Search Results
Results 251 - 300 of 589
< 1 2 3 4 5 6 7 8 9 10 11 >
de Carvalho Sabrina Cardozo Gonçalvez - - 2002
Temperature influence on the embryonic development of Anopheles aquasalis and An. albitarsis was investigated. At 26 degrees C, 75% and 60% of respectively An. aquasalis and An. albitarsis eggs hatched, with one peak of eclosion, between the 2nd and 3rd day after oviposition. At 20 +/- 2 degrees C, around ...
Cox Evelyn F - - 2002
Elevated nutrients have the potential to disrupt reproduction in scleractinian corals, with consequent impacts on population dynamics. Reproduction in broadcast spawning (Montipora capitata) and brooding (Pocillopora damicornis) species was assessed following exposure to elevated ammonium in a microcosm experiment. Planulation in P. damicornis ceased following 4 months of ammonium exposure ...
Todd Nancy E - - 2002
Sevin brand carbaryl insecticide is one of the most commonly used insecticides in the United States, with great potential for leaching into ground- and surface water reserves. Its possible teratogenic effects were tested on zebrafish eggs in four dilutions of decreasing concentration. The average mortality rate was low, indicating that ...
Irigoien Xabier - - 2002
Diatoms dominate spring bloom phytoplankton assemblages in temperate waters and coastal upwelling regions of the global ocean. Copepods usually dominate the zooplankton in these regions and are the prey of many larval fish species. Recent laboratory studies suggest that diatoms may have a deleterious effect on the success of copepod ...
Appleby M C - - 2002
1. A 3-year trial was carried out of cages for laying hens, occupying a full laying house. The main cage designs used were 5000 cm2 in area, 50 cm high at the rear and furnished with nests and perches. F cages had a front rollaway nest at the side, lined ...
James David G - - 2002
The effect of imidacloprid on fecundity in twospotted spider mites, Tetranychus urticae Koch, was investigated in laboratory experiments using individual females on bean leaf discs. Mites were directly exposed to spray formulations of imidacloprid or fed on discs cut from a systemically treated bean plant. Imidacloprid-treated T. urticae produced 10-26% ...
Fawole O O - - 2002
Aspects of the biology of Mormyrus rume (Cuvier and Valenciennes) in Lekki lagoon were investigated. This included the length-weight relationship, condition factor, food and feeding habits and the fecundity of the fish species. The major fishing methods employed for collecting the 225 specimens were castnetting and setnetting. The total lengths ...
Jamshidi A - - 2002
Brachyspira pilosicoli strain CPSp1 isolated from a chicken in a broiler breeder flock in Queensland was used to experimentally infect 40 individually caged 22-week-old laying hens. Another 10 birds were sham-inoculated with sterile broth. All chickens received a commercial layer diet, but 10 infected birds had 50 parts/10(6) zinc bacitracin ...
Miles CECELIA M. - - 2002
Egg masses of two populations of the ascoglossan Costasiella with different developmental modes were examined. Costasiella ocellifera is an encapsulated developer; Costasiella sp. has an obligate plankto-trophic larval stage. Adults of the two populations were also separable by habitat, but could not be distinguished by external morphology. Comparison of capsule ...
Grieco Fabrizio - - 2002
We experimentally show that in blue tits (Parus caeruleus) egg-laying date is causally linked to experience in the previous year. Females that received additional food in the nestling period in one year laid eggs later in the next year compared with the control birds, whatever the degree of synchronization with ...
Cameron Christopher B - - 2002
A new species of enteropneust, Harrimania planktophilus, lives intertidally and subtidally in mixed sediments in Barkley Sound, British Columbia, Canada. H. planktophilus has a long proboscis skeleton extending into the pharyngeal region. The collar (mesosome) has complete dorsal and ventral mesenteries. The trunk (metasome) has four distinct regions that can ...
Rajendran Somiahnadar - - 2002
The response of Rhyzopertha dominica and Sitophilus oryzae (both phosphine-resistant) in mixed-age cultures to phosphine at fixed concentration-time products (CT) of 10,500 to 168,000 microliters litre 1 h (ppm h) with either constant, rising or falling concentrations for 7 days was studied at 27 (+/- 2) degrees C. At lower ...
