scholarly journals In vitro biology of Columbicola bacillus (Phthiraptera: Ischnocera)

2012 ◽  
Vol 4 (2) ◽  
pp. 234-236
Author(s):  
Padam Singh ◽  
Gaurav Arya ◽  
Aftab Ahmad ◽  
A.K. Saxena
Keyword(s):  
Life Table ◽  
Intrinsic Rate ◽  
Natural Increase ◽  
Ring Dove ◽  
Vitro Biology

An ischnoceran louse, Columbicola bacillus infesting Ring dove, Streptopelia decaocto was subjected to in vitro experimentation. The data obtained through in vitro experimentation was utilized to construct the life table and to determine its intrinsic rate of natural increase (rm). The value of rm appeared to be 0.054. At this rate, the population of C. bacillus is supposed to be double after 12.95 days, indicating that it is moderate breeder.

Intrinsic rate of natural increase of Brueelia amandavae (Ischnocera, Phthiraptera) populations infesting Indian red avadavat

Biologia ◽  
2007 ◽  
Vol 62 (4) ◽  
Author(s):  
Nidhi Gupta ◽  
Sandeep Kumar ◽  
Arun Saxena
Keyword(s):  
Life Table ◽  
Doubling Time ◽  
Intrinsic Rate ◽  
Natural Increase ◽  
Adult Longevity ◽  
In Vivo Experiments ◽  
Egg Deposition

AbstractThe incubation period of eggs, duration of three nymphal instars, adult longevity and the daily egg-deposition rate of the ischnoceran Phthiraptera, Brueelia amandavae, were determined by rearing the louse in vitro (35 ± 1°C, 75–82% RH, feather diet). The data obtained were utilized for life table construction and determination of the intrinsic rate of natural increase (0.031 per day) and the doubling time (23.45 days) of the louse population. The doubling time of the louse in in vivo experiments was 21.5 days.

Intrinsic rate of natural increase of an isochnoceran louse Goniocotes jirufti (Ansari, 1947) (Phthiraptera: Insecta)

ENTOMON ◽  
2020 ◽  
Vol 45 (2) ◽  
pp. 129-134
Author(s):  
Aftab Ahmad
Keyword(s):  
Life Table ◽  
Incubation Period ◽  
Doubling Time ◽  
Intrinsic Rate ◽  
Natural Increase ◽  
The Other ◽  
Adult Longevity

The ischnoceran lice, Goniocotes jirufti (Ansari, 1947) infesting the black partridge, Francolinus francolinus were reared in vitro condition (35 ± 1°C, 75-82% RH, at feather diet), to record the incubation period, adult longevity and daily egg rate. The data obtained from in vitro experimentation were used to construct the life table and to determine the intrinsic rate of natural increase (rm). The value of rm of aforesaid species was computed as 0.042. At this rate the doubling time of its population appeared to be 16.50 days. In comparison to the other species studied so far, G. jirufti seems to breed moderately.

Life table and economic threshold concept for ecologically sustainable management of Diacrisia casignetum Kollar (Lepidoptera: Arctiidae) on Jute

ENTOMON ◽  
2019 ◽  
Vol 44 (2) ◽  
pp. 103-110
Author(s):  
Nayan Roy
Keyword(s):  
Life Table ◽  
Demographic Data ◽  
Intrinsic Rate ◽  
Natural Increase ◽  
Economic Injury Level ◽  
Economic Threshold ◽  
Potential Fecundity ◽  
Rate Of Increase ◽  
Economic Injury ◽  
Ecologically Sustainable

Life table and economic threshold (ET) level of Diacrisia casignetum Kollar on jute was calculated in West Bengal condition during 2016-2018 for environmentally benign management and better production of jute. The demographic data of D. casignetum always construct type-III survivorship curve like most of the insects. Potential fecundity (Pf) and total fertility rate (Fx) were 384.667±5.487 and 30893.60±1063.586, respectively. The average intrinsic rate of natural increase (rm) and the daily finite rate of increase (ë) were 0.106±0.001 and 1.111±0.003 respectively with the generation time (Tc) of 41.520±0.069 and doubling time (DT) of 6.563±0.021 days. Their mean population momentum factor of increase (PMF) was 19.676±0.605 including vital index (VI) and trend index (TI) of 0.522±0.003 and 92.359±2.648, respectively with different levels of significance. The economic injury level (EIL) and ET based on percent yield loss of jute were 7.119±2.166 and 6.385±1.969 pests per plant, respectively. At single pest observation per plant, the possible time taken to reach EIL (Ti) and ET (Tt) were 6.377±3.292 and 5.377±3.292 days, respectively which will be useful for better cultivation of jute and other subsequent crops.

