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202 records – page 1 of 21.

A 300-million-year record of atmospheric carbon dioxide from fossil plant cuticles.

https://arctichealth.org/en/permalink/ahliterature95961
Source
Nature. 2001 May 17;411(6835):287-90
Publication Type
Article
Date
May-17-2001
Author
Retallack G J
Author Affiliation
Department of Geological Sciences, University of Oregon, Eugene 97403-1272, USA. gregr@darkwing.uoregon.edu
Source
Nature. 2001 May 17;411(6835):287-90
Date
May-17-2001
Language
English
Publication Type
Article
Keywords
Atmosphere - chemistry
Carbon Dioxide - metabolism
Cold Climate
Fossils
Ginkgo biloba - cytology - growth & development - metabolism
Greenhouse Effect
Ice
Methane - metabolism
Phylogeny
Plant Leaves - cytology - growth & development - metabolism
Plants, Medicinal
Pollen
Seasons
Water - metabolism
Abstract
To understand better the link between atmospheric CO2 concentrations and climate over geological time, records of past CO2 are reconstructed from geochemical proxies. Although these records have provided us with a broad picture of CO2 variation throughout the Phanerozoic eon (the past 544 Myr), inconsistencies and gaps remain that still need to be resolved. Here I present a continuous 300-Myr record of stomatal abundance from fossil leaves of four genera of plants that are closely related to the present-day Ginkgo tree. Using the known relationship between leaf stomatal abundance and growing season CO2 concentrations, I reconstruct past atmospheric CO2 concentrations. For the past 300 Myr, only two intervals of low CO2 (2,000 p.p.m.v.) concentrations. These results are consistent with some reconstructions of past CO2 (refs 1, 2) and palaeotemperature records, but suggest that CO2 reconstructions based on carbon isotope proxies may be compromised by episodic outbursts of isotopically light methane. These results support the role of water vapour, methane and CO2 in greenhouse climate warming over the past 300 Myr.
Notes
Comment In: Nature. 2001 May 17;411(6835):247-811357108
PubMed ID
11357126 View in PubMed
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A 700-year paleoecological record of boreal ecosystem responses to climatic variation from Alaska.

https://arctichealth.org/en/permalink/ahliterature85780
Source
Ecology. 2008 Mar;89(3):729-43
Publication Type
Article
Date
Mar-2008
Author
Tinner Willy
Bigler Christian
Gedye Sharon
Gregory-Eaves Irene
Jones Richard T
Kaltenrieder Petra
Krähenbühl Urs
Hu Feng Sheng
Author Affiliation
Institute of Plant Sciences and Oeschger Center for Climate Change Research, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland. willy.tinner@ips.unibe.ch
Source
Ecology. 2008 Mar;89(3):729-43
Date
Mar-2008
Language
English
Publication Type
Article
Keywords
Alaska
Climate
Diatoms
Ecosystem
Fires
Forestry
Fossils
Geologic sediments
Greenhouse Effect
Ice Cover
Plant Physiology
Pollen
Time Factors
Trees
Abstract
Recent observations and model simulations have highlighted the sensitivity of the forest-tundra ecotone to climatic forcing. In contrast, paleoecological studies have not provided evidence of tree-line fluctuations in response to Holocene climatic changes in Alaska, suggesting that the forest-tundra boundary in certain areas may be relatively stable at multicentennial to millennial time scales. We conducted a multiproxy study of sediment cores from an Alaskan lake near the altitudinal limits of key boreal-forest species. Paleoecological data were compared with independent climatic reconstructions to assess ecosystem responses of the forest tundra boundary to Little Ice Age (LIA) climatic fluctuations. Pollen, diatom, charcoal, macrofossil, and magnetic analyses provide the first continuous record of vegetation fire-climate interactions at decadal to centennial time scales during the past 700 years from southern Alaska. Boreal-forest diebacks characterized by declines of Picea mariana, P. glauca, and tree Betula occurred during the LIA (AD 1500-1800), whereas shrubs (Alnus viridis, Betula glandulosa/nana) and herbaceous taxa (Epilobium, Aconitum) expanded. Marked increases in charcoal abundance and changes in magnetic properties suggest increases in fire importance and soil erosion during the same period. In addition, the conspicuous reduction or disappearance of certain aquatic (e.g., Isoetes, Nuphar, Pediastrum) and wetland (Sphagnum) plants and major shifts in diatom assemblages suggest pronounced lake-level fluctuations and rapid ecosystem reorganization in response to LIA climatic deterioration. Our results imply that temperature shifts of 1-2 degrees C, when accompanied by major changes in moisture balance, can greatly alter high-altitudinal terrestrial, wetland, and aquatic ecosystems, including conversion between boreal-forest tree line and tundra. The climatic and ecosystem variations in our study area appear to be coherent with changes in solar irradiance, suggesting that changes in solar activity contributed to the environmental instability of the past 700 years.
PubMed ID
18459336 View in PubMed
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4200 years of pine-dominated upland forest dynamics in west-central Mexico: human or natural legacy?

