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1. A rapid, efficient method for the bioassay of extracts, fractions and compounds for activity against tropical aphids

Author:
Heller, M.V.,   et al.   ; Quiros, D.I.; Emmen, D.A.; Dominguez, E.; Coley, P.D.; Kursar, T.A.;     Show all 6 Authors
Source:
International journal of pest management 2006 v.52 no.4 pp. 333-342
ISSN:
0967-0874
Subject:
Aphis gossypii; Aphis craccivora; insect control; plant extracts; secondary metabolites; plant proteins; insecticidal properties; bioassays; rapid methods; toxicity testing; dietary exposure; mortality; botanical insecticides
DOI:
10.1080/09670870600847525

2. Inventorying and Monitoring Wetland Condition and Restoration Potential on a Watershed Basis with Examples from Spring Creek Watershed, Pennsylvania, USA

Author:
Wardrop, Denice Heller,   et al.   ; Brooks, Robert P.; Cole, Charles Andrew;     Show all 3 Authors
Source:
Environmental management 2006 v.38 no.4 pp. 673-687
ISSN:
0364-152X
Subject:
data collection; monitoring; remote sensing; resource management; sampling; streams; watersheds; wetlands; Pennsylvania
Abstract:
... We developed an approach for inventorying wetland resources, assessing their condition, and determining restoration potential in a watershed context. This article outlines how this approach can be developed into a Wetland Monitoring Matrix (WMM) that can help resource management agencies make regulatory and nonregulatory decisions. The WMM can be embedded in a standard planning process (Wetlands, ...
DOI:
10.1007/s00267-004-0389-y
PubMed:
16841177

3. Seasonal spatial dynamics and causes of nest movement in colonies of the invasive Argentine ant (Linepithema humile)

Author:
HELLER, NICOLE E.,   et al.   ; GORDON, DEBORAH M.;     Show all 2 Author
Source:
Ecological entomology 2006 v.31 no.5 pp. 499-510
ISSN:
0307-6946
Subject:
insect colonies; Linepithema humile; nesting sites; migratory behavior; spatial distribution; microclimate; humidity; food availability; seasonal variation; invasive species; insect nests; California
Abstract:
... 1. Colony organisation and movement behaviour of the Argentine ant (Linepithema humile) was studied over 3 years in field populations in California and in captive colonies in the laboratory. This invasive species is highly polydomous and unicolonial; colonies consist of expansive and fluid networks of nests and trails. The spatial and temporal organisation of colonies may contribute to ecological ...
DOI:
10.1111/j.1365-2311.2006.00806.x

4. Chromoplast Morphology and β-Carotene Accumulation during Postharvest Ripening of Mango Cv. 'Tommy Atkins'

Author:
Heller, A.,   et al.   ; Vasquez-Caicedo, A.L.; Neidhart, S.; Carle, R.;     Show all 4 Authors
Source:
Journal of agricultural and food chemistry 2006 v.54 no.16 pp. 5769-5776
ISSN:
0021-8561
Subject:
mangoes; postharvest physiology; ripening; beta-carotene; fruit composition; biosynthesis; chromoplasts; ultrastructure; isomerization; isomers; carrots
Abstract:
... Accumulation of β-carotene and trans-cis isomerization of ripening mango mesocarp were investigated as to concomitant ultrastructural changes. Proceeding postharvest ripening was shown by relevant starch degradation, tissue softening, and a rising sugar/acid ratio, resulting in a linear decrease (R2 = 0.89) of a ripening index (RPI(KS)) with increasing ripening time. A modest accumulation of all-t ...
DOI:
10.1021/jf060747u

5. Bovine kidney tissue/biological fluid correlation for penicillin

Author:
HELLER, D.,   et al.   ; CHIESA, O.A.; VON BREDOW, J.; SMITH, M.; CONDON, R.; THOMAS, M.H.;     Show all 6 Authors
Source:
Journal of veterinary pharmacology and therapeutics 2006 v.29 no.4 pp. 299-306
ISSN:
0140-7783
Subject:
blood; cattle diseases; slaughter; drug therapy; urine; blood chemistry; food contamination; penicillins; tissue analysis; rapid methods; steers; antibiotic residues; kidneys; screening; pharmacokinetics; infection
Abstract:
... Penicillin is one of the most commonly misused drugs in steers and dairy cows. In the US, at slaughter the tolerance is 50 ng/g in kidney and other edible tissues. If the tolerance is exceeded, the carcass may not be used for human food. A preslaughter test for penicillin in an easily accessible biological fluid is needed to predict if the concentration of penicillin is below tolerance in the kidn ...
DOI:
10.1111/j.1365-2885.2006.00747.x
PubMed:
16846467

