| migratory birds of central washington as reservoirs of campylobacter jejuni. | migratory ducks, canada geese, and sandhill crane from the pacific north american flyway have been screened for campylobacter spp. samples (298) from these birds were examined and the incidence of campylobacter spp. in the samples were as follows: sandhill crane (grus canadensis tabida), 81%; ducks (aythya collaris, anas carolinensis, aythya americana, and anas platyrhynchos), 73%; and canada geese (branta canadensis), 5%. all isolates were identified as campylobacter jejuni. to our knowledge th ... | 1988 | 3378202 |
| survey for blood parasites in redheads (aythya americana) wintering at the chandeleur islands, louisiana. | we detected no infections with species of plasmodium, haemoproteus, leucocytozoon, sarcocystis or trypanosoma in blood smears, liver and spleen impressions, and muscle tissue from 136 redheads (aythya americana) collected or captured at the chandeleur islands, louisiana (usa), during three winters (1987 to 1990). one bird, a juvenile male, was infected with an unidentified species of microfilaria. thus, we found no evidence that hematozoa had an effect on redheads during the course of the study. | 1995 | 7563433 |
| geographical gradients in the population dynamics of north american prairie ducks. | 1. geographic gradients in population dynamics may occur because of spatial variation in resources that affect the deterministic components of the dynamics (i.e. carrying capacity, the specific growth rate at small densities or the strength of density regulation) or because of spatial variation in the effects of environmental stochasticity. to evaluate these, we used a hierarchical bayesian approach to estimate parameters characterizing deterministic components and stochastic influences on popul ... | 2008 | 18631261 |
| complete sequence of the japanese quail (coturnix japonica) mitochondrial genome and its genetic relationship with related species. | the japanese quail (coturnix japonica; jq) is one of the domesticated fowl species of japan. to provide dna sequence information for examination of its phylogenetic position in the order galliformes, the complete sequence of the jq mitochondria was determined. sequence analysis revealed that the jq mitochondrial genome is a circular dna of 16 697 basepairs (bp), which is smaller than the chicken mitochondrial dna of 16 775 bp, but the genomic structure of jq mitochondria was the same as that of ... | 2001 | 11736810 |
| virulence of six strains of duck plague virus in eight waterfowl species. | susceptibility of new world waterfowl to the lake andes strain of duck plague virus (dpv) was assessed by intramuscular inoculation of adult muscovies (cairina moschata), mallards (anas platyrhynchos), canada geese (branta canadensis), wood ducks (aix sponsa), redheads (aythya americana), gadwalls (anas strepera), blue-winged teal (anas discors), and pintails (anas acuta). the relative virulence of dpv strains isolated from five united states and one canadian location was established in muscovie ... | 1996 | 8827671 |
| the detection of pollutant impact in marine environments: condition index, oxidative dna damage, and their associations with metal bioaccumulation in the sydney rock oyster saccostrea commercialis. | specimens of the sydney rock oyster saccostrea commercialis were deployed for a 3-month period at control and sewage disturbed marine locations in the hunter region, new south wales, australia. the dna damage product,8-hydroxyguanine, was measured by gc/ms-sim from chromatin extracts of the gill tissues of oysters to assess oxidative damage. the levels ranged from 11.5 to 18.8 modified bases per 10(7) guanine bases. although the condition indices were significantly different between the redhead ... | 1996 | 8781068 |
| genome comparisons in the yeastlike fungal genus galactomyces redhead et malloch. | the g+c contents of the dnas of 41 strains belonging to the genus galactomyces redhead et malloch were determined by the thermal denaturation method. melting profiles revealed that the dnas of these strains are heterogeneous. four groups were recognized on the basis of this heterogeneity. however, dna similarity values, which were calculated by using dna-dna reassociation kinetics, revealed that the strains could be divided into six subgroups. strains belonging to the same subgroup exhibited hig ... | 1995 | 7547306 |
