Ecological characteristics of the eucalypt-defoliating chrysomelid Paropsis atomaria Ol.

1966 ◽  
Vol 14 (4) ◽  
pp. 647 ◽  
Author(s):  
PB Carne
Keyword(s):  
Negative Binomial ◽  
Day Length ◽  
Reproductive Capacity ◽  
Intrinsic Properties ◽  
Host Preferences ◽  
Rate Of Growth ◽  
Host Trees ◽  
Final Weight ◽  
Two Generations ◽  
Made In

This paper reports part of a study of the llfe system of Paropsis atomaria Ol., and deals with the intrinsic properties of the species, e.g. its behaviour, host preferences, reproductive capacity, rate of growth, diapause phenomena, and distribution. The studies reported were made in plantations of eucalypts in the Australian Capital Territory where two generations of the insect are completed annually. Adults which emerge in autumn were found to enter a form of reproductive diapause in response to shortening day-length, and to hibernate in the litter and soil beneath their host trees. In spring and summer, eggs are laid in batches on young shoots, their distribution conforming to that of a negative binomial. The larvae are highly gregarious in all four instars. Their rate of growth and their final weight are influenced, respectively, by temperature and by intrinsic qualities of the foliage upon which they feed. Pupation occurs in the soil beneath the trees. The fecundity of adult females was found to be a function of their size, this in turn being determined by the level of larval nutrition. The average female can mature more than 600 eggs. Although the adults appear competent to fly for considerable distances, the females tend to oviposit on the first suitable tree they encounter following emergence from the soil or litter.

Effects of Season on Parthenocarpic and Fertilized Summer Squash (Cucumis pepo L.)

1974 ◽  
Vol 10 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Irena Rylski
Keyword(s):  
Day Length ◽  
Night Temperature ◽  
Seasonal Differences ◽  
Rate Of Growth ◽  
Summer Squash ◽  
Final Weight

SUMMARYThe effect was investigated of seasonal differences between winter and spring on the development of parthenocarpic and fertilized fruits in two squash cultivars, Zucchini Elite F1 and Bushy White. The former had stronger parthenocarpic characteristics than the latter. The effect of night temperature on growth of the parthenocarpic fruits was most pronounced, both rate of growth and final weight increasing with decreasing temperature. Whereas long days inhibited development of parthenocarpic fruits, the heaviest and longest fruits were obtained under normal day-length conditions.

scholarly journals Vienan naisia tutkimassa – rajan ja perinteen jäljillä

Elore ◽  
2005 ◽  
Vol 12 (2) ◽  
Author(s):  
Katja Hyry
Keyword(s):  
Ethical Dilemmas ◽  
Two Generations ◽  
Made In

The article is based on the fieldwork made in Kemi (Finland) and Kiestinki (Dvina Karelia) in 1989. The topic of the research is the biographic tradition of the Karelian refugees. The article opens the experiences of the fieldwork, the experiences of two generations in the fieldwork together, and the ethical dilemmas which arose during the fieldwork. One topic of the article is the problem related to the cult of the rune singers which had a strong effect on the informants as well as on the fieldwork.

scholarly journals Equivalent reliability polynomials modeling EAS and their geometries

2015 ◽  
Vol 53 (1) ◽  
pp. 177-195 ◽  
Author(s):  
Zahir Abdul Haddi Hassan ◽  
Constantin Udriște
Keyword(s):  
Graph Theory ◽  
Reliability Analysis ◽  
Geometric Modeling ◽  
Intrinsic Properties ◽  
Matlab Software ◽  
Reliability Models ◽  
Algebraic Hypersurfaces ◽  
Theory Technique ◽  
Made In

AbstractIn this paper we shall introduce two equivalent techniques in order to evaluate reliability analysis of electrical aircrafts systems (EAS): (i) graph theory technique, and (ii) simplifying diffeomorphism technique. Geometric modeling of reliability models is based on algebraic hypersurfaces, whose intrinsic properties are able to select those models which are relevant for applications. The basic idea is to cover the reliability hypersurfaces by exponentially decay curves. Most of the calculations made in this paper have used Maple and Matlab software.

scholarly journals Studies on enzyme action. V.—Hydrolysis of isomeric glucosides and galactosides by acids and enzymes.

