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Parsing with derivatives: a functional pearl
- In Proceeding of the 16th ACM SIGPLAN international conference on Functional Programming (ICFP ’11). ACM
, 2011
"... We present a functional approach to parsing unrestricted context-free grammars based on Brzozowski’s derivative of regular expres-sions. If we consider context-free grammars as recursive regular ex-pressions, Brzozowski’s equational theory extends without modifi-cation to context-free grammars (and ..."
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Cited by 16 (1 self)
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is either dead on arrival, or it dies after the very next derivative. To eliminate it, we once again exploit laziness and memoization to transliterate an equational theory that prunes such debris into working code. Thanks to this compaction, parsing times become reasonable in practice. We equip
Atlantic salmon and European freshwater pearl
"... mussel populate the rivers of Western and Eastern Europe, as well as eastern North America [27, 63]. In contrast to Atlantic salmon, whose natural habitat extends to the Ural Mountains [37], pearl mussel is not encountered in the northeast part of the Kola Pen insula [64] or east of the Solza River ..."
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mussel populate the rivers of Western and Eastern Europe, as well as eastern North America [27, 63]. In contrast to Atlantic salmon, whose natural habitat extends to the Ural Mountains [37], pearl mussel is not encountered in the northeast part of the Kola Pen insula [64] or east of the Solza River
Parsing with Derivatives A Functional Pearl Matthew
"... We present a functional approach to parsing unrestricted contextfree grammars based on Brzozowski’s derivative of regular expressions. If we consider context-free grammars as recursive regular expressions, Brzozowski’s equational theory extends without modification to context-free grammars (and it g ..."
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on arrival, or it dies after the very next derivative. To eliminate it, we once again exploit laziness and memoization to transliterate an equational theory that prunes such debris into working code. Thanks to this compaction, parsing times become reasonable in practice. We equip the functional programmer
Pearls Putting Fungi to Work: Harvesting a Cornucopia of Drugs, Toxins, and Antibiotics
"... Fungi belong amongst the severest pathogens of humans, animals, and plants. For example, Candida spp. and Aspergillus spp. account for most invasive mycoses, and such infections are associated with high rates of mortality in hematology and oncology patients. Worrisomely, it has been estimated that 4 ..."
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that 4 % of all patients who die in hospitals die of invasive aspergillosis and 2 % die of candidiasis [1]. Moreover, in agriculture, filamentous fungi are mainly responsible for severe loss of crops worldwide, destroying over 125 million tons of rice, wheat, maize, potatoes, and soybeans each year
Pearls The Deadly Chytrid Fungus: A Story of an Emerging Pathogen
"... Emerging infectious diseases present a great challenge for the health of both humans and wildlife. The increasing prevalence of drug-resistant fungal pathogens in humans [1] and recent outbreaks of novel fungal pathogens in wildlife populations [2] underscore the need to better understand the origin ..."
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Cited by 3 (0 self)
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unprecedented population losses and local extinctions [3]. While there are multiple causes of amphibian declines, many catastrophic die-offs are attributed to Bd [4,5]. The chytrid pathogen has been documented in hundreds of amphibian species, and reports of Bd’s impact on additional species and in additional
Pearls Death Be Not Proud—Cell Death Control in Plant Fungal Interactions
"... While the concept of programmed cell death (PCD) or its morpho-logical equivalent, apoptosis, was recognized in pockets of research prior to the 1970s, it was not until 1972 that Kerr, Wyllie, and Currie [1] first promulgated the phenomenon. It took nearly 20 years for the original idea to gain acce ..."
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normally detrimental to the organism. Despite the simplicity and finality of the concept of death, the manifold processes by which cells die are not necessarily equiva-lent. While the role of cell death is firmly established in mamma-lian disease, it has not been as deeply characterized in other systems
Pearls, Pith, and Provocation Expanding the Notion of Researcher Distress: The Cumulative Effects of Coding
"... Qualitative researchers who explore the individual’s experience of health, illness, death, and dying often experience emotional stress in their work. In this article, we describe the emotional stress we experienced while coding semistructured, after-death interviews conducted with 38 next of kin of ..."
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Qualitative researchers who explore the individual’s experience of health, illness, death, and dying often experience emotional stress in their work. In this article, we describe the emotional stress we experienced while coding semistructured, after-death interviews conducted with 38 next of kin
Pearls Chrysosporium-Related Fungi and Reptiles: A Fatal Attraction
"... mostly keratinophilic species that live on the remains of hair and feathers in soil. These fungi are rarely reported as animal pathogens, apart from in reptiles, and only a few species have been involved in mycoses. In a comprehensive review of opportunistic mycoses published by Smith [1], only one ..."
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dendrobatidis, which is causing the current catastrophic die-off of amphibians, i.e., chytridiomycosis in frogs [7].
Clinical pearl Development of the human papillomavirus vaccine and guidelines for its use
"... Cervical cancer is an international problem. Worldwide, more than 500,000 women are diagnosed with cervical cancer each year. By the end of 2006, 10,000 new cases will be diagnosed and nearly 4,000 women will die of cervical cancer in the United States alone. Epidemiologic studies published in 1999 ..."
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Cervical cancer is an international problem. Worldwide, more than 500,000 women are diagnosed with cervical cancer each year. By the end of 2006, 10,000 new cases will be diagnosed and nearly 4,000 women will die of cervical cancer in the United States alone. Epidemiologic studies published in 1999
PEARLS A Case for Two-Component Signaling Systems As Antifungal Drug Targets
"... The recent outbreak of fungal meningitis caused by Exserohilum rostratum in patients receiv-ing contaminated steroid injections resulted in 64 deaths, receiving a lot of press and briefly bringing into the public eye the difficulty of treating systemic fungal infections [1]. What is generally less w ..."
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well appreciated, however, is that there are several other, much more common fungal pathogens that pose a serious health threat. Indeed, currently more people die from these fungal diseases worldwide than from tuberculosis or malaria [2]. The fungal pathogens most frequently responsible for human
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