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PubMed1999

Feeding preferences of spodoptera exigua in response to form and concentration of selenium

Minimal information is available on the impact of various organic and inorganic forms of the ecologically and agriculturally important pollutant, selenium (Se), on insect herbivores. We conducted bioassays with artificial diet to examine the feeding responses of a generalist herbivore, Spodoptera exigua (Hubner) (Lepidoptera: Noctuidae), to various forms and concentrations of Se. Two different-aged cohorts of larvae were examined in choice tests with control diets vs. test diets incorporating lethal concentrations (LC(10), LC(30), LC(50), and LC(70)) of sodium selenate, sodium selenite, seleno-DL-cystine, and seleno-DL-methionine. Tests initiated with neonates showed larvae significantly preferred control diet over diet with sodium selenate, sodium selenite, or selenocystine, but at most concentrations showed no preference between selenomethionine and control diet. Choice tests initiated with third instars demonstrated a preference for control diet over sodium selenate treatments, and sodium selenite treatments. In contrast, no significant responses were found in tests initiated with third instars offered the choice between selenocystine or selenomethionine and untreated controls. Additionally, comparisons of consumption demonstrated that inorganic selenium compounds were antifeedants whereas the organic selenium compounds tested have little antifeedant activity. The toxicity of all of the tested forms of selenium, in combination with the lack of antifeedant activity of some compounds, has the potential to affect both the distribution and diversity of terrestrial herbivores in both agricultural and natural systems. Arch. Copyright 1999 Wiley-Liss, Inc.

Journal Article↗
PubMed2000

Practice of pediatric pulmonology: results of the Future of Pediatric Education Project (FOPE)

In 1996, the Future of Pediatric Education (FOPE) Project of the American Academy of Pediatrics (AAP) developed surveys to describe the nature of pediatric practices, recent trends in clinical practice, and anticipated workforce needs for both pediatric generalists and pediatric sub-specialists. A survey was specifically developed to describe the features of pediatric pulmonology as self-reported by pediatric pulmonologists. The survey was distributed to members of the AAP Pulmonology Section, the Pediatric Assembly of the American Thoracic Society, and certified pediatric pulmonologists recognized by the American Board of Pediatrics. Of the 535 respondents (67% of those invited to respond), the responses of 388 certified and 94 trained but not board-certified pulmonologists were included in the results. The characteristics of certified and non-certified respondents were the same for most survey questions. Clinical activities occupy 73 +/- 29% of professional time. Most pulmonologists work in urban, inner city, or suburban settings and 85% are affiliated with a medical school. One third are in private practice. As a group, research activities occupy less than 15% of their time. Most pediatric pulmonologists maintain a referral practice and use physician extenders to provide care. Patients with asthma and cystic fibrosis comprise 60-70% of patient volume. Both the volume and complexity of patients are increasing, as is competition for pediatric sub-specialty services. Pediatric pulmonary practices vary in size and in volume of patients that they manage in various settings. Forty percent of respondents identify allergists and other pediatric pulmonologists as sources of competition. Sixty-nine percent of respondents do not believe that there is a current need for additional pediatric pulmonologists in their respective communities. Only 15% of respondents plan to retire in the next decade.

Adult↗
PubMed2000

Digestive proteinase activity in corn earworm (Helicoverpa zea) after molting and in response to lowered redox potential.

Insect digestive proteinases are often strongly influenced by ambient physicochemical conditions, such as pH, ionic strength, and oxidation-reduction potential. Although the effects of the former two parameters are well documented, the influence of redox potential on catalytic rates of digestive enzymes is not well understood. In this study, we manipulated the midgut redox potential of a generalist caterpillar (the corn earworm, Helicoverpa zea) by augmenting artificial diet with dithiothreitol, a powerful thiol reducing agent that lowers the redox potential in the lumen by 40-45 mV. Effects on total proteolytic activity, as well as on elastase, chymotrypsin, trypsin, leucine aminopeptidase, and carboxypeptidase A and B activities were measured using azocasein and nitroanilide model substrates. The profiles of proteinase activities in the epithelium and lumen were also monitored on days 1, 2, and 3 after the molt in penultimate instar larvae. Although the reducing agent strongly inhibited the activity of some proteinases in vitro, ingestion of the reducing diet failed to affect in vivo proteinase activities. There was also no effect on larval relative growth, consumption, or digestive efficiencies. We conclude that dietary reducing agents must lower midgut redox potential to below -40 mV to significantly impact digestive efficiency. Arch.