https://arctichealth.org/en/permalink/ahliterature155658
Source
Ecology. 2008 Jul;89(7):1893-907
Publication Type
Article
Date
Jul-2008
Author
Blanca L Figueroa-Rangel
Katherine J Willis
Miguel Olvera-Vargas
Author Affiliation
Oxford Long-term Ecology Laboratory, Oxford University Centre for the Environment, School of Geography, South Parks Road, Oxford, OX1 3QY, United Kingdom. bfrangel@cucsur.udg.mx
Source
Ecology. 2008 Jul;89(7):1893-907
Date
Jul-2008
Language
English
Publication Type
Article
Keywords
Climate
Ecosystem
Fossils
Human Activities
Humans
Mexico
Paleontology
Pinus - physiology
Pollen
Population Dynamics
Soil
Time Factors
Trees - physiology
Abstract
The pine-dominated forests of west-central Mexico are internationally recognized for their high biodiversity, and some areas are protected through various conservation measures including prohibition of human activity. In this region, however, there is evidence for human settlement dating back to ca. AD 1200. It is therefore unclear whether the present forest composition and structure are part of a successional stage following use by indigenous human populations during the past, or due to natural processes, such as climate. We present a study reconstructing the vegetation dynamics of pine-dominated forest over the past 4200 years using paleoecological techniques. Results from fossil pollen and charcoal indicate that, in this region, pine-dominated forests are the native vegetation type and not anthropogenically derived secondary succession. The predominant driving mechanism for the expansion of pine-dominated forest appears to be intervals of aridity and naturally induced burning. A close association is noted between pine abundance and longer-term climatic trends, including intervals of aridity between ca. 4200 and 2500, 1200 and 850, and 500 and 200 cal yr BP and shorter-term trends. Evident periodicity occurs in pine and Poaceae abundance every 80 years. These short-term quasi-periodic oscillations have been recorded in a number of lake and ocean sediments in Mexico and are thought to be linked to solar forcing resulting in drought cycles that occur at approximately the same time intervals.
PubMed ID
18705376 View in PubMed
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[About Minimization of Expenses on Allergy Diagnosis in Children: Analysis of Consistency of in Vitro- and in Vivo-Allergic Examinations Results].