| accumulation of 14c-naphthalene in the tissues of redhead ducks fed oil-contaminated crayfish. | crayfish, artificially contaminated with 14c-naphthalene-5% water-soluble fraction of no. 2 fuel oil, were force-fed to one-year-old redhead ducks to determine the accumulation of petroleum hydrocarbons. the relative distribution of carbon-14 activity in the gall bladder containing bile, and fat were similar, and significantly greater (p less than 0.05) than the activity in the blood, brain, liver, and kidney. there was a significant increase (p less than 0.05) in the disintegrations per minute ... | 1982 | 7092321 |
| the acyl-enzyme mechanism of beta-lactamase action. the evidence for class c beta-lactamases. | methanol or ethanol can replace water in the action of certain chromosomal beta-lactamases on benzylpenicillin: the products are alpha-methyl or alpha-ethyl benzylpenicilloate. the beta-lactamases were from a mutant of pseudomonas aeruginosa 18s that produces the enzyme constitutively [flett, curtis & richmond (1976) j. bacteriol. 127, 1585-1586; berks, redhead & abraham (1982) j. gen. microbiol. 128, 155-159] and from escherichia coli k12 (the ampc beta-lactamase) [lindström, boman & steele (19 ... | 1982 | 6818947 |
| social interaction with siblings is necessary for visual imprinting of species-specific maternal preferences in ducklings (anas platyrhynchos). | this study was conducted to examine the influence of various social rearing experiences on the development of imprinted visual maternal preferences in domestic mallard ducklings (anas platyrhynchos) during the first 3 days of postnatal life. twenty-four-hour-old ducklings were allowed to follow a stuffed mallard hen for 30 min. this experience resulted in a visual preference for the familiar mallard hen over an unfamiliar stuffed redhead (aythya americana) hen in simultaneous choice tests at 48 ... | 1985 | 4075777 |
| complete mitochondrial dna sequencing of vieja synspila, a cichlid fish. | the redhead cichlid (vieja synspila) is an important aquarium fish and a useful phylogenetic organism of the cichlidae family. in this study, we sequenced the mitochondrial genome of the redhead cichlid for the first time. the mitogenome (16,543 bp) had the typical mitochondrial characteristics of other cichlid fish, including 13 protein-coding, 22 trna, two rrna genes and one putative control region. this sequence will be helpful in studying the phylogenetic relationships between cichlid fish. | 2016 | 24919503 |
| effects of social experience on visually imprinted maternal preferences in peking ducklings. | if peking ducklings are given social experience with agemates after their initial exposure to a maternal imprinting model (a stuffed mallard hen) their subsequent maternal preferences in simultaneous choice tests are different from those of isolate-reared ducklings. early in development (at 48 hr after hatching), they show a visual preference for the mallard over a redhead model, a difficult discrimination that isolated birds do not make (experiment i). however, later in development (at 72 hr af ... | 1985 | 3987972 |
| the contribution of nasal receptors to the cardiac response to diving in restrained and unrestrained redhead ducks (aythya americana). | in restrained redhead ducks, forced submergence caused heart rate to fall from 100 +/- 3 beats min-1 (mean +/- s.e.m., n = 12) to a stable underwater rate of 35 +/- 4 beats min-1 (n = 12) within 5 s after submergence. bradycardia was unaffected by breathing oxygen before a dive, but was virtually eliminated by local anaesthesia of the narial region. in contrast, in a dabbling duck (anas platyrhynchos) bradycardia in short dives was eliminated by breathing oxygen before a dive. in unrestrained di ... | 1986 | 3958677 |
| habituation of the cardiac response to involuntary diving in diving and dabbling ducks. | 1. bradycardia in response to forced submergence was habituated in dabbling (anas platyrhynchos, linnaeus) and diving (aythya americana, eyton) ducks by repetitively submerging the animals, each day for several days, for periods of 40 and 20 s, respectively. the onset of pronounced bradycardia was delayed with each successive trial, until little or no bradycardia occurred during submergence. diving bradycardia is driven by chemoreceptors in the dabbler and caused by stimulation of narial recepto ... | 1987 | 3694117 |
| social specificity: interaction with own species is necessary to foster species-specific maternal preference in ducklings. | previous studies have shown that if domestic mallard ducklings are allowed social interaction with broodmates after their initial exposure to a stuffed mallard (anas platyrhynchos) hen, they later show a visual preference for the familiar mallard over an unfamiliar redhead (aythya americana) hen. birds kept in social isolation do not make this difficult discrimination. in the present study, we examined whether this social enhancement of imprintability to a natural maternal model is merely the re ... | 1988 | 3378677 |
