Articles de revues : « Richepin »

1

Gary, Rémo. « Jean Richepin, mon camarade ! » Revue d'histoire du XIXe siècle, n^o 47 (31 décembre 2013) : 47–50. http://dx.doi.org/10.4000/rh19.4545.

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Richepin, Jean. « Citation de Jean Richepin, Oiseaux de passage ». Chimères N° 27, n^o 1 (1 janvier 1996) : 3. http://dx.doi.org/10.3917/chime.027.0003.

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Leite de Menezes, André Luís, et Charles Vitor Berndt. « Tradução do conto "Constant Guignard", de Jean Richepin ». caleidoscópio : literatura e tradução 3, n^o 2 (6 décembre 2019) : 111–23. http://dx.doi.org/10.26512/caleidoscopio.v3i2.26628.

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Granier, Caroline. « Césarine de Jean Richepin ou la neutralité impossible ». Revue d'histoire du XIXe siècle, n^o 24 (1 juin 2002) : 53–70. http://dx.doi.org/10.4000/rh19.369.

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Fournier, Jean-François. « La mort au crible de l'humour dans Les morts bizarres de Jean Richepin ». French Forum 36, n^o 2-3 (2011) : 79–96. http://dx.doi.org/10.1353/frf.2011.0013.

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Raffi, Maria Emanuela. « Jean-François Fournier, La mort au crible de l’humour dans “Les morts bizarres” de Jean Richepin ». Studi Francesi, n^o 169 (LVII | I) (1 avril 2013) : 203. http://dx.doi.org/10.4000/studifrancesi.3506.

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Tuo, Sing-How, Margaret R. Mulholland, Yuh-Ling Lee Chen, P. Dreux Chappell et Houng-Yung Chen. « Patterns in Rhizosolenia- and Guinardia-associated Richelia abundances in the tropical marginal seas of the western North Pacific ». Journal of Plankton Research 43, n^o 3 (22 avril 2021) : 338–52. http://dx.doi.org/10.1093/plankt/fbab022.

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Abstract Richelia is a widespread, heterocystous, N2-fixing cyanobacterium that occurs in oligotrophic seas. It can be symbiotic within rhizosolenoid hosts, including Rhizosolenia (R-R) and Guinardia (G-R), and occasionally occurs as free-living (FL-R) filaments. We investigated the Richelia abundances in the South China (SCS) and Philippine Seas (PS) during the northeast (NEM) and southwest monsoon (SWM) seasons between 2001 and 2016. Field results showed that G-R was most abundant in the SCS during the SWM. Both R-R and FL-R were more abundant in the PS than the SCS and during the SWM versus the NEM. In general, R-R were more abundant than G-R, except at the SCS-SWM stations where abundances were comparable. Multivariate statistical models indicate that as R-R and G-R were abundant in warmer seawaters, nitrate plus nitrite was a key factor negatively controlling R-R abundance while silicate was more positively related to G-R. Positive correlation between G-R and FL-R abundances and microscopic observations imply that like Rhizosolenia-associated Richelia, filaments released from Guinardia hosts can remain viable outside their diatom hosts for time periods on the order of days. Overall, results reveal different distribution patterns between the two rhizosolenoid-Richelia symbioses and both G-R and R-R likely contribute to FL-R in the field.

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CHIANG, M. S., et R. CRETE. « RICHELAIN : A CLUBROOT-RESISTANT CABBAGE CULTIVAR ». Canadian Journal of Plant Science 69, n^o 1 (1 janvier 1989) : 337–40. http://dx.doi.org/10.4141/cjps89-043.

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The Richelain cabbage is a newly released cultivar for the fresh market. It is resistant to races 2, 6 and 7 (Williams 1966) or ECD 16/02/31 and 16/02/30 (Buczacki et al. 1975) of the clubroot pathogen, Plasmodiophora brassicae Wor. Slightly ovate heads with dark blue green crinkly leaves and near white internal color are some other features of this cultivar. The Richelain cabbage cultivar was developed at the Agriculture Canada Research Station, Saint-Jean-sur-Richelieu, Quebec.Key words: Brassica oleracea ssp. capitata, clubroot resistance, crucifers, cabbage cultivar, cultivar description

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Simoson, Andrew J. « Tales of Impossibility by David Richeson ». Mathematical Intelligencer 42, n^o 4 (14 août 2020) : 89–91. http://dx.doi.org/10.1007/s00283-020-10003-3.

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Jabir, T., V. Dhanya, Y. Jesmi, M. P. Prabhakaran, N. Saravanane, G. V. M. Gupta et A. A. M. Hatha. « Occurrence and Distribution of a Diatom-Diazotrophic Cyanobacteria Association during a Trichodesmium Bloom in the Southeastern Arabian Sea ». International Journal of Oceanography 2013 (6 août 2013) : 1–6. http://dx.doi.org/10.1155/2013/350594.

