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124 resultados encontrados para: TEMA: Nemátodos
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1.
Libro - Informe técnico
Informe técnico del proyecto investigadores PROMECAFE/ANACAFE-GUATEMALA periodo marzo 1995 - febrero 1996
Programa Cooperativo para la Protección de la Caficultura (Guatemala) ;
[Guatemala, Guatemala] : Programa Cooperativo para la Protección de la Caficultura , s.f.
Clasificación: AC/633.73 / P7
Bibliotecas: San Cristóbal , Tapachula
Cerrar
SIBE San Cristóbal
ECO010009409 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
ECO020009701 (Disponible) , ECO020004635 (Disponible)
Disponibles para prestamo: 2

2.
Artículo
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Resumen en: Inglés |
Resumen en inglés

This study was aimed at evaluating thein vitroeffect of the edible mushroom (EM) Pleurotus eryngiiagainst the eggs and larvae (L3) of Haemonchus contortus. The evaluation included acetone (AE) and hydroalcoholic (HA) extracts of the following strains: ECS-1138, ECS-1156, ECS-1255, ECS-1258, ECS-1261, ECS-1282, and ECS-1292. The HA extract of the ECS-1255 strain showed thehighest effect on mortality rates of L3 (18.83%) at 20 μg/mL. After subjecting this HA extract to a normal phase chromatography column, five fractions were obtained; fraction F5 (100% MeOH) was the most effective against eggs, with hatching inhibition percentages of 88.77 and 91.87% at 20 and 40 mg/mL, respectively. Gas chromatography-mass spectrometry (GC-MS) subjected this fraction to an acetylation reaction to determine the content of the secondary metabolites. The GC-MSanalysis showed that the F5 fraction was composed of trehalose CAS: 6138-23-4, polyols (L-iditol CAS: 488-45-9, galactitol CAS:608-66-2, D-mannitol CAS: 69-65-8, D-glucitol CAS: 50-70-4, and myoinositol CAS: 87-89-8), adipic acid CAS: 124-04-9, stearic acid CAS: 57-11-4, squalene CAS: 111-02-4, and β-sitosterol CAS: 83-46-5.


3.
Artículo
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In vitro nematocidal activity of commercial fatty acids and β-sitosterol against Haemonchus contortus
Pineda Alegría, Jesús Antonio (autor) ; Sánchez, José E. (autor) ; González Cortázar, Manáses (autor) ; Von Son de Fernex, Elke (autora) ; González Garduño, Roberto (autor) ; Mendoza de Gives, Pedro (autor) ; Zamilpa, Alejandro (autor) ; Aguilar Marcelino, Liliana (autora) ;
Contenido en: Journal of Helminthology Vol. 94, e135 (2020), p. 1-4 ISSN: 1475-2697
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Resumen en: Inglés |
Resumen en inglés

Haemonchus contortusis a haematophagous gastrointestinal nematode (GIN) that causes severe anaemia and even death in small ruminants, negatively impacting the economic viability of farms. Traditionally, this parasite has been controlled with chemical compounds; however, inadequate use of these types of products has favoured the emergence of anthelmintic resistance. Therefore, it is necessary to search for alternatives for GIN control. Previous studies have reported the anthelmintic activity of edible mushroom extracts against H. contortus. A recent study reported that a fraction constituted of different fatty acids and β-sitosterol isolated from the basidiomata of the edible mushroom Pleurotus djamor ECS-123 has ovicidal and larvicidal activity against H. contortus. Thus, this study aimed to assess the anthelmintic activity of the pure molecules: pentadecanoic acid, palmitic acid, β-sitosterol, stearic acid and linoleic acid. For this purpose, an egg-hatching inhibition test was carried out in which the compounds were evaluated individually and in combination at a final concentration of 20 mg mL−¹. Furthermore, larval mortality was assessed using a combination of the five commercial compounds previously mentioned at different concentrations (1.25–20 mg mL−¹). Palmitic acid and stearic acid, in some combinations, inhibited H. contortus egg hatching by 100%. On the other hand, in the larval mortality test, the combination of the five compounds showed dose-dependent behaviour, and 100% mortality was obtained 24 h post-incubation. Pure molecules and their combinations have anthelmintic-like activity against the eggs and larvae of H. contortus.