https://arctichealth.org/en/permalink/ahliterature272621
Source
Vestn Ross Akad Med Nauk. 2015;(6):748-55
Publication Type
Article
Date
2015
Author
M A Snovskaya
A S Batyrova
L S Namazova-Baranova
A A Alekseeva
E A Vishneva
O V Kozhevnikova
A A Marushina
V N Lubov
Source
Vestn Ross Akad Med Nauk. 2015;(6):748-55
Date
2015
Language
Russian
Publication Type
Article
Keywords
Adolescent
Allergens - classification - immunology
Child
Child, Preschool
Cost Savings - methods
Dermatitis, Atopic - blood - diagnosis - economics - etiology
Female
Humans
Immunoglobulin E - analysis - blood
Immunologic Techniques - economics - methods
Male
Needs Assessment
Pollen - classification - immunology
Rhinitis, Allergic, Seasonal - blood - diagnosis - economics - etiology
Russia
Abstract
High morbidity rate of atopic diseases among children, including high importance of grass pollen as a sensitizing agent, determine the relevance ofstudies on diagnostic examination systems for appointment of adequate therapy. The research of the most relevant allergens for patients to excludeof duplicating and uninformative tests became urgent after development of a new type of diagnostic tests that does not require expensive equipment. The objective of this research was to evaluate the results of in vitro- and in vivo-diagnostic examinations of children with various forms of atopic disease caused by pollen of meadow grasses, and to choose the most significant prognostic parameters for the diagnosis.
277 children aged 4-16 years with various forms of atopic disease were included in the study. There were performed skin prick tests and determination of IgE-antibodies levels to allergen extracts of cocksfoot (g3), meadow fescue (g4), timothy grass (g6).
In the studied group of patients 32-50% of children have antibodies to grass allergens. There was a close correlation of antibody response on the investigated allergens, quantitative coincidence of IgE-antibodies to g3 andg4 allergens levels. IgE (g6) concentration was close to the IgE(g3) and IgE(g4) levels (85.0 ± 21.6%). Analysis of the skin tests results showed that 44% of patients have a positive response to grass allergens, and in vivo-tests results coincide with serologicaltests results, mostly in a qualitative sense. The most significant relationship was noted between in vivo and in vitro-tests in the results of testing the response to meadow fescue pollen.
Based on these data IgE concentration index to meadow fescue allergens can be used as a prognostic marker to determine the sensitization of patients with different nosology forms of allergy and can help to improve allergic diagnostics.
PubMed ID
27093804 View in PubMed
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[A cytogenetic assessment of the mutagenic background in the Dnieper River industrial area]

https://arctichealth.org/en/permalink/ahliterature35173
Source
Tsitol Genet. 1995 Sep-Oct;29(5):16-22
Publication Type
Article
Author
A I Gorovaia
V M Digurko
T V Skvortsova
Source
Tsitol Genet. 1995 Sep-Oct;29(5):16-22
Language
Russian
Publication Type
Article
Keywords
Child
Child, Preschool
Chromosome Aberrations - genetics
Comparative Study
English Abstract
Environmental monitoring
Environmental Pollution - adverse effects - statistics & numerical data
Humans
Industry
Mutagenesis
Plants - genetics
Pollen - genetics
Ukraine
Abstract
Cytogenetic investigation of plant cells and somatic cells of children from Dnepropetrovsk shown and increase of the frequency of chromosome aberrations and gene mutations in contaminated regions that testified the increased mutagenic background of urban environment.
PubMed ID
8721840 View in PubMed
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Aeroallergen analyses and their clinical relevance. II. Sampling by high-volume airsampler with immunochemical quantification versus Burkard pollen trap sampling with morphologic quantification.

