On the Life History, Growth and Development from the Metacercarial Stage to Adulthood, of Clinostomum tilapiae Ukoli, 1966

1966 ◽  
Vol 40 (1-2) ◽  
pp. 215-226 ◽  
Author(s):  
F. M. A. Ukoli
Keyword(s):  
Life History ◽  
Body Length ◽  
Experimental Infection ◽  
Growth And Development ◽  
Anterior Testis ◽  
The Other ◽  
Mature Adults ◽  
Duration Of Infection ◽  
Young Cattle

The experimental infection of young cattle egrets with metacercarial cysts of Clinostomum tilapiae Ukoli, 1966 from Tilapia spp. is described.A table showing the duration of infection, the number of parasites recovered, the percentage of infection and the location of the parasites within the host is constructed and the results discussed.A graph of mean length and breadth of body, oral and ventral suckers, cirrus pouch, ovary and anterior testis, is plotted against the duration of infection in days. Most of these dimensions are found to attain a peak two days after infection. It is also found that while the ovary increases in size with age, the cirrus pouch remains constant, so that in mature adults, both are about equal in size,It is shown, by plotting length of organs against length of body and by expressing mean measurements of certain dimensions as percentages of body length, that apart from the testes, all the other organs in both the metacercariae and the adults maintain a constant relationship both with one another and with body length as they grow older.

Influence of fodder protein supplement on the growth and development of young cattle

2019 ◽  
Vol 1 (79) ◽  
pp. 176-182
Author(s):  
Vyacheslav Karatunov ◽  
◽  
Ivan Tuzov ◽  
Alexander Chernyshkov ◽  
Inna Zasemchuk ◽  
...  
Keyword(s):  
Growth And Development ◽  
Protein Supplement ◽  
Young Cattle

scholarly journals A Screen for Genes That Function in Abscisic Acid Signaling in Arabidopsis thaliana

Genetics ◽  
2002 ◽  
Vol 161 (3) ◽  
pp. 1247-1255 ◽  
Author(s):  
Eiji Nambara ◽  
Masaharu Suzuki ◽  
Suzanne Abrams ◽  
Donald R McCarty ◽  
Yuji Kamiya ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Growth And Development ◽  
Plant Hormone ◽  
The Other ◽  
Aba Signaling ◽  
Wild Type ◽  
Plant Growth And Development ◽  
Diverse Range ◽  
Abscisic Acid Signaling ◽  
Aba Insensitive

Abstract The plant hormone abscisic acid (ABA) controls many aspects of plant growth and development under a diverse range of environmental conditions. To identify genes functioning in ABA signaling, we have carried out a screen for mutants that takes advantage of the ability of wild-type Arabidopsis seeds to respond to (−)-(R)-ABA, an enantiomer of the natural (+)-(S)-ABA. The premise of the screen was to identify mutations that preferentially alter their germination response in the presence of one stereoisomer vs. the other. Twenty-six mutants were identified and genetic analysis on 23 lines defines two new loci, designated CHOTTO1 and CHOTTO2, and a collection of new mutant alleles of the ABA-insensitive genes, ABI3, ABI4, and ABI5. The abi5 alleles are less sensitive to (+)-ABA than to (−)-ABA. In contrast, the abi3 alleles exhibit a variety of differences in response to the ABA isomers. Genetic and molecular analysis of these alleles suggests that the ABI3 transcription factor may perceive multiple ABA signals.

The influence of dietary carbohydrates on experimental infection withTrichuris suisin pigs

Parasitology ◽  
2005 ◽  
Vol 132 (6) ◽  
pp. 857-865 ◽  
Author(s):  
L. E. THOMSEN ◽  
S. PETKEVIČIUS ◽  
K. E. BACH KNUDSEN ◽  
A. ROEPSTORFF
Keyword(s):  
Sugar Beet ◽  
Experimental Infection ◽  
Diet Group ◽  
The Other ◽  
Post Inoculation ◽  
Dietary Carbohydrates ◽  
Barley Flour ◽  
Faecal Egg Counts ◽  
The Difference ◽  
Fermentable Carbohydrates