Animals↗
PubMed1996

Olfactory basis of host location by mosquitoes and other haematophagous Diptera.

The behavioural role of odours released by mosquito hosts is poorly understood, indeed for many species it is still uncertain whether olfactory cues play a significant part in host location. Generalist attractants, such as CO2, have found application in mosquito trapping systems, and yet more host-specific attractants, such as L-lactic acid, remain of questionable value. Recent work with other haematophagous Diptera, notably Glossina, has shown that by a co-ordinated multidisciplinary approach it is possible to develop odour-baited trapping systems with a high level of attractiveness and specificity. Many of the compounds shown to attract Glossina have been tested with mosquitoes, and one of these, 1-octen-3-ol, attracts female mosquitoes of a number of species, but only in the presence of CO2. The behavioural significance of other compounds identified as host attractants of haematophagous Diptera, such as phenols, indoles and carboxylic acids, are currently under investigation. Efforts to produce a host odour attractant for the highly anthropophilic species Anopheles gambiae have been hindered by the chemical nature of the compounds associated with its human host, although a number of short-chain fatty acids identified in sweat samples have been shown to be electrophysiologically active.

Animals↗
PubMed1984

Anthropometry and numerical taxonomy in clinical genetics: an example of applied biological anthropology.

Biological anthropologists can contribute a unique perspective as well as technical expertise to the diagnosis and classification of genetic disorders. Anthropometry has been used with increasing frequency to characterize syndromes and to establish ranges of variation within syndromes. The specific anthropometric-radiologic technique of metacarpophalangeal pattern profile analysis has proven useful in discriminating individuals with the Prader-Labhart-Willi (PLW) syndrome from unaffected persons. Analysis of these data also indicate a negative correlation between age and Z-score transformations of individual hand bone lengths. These findings sound a cautionary note to clinical investigators who would use the Z-score transformation to standardize for age and sex. Problems encountered in the classification of genetic syndromes afford many parallels with those faced by anthropologists in the classification of living and fossil populations. The reliance on "key" traits and the necessity of focusing on pedigree analysis results in a deemphasis of the total range of variation and typological thinking. Application of numerical taxonomic techniques to the classification of the heterogeneous connective tissue disease osteogenesis imperfecta (OI) illustrates the heuristic value of this technique and points out the need to consider phenotypic overlap when defining typologies. Clinical genetics affords just one example of an area in medicine where the unique training and generalist perspective of the biological anthropologist is in demand. The decline in the availability of positions in the traditional academic habitat for biological anthropologists makes it imperative that graduate students be aware of alternatives and that they obtain training in the practical skills which such alternatives will demand.

Anthropology↗
PubMed2006

Inter- and intrahabitat dietary variability of chacma baboons (Papio ursinus) in South African savannas based on fecal delta13C, delta15N, and %N.

Baboons are dietary generalists, consuming a wide range of food items in varying proportions. It is thus difficult to quantify and explain the dietary behavior of these primates. We present stable carbon (delta(13)C) and nitrogen (delta(15)N) isotopic data, and percentage nitrogen (%N), of feces from chacma baboons (Papio ursinus) living in two savanna environments of South Africa: the mountainous Waterberg region and the low-lying Kruger National Park. Baboons living in the more homogeneous landscapes of the Waterberg consume a more isotopically heterogeneous diet than their counterparts living in Kruger Park. Grasses and other C(4)-based foods comprise between approximately 10-20% (on average) of the bulk diet of Kruger Park baboons. Carbon isotopic data from the Waterberg suggest diets of approximately 30-50% grass, which is higher than generally reported for baboons across the African savanna. Based on observations of succulent-feeding, we propose that baboons in the Waterberg consume a mix of C(4) grasses and CAM-photosynthesizing succulents in combined proportions varying between approximately 5-75% (average, approximately 35%). Fecal delta(15)N of baboons is lower than that of sympatric ungulates, which may be due to a combination of low levels of faunivory, foraging on subterranean plant parts, or the use of human foods in the case of Kruger Park populations. Fecal N levels in baboons are consistently higher than those of sympatric ungulate herbivores, indicating that baboons consume a greater proportion of protein-rich foods than do other savanna mammals. These data suggest that chacma baboons adapt their dietary behavior so as to maximize protein intake, regardless of their environment.

