Les illusions du progrès (4e éd. rev. et augmentée, Reprod. en fac-sim.) / Georges Sorel

Collection : Ressources

Kuopio, view from the Puijo Hill

London : Methuen & Co. Ltd 1915

Variabilidade genética de cajuzinho-do-cerrado (Anacardium humile St. Hill.) por meio de marcadores rapd

Nativo do Cerrado brasileiro e com alta variabilidade morfológica, o cajuzinho-do-cerrado (Anacardium humile St. Hill.) apresenta frutos de grande aceitação pelas populações locais, os quais atraem por suas características peculiares, como tamanho, sabor único e potencial para uso sustentável por produtores e pela indústria. A produção de sementes limitada, acarretada pela baixa polinização e pela alta predação por animais e insetos, dificulta a propagação da espécie. O conhecimento da variabilidade genética do cajuzinho-do-cerrado é importante para maximizar o uso de seus recursos genéticos para futuros programas de melhoramento e de conservação da espécie. No presente trabalho, a variabilidade genética de 122 acessos de A. humile procedentes de 11 municípios (procedências) do Cerrado de Goiás e Mato Grosso, foi estimada por meio de marcadores RAPD. As similaridades genéticas foram estimadas a partir da matriz binária, tendo sido processadas análises de agrupamento e de dispersão gráfica a partir da matriz de distâncias. Os iniciadores com maior expressão foram OPA11 e 08. Os dez iniciadores utilizados geraram 157 bandas, sendo 156 polimórficas (99 %), com média de 15,6 bandas/ iniciadores. Grande variabilidade dentro de municípios foi detectada, sendo o polimorfismo superior a 90 %, exceto da procedência de Jataí-GO. A distância entre acessos variou de 0,138 a 0,561, com média de 0,370, sendo os menores valores registrados entre os acessos de Mineiros-GO, e Serranópolis-GO. Os acessos de Caiapônia-GO, e Santo Antônio do Descoberto-GO, foram os mais distantes geneticamente. A dissimilaridade total entre acessos variou de 0,103 a 0,796, com médias de 0,390. Os acessos 87 e 114 de Serranópolis-GO, e Santo Antônio do Descoberto-GO, respectivamente, foram os mais distantes geneticamente, demonstrando a importância dessas procedências no enriquecendo do banco de germoplasma da espécie.

"Sanat ovat käsiä, joilla voi koskettaa toista" : John Shotterin haastattelu

Haastattelijan suomennos: Onnismaa, J. 2005. "You can touch other people with your words". Interview with John Shotter. Lifelong learning in Europe LLinE 10 (4): 242-247

Analyysi John "Mitch" Mitchellin rumpukomppaamisesta "Purple Haze"-sävelmän studio- ja Woodstock-versioissa.

Tässä työssä tutkittiin ja analysoitiin englantilaisen rock-rumpali John ”Mitch” Mitchellin musiikillista sanavarastoa ja rytmiikan käsittelyä Jimi Hendrixin ”Purple Haze” -sävelmän kahdessa eri versiossa.Tavoitteena oli selvittää, minkälaisista elementeistä Mitchellin komppaus muodostuu, ja mikä on hänelle tyypillinen fillaustyyli. Työmenetelminä käytettiin analyysia transkriptioaineistosta, observointia, eli tarkastelua DVD-aineistosta ja emulointia, eli soittamista tehdyistä transkriptioista. Tutkimuksen alkuun liitettiin selitykset tutkimuksessa esiintyvistä musiikillisista termeistä sekä Mitchellin biografia. Seuraavaksi analysoitiin ”Purple Haze” -sävelmän studioversio. Analyysissa sävelmä pilkottiin useampiin muutaman tahdin mittaisiin osioihin, joita kaikkia tarkasteltiin erikseen edeten järjestelmällisesti alusta loppuun. Tämän jälkeen sävelmän live-versio analysoitiin edellä mainittua menetelmää käyttäen. Lopuksi pohdittiin tiivistetysti tutkimuksen eri vaiheita ja Mitch Mitchellin soittotyyliä ”Purple Haze” -sävelmän versioissa. Tutkimuksessa todettiin Mitchellin soittotyylin olevan runsasta ja sisältävän paljon fillejä. Fillit koostuivat kuudestoistaosista, sekä kuudestoistaosatrioleista ja -sekstoleista. Woodstock -versiossa fillit koostuivat samoista aineksista ja sisälsivät kolmen kahdeksasosan tai kolmen kuudestoistaosan mittaisia sekvenssejä. Todettiin myös, että Mitchell kuunteli ja seurasi erinomaisesti Hendrixin soittoa ja reagoi hänen rytmiikan käsittelyynsä. Mitchell ja Hendrix toimivat molemmat rytmisten ärsykkeiden antajina soittaessaan.

