Comparison of spatial distribution models to predict subtidal burying habitat of the forage fish Ammodytes personatus in the Strait of Georgia,British Columbia,Canada     

Clifford L.K. Robinson  Beatrice Proudfoot  Christopher N. Rooper  Douglas F. Bertram 《水产资源保护:海洋与淡水生态系统》2021,31(10):2855-2869

1. The Pacific sand lance (Ammodytes personatus) is a key forage species for many commercially important fish (e.g. salmon and groundfish), marine birds, and whales found in nearshore coastal waters of British Columbia, Canada.
2. Sand lance lack a swim bladder and have a requirement for low-silt, medium-coarse sandy sea-bed habitat for burying. Little information is available describing the distribution of burying habitat, partly because there are no commercial fisheries for A. personatus in British Columbia.
3. This information is required by habitat and wildlife managers to identify and protect uncommon patches of burying habitats from detrimental activities, including dredging, infilling, and oil spills.
4. In this study, habitat distribution results from five suitability modelling algorithms were evaluated: maximum entropy, generalized linear model, generalized additive model, random forest, and an ensemble model of the latter three.
5. The maximum entropy model had the highest performance score (area under the receiver operator characteristic curve was 0.78) and was selected as the model that most accurately identified the presence of suitable A. personatus burying habitat.
6. Model results indicate that suitable burying habitat is primarily influenced by derived sea-bed substrate, distance to estuary, distance to sand-gravel beaches, and bottom sea temperature.
7. Overall, the spatial modelling identified only 105 km² of highly suitable sand lance burying habitat, or 2.6% of the study area (0–150 m), primarily in Haro Strait, along the east coast of Vancouver Island, and in northern regions of the strait near Cortes, Savary, and Harwood islands.
8. Identification of this uncommon and patchy burying habitat will contribute to the ongoing conservation of an important coastal prey species.

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Introduction: The MIRAB model in the twenty‐first century     

Geoff Bertram 《Asia Pacific viewpoint》2006,47(1):1-13

Abstract: The papers collected in this volume were originally presented at a conference in February 2004, on the theme ‘Beyond MIRAB: The Political Economy of Small Islands in the Twenty‐First Century’. Several of the papers in the collection point towards the emergence of a new three‐way taxonomy of small‐island socioeconomic formations, comprising MIRAB, PROFIT and SITE ideal‐types. The key economic flows in the first are remittances and aid; in the second, jurisdictionally‐related flows such as tax‐haven and money‐laundering transactions; and in the third, tourism revenues. All three ideal‐types correspond to potentially sustainable temporary equilibria, but in all cases the existing set‐up is path‐dependent, and subject to regime switch if disturbed. Conceptualisation of the small‐island world as a field of multiple equilibria and path dependence points to the future importance of event studies by island researchers. The collection includes also new research on the theory of remittances, and case studies of the MIRAB process and the transnational migrant diaspora.  相似文献   

Michael Lipton,Why People Stay Poor: A Study of Urban Bias in World Development,Temple Smith,London, and Australian National University Press,Canberra, 1977, 467 pp.     

I. G. Bertram 《Asia Pacific viewpoint》1977,18(2):221-224

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New Thinking on the Peruvian Highland Peasantry     

I. G. Bertram 《Asia Pacific viewpoint》1974,15(2):89-110

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A Study on Thought of Tea of Hanjae Yi-mok＇s Da-bu     

