Academic literature on the topic 'L. humile'
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Journal articles on the topic "L. humile"
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Cordonnier, Marion, Olivier Blight, Elena Angulo, and Franck Courchamp. "The Native Ant Lasius niger Can Limit the Access to Resources of the Invasive Argentine Ant." Animals 10, no. 12 (December 21, 2020): 2451. http://dx.doi.org/10.3390/ani10122451.
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Within ant communities, the biotic resistance of native species against invasive ones is expected to be rare, because invasive species are often highly dominant competitors. The invasive Argentine ant (Linepithema humile (Mayr)) often demonstrated numerical dominance against its opponents, increased aggressiveness, and ability to quickly recruit to food. The present study aimed to assess the behavioral mechanisms involved in the interspecific competition between L. humile, facing either an invasive species (Lasius neglectus Van Loon, Boomsma and Andrásfalvy) or a native dominant species (Lasius niger (Linnaeus)). The resource exploitation by the Argentine ant was investigated during one-hour competitive interactions using 10 dead Drosophila flies as prey. When facing La. niger, L. humile exploratory behavior was strongly inhibited, it brought very few prey resources, and killed few opponents. Conversely, La. neglectus had a low impact on L. humile. Contrarily to expectations, the invasive La. neglectus lacked the ability to hinder L. humile resource exploitation, whereas the native La. niger did. These results suggest that La. niger could impact invasive populations of L. humile by interference competition, perhaps better so than some invasive species. While L. humile has become invasive in Southern Europe, the invasion process could be slowed down in the northern latitudes by such native dominant species.
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Rodriguez-Cabal, Mariano A., Katharine L. Stuble, Martin A. Nuñez, and Nathan J. Sanders. "Quantitative analysis of the effects of the exotic Argentine ant on seed-dispersal mutualisms." Biology Letters 5, no. 4 (May 22, 2009): 499–502. http://dx.doi.org/10.1098/rsbl.2009.0297.
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Although it is increasingly clear that exotic invasive species affect seed-dispersal mutualisms, a synthetic examination of the effect of exotic invasive species on seed-dispersal mutualisms is lacking. Here, we review the impacts of the invasive Argentine ant ( Linepithema humile ) on seed dispersal. We found that sites with L. humile had 92 per cent fewer native ant seed dispersers than did sites where L. humile was absent. In addition, L. humile did not replace native seed dispersers, as rates of seed removal and seedling establishment were all lower in the presence of L. humile than in its absence. We conclude that potential shifts in plant diversity and concomitant changes in ecosystem function may be a consequence of Argentine ant invasions, as well as invasions by other ant species. Because very few studies have examined the effects of non-ant invasive species on seed-dispersal mutualisms, the prevalence of disruption of seed-dispersal mutualisms by invasive species is unclear.
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Tena, A., C. D. Hoddle, and M. S. Hoddle. "Competition between honeydew producers in an ant–hemipteran interaction may enhance biological control of an invasive pest." Bulletin of Entomological Research 103, no. 6 (August 14, 2013): 714–23. http://dx.doi.org/10.1017/s000748531300045x.
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AbstractAsian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae), is an invasive citrus pest in southern California, which secretes honeydew and has the potential to spread a lethal bacterial disease, huanglongbing, of citrus. In urban citrus, Argentine ant, Linepithema humile (Mayr) (Hymenoptera: Formicidae), also an invasive pest, tends honeydew-producing hemipterans. We used field data to determine whether the mutualistic relationship between L. humile and six established species of honeydew producers may hinder or favor the establishment of D. citri and its biological control with Tamarixia radiata (Waterston) (Hymenoptera: Eulophidae) in citrus via competition or mutualism for ants, respectively. In the field, L. humile and D. citri are engaged in a mutualistic relationship. Ants harvest solid honeydew secreted by psyllid nymphs and tended more than 55% of observed D. citri colonies. Linepithema humile displayed a preference hierarchy when tending honeydew producers infesting citrus. It responded equally or less intensively to D. citri than to other honeydew-producing species. Consequently, the mutualism between L. humile and D. citri was affected by the presence of other honeydew-producing species, and the percentage of D. citri colonies tended by L. humile. The number of ants per D. citri colony also decreased as the number of other honeydew producers increased. Diaphorina citri density was also affected by the presence of other honeydew producers. Both colony size and the number of D. citri nymphs counted per tree decreased as the number of other honeydew producers increased. Our results indicate that competition between honeydew producers for the mutualist ant L. humile may hinder the establishment of D. citri by possibly facilitating increased biological control.
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Sakamoto, Yoshiko, Takehiko I. Hayashi, Maki N. Inoue, Hitoshi Ohnishi, Toshio Kishimoto, and Koichi Goka. "Effects of Fipronil on Non-target Ants and Other Invertebrates in a Program for Eradication of the Argentine Ant, Linepithema humile." Sociobiology 66, no. 2 (August 20, 2019): 227. http://dx.doi.org/10.13102/sociobiology.v66i2.3772.
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Pesticides are frequently used to eradicate invasive ant species, but pose ecological harm. Previous studies assessed non-target effects only in terms of the increase or decrease of abundance or species richness after pesticide applications. Positive effects of the release from pressure caused by invasive ant species have not been considered so far. To more accurately assess pesticide effects in the field, the non-target effects of pesticides should be considered separately from the positive effects of such releases. Here, we used monitoring data of ants and other invertebrates collected in a program for the eradication of the Argentine ant, Linepithema humile (Mayr), using fipronil. First, we separately assessed the effects of L. humile abundance and fipronil exposure on non-target ants and other invertebrates using generalized linear models. The abundance of L. humile and the number of pesticide treatments were negatively associated with the total number of non-target individuals and taxonomic richness. We also noted negative relationships between the number of individuals of some ant species and other invertebrate taxonomic groups. The L. humile × pesticide interaction was significant, suggesting that the abundance of L. humile affected the level of impact of pesticide treatment on non-target fauna. Second, we evaluated the dynamics of non-target ant communities for 3 years using principal response curve analyses. Non-target ant communities treated with fipronil continuously for 3 years recovered little, whereas those treated for 1 year recovered to the level of the untreated and non-invaded environment.
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Rust, Michael K., Donald A. Reierson, and John H. Klotz. "Pest Management of Argentine Ants (Hymenoptera: Formicidae)1." Journal of Entomological Science 38, no. 2 (April 1, 2003): 159–69. http://dx.doi.org/10.18474/0749-8004-38.2.159.