https://arctichealth.org/en/permalink/ahliterature222940
Source
Allergy. 1992 Oct;47(5):510-6
Publication Type
Article
Date
Oct-1992
Author
C R Johnsen
E R Weeke
J. Nielsen
J. Jensen
H. Mosbech
L. Frølund
F. Madsen
L K Poulsen
Author Affiliation
Laboratory of Medical Allergology, National University Hospital, Copenhagen, Denmark.
Source
Allergy. 1992 Oct;47(5):510-6
Date
Oct-1992
Language
English
Publication Type
Article
Keywords
Air Pollutants - analysis
Allergens - analysis
Denmark
Environmental Monitoring - methods
Humans
Hypersensitivity - diagnosis - immunology
Immunochemistry
Poaceae - immunology
Pollen - immunology
Radioallergosorbent Test
Spores
Trees - immunology
Abstract
A comparison was made between the amount of airborne pollen collected by Burkard airsampler and the allergenic activity of particles trapped on glass fibre filters in an Accu-Vol high-volume airsampler. The comparison was made throughout the pollen seasons 1986 to 1989. Both airsamplers were operated 24 h a day. They were placed less than 5 m apart, and estimation of the pollen amount was made on a day-to-day basis during the pollen seasons, and on a weekly basis outside the seasons. The occurrence of the 3 clinically most important allergenic types of pollen, birch, grass, and mugwort, was analysed, and close correlations between the 2 sampling techniques were found (rs 0.5-0.8, p
PubMed ID
1485654 View in PubMed
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Source
Ugeskr Laeger. 2009 Oct 26;171(44):3168-71
Publication Type
Article
Date
Oct-26-2009
Author
Loft Steffen
Author Affiliation
Institut for Folkesundhedsvidenskab, Afdeling for Miljø og Sundhed, Det Sundhedsvidenskabelige Fakultet, Københavns Universitet, Øster Farimagsgade 5, DK-1014 København K, Denmark. s.loft@pubhealth.ku.dk
Source
Ugeskr Laeger. 2009 Oct 26;171(44):3168-71
Date
Oct-26-2009
Language
Danish
Publication Type
Article
Keywords
Air Pollution - adverse effects - analysis - prevention & control
Air Pollution, Indoor - adverse effects - analysis - prevention & control
Animals
Cattle
Climate
Greenhouse Effect
Health
Humans
Methane - analysis
Ozone - analysis
Particulate Matter - analysis
Pollen
Risk factors
World Health
Abstract
Air quality, health and climate change are closely connected. Ozone depends on temperature and the greenhouse gas methane from cattle and biomass. Pollen presence depends on temperature and CO2. The effect of climate change on particulate air pollution is complex, but the likely net effect is greater health risks. Reduction of greenhouse-gas emissions by reduced livestock production and use of combustion for energy production, transport and heating will also improve air quality. Energy savings in buildings and use of CO2 neutral fuels should not deteriorate indoor and outdoor air quality.
PubMed ID
19857393 View in PubMed
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Allergen cross-reactivity between proteins of the latex from Hevea brasiliensis, seeds and pollen of Ricinus communis, and pollen of Mercurialis annua, members of the Euphorbiaceae family.

https://arctichealth.org/en/permalink/ahliterature190257
Source
Allergy Asthma Proc. 2002 Mar-Apr;23(2):141-7
Publication Type
Article
Author
Timo Palosuo
Raphaël C Panzani
Anand B Singh
Renato Ariano
Harri Alenius
Kristiina Turjanmaa
Author Affiliation
National Public Health Institute, Mannerheimintie 166, FIN-00300 Helsinki, Finland.
Source
Allergy Asthma Proc. 2002 Mar-Apr;23(2):141-7
Language
English
Publication Type
Article
Keywords
Adolescent
Adult
Aged
Allergens - immunology - pharmacology
Child
Euphorbiaceae - adverse effects - immunology
Female
Finland
Hevea - adverse effects - immunology
Humans
Latex Hypersensitivity - etiology - immunology
Male
Middle Aged
Plant Proteins - adverse effects - immunology - pharmacology
Pollen - adverse effects - immunology
Ricin - adverse effects - immunology - pharmacology
Seeds - adverse effects - immunology
Abstract
Allergen cross-reactions among three strongly sensitizing Euphorbiaceae species, i.e., the rubber tree (Hevea brasiliensis), castor bean (Ricinus communis), and the Mediterranean weed Mercurialis annua were studied in Finnish patients (n = 25) allergic to natural rubber latex (NRL), but with no known exposure to castor bean or M. annua, and French patients allergic to castor bean (n = 26) or to M. annua (n = 9), but not to NRL. In immunoglobulin E (IgE)-immunoblotting, 28% of NRL-allergic patient sera recognized castor bean seed and 48% reacted to castor bean pollen proteins. Likewise, 35% of the NRL-allergic patient sera bound to M. annua pollen allergens. Nineteen percent of castor bean-allergic patients showed IgE to NRL and 8% to M. annua proteins. Sera from patients allergic to M. annua reacted in 44% to NRL, in 56% to castor bean seed, and in 78% to castor bean pollen proteins. In immunoblotting, castor bean seed extract inhibited the binding of NRL-reactive IgE to 20 kDa, 30 kDa of NRL, and 55 kDa of proteins; NRL extract, in turn, inhibited the binding of castor bean-reactive IgE to 14, 21-22, 29, and 32-34 kDa of castor bean proteins. In ELISA inhibition, NRL extract inhibited 33% of the binding of M. annua--reactive IgE of pooled sera to M. annua pollen. In conclusion, allergen cross-reactivity in vitro was observed among three botanically related Euphorbiaceae members, H. brasiliensis, R. communis, and M. annua, but the molecular specificity of the observed cross-reactions as well as their clinical significance remains to be elucidated. Allergen cross-reactivity should be taken into account in diagnostic work.
PubMed ID
12001793 View in PubMed
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[Allergen-free wards in the treatment of pollinoses and bronchial asthma].