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Symbiotic diatom-diazotrophic cyanobacteria association (DDA) of Rhizosolenia hebetata and Rhizosolenia formosa with endosymbiotic cyanobacteria Richelia intracellularis was noticed and documented for the first time during a bloom of the cyanobacterium Trichodesmium erythraeum in the oligotrophic shelf waters along Kochi and Mangalore transects, southeastern Arabian Sea (SEAS), during spring intermonsoon (April 2012). Although the host is frequently seen, the symbiont is rarely reported in the Indian EEZ. The presence of nitrogen-fixing symbiotic association of Rhizosolenia-Richelia along with Trichodesmium erythraeum highlights the significance of DDAs on the nutrient and energy budgets of phytoplankton in the oligotrophic environments of the Arabian Sea during spring intermonsoon.

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Danova, Kalina, Vaclav Motyka, Antoaneta Trendafilova, Petre I. Dobrev, Viktorya Ivanova et Ina Aneva. « Evolutionary Aspects of Hypericin Productivity and Endogenous Phytohormone Pools Evidenced in Hypericum Species In Vitro Culture Model ». Plants 11, n^o 20 (18 octobre 2022) : 2753. http://dx.doi.org/10.3390/plants11202753.

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Shoot cultures of hypericin non-producing H. calycinum L. (primitive Ascyreia section), hypericin-producing H. perforatum L., H. tetrapterum Fries (section Hypericum) and H. richeri Vill. (the evolutionarily most advanced section Drosocarpium in our study) were developed and investigated for their growth, development, hypericin content and endogenous phytohormone levels. Hypericins in wild-growing H. richeri significantly exceeded those in H. perforatum and H. tetrapterum. H. richeri also had the highest hypericin productivity in vitro in medium supplemented with 0.2 mg/L N6-benzyladenine and 0.1 mg/L indole-3-butyric acid and H. tetrapterum—the lowest one in all media modifications. In shoot culture conditions, the evolutionarily oldest H. calycinum had the highest content of salicylic acid and total jasmonates in some of its treatments, as well as dominance of the storage form of abscisic acid (ABA-glucose ester) and lowest cytokinin ribosides and cytokinin O-glucosides as compared with the other three species. In addition, the evolutionarily youngest H. richeri was characterized by the highest total amount of cytokinin ribosides. Thus, both evolutionary development and the hypericin production capacity seemed to interact closely with the physiological parameters of the plant organism, such as endogenous phytohormones, leading to the possible hypothesis that hypericin productivity may have arisen in the evolution of Hypericum as a means to adapt to environmental changes.

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Flores, Saúl. « Growth and seasonality of seedlings and juveniles of primary species of a cloud forest in northern Venezuela ». Journal of Tropical Ecology 8, n^o 3 (août 1992) : 299–305. http://dx.doi.org/10.1017/s0266467400006556.

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ABSTRACTThe survival, height and leaf production of seedlings and juveniles of Aspidosperma fendleri and Richena grandis were measured monthly for three years after germination. During the first year, some seedlings and juveniles of Aspidosperma fendleri were collected and the number of rootlets, the primary root length and the shoot: root ratio were determined.Both species show periodicity in growth but their relative growth rate differs between species. For Aspidosperma fendleri, the highest relative growth rate (0.313 y-1) was found for individuals grown under greenhouse conditions followed by individuals growing in an old forest gap (0.143 y-1) and finally individuals under the forest canopy (0.137 y-1). For Richeria grandis, the relative growth rate under the forest canopy was 0.261 y-1. Leaf production for Aspidosperma fendleri in the forest (natural conditions) was 4.39 total mean leaf number for five years and 5.46 total mean leaf number under greenhouse conditions. For Richeria grandis it was 5.34 mean leaf production for four years. The root: shoot ratio for Aspidosperma fendleri was constant during the observation year. Aspidosperma fendleri showed a lower number of rootlets than did Richeria grandis. There was an inverse relationship between growth and survival during the dry season. During this period, mortality was higher and the highest mortality occurred during the first year when the total relative growth rate was highest.Slow growth is evident in both species. This mechanism may represent an adaptive advantage to remain dormant until there is an opening in the forest canopy. Since the seeds of Aspidosperma fendleri and Richeria grandis are highly vulnerable to predators and pathogens, slow growth as seedlings and juveniles allows them to survive, and contributes to regeneration in cloud forest.

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Shen, Yinwu, Yunzhi Zhu et Yongding Liu. « EFFECTS OF DIFFERENT LIGHT QUALITY ON RICHELIA SINICA ». Acta Hydrobiologica Sinica 23, n^o 3 (1 mai 1999) : 285–87. http://dx.doi.org/10.3724/issn1000-3207-1999-3-285-z.

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McCrae, Robert R., Antonio Terracciano, Anu Realo et Jüri Allik. « On the validity of culture‐level personality and stereotype scores ». European Journal of Personality 21, n^o 8 (décembre 2007) : 987–91. http://dx.doi.org/10.1002/per.659.