Analysis of Variance↗
PubMed2002

Myosin superfamily evolutionary history.

The superfamily of myosin proteins found in eukaryotic cells is known to contain at least 18 different classes. Members are classified based on the phylogenetic analysis of the head domains located at the amino terminus of the polypeptide. While phylogenetic relationships provide insights into the functional relatedness of myosins within and between families, the evolutionary history of the myosin superfamily is not revealed by such studies. In order to establish the evolutionary history of the superfamily, we analyzed the representation of myosin gene families in a range of organisms covering the taxonomic spectrum. The amino acid sequences of 232 myosin heavy chains, as well as 65 organisms representing the protist, plant, and animal kingdoms, were included in this study. A phylogenetic tree of organisms was constructed based on several complementary taxonomic classification schemes. The results of the analysis support an evolutionary hypothesis in which myosins II and I evolved the earliest of all the myosin groups. Myosins V and XI evolved from a common myosin II-like ancestor, but the two families diverged to either the plant (XI) or animal (V) lineage. Class VII myosin appeared fourth among the families, and classes VI and IX appeared later during the early period of metazoan radiation. Myosins III, XV, and XVIII appeared after this group, and X appeared during the formative phases of vertebrate evolution. The remaining members of the myosin superfamily (IV, VI, XII, XIII, XIV, XVI, and XVII) are limited in distribution to one or more groups of organisms. The evolutionary data permits one to predict the likelihood that myosin genes absent from a given species are either missing (not found yet because of insufficient data) or lost due to a mutation that removed the gene from an organism's lineage. In conclusion, an analysis of the evolutionary history of the myosin superfamily suggests that early-appearing myosin families function as generalists, carrying out a number of functions in a variety of cell types, while more recently evolved myosin families function as specialists and are limited to a few organisms or a few cell types within organisms.

Biological Evolution↗
PubMed2005

Carcass analysis to improve a meat-based diet for the artificial rearing of the predatory mirid bug Dicyphus tamaninii.

Improvement of an existing meat-based diet has been obtained for rearing the generalist predator Dicyphus tamaninii (Heteroptera: Miridae). The approach followed, different from the classical addition/deletion method, was performing biochemical analysis of adult carcasses in order to have information about the nutritional status of the predator. Comparison of total, free amino acids and lipid composition of meat-reared and conventionally reared females allowed detecting some nutritional deficiencies. A reformulated diet with new sources of proteins and lipids was tested again with the predator. Some biological parameters of bugs that were inferior in the initial meat diet when compared with those of the conventionally reared insects, such as nymphal development time and fresh weight, have been improved with the reformulated diet.

Amino Acids↗
PubMed2002

Short-term outcomes of acute knee injuries: does the provider make a difference?

OBJECTIVE: To compare the short-term outcomes of acute knee injuries treated by specialists and generalists. METHODS: Using patient logs, 168 adults with acute knee injuries were identified; 131 (78%) completed a questionnaire 3 months after initial presentation. RESULTS: The mean age of the 77 male and 54 female responders was 34.6 years (range 18-73 years). The injuries were classified as mild (n = 35), moderate (n = 75), or severe (n = 21). Most responders were satisfied with their care and outcome, but 22% noted some functional limitations. The 59 patients seeing an orthopedist were more likely to have had a severe injury, more physician visits, activity limitations, lost time from work or recreation, and more pain when compared with the 72 patients who never saw an orthopedist. Excluding surgical patients, however, satisfaction was not significantly different by provider. After multivariate modeling (adjusting for age, sex, injury severity, and diagnosis), there was no significant association between having seen an orthopedist and either treatment success or satisfaction. CONCLUSION: With the exception of time lost for recuperation in our community there is little difference in short-term outcome for patients with acute knee injury not undergoing surgery, regardless of the specialty of the treating physician.

Adolescent↗
PubMed2003

The effects of physician specialty and patient comorbidities on the use and discontinuation of coxibs.

