Dose Response of the Cowpea Curculio (Coleoptera: Curculionidae) From Different Regions of Georgia to Some Currently Used Pyrethroid Insecticides

1990 ◽  
Vol 25 (2) ◽  
pp. 219-222 ◽  
Author(s):  
K F. N'Guessan ◽  
R. B. Chalfant
Keyword(s):  
Dose Response ◽  
Preliminary Test ◽  
Probit Analysis ◽  
Base Line ◽  
Pyrethroid Insecticides ◽  
Base Line Data

Adults of the cowpea curculio, Chalcodermus aeneus Boheman, obtained from infested peas in Attapulgus (SW), Midville (Central) and Tifton (So. Central), GA; were treated topically in the laboratory, with es-fenvalerate, cyfluthrin, cypermethrin and permethrin in 1988 to establish base-line data for the documentation of potential insecticidal resistance. A preliminary test was conducted in 1987, using permethrin, es-fenvalerate, cypermethrin, cyfluthrin and cyhalothrin on insects from Tifton. The log dose probit analysis indicated that in 1987 cyhalothrin was the most toxic of the materials tested. The 1988 test showed that es-fenvalerate was less toxic than the others and was also less toxic in Tifton, where pyrethroid insecticides have been used more extensively, than in Midville and Attapulgus.

Mechanisms of histamine-induced contraction of canine airway smooth muscle

1983 ◽  
Vol 55 (1) ◽  
pp. 22-26 ◽  
Author(s):  
S. Shore ◽  
C. G. Irvin ◽  
T. Shenkier ◽  
J. G. Martin
Keyword(s):  
Smooth Muscle ◽  
Dose Response ◽  
Response Curve ◽  
Line Tension ◽  
Isometric Tension ◽  
Dose Response Curve ◽  
Base Line ◽  
Histamine Concentration ◽  
Release Of Acetylcholine

We studied the effects of atropine (10(-10) to 10(-6) M), tetrodotoxin (TTX) (10(-6) g/ml), and neostigmine (10(-7) M) on the histamine dose-response curve of canine tracheal smooth muscle (TSM) in vitro. Pretreatment with atropine or TTX reduced base-line tension in some TSM samples, whereas neostigmine invariably caused contraction of TSM. All concentrations of atropine reduced the maximum isometric tension produced by histamine (Tmax). With 10(-6), 10(-8), and 10(-10) M atropine, Tmax was 57, 74, and 88%, respectively, of its value in paired control samples. Atropine, 10(-9) to 10(-6) M, increased the concentration of histamine which produced 20% of Tmax, whereas 10(-6) M also increased the concentration required to produce 50% of Tmax. TTX reduced tension produced by low concentrations of histamine but had no effect at higher concentrations. Neostigmine shifted the histamine dose-response curve and caused greater tension for any given histamine concentration; Tmax increased by 30% (P less than 0.05). Our data are consistent with spontaneous release of acetylcholine from cholinergic nerves in the airway tissue and suggest that histamine either accelerates this release or interacts supra-additively with the acetylcholine at the smooth muscle.

Carcase composition and the use of sample joints in the indigenous Malawi goat

1994 ◽  
Vol 1994 ◽  
pp. 210-210
Author(s):  
J A Kirk ◽  
R A Cooper ◽  
L Kamwanja
Keyword(s):  
Regression Analysis ◽  
Management Strategies ◽  
Growth Curves ◽  
Base Line ◽  
Maize Stover ◽  
Breeding Programmes ◽  
Few Data ◽  
Base Line Data ◽  
Adequate Data ◽  
Blue Gum

Few data are available on the growth and carcase characteristics of the indigenous Malawi goat, despite the fact that goats provide 20% of the meat consumed in Malawi. Better husbandry and breeding programmes can only be developed and implemented when adequate data on the performance and potential of populations have been collected. This trial was undertaken to provide base line data, in order to allow comparisons to be drawn when alternative management strategies are adopted.Does were housed in a blue-gum-pole khola, roofed with galvanised iron, in pens measuring 4m2. Each pen held 10-14 does. Feeding was based upon the grazing of indigenous pastures but the goats also had access to maize stover during the dry season. Kids were weighed at birth and fortnightly thereafter. Castrate kids, in groups of S, were slaughtered at birth and at intervals of 5kg between Skg and 25kg. Following slaughter, carcases were split down the backbone, weighed, packed into individual polythene bass and stored at -20°C to await dissection. In March 1990 right hand sides were thawed, weighed and cut into six primal joints. To reduce any errors caused by abattoir procedures the axis vertebra was removed from all carcases and discarded. Each joint was then subjected to a full dissection, using butchers’ knives, into lean, bone and fat components and the weight of each component recorded. The data generated from these dissections were used to develop aliometric growth curves for each joint and for each tissue, using multiple regression analysis.

PRODOS: Probit Analysis of Several Qualitative Dose-Response Curves

1987 ◽  
Vol 41 (1) ◽  
pp. 79 ◽  
Author(s):  
Peter Ihm ◽  
Hans-Georg Muller ◽  
Thomas Schmitt
Keyword(s):  
Dose Response ◽  
Probit Analysis ◽  
Response Curves ◽  
Dose Response Curves
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