Author
Alfred M. Mayer
Other affiliations: Boyce Thompson Institute for Plant Research
Bio: Alfred M. Mayer is an academic researcher from Hebrew University of Jerusalem. The author has contributed to research in topics: Catechol oxidase & Botrytis cinerea. The author has an hindex of 40, co-authored 149 publications receiving 9013 citations. Previous affiliations of Alfred M. Mayer include Boyce Thompson Institute for Plant Research.
Papers published on a yearly basis
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TL;DR: This work has focused on more recent reports on the occurrence of laccase and its functions in physiological development and industrial utility and the reports of molecular weights, pH optima, and substrate specificity are extremely diverse.
1,309 citations
TL;DR: Two main groups of plant polyphenol oxidases are recognized: the catecholoxidases and the laccases: their purification, subcellular location and protein properties are described.
1,211 citations
TL;DR: The more recent reports on polyphenol oxidase in plants and fungi are reviewed and many details about structure and probably function of PPO have been revealed, but some of the basic questions raised over the years remain to be answered.
938 citations
TL;DR: In this paper, the authors summarized progress in the plant polyphenol oxidases in the period 1978-1986 and reviewed the results of laccases and catechol oxidase.
731 citations
TL;DR: In this article, the authors compared the performance of manometric, polarographic, chronometric, and spectrophotometric methods for the determination of catechol oxidase activity.
496 citations
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TL;DR: Copper sites have historically been divided into three classes based on their spectroscopic features, which reflect the geometric and electronic structure of the active site: type 1 or blue copper, type 2 (T2) or normal copper, and type 3 (T3) or coupled binuclear copper centers.
Abstract: Copper is an essential trace element in living systems, present in the parts per million concentration range. It is a key cofactor in a diverse array of biological oxidation-reduction reactions. These involve either outer-sphere electron transfer, as in the blue copper proteins and the Cu{sub A} site of cytochrome oxidase and nitrous oxide redutase, or inner-sphere electron transfer in the binding, activation, and reduction of dioxygen, superoxide, nitrite, and nitrous oxide. Copper sites have historically been divided into three classes based on their spectroscopic features, which reflect the geometric and electronic structure of the active site: type 1 (T1) or blue copper, type 2 (T2) or normal copper, and type 3 (T3) or coupled binuclear copper centers. 428 refs.
3,241 citations
TL;DR: The range of biological activities of essential oils and their constituents is reviewed, their toxicity and proposed mode-of-action in insects; their potential health and environmental impacts as crop protectants; and commercialization of pesticides based on plant essential oils are reviewed.
2,269 citations
TL;DR: Comparative genomic approaches were developed to systematically identify both miRNAs and their targets that are conserved in Arabidopsis thaliana and rice, and the expression of miR395, the sulfurylase-targeting miRNA, increases upon sulfate starvation, showing that miRNAAs can be induced by environmental stress.
2,217 citations
TL;DR: The fact that laccases only require molecular oxygen for catalysis makes them suitable for biotechnological applications for the transformation or immobilization of xenobiotic compounds.
Abstract: Laccases of fungi attract considerable attention due to their possible involvement in the transformation of a wide variety of phenolic compounds including the polymeric lignin and humic substances. So far, more than a 100 enzymes have been purified from fungal cultures and characterized in terms of their biochemical and catalytic properties. Most ligninolytic fungal species produce constitutively at least one laccase isoenzyme and laccases are also dominant among ligninolytic enzymes in the soil environment. The fact that they only require molecular oxygen for catalysis makes them suitable for biotechnological applications for the transformation or immobilization of xenobiotic compounds.
1,925 citations
TL;DR: It is suggested that a large number of miRNAs and other small regulatory RNAs are encoded by the Arabidopsis genome and that some of them may play important roles in plant responses to environmental stresses as well as in development and genome maintenance.
Abstract: MicroRNAs (miRNAs) and short interfering RNAs (siRNAs) are small noncoding RNAs that have recently emerged as important regulators of mRNA degradation, translational repression, and chromatin modification. In Arabidopsis thaliana, 43 miRNAs comprising 15 families have been reported thus far. In an attempt to identify novel and abiotic stress regulated miRNAs and siRNAs, we constructed a library of small RNAs from Arabidopsis seedlings exposed to dehydration, salinity, or cold stress or to the plant stress hormone abscisic acid. Sequencing of the library and subsequent analysis revealed 26 new miRNAs from 34 loci, forming 15 new families. Two of the new miRNAs from three loci are members of previously reported miR171 and miR319 families. Some of the miRNAs are preferentially expressed in specific tissues, and several are either upregulated or downregulated by abiotic stresses. Ten of the miRNAs are highly conserved in other plant species. Fifty-one potential targets with diverse function were predicted for the newly identified miRNAs based on sequence complementarity. In addition to miRNAs, we identified 102 other novel endogenous small RNAs in Arabidopsis. These findings suggest that a large number of miRNAs and other small regulatory RNAs are encoded by the Arabidopsis genome and that some of them may play important roles in plant responses to environmental stresses as well as in development and genome maintenance.
1,885 citations