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5.
Tesis - Maestría
Variabilidad genética del nematodo Metaparasitylenchus hypothenemi parásito de la broca del café / Marina Simota Ruiz
Símota Ruiz, Marina (autora) ; Castillo Vera, Alfredo (director) ; Mikery Pacheco, Oscar Fernando (asesor) ; Cisneros Hernández, Juan (asesor) ;
Tapachula, Chiapas, México : El Colegio de la Frontera Sur , 2020
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
60664-10 (Disponible)
Disponibles para prestamo: 1
Resumen en español

El nematodo Metaparasitylenchus hypothenemi (Tylenchida: Allantonematidae) es un parásito de la broca del café Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae) en México y Guatemala. En esta investigación, nuestros objetivos fueron estimar la variabilidad genética de las poblaciones de M. hypothenemi, así como estimar la filogenia intra e inter-específica y determinar el potencial del gen COI para identificar al nematodo. Para ello, se colectaron adultos de la broca del café en 18 localidades de la región Soconusco, Chiapas; de los cuales, se obtuvieron los nematodos. Se utilizaron cinco hembras adultas de M. hypothenemi por cada localidad para realizar la extracción de ADN, amplificación y secuenciación del fragmento de 648 pb del gen COI. Se analizaron un total de 76 secuencias, dando como resultado 6 haplotipos, de los cuales, el haplotipo H1 fue el más frecuente y el probable ancestral. Los valores más altos de diversidad genética se registraron en las poblaciones de Salvador Urbina, La Alianza y Los Cacaos y se observó alta diferenciación genética y flujo genético restringido entre poblaciones (FST=0.66, Nm= 0.5, p<0.001). El análisis filogenético de máxima verosimilitud reveló dos linajes bien diferenciados (100 % bootstrap). Estos resultados sugieren que la variación y diferenciación genética entre poblaciones de M. hypothenemi son afectadas por el distanciamiento geográfico y probablemente con procesos adaptativos mediados por factores ambientales locales como la fragmentación del paisaje, el clima y la historia evolutiva. Además, se plantea la posibilidad de que M. hypothenemi esté constituida por dos linajes. Finalmente, se confirma la viabilidad de las secuencias del gen COI para identificar al nematodo M. hypothenemi y el potencial de esta herramienta para estudiar sus poblaciones desde una perspectiva molecular


6.
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First description of the male and subgravid female of Philometra serranellicabrillae Janiszewska, 1949 (Nematoda: Philometridae), a gonad-infecting parasite of the comber Serranus cabrilla (Linnaeus) (Serranidae) off Tunisia
Ghanmi, Nessrine (autora) ; González Solís, David (autor) ; Gargouri, Lamia (autora) ;
Contenido en: Systematic Parasitology Vol. 96, no. 8 (2019), p. 673–679 ISSN: 0165-5752
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The male and subgravid female of Philometra serranellicabrillae Janiszewska, 1949 (Philometridae) collected from the gonads of Serranus cabrilla (Linnaeus) (Serranidae) off Tunisia are described for the first time based on light and scanning electron microscopical studies. The male of this nematode can be separated from other congeneric gonad-infecting nominal species in the structure and shape of the gubernaculum (e.g. absence of a dorsal protuberance and a median smooth field). The shape ofthe male posterior region is unique in that it bears apair of big circular papillae posterior to the cloacal opening, which is also present in other Philometra spp. from serranids, i.e. P. indica Moravec & Manoharan, 2014, P. inexpectata Moravec, Chaabane, Justine & Neifar, 2016 and P. jordanoi (López-Neyra, 1951) Yamaguti, 1961. Moreover, P. serranellicabrillae differs from its congeners in other fish families from the Mediterranean Sea, in the length of spicules and gubernaculum.


7.
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The parasitic nematode Metaparasitylenchus hypothenemi interferes with the endoparasitoid Phymastichus coffea, in the biological control of the coffee berry borer
Castillo Vera, Alfredo (autor) ; Infante, Francisco (autor) ;
Contenido en: Biocontrol Science and Technology Vol. 29, no. 4 (2019), p. 388-392 ISSN: 1360-0478
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We studied the interaction of Metaparasitylenchus hypothenemi with the exotic parasitoid Phymastichus coffea, when both natural enemies, co-ocurred inside the coffee berry borer adult. The nematode affects larvae and pupae ofP. coffea, reducing by ten times the parasitoid’s adult progeny. We concluded that the negative effect caused by M. hypothenemi on the survival and development of juvenile stages of P. coffea could affect the action of this parasitoid as a natural enemy of this pest.