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In response to comments by Perugini and Richetin and by Ashton, we discuss the reference‐group effect as a potential source of distortion in cross‐cultural comparisons and suggest some research designs to test its nature and importance. We argue that laboratory studies of personality are of limited utility in understanding personality questionnaire responses in real life. We summarise evidence in favour of the validity of aggregate personality traits and suggest that more scepticism is needed with regard to the accuracy of national character stereotypes. Published in 2007 by John Wiley & Sons, Ltd.

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Moura, C. C., T. R. Costa, L. C. Moura, L. R. Carvalho, M. Titon, I. M. Pereira et E. L. M. Machado. « Vegetative propagation of Richeria grandis Vahl. by mini-cutting ». Revista Brasileira de Ciências Agrárias - Brazilian Journal of Agricultural Sciences 15, n^o 4 (28 octobre 2020) : 1–8. http://dx.doi.org/10.5039/agraria.v15i4a7930.

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Richeson, David. « 2. Communicating Mathematics Using Social Media by David Richeson ». Notices of the American Mathematical Society 67, n^o 02 (1 février 2020) : 1. http://dx.doi.org/10.1090/noti2023.

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Ferretti, G., F. Maggi et B. Tirillini. « Essential oil composition ofHypericum richeri Vill. from Italy ». Flavour and Fragrance Journal 20, n^o 3 (2005) : 295–98. http://dx.doi.org/10.1002/ffj.1412.

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Zdunić, Gordana, Dejan Gođevac, Marina Milenković, Katarina Šavikin, Nebojša Menković et Silvana Petrović. « Anti-inflammatory and Gastroprotective Properties of Hypericum Richeri Oil Extracts ». Natural Product Communications 5, n^o 8 (août 2010) : 1934578X1000500. http://dx.doi.org/10.1177/1934578x1000500814.

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Oil extracts of flowering tops of Hypericum richeri Vill. prepared in three different ways were evaluated for chemical composition, and Anti-inflammatory and Gastroprotective activities. An HPLC method was developed for determination of two dominant flavonoids, quercetin and I3,II8-biapigenin. The carrageenan-induced rat paw edema test was used for screening the antiinflammatory activity, while indomethacin-induced rat gastric mucosa damage test was used for evaluation of gastroprotective activity. The oil extract prepared by maceration with 96% ethanol, followed by extraction with sunflower oil by heating on a water bath, exhibited the highest antiinflammatory (38.4 %) and gastroprotective activities (gastric damage score of 0.9). The same oil extract had the highest content of quercetin (49 μg/mL) and I3,II8-biapigenin (60 μg/mL). These results approve the usage of oil extracts of H. richeri as an antiinflammatory and gastroprotective agent.

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Carneiro de Melo Moura, Carina, Fabian Brambach, Kevin Jair Hernandez Bado, Konstantin V. Krutovsky, Holger Kreft, Sri Sudarmiyati Tjitrosoedirdjo, Iskandar Z. Siregar et Oliver Gailing. « Integrating DNA Barcoding and Traditional Taxonomy for the Identification of Dipterocarps in Remnant Lowland Forests of Sumatra ». Plants 8, n^o 11 (30 octobre 2019) : 461. http://dx.doi.org/10.3390/plants8110461.

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DNA barcoding has been used as a universal tool for phylogenetic inferences and diversity assessments, especially in poorly studied species and regions. The aim of this study was to contrast morphological taxonomy and DNA barcoding, using the three frequently used markers matK, rbcL, and trnL-F, to assess the efficiency of DNA barcoding in the identification of dipterocarps in Sumatra, Indonesia. The chloroplast gene matK was the most polymorphic among these three markers with an average interspecific genetic distance of 0.020. The results of the molecular data were mostly in agreement with the morphological identification for the clades of Anthoshorea, Hopea, Richetia, Parashorea, and Anisoptera, nonetheless these markers were inefficient to resolve the relationships within the Rubroshorea group. The maximum likelihood and Bayesian inference phylogenies identified Shorea as a paraphyletic genus, Anthoshorea appeared as sister to Hopea, and Richetia was sister to Parashorea. A better discriminatory power among dipterocarp species provided by matK and observed in our study suggests that this marker has a higher evolutionary rate than the other two markers tested. However, a combination of several different barcoding markers is essential for reliable identification of the species at a lower taxonomic level.

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Villareal, Tracy A. « Division cycles in the nitrogen-fixingRhizosolenia(Bacillariophyceae)-Richelia(Nostocaceae) symbiosis ». British Phycological Journal 24, n^o 4 (décembre 1989) : 357–65. http://dx.doi.org/10.1080/00071618900650371.

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De Riccardis, F., B. Giovannitti, M. Iorizzi, L. Minale, R. Riccio, C. Debitus et B. Richer de Forges. « Sterol composition of the “living fossil” crinoid Gymnocrinus richeri ». Comparative Biochemistry and Physiology Part B : Comparative Biochemistry 100, n^o 3 (janvier 1991) : 647–51. http://dx.doi.org/10.1016/0305-0491(91)90234-5.