Two experiments (Exps 1 and 2) were carried out to study the effect of dietary carbohydrates on the establishment ofTrichuris suisin pigs. Two experimental diets based on barley flour were used; Diet 1 was supplemented with non-fermentable carbohydrates from oat hull meal, while Diet 2 was supplemented with fermentable carbohydrates from sugar beet fibre and inulin. In Exp. 1, thirty-two pigs were allocated randomly into 4 groups. Two groups were fed Diet 1 and 2 groups were fed Diet 2. Pigs from one of each diet group were inoculated with 2000 infectiveT. suiseggs each and the other two groups were uninfected controls. All pigs were slaughtered 8 weeks post-inoculation (p.i.). In Exp. 2, twenty-four pigs were allocated randomly into 2 groups and fed Diet 1 or Diet 2, respectively. All the pigs were inoculated with 2000 infectiveT. suiseggs. Six pigs from each group were slaughtered 8 weeks p.i. and the remaining 6 pigs from each group were slaughtered 12 weeks p.i. Infections were followed by faecal egg counts and worm burdens were assessed at necropsy. Pigs fed Diet 2 had lower egg counts in both experiments; in Exp. 2 the difference was significant (P<0·05). No differences were found in worm burdens 8 weeks p.i. in both experiments, however, worms from pigs on Diet 2 were significantly shorter (P<0·0001). Pigs fed Diet 2 and slaughtered 12 weeks p.i. had significantly lower worm counts (P<0·01) compared to pigs fed Diet 1. The results indicate that fermentable carbohydrates do not affect the establishment ofT. suisin naïve pigs, but result in earlier expulsion and reduced growth of the established worms. Thus, diets with highly fermentable carbohydrates may be used in the control ofT. suis.

A field study of competition and interaction between Lemna minor and Lemna trisulca

1989 ◽  
Vol 67 (10) ◽  
pp. 2904-2911 ◽  
Author(s):  
Alexander L. McIlraith ◽  
Gordon G. C. Robinson ◽  
Jennifer M. Shay
Keyword(s):  
Life History ◽  
Field Study ◽  
Key Words ◽  
Field Experiments ◽  
Lemna Minor ◽  
Survey Methods ◽  
The Other ◽  
Transplant Experiment ◽  
Replacement Series ◽  
Vegetative Biomass

Field experiments and survey methods were used to assess competition and interaction between Lemna minor L. and Lemna trisulca L. at Delta Marsh, Manitoba. Sites were dominated by one or the other species or codominated by both. Replacement series experiments predicted codominance of L. minor and L. trisulca in an unshaded eutrophic site but predicted L. minor dominance when run for a longer time. Similar experiments conducted in a shaded eutrophic site predicted L. minor dominance. Addition series experiments showed that intraspecific and interspecific competition occurred in the unshaded site. In a eutrophic unshaded ditch, high densities of L. minor suppressed L. trisulca. In a eutrophic shaded site, high densities of L. minor and green algae inhibited L. trisulca, and in a sunny, less eutrophic site high density of each species inhibited the other. In a transplant experiment, L. minor biomass in shaded enclosures approached that found naturally in two shaded sites. Lemna trisulca persisted when shaded. Vegetative biomass trends in an unshaded eutrophic marsh ditch indicated spring and fall L. trisulca dominance and summer L. minor dominance. Shaded eutrophic sites were dominated by L. minor, whereas a less eutrophic site was dominated by L. trisulca. A model is developed to explain dominance patterns, and seasonal life-history responses are considered. Key words: Lemna, duckweed, competition, interaction, resources, light, nutrients.