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Control of Argentine ants, Linepithema humile (Mayr), around structures in urban settings requires an extensive and thorough use of existing registered sprays and baits. Barrier sprays must be thoroughly applied at maximum label rates to prevent ants from accessing structures. Although insecticides with systemic activity such as imidacloprid and thiamethoxam may ultimately reduce homopteran food sources for L. humile, quantifying the impact of such reductions has been difficult. Applications of bifenthrin and deltamethrin granules provide short-term reductions. Most commercial baits available for L. humile are not readily consumed by foragers, or they provide too rapid kill of workers. Consequently, none of the baits are consistently effective. Potential new active ingredients for baits such as fipronil, imidacloprid, and thiamethoxam provide about 50% kill within 3 days and are readily accepted by foragers. These toxicants are extremely promising in liquid bait formulations. No single control strategy or treatment has been consistently effective.
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Devenish, Adam J. M., Rosemary J. Newton, Jon R. Bridle, Crisanto Gomez, Jeremy J. Midgley, and Seirian Sumner. "Contrasting responses of native ant communities to invasion by an ant invader, Linepithema humile." Biological Invasions 23, no. 8 (April 3, 2021): 2553–71. http://dx.doi.org/10.1007/s10530-021-02522-7.
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AbstractInvasive alien species pose a serious threat to the integrity and function of natural ecosystems. Understanding how these invaders alter natural communities is therefore an important aspect in predicting the likely future outcomes of biological invasions. Many studies have documented the consequences of invasive alien species on native community structure, through the displacement and local extinction of native species. However, sampling methods and intensities are rarely standardised across such studies, meaning that it is not clear whether differences in response among native communities to the same invader species are due to biological differences between the invaded regions, or differences in the methodologies used. Here we use a matched sampling methodology to compare the effects of the Argentine ant (Linepithema humile Mayr) on native ant community assemblages in two distinct biogeographical regions that share similar ecologies: Girona (Spain) and Jonkershoek Nature Reserve (South Africa). We found a strong negative association between L. humile presence and native ant species richness within both geographic regions. However, the effects differed between the two study regions: in Girona, a single native ant species (Plagiolepis pygmaea) persisted in invaded sites; by contrast, substantially more native ant species persisted at invaded sites in Jonkershoek Nature Reserve. In addition, in Jonkershoek Nature Reserve, the abundance of certain native species appeared to increase in the presence of L. humile. This study therefore demonstrates the potential variable effects of an invasive species in contrasting locations within different biogeographical regions. Future work should explore the causes of this differential resistance among communities and expand standardised sampling approaches to more invaded zones to further explore how local biotic or abiotic conditions of a region determine the nature and extent of impact of L. humile invasion on native ant communities.
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Morita, Hiroshi, and Jun'ichi Kobayashi. "Daphnezomines L, M, N, and O, new alkaloids from Daphniphyllum humile." Tetrahedron 58, no. 33 (August 2002): 6637–41. http://dx.doi.org/10.1016/s0040-4020(02)00737-8.
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ESCÁRRAGA, MAYRON, and ROBERTO J. GUERRERO. "The ant genus Linepithema (Formicidae: Dolichoderinae) in Colombia." Zootaxa 4208, no. 5 (December 19, 2016): 446. http://dx.doi.org/10.11646/zootaxa.4208.5.3.
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The species of Linepithema Mayr in Colombia are reviewed from collection material. The genus Linepithema comprises 20 species, of which the following are reported in Colombia: L. angulatum (Emery), L. dispertitum (Forel), L. gallardoi (Brèthes), L. humile (Mayr), L. iniquum (Mayr), L. neotropicum Wild, L. piliferum (Mayr), L. tsachila Wild, and a new species, Linepithema hirsutum sp. nov. Linepithema dispertitum is a new record for Colombia and South America. A taxonomic key (English and Spanish) and distribution maps to the species of Linepithema in Colombia are provided.
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SONG, ZI-WEI, XIAO-FENG XUE, and XIAO-YUE HONG. "Six new species of Aculus Keifer from Tibet Autonomous Region, China (Acari: Eriophyoidea: Eriophyidae: Phyllocoptinae)." Zootaxa 2305, no. 1 (December 7, 2009): 1–23. http://dx.doi.org/10.11646/zootaxa.2305.1.1.
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Six new species of Aculus Keifer from China are described and illustrated. They are Aculus vignaus sp. nov. on Vigna vexillata (L.) Rich. (Fabaceae); Aculus jasmini sp. nov. on Jasminum humile L. (Oleaceae); Aculus sorbariae sp. nov. on Sorbaria sorbifolia (L.) A. Br. (Rosaceae); Aculus tibetsalicinus sp. nov. on Salix sp. (Salicaceae); Aculus lhasasorbariae sp. nov. on Sorbaria sp. (Rosaceae) and Aculus cheilophilanus sp. nov. on Salix cheilophila Schneid (Salicaceae). All the eriophyoid mite species described here are vagrants on the undersurface of host leaves. A key to the Chinese Aculus species is also provided.
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RASINGAM, L., and K. KARTHIGEYAN. "Elatostema perryi a new name for Elatostema humile L.M. Perry (Urticaceae)." Phytotaxa 394, no. 1 (February 25, 2019): 118. http://dx.doi.org/10.11646/phytotaxa.394.1.10.
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The genus Elatostema J. R. Forst. & G. Forst. belongs to the tribe Elatostemateae Gaudich. (1830: 493) of the family Urticaceae. It is one of the largest genera in the family with c. 626 accepted names and mostly distributed from tropical to subtropical regions of Africa, Asia and Oceania (Tseng & Hu, 2015; Lin et al. 2018; Fu et al. 2019). Recently, Tseng et al. (2019) provided a new circumscription for the Elatostema S.l. based on the molecular phylogenetic studies and morphological characters. Perry (1951), while studying the New Guinean flora, described Elatostema humile L. M. Perry (1951: 378) from the Idenburg river of New Guinea. This is a later homonym of the Fijian species Elatostema humile A.C. Sm. (1942: 22) and so illegitimate according to article 53.1 of ICN (Turland et al. 2018). Therefore, a replacement name, Elatostema perryi is proposed here.
Dissertations / Theses on the topic "L. humile"
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Periotto, Fernando. "Efeito alelopático de Andira humilis Mart.ex Benth. e de Anacardium humile Mart. na germinação e no crescimento de Lactuca sativa L. e de Raphanus sativus L." Universidade Federal de São Carlos, 2003. https://repositorio.ufscar.br/handle/ufscar/2040.