1905 ◽  
Vol 74 (497-506) ◽  
pp. 188-194 ◽  
Author(s):  
Edward Frankland Armstrong ◽  
Henry Edward Armstrong
Keyword(s):  
Relative Stability ◽  
Intrinsic Properties ◽  
Enzyme Action ◽  
Test Materials ◽  
Hydrolysis Of ◽  
Made In

In view of the use constantly made, in contrasting the action of sucroclastic enzymes, of the stereoisomeric α- and β-methyl glucosides and the corresponding galactosides as test materials, it was desirable to gain some idea of the relative stability of these four compounds in presence of acids and wherever possible towards enzymes, a know­ledge of their behaviour being of importance, both as throwing light on their intrinsic properties and for the purpose of correlating the activities of the various compounds amenable to hydrolysis.

Selection for resistance to Colletotrichum trifolii in the lucerne cultivars Hunter River and Siro Peruvian

1980 ◽  
Vol 20 (105) ◽  
pp. 447 ◽  
Author(s):  
JAG Irwin ◽  
DL Lloyd ◽  
RA Bray ◽  
PW Langdon
Keyword(s):  
Dry Matter ◽  
Plant Mortality ◽  
River Population ◽  
Colletotrichum Trifolii ◽  
F2 Population ◽  
Two Generations ◽  
Second Year ◽  
Selection For ◽  
Glasshouse Screening ◽  
Made In

Seedlings of lucerne (Medicago sativa) with increased resistance to anthracnose caused by Colletotrichum trifolii, were obtained from cvv. Hunter River and Siro Peruvian by selection through two generations under laboratory conditions. Glasshouse screening of half sib F1 and F2 families confirmed that rapid progress was made in increasing the level of resistance in both populations. In the field, after two years, F1 derivatives had lower percentages of plant mortality and disease indices than their parent cultivars, and F2 derivatives had lower values than their F1 parents. The F2 population of Siro Peruvian, in the second year, yielded 55% and 45% more dry matter than the unselected populations of Siro Peruvian and Hunter River respectively. However, the level of resistance in the field of the Siro Peruvian F2 population was only the equivalent of the unselected Hunter River population, and was inferior to the F1 and F2 populations of Hunter River.

scholarly journals Bayesian geostatistical modelling for mapping schistosomiasis transmission

Parasitology ◽  
2009 ◽  
Vol 136 (13) ◽  
pp. 1695-1705 ◽  
Author(s):  
P. VOUNATSOU ◽  
G. RASO ◽  
M. TANNER ◽  
E. K. N'GORAN ◽  
J. UTZINGER
Keyword(s):  
Negative Binomial ◽  
Infection Intensity ◽  
Spatial Process ◽  
Economic Data ◽  
Excess Zeros ◽  
Risk Profiling ◽  
Morbidity Control ◽  
The Mean ◽  
Binomial Models ◽  
Made In

SUMMARYProgress has been made in mapping and predicting the risk of schistosomiasis using Bayesian geostatistical inference. Applications primarily focused on risk profiling of prevalence rather than infection intensity, although the latter is particularly important for morbidity control. In this review, the underlying assumptions used in a study mapping Schistosoma mansoni infection intensity in East Africa are examined. We argue that the assumption of stationarity needs to be relaxed, and that the negative binomial assumption might result in misleading inference because of a high number of excess zeros (individuals without an infection). We developed a Bayesian geostatistical zero-inflated (ZI) regression model that assumes a non-stationary spatial process. Our model is validated with a high-quality georeferenced database from western Côte d'Ivoire, consisting of demographic, environmental, parasitological and socio-economic data. Nearly 40% of the 3818 participating schoolchildren were infected with S. mansoni, and the mean egg count among infected children was 162 eggs per gram of stool (EPG), ranging between 24 and 6768 EPG. Compared to a negative binomial and ZI Poisson and negative binomial models, the Bayesian non-stationary ZI negative binomial model showed a better fit to the data. We conclude that geostatistical ZI models produce more accurate maps of helminth infection intensity than the spatial negative binomial ones.