6. Early Commitment of Financial Aid Eligibility

Author:
Heller, Donald E.
Source:
TheAmerican behavioral scientist 2006 v.49 no.12 pp. 1719-1738
ISSN:
0002-7642
Subject:
students; United States
Abstract:
... Under the current financial aid system in the United States, most students do not find out the amount of financial aid for which they qualify until after they have applied to college and been admitted. There is evidence that for low-income students, this is too late in the college access and choice process. This article explores the feasibility and challenges of making commitments of financial aid ...
DOI:
10.1177/0002764206289136

7. Environmental and developmental effects on the biosynthesis of UV-B screening pigments in Scots pine (Pinus sylvestris L.) needles

Author:
HELLER, WERNER,   et al.   ; KAFFARNIK, FLORIAN; SEIDLITZ, HARALD K.; OBERMAIER, JOSEF; SANDERMANN, HEINRICH JR.;     Show all 5 Authors
Source:
Plant, cell and environment 2006 v.29 no.8 pp. 1484-1491
ISSN:
0140-7791
Subject:
Pinus sylvestris; acylation; biosynthesis; cell walls; coumaric acids; environmental factors; enzyme activity; flavonols; hydroxycinnamoyltransferase; irradiation; screening; seedlings; ultraviolet radiation
Abstract:
... The major UV-B screening pigments of the epidermal layer of Scots pine (Pinus sylvestris) needles are flavonol 3-o-glycosides (F3Gs) esterified with hydroxycinnamic acids at positions 3'' and 6''. Acylation is the last step in biosynthesis and is catalysed by position-specific hydroxycinnamoyl transferases (3'' and 6''HCT). The UV-B dependence of these enzyme activities was studied in primary need ...
DOI:
10.1111/j.1365-3040.2006.01518.x
PubMed:
16898012

8. Development of Multiclass Methods for Drug Residues in Eggs: Hydrophilic Solid-Phase Extraction Cleanup and Liquid Chromatography/Tandem Mass Spectrometry Analysis of Tetracycline, Fluoroquinolone, Sulfonamide, and β-Lactam Residues

Author:
Heller, D.N.,   et al.   ; Nochetto, C.B.; Rummel, N.G.; Thomas, M.H.;     Show all 4 Authors
Source:
Journal of agricultural and food chemistry 2006 v.54 no.15 pp. 5267-5278
ISSN:
0021-8561
Subject:
tetracyclines; beta-lactam antibiotics; sulfonamides; food contamination; mass spectrometry; multiresidue analysis; antibiotic residues; liquid chromatography; eggs; solid phase extraction; quinolones
Abstract:
... A method was developed for detection of a variety of polar drug residues in eggs via liquid chromatography/tandem mass spectrometry (LC/MS/MS) with electrospray ionization (ESI). A total of twenty-nine target analytes from four drug classes-sulfonamides, tetracyclines, fluoroquinolones, and β-lactams-were extracted from eggs using a hydrophilic-lipophilic balance polymer solid-phase extraction (SP ...
DOI:
10.1021/jf0605502

9. Microbial Colonization of Beech and Spruce Litter--Influence of Decomposition Site and Plant Litter Species on the Diversity of Microbial Community

Author:
Heller, Werner,   et al.   ; Aneja, Manish Kumar; Sharma, Shilpi; Fleischmann, Frank; Stich, Susanne; Bahnweg, Günther; Munch, Jean Charles; Schloter, Michael;     Show all 8 Authors
Source:
Microbial ecology 2006 v.52 no.1 pp. 127-135
ISSN:
0095-3628
Subject:
Ascomycota; Basidiomycota; Glomeromycota; Picea; Zygomycota; bacterial communities; bags; clones; community development; denaturing gradient gel electrophoresis; lignin; microbial colonization; mixed forests; plant litter; ribosomal RNA; species diversity; starch; sugars
Abstract:
... The present study was conducted to investigate the effect of decomposition site and plant litter species on the colonizing microbial communities. For this, litter bag technique using beech and spruce litter was combined with RNA-based fingerprinting and cloning. Litter bags were incubated for 2 and 8 weeks in the Ah horizon of beech and beech-spruce mixed forest sites. Although sugars and starch w ...
DOI:
10.1007/s00248-006-9006-3
PubMed:
16691328