https://arctichealth.org/en/permalink/ahliterature237700
Source
Ter Arkh. 1986;58(4):49-52
Publication Type
Article
Date
1986
Author
Iu A Poroshina
P M Basmanov
S G Gubankova
Iu N Ivanov
O I Belostotskaia
Source
Ter Arkh. 1986;58(4):49-52
Date
1986
Language
Russian
Publication Type
Article
Keywords
Air Conditioning - instrumentation - methods
Allergy and immunology
Asthma - therapy
Conjunctivitis, Allergic - therapy
Dust - adverse effects
Equipment Design
Filtration - instrumentation
Humans
Male
Middle Aged
Moscow
Pollen
Respiratory Care Units - organization & administration
Rhinitis, Allergic, Seasonal - therapy
Abstract
Two allergen-free wards (AFW) fitted out with Academician I. V. Petryanov's filters have been in operation in the Department of General Allergy of the Institute of Immunology, USSR Ministry of Health, since 1981. A high AFW efficacy was shown during treatment without drugs of pollinosis patients with grave manifestations in the pollination season and patients with atopic bronchial asthma outside the season of plant pollination. Since 1981 treatment in AFW has been provided to 232 patients, of them in 104 with a good effect in the season of plant pollination.
PubMed ID
3715757 View in PubMed
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Allergenic airborne pollen and spore research in Alaska and adjacent Canada

https://arctichealth.org/en/permalink/ahliterature76544
Source
Pages 96-102 in R. Fortuine, ed. Circumpolar Health 84. Proceedings of the International Symposium on Circumpolar Health, 6th, Anchorage, 13-18 May, 1984. University of Washington Press, Seattle. 1985.
Publication Type
Article
Date
1985
Circumpolar Health 84:96-102 ALLERGENIC AIRBORNE POLLEN AND SPORE RESEARCH IN ALASKA AND ADJACENT CANADA JAMES H. ANDERSON INTRODUCTION Many people in Alaska and adjacent Canada suffer from the seasonal allergy commonly known as hay fever caused by anti- genic proteins in airborne po 11
  1 document  
Author
Anderson, J. H.
Author Affiliation
Institute of Arctic Biology, University of Alaska, Fairbanks, Alaska
Source
Pages 96-102 in R. Fortuine, ed. Circumpolar Health 84. Proceedings of the International Symposium on Circumpolar Health, 6th, Anchorage, 13-18 May, 1984. University of Washington Press, Seattle. 1985.
Date
1985
Geographic Location
Canada
U.S.
Publication Type
Article
Digital File Format
Text - PDF
Physical Holding
Alaska Medical Library
Keywords
Aeroallergens
Aeroflora
Aeropalynology
Anchorage
Burkard volumetric sampler
Fairbanks
Hay fever
Juneau
Palmer
Pollen allergies
Pollen calendar
Spore allergies
Whitehorse
Documents
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202 records – page 1 of 21.