Oviposition preferences and egg survival in Nanophyes shoreae (Coleoptera, Apionidae), a weevil fruit-predator in South-east Asian rain forest

1992 ◽  
Vol 8 (2) ◽  
pp. 195-203 ◽  
Author(s):  
Robin J Toy ◽  
Sandra J Toy
Keyword(s):  
Rain Forest ◽  
East Asian ◽  
Fruit Size ◽  
Egg Survival ◽  
Oviposition Preferences ◽  
Host Trees ◽  
Chemical Stimuli ◽  
Made In

ABSTRACTNanophyes shoreae (Coleoptera, Apionidae) is a pre-dispersal fruit-predator of dipterocarp trees in South east Asian rain forest These trees frequently abort a large part of their fruitcrop soon after anthesis, coincident with N shoreae oviposition Fruit parameters, related to the incidence of weevil attack, were investigated by examination of fruit collected from host trees and through observations made in the canopy Fruit size and the incidence of prior oviposition determined whether beetles initiated attacks However, many fruits were attacked without oviposition occurring and this is discussed with respect to chemical stimuli

Water Relations of Beans I. Effects of Water Stress on Growth and Flowering

1969 ◽  
Vol 5 (3) ◽  
pp. 195-207 ◽  
Author(s):  
A. H. El Nadi
Keyword(s):  
Growth Rate ◽  
High Temperature ◽  
Water Stress ◽  
Plant Growth ◽  
Relative Growth Rate ◽  
Broad Bean ◽  
Day Length ◽  
Vegetative Period ◽  
Relative Growth ◽  
Made In

SummaryExperiments were made in glasshouses, growth cabinets and growth rooms to study the differential responses of the broad bean to water stress during the vegetative and flowering phases of growth. Plants in the flowering phase proved to be more sensitive to drought than in the vegetative period, and there were different responses (Relative Growth Rate) to temperature at different stages of plant growth. Day length and temperature influenced the position of the earliest flower initials on the stem, and intensity of flower shedding was aggravated by high temperature.

Effects of planting date on growth and yield of pigeon pea (Cajanus cajan (L.) Millsp.)

1976 ◽  
Vol 87 (3) ◽  
pp. 649-660 ◽  
Author(s):  
J. L. Hammerton
Keyword(s):  
Seasonal Pattern ◽  
Pigeon Pea ◽  
Planting Date ◽  
Day Length ◽  
Growth And Yield ◽  
Dominant Factor ◽  
Rust Disease ◽  
Flowering Branch ◽  
Made In ◽  
Number Of Branches

SummaryTwo dwarf pigeon pea cultivars, each at two spacings, were planted at 4-weekly intervals over a year. Differences in height and number of branches between cultivars and spacings were generally small but planting date had much greater effects. Heights at reaping were > 2 m in plantings made in March or April, but decreased with later planting to ca. 1 m in November–February plantings. Time from planting to reaping varied from ca. 120 days in September-February plantings to > 225 days in March or April plantings. Four of the 13 plantings showed loss of mainstem dominance. Defoliation by rust disease showed no seasonal pattern, nor any association with yield. March plantings showed a ‘preliminary’ flowering in which only some wide-spaced and perimeter plants flowered in late July. Yields varied from 0–5 to 10 t/ha as green pods, but one cultivar at a spacing of 0·45 × 0·45 m (49385/ha) gave a mean yield of ca. 5 ±0·57 t/ha. Late-May planting appeared the most efficient, giving a large number of pods per day, per flowering branch and per metre of height, but plants exceeded 2 m in height and took 200 days from planting to reaping. December or January planting gave smaller plants, taking ca. 125 days from planting to reaping. Day-length was a dominant factor influencing growth and yield, but part of this may have been a response to radiation rather than to photoperiod.

scholarly journals Cryopreservation of testicular tissue: an alternative to maintain the reproductive capacity in different animal species

2017 ◽  
Vol 47 (11) ◽  
Author(s):  
David Baruc Cruvinel Lima ◽  
Lúcia Daniel Machado da Silva
Keyword(s):  
Clinical Practice ◽  
Germ Cells ◽  
Animal Species ◽  
Testicular Tissue ◽  
Reproductive Capacity ◽  
Significant Progress ◽  
Breeding Programs ◽  
Artificial Breeding ◽  
Made In

ABSTRACT: Cryopreservation of testicular tissue enables the maintenance of reproductive capacity in different animal species, and contributes to the formation of gene banks for endangered species. The spermatogonia present in the testes can be grown in vitro and the sperm obtained can be used in artificial breeding programs. This review aimed to describe the main techniques of testicular cryopreservation, the main cryoprotectants used, as well as the progress made in different animal species thus far. In the last decade, significant progress has been made in obtaining viable and functional germ cells from testicular tissue. However, more research is needed to better establish protocols that can be used in clinical practice with various species.

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