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Previous issue date: 2003-09-11Universidade Federal de Sao Carlos
Observações em campo, nas áreas de reserva de Cerrado da Universidade Federal de São Carlos e da Represa do Lobo (Itirapina), indicam que as duas espécies estudadas neste trabalho, Andira humilis Mart. Ex Benth. e Anacardium humile Mart., desenvolvem-se formando espaços entre elas e outras espécies que se desenvolvem ao seu redor. Resultados obtidos em testes preliminares, utilizando-se extratos aquosos de caules e folhas de ambas espécies, demonstraram efeitos inibitórios na germinação de sementes e no desenvolvimento de plântulas de alface (Lactuca sativa L.), confirmando a hipótese da presença de agentes alelopáticos. No presente trabalho, foram estudados os efeitos alelopáticos de extratos aquosos de caules e de folhas de Andira humilis e de Anacardium humile na germinação de sementes e no crescimento plântulas de Raphanus sativus L. (rabanete) e Lactuca sativa L. (alface), ambas utilizadas como bioindicadores. Efetuou-se, também, a análise dos princípios ativos responsáveis pelos efeitos alelopáticos ocasionados por folhas de Andira humilis, procurando-se definir a(s) classes(s) química(s) a que pertencem. Os extratos a 50,75 e 100% de caules e folhas de Andira humilis, em sementes de alface e rabanete, produziram redução significativa na velocidade de germinação e, a 100% de caules, a porcentagem de germinação foi significativamente reduzida. Em Anacardium humile, a porcentagem de germinação foi reduzida significativamente, apenas em semente de rabanete, por ação do extrato de folhas em concentração de 50%. Sementes de alface sofreram redução significativa na velocidade de germinação na presença de extratos de folhas de Anacardium humile em todas as concentrações. Entretanto, a velocidade de germinação em sementes de rabanete foi reduzida significativamente, pela ação dos extratos de caules na concentração de 50% e de folhas, nas concentrações 50, 75, 100%. Plântulas de alface e rabanete sofreram inibição significativa, em seu comprimento, pelos extratos de Andira humilis, exceto os extratos de folhas a 25 e 75%, os quais não causaram inibição em rabanete. Extrattos de caules de Anacardium humile inibiram significativamente o comprimento de plântulas de alface e rabanete, porém os extratos de folhas a 25 e 75% não inibiram o crescimento de plântulas de alface. A interferência dos extratos aquosos, de ambas espécies de Cerrado estudadas, na germinação e no crescimento em alface e rabanete, foi desassociada de qualquer efeito do potencial osmótico e do pH, indicando, portanto, atividade alelopática. Os resultados obtidos na identificação da classe química do(s) composto(s) responsável(is) pela atividade alelopática ocorrida, apontam que as moléculas do metabolismo secundário presentes nas folhas de Andira humilis, responsáveis por tais efeitos alelopáticos na germinação de sementes e no crescimento de plântulas de alface e de rabanete, pertençam à classe dos taninos.
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Gonçalves, Elaine Mendes. "Efeito das sementes de Linum usitatissimum L. var. humile (Mill.) Pers. (linhaça marrom) no aparelho reprodutor de ratas ovariectomizadas." Universidade Federal do Maranhão, 2014. http://tedebc.ufma.br:8080/jspui/handle/tede/1631.
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Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA)
The hormone replacement therapy is the most effective way for the treatment of conditions related to post-menopause, but is related to the presence of undesirable effects. In this situation, safer alternatives have been investigated for the treatment of menopausal symptoms arising, such as the use of phytoestrogens. Seeds of Linum usitatissimum L. (flaxseed) are rich in lignan precursor, which is converted to substances which are structurally similar to estrogen. This study evaluates the effect of the hydro alcoholic extract of the seeds of L. usitatissimum on the reproductive tract of ovariectomized female Wistar rats. The seeds were crushed and remacerated and three times in 70% ethanol in the ratio 1:3 (v/v) for 24 hours to obtain the extract. Adult rats (80 days) from Rattus norvegicus species, divided into 6 groups (n = 5-6) were used: sham operated (FO) and ovariectomized (OVR) administered distilled water/3% cremophor (0.1 ml/100g, v. o.); estradiol benzoate (BE), ovariectomized treated with estradiol benzoate at a dose of 10 μg/kg (s. c.) and three ovariectomized groups treated with the extract of L. usitatissimum at doses of 100 mg/kg (LIN100), 250 mg/kg (LIN250) or 500 mg/kg (LIN500). The rats were ovariectomized and 21 days after surgery, received daily treatments, for two months, when it was rated the estrous cycle, body weight and food consumption. At the end of this period, blood was collection and subsequent biochemical and hormonal analyzes, and organ weighing, uterine reactivity and uterus, vagina and breasts histology. In the analysis of the estrous cycle, the OVR group had a higher frequency in the diestrus stage during the 2 months. The LIN100 group showed up 100% in diestrus and LIN250, 94.5% (1st month) and 93.5% (2nd month). At the highest dose tested (LIN500 group), flaxseed showed in the 2nd month of treatment, 14.3% of pro-estrus and diestrus 61.9%. The BE group reached 100% of estrus in the 2nd month. Ovariectomy induced body weight gain in OVR group (19.6%) which was prevented in the groups LIN and BE. Moreover, the groups treated with the extract did not alter uterus weight in relation to OVR, which showed a decrease of 83.4% compared to the FO. However, in BE, were increased by 80.5% the uterus weight. Ovariectomy induced intra-abdominal fat gain which was reduced to 47.9% in the LIN500 group 35.5% and 45.8% in BE group. In biochemical analyzes no differences between the groups was observed. In hormone dosage, OVR group decreased by 75.3% in estradiol compared to FO, whereas in the groups treated with the extract showed no differences compared to OVR. In relation to progesterone, there was no difference between groups. Uterine responsiveness to carbachol, PGF2α and oxytocin was decreased with ovariectomy and L. usitatissimum extract did not alter this effect. Histomorphometric analysis of the uterus, LIN500 group showed a significant increase in the luminal epithelium of the uterus in 12.8%, when compared to the OVR group. The other parameters did not differ, as well as the breasts histomorphometry. Therefore, the hydro alcoholic extract of L. usitatissimum has potential as an alternative to therapy in postmenopausal women, as it showed cytological parameters and on adipose tissue effects, without stimulating breast and endometrial tissues.
