range: ~20 to >1 million barrels) have occurred worldwide in the past 60 yr in areas where sea turtles are found, but resulting effects on sea turtles have been reported in less than 2% of those incidents. Further, evidence indicates that most effects are related to heavy external oiling, while chemical effects of oil exposure have not been well defined. We recommend that, where available, resources be prioritized to document co-occurrence of turtles and oil, the degree and nature of oil exposure, and mortality and reproductive losses to individual sea turtles and their populations caused by spills and spill response activities. These data will best inform assessments of the extent and magnitude of adverse effects of oil spills on sea turtles.

Published
2020

34. Cloning, nucleotide sequence and expression of the Escherichia coli fabD gene, encoding malonyl coenzyme A-acyl carrier protein transacylase

Author

Verwoert, Ira I.G.S., Verbree, Elizabeth C., Linden, Karin H. van der, Nijkamp, H. John J., and Stuitje, Antoine R.

Subjects
Bacterial genetics -- Research, Escherichia coli -- Genetic aspects, Cloning -- Research, Fatty acids -- Synthesis, Carrier proteins -- Research, Biological sciences
Abstract

Cloning by complementation of heat-sensitive Escherichia coli fabD mutant was carried out on the fabD gene that encodes the malonyl coenzyme A-acyl carrier protein transaylase (MCT). Nucleotide sequencing and gene expression analysis showed fabD gene to be part of an operon together with at least two other genes involved in fatty acid biosynthesis. An allele identified as fabD89 was demonstrated to express a 27 kDa polypeptide in addition to the normal 32 kDa MCT protein.

Published
1992

41. A longevity assurance gene homolog of tomato mediates resistance to Alternaria alternata f. sp. lycopersici toxins and fumonisin [B.sub.1]

Author

Brandwagt, Bas F., Mesbah, Laurent A., Takken, Frank L. W., Laurent, Pascal L., Kneppers, Tarcies J. A., Hille, Jacques, and Nijkamp, H. John J.

Subjects
Plant viruses -- Analysis, Mycotoxins -- Analysis, Plant cells and tissues -- Evaluation, Genetic engineering -- Analysis, Science and technology
Abstract

The phytopathogenic fungus Alternaria alternata f. sp. lycopersici (AAL) produces toxins that are essential for pathogenicity of the fungus on tomato (Lycopersicon esculentum). AAL toxins and fumonisins of the unrelated fungus Fusarium moniliforme are sphinganine-analog mycotoxins (SAMs), which cause inhibition of sphingolipid biosynthesis in vitro and are toxic for some plant species and mammalian cell lines. Sphingolipids can be determinants in the proliferation or death of cells. We investigated the tomato Alternaria stem canker (Asc) locus, which mediates resistance to SAM-induced apoptosis. Until now, mycotoxin resistance of plants has been associated with detoxification and altered affinity or absence of the toxin targets. Here we show that SAM resistance of tomato is determined by Asc-1, a gene homologous to the yeast longevity assurance gene LAG1 and that susceptibility is associated with a mutant Asc-1. Because both sphingolipid synthesis and LAG1 facilitate endocytosis of glycosylphosphatidylinositol-anchored proteins in yeast, we propose a role for Asc-1 in a salvage mechanism of sphingolipid-depleted plant cells.

Published
2000

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