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Swartz, Paul. « Of Time and Personal Myth ». Perceptual and Motor Skills 61, n^o 3_suppl (décembre 1985) : 1207–14. http://dx.doi.org/10.2466/pms.1985.61.3f.1207.

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Self-realization, like music, images time. But whereas music images lived time, self-realization images the virtual time particular to personal myth. In the well-lived life the sense of eternal return native to personal myth becomes an awareness of continual, richening return to what we now are and always have been. The recurrence transtemporalizes us, raising the life course into a living work of art.

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BITNER, MARIA ALEKSANDRA. « Recent Brachiopoda from the Norfolk Ridge, New Caledonia, with description of four new species ». Zootaxa 2235, n^o 1 (18 septembre 2009) : 1–39. http://dx.doi.org/10.11646/zootaxa.2235.1.1.

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Twenty-two brachiopod species belonging to 19 genera have been recognized in the material collected during two cruises, Norfolk 1 and Norfolk 2, to the Norfolk Ridge south of New Caledonia, at depths of 180 to 1150 m. Thirteen species are reported for the first time from this locality, while four genera, Aulites, Septicollarina, Annuloplatidia and Campages, are noted for the first time from the New Caledonian region. Thecidellina minuta is recorded for the first time from the Pacific. Four new species are described ― Cryptopora norfolkensis sp. nov., Aulites crosnieri sp. nov., Septicollarina zezinae sp. nov. and Annuloplatidia richeri sp. nov. The distribution of the particular species and their abundance vary considerably between the 15 sampled seamounts, with Stenosarina crosnieri and Fallax neocaledonensis being most widely distributed, and the seamount Crypthelia having the highest biodiversity. The seamount brachiopods show considerable affinity to the brachiopods of adjacent regions, and only three species ― C. norfolkensis, A. crosnieri and A. richeri ― can be regarded as potential endemics. The brachiopod fauna is more similar to that in the area around Fiji than to that around Australasia.

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Shen, Yinwu, Qianlin Wang et Shanghao Li. « MASS CULTURE AND THE ANALYSIS OF NUTRIENT COMPOSITION OF RICHELIA SINICA ». Acta Hydrobiologica Sinica 15, n^o 3 (1 juillet 1991) : 279–81. http://dx.doi.org/10.3724/issn1000-3207-1991-3-279-t.

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Urabe, Yuki, Rafal Rzepka et Kenji Araki. « Emoticon Recommendation System to Richen Your Online Communication ». International Journal of Multimedia Data Engineering and Management 5, n^o 1 (janvier 2014) : 14–33. http://dx.doi.org/10.4018/ijmdem.2014010102.

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Japanese emoticons are widely used to express users' feelings and intentions in social media, blogs and instant messages. Japanese smartphone keypads have a feature that shows a list of emoticons, enabling users to insert emoticons simply by touching them. However, this list of emoticons contains more than 200, which is difficult to choose from, so a method to reorder the list and recommend appropriate emoticons to users is necessary. This paper proposes an emoticon recommendation method based on the emotive statements of users and their past selections of emoticons. The system is comprised of an affect analysis system and an original emoticon database: a table of 59 emoticons numerically categorized by 10 emotion types. The authors' experiments showed that 73.0% of chosen emoticons were among the top five recommended by the system, which is an improvement of 43.5% over the method used in current smartphones, which is based only on users' past emoticon selections.

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Villareal, Tracy A. « Laboratory Culture and Preliminary Characterization of the Nitrogen-Fixing Rhizosolenia-Richelia Symbiosis ». Marine Ecology 11, n^o 2 (juin 1990) : 117–32. http://dx.doi.org/10.1111/j.1439-0485.1990.tb00233.x.

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Kerlin, Michael J. « The Challenge of Liberation Theology : A First World Response ed. by Brian Mahan and L. Dale Richesin ». Thomist : A Speculative Quarterly Review 49, n^o 2 (1985) : 317–19. http://dx.doi.org/10.1353/tho.1985.0038.

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Liu, Zheng, et Xiao Mei Liu. « Effect of La on Solute Segregation during Solidification of Al₂O₃•SiO_2f/A356 Alloy Composite ». Advanced Materials Research 284-286 (juillet 2011) : 98–101. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.98.

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Al2O3·SiO2f/A356 composites contained La were fabricated by squeeze casting, and effect of La on the solute segregation and microstructure were researched. The results indicate that the microstructure in the composite can be refined by La, which enriches near the interface to be favorable to improve the wettability between the fiber and Al alloy. The phases RE-richening do not formed at the interface. There is no special influence of La on the Mg segregation in the matrix alloy. The distribution of Mg and La in the composite are near the interface.