Tewksbury Joshua J - - 2002
Avian brood parasites reduce host fitness through the addition of parasitic eggs and the removal of host eggs. Both parasitic egg-addition and host egg-removal may be important sources of selection on host behaviour, creating fitness trade-offs with selection imposed by nest predation. However, the relative costs hosts suffer from egg-addition ...
Christians Julian K - - 2002
Egg size is a widely-studied trait and yet the causes and consequences of variation in this trait remain poorly understood. Egg size varies greatly within many avian species, with the largest egg in a population generally being at least 50% bigger, and sometimes twice as large, as the smallest. Generally, ...
Prasantha B D Rohitha - - 2002
The pulse beetle, Callosobruchus maculatus (F.) is a destructive pest of pulses in both storage and field. It is well known that diatomaceous earth (DE) kill the insects by locally absorbing the epicuticular lipid layers leading to high rate of water loss through the cuticle. However, the effectiveness of DE ...
Suderman Barbara L - - 2002
A 3-month microcosm study was conducted to observe the potential effects of two fuels, Orimulsion and Fuel Oil #6, on the hatching success of copepod resting eggs in the seabed of Tampa Bay, Florida. Microcosms were dosed with one of five hydrocarbon treatments via hydrocarbon-coated sand and compared with controls. ...
Sarna Mohinder - - 2002
In April 2000, we investigated an outbreak of gastroenteritis amongst attendees of a local community dinner in a Perth suburb. Of the 98 people interviewed (response rate 98%), 53 reported gastrointestinal symptoms (attack rate 54%). Faecal cultures from 11 cases, 2 food preparers, 1 waitress and leftover mock ice-cream dessert ...
Basant K. Agarwala
Effects of prey density and adult predator size on food consumption and oviposition were evaluated in an aphidophagous ladybird beetle, Menochilus sexmaculatus (F.), from tropical Asia. Both the functional response and reproductive numerical response showed an upper asymptote at 40 adult Aphis craccivora Koch/female/150 cm2. Proportions of aphids consumed and ...
Ismail N M - - 2001
The tested foods are tropical fish food (tetramine), rat food, blue green algae, dried lettuce leaves and a mixture of all these foods. The results indicated that feeding of B. alexandrina on a mixture of foods increased their growth and survival rates and their susceptibility to S. mansoni. Tetramine elevated ...
Sockman K W - - 2001
The concentrations of maternally derived androgens in the yolks of avian eggs vary within and among clutches, but a mechanistic basis for this variation has not been elucidated. We investigated in the American kestrel, Falco sparverius, whether changes in plasma-prolactin concentrations induced by changes in photoperiod and food supply affect ...
McCracken R J - - 2001
The use of furazolidone in food-producing animals is banned within the EU. Detection of the protein-bound side-chain metabolite, 3-amino-2-oxazolidinone (AOZ), in animal tissues is the most effective method of enforcing the ban. The study was undertaken to find out if the same applies to eggs. The concentrations of furazolidone and ...
Hatle J D - - 2001
Many organisms exhibit developmental plasticity only in sensitive phases and cannot respond to environmental perturbations at other times. However, we know little about the physiological events that define plastic and canalized phases. During egg production in insects, vitellogenin (Vg) accumulates first in the hemolymph and then in the eggs. In ...
Gefen E - - 2001
We measured oxygen consumption (V(O(2))) and carbon dioxide emission (V(CO(2))) rates, air-cell gas partial pressures of oxygen (P(A)O(2)) and CO(2) (P(A)CO(2)), eggshell water vapour conductance and energy content of the ostrich (Struthio camelus) egg, 'true hatchling' and residual yolk, and calculated RQ and total oxygen consumption (V(O(2)tot)) for ostrich eggs ...
Wauters A M - - 2001
The aim of these experiments was to determine if previous experience of chicks' response to food calling influences subsequent propension of maternal hens to utter food calls. Seventeen broody hens were tested three times a day without their 3- or 4-day-old chicks. Hens were tested in two situations: chicks were ...
