Echinostoma friedi: the effect of age of adult worms on the infectivity of miracidia

2004 ◽  
Vol 78 (1) ◽  
pp. 91-93 ◽  
Author(s):  
R. Toledo ◽  
A. Espert ◽  
I. Carpena ◽  
M. Trelis ◽  
C. Muñoz-Antoli ◽  
...  
Keyword(s):  
Post Infection ◽  
Experimental Infections ◽  
Golden Hamsters ◽  
Lymnaea Peregra ◽  
Age Range ◽  
Effect Of Age

AbstractThe effect of ageing of adults ofEchinostoma friedi(Trematoda: Echinostomatidae) on the infectivity of miracidia yielded was analysed. Miracidia were obtained after hatching of eggs obtained from adult worms ofE. friedicollected weekly during the course of experimental infections in golden hamsters. Miracidial infectivity, measured in terms of percentage of infection inLymnaea peregra, was significantly influenced by the age of the adult worms from which the miracidia were derived. Infective miracidia only were obtained from adult worms in the age range from 4 to 9 weeks post-infection. Infectivity was maximal in those miracidia derived from adults collected 8 and 9 weeks post-infection. The results suggest that adult worms producing viable eggs require additional maturation to be able to yield eggs containing infective miracidia.

scholarly journals Evaluating the Risk of Tumors Diseases Based on Measurement of Urinary and Serumal Antioxidants Using the New Agar Diffusion Methods

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Ying Zhou ◽  
Jing Chen ◽  
Zhen Wang ◽  
Hui Liu
Keyword(s):  
Antioxidant Capacity ◽  
Healthy People ◽  
Healthy Individuals ◽  
Operating Characteristics ◽  
Tumor Patients ◽  
Tumor Diseases ◽  
Receiver Operating Characteristics Curve ◽  
Age Range ◽  
Urine And Serum ◽  
Effect Of Age

Objectives. To discuss the characteristics of the amount of urinary total antioxidants in tumor diseases and the possibility of utilizing the changing regulation of urinary antioxidants to diagnose tumor diseases.Method. Urine and serum specimens from 130 healthy people were used to investigate the variation of antioxidant capacity against age. Urine and serum specimens from 44 unselected patients with tumors and 44 healthy people with same age background were used to explore the significance of urinary antioxidant capacity in clinic to diagnose tumor diseases. Potassium permanganate agar method and iodine starch method were used to determine the amount of total antioxidants.Results. In healthy people, more antioxidants in urine were measured in older people, while the results were opposite in serum. More antioxidants were found in urine of tumor patients than in healthy people with same age-range.Conclusions. According to the results of 130 measurements, the amount of antioxidants in urine varies by age. By using agar methods to measure antioxidants, the effect of age is required to be considered. Antioxidants levels from tumor patients were significantly higher than healthy individuals in urine. The combination of urine and serum to determine total antioxidants can better diagnose tumor diseases based on iodine starch method, with area under the receiver operating characteristics curve at 0.787.

Efficacy of ivermectin against Parastrongylus malaysiensis infection in rats

1992 ◽  
Vol 66 (4) ◽  
pp. 293-296
Author(s):  
S. Ambu ◽  
J. W. Mak ◽  
C. S. Ng
Keyword(s):  
Post Infection ◽  
Larval Stages ◽  
Experimental Infections ◽  
Significant Pathology

ABSTRACTThe efficacy of ivermectin on experimental infections of P. malaysiensis in rats was determined. Ivermectin was 99·4% and 97·9% effective at a dosage of 400 mcg and 800 mcg respectively at seven days post-infection. The same two dosages of ivermectin when given at 14 days post infection had an efficacy of 100%. However, as an adulticide it had only 40·7% efficacy. Ivermectin may therefore be useful for the treatment of parastrongyliasis due to the larval stages of the worm which can cause significant pathology in man and animals.

THE LIFE CYCLE OF TRICHINELLA SPIRALIS: I. THE INTESTINAL PHASE OF DEVELOPMENT

1967 ◽  
Vol 45 (6) ◽  
pp. 1255-1260 ◽  
Author(s):  
C. S. Shanta ◽  
E. Meerovitch
Keyword(s):  
Life Cycle ◽  
Post Infection ◽  
Sexual Maturity ◽  
Trichinella Spiralis ◽  
Seminal Vesicles ◽  
Intestinal Phase ◽  
Experimental Infections

In experimental infections in mice, Trichinella spiralis larvae in the intestines molted twice before reaching sexual maturity. In both sexes, the first molt occurred between 12 and 16 hours post infection; in males, the second molt occurred between 24 and 32 hours, and in females, between 22 and 30 hours. The females were inseminated after the 36th hour post infection, but some males had spermatozoa in the seminal vesicles before the completion of the second molt. Structures, believed to be amphids, were observed after 2 hours post infection; they increased in size up to the 6th hour, after which they regressed and finally disappeared. The function of these amphids is believed to be related to osmoregulation.