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Jerković, Igor, Maja Marasović, Zvonimir Marijanović, Kroata Hazler Pilepić, Željan Maleš et Mladen Miloš. « Chemical Composition of Hypericum richeri subsp. grisebachii Essential Oil from Croatia ». Natural Product Communications 8, n^o 2 (février 2013) : 1934578X1300800. http://dx.doi.org/10.1177/1934578x1300800226.

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The aerial parts of Hypericum richeri Vill. subsp. grisebachii (Boiss.) Nyman were collected from two different locations in Croatia and subjected to hydrodistillation. GC/FID and GC/MS analysis of the isolated essential oils revealed 64 compounds representing 94.7% and 98.2% of the total oils. Predominant constituents in both samples were: germacrene D (10.9%; 6.0%), bicyclogermacrene (4.7%; 3.5%), α-pinene (6.8%; 6.9%), β-pinene (8.1%; 5.1%), decanoic acid (4.5%; 6.8%), β-caryophyllene (3.3%; 7.5%), δ-cadinene (7.0%; 4.4%), spathulenol (6.0%; 9.5%) and tetracosane (3.1%; 5.8%). Comparison of both samples revealed similarity in the chemical composition with minor fluctuations of constituent percentages. The chemical profile of Croatian oils was in general similar to those reported for other geographic areas regarding major mono- and sesquiterpene constituents. However, spathulenol, 5-cadinene and bicyclogermacrene were more abundant in Croatian oils. The presence of decanoic acid (4.5%; 6.8%) in Croatian oils was the major difference between acids and fatty acids derivatives. Higher abundance of alkanes (particularly tetracosane and docosane) was also noticed.

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Fornasiero, R. Baroni, L. Maff, S. Benvenuti et A. Bianchi. « Morphological and phytochemical features of secretory structures in Hypericum richeri (Clusiaceae) ». Nordic Journal of Botany 20, n^o 4 (août 2000) : 427–34. http://dx.doi.org/10.1111/j.1756-1051.2000.tb01583.x.

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FREIRE, PABLO R., et CRISTIANA S. SEREJO. « The genus Trischizostoma (Crustacea : Amphipoda : Trischizostomidae) from the Southwest Atlantic, collected by the REVIZEE Program ». Zootaxa 645, n^o 1 (16 septembre 2004) : 1. http://dx.doi.org/10.11646/zootaxa.645.1.1.

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Based on material collected by the REVIZEE Program along the Brazilian coastline between latitudes 11 to 22 S, five species of Trischizostoma were recorded, four are known species and are herein redescribed: T. denticulatum Ledoyer, 1978, T. longirostrum Chevreux, 1919, T. raschi Boeck, 1861, T. richeri Lowry & Stoddart, 1994, and one species is new, Trischizostoma costai sp. nov. Despite the wide world distribution of the genus, this is the first record of Trischizostoma from the southwestern Atlantic.

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DeVito, Jr., Richard A. « Thanks and Welcome ! » American Journal of Recreation Therapy 18, n^o 3 (1 juillet 2019) : 6. http://dx.doi.org/10.5055/ajrt.2019.0196.

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It is with saddened heart that I announce the retirement of Dr. Nancy Richeson, PhD, CTRS, FDRT as Editorin- Chief of the American Journal of Recreation Therapy (AJRT). . .As with many transitions, change can be unsettling. Fortunately for the American Journal of Recreation Therapy and the field, I am pleased to welcome Dr. Allison Wilder, PhD, CTRS/L as our new Editor-in-Chief. Dr. Wilder is Associate Professor and Faculty Fellow at the Center on Aging and Community Living in the Department of Recreation Management and Policy at the University of New Hampshire—College of Health and Human Services.

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Janson, Wouters, Bergman et Carpenter. « Host specificity in the Richelia-diatom symbiosis revealed by hetR gene sequence analysis ». Environmental Microbiology 1, n^o 5 (septembre 1999) : 431–38. http://dx.doi.org/10.1046/j.1462-2920.1999.00053.x.

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Navarro, Fernanda Keley Silva Pereira, Renan de Souza Rezende et José Francisco Gonçalves Júnior. « Experimental assessment of temperature increase and presence of predator carcass changing the response of invertebrate shredders ». Biota Neotropica 13, n^o 4 (décembre 2013) : 28–33. http://dx.doi.org/10.1590/s1676-06032013000400002.