Teston J A - - 2001
Larvae of Anicla infecta (Ochsenheimer, 1816) (Noctuidae) feed upon many grasses and may be harmful to cereals and fodder of economic importance. This study was developed aiming to contribute to knowledge of the biology of this species. The rearing was done in an environmental chamber with the following settings: temperature ...
Hefle S L - - 2001
Chicken eggs are used extensively as an excellent source of dietary proteins. These proteins have many functional properties, making them valuable food ingredients. However, eggs are a frequent cause of food hypersensitivity, especially in children. Of major concern to food processors is the inadvertent cross-contact of food products with allergenic ...
Moon R D - - 2001
A sand dilution assay was developed to study how composting affects the nutritional value of stored laying hen manure for larvae of the house fly, Musca domestica L. Equal numbers of eggs were inoculated into graded amounts of stock manure and incubated under standardized moisture conditions. Survival and mass per ...
Mikheev V N - - 2001
The habitat distribution of overwintered eggs, which were found to be the only source of spring recruitment of Argulus coregoni Thorell, was studied at a commercial fish farm in Central Finland. The frequency of occurrence of egg clutches in the deep parts of the canals and ponds was 50 to ...
Harrington L C - - 2001
Mosquitoes that do not oviposit their entire batch of eggs in one location, but choose instead to oviposit a few eggs in several different sites exhibit skip oviposition. Although skip oviposition may ensure the greater distribution of progeny from an individual female and reduce sibling competition, it also uses greater ...
Balevi T - - 2001
1. The effects of dietary supplementation of a commercial probiotic (Protexin) on daily feed consumption, egg yield, egg weight, food conversion ratio and humoral immune response in layer hens were investigated. In 7 replicates, a total of 280 40-week-old layers were given diets containing either 0, 250, 500 or 750 ...
Hatta H - - 2001
Native ovalbumin has been known to convert into a heat-stable form, S-ovalbumin, either in an avian shell egg or in an isolated ovalbumin solution. Recently, similar conversion of ovalbumin in fertile eggs was also reported. We found that the conversion into S-ovalbumin was slower in fertile eggs than in unfertile ...
Rojas N E - - 2001
The roles of some abiotic factors in controlling the hatching rates of Moina micrura ephippial eggs were investigated. Determination of optimum hatching conditions would be important in developing the use of this species as a food for fish larvae in aquaculture. Ephippia were exposed to different treatments in the laboratory, ...
de Melo Ximenes M de F Mde - - 2001
Lutzomyia evandroi Costa Lima and Antunes, 1936 is found in Rio Grande do Norte, northeastern Brazil, in areas of visceral and mucocutaneous leishmaniasis and follows the same geographic distribution of L. longipalpis. The biological cycle, oviposition, morphological and behavioral characteristics of the species were studied under experimental conditions. The average ...
Woods H A - - 2001
We examined the effects of desiccation on eggs and first-instar larvae of two species of Lepidoptera, Grammia geneura (Arctiidae) and Manduca sexta (Sphingidae). Grammia geneura occurs primarily in grasslands and savannas of the southwestern United States; M. sexta co-occurs with G. geneura but also is cosmopolitan across much of the ...
Msoffe P L - - 2001
A study was conducted to determine the variations in physical characters and immunocompetence among scavenging local chicken ecotypes in Tanzania. Eighty-four adult scavenging local chickens from four eco-climatic regions of Tanzania were studied. Measurements of adult body weight, body length, shank length and egg weight and observations of plumage colour ...
Skolbekken R - - 2001
The trade-off between parental care and feeding was studied in the male two-spotted goby (Gobiusculus flavescens F.). Two temperatures, 8.5 degrees C and 13.0 degrees C, were used, with five replicates at each temperature, in order to determine whether temperature influenced parental behaviour. In each replicate, two males and four ...
Rivero A - - 2001
In holometabolous insects reproductive success is strongly determined by the nutritional resources available to the females. In addition to nutrients derived from adult feeding, resources for egg production may come from the limited reserves accumulated during the larval stages. The pattern of allocation of these larval reserves to egg production ...