| maternal and peer imprinting in mallard ducklings under experimentally simulated natural social conditions. | previous studies revealed that if socially reared mallard ducklings actively follow a stuffed mallard (anas platyrhynchos) hen, they later show a visual preference for the familiar mallard hen over an unfamiliar redhead (aythya americana) hen. the present study determined that the experience of actively following the hen is essential to the induction of a visually controlled, species-typical, maternal preference. domestic mallard ducklings that had not been given the opportunity to follow the ma ... | 1989 | 2759358 |
| blood flow distribution in submerged and surface-swimming ducks. | observations that the response of the avian heart rate to submergence varies under different circumstances have led to speculation about variability of blood flow distribution during voluntary dives. we used a radiological imaging technique to examine the patterns of circulating blood flow in captive redhead ducks (aythya americana) during rest, swimming, escape dives, forced dives and trapped escape dives and have shown that blood flow distribution in escape dives was the same as that in ducks ... | 1992 | 1602277 |
| duck plague virus replication in muscovy duck fibroblast cells. | duck embryo fibroblast cell cultures from seven species of ducks were compared for virus yield, plaque quality, and sensitivity to infection by the duck plague herpesvirus (duck virus enteritis). muscovy duck and wood duck cells gave the best results for virus yield and plaque quality, but muscovies were considered superior because they are more available than wood ducks. pintails and lesser scaup gave the poorest results, and pekin duck, black duck, and redhead duck were intermediate. a growth ... | 1976 | 986808 |
| methods of estimating total lipid content in the redhead duck (aythya americana) and an evaluation of condition indices. | | 1979 | 540286 |
| variation in viral shedding patterns between different wild bird species infected experimentally with low-pathogenicity avian influenza viruses that originated from wild birds. | the prevalence of infection with avian influenza (ai) virus varies significantly between taxonomic orders and even between species within the same order. the current understanding of ai infection and virus shedding parameters in wild birds is limited and largely based on trials conducted in mallards (anas platyrhynchos). the objective of the present study was to provide experimental data to examine species-related differences in susceptibility and viral shedding associated with wild bird-origin ... | 2011 | 21500030 |
| avian influenza survey in migrating waterfowl in sonora, mexico. | a two-year survey was carried out on the occurrence of avian influenza in migrating birds in two estuaries of the mexican state of sonora, which is located within the pacific flyway. cloacal and oropharyngeal swabs were collected from 1262 birds, including 20 aquatic bird species from the moroncarit and tobari estuaries in sonora, mexico. samples were tested for type a influenza (m), h5 eurasian and north american subtypes (h5ea and h5na respectively) and the h7 north american subtype (h7na). ge ... | 2010 | 21091641 |
| sexual imprinting misguides species recognition in a facultative interspecific brood parasite. | sexual reproduction relies on the recognition of conspecifics for breeding. most experiments in birds have implicated a critical role for early social learning in directing subsequent courtship behaviours and mating decisions. this classical view of avian sexual imprinting is challenged, however, by studies of megapodes and obligate brood parasites, species in which reliable recognition is achieved despite the lack of early experience with conspecifics. by rearing males with either conspecific o ... | 2010 | 20484239 |
| complement-inhibiting iridoids from morinda morindoides. | morinda morindoides (baker) milne-redhead (syn. gaertnera morindoides bak.) is one of the most popular medicinal plants in the democratic republic of congo. in relation to its traditional use against rheumatic pains, fractionation of both the etoac- and the n-buoh-soluble fraction of the 80% meoh extract of the leaves, guided by the anticomplementary activity on the classical activation pathway, yielded eight novel iridoids (1-8), all containing a spirolactone functionality. their structure was ... | 2003 | 12542353 |
