scholarly journals Toxic Effects of Some Plant Oils and Their Common Constituents on the Psyllid Pest, Heteropsylla cubana (Homoptera:Psyllidae)of Social Forestry Tree Leucaena Leucocephala

1992 ◽  
Vol 27 (2) ◽  
pp. 285-287 ◽  
Author(s):  
Ravindra Nath SHARMA ◽  
Vrushali TARE ◽  
Pushpa PAWAR ◽  
Prakash Hari VARTAK
Keyword(s):  
Leucaena Leucocephala ◽  
Toxic Effects ◽  
Plant Oils ◽  
Social Forestry ◽  
Heteropsylla Cubana

Tamarixia leucaenae sp. n. (Hymenoptera: Eulophidae) parasitic on the leucaena psyllid Heteropsylla cubana Crawford (Hemiptera) in Trinidad

1988 ◽  
Vol 78 (3) ◽  
pp. 545-547 ◽  
Author(s):  
Z. Bouček
Keyword(s):  
Leucaena Leucocephala ◽  
Heteropsylla Cubana ◽  
Shade Tree ◽  
The Tropics

AbstractTamarixia leucaenae sp. n. is described from Trinidad as a parasitoid of Heteropsylla cubana Crawford. The psyllid is a serious pest of Leucaena leucocephala, which is used as a shade tree in plantations of various crops in the tropics.

scholarly journals Toxic effects of essential plant oils in adult Sitophilus oryzae (Linnaeus) (Coleoptera, Curculionidae)

2011 ◽  
Vol 55 (1) ◽  
pp. 116-120 ◽  
Author(s):  
Andréa Roveré Franz ◽  
Neiva Knaak ◽  
Lidia Mariana Fiuza
Keyword(s):  
Sitophilus Oryzae ◽  
Toxic Effects ◽  
Plant Oils

A new encyrtid (Hymenoptera) parasitoid of the leucaena psyllid (Homoptera: Psyllidae) from Mexico, Central America and the Caribbean

1990 ◽  
Vol 80 (1) ◽  
pp. 37-42 ◽  
Author(s):  
John S. Noyes
Keyword(s):  
Central America ◽  
Leucaena Leucocephala ◽  
Heteropsylla Cubana ◽  
Shade Tree ◽  
The Caribbean ◽  
The Tropics

Psyllaephagus yaseenisp.n. is described from Mexico, Central America and the Caribbean as a parsitoid of the nymphs of Heteropsylla cubana Crawford. The psyllid is a serious pest of Leucaena leucocephala, a shade tree and animal fodder in the tropics.

Toxicity of Leucaena leucocephala in ruminants: the effect of supplemental thyroxine on goats fed on a sole diet of Leucaena

1983 ◽  
Vol 34 (6) ◽  
pp. 791 ◽  
Author(s):  
RG Megarrity ◽  
RJ Jones
Keyword(s):  
Zinc Deficiency ◽  
Body Condition ◽  
Leucaena Leucocephala ◽  
Normal Serum ◽  
Toxic Effects ◽  
Thyroid Status ◽  
Serum Thyroxine ◽  
Serum T4 ◽  
Thyroid Hyperplasia

Daily injections of thyroxine were ineffective in overcoming the toxic effects of feeding Leucaena to goats. The treated goats did not differ from the controls in liveweight change or body condition over the 15 weeks of feeding Leucaena and both groups of animals developed oesophageal lesions. Treated animals maintained normal serum thyroxine (T4) and triiodothyronine (T3) levels and did not exhibit the thyroid hyperplasia of the controls. An increase in the serum T4 and T3 levels of three of the control animals after 5 weeks of feeding was associated with declining mimosine concentration in the feed and the ability of the hyperplastic thyroids to produce sufficient T4. Serum analyses suggested zinc deficiency in the control animals, associated with their low thyroid status. It was concluded that the goitrogenicity of 3-hydroxy-4(1H)-pyridone (DHP) is only partly responsible for the toxicity of Leucaena to ruminants, and that the low feed intakes and low liveweight gains are related to other effects of DHP. The evidence for extra-ruminal metabolism of DHP is discussed.

scholarly journals Evaluar los enemigos naturales de Leucaena Psyllid y Onion Thrips en los procesos de cosecha en diferentes genotipos de Leucaena

