| [the effect of feeding frequency on some population parameters of rhodnius neivai]. | after changing feeding frequency to a weekly and biweekly basis, a statistical evaluation of the variation of some population and reproductive parameters was conducted. it was based on four cohorts experiments of rhodnius neivai fed on hen or rabbit. we found a direct relationship between blood feeding frequency and the parameters adult average longevity, maximum longevity and life expectancy in the animals fed on hen. on the other hand, in the insect fed biweekly on rabbit, these three values w ... | 1988 | 3078348 |
| [vital statistics of rhodnius neivai lent, 1953 (hemiptera: reduviidae) under experimental conditions]. | a statistical evaluation of the population dynamics of r. neivai is based on six cohorts experiments conducted under controlled laboratory conditions. two blood sources were offered to animals: rabbit and hen. egg hatching, nymphal development time and mortality, adult longevity and age-specific mortality, female age-specific fecundity and fertility were determined. in addition, some population parameters were evaluated, such as: life expectancy, intrinsic rate of natural increase, net reproduct ... | 1987 | 3333946 |
| rhodnius neivai: a new experimental vector of trypanosoma rangeli. | rhodnius neivai was as efficient as rhodnius prolixus and rhodnius robustus in transmitting by bite a colombian strain of trypanosoma rangeli following its inoculation into the hemocoel. under conditions of the study the strain of t. rangeli had a high and constant infectivity to the salivary glands of r. prolixus, its natural vector in colombia. six species of triatoma and dipetalogaster maximus likewise inoculated did not develop metatrypomastigotes in the salivary glands. of the 12 known spec ... | 1986 | 3518505 |
| effects of environmental temperature on life tables of rhodnius neivai lent, 1953 (hemiptera: reduviidae) under experimental conditions. | changes in life tables of rhodnius neivai due to variations of environmental temperature were studied, based on nine cohorts. three cohorts were kept at 22 degrees c, three at 27 degrees c and three at 32 degrees c. cohorts were censused daily during nymphal instars and weekly in adults. nine complete horizontal life tables were built. a high negative correlation between temperature and age at first laying was registered (r=-0,84). age at maximum reproduction was significantly lower at 32 degree ... | 1999 | 10464422 |
| phylogeny and molecular taxonomy of the rhodniini derived from mitochondrial and nuclear dna sequences. | eleven species of rhodnius and one of psammolestes were compared by dna sequence analysis of fragments of the mitochondrial large subunit ribosomal rna (mtlsurrna), the mitochondrial cytochrome b (mtcytb), and the d2 variable region of the 28s nuclear rna (d2), totaling 1,429 base pairs. the inferred phylogeny, using triatoma infestans as an outgroup, revealed two main clades within the rhodniini--one, including the prolixus group of species (rhodnius prolixus, rhodnius robustus, rhodnius neglec ... | 2000 | 11220761 |
| resistance to starvation of rhodnius neivai lent, 1953 (hemiptera: reduviidae: triatominae) under experimental conditions. | the period of resistance to starvation and the loss of weight until death of rhodnius neivai in all stages of development were studied. work was based on experiments conducted under controlled laboratory conditions. one hundred specimens of each nymphal instar were observed: 50 were fed on chicken and 50 on rabbit. adult females and males were kept together and fed on each host. all bugs were weighed weekly until death. laid eggs were collected weekly and observed during five weeks to obtain hat ... | 2001 | 11391435 |
| vital statistics of triatominae (hemiptera: reduviidae) under laboratory conditions: iii. rhodnius neglectus. | five cohorts of 100 eggs of rhodnius neglectus lent 1954 (hemiptera reduviidae) were reared simultaneously in the laboratory under constant conditions (26 +/- 1 degrees c and 60 +/- 10% rh), with mortality and fecundity data recorded weekly. we calculated stage-specific developmental times, age-specific mortality and fecundity, stage-specific and total preadult mortality, and the intrinsic rate of natural increase (r0 = 0.21), the finite population growth rate (h = 1.23), the net reproductive ra ... | 2011 | 21845936 |
| esterase patterns in species of the triatome bug rhodnius. | the aim of the present study was to analyse esterase patterns in three triatomine species of rhodnius genus. four loci, est 1, est 2, est 3 and est 4, were found. the corresponding enzymes were characterized as carboxylesterases (e.c. 3.1.1.1) or cholinesterases (e.c. 3.1.1.8) based on inhibitory experiments, using eserine sulphate, malathion, mercury chloride, p-chloromercuribenzoate (pcmb) and iodoacetamide. low genetic variability was observed: est 1, est 2 and est 3 were monomorphic in rhodn ... | 2010 | 20377728 |