Gous R M - - 2001
1. An experiment was designed to test the hypothesis that delayed sexual maturity in pullets reared on very short (4 h) constant photoperiods might be partly attributable to limitation of food intake and that offering a pelleted feed might circumvent this effect. 2. The factors investigated were 2 strains (Amber ...
Koelkebeck K W - - 2001
As part of a national retail egg quality study, the variety of shell eggs and egg products offered for sale, type of packaging, and price relationships were compared in five major metropolitan regions. A total of 81 stores in 28 cities were sampled in California (CA), Illinois (IL), North Carolina ...
Hirokado M - - 2001
A simple and rapid method using capillary zone electrophoresis (CZE) for the determination of milt protein (MP), which contains mainly protamine, and polylysine (PL) in food additive preparations and processed foods was developed. CZE separation was performed on poly(vinyl alcohol)-coated capillaries at a column temperature of 20 degrees C with ...
Taylor P E. - - 2001
In intensive farming systems, the animals have little control over important elements in their environments. For instance, food of a pre-set type is delivered at set times, and the lighting schedule is controlled by the farmer. It has been suggested that low levels of environmental control over important events may ...
Peña N - - 2001
A bienzyme amperometric composite biosensor for the determination of free and total cholesterol in food samples is reported. Cholesterol oxidase and horseradish peroxidase, together with potassium ferrocyanide as a mediator, are incorporated into a graphite-70% Teflon matrix. The compatibility of this biosensor design with predominantly nonaqueous media allows the use ...
Indar-Harrinauth L - - 2001
A prospective case-control study involving 46 case patients and 92 age- and neighborhood-matched control subjects was conducted in Trinidad and Tobago (T&T) between March 1998 and May 1999 to determine the etiology, sources, and risk factors for Salmonella enteritidis (SE) infection. SE infection in T&T was found to be associated ...
Inal F - - 2001
1. This study was conducted as three trials. 2. In the first trial, zinc, manganese, copper and iron concentrations were determined in dietary raw materials collected from various regions of Turkey. 3. In the second trial, 200 Hisex Brown laying hens, 30 weeks of age, were divided into two groups. ...
Wegener R - - 2001
Egg deposition of the elm leaf beetle Xanthogaleruca luteola causes the emission of volatiles from its food plant, Ulmus minor. These volatiles are exploited by the egg parasitoid, Oomyzus gallerucae, to locate its host. In contrast to other tritrophic systems, the release of volatiles is not induced by feeding but ...
Bridges P A - - 2001
Egg phosphatidylcholine liposomes were freeze-dried in the presence and absence of trehalose. The lyophilized liposomes were rehydrated and aerosolized using a Pari LC jet nebulizer. The size of the aerosols generated was determined by laser diffraction, which was also used to determine the size distribution of the liposomes before lyophilization, ...
Radkowski M - - 2001
The purpose of this study was to determine the prevalence of Salmonellae on egg shells in markets in Olsztyn, Poland. An investigation carried out by the Sanitary and Epidemiological Station into cases of food poisoning caused in Poland by Salmonella spp. in recent years showed that the largest number of ...
Williams T D - - 2001
A negative relationship, or trade-off, between egg size and clutch size is a central and long-standing component of life-history theory, yet there is little empirical evidence for such a trade-off, especially at the intraspecific level. Here, I show that female zebra finches (Taeniopygia guttata) treated chronically during egg formation with ...
Goutner V - - 2001
Lead and cadmium concentrations were measured in eggs of collonially nesting waterbirds with different position in the food chains of Greek wetlands of international importance. Differences were found between species in the levels of both lead and cadmium in the Evros and Axios Deltas attributable to their different diets. Nevertheless, ...
Popov A V - - 2001
XMAP215 belongs to a family of proteins involved in the regulation of microtubule dynamics. In this study we analyze the function of different parts of XMAP215 in vivo and in Xenopus egg extracts. XMAP215 has been divided into three fragments, FrN, FrM and FrC (for N-terminal, middle and C-terminal, respectively). ...
< 1 2 3 4 5 6 7 8 9 10 11 >