The effect of age and gender on the time taken for horses to learn an operant task

2009 ◽  
Vol 2009 ◽  
pp. 1-1
Author(s):  
K J Moss ◽  
L Greening
Keyword(s):  
Learning Task ◽  
Learning Performance ◽  
Operant Learning ◽  
Age And Gender ◽  
Test Species ◽  
Operant Task ◽  
And Gender ◽  
The Uk ◽  
Age Range ◽  
Effect Of Age

The association between the age of a horse and their capacity for learning is understudied despite the large age range of horses used for both competition and leisure purposes in the UK and the considerable number of horses that swap over between different disciplines; for instance 4000 racehorse retire from racing each year and many go on to other careers including 900 each year going on to be polo ponies. A negative correlation between age and learning performance has been reported in test species to-date (Yagi et al., 1988); however relatively few studies have addressed this issue in equines (Madder & Price, 1980; Williams et al., 2004). The aim of the present study therefore was to investigate the association between a horse’s age and gender and the time taken to reach a pre-determined criterion during an operant learning task.

The Relationship Between Children’s Age and Disclosures of Sexual Abuse During Forensic Interviews

2016 ◽  
Vol 22 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Chelsea Leach ◽  
Martine B. Powell ◽  
Stefanie J. Sharman ◽  
Jeromy Anglim
Keyword(s):  
Sexual Abuse ◽  
Linear Quadratic ◽  
Forensic Interviews ◽  
Forensic Interview ◽  
Violent Offending ◽  
Abuse Severity ◽  
Quadratic Effects ◽  
Age Range ◽  
The Relationship ◽  
Effect Of Age

Children’s disclosures of sexual abuse during forensic interviews are fundamental to the investigation of cases. Research examining the relationship between age and disclosure has shown mixed results; the aim of the current study was to clarify and extend our knowledge by modeling linear, quadratic, and interaction effects of age on disclosure. Child sexual abuse reports made by children, their caregivers, or mandated reporters over a 12-month period to police in one state of Australia were examined. Of the 527 children (age range 3–16 years) offered a forensic interview, 81% disclosed abuse during it. The other 19% did not disclose or refused the interview. Age had both linear and quadratic effects, whereby disclosure increased with age until 11 years, after which disclosure decreased with age to 16 years. The effect of age on disclosure was moderated by five variables: abuse severity, the child–suspect relationship, suspects’ violence histories, delay of report to police, and children’s previous disclosures. Particular groups of children had lower likelihoods of disclosing abuse in forensic interviews than others, such as adolescents who alleged abuse against suspects with histories of violent offending. By identifying these groups, targeted strategies may be developed to help increase their disclosure rates.

scholarly journals RELATIVE AGE EFFECT AMONG YOUNG CROATIAN TAEKWONDO COMPETITORS

2021 ◽  
pp. 86-89
Author(s):  
Matej Babić ◽  
Dražen Čular ◽  
Igor Jelaska
Keyword(s):  
Age Effect ◽  
Chi Square ◽  
Weight Category ◽  
Relative Age ◽  
Relative Age Effect ◽  
Significant Difference ◽  
Chi Square Test ◽  
Age Range ◽  
Effect Of Age ◽  
Selection Of

Aim of this research was to identify and analyse relative age effect (RAE) on sample composed of young Croatian taekwondo competitors. In order with aim of research, for medal winners (n1=72) and other competitors (n2=187) who competed at Croatian taekwondo cadet championship 2015, date of birth, weight category and sport success were extracted. By conducting of Chi-square test on all competitors (n=259) it is proven there is non-significant difference (χ2=12.28; p=0.34) between expected and observed frequencies according to month of birth. Furthermore, significant difference between observed and expected frequencies according to year of birth of medal winners (χ2=45.31; p<0.01) is confirmed. Results of this research are pointing on presence of RAE which could lead to mistakes in selection of young athletes. Authors are suggesting to minimize allowed age range for competition, or to separate competitors in more age categories, which would enable more equal competitions and reduce effect of age on sport success.

scholarly journals Effect of Smoking on Contralateral Suppression of Distortion Product Oto Acoustic Emissions (DPOAEs)

2021 ◽  
Author(s):  
Sindhuja Nadella
Keyword(s):  
Auditory System ◽  
Acoustic Emissions ◽  
Contralateral Side ◽  
Hearing Sensitivity ◽  
Distortion Product ◽  
Contralateral Suppression ◽  
System Risk ◽  
System Functioning ◽  
Age Range ◽  
Effect Of Age