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The role of the invertebrate shredders in leaf decomposition process in tropical lotic ecosystems has been explored only recently. In addition to the influence of the quality of litter and the temperature, the risk of predation generally results in changes on the survival and behavior of invertebrate shredders. The aim of this study was to observe the responses of the invertebrate shredders to different species of leaf litters (Experiment 1: Talauma ovata and Inga laurina ; Experiment 2: Talauma ovata, Inga laurina and Richeria grandis ) under gradual temperature rise (24 °C, 26 °C, 28 °C, 30 °C, 32 °C), in the presence (Experiment 2) and absence (Experiment1) of fish (Astyanax sp.) carcasses, as well as to observe the possible consequences of the leaf mass loss (LML). The results from the first experiment suggest that the quality of the litter was capable of changing the feeding preference of the invertebrate shredders, regardless of temperature. In the second experiment, the leaf mass loss was faster in litter with higher quality (Talauma ovate and Richeria grandis ); in addition, we observed that the exploration of these resources resulted in the case-building in the presence of fish carcass. The negative correlation of leaf mass loss of Inga laurina in relation to temperature in the presence of fish carcass probably occurred due to an accelerated metabolic, respiratory and cardiac rates. Apparently, this process may have led to an increased shredding activity on the litters of better quality in relation to the Inga laurina. This fact may be related to less energy consumption, so as to meet their energy demands more efficiently.

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Inomura, Keisuke, Christopher L. Follett, Takako Masuda, Meri Eichner, Ondřej Prášil et Curtis Deutsch. « Carbon Transfer from the Host Diatom Enables Fast Growth and High Rate of N2 Fixation by Symbiotic Heterocystous Cyanobacteria ». Plants 9, n^o 2 (4 février 2020) : 192. http://dx.doi.org/10.3390/plants9020192.

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Diatom–diazotroph associations (DDAs) are symbioses where trichome-forming cyanobacteria support the host diatom with fixed nitrogen through dinitrogen (N2) fixation. It is inferred that the growth of the trichomes is also supported by the host, but the support mechanism has not been fully quantified. Here, we develop a coarse-grained, cellular model of the symbiosis between Hemiaulus and Richelia (one of the major DDAs), which shows that carbon (C) transfer from the diatom enables a faster growth and N2 fixation rate by the trichomes. The model predicts that the rate of N2 fixation is 5.5 times that of the hypothetical case without nitrogen (N) transfer to the host diatom. The model estimates that 25% of fixed C from the host diatom is transferred to the symbiotic trichomes to support the high rate of N2 fixation. In turn, 82% of N fixed by the trichomes ends up in the host. Modeled C fixation from the vegetative cells in the trichomes supports only one-third of their total C needs. Even if we ignore the C cost for N2 fixation and for N transfer to the host, the total C cost of the trichomes is higher than the C supply by their own photosynthesis. Having more trichomes in a single host diatom decreases the demand for N2 fixation per trichome and thus decreases their cost of C. However, even with five trichomes, which is about the highest observed for Hemiaulus and Richelia symbiosis, the model still predicts a significant C transfer from the diatom host. These results help quantitatively explain the observed high rates of growth and N2 fixation in symbiotic trichomes relative to other aquatic diazotrophs.

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Maffi, L., L. Camoni, R. Baroni Fornasiero et A. Bianchi. « Morphology and development of secretory structures in Hypericum perforatum and H. richeri ». Nordic Journal of Botany 23, n^o 4 (août 2003) : 453–61. http://dx.doi.org/10.1111/j.1756-1051.2003.tb00419.x.

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Pérez Alcázar, Germán A., Ligia Edith Zamora, José Francisco Marco, Juan José Romero, Jesús María González et Francisco Javier Palomares. « Magnetic and Structural Characterization of Mechanically Alloyed Fe50co50 Samples ». Revista de Ciencias 15 (13 février 2012) : 41–47. http://dx.doi.org/10.25100/rc.v15i0.516.

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Samples of nominal composition Fe50Co50 were produced by mechanical alloying byusing a planetary ball mill and different milling times. The samples were studied via X-raydiffraction, Mössbauer spectroscopy, and X-ray photoelectron spectroscopy to characterize thephase distribution resulting from the milling process. The Mössbauer data indicated that Co startsdiffusing into Fe after 8 h of milling. Between t = 8h and t = 24 h the sample has a heterogeneouscomposition, presenting a bimodal hyperfine field distribution with maxima centred at 34.3 T and35.8 - 36.4 T, compatible with the presence of different Fe environments (richer in Co and richerin Fe, respectively). After 48 h of milling, the sample presents a more homogeneous compositionshowing an almost symmetric hyperfine magnetic field distribution centred at H=34.9 T,indicating that a disordered equiatomic FeCo solid solution has already been formed. The X-rayphotoelectron spectroscopy data indicate that the native oxide layer formed on the freshly milledsamples contains Co2+, Fe2+ and Fe3+ oxides. After complete removal of this native oxide layer byAr ion bombardment, X-ray photoelectron spectroscopy analysis yields the composition of thenominal equiatomic Fe50Co50 alloy.

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Moura, C. C., T. R. Costa, P. A. Oliveira, L. C. Moura, L. R. Carvalho, M. Titon, I. M. Pereira et E. L. M. Machado. « Different substrates and protected environments for the initial development of Richeria grandis Vahl seedlings ». Revista Brasileira de Ciências Agrárias - Brazilian Journal of Agricultural Sciences 15, n^o 3 (25 juillet 2020) : 1–8. http://dx.doi.org/10.5039/agraria.v15i3a7890.