OBJECTIVE: To examine the effects of physician specialty and comorbidities on cyclooxygenase 2-selective nonsteroidal antiinflammatory drugs (NSAIDs; coxibs) utilization. METHODS: Medical records of 452 patients from a regional managed care organization with >/=3 consecutive NSAID prescriptions from June 1998 to April 2001 were abstracted. Multivariable adjusted associations between coxib initiation and discontinuation and patient and provider characteristics were examined. RESULTS: A total of 1,142 NSAID prescriptions were written over 9,398 total patient-months of followup. Compared with patients seeing family or general practitioners, patients seeing rheumatologists (odds ratio [OR] 3.4, 95% confidence interval [95% CI] 2.1-5.7) and internists (OR 2.3, 95% CI 1.5-3.6) were significantly more likely to receive a coxib, as well as patients with a history of osteoarthritis (OR 2.6, 95% CI 1.7-3.8), gastrointestinal disease (OR 2.3, 95% CI 1.2-4.5), and congestive heart failure (OR 4.1, 95% CI 1.0-16.4). Although specialists were more likely than generalists to prescribe coxibs, only family or general practitioners were significantly more likely to selectively use coxibs among their patients with a history of gastrointestinal disease. Fifty-four percent of NSAID prescriptions were discontinued, and coxibs were significantly less likely to be discontinued than were traditional NSAIDs (OR 0.6, 95% CI 0.5-0.8). CONCLUSION: Our findings suggest significantly greater, but perhaps less selective use of coxibs among specialists, even after accounting for important covariates. The initiation and discontinuation of coxibs was influenced by physician specialty and by patient risk factors.

Aged↗
PubMed1985

Referral of musculoskeletal disease patients by family and general practitioners.

We surveyed general and family practitioners to evaluate their patterns of referring musculoskeletal disease patients to rheumatologists and orthopedists. Patients who had rheumatoid arthritis, systemic lupus erythematosus, and ankylosing spondylitis were most often referred to rheumatologists, whereas patients with osteoarthritis, persistent low back pain, and post-traumatic knee pain were most often referred to orthopedists. As conditions worsened in severity, referrals were more frequent. Patients with conditions that were difficult to diagnose, such as possible shoulder tendinitis that was unresponsive to initial nonsteroidal therapy, undiagnosed polyarthritis, and intermittent knee swelling with pain, were most often treated without referral and, when referred, were most often sent to orthopedists. Belief in the effectiveness of rheumatologists or orthopedists correlated strongly with reported referral behavior, yet most respondents considered themselves capable of managing the majority of patients with musculoskeletal diseases. Neither practice arrangement, board certification, nor educational background affected referral behavior. However, younger physicians were more likely (P = 0.002) to refer patients to rheumatologists. Multivariate analysis showed that the significant predictors of global referral behavior were belief in the effectiveness of subspecialists and a small number of musculoskeletal problems seen by the generalist. The predictors of referral to rheumatologists were belief in rheumatologist efficacy and young physician age.

Adult↗
PubMed1998

Arthritis health service utilization among the elderly: the role of urban-rural residence and other utilization factors.

OBJECTIVE: To compare the impact of urban-rural residence and other factors on the utilization of any type of arthritis-related physician care and on rheumatologist utilization. METHODS: A population-based random sample of adults 65 years of age or older with self-reported arthritis from 10 urban and 12 rural Iowa counties were surveyed by telephone interview. We estimated the arthritis prevalence and health service utilization in this sample and evaluated the effects of predisposing, enabling, and need factors on utilization and satisfaction. Health care utilization was defined as ever having visited specific types of providers for arthritis-related care. RESULTS: A total of 488 individuals participated: 227 from urban counties and 261 rural respondents. Urban respondents more commonly reported having received a diagnosis of osteoarthritis from their physicians but were less likely to report rheumatoid arthritis. A greater proportion of urban versus rural respondents had utilized any physician for arthritis care (50.7% versus 41.0%, P = 0.032) and had more often seen an orthopedist (18.1% versus 9.6%, P = 0.006) or general internist (18.5% versus 8.8%, P = 0.002). A diagnosis of rheumatoid arthritis, younger age, living with another person, higher income, and further distance from an arthritis provider were significantly associated with prior rheumatologist utilization. The strongest adjusted predictor of any physician visit for arthritis care was whether older adults drove themselves to their provider. For rheumatologist utilization, a diagnosis of rheumatoid arthritis and age were independently associated. CONCLUSIONS: The most striking finding was the consistent association of need factors (such as the desire for medical advice), joint swelling, and the presence of a diagnosis of rheumatoid arthritis with physician utilization. We identified significant urban-rural variations in factors both enabling and predisposing to arthritis care, although urban-rural status did not appear to independently influence arthritis physician utilization. In a rural state with a relatively small number of rheumatologists, deleterious enabling factors such as greater distance from the doctor and lack of supplemental insurance did not provide significant obstacles to either rheumatologist or generalist utilization.