HC Lee  WS Jang 《茶叶》2013,(4):528-531

The Da-bu of Hanjae Lee mok （1471-1498） is known as an original masterpiece,which is predominantly documented in Korean tea books.He had always spared no effort to put Confucianists＇ theories and thoughts into practice during his 28-year career.Da-bu tea magnificently reflected his concepts of Confucianism in conjunction with tea-drinking activities.The main contents of Da-bu have included written authors,tea species and production,landscape of tea cultivation,tea plants and leaves,ways of tea-drinking and three-grade tea,tea song of seven cups,5 merits and 6 moralities of tea,benefits of tea-drinking,tea comprehension,etc.According to the views of contents,tea of Hanjae Leemok is the only partner with which we can share life and it can also be beneficial to healthy diets.Not only does it have become part of our daily life,but also be a medicine for our physical and mental disease.He composed the tea song of seven cups,which sufficiently expressed a real practice of the pursued ideal state of Confucianism and Taoism.He also promoted a drinking tea for health enrichment of Confucianists.According to the analytical results of Da-bu,Hanjae＇s tea has recognizably become the personally real practice of Confucianism and state.He had reached the enlightenment for the state of birth and death.After consuming tea,his body and mind immediately changed to the state of joys and wonderland,and also he illustrated that this feeling is not a one-off state,it always comes out whenever drinking.Therefore,based on Hanjae Lee mok,tea drinking is not only the regiment for healthy benefits,but also it is a training method,＂ Dado in My Heart＂,for individuals to train their mind,body,and morality.  相似文献   

Direct measurements of the convective recycling of the upper troposphere     

Bertram TH  Perring AE  Wooldridge PJ  Crounse JD  Kwan AJ  Wennberg PO  Scheuer E  Dibb J  Avery M  Sachse G  Vay SA  Crawford JH  McNaughton CS  Clarke A  Pickering KE  Fuelberg H  Huey G  Blake DR  Singh HB  Hall SR  Shetter RE  Fried A  Heikes BG  Cohen RC 《Science (New York, N.Y.)》2007,315(5813):816-820

We present a statistical representation of the aggregate effects of deep convection on the chemistry and dynamics of the upper troposphere (UT) based on direct aircraft observations of the chemical composition of the UT over the eastern United States and Canada during summer. These measurements provide unique observational constraints on the chemistry occurring downwind of convection and the rate at which air in the UT is recycled. These results provide quantitative measures that can be used to evaluate global climate and chemistry models.  相似文献   

Proton nuclear magnetic resonance spectroscopy based investigation on propylene glycol toxicosis in a Holstein cow     

Hanne Christine Bertram  Bent Ole Petersen  Jens ? Duus  Mogens Larsen  Birgitte-Marie L Raun  Niels Bastian Kristensen 《Acta veterinaria Scandinavica》2009,51(1):25

Background

It is unknown which metabolites are responsible for propylene glycol (PG)-induced toxicosis, and a better understanding of the underlying mechanisms explaining incidences of abnormal behaviour of dairy cows fed PG is therefore needed.

Methods

The study included three cows of which one developed PG toxicosis. In order to investigate how the metabolism of PG differed in the cow developing toxicosis, proton nuclear magnetic resonance (NMR) spectroscopy was applied on ruminal fluids and blood plasma samples obtained before and after feeding with PG.

Results

PG toxicosis was characterized by dyspnea and ruminal atony upon intake of concentrate containing PG. The oxygen saturation of arterial blood haemoglobin and the oxygen pressure in arterial blood decreased along with the appearance of the clinical symptoms. NMR revealed differences in plasma and ruminal content of several metabolites between the cow responding abnormally to PG and the two control cows.

Conclusion

It is concluded that PG-toxicosis is likely caused by pulmonary vasoconstriction, but no unusual metabolites directly related to induction of this condition could be detected in the plasma or the ruminal fluid.  相似文献   

Does oxidation affect the water functionality of myofibrillar proteins?     

Bertram HC  Kristensen M  Østdal H  Baron CP  Young JF  Andersen HJ 《Journal of agricultural and food chemistry》2007,55(6):2342-2348

Water-binding properties of myofibrils extracted from porcine muscle, and added hemoglobin with and without exposure to H2O2, were characterized using low-field proton NMR T2 relaxometry. The effects of pH and ionic strength in the samples were investigated as pH was adjusted to 5.4, 6.2, and 7.0 and ionic strength was adjusted to 0.29, 0.46, and 0.71 M, respectively. The formation of dityrosine as a measure of oxidative protein cross-linking revealed a significant increase in dityrosine concentrations upon H2O2 activation. The formation of dityrosine was strongly pH-dependent and increased with