A terapia de reposição hormonal é forma mais eficaz para o tratamento de sinais e sintomas da pós-menopausa, entretanto está relacionada à presença de efeitos indesejáveis. Por esse motivo, tem-se buscado alternativas mais seguras para o controle destes sintomas, como o uso de fitoestrógenos. As sementes de Linum usitatissimum L. (linhaça) são ricas em um precursor de lignana, que é convertido no intestino em substâncias que se assemelham estruturalmente ao estrogênio. Este trabalho objetivou avaliar o efeito do extrato hidroalcoólico das sementes de L. usitatissimum no aparelho reprodutor de ratas Wistar ovariectomizadas. As sementes foram turbolizadas e remaceradas três vezes em etanol 70% na proporção 1:3 (v/v), por 24 horas, para a obtenção do extrato. Foram utilizadas ratas adultas (80 dias) da espécie Rattus norvegicus, distribuídos em 6 grupos (n=5-6): grupo falso operado (FO) e grupo ovariectomizado (OVR), administrados com água destilada/cremofor a 3% (0,1 mL/ 100g, v.o.); grupo benzoato de estradiol (BE), ovariectomizado tratado com estradiol na dose de 10 μg /kg (s.c.) e outros três grupos ovariectomizados tratados, por via oral, com o extrato de L. usitatissimum nas doses de 100 mg/kg (LIN100), 250 mg/kg (LIN250) ou 500 mg/kg (LIN500). As ratas foram ovariectomizadas e, após 21 dias da cirurgia, receberam diariamente os tratamentos, por 2 meses, período que foi avaliado ciclo estral, peso corporal e consumo alimentar. Ao final do tratamento, o sangue foi coletado para análises bioquímica e hormonal, além da pesagem de órgãos, reatividade uterina e histologia do útero, vagina e mamas. Na análise do ciclo estral, o grupo OVR permaneceu com maior frequência na fase diestro durante os 2 meses. O grupo LIN100 apresentou-se 100% em diestro e o LIN250, 94,5% (1º mês) e 93,5% (2º mês). Na maior dose testada (grupo LIN500), a linhaça mostrou, no 2º mês, 14,3% de pró-estro e 61,9% de diestro. O grupo BE atingiu 100% de estro no fim do tratamento. A ovariectomia induziu aumento de peso corporal no grupo OVR (19,6%), que foi prevenido nos grupos LIN e BE. Além disso, os grupos tratados com o extrato não alteraram o peso uterino em relação ao OVR, que mostrou uma redução de 83,4% em comparação ao FO. Porém, no BE, houve aumento de 80,5% do peso uterino. A ovariectomia induziu um aumento na gordura intra-abdominal em 47,9% que foi reduzida no grupo LIN500 em 35,5% e no grupo BE em 45,8%. Nas análises bioquímicas não foi observada diferenças entre os grupos. Já na dosagem hormonal, o grupo OVR mostrou redução de 75,3% do estradiol em relação ao FO, enquanto que nos grupos tratados com o extrato não houve diferença em relação ao OVR. Para a progesterona, não houve diferença entre os grupos. A reatividade uterina ao carbacol, prostaglandina F2α e ocitocina foi diminuída com a ovariectomia, porém não foi alterada com o extrato de L. usitatissimum. Na análise histomorfométrica do útero, o grupo LIN500 mostrou um discreto aumento do epitélio luminal uterino em 12,8%, quando comparado ao grupo OVR. Para os outros parâmetros não houve diferenças, assim como na histomorfometria das mamas. Portanto, o extrato hidroalcoólico de L. usitatissimum apresenta potencial como alternativa à terapêutica na pós-menopausa, pois mostrou efeitos em parâmetros citológicos e tecido adiposo, sem estimular tecidos mamário e endometrial.
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Altfeld, Laura F. "Interspecific interactions among common insects of the salt myrtle, Baccharis halimifolia L. (Asteraceae)." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001578.
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Berville, Laurence. "La fourmi d’Argentine (Linepithema humile) face à une fourmi dominante du genre Tapinoma en milieu insulaire : écologie chimique, comportement et dynamique d’invasion." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4324.
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La fourmi d'Argentine (Linepithema humile) est une des espèces invasives parmi les plus nuisibles au monde. Dans le cadre des invasions biologiques, les résistances biotiques sont souvent les dernières barrières des écosystèmes. Une hypothèse, jamais testé in natura, de résistance de la part d'une fourmi du genre Tapinoma face à L. humile a été émise. Pour le démontrer, nous avons choisi d'expérimenter en laboratoire et in natura. Nos terrains d'études privilégiés ont été, outres des sites du littoral méditerranéen français, 4 îles situées en face du littoral envahi par la fourmi d'Argentine. Parmi celles-ci, deux contiennent à la fois la fourmi d'Argentine et des espèces du genre Tapinoma. L'identification difficile des espèces du genre Tapinoma étant sujette à une controverse scientifique, nous avons dû différencier de façon certaine cinq d'entre elles, par leurs morphologies et leurs signatures chimiques. En Provence, trois espèces ont été observées : T. erraticum, T. madeirense et T. nigerrimum. Sur l'île de Ratonneau, un suivi sur 2 ans de la vitesse d'invasion de L. humile en milieu naturel, avec ou sans T. nigerrimum, met en évidence une vitesse d'invasion très faible, voire un recul dans la zone à T. nigerrimum. Les colonies de T. nigerrimum de l'île de Ratonneau semblent faire obstacle à la progression de l'invasion. Des études comportementales préliminaires, conduites en laboratoire, entre fragments de nids de T. nigerrimum et L. humile nous avaient permis de confirmer les capacités de T. nigerrimum à résister face à l'invasive. Ainsi, les ouvrières T. nigerrimum défendent mieux leurs territoires, allant jusqu'à accaparer celui des L. humileThe Argentine ant (Linepithema humile) is one of the world's worst invasive species. We used various analyses to determine its invasion pattern on the Provence coast, confirming the presence of a second supercolony. Chemical and behavioral analyses of worker interactions on the supercolony border identified a peaceful border zone. When biological invasion occurs, biotic resistance is often ecosystems' last defense. Could a dominant ant from Tapinoma genus resist L. humile invasion? To demonstrate this possibility, we conducted both laboratory and in natura experiements. Besides the invaded Mediterranean coast, we selected four nearby islands, two of which were found to contain both L. humile and Tapinoma spp. Identification of Mediterranean Tapinoma being controversial, we used both morphological and chemical analyses to ensure reliable discrimination. On the coast, we found T. erraticum, T. madeirense and T. nigerrimum. In natura, on Ratonneau Island, two-year field monitoring showed a slow rate of Argentine ant invasion and even retreat, faced with T. nigerrimum. T. nigerrimum colonies seem to block L. humile invasion. Laboratory behavioral studies between nests of T. nigerrimum and L. humile confirm T. nigerrimum's ability to stand up to Argentine ants: T. nigerrimum workers protect and defend their territories better, even taking over Argentine ant nests
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Sacoman, Juliana Lessa. "Atividade anticancer e mecanismo de morte celular dos extratos brutos e frações de Anacardium humile St. Hill. (Anacardiaceae) e Pothomorphe umbellata (L.) Miquel (Piperaceae)." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317628.
