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  • 1
    Online Resource
    Online Resource
    Statistical Methods in Biology : Design and Analysis of Experiments and Regression. (2014)
    Milton :CRC Press LLC,
    Details
    Keywords: Regression analysis. ; Electronic books.
    Description / Table of Contents: Written in simple language with relevant examples, this illustrative introductory book presents best practices in experimental design and simple data analysis. Taking a practical and intuitive approach, it only uses mathematical formulae to formalize the methods where necessary and appropriate. The text features extended discussions of examples that include real data sets arising from research. The authors analyze data in detail to illustrate the use of basic formulae for simple examples while using the GenStat statistical package for more complex examples. Each chapter offers instructions on how to obtain the example analyses in GenStat and R.
    Type of Medium: Online Resource
    Pages: 1 online resource (592 pages)
    Edition: 1st ed.
    ISBN: 9781439898055
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=1644962
    DDC: 570.1/5195;570.15195
    Language: English
    Note: Front Cover -- Contents -- Preface -- Authors -- Chapter 1: Introduction -- Chapter 2: A Review of Basic Statistics -- Chapter 3: Principles for Designing Experiments -- Chapter 4: Models for a Single Factor -- Chapter 5: Checking Model Assumptions -- Chapter 6: Transformations of the Response -- Chapter 7: Models with a Simple Blocking Structure -- Chapter 8: Extracting Information about Treatments -- Chapter 9: Models with More Complex Blocking Structure -- Chapter 10: Replication and Power -- Chapter 11: Dealing with Non-Orthogonality -- Chapter 12: Models for a Single Variate: Simple Linear Regression -- Chapter 13: Checking Model Fit -- Chapter 14: Models for Several Variates: Multiple Linear Regression -- Chapter 15: Models for Variates and Factors -- Chapter 16: Incorporating Structure: Linear Mixed Models -- Chapter 17: Models for Curved Relationships -- Chapter 18: Models for Non-Normal Responses: Generalized Linear Models -- Chapter 19: Practical Design and Data Analysis for Real Studies -- References -- Appendix A: Data Tables -- Appendix B: Quantiles of Statistical Distributions -- Appendix C: Statistical and Mathematical Results -- Back Cover.
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    GEOMAR EBL
  • 2
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    Shift from coral to macroalgae dominance on a volcanically acidified reef (2015)
    PANGAEA
    In:  Supplement to: Enochs, I C; Manzello, Derek P; Donham, E M; Kolodziej, Graham; Okano, R; Johnston, Lyza; Young, Craig S; Iguel, John; Edwards, C B; Fox, M D; Valentino, L; Johnson, Steven; Benavente, D; Clark, S J; Carlton, R; Burton, T; Eynaud, Y; Price, Nichole N (2015): Shift from coral to macroalgae dominance on a volcanically acidified reef. Nature Climate Change, 5(12), 1083-1088, https://doi.org/10.1038/nclimate2758
    Details
    Publication Date: 2024-03-15
    Description: Rising anthropogenic CO2 in the atmosphere is accompanied by an increase in oceanic CO2 and a concomitant decline in seawater pH (ref. 1). This phenomenon, known as ocean acidification (OA), has been experimentally shown to impact the biology and ecology of numerous animals and plants2, most notably those that precipitate calcium carbonate skeletons, such as reef-building corals3. Volcanically acidified water at Maug, Commonwealth of the Northern Mariana Islands (CNMI) is equivalent to near-future predictions for what coral reef ecosystems will experience worldwide due to OA. We provide the first chemical and ecological assessment of this unique site and show that acidification-related stress significantly influences the abundance and diversity of coral reef taxa, leading to the often-predicted shift from a coral to an algae-dominated state4, 5. This study provides field evidence that acidification can lead to macroalgae dominance on reefs.