John Ruskin. Paysages de pierres

L'article analyse une aquarelle de John Ruskin intitulée "Bay of Uri, Lake Lucern" (1858) et évoque d'autres oeuvres de Ruskin présentées dans l'exposition de la Fondation Pierre Arlaud à Lens (Valais, Suisse) durant l'hiver 2015-2016. Il montre l'importance de la méditation sur les pierres dans la pensée de Ruskin.

Modifier Genes as Therapeutics: The Nuclear Hormone Receptor Rev Erb Alpha (Nr1d1) Rescues Nr2e3 Associated Retinal Disease

Nuclear hormone receptors play a major role in many important biological processes. Most nuclear hormone receptors are ubiquitously expressed and regulate processes such as metabolism, circadian function, and development. They function in these processes to maintain homeostasis through modulation of transcriptional gene networks. In this study we evaluate the effectiveness of a nuclear hormone receptor gene to modulate retinal degeneration and restore the integrity of the retina. Currently, there are no effective treatment options for retinal degenerative diseases leading to progressive and irreversible blindness. In this study we demonstrate that the nuclear hormone receptor gene Nr1d1 (Rev-Erba) rescues Nr2e3- associated retinal degeneration in the rd7 mouse, which lacks a functional Nr2e3 gene. Mutations in human NR2E3 are associated with several retinal degenerations including enhanced S cone syndrome and retinitis pigmentosa. The rd7 mouse, lacking Nr2e3, exhibits an increase in S cones and slow, progressive retinal degeneration. A traditional genetic mapping approach previously identified candidate modifier loci. Here, we demonstrate that in vivo delivery of the candidate modifier gene, Nr1d1 rescues Nr2e3 associated retinal degeneration. We observed clinical, histological, functional, and molecular restoration of the rd7 retina. Furthermore, we demonstrate that the mechanism of rescue at the molecular and functional level is through the re-regulation of key genes within the Nr2e3-directed transcriptional network. Together, these findings reveal the potency of nuclear receptors as modulators of disease and specifically of NR1D1 as a novel therapeutic for retinal degenerations.

Altered Sleep Homeostasis in Rev-erbα Knockout Mice.

STUDY OBJECTIVES: The nuclear receptor REV-ERBα is a potent, constitutive transcriptional repressor critical for the regulation of key circadian and metabolic genes. Recently, REV-ERBα's involvement in learning, neurogenesis, mood, and dopamine turnover was demonstrated suggesting a specific role in central nervous system functioning. We have previously shown that the brain expression of several core clock genes, including Rev-erbα, is modulated by sleep loss. We here test the consequences of a loss of REV-ERBα on the homeostatic regulation of sleep. METHODS: EEG/EMG signals were recorded in Rev-erbα knockout (KO) mice and their wild type (WT) littermates during baseline, sleep deprivation, and recovery. Cortical gene expression measurements after sleep deprivation were contrasted to baseline. RESULTS: Although baseline sleep/wake duration was remarkably similar, KO mice showed an advance of the sleep/wake distribution relative to the light-dark cycle. After sleep onset in baseline and after sleep deprivation, both EEG delta power (1-4 Hz) and sleep consolidation were reduced in KO mice indicating a slower increase of homeostatic sleep need during wakefulness. This slower increase might relate to the smaller increase in theta and gamma power observed in the waking EEG prior to sleep onset under both conditions. Indeed, the increased theta activity during wakefulness predicted delta power in subsequent NREM sleep. Lack of Rev-erbα increased Bmal1, Npas2, Clock, and Fabp7 expression, confirming the direct regulation of these genes by REV-ERBα also in the brain. CONCLUSIONS: Our results add further proof to the notion that clock genes are involved in sleep homeostasis. Because accumulating evidence directly links REV-ERBα to dopamine signaling the altered homeostatic regulation of sleep reported here are discussed in that context.