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Orientadores: João Ernesto de Carvalho, Mary Ann FoglioDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: Os primeiros registros históricos da humanidade já relatavam o uso.de plantas para tratamento de diversos males e, com o aprimoramento dos estudos e técnicas de purificação, isolamento e identificação dos princípios ativos, foi possível o desenvolvimento de medicamentos para utilização em diversas patologias, inclusive na quimioterapia do câncer. Este trabalho teve como objetivo avaliar a atividade anticâncer de duas espécies da flora brasileira, Anacardium humile St. Hil. e Pothomorphe umbellata (L.) Miquel, de uso medicinal popular. Os extratos brutos diclorometânico (EBD) e etanólico (EBE) das folhas dessas espécies foram avaliados em ensaio de citotoxicidade in vitro em cultura de células tumorais humanas. Como o EBD de P. umbellata apresentou o melhor perfil de atividade in vitro, foi selecionado para avaliação em modelo de câncer murino, o tumor ascítico de Ehrlich. Nesse modelo, esse extrato apresentou atividade anti-tumoral dose dependente e, com isso, a identificação dos princípios responsáveis por essa atividade tomou-se fundamental. Desse modo, o EBD foi submetido a diversos procedimentos cromatográficos, sendo as frações obtidas biomonitoradas pelo teste de citotoxicidade. Esse procedimento permitiu a identificação de duas frações com elevada potência e seletividade anticâncer, sendo que na primeira fração (A) foram identificados derivados do ácido oxálico e na segunda (C), esteróides e triterpenos. A indução de morte celular por apoptose, avaliada por imunocitoquímica, foi significativa nas células UACC-62, OVCAR-3 e NCIADR/ RES quando tratadas pela fração A e nas células UACC-62, OVCAR-3 e 786-0, quando tratadas pela fração C. Uma outra fração (B), constituída principalmente do composto 4-nerolidilcatecol, não apresentou atividade anticâncer significativa. Esses resultados estimulam a continuidade dos estudos com a P. umbellata, com o objetivo de identificar os princípios ativos, determinar o mecanismo de ação anticâncer e comprovar sua atividade em modelos experimentais de câncer in vivo
Abstract: Plants are used in folk medicine since old times of human history, and improvements in techonology, research, purification techniques, isolation and identification of active principIes have allowed the discovery and development of new molecules as drugs for terapheutics of many diseases, such as cancer. This work aimed the evaluation of the anticancer activity of two Brazilian species, Anacardium humile St. Hil. and Pothomorphe umbellata (L.) Miquel, used in folk medicine. Dichlorometanic (DCE) and ethanolic (ECE) crude extracts obtained from leaves of both species were tested in an in vitro citotoxicity assay against human cancer celllines. As long as P. umbellata's DCE showed the best anticancer activity profile, it was also evaluated in a murine cancer model, the Ehrlich Ascite Tumor (EAT). In this experiment, DCE also demonstrated a dose response relationship anticancer activity; therefore the isolation and identification of the active principIe responsible for that activity became the major focus of this work. As a result, DCE was submitted to many cromatographic procedures which were bioguided by the anticancer assay in vitro. This chromatographic purifications permitted identification of two main fractions with high potency and selectivity: fraction A consitituted by oxalic acid derivatives, and fraction C by steroids and triterpenes. The quantification of apoptosis induction by immuncytochemical analysis were significant for UACC-62, OVCAR-3 and NCI-ADR/ RES celllines treated with fraction A, whereas UACC-62, OVCAR-3 and 786- o cells lines went to apoptosis when exposed to fraction C. A third fraction, denominated fraction B, was rich in 4-nerolidylcathecol, widely knowm for this plant specie, and did not show any significative anticancer activity. These results encouraged following up on studies with P. umbellata, priorizing the identification of active principIes, the determination of anticancer mechanism of action and to prove the anticancer activity in experimental cancer models in vivo
Mestrado
Biologia Celular
Mestre em Biologia Celular e Estrutural
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Sagné, Valérie. "L' identité de la personne humaine." Toulouse 1, 2003. http://www.theses.fr/2003TOU10018.
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A la fois de l'ordre du public et de l'intime, l'identité de la personne humaine est au coeur des tensions entre objectivisme et subjectivisme. Parce que l'identité a pour fonction l'individualisation des personnes, son appréhension se réalise au moyen de critères objectifs et de procédures rigoureuses et contraignantes. L'individu a un devoir d'identification vis-à-vis du corps social. Parce que l'identité est ressentie comme l'unicité et l'altérité de chacun, elle est le siège de diverses revendications qui promeuvent la reconnaissance des spécificités identitaires. L'individu exige un droit au respect de son identité. Si l'approche subjectiviste a su imprimer sa marque sur la définition des principaux éléments de l'identité que sont le nom, le sexe et la filiation, la qualification juridique de la notion hésite entre instrument de police et droit de la personnalité. En raison des incertitudes conséquentes dans le droit des personnes et des risques encourus par le principe d'égalité civile, et afin que la règle de droit ne devienne pas personnelle, particulière et relative, cette progression du subjectivisme au sein de la science juridique appelle une résistance et une réaction du droitHuman person's identity being both dependent on the public and private life, it is split between objectivism and subjectivism. As identity aims at people's individualization, objective criteria as well as constraining and strict procedures are used. The individual's duty is to identify with society. Identity is felt as everyone's unicity and otherness and therefore it is the centre of several claims that put the recognition of the identity specificities forward. The individual calls for his/her own identity to be respected. The subjectivist movement has left traces on the definition of identity such as surname, sex and filiation whereas the legal definition of the notion still hesitates between the instrument of society and the individual rights. Because of these important uncertainties concerning the individual rights, because civil equality is at risk and law cannot become personal, particular and relative, law must resist and react to this subjectivism moving into the juridical science
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Durrive, Louis Triby Emmanuel Schwartz Yves. "L' expérience des normes formation, éducation et activité humaine /." Strasbourg : Université Louis Pasteur, 2006. http://eprints-scd-ulp.u-strasbg.fr:8080/00000513.
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Durrive, Louis. "L' expérience des normes : Formation, éducation et activité humaine." Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/restreint/theses_doctorat/2006/DURRIVE_Louis_2006.pdf.
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Dans la perspective de Canguilhem, l'expérience normative est le propre du vivant humain : " Tout homme veut être sujet de ses normes ". Quoi qu'on imagine en cherchant à imposer des cadres contraignants, l'être humain ne se laisse pas anticiper tel un automate. Il prend position face à la norme proposée, il a un point de vue forcément singulier. L'ergologie désigne ce pouvoir normatif de l'humain par le terme d'activité. Notre thèse explore les conséquences du concept en formation et en éducation. Dès lors que l'on exclut tout effet mécanique des environnements normatifs, comment interpréter les difficultés portant sur les apprentissages de base et sur l'insertion sociale et professionnelle ? Quel est le rapport au savoir de ceux qu'on tient pour " inéducables " ? Comment réconcilier l'effort de connaître avec l'effort de vivre ? Face à la performance des machines, comment décrire la spécificité humaine de la compétence ? L'expérience des normes – " l'activité " – n'est pas immédiatement disponible en un point de vue construit et communicable. C'est un véritable travail, un exercice à la fois de rigueur conceptuelle et d'humilité face à l'inédit de la vie. Ce retour d'activité s'organise sous certaines conditions décrites à partir d'une technique d'entretien fondée sur la double anticipation, saisie par repérage et ancrage. Les contenus recueillis donnent une idée des débats de valeurs qui médiatisent toujours l'activité et les savoirs, précisément parce qu'un être humain n'applique jamais à la manière d'un ordinateur un programme ou un prescrit quelconque. S'entraîner à découvrir sa propre activité est une voie pour faciliter les apprentissages et gagner en autonomieAccording to Canguilhem, experience of norms is peculiar to the human being : “every man wants to be reason for his norms”. A man's work cannot be fully foreseen as an automaton's task in spite of the organization attempts. The worker actually takes a stand on the proposed norm. He necessarily has a singular viewpoint. In the lexicon of ergology, this ability towards the norms is called “activity”. Our study analyses the consequences of this concept to vocational training and education. Our hypothesis rules out any mechanical effect of a normative environment. In this way of thinking, we can try to explain : a) the difficulties coming to the beginners with the basic skills and social integration ; b) the relation to knowledge among the young people seen as “uneducable” ; c) the need to retie the effort of knowing and the effort of living ; d) the importance of distinguishing the human competences from the machine's performance. Experience of norms – or “activity” – is not immediately expressed with structured speech. It is a real task to help someone to formulate his viewpoint. It requires both exactness and listening to perceive unforeseeable life. We suggest a method to interview people at work about their personal activity. It features two steps called “location” and “deep rooting in time”. We discover through the interview there are debates on values between activity and knowledge because the man never obeys orders like a computer does. To practise discovering one's own activity is a way not only to make learning easier but also to gain autonomy
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Rayé, Nathalie. "L' appréhension de la dignité humaine par le droit pénal." Nice, 2008. http://www.theses.fr/2008NICE0052.