The construction of a life-table for Glossina morsitans morsitans Westwood (Diptera: Glossinidae) from seasonal age-measurements of a wild population

1979 ◽  
Vol 69 (4) ◽  
pp. 553-560 ◽  
Author(s):  
P. Taylor
Keyword(s):  
Life Table ◽  
Wild Population ◽  
Intrinsic Rate ◽  
Glossina Morsitans Morsitans ◽  
Female Offspring ◽  
Natural Increase ◽  
Glossina Morsitans ◽  
Tsetse Population ◽  
Four Seasons ◽  
Age Structures

AbstractSamples of female Glossina morsitans morsitans Westw. were collected in the Zambesi Valley in Zimbabwe-Rhodesia using an electric net and aged using the overian ageing technique. Similar age-structures were demonstrated in the four seasons studied, and the life-table constructed on the basis of the reproductively active members of the population indicates that females produce more than two female offspring in a lifetime. The tsetse population is considered to be regulated by the survival of the newly emerged teneral flies and non-teneral nullipars. The intrinsic rate of natural increase (rm) is calculated from the life-table as 0·01204 for the reproductively active sector of the population.

Host-dependent life history and life table parameters of Tetranychus truncatus (Acari: Tetranychidae)

2017 ◽  
Vol 22 (12) ◽  
pp. 2068 ◽  
Author(s):  
Md. Tarikul Islam ◽  
Mahbuba Jahan ◽  
Tetsuo Gotoh ◽  
Mohammad Shaef Ullah
Keyword(s):  
Life Table ◽  
Host Plants ◽  
Control Strategies ◽  
Intrinsic Rate ◽  
Natural Increase ◽  
Reproduction Rate ◽  
Lablab Purpureus ◽  
Male And Female ◽  
Corchorus Capsularis ◽  
Rate Of Increase

The effects of three economically important host plants, jute (Corchorus capsularis L.), bean (Lablab purpureus L.) and papaya (Carica papaya L.), on the development, reproduction and demographic parameters of the spider mite Tetranychus truncatus Ehara (Acari: Tetranychidae) were investigated under laboratory conditions of 30 ± 1°C, 60–80% RH and a photoperiod of 16L: 8D using age-stage, two-sex life table analysis. Both male and female T. truncatus successfully completed development from egg to adult on the three host plants. The development time from egg to adult for female T. truncatus was longer on Jute than on bean and papaya. Male and female longevities were higher on jute and bean than on papaya. Fecundity of T. truncatus was higher on jute than on bean and papaya. Adult pre-oviposition period was lower on bean and the number of oviposition days were higher on jute. The net reproduction rate of T. truncatus was significantly higher on jute than on bean and papaya, whereas intrinsic rate of natural increase and the finite rate of increase were higher on bean than on the other two host plants. The mean generation time of T. truncatus was higher on jute than on bean and papaya. These results based on the intrinsic rate of natural increase indicate that jute and bean were more suitable than papaya as hosts for T. truncatus, to helping develop management and control strategies for this pest.

scholarly journals Fertility Life Tables of Plastanoxus westwoodi (Kieffer) (Hymenoptera: Bethylidae) on Cryptolestes pusillus (Schon.) (Coleoptera: Cucujidae)

1970 ◽  
Vol 16 ◽  
pp. 25-28
Author(s):  
MM Rahman ◽  
W Islam ◽  
KN Ahmed
Keyword(s):  
Life Table ◽  
Adult Emergence ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Natural Increase ◽  
Life Tables ◽  
Net Reproductive Rate ◽  
Rate Of Increase ◽  
Host Instar ◽  
Cryptolestes Pusillus