Genetic and biological characterization of Newcastle disease viruses circulating in Bangladesh during 2010–2017: further genetic diversification of class II genotype XIII in Southcentral Asia

2021 ◽  
Author(s):  
Mohammed Nooruzzaman ◽  
Tanjin Tamanna Mumu ◽  
Congriev Kumar Kabiraj ◽  
Azmary Hasnat ◽  
Md Mijanur Rahman ◽  
...  
Keyword(s):  
Experimental Infection ◽  
Newcastle Disease ◽  
Class Ii ◽  
The Other ◽  
Lymphoid Tissues ◽  
Complete Fusion ◽  
F Gene ◽  
Nucleotide Distance ◽  
Gene Coding ◽  
Gene Data

Newcastle disease virus (NDV) is endemic in Bangladesh and is a major threat to commercial poultry operations. While complete fusion (F) genes are recommended for molecular characterization and classification of NDV isolates, heretofore, only partial F gene data have been available for Bangladeshi NDVs. To this end, we obtained the full-length F gene coding sequences of 11 representative NDVs isolated in Bangladesh between 2010 and 2017. In addition, one of the viruses (MK934289/chicken/Bangladesh/C161/2010) was used in an experimental infection of chickens to establish the viral pathotype and study gross and microscopic lesions. Phylogenetic analysis provided evidence that all studied Bangladeshi isolates belong to genotype XIII.2 of class II NDVs. Six of the viruses were isolated between 2010 and 2017 and grouped together with isolates from neighbouring India during 2013–2016. Another four Bangladeshi isolates (2010–2016) formed a separate monophyletic branch within XIII.2 and showed high nucleotide distance from the isolates from India and the other six Bangladeshi viruses within the sub-genotype; however, none of these groups fulfils all classification criteria to be named as a separate sub-genotype. The eleventh Bangladeshi virus studied here (C162) was genetically more distant from the remaining isolates. It out-grouped the viruses from sub-genotypes XIII.2.1 and XIII.2.2 and showed more than 9.5 % nucleotide distance from all genotype XIII sub-genotypes. This isolate may represent an NDV variant that is evolving independently from the other viruses in the region. The experimental infection in chickens revealed that the tested isolate (C161) is a velogenic viscerotropic virus. Massive haemorrhages, congestion and necrosis in different visceral organs, and lymphoid depletion in lymphoid tissues, typical for infection with velogenic NDV, were observed. Our findings demonstrate the endemic circulation of sub-genotype XIII.2 in Southcentral Asia and further genetic diversification of these viruses in Bangladesh and neighbouring India. This constant evolution of the viruses may lead to the establishment of new genetic groups in the region. Additional historical and prospective virus and surveillance data from the region and neighbouring countries will allow a more detailed epidemiological inference.

Concept of vayu in ayurved and yogshastra – a comparative study

2019 ◽  
Vol 7 (07) ◽  
Author(s):  
Dr sunila h deo
Keyword(s):  
Comparative Study ◽  
Growth And Development ◽  
Human Life ◽  
Holistic Approach ◽  
The Other ◽  
Eligibility Criteria ◽  
Current Effort ◽  
Important Place ◽  
Body Of Knowledge ◽  
Goals And Objectives

Introduction and Background: Yogashastra and Ayurveda are two ancient Indian sciences that have evolved separately over millennia. Many masters have contributed to the growth and development of these sciences and they have produced seminal literature and body of knowledge in both these streams. The goals and objectives of these two sciences differ from each other and accordingly their approaches too differ from each other.  Both in Yogashastra and Ayurveda, the concept of Vayu has very important place. Current effort is undertaken from the viewpoint to unravel the complementary and contradictory aspects and explore the possibility of combining the concepts so as to evolve the holistic approach. Aim: To compare the concept of Vayu as described in Yogashastra and in Ayurveda. Discussion and Results: Yogashstra the concept of Vayus is aimed solely at attaining mastery over the bodily Vayus by following Yogic disciplines to attain Moksha or final emancipation of the soul from the unending cycle of birth and death. This puts the Yogic discussion of Vayus in the realm of highest spiritual practices with the ultimate conceivable goal of human life that can be taught only by the accomplished masters and eligible seekers who fulfil the strictest eligibility criteria stipulated by Yogic discipline. On the other hand in Ayurveda the concept of Vayus is from the perspective of knowing physiology and causes of various diseases and their treatment by means of various therapies and medicines. All these things are essentially corporeal in nature and do have worldly goals to achieve.

scholarly journals On Apogamy and the development of Sporangia upon fern prothalli