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Daems, Jeanine. « Euler’s Gem—The Polyhedron Formula and the Birth of Topology by David S. Richeson ». Mathematical Intelligencer 32, n^o 3 (22 décembre 2009) : 56–57. http://dx.doi.org/10.1007/s00283-009-9116-0.

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De Riccardis, Francesco, Maria Iorizzi, Luigi Minale, Raffaele Riccio, Bertrand Richer de Forges et Cecile Debitus. « The gymnochromes : novel marine brominated phenanthroperylenequinone pigments from the stalked crinoid Gymnocrinus richeri ». Journal of Organic Chemistry 56, n^o 24 (novembre 1991) : 6781–87. http://dx.doi.org/10.1021/jo00024a016.

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Richeson, Jennifer, et Joseph Dycus. « "You See Race, But Do You Want to Talk About It?" With Jennifer Richeson, PhD ». Eye on Psi Chi Magazine 23, n^o 3 (2019) : 26–27. http://dx.doi.org/10.24839/2164-9812.eye23.3.26.

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Pyle, Amy E., Allison M. Johnson et Tracy A. Villareal. « Isolation, growth, and nitrogen fixation rates of the Hemiaulus-Richelia (diatom-cyanobacterium) symbiosis in culture ». PeerJ 8 (8 octobre 2020) : e10115. http://dx.doi.org/10.7717/peerj.10115.

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Nitrogen fixers (diazotrophs) are often an important nitrogen source to phytoplankton nutrient budgets in N-limited marine environments. Diazotrophic symbioses between cyanobacteria and diatoms can dominate nitrogen-fixation regionally, particularly in major river plumes and in open ocean mesoscale blooms. This study reports the successful isolation and growth in monocultures of multiple strains of a diatom-cyanobacteria symbiosis from the Gulf of Mexico using a modified artificial seawater medium. We document the influence of light and nutrients on nitrogen fixation and growth rates of the host diatom Hemiaulus hauckii Grunow together with its diazotrophic endosymbiont Richelia intracellularis Schmidt, as well as less complete results on the Hemiaulus membranaceus-R. intracellularis symbiosis. The symbioses rates reported here are for the joint diatom-cyanobacteria unit. Symbiont diazotrophy was sufficient to support both the host diatom and cyanobacteria symbionts, and the entire symbiosis replicated and grew without added nitrogen. Maximum growth rates of multiple strains of H. hauckii symbioses in N-free medium with N2 as the sole N source were 0.74–0.93 div d−1. Growth rates followed light saturation kinetics in H. hauckii symbioses with a growth compensation light intensity (EC) of 7–16 µmol m−2s−1and saturation light level (EK) of 84–110 µmol m−2s−1. Nitrogen fixation rates by the symbiont while within the host followed a diel pattern where rates increased from near-zero in the scotophase to a maximum 4–6 h into the photophase. At the onset of the scotophase, nitrogen-fixation rates declined over several hours to near-zero values. Nitrogen fixation also exhibited light saturation kinetics. Maximum N2 fixation rates (84 fmol N2 heterocyst−1h−1) in low light adapted cultures (50 µmol m−2s−1) were approximately 40–50% of rates (144–154 fmol N2 heterocyst−1h−1) in high light (150 and 200 µmol m−2s−1) adapted cultures. Maximum laboratory N2 fixation rates were ~6 to 8-fold higher than literature-derived field rates of the H. hauckii symbiosis. In contrast to published results on the Rhizosolenia-Richelia symbiosis, the H. hauckii symbiosis did not use nitrate when added, although ammonium was consumed by the H. hauckii symbiosis. Symbiont-free host cell cultures could not be established; however, a symbiont-free H. hauckii strain was isolated directly from the field and grown on a nitrate-based medium that would not support DDA growth. Our observations together with literature reports raise the possibility that the asymbiotic H. hauckii are lines distinct from an obligately symbiotic H. hauckii line. While brief descriptions of successful culture isolation have been published, this report provides the first detailed description of the approaches, handling, and methodologies used for successful culture of this marine symbiosis. These techniques should permit a more widespread laboratory availability of these important marine symbioses.

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Heinbokel, John F. « OCCURRENCE OF RICHELIA INTACELLULARIS (CYANOPHYTA)WITHIN THE DIATOMMMS HEMIAULUS HAUKII ADN H. MEMBRANACEUS OFF HAWAII ». Journal of Phycology 22, n^o 3 (septembre 1986) : 399. http://dx.doi.org/10.1111/j.1529-8817.1986.tb00043.x.

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Zeev, Edo Bar, Tali Yogev, Dikla Man-Aharonovich, Nurit Kress, Barak Herut, Oded Béjà et Ilana Berman-Frank. « Seasonal dynamics of the endosymbiotic, nitrogen-fixing cyanobacterium Richelia intracellularis in the eastern Mediterranean Sea ». ISME Journal 2, n^o 9 (26 juin 2008) : 911–23. http://dx.doi.org/10.1038/ismej.2008.56.