    Keywords: Alkalinity, total; Aragonite saturation state; Benthos; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; CO2 vent; Coast and continental shelf; Community composition and diversity; Entire community; EXP; Experiment; Field observation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Identification; Individuals; Maug_Island; Name; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Rocky-shore community; Salinity; Site; Temperature, water; Tropical; Type
    Type: Dataset
    Format: text/tab-separated-values, 9300 data points
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    DATA PANGAEA
  • 3
    Electronic Resource
    Electronic Resource
    Second trimester ambulatory blood pressure in nulliparous pregnancy: a useful screening test for pre-eclampsia? (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To assess the effectiveness of second trimester 24-hour ambulatory blood pressure measurement as a screening test for pre-eclampsia.Design Prospective interventional study.Setting John Radcliffe Maternity Hospital, Oxford, and Queen Charlotte's and Chelsea Hospital, London.Subjects One hundred and sixty-two normotensive nulliparous women recruited at hospital booking clinics.Intervention Ambulatory blood pressure was measured at 18 and 28 weeks gestation using the TM2420 monitor.Main outcome measure The development of pre-eclampsia.Results Awake systolic and mean arterial pressures were significantly increased (P〈0.02) at 18 weeks in those who later developed pre-eclampsia. Those differences were more apparent at 28 weeks at which time the diastolic pressure was also increased (P〈0.01). At both stages of gestation the higher readings were sustained during sleep so that the awake-sleep differences were similar in relation to each outcome. The group with incipient pre-eclampsia had a significantly faster heart rate at both 18 and 28 weeks (P〈0.002) The sensitivity in predicting pre-eclampsia for a mean arterial pressure of 85 mmHg or greater at 28 weeks was 65%, with a positive predictive value of 31 %. The sensitivity and positive predictive value for a test combining a mean arterial pressure of 85 mmHg or greater and a heart rate of 90 bpm or greater were 53% and 45%, respectively.Conclusion Although second trimester ambulatory blood pressure is significantly increased in women who later develop pre-eclampsia, the predictive values for blood pressure alone are low. The efficiency of the test is increased by combining the awake ambulatory heart rate and blood pressure measurement together. If an effective method for preventing pre-eclampsia becomes available (commencing at 28 weeks gestation), then awake ambulatory blood pressure and heart rate may have some clinical value as a screening test.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb15106.x
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Estimating Taylor's power law parameters for weeds and the effect of spatial scale (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 36 (1996), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The spatial variability of weeds within fields was studied for six sets of count data. Heterogeneity for a given mean population density was measured using the variance of the counts between sample units at different locations; relatively large values of sample variance imply aggregation. The dependence of variance on mean was measured using the relationship known as Taylor's power law, ubiquitous in animal ecology but seldom used for plant populations. This was fitted to an extensive set of plant counts and 69 estimates of its parameters b, an index of aggregation, and log10a were computed. Estimates were corrected for bias when the number of samples was small. Overall, b varied between 1.32 and 2.61, and log10a varied between -0.85 and 1.58. agreeing well with previous estimates for both plant and animal populations. Parameter estimates varied with sample size and spatial sample scale, but unpredictably. Parameter values when species counts were combined were compared with individual species analyses. Knowledge of the likely range of these parameters for weed populations provides an important basis for future modelling of the relationship between weed density and crop yield loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1996.tb01670.x
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Passive smoking amongst asthmatic children. Questionnaire or objective assessment? (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 24 (1994), S. 0 
    Details
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: An increasing number of studies have implicated passive smoking as a definite threat to non-smokers' health. Self-reports of smoking status may not always be reliable, particularly in situations where the smoker feels under pressure to give up smoking. In this study questionnaire and salivary cotinine, an objective measure of nicotine exposure, were studied in asthmatic and age-matched control children. We have consequently developed a sensitive assay for cotinine using high performance liquid chromatography (HPLC) to quantitate environmental tobacco smoke (ETS) exposure in a group of 5- to 7-year-old asthmatic and control children. We chose to use mixed unstimulated saliva collected by absorption into dental rolls in the mouth for 5 min. Our modified extraction procedure was highly reproducible with a 〉90% retrieval rate of cotinine from spiked saliva. The parents were asked to fill in a questionnaire on atmospheric pollutants to obtain an estimate of declared ETS exposure in the home. Results showed that 31% of the asthmatic patients were exposed to ETS, according to the parents, but by HPLC 69% had been so exposed (n=19). From the control group the figures were 40% and 50% of patients, respectively. Therefore, an objective assessment is essential as ETS is more ubiquitous than is apparent from the questionnaire alone. Finally, in this small number of individuals our objective assessment demonstrates that ETS exposure is more prevalent in asthmatic children (69%) than age-matched controls (51%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2222.1994.tb00231.