1898 ◽  
Vol 63 (389-400) ◽  
pp. 56-61
Keyword(s):  
Life History ◽  
Point Of View ◽  
The Other ◽  
Normal Life ◽  
Other Hand ◽  
General Importance ◽  
Two Generations ◽  
History Of ◽  
Alternation Of Generations

The two most important deviations from the normal life-history of ferns, apogamy and apospory, are of interest in themselves, but acquire a more general importance from the possibility that their study may throw light on the nature of alternation of generations in archegoniate plants. They have been considered from this point of view Pringsheim, and by those who, following him, regard the two generations as homologous with one another in the sense that the sporophyte arose by the gradual modification of individuals originally resemblin the sexual plant. Celakovsky and Bower, on the other hand, maintaint the view tha t the sporophyte, as an interpolated stage in the life-history arising by elaboration of the zygote, a few thallophytes.

scholarly journals Effect of NaCl on seed germination in some Centaurium Hill. Species (Gentianaceae)

2007 ◽  
Vol 59 (3) ◽  
pp. 227-231 ◽  
Author(s):  
S. Zivkovic ◽  
M. Devic ◽  
B. Filipovic ◽  
Z. Giba ◽  
D. Grubisic
Keyword(s):  
Life History ◽  
Salt Tolerance ◽  
Seed Germination ◽  
Gibberellic Acid ◽  
White Light ◽  
The Other ◽  
Distilled Water ◽  
Nacl Concentration ◽  
History Of ◽  
Species Specific

The influence of high NaCl concentrations on seed germination in both light and darkness was examined in the species Centaurium pulchellum, C. erythraea, C. littorale, C. spicatum, and C. tenuiflorum. Salt tolerance was found to depend on the life history of the seeds. To be specific, seeds of all five species failed to complete germination when exposed to continuous white light if kept all the time in the presence of 100-200 mM and greater NaCl concentrations. However, when after two weeks NaCl was rinsed from the seeds and the seeds were left in distilled water under white light for an additional two weeks, all species completed germination to a certain extent. The percent of germination not only depended on NaCl concentration in the prior medium, but was also species specific. Thus, seeds of C. pulchellum, C. erythraea, and C. littorale completed germination well almost irrespective of the salt concentration previously experienced. On the other hand, seeds of C. tenuiflorum completed germination poorly if NaCl concentrations in the prior media were greater than 200 mM. When seeds after washing were transferred to darkness for an additional 14 days, they failed to complete germination if previously imbibed on media containing NaCl concentrations greater than 400 mM. However, the seeds of all species, even if previously imbibed at 800 mM NaCl, could be induced to complete germination in darkness by 1 mM gibberellic acid. .

scholarly journals Effects of herbicides on growth and number of actinomycetes in soil and in vitro

2016 ◽  
Vol 31 (3-4) ◽  
pp. 121-128 ◽  
Author(s):  
Ljiljana Santric ◽  
Ljiljana Radivojevic ◽  
Jelena Gajic-Umiljendic ◽  
Marija Saric-Krsmanovic ◽  
Rada Djurovic-Pejcev
Keyword(s):  
Growth And Development ◽  
Application Rate ◽  
Significant Inhibition ◽  
The Other ◽  
Transient Effects ◽  
Herbicide Application ◽  
Laboratory Conditions

This study was conducted under laboratory conditions to investigate the effects of herbicides (nicosulfuron, metribuzin and glyphosate) on the number of actinomycetes in soil and growth of several isolates of actinomycetes in vitro. The lowest tested concentrations equalled the recommended rates (1X), while the other three were five-fold (5X), ten-fold (10X) and fifty-fold (50X). Samples were collected for analysis 3, 7, 14, 30 and 45 days after herbicide application. Treatment with the two highest concentrations of herbicides (10X and 50X) caused a significant inhibition of the number of actinomycetes in soil and growth of the isolates in vitro. The obtained data indicated that the effect depended on the type of herbicide, application rate, duration of activity and actinomycetes isolate. The study suggests that herbicide applications in soil caused transient effects on the growth and development on actinomycetes community in soil.

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