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L’@appréhension de la dignité humaine par le droit pénal vise à analyser l’intégration dans l’ordre juridique d’une notion dépourvue de définition rationnelle originairement extérieure au droit car d’influence philosophico-religieuse. La dignité humaine a investi le droit de façon récente, aussi, et au-delà des controverses doctrinales, était-il nécessaire de s’intéresser de façon concrète à cette intégration juridique. Cette analyse permet de démontrer la consécration irréductible de la dignité humaine en droit. Si le droit pénal interne est le domaine d’analyse retenu pour ces recherches, le droit supra national entendu au sens de droits de l’homme ne doit pas être occulté eu égard à son influence sur la matière pénale. La place de la dignité dans les droits de l’homme permet d’affirmer sa conceptualisation en droit. Aussi le droit pénal ne pourra-t-il que consacrer la dignité humaine afin de lui faire produire des effets en droit. Cette conceptualisation irréductible de la dignité humaine conduit à en rechercher une protection pénale effective. Deux protections apparaissent complémentaires et tendent à l’humanisation du droit pénal, l’une est objective tandis que l’autre, plus contemporaine, est subjective. Si la protection pénale objective reste insuffisante en l’état du droit en raison des limites découvertes restreignant la protection effective malgré tout étendue de la dignité humaine, l’humanisation croissante de la matière permet de mettre en évidence une protection qui se subjectivise. Si cette protection pénale de la dignité est souhaitable car elle permet de prendre en considération l’individu en tant que personne, elle apparaît également problématique si des limites à l’extension du contenu conceptuel ne sont pas arrêtéesThe apprehension of human dignity by criminal law aims at analyzing integration in the legal order of a concept deprived of rational definition originally external to law because of philosophical and religious influences. Human dignity has recently invested law, also, and far beyond the doctrinal controversies, it was necessary to take interest in concrete ways in this legal integration. This analysis allows proving the irreducible dedication of human dignity. Even if internal criminal law is the main point of studies in this. Thesis, supra national law in the meaning of human rights should not be occulted regarding on its influence on the penal matter. The place of dignity in human rights allows assuring its conceptualization in law. In fact, criminal law will must devote human dignity in order to produce effects in law. This irreducible conceptualization of human dignity results in looking for an effective penal protection. Two protections appear complementary and tend to the humanization of criminal law, one is objective while the other, more contemporary, is subjective. Even if objective penal protection remains insufficient in the law matter because of the discovered limits restricting effective protection despite all extension of human dignity, the increasing humanization of the subject allows highlighting a protection which becomes subjective. Although this penal protection of dignity is desirable because it allows to take into account the individual as a person, it also appears problematic if limits to the extension of the conceptual contents are not stopped
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Pitt, Joel Peter William. "Modelling the spread of invasive species across heterogeneous landscapes." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/912.
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Invasive species are well known to cause millions of dollars of economic as well as ecological damage around the world. New Zealand, as an island nation, is fortunate because it has the opportunity to regulate and monitor travel and trade to prevent the establishment of new species. Nevertheless foreign species continue to arrive at the borders and continue to cross them, thus requiring some form of management. The control and management of a new incursion of an invasive species would clearly benefit from predictive tools that might indicate where and how quickly the species is likely to spread after it has established. During the process of spread an invasing species must interact with a complex and heterogeneous environment and the suitability of the habitat in a region determines whether it survives. Many dispersal models ignore such interactions and while they may be interesting theoretical models, they are less useful for practical management of invasive species. The purpose of this study was to create and investigate the behaviour of a spatially explicit model that simulates insect dispersal over realistic landscapes. The spatially explicit model (Modular Dispersal in GIS, MDiG) was designed as am open-source modular framework for dispersal simulation integrated within a GIS. The model modules were designed to model an an approximation of local diffusion, long distance dispersal, growth, and chance population mortality based on the underlying suitability of a region for establishment of a viable population. The spatially explicit model has at its core a dispersal module to simulate long distance dispersal based an underlying probability distribution of dispersal events. This study illustrates how to extract the frequency of long distance dispersal events, as well as their distance, from time stamped occurrence data, to fit a Cauchy probability distribution that comprises the dispersal module. An investigation of the long distance dispersal modules behaviour showed that, in general, it generated predictions of the rate of spread consistent with those of analytical partial differential and integrodifference equations. However, there were some differences. Spread rate was found to be mainly dependent on the measurement technique used to determine the invasion front or boundary, therefore an alternative method to determine the boundary of a population for fat-tailed dispersal kernels is presented. The method is based on the point of greatest change in population density. While previously it was thought that number of foci rather than foci size was more important in stratified dispersal and that finer resolution simulations would spread more quickly, simulations in this study showed that there is an optimal resolution for higher spread rates and rate of area increase. Additionally, much research has suggested that the observed lag at the beginning of an invasion may be due to lack of suitable habitats or low probability of individuals striking the right combination of conditions in a highly heterogeneous environment. This study shows an alternative explanation may simply be fewer dispersal event sources. A case study is described that involved the application of the spatially explicit dispersal model to Argentine ant spread to recreate the invasion history of that species in New Zealand. Argentine ant is a global invasive pest which arrived in New Zealand in 1990 and has since spread to both main islands of New Zealand, primarily through human mediated dispersal. The spatially explicit simulation model and its prediction ability were compared to that of a uniform spread model based on equivalent total area covered. While the uniform spread model gave more accurate predictions of observed occurrences early in the invasion process it was less effective as the invasion progressed. The spatially explicit model predicted areas of high probability of establishment (hot spots) consistent with where populations have been found but accuracy varied between 40-70% depending on the year of the simulation and parameter selection. While the uniform spread model sometimes slightly outperformed or was equivalent to the simulation with respect to accuracy early in the invasion process, it did not show the relative risk of establishment and was less effective later in the invasion when stochastic random events generated by the simulation model were averaged to represent trends in the pattern of spread. Additionally, probabilistic predictions as generated by the spatially explicit model allow the uncertainty of prediction to be characterised and communicated. This thesis demonstrates that heterogeneous spread models can give more insight and detail than one dimensional or homogeneous spread models but that both can be useful at different stages of the invasion process. The importance of compiling appropriate data on dispersal and habitat suitability to aid invasion management has been highlighted. Additionally, a number of important hypotheses that need to be addressed to increase understanding of how species interact with the complex environment, have been identified and discussed.