Aged↗
PubMed2006

Effectiveness of the primary therapist model for rheumatoid arthritis rehabilitation: a randomized controlled trial.

OBJECTIVE: To compare the primary therapist model (PTM), provided by a single rheumatology-trained primary therapist, with the traditional treatment model (TTM), provided by a physical therapy (PT) and/or occupational therapy (OT) generalist, for treating patients with rheumatoid arthritis (RA). METHODS: Eligible patients were adults requiring rehabilitation treatment who had not received PT/OT in the past 2 years. Participants were randomized to the PTM or TTM group. The primary outcome was defined as the proportion of clinical responders who experienced a > or =20% improvement in 2 of the following measures from baseline to 6 months: Health Assessment Questionnaire, pain visual analog scale, and Arthritis Community Research and Evaluation Unit RA Knowledge Questionnaire. RESULTS: Of 144 consenting patients, 33 (10 PTM participants, 23 TTM participants) dropped out without completing any followup assessment, leaving 111 for analysis (63 PTM participants, 48 TTM participants). The majority were women (PTM 87.3%, TTM 79.2%), with a mean age of 54.2 years and 56.8 years for the PTM and TTM groups, respectively. Average disease duration was 10.6 years and 13.2 years for each group, respectively. At 6 months, 44.4% of patients in the PTM group were clinical responders versus 18.8% in the TTM group (chi(2) = 8.09, P = 0.004). CONCLUSION: Compared with the TTM, the PTM was associated with better outcomes in patients with RA. The results, however, should be interpreted with caution due to the high dropout rate in the TTM group.

Adult↗
PubMed2007

Non-genomic transgenerational inheritance of disease risk.

That there is a heritable or familial component of susceptibility to chronic non-communicable diseases such as type 2 diabetes, obesity and cardiovascular disease is well established, but there is increasing evidence that some elements of such heritability are transmitted non-genomically and that the processes whereby environmental influences act during early development to shape disease risk in later life can have effects beyond a single generation. Such heritability may operate through epigenetic mechanisms involving regulation of either imprinted or non-imprinted genes but also through broader mechanisms related to parental physiology or behaviour. We review evidence and potential mechanisms for non-genomic transgenerational inheritance of 'lifestyle' disease and propose that the 'developmental origins of disease' phenomenon is a maladaptive consequence of an ancestral mechanism of developmental plasticity that may have had adaptive value in the evolution of generalist species such as Homo sapiens.

Animals↗
PubMed2004

Interobserver variability in the pathological assessment of malignant colorectal polyps.

BACKGROUND: Treatment of patients with malignant large bowel polyps is highly dependent on pathological evaluation. The aim of this study was to evaluate interobserver variability in the pathological assessment of endoscopically removed polyps. METHODS: The records of 88 patients with colorectal cancer who underwent endoscopic removal of malignant polyps were reviewed. Study investigators reviewed the initial pathology report; three experienced gastrointestinal pathologists reviewed all slides in a blinded fashion. Interobserver variability of pathological assessment of malignant polyps was analysed by kappa statistics. RESULTS: Seventy-six (86 per cent) of the 88 patients had malignant polyps and 12 (14 per cent) had carcinoma in situ. Agreement between experienced pathologists was substantial with regard to T stage (kappa = 0.725), resection margin status (kappa = 0.668) and Haggitt's classification (kappa = 0.682), but comparison of initial and experienced pathologists' assessment demonstrated only moderate agreement in these areas (kappa = 0.516, kappa = 0.555 and kappa = 0.578 respectively). Agreement between even experienced pathologists was poor with respect to histological grade of differentiated adenocarcinomas (kappa = 0.163) and angiolymphatic vessel invasion (kappa = - 0.017). CONCLUSION: Pathological assessment of malignant polyps varies between observers. Specialist pathologists appear to have a higher degree of consensus among themselves than with generalist pathologists with respect to T stage. The high interobserver variability with regard to histological grade of differentiated tumours is clinically irrelevant. However, variability in the assessment of angiolymphatic vessel invasion limits the value of this measurement for clinical decision making.