10. Immunization of Sows in an Integrated Pig-breeding Herd using a Homologous Inactivated Salmonella Vaccine Decreases the Prevalence of Salmonella typhimurium Infection in the Offspring

Author:
Heller, P.,   et al.   ; Roesler, U.; Waldmann, K.-H.; Truyen, U.; Hensel, A.;     Show all 5 Authors
Source:
Journal of veterinary medicine. Series B. 2006 v.53 no.5 pp. 224-228
ISSN:
0931-1793
Subject:
Salmonella Typhimurium; antibiotics; antibodies; enrofloxacin; enzyme-linked immunosorbent assay; feces; herds; immunoglobulin G; piglets; progeny; sows; suckling; vaccination; vaccines; weaning
Abstract:
... The efficacy of a homologous vaccination in preventing infection of suckling piglets with Salmonella (S.) Typhimurium was evaluated after an immunization of pregnant sows using an inactivated herd-specific S. Typhimurium vaccine. Twenty-five pregnant sows were vaccinated three times antepartum. The efficiency of this vaccine regime was assessed by comparison with a control group of 37 sows and the ...
DOI:
10.1111/j.1439-0450.2006.00951.x

11. Anuric renal failure in a dog after Red-bellied Black snake (Pseudechis porphyriacus) envenomation

Author:
Heller, J.,   et al.   ; Bosward, K.L.; Hodgson, D.R.; Pottie, R.;     Show all 4 Authors
Source:
Australian veterinary journal 2006 v.84 no.5 pp. 158-162
ISSN:
0005-0423
Subject:
dogs; pets; snakes; snake bites; venoms; poisoning; case studies; hemolytic anemia; hemolysis; renal failure; signs and symptoms (animals and humans); antivenoms; erythrocytes; therapeutics; necrosis
DOI:
10.1111/j.1751-0813.2006.tb12769.x
PubMed:
16739524

12. Weakly Antimalarial Flavonol Arabinofuranosides from Calycolpus warszewiczianus

Author:
Heller, M.V.,   et al.   ; Torres-Mendoza, D.; González, J.; Ortega-Barría, E.; Capson, T.L.; McPhail, K.; Gerwick, W.H.; Cubilla-Rios, L.;     Show all 8 Authors
Source:
Journal of natural products 2006 v.69 no.5 pp. 826-828
ISSN:
0163-3864
Subject:
Myrtaceae; flavonols; antimalarials; chemical structure; spectral analysis; Plasmodium falciparum; Leishmania mexicana; Trypanosoma cruzi; human health; Panama
DOI:
10.1021/np050484i
PubMed:
16724851

13. Linking Temporal and Spatial Scales in the Study of an Argentine Ant Invasion

Author:
Heller, N.E.,   et al.   ; Sanders, N.J.; Gordon, D.M.;     Show all 3 Authors
Source:
Biological invasions 2006 v.8 no.3 pp. 501-507
ISSN:
1387-3547
Subject:
insect colonies; Linepithema humile; spatial distribution; seasonal variation; population genetics; spatial variation; nesting; invasive species; ecological invasion; insect nests; California
DOI:
10.1007/s10530-005-6411-3

14. Use of tissue-fluid correlations to estimate gentamicin residues in kidney tissue of Holstein steers

Author:
Heller, D.,   et al.   ; Chiesa, O.A.; Von Bredow, J.; Nochetto, C.; Smith, M.; Moulton, K.; Thomas, M.;     Show all 7 Authors
Source:
Journal of veterinary pharmacology and therapeutics 2006 v.29 no.2 pp. 99-106
ISSN:
0140-7783
Subject:
animal tissues; tissue analysis; correlation; estimation; pharmacokinetics; gentamicin; antibiotic residues; kidneys; Holstein; screening; steers; drug excretion
Abstract:
... Gentamicin continues to be one of the most effective antibiotics for the treatment of gram-negative infections. Greater than 90% of the drug is rapidly eliminated from the body in <2 days, however, a small residue remains bound to the kidney cortex tissue for many months. In beef steers, the gentamicin residue is unacceptable and its presence is monitored by the FAST (Fast Antimicrobial Screen Tes ...
DOI:
10.1111/j.1365-2885.2006.00720.x
PubMed:
16515663