Plastanoxus westwoodi is an efficient ectoparasitoid of larvae and pupae of the red flat grain beetle Cryptolestes pusillus. Fertility life tables and effects of host instar on life table parameters of P. westwoodi on C. pusillus were studied in the laboratory. Generally adult females lived for 13-16 days. Oviposition commenced on the 1st day of adult emergence and continued till death or 1-2 days before the death of a parasitoid. The intrinsic rate of natural increase (rm) was found to be 0.2291 per female per day. The net reproductive rate (R0) was 64.07; the innate capacity for increase (rc) was 0.2096. The finite rate of increase (λ) was calculated as 1.4735 per female per day, while corrected generation time (T) was computed as 18.16 days. Key words: Plastanoxus westwoodi, Cryptolestes pusillus, Oviposition, Life table, Biological control   DOI:10.3329/jbs.v16i0.3737    J. bio-sci. 16: 25-28, 2008   

2002 Congress on In Vitro Biology

2002 ◽  
Author(s):  
John W. Harbell
Keyword(s):  
Vitro Biology

Influence of temperature on life history traits of the free-living, bacterial-feeding nematode Panagrolaimus sp. strain NFS-24

Nematology ◽  
2013 ◽  
Vol 15 (8) ◽  
pp. 939-946 ◽  
Author(s):  
Farhana Ayub ◽  
Olaf Strauch ◽  
Laurent Seychelles ◽  
Ralf-Udo Ehlers
Keyword(s):  
Intrinsic Rate ◽  
Analysis Data ◽  
Natural Increase ◽  
Population Doubling ◽  
Food Density ◽  
Hanging Drop ◽  
Free Living ◽  
Single Male ◽  
Different Temperatures ◽  
Hanging Drop Method

Life cycle analysis data of the free-living, bacterial-feeding Panagrolaimus sp. strain NFS 24-5 were assessed at different temperatures using a hanging drop method with single male and female individuals and a food density of 3 × 109 Escherichia coli cells ml−1. Lifespan at the moment when the first egg was laid was 5.7 days at 21°C and 4 days at 25, 27 and 29°C. The intrinsic rate of natural increase () was 0.53 at 21°C, 0.81 at 25°C, 0.93 at 27°C and 0.81 at 29°C, corresponding to population doubling times () of 1.3, 0.9, 0.7 and 0.9 days, respectively. Over 200 offspring per female were produced at 27°C. All other temperatures yielded fewer offspring. When females were kept without males, the life span was 49 days, whereas the last reproductive female (hanging drop with male individual) died after 16.5 days. These data will contribute to the interpretation of nematode population dynamics recorded in liquid culture.

scholarly journals Aerobic Growth of Escherichia coli Is Reduced, and ATP Synthesis Is Selectively Inhibited when Five C-terminal Residues Are Deleted from the ϵ Subunit of ATP Synthase

2015 ◽  
Vol 290 (34) ◽  
pp. 21032-21041 ◽  
Author(s):  
Naman B. Shah ◽  
Thomas M. Duncan
Keyword(s):  
Escherichia Coli ◽  
Atp Synthase ◽  
Atp Hydrolysis ◽  
Atp Synthesis ◽  
Intrinsic Rate ◽  
Synthesis Rate ◽  
Final Segment ◽  
Rotary Catalysis

F-type ATP synthases are rotary nanomotor enzymes involved in cellular energy metabolism in eukaryotes and eubacteria. The ATP synthase from Gram-positive and -negative model bacteria can be autoinhibited by the C-terminal domain of its ϵ subunit (ϵCTD), but the importance of ϵ inhibition in vivo is unclear. Functional rotation is thought to be blocked by insertion of the latter half of the ϵCTD into the central cavity of the catalytic complex (F1). In the inhibited state of the Escherichia coli enzyme, the final segment of ϵCTD is deeply buried but has few specific interactions with other subunits. This region of the ϵCTD is variable or absent in other bacteria that exhibit strong ϵ-inhibition in vitro. Here, genetically deleting the last five residues of the ϵCTD (ϵΔ5) caused a greater defect in respiratory growth than did the complete absence of the ϵCTD. Isolated membranes with ϵΔ5 generated proton-motive force by respiration as effectively as with wild-type ϵ but showed a nearly 3-fold decrease in ATP synthesis rate. In contrast, the ϵΔ5 truncation did not change the intrinsic rate of ATP hydrolysis with membranes. Further, the ϵΔ5 subunit retained high affinity for isolated F1 but reduced the maximal inhibition of F1-ATPase by ϵ from >90% to ∼20%. The results suggest that the ϵCTD has distinct regulatory interactions with F1 when rotary catalysis operates in opposite directions for the hydrolysis or synthesis of ATP.

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