Adult↗
PubMed2005

Data mining and enantiophore studies on chiral stationary phases used in HPLC separation.

ChirBase database has been employed to mine the chemical structures of compounds resolved on common commercial chiral stationary phases (CSP). Different data sets were produced. The molecular fingerprint (enantiophore) strategy was then applied over these data sets. Enantiophores are identified by analyzing and mapping the three-dimensional common structural features shared by the ligand molecules imported from ChirBase. Such lists of encoded ligand enantiophores allowed us to generate 3D maps of the molecular interacting fragments, which are supposed to act reciprocally with each CSP. Results show that each CSP is combined with different preferential enantiophore counterparts in the ligand. These differences may be well related to the particular behavior of a given CSP to separate different families of compounds. As expected, supramolecular cellulosic or amylosic CSPs show generalist behavior by resolving a wide range of racemates. On the other hand, molecular CSPs based on a well-defined chiral receptor (such as Whelk-O1 or Chirobiotic T) appear to be more specific and thus specially adapted for more restrictive families of compounds. In addition, enantiophore analyses confirm that the supramolecular CSPs can combine multiple potential binding sites and so offer numerous enantioselective mechanisms toward a ligand. Inversely, on molecular CSPs, the ligand must respect strict geometrical constraints to make possible the chiral discrimination. Additional applications of the methodology are discussed as well.

Journal Article↗
PubMed1983

Invariance and sex-specific variations of the glomerular organization in the antennal lobes of a moth, Mamestra brassicae, and a butterfly, Pieris brassicae.

The glomerular organization of the antennal lobes was analyzed in the moth Mamestra brassicae and comparatively in the butterfly Pieris brassicae. The invariance of the lobes in number, position, and size of the glomeruli was verified quantitatively in the moth for all the glomeruli in individuals of the same sex (67 in males, 68 in females) and for 56 sex-invariant glomeruli which can be identified in all individuals whatever their sex. In the butterfly, the positional variability is greater than in the moth and hinders identification. The most conspicuous sex-variant glomeruli are two adjoining macroglomeruli in the male moth which have homologs of very small size in the female. No such dimorphism was observed in Pieris, a species in which males are attracted to female by visual stimuli and not by a sex pheromone as in Mamestra. There are other sex-variant glomeruli in Mamestra: four varying in location, three subdivided in the female, two found only in the male, and three found only in the female. Consequently, differing olfactory sensitivity related to species and sex could correlate with detectable modifications in the glomerular organization. A hypothesis on the function of glomeruli is discussed in which most of the glomeruli are viewed as "olfactory generalists" giving rise collectively to proposed "across-glomeruli patterns."

Animals↗
PubMed2026

Panmixia in a Widespread Butterfly: High Dispersal and Ecological Generalism Buffer Against Landscape Fragmentation.

Habitat fragmentation is widely expected to reduce population connectivity and increase genetic differentiation, although the strength of these effects depends on species-specific traits such as dispersal ability. Here, we investigated the population genetic structure of the cosmopolitan butterfly, Pieris rapae L. (Lepidoptera: Pieridae), across western Germany using genome-wide single-nucleotide polymorphism (SNP) data. To analyze the effects of landscape structure on genetic connectivity, we applied a paired study design comprising four landscape pairs, each consisting of a highly intensified, modern agricultural landscape and a more heterogeneous, traditional landscape. Our results revealed no evidence of genetic differentiation. Pairwise FST values were close to zero; we detected no isolation by distance, and clustering analyses supported a single genetic population. No meaningful associations between genetic variation and environmental variables were detected, with landscape effects explaining less than 0.4% of genomic variation. Consequently, we found no evidence for stronger genetic structuring in modern compared to more connected traditional landscapes. Our results suggest that extensive habitat fragmentation does not necessarily translate into reduced genetic connectivity in highly mobile, generalist species. In P. rapae , high dispersal ability and ecological generalism appear to buffer against the genetic consequences of landscape modification, resulting in panmictic population structure even across strongly contrasting agricultural landscapes.

Pieris rapae↗