| the pigmented life of a redhead. | as a redhead i have had a personal interest in red hair, freckles and sunburns since childhood. an observation of a formaldehyde-induced fluorescence in human epidermal melanocytes initiated my scientific interest in these cells. prota and nicolaus demonstrated that oxidation products of cysteinyldopas are the main components of pheomelanin. our identification of 5-s-cysteinyldopa as the source of formaldehyde-induced fluorescence of normal and pathological melanocytes started a series of invest ... | 2004 | 15016311 |
| similarity and discrimination in human pavlovian conditioning. | we report three pavlovian eyelid conditioning experiments with humans, designed to experimentally decide between elemental and configural learning theories. we used two different designs originally proposed by redhead and pearce (1995). in experiments 1 and 2, three stimulus elements, a, b, and c, were presented in all possible combinations. all patterns were reinforced except for pattern abc (a/b/c+, ab/ac/bc+, abc-). according to elemental learning theories, response proportions on a/b/c+ tria ... | 2003 | 12820863 |
| complete nucleotide sequence of the coturnix chinensis (blue-breasted quail) mitochondrial genome and a phylogenetic analysis with related species. | coturnix chinensis (blue-breasted quail) has been classically grouped in galliformes phasianidae coturnix, based on morphologic features and biochemical evidence. since the blue-breasted quail has the smallest body size among the species of galliformes, in addition to a short generation time and an excellent reproductive performance, it is a possible model fowl for breeding and physiological studies of the coturnix japonica (japanese quail) and gallus gallus domesticus (chicken), which are class ... | 2002 | 12642645 |
| neopsilotrema n. g. (digenea: psilostomidae) and three new species from ducks (anseriformes: anatidae) in north america and europe. | neopsilotrema n. g. (digenea: psilostomidae) and three new species of psilostomid digeneans are described from birds in north america and europe: neopsilotrema lakotae n. sp. from aythya americana (eyton) in north dakota, usa, neopsilotrema affine n. sp. from aythya affinis (eyton) in minnesota, usa and neopsilotrema lisitsynae n. sp. from anas crecca l. in kherson region, ukraine. neopsilotrema n. g. shares a bipartite seminal vesicle with only three genera within the psilostomidae, psilotornus ... | 2016 | 27095661 |
| complete mitochondrial genome of the indian peafowl (pavo cristatus), with phylogenetic analysis in phasianidae. | pavo cristatus, known as the indian peafowl, is endemic to india and sri lanka and has been domesticated for its ornamental and food value. however, its phylogenetic status is still debated. here, to clarify the phylogenetic status of p. cristatus within phasianidae, we analyzed its mitochondrial genome (mtdna). the complete mitochondrial dna (mtdna) genome was determined using 34 pairs of primers. our data show that the mtdna genome of p. cristatus is 16,686 bp in length. molecular phylogenetic ... | 2015 | 24409883 |
| estimated seepage rates from selected ditches, ponds, and lakes at the camas national wildlife refuge, eastern idaho. | the camas national wildlife refuge (refuge) in eastern idaho, established in 1937, contains wetlands, ponds, and wet meadows that are essential resting and feeding habitat for migratory birds and nesting habitat for waterfowl. initially, natural sources of water supported these habitats. however, during the past few decades, changes in climate and surrounding land use have altered and reduced natural groundwater and surface-water inflows, resulting in a 5-meter decline in the water table and an ... | 2017 | 28285803 |
| indanyloxyacetic acid-sensitive chloride channels from outer membranes of skeletal muscle. | in mature mammalian muscle, the chloride conductance of the membrane is an important factor in the regulation of excitability. up to now, no ligand was available for the biochemical characterization of muscle chloride channels. in order to localize and characterize these channels, we have used indanyloxyacetic acid (iaa)-94, a ligand previously used for epithelial cl- channels (landry, d. w., reitman, m., cragoe, e. j., jr., and al-awqati, q. (1987) j. gen. physiol. 90, 779-798; landry, d. w., a ... | 1993 | 7678003 |