8.
- Artículo con arbitraje
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Sterility of the coffee berry borer, Hypothenemus hampei (Coleoptera: Curculionidae), caused by the nematode Metaparasitylenchus hypothenemi (Tylenchidae: Allantonematidae)
Castillo Vera, Alfredo (autor) ; Martínez, Félix (autor) ; Gómez Ruiz, Jaime (autor) ; Cisneros Hernández, Juan (autor) ; Vega, Fernando E. (autor) ;
Contenido en: Biocontrol Science and Technology Vol. 26, no. 8 (June 2019), p. 786-795 ISSN: 0958-3157
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Resumen en: Inglés |
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Metaparasitylenchus hypothenemi is an endoparasitic nematode that causes partial or total sterility of coffee berry borer (Hypothenemus hampei) females, although the causes are unknown. Fecundity and the average size of the common and lateral oviduct, vitellarium, and germarium in the four ovarioles (I, II, III and IV) were compared between parasitised and non-parasitised insects to determine the causes of sterility. The nematode significantly lowers the number of oocytes and 86% of parasitised insects (24 out of 28 insects) were sterile, while fecundity in the remaining 13% was non-significantly different to that in non-parasitised insects. No significant differences were recorded in the size of the common oviduct, lateral oviduct, vitellarium, and germarium between parasitised and non-parasitised insects and the nematode does not cause any apparent damage on the surface of the ovary.


9.
Artículo
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Endoparasites of Crotalus tzabcan (Serpentes: Viperidae), with a checklist in rattlesnakes
Carbajal Márquez, Rubén Alonso (autor) ; González Solís, David (autor) ; Cedeño-Vázquez, J.R. (autor) ;
Contenido en: Journal of Parasitic Diseases Vol. 42, no. 2 (June 2018), p. 303–314 ISSN: 0971-7196
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The helminth and pentastomid fauna of 50 specimens of Crotalus tzabcan from the Yucatán Peninsula, Mexico is documented. The examination revealed the presence of three nematode species (Hastospiculum onchocercum, Hexametra boddaertii, and Travassosascaris araujoi), and one pentastomid (Porocephalus crotali). The threee nematode species had the same prevalence (2%), while the pentastomid had a higher prevalence (8%). The pentastomid P. crotali was the most abundant and intense parasite, although it was only found in four snake hosts. Crotalus tzabcan acts as definitive host for the adult helminths and pentastomids, with rodents as the probable intermediate hosts. This work represents the first systematic survey on the parasitic helminth and pentastomid fauna of C. tzabcan, and includes four new geographical records. Additionally, a checklist of helminths and pentastomids reported for Crotalus and Sistrurus is provided. To date, a total of 32 helminth and 7 pentastomid species have been recorded as parasites of rattlesnakes. Nematoda possessed the highest species richness. The genera with the highest number of host species were Mesocestoides and Hexametra, followed by Kalicephalus. The rattlesnake species with the highest number of reported parasites was C. durissus (18 nematodes and 2 pentastomids).


10.
- Artículo con arbitraje
Philometra barbata n. sp. (Nematoda: Philometridae) from the red mullet Mullus barbatus (Perciformes, Mullidae) off Tunisia
Ghanmi, Nessrine ; González Solís, David (coaut.) ; Gargouri, Lamia (coaut.) ;
Contenido en: Acta Parasitologica Vol. 63, no. 4 (octubre 2018), p. 766–771 ISSN: 1230-2821
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Resumen en inglés

Helminthological examinations of the red mullet Mullus barbatus (Linnaeus) (Mullidae) from the Gulf of Hammamet, off Tunisia, revealed the presence of one undescribed gonad-infecting nematode species, Philometra barbata n. sp. (Philometridae). The new species as other congeneric species is mainly characterized by the shape of the caudal mound, the distribution of the caudal papillae and the shape of the gubernaculum with the presence of a dorsal protuberance consisting of two dorsolateral lamellar parts separated from each other by a smooth median field in the male. The new species differs from its gonadinfecting congeners in the body length of male, the length of spicules and gubernaculum. This is the second nominal species of Philometra reported from fishes of the family Mullidae and the 14th from the Mediterranean Sea.