Books on the topic "L. humile"
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Rybak, Boris. L' identité humaine. Paris: J.-M. Place, 1990.
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Lannoy, Jacques-D. De. L' éthologie humaine. Paris: Presses universitaires de France, 1987.
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Crognier, Emile. L' écologie humaine. Paris: Presses universitaires de France, 1994.
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L' identité humaine. Paris: J.-M. Place, 1990.
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L' évolution humaine. Paris: Seuil, 1991.
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L' espèce humaine. [Paris]: Gallimard, 2000.
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Coluche. L' horreur est humaine. Paris: Michel Lafon, 1992.
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L' erreur humaine: Roman. Montréal: Leméac, 1991.
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d'Exaerde, George de Kerchove. L' Europe, société humaine. Luxembourg: Office des publications officielles des Communautés européennes, 1990.
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Zundel, Maurice. L' humble présence: Inédits de Maurice Zundel. Genève: Editions du Tricorne, 1986.
Find full textBook chapters on the topic "L. humile"
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Bindu, K. C., Sabina Gyawali, Sanjeev Luintel, Ripu M. Kunwar, Hammad Ahmad Jan, Rainer W. Bussmann, and Narel Y. Paniagua-Zambrana. "Jasminum humile L. Oleaceae." In Ethnobotany of the Himalayas, 1–8. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45597-2_130-1.
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KC, Bindu, Sabina Gyawali, Sanjeev Luintel, Ripu M. Kunwar, Hammad Ahmad Jan, Rainer W. Bussmann, and Narel Y. Paniagua-Zambrana. "Jasminum humile L. Oleaceae." In Ethnobotany of the Himalayas, 1–8. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45597-2_130-2.
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K. C., Bindu, Sabina Gyawali, Sanjeev Luintel, Ripu M. Kunwar, Hammad Ahmad Jan, Rainer W. Bussmann, and Narel Y. Paniagua-Zambrana. "Jasminum humile L. Oleaceae." In Ethnobotany of the Himalayas, 1103–10. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-57408-6_130.
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Santiesteban, E., C. Garcia Ple, and M. Morey. "Postfire Phenology of Chamaerops Humilis L. in a Mediterranean-Type Schrubland." In Responses of Forest Ecosystems to Environmental Changes, 851–52. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2866-7_192.
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Ma, Bin, and Jianming Xu. "Humic Acid-Bound Polycyclic Aromatic Hydrocarbons (PAHs) in Rhizosphere of Rice (Oryza sativa L.)." In Functions of Natural Organic Matter in Changing Environment, 567–71. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5634-2_102.
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Traversa, A., E. Loffredo, A. J. Palazzo, T. L. Bashore, and N. Senesi. "Enhancement of Germination and Early Growth of Different Populations of Switchgrass (Panicum virgatum L.) by Compost Humic Acids." In Functions of Natural Organic Matter in Changing Environment, 1051–54. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5634-2_194.
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Janssens, M., V. Rutunga, J. Mukamugenga, S. Mukantagengwa, and R. Marijnissen. "Improvement of Sweet potato (Ipomoea batatas (L.) Lam) Production with Fertilizer and Organic Inputs in Rwanda." In Challenges and Opportunities for Agricultural Intensification of the Humid Highland Systems of Sub-Saharan Africa, 201–15. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07662-1_17.
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Yetimwork, G. G., E. G. Awet, and M. Solomon. "Crop–Livestock Interaction for Improved Productivity: Effect of Selected Varieties of Field Pea (Pisum sativum L.) on Grain and Straw Parameters." In Challenges and Opportunities for Agricultural Intensification of the Humid Highland Systems of Sub-Saharan Africa, 137–48. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07662-1_12.
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Kathuli, P., A. R. Zaharah, and S. N. Nguluu. "Contribution of Gliricidia sepium Pruning and Fallow to Sweet Corn (Zea mays L. var. rugosa) Yield, Nitrogen Uptake, Release Pattern and Use Efficiency in a Humid Tropical Environment of Malaysia." In Just Enough Nitrogen, 235–51. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58065-0_16.
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"L′AUDITION." In Motricité humaine - Tome 1, 273–90. Presses de l'Université du Québec, 2002. http://dx.doi.org/10.2307/j.ctv18phd6h.9.
Full textConference papers on the topic "L. humile"
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Coelho, Jose P., Jerson G. Veiga, Ruben Elvas-Leitao, Amadeu F. Brigas, Ana M. Dias, and Maria C. Oliveira. "Composition and in vitro antioxidants activity of Chamaerops humilis L." In 2017 IEEE 5th Portuguese Meeting on Bioengineering (ENBENG). IEEE, 2017. http://dx.doi.org/10.1109/enbeng.2017.7889422.
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Kubota, Takumi. "Remediation of 153Gd-Contaminated Sand by Fulvic and Humic Materials Extracted From Fallen Cherry Leaves." In ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2010. http://dx.doi.org/10.1115/icem2010-40122.
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The remediation of sand contaminated with 153Gd has been investigated using natural organic substances extracted from fallen cherry leaves instead of artificial reagents. The initial fulvic and humic acid isolated from organic substances through acidic and basic treatments have a concentration of total organic carbon of 4500 mgC/L and 3340 mgC/L, and the capacities of their functional groups are 7.23 meq/gC and 2.76 meq/gC, respectively. The remediation capacity of both fulvic and humic acid is effective in the weakly acidic region. Remediation with a natural organic substance requires a much higher carbon concentration than EDTA owing to its weak complexation with metal ions. In comparison with the EDTA complexation constant, the experimental complexation constant (log β) of gadolinium with a natural organic substance at pH 5.5 was determined to be 10 at most.
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Zimbovskaya, M. M., N. A. Kulikova, O. I. Filippova, and D. A. Pankratov. "Autoradiographic study of the distribution of 55-iron(III)-EDTA chelate at the presence of humic substances in Triticum aestivum L." In Fifth International Conference of CIS IHSS on Humic Innovative Technologies «Humic substances and living systems». CLUB PRINT ltd., 2019. http://dx.doi.org/10.36291/hit.2019.zimbovskaya.066.