The present study compared the contralateral suppression and the amplitude of distortion product otoacoutsic emissions (DPOAEs) between smokers and non-smokers to determine the influence of smoking. Thirty smokers and thirty non-smokers within the age range of 18-40 years with a normal hearing sensitivity were considered for the study. For both the groups, DPOAEs were measured and the efferent auditory system functioning was measured by presenting the white noise of 50 dB HL to the contralateral side, while recording the DPOAEs. There was no significant effect of age on the amplitude of DPOAEs in both the groups. However, there were significant differences in the amplitude of DPOAEs between smokers and non-smokers. The amount of suppression and DPOAE amplitude were reduced in smokers when compared to non-smokers. The study found no significant correlation between the amount of smoking and amount of suppression between smokers and non-smokers. However, there were significant correlations between the amount of smoking and DPOAE at low and mid frequencies between smokers and non-smokers. Therefore, the present study highlights the increased damage to the efferent auditory system risk and the smoking ill-effects on the efferent auditory system.

scholarly journals Variation of Ethnomycological Knowledge in a Community from Central Mexico

2021 ◽  
Vol 1 (1) ◽  
pp. 6-26
Author(s):  
Eribel Bello-Cervantes Eribel Bello-Cervantes ◽  
Alexander Correa- Metrio ◽  
Adriana Montoya ◽  
Irma Trejo ◽  
Joaquín Cifuentes Blanco
Keyword(s):  
Central Mexico ◽  
Transfer Of Knowledge ◽  
Regression Analyses ◽  
Wild Mushrooms ◽  
Structured Interviews ◽  
San Pedro ◽  
The People ◽  
Ecological Importance ◽  
Age Range ◽  
Effect Of Age

We analyze the effects of the ethnomycological knowledge depending on the age range of its users and how far their homes are from the forest areas. As a study model, the traditional mycological knowledge of San Pedro Tlalcuapan SPT, in Central Mexico was used. During 2017, 135 semi-structured interviews were conducted with people of three age ranges and living in three areas of the community located at different distances from the forest. Data was analyzed using descriptive statistics and analyses of non-metric multidimensional scaling, which were then applied to calculate two indices. The effect of age and origin of the individuals on bio-cultural relevance was assessed using multiple linear regression models.Fifty species of edible wild mushrooms were registered, those mentioned most often were of the Russuladelica complex., Amanita basii and Boletus aff. edulis. Ninety-five percent of the people interviewed consumed wild mushrooms on average two times a week, while 57% collected them. Wild mushrooms are mainly recognized for their food and ecological importance. Ordination and regression analyses show that people closest to the forest, as well as older people, are able to identify more of the wild mushrooms and have greater bio-cultural mushroom awareness. Results show that there is a risk that traditional knowledge about wild mushrooms will disappear, since it is only popular in a part of the community and only at some age ranges, indicating that there is a disconnect in the transfer of knowledge.

scholarly journals Age of sign language acquisition has lifelong effect on syntactic preferences in sign language users

2020 ◽  
pp. 016502542095819
Author(s):  
Julia Krebs ◽  
Dietmar Roehm ◽  
Ronnie B. Wilbur ◽  
Evie A. Malaia
Keyword(s):  
Language Acquisition ◽  
Sign Language ◽  
Word Order ◽  
First Language ◽  
Spoken Language ◽  
Sign Languages ◽  
Simple Sentences ◽  
Age Range ◽  
Effect Of Age ◽  
Deaf Signers

Acquisition of natural language has been shown to fundamentally impact both one’s ability to use the first language and the ability to learn subsequent languages later in life. Sign languages offer a unique perspective on this issue because Deaf signers receive access to signed input at varying ages. The majority acquires sign language in (early) childhood, but some learn sign language later—a situation that is drastically different from that of spoken language acquisition. To investigate the effect of age of sign language acquisition and its potential interplay with age in signers, we examined grammatical acceptability ratings and reaction time measures in a group of Deaf signers (age range = 28–58 years) with early (0–3 years) or later (4–7 years) acquisition of sign language in childhood. Behavioral responses to grammatical word order variations (subject–object–verb [SOV] vs. object–subject–verb [OSV]) were examined in sentences that included (1) simple sentences, (2) topicalized sentences, and (3) sentences involving manual classifier constructions, uniquely characteristic of sign languages. Overall, older participants responded more slowly. Age of acquisition had subtle effects on acceptability ratings, whereby the direction of the effect depended on the specific linguistic structure.

Sign in / Sign up

Export Citation Format

Share Document