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Jahson, S., A. N. Rai et B. Bergman. « Intracellular cyanobiont Richelia intracellularis : ultrastructure and immuno-localisation of phycoerythrin, nitrogenase, Rubisco and glutamine synthetase ». Marine Biology 124, n^o 1 (novembre 1995) : 1–8. http://dx.doi.org/10.1007/bf00349140.

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Austin, PhD, FDRT, FALS, David R. « Recreational Therapy for Older Adults, Nancy E. Richeson and Betsy Kemeny. Urbana, IL : Sagamore-Venture, 2019. » American Journal of Recreation Therapy 18, n^o 1 (1 janvier 2019) : 46–48. http://dx.doi.org/10.5055/ajrt.2019.0182.

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Ottewill, Chris. « The role of convexity in defining regular polyhedra ». Mathematical Gazette 108, n^o 571 (15 février 2024) : 61–68. http://dx.doi.org/10.1017/mag.2024.10.

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It is almost twenty years since Branko Grünbaum lamented that the ‘original sin’ in the theory of polyhedra is that from Euclid onwards “the writers failed to define what are the ‘polyhedra’ among which they are finding the ‘regular’ ones” ([1, p. 43]). Various definitions of ‘regular’ can be found in the literature with a condition of convexity often included (e.g. [2, p. 301], [3, p. 77], [4, p. 47], [5, p. 435], [6, p. 16]). The condition of convexity is usually cited to exclude regular self-intersecting polyhedra, i.e. the Kepler-Poinsot polyhedra, such as the ‘great dodecahedron’ consisting of twelve intersecting pentagonal faces shown in Figure 1 with one face shaded. Richeson also notes ([4, pp. 47-48]) that, for a particular definition of ‘regular’, convexity is needed to exclude the ‘punched-in’ icosahedron shown in Figure 2.

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Winfield, Ignacio, Michel E. Hendrickx et Manuel Ortiz. « A new deep-water species of Trischizostoma (Crustacea : Amphipoda : Gammaridea : Trischizostomatidae) from western Mexico, NE Pacific Ocean ». Journal of the Marine Biological Association of the United Kingdom 97, n^o 1 (22 février 2016) : 141–49. http://dx.doi.org/10.1017/s0025315416000187.

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A new species of Trischizostoma collected at depths of 1392–1420 m from western Mexico is described. It represents the first record of the genus in the NE Pacific. The new species is morphologically similar to T. circulare, T. tohokuense and T. richeri. These species all share a large rostrum, expanded eyes and an entire telson. Distinctive characters of the new species include a dorsally unnotched urosomite 1, a subconical coxa 2, a subtriangular propodus of gnathopod 1, a single seta and one protuberance on the palm of gnathopod 2, the presence of 10 spine-teeth in the outer plate of maxilla 1 and of a large, 1-articulate maxilla 1 palp, and the telson with 2 minute simple setae and 2 minute projections distally.

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Tirkey, Anima, Hitesh Solanki, Aswathy Vijaya Krishna, Mini Raman, Syed Moosa Ali et Arvind Sahay. « Seasonal Dynamics of Trichodesmium and Phytoplankton Communities in the Eastern Arabian Sea : Winter Vs Spring-inter monsoon ». Western Indian Ocean Journal of Marine Science 23, n^o 2 (9 octobre 2024) : 23–39. http://dx.doi.org/10.4314/wiojms.v23i2.3.

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The filamentous marine cyanobacterium Trichodesmium forms extensive blooms in tropical seas, where it plays an important role in nitrogen fixation. This study investigated Trichodesmium-associated phytoplankton in the Eastern Arabian Sea (EAS) during bloom and nonbloom conditions. Trichodesmium blooms over the continental shelf primarily comprised of T. erythraeum and T. thiebautii during the Spring Inter Monsoon (SIM) and T. erythraeum during the Winter Monsoon (WM). T. erythreaum blooms have rarely been reported from the north-east Arabian Sea during WM. Trichomes comprised of 143-1552 cells during the WM, with filaments ranging from 1339 to 13163 µm in length. Non-diazotrophic groups like diatoms and dinoflagellates were associated with Trichodesmium during both seasons within the bloom waters. The study found a novel symbiotic relationship between the heterocystous diazotroph Richelia intracellularis and Nitzschia sicula during WM blooms. This research expands knowledge of lesser-known phytoplankton species and their associations in the EAS.

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Ru, Y., C. Ai, S. S. Li, S. K. Gong et Y. L. Pei. « Two-phase microstructural evolution at high temperatures for γ′-richen single crystal superalloys ». Materials Research Innovations 19, sup4 (mai 2015) : S214—S219. http://dx.doi.org/10.1179/1432891715z.0000000001548.

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