2017 ◽  
Vol 7 (1) ◽  
pp. 133
Author(s):  
Ahmed M. M. Ahmed ◽  
Francisco J. Solorio Sánchez ◽  
Luis Ramírez y Avilés ◽  
Al-Zyoud, F. A
Keyword(s):  
Leucaena Leucocephala ◽  
Thrips Tabaci ◽  
Onion Thrips ◽  
Heteropsylla Cubana

El estudio se llevó a cabo en 2013 y 2014, en Xmatkuil, Mérida, Yucatán, México a la encuesta enemigos naturales y sus efectos sobre la dinámica poblacional de Leucaena leucocephala (Lam.) de plagas Wit: Leucaena Psílidos, Heteropsylla cubana Crawford (1914) (Homoptera: Psyllidae) y cebolla trips, Thrips tabaci Lindeman, 1889 (Thysanoptera: Thripidae) en cuatro genotipos de Leucaena: Cunningham, K636, Nativa y KX2. Se recogieron las hojas juveniles, examinaron y cuenta del enemigo natural, se correlacionaron con cada uno de los números de plagas. Nueve depredadores relacionados con 5 órdenes, y uno parasitoide controlan las poblaciones de ambas plagas. En la primera temporada Nativa tuvo las mayores densidades de Psyllid, y Cunningham para Thrips. En la segunda temporada, Nativa para ambas plagas. Los números de menos registran en KX2 para ambas plagas. El coeficiente de correlación (r) fue más fuerte entre los enemigos naturales y H. cubana que T. tabaci. En la primera temporada se produjeron tres picos del psílido, dos antes de la primera cosecha en mayo y junio y una después en diciembre. De lo contrario, cuatro picos de trips se registraron en Cunningham, Nativa y K636 durante mayo a agosto y sólo dos ocurrieron en KX2 en mayo y junio. En la segunda temporada de la mayor población de plagas se registró en Nativa, y la más baja se encontraban en KX2 para ambas plagas (r) fue negativa entre trips y enemigos naturales. Psyllid mostró dos picos en febrero y abril, y dos para los trips en abril y junio.

Ultrastructure of the effect of T-514 obtained from Karwinskia humboldtiana on assembly and integrity of yeast's peroxisomes

1991 ◽  
Vol 49 ◽  
pp. 136-137
Author(s):  
J. Sepulveda-Saavedra ◽  
I. Vander-Klei ◽  
M. Venhuis ◽  
Y. Piñeyro-Lopez
Keyword(s):  
Culture Conditions ◽  
Toxic Effects ◽  
Candida Boidinii ◽  
Central Mexico ◽  
Poisonous Plant ◽  
Biological Behaviour ◽  
Enzyme Content ◽  
Fat Deposits ◽  
Yeast Model

Karwinskia humboldtiana is a poisonous plant that grows in semi desertic areas in north and central México. It produces several substances with different toxic effects. One of them designated T-514 damages severely the lung, kidney and liver, producing in the hepatoeyte large intracellular fat deposits and necrosis. Preliminary observations demonstrated that three is a decrease in the amount of peroxisomes in the hepatocytes of experimentally intoxicated rats and monkeys. To study the effect exerted by the T-514 on peroxisomes, a yeast model was selected, thus, three species: Saccha romices cerevisiae, Ilansenula polymorpha and Candida boidinii were used, because there is information concerning their peroxisome's morphology, enzyme content, biological behaviour under different culture conditions and biogenesis.

Some Conditions Necessary for Pinocytosis

1968 ◽  
Vol 26 ◽  
pp. 142-143
Author(s):  
M. W. Brightman
Keyword(s):  
Smooth Muscle ◽  
Cell Membrane ◽  
Toxic Effects ◽  
Cytological Evidence ◽  
Cell Processes

The cytological evidence for pinocytosis is the focal infolding of the cell membrane to form surface pits that eventually pinch off and move into the cytoplasm. This activity, which can be inhibited by oxidative and glycolytic poisons, is performed only by cell processes that are at least 300A wide. However, the interpretation of such toxic effects becomes equivocal if the membrane invaginations do not normally lead to the formation of migratory vesicles, as in some endothelia and in smooth muscle. The present study is an attempt to set forth some conditions under which pinocytosis, as distinct from the mere inclusion of material in surface invaginations, can take place.

Toxic effects of aerosol propellants on the heart

1973 ◽  
Vol 131 (1) ◽  
pp. 162-166 ◽  
Author(s):  
W. S. Harris
Keyword(s):  
Toxic Effects
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