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Deutscher, Janik, Karlheinz Gutjahr, Roland Perko, Hannes Raggam, Manuela Hirschmugl, and Mathias Schardt. "Humid tropical forest monitoring with multi-temporal L-, C- and X-band SAR data." In 2017 9th International Workshop on the Analysis of Multitemporal Remote Sensing Images (MultiTemp). IEEE, 2017. http://dx.doi.org/10.1109/multi-temp.2017.8035264.
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Manda, Manuela. "USE OF HUMIC ACID AND GRAPE SEED EXTRACT IN PLANTING MATERIAL PRODUCTION OF PELARGONIUM PELTATUM L." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/52/s20.141.
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Lestari, Fitri, and Kumala Dewi. "Effects of humic acid on vegetative growth, yield, oxalic acid and betacyanin content of red amaranth (Amaranthus tricolor L.)." In THE 6TH INTERNATIONAL CONFERENCE ON BIOLOGICAL SCIENCE ICBS 2019: “Biodiversity as a Cornerstone for Embracing Future Humanity”. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015774.
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Ågren, Niklas D., Mats O. Westermark, Michael A. Bartlett, and Torbjörn Lindquist. "First Experiments on an Evaporative Gas Turbine Pilot Power Plant: Water Circuit Chemistry and Humidification Evaluation." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0168.
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The evaporative gas turbine (EvGT), also known as the humid air turbine (HAT) cycle, is a novel advanced gas turbine cycle that has attracted considerable interest for the last decade. This high efficiency cycle shows the potential to be competitive with Diesel engines or combined cycles in small and intermediate scale plants for power production — and/or cogeneration. A 0.6 MW natural gas fired EvGT pilot plant has been constructed by a Swedish national research group in cooperation between universities and industry. The plant is located at the Lund Institute of Technology, Lund, Sweden. The pilot plant uses a humidification tower with metallic packing in which heated water from the flue gas economizer is brought into direct counter current contact with the pressurized air from the compressor. This gives an efficient heat recovery and thereby a thermodynamically sound cycle. As the hot sections in high temperature gas turbines are sensitive to particles and alkali compounds, water quality issues need to be carefully considered. As such, apart from evaluating the thermodynamic and part load performance characteristics of the plant, and verifying the operation of the high pressure humidifier, much attention is focused on the water chemistry issues associated with the recovery and reuse of condensate water from the flue gas. A water treatment system has been designed and integrated into the pilot plant. This paper presents the first water quality results from the plant. The experimental results show that the condensate contains low levels of alkali and calcium, around 2 mg/l Σ(K,Na,Ca), probably originating from the unfiltered compressor intake. About 14 mg/l NO2− + NO3− comes from condensate absorption of flue gas NOx. Some Cu is noted, 16 mg/l, which originates from copper corrosion of the condenser tubes. After CO2-stripping, condensate filtration and a mixed bed ion exchanger, the condensate is of suitable quality for reuse as humidification water. The need for large quantities of demineralized water has by many authors been identified as a drawback for the evaporative cycle. However, by cooling the humid flue gas, the recovery of condensed water cuts the need of water feed. A self supporting water circuit can be achieved, with no need for any net addition of water to the system. In the pilot plant, this was achieved by cooling the flue gas to around 35°C.
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Platonova, N. B. "The dynamics of the content of ascorbic acid in fresh leaves of tea (Camellia sinensis (L.) Kuntze) growing in the humid subtropics of Russia." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-352.
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Noubactep, Chicgoua, Peter Volke, Broder Merkel, and Günther Meinrath. "Mitigation of Uranium in Effluents by Zero Valent Iron: The Role of Iron Corrosion Products." In ASME 2001 8th International Conference on Radioactive Waste Management and Environmental Remediation. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/icem2001-1258.
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Abstract This study was conducted to investigate the influence of iron corrosion products on the removal precipitation of uranium (VI) from aqueous solutions by zero valent iron (ZVI). Batch experiments were conducted with solutions containing 20 mg /L U(VI) (0.084 mM) at room temperature with washed and untreated scrap iron. The results show significant decrease of the immobilization efficiency of ZVI for uranium in the presence of both atmospheric corrosion products and those generated in situ. Among the relevant groundwater components, those who promote the iron corrosion e.g. SO42−, Cl− produce more corrosion products and have a stronger negative effect on the immobilization process. Carbonate ions also have a negative effect on the immobilization efficiency since they form stable complexes with uranium and reduce the adsorption on the iron surface which is the first step to immobilization. Humic substances didn’t show any negative effect but rather a slight enhancement of the immobilization rate. These results show that washing ZVI materials with hydrochloric acid before testing will overestimate their efficiency in practical use.
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Avello, A. Garcia, R. A. Fernandez Trejo, L. J. Garcia Frade, A. Pardo Vigo, J. Cesar, and J. L. Navarro. "A METHOD FOR DETERMINATION OF FUNCTIONAL α-2 ANTIPLASMIN LEVELS IN PLASMA: THE CIRCULAR LYSIS INHIBITION OF AGAROSE-FIBRIN PLATE." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644841.
Full textAbstract:
A new, simple and reliable technique .has been developed for the determination of functional α-2 Antiplasmin in plasma; It is based on the circular inhibition of lysis produced by a-2 Antiplasmin from a hole punched out in an agarose-fibrin plate in which Urokinase has been previously dissolved.Briefly: An Agarose-Fibrin plate is made with Agarose>(l%), Fibrinogen (0.5%) and Urokinase (0.5 U/ml). The components are mixed at 422 C and thrombinCO.25 U/ml is used to coagulate Fibrinogen. The mixture is poured on a horizontal glass, plate and left at room temperature. 30 min later a series of holes are punched out in the plate and the samples and controls are seeded in the holes.The plate is incubated during 18 hours at 37° C in a humid chamber. After that time, all the plate has been lysed by plasmin produced by Urokinase except a circular area around the holes where α-2 Antiplasmin has migrated from the border: A round opaque circle can be seen around the holes and the diameters are proportional in a log-log scale with the aα-2 Antiplasmin levels of the sample.A standard curve is constructed with a pool of plasmas and the diameters of each sample are referred to it in a log-log scale, determining in this way the levels of functional α-2 Antiplasmin as a percentage.The lysis inhibition circle is entirely due_ to α-2 Antiplasmin and not to any other Fibrinolysis inhibitor: This has been demonstrated incubating previosusly the samples with antibodies directed to α-2 Macroglobulin, α-1 antitrypsin and C-l Esterase Inhibitor with no change in the circle. But when samples were incubated with an antibody to α-2 Antiplasmin, the opaque lysis inhibition circle disapeared.This method presents a very good correlation with other functional methods (cromogenic substrate s-2251 Kabi:r=0.92 p(0.01) and is comparatively simpler.the sensibility of the method is 0.5 % and the reproductibility is 3% day by day and 1% in a same day.