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Ban on triazine herbicides likely to reduce but not negate relative benefits of GMHT maize cropping (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 428 (2004), S. 313-316 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The UK Farm-Scale Evaluations (FSE) compared the effects on biodiversity of management of genetically modified herbicide-tolerant (GMHT) spring-sown crops with conventional crop management. The FSE reported larger weed abundance under GMHT management for fodder maize, one of three crops ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02374
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The structure of potassium tris(monochloroacetato)stannate(II) (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 2550-2553 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740879009882
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  • 8
    Electronic Resource
    Electronic Resource
    The influence of glucosinolates and sugars on feeding by the cabbage stem flea beetle,Psylliodes chrysocephala (1994)
    Springer
    Entomologia experimentalis et applicata 73 (1994), S. 77-83 
    Details
    ISSN: 1570-7458
    Keywords: Psylliodes chrysocephala ; cabbage stem flea beetle ; oilseed rape ; host plant selection ; glucosinolates ; surgars ; feeding stimulant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Agar was used as an artificial substrate to investigate the feeding behaviour of the cabbage stem flea beetle,Psylliodes chrysocephala L. (Coleoptera: Chrysomelidae), an important pest of winter oilseed rape (Brassica napus) in Europe. Both glucosinolates and sugars stimulated feeding when added to agar. The amount of feeding that occurred was affected by the type and concentration of glucosinolate and surgar and also by combinations of components. Although glucosinolates were potent feeding stimulants forP. chrysocephala, they were not a prerequisite for feeding, nor does it seem likely that glucosinolate profiles are used by this species to discriminate amongst cruciferous plants at the gustatory level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382516
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  • 9
    Electronic Resource
    Electronic Resource
    Sex pheromones in the cereal aphid parasitoidsPraon volucre andAphidius rhopalosiphi (1993)
    Springer
    Entomologia experimentalis et applicata 69 (1993), S. 33-39 
    Details
    ISSN: 1570-7458
    Keywords: Hymenoptera ; Aphidiinae ; aphid ; sex pheromone ; parasitoid ; Praon volucre ; Aphidius rhopalosiphi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory and field experiments provided evidence for the release of sex pheromones by virgin femalePraon volucre Haliday andAphidius rhopalosiphi De Stefani-Perez (Hymenoptera: Braconidae, Aphidiinae). In Petri dish biosassays, rubber or vermiculite models treated with crude virgin female extracts were frequently approached by males and elicited rapid wing-fanning behaviour and copulation attempts. Delta-shaped water traps containing live virgin females caught large numbers of conspecific males when placed in winter wheat crops. Trapping slightly below crop height resulted in higher catches than trapping above the crop canopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380671
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  • 10
    Electronic Resource
    Electronic Resource
    The influence of aphids and honeydew on the leaving rate of searching aphid parasitoids from wheat plants (1992)
    Springer
    Entomologia experimentalis et applicata 63 (1992), S. 259-264 
    Details
    ISSN: 1570-7458
    Keywords: Aphid ; parasitoid ; honeydew ; behaviour ; cereals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dispersal cages were used to investigate the effects of aphids and treatment with artificial honeydew on the leaving rate of searching females of the parasitoid Aphidius rhopalosiphi from groups of wheat plants. Parasitoids which flew away from groups of plants placed in the centre of a cage were trapped on the sides and roof of the cage and thus were prevented from returning to the plants. The positions of trapped parasitoids suggested their direction of flight when dispersing from the plants. Parasitoids increased their residence times on groups of plants in the presence of aphids and of artificial honeydew, but the rate of parasitism of the host Sitobion avenae was not raised by the presence of artificial honeydew under the experimental conditions used. The direction of flight taken by the majority of parasitoids suggested that they were leaving the plants in order to locate further plants nearby to continue searching rather than to terminate searching and disperse away from the area. The need to consider plant patch size in studies of parasitoid searching behaviour is stressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192774
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