| the melanoma-linked "redhead" mc1r influences dopaminergic neuron survival. | individuals with parkinson disease are more likely to develop melanoma, and melanoma patients are reciprocally at higher risk of developing parkinson disease. melanoma is strongly tied to red hair/fair skin, a phenotype of loss-of-function polymorphisms in the mc1r (melanocortin 1 receptor) gene. loss-of-function variants of mc1r have also been linked to increased risk of parkinson disease. the present study is to investigate the role of mc1r in dopaminergic neurons in vivo. | 2017 | 28019657 |
| in vitro immunomodulatory activity, cytotoxicity and chemistry of some central european polypores. | context some mushrooms of the order polyporales are known for their immunomodulatory actions. objective the objective of this study is to evaluate the in vitro phagocytic and cytotoxic effects of extracts from polyporales native to central europe. materials and methods the effects of ethanol extracts from 27 polypore species on opsonized zymosan-induced phagocytosis of isolated human neutrophils were tested by a chemiluminescence method. colon epithelial cell lines, caco-2 and ht-29, were used f ... | 2016 | 26984176 |
| synonymous codon usage pattern in mitochondrial cyb gene in pisces, aves, and mammals. | cytochrome b (cyb) protein plays an important role in complex iii of the mitochondrial oxidative phosphorylation. codon usage is the phenomenon of non-uniform usage of synonymous codons. in the present study, we report the pattern of codon usage in mt-cyb gene using various codon usage parameters. nucleotide composition such as % of c and t was higher than a and g in pisces. in aves, % of a and c was higher than t and g but in mammals, a and t was higher than c and g. heat map shows that at-endi ... | 2017 | 26634951 |
| active sites of beta-lactamases. the chromosomal beta-lactamases of pseudomonas aeruginosa and escherichia coli. | an acyl-enzyme was isolated from certain chromosomal beta-lactamases and a penicillin. the penicillin was cloxacillin which, although it is a substrate for these enzymes, has such a low kcat. that it functions as an inhibitor. the enzymes were from the mutant of pseudomonas aeruginosa 18 s that produces the beta-lactamase constitutively [flett, curtis & richmond (1976) j. bacteriol. 127, 1585-1586; berks, redhead & abraham (1982) j. gen. microbiol., in the press] and from escherichia coli k-12 ( ... | 1982 | 6807285 |
| thermal processing of formamide ices on silicate grain analogue. | fourier transform-infrared spectroscopy (ft-ir) and temperature programmed desorption (tpd) have been used to examine the thermal processing of three isotopes of pure formamide ice (hconh2, dconh2, and hcond2) adsorbed on a sio2 interstellar grain analogue. pure formamide ice on sio2 nanoparticles displays at least three different phases that we interpret as a porous phase from ∼70-145 k, a compacted polycrystalline phase from ∼145-210 k, and a third slow diffusion and sublimation phase from ∼21 ... | 2014 | 24460066 |
| temperature effects on adsorption and diffusion dynamics of ch3ch2(ads) and h3c-c≡c(ads) on ag(111) surface and their self-coupling reactions: ab initio molecular dynamics approach. | density functional theory (dft)-based molecular dynamics (dftmd) simulations in combination with a fourier transform of dipole moment autocorrelation function are performed to investigate the adsorption dynamics and the reaction mechanisms of self-coupling reactions of both acetylide (h3c-c(β)≡c(α) (ads)) and ethyl (h3c(β)-c(α)h2(ads)) with i(ads) coadsorbed on the ag(111) surface at various temperatures. in addition, the calculated infrared spectra of h3c-c(β)≡c(α)(ads) and i coadsorbed on the ... | 2014 | 24437901 |
| isotope effect in the photochemical decomposition of co2 (ice) by lyman-α radiation. | the photochemical decomposition of co2(ice) at 75 k by lyman-α radiation (10.2 ev) has been studied using transmission infrared spectroscopy. an isotope effect in the decomposition of the co2 molecule in the ice has been discovered, favoring (12)co2 photodecomposition over (13)co2 by about 10%. the effect is caused by electronic energy transfer from the excited co2 molecule to the ice matrix, which favors quenching of the heavier electronically-excited (13)co2 molecule over (12)co2. the effect i ... | 2013 | 23614418 |
| intra-guild interactions and projected impact of climate and land use changes on north american pochard ducks. | the co-occurrence of functionally similar species is very common in nature, and is often put forward as a basis for ecosystem resilience to disturbance. at the same time, competition between similar species is also considered a strong driver of community composition. however, environmental stochasticity can alter this prediction, either because competitive abilities depend on time-varying factors or because covariance in species' responses to environmental conditions masks the effect of competit ... | 2013 | 23322386 |
| integrated modeling of communities: parasitism, competition, and demographic synchrony in sympatric ducks. | functionally similar species often co-occur within an ecosystem, and they can compete for or facilitate each other's access to resources. the coupled dynamics of such species play an important role in shaping biodiversity and an ecosystem's resilience to perturbations. here we study two congeneric north american ducks: redhead aythya americana and canvasback a. vaselineria. both are largely sympatric during the breeding season, and in addition to competition, facultative parasitic egg-laying can ... | 2012 | 23236916 |
| demographic response to perturbations: the role of compensatory density dependence in a north american duck under variable harvest regulations and changing habitat. | 1. most wild animal populations are subjected to many perturbations, including environmental forcing and anthropogenic mortality. how population size varies in response to these perturbations largely depends on life-history strategy and density regulation. 2. using the mid-continent population of redhead aythya americana (a north american diving duck), we investigated the population response to two major perturbations, changes in breeding habitat availability (number of ponds in the study landsc ... | 2012 | 22433018 |
| there's nothing like a redhead! | | 2006 | 16519197 |
| local chemical reaction of benzene on cu110 via stm-induced excitation. | we have investigated the mechanism of the chemical reaction of the benzene molecule adsorbed on cu(110) surface induced by the injection of tunneling electrons using scanning tunneling microscopy (stm). with the dosing of tunneling electrons of the energy 2-5 ev from the stm tip to the molecule, we have detected the increase of the height of the benzene molecule by 40% in the stm image and the appearance of the vibration feature of the nu(c-h) mode in the inelastic tunneling spectroscopy (iets) ... | 2004 | 15267408 |
| ultrafast laser excitation of co/pt(111) probed by sum frequency generation: coverage dependent desorption efficiency. | co photodesorption from pt(111) induced by femtosecond laser pulses is probed by ir+visible sum frequency generation (sfg). steady state analysis of sfg spectra at varying co pressure and laser fluence allows one to measure a approximately 5 orders of magnitude decrease of the photodesorption rate constant when co coverage decreases from 0.37 to 0.07 monolayer. we ascribe this effect in the framework of the menzel-gomer-redhead mechanism to electron delocalization in the co layer. the lifetime o ... | 2004 | 15245295 |
| direct and indirect diet and dimet from semiconductor and metal surfaces: what can we learn from 'toy models'? | desorption induced by electronic transitions (diet) and its variant dimet (m = 'multiple'), are among the simplest possible "reactions" of ad-species involving ultra-short lived electronically excited states at surfaces. the non-adiabatic bond-cleavage can be enforced, for example, with laser irradiation or with electrons or holes emitted from the tip of a scanning tunnelling microscope (stm). the transient creation of excited intermediates can proceed directly (localised to the adsorbate-substr ... | 2000 | 11272004 |
| slow rehabilitation of a traumatic lower limb amputee. | a 65-year-old male (gm) was referred to the physiotherapy department of the regional limb fitting centre for outpatient rehabilitation following a right transfemoral amputation five weeks previously. he had been knocked down by a bus and suffered a crush injury to the right leg resulting in a stable fracture to the right pubic ramus, a fractured skull and orbital bone. immediately following admission to the local district general hospital, his right leg was amputated at the transfemoral level. h ... | 1998 | 9859131 |
| plumage phenotypes and mate preferences in japanese quail 2. sexual imprinting. | mate selection, with emphasis on early social (sexual imprinting) and subsequent long-term social experience, was studied in a randombred population of japanese quail consisting of wildtype (w), redhead (r) and albino (a) plumage colors. early social experiences involved situations where flocks of the various plumage colors were maintained either separately or intermingled. initial mate preferences were determined from a series of paired choice-tests between plumage phenotypes. wildtype and redh ... | 1983 | 24923714 |
| cyanide-insensitive respiration in relation to growth of a low-temperature basidiomycete. | the cyanogenic low-temperature basidiomycete (coprinus psychromorbidus redhead and traquair), unlike other cyanide-tolerant fungi, does not detoxify cyanide via formamide hydro-lyase. instead, tolerance apparently depends on cyanide-insensitive respiration involving activity of the mitochondrial alternative oxidase. respiration and growth of young mycelium that lacks alternative oxidase activity are blocked both by cyanide and 1 mum antimycin. when activity of the alternative oxidase is elicited ... | 1982 | 16662355 |
| redhead and outlaw; a study in criminal anthropology. | | 2010 | 20253450 |
| biota from the coastal wetlands of praia da vitória (terceira, azores, portugal): part 3 - birds. | the data presented here come from field observations of aves between august 2013 and october 2018 as part of a life research project aiming to preserve and restore three coastal wetlands from praia da vitória (terceira island, azores, portugal). systematic monthly observations were carried out for five years in order to provide a checklist and monitoring of bird species and subspecies observed in three sites: paul da praia da vitória (ppv), paul do belo jardim (pbj) and paul da pedreira do cabo ... | 2019 | 31182911 |
| temperature programmed decomposition (tpde) of [mo(co)(6)] on metal oxide supports: a novel tool to elucidate surface acidity and surface-mediated reactions. | a novel technique, the temperature programmed decomposition (tpde) of [mo(co)(6)], has been developed to examine surface acid/base properties. in particular, the nucleophility of different surface hydroxyl groups can be quantified with this method, and it is found that the activation energy for decarbonylation of the carbonyl complex correlates well with the field strength of the metal cations in the support. activation energies are derived from the co peak maxima in the tpde spectra by means of ... | 1998 | 18967057 |
| pak2a mutations cause cerebral hemorrhage in redhead zebrafish. | the zebrafish is a powerful model for studying vascular development, demonstrating remarkable conservation of this process with mammals. here, we identify a zebrafish mutant, redhead (rhd(mi149)), that exhibits embryonic cns hemorrhage with intact gross development of the vasculature and normal hemostatic function. we show that the rhd phenotype is caused by a hypomorphic mutation in p21-activated kinase 2a (pak2a). pak2 is a kinase that acts downstream of the rho-family gtpases cdc42 and rac an ... | 2007 | 17715297 |
| the story of ferris urbanowski: california, here we come! | although childbirth educators may not all have known her by name, the lovely redhead who was the star childbirth educator in the 1970s film the story of eric was a familiar face. after viewing the film numerous times in our classes, early childbirth educators all felt that we knew her. ferris urbanowski was an early crusader for the lamaze method of childbirth preparation in california in the 1960s. she worked to convince physicians in the los angeles area of the merits of the method, to establi ... | 2001 | 17273248 |
| comparing elemental and configural associative theories in human causal learning: a case for attention. | in two causal learning experiments with human participants, the authors compared various associative theories that assumed either elemental (unique cue, modified unique cue, replaced elements model, and harris' model) or configural processing of stimuli (pearce's theory and a modification of it). the authors used modified patterning problems initially suggested by redhead and pearce (1995). predictions for all theories were generated by computer simulations. both configural theories and the uniq ... | 2008 | 18426312 |
| estrogen mediated effects in the sydney rock oyster, saccostrea glomerata, following field exposures to sewage effluent containing estrogenic compounds and activity. | the sydney rock oyster, saccostrea glomerata, has been demonstrated as a useful biomonitor of estrogenic compounds following laboratory exposures, yet its utility in the assessment of estrogenic exposure and effects under field conditions requires investigation. to achieve this aim, s. glomerata were deployed in newcastle, australia in the effluent receiving marine waters of burwood beach wwtp (burwood beach "near", <50 m from outfall and burwood beach "far", 100-150 m from outfall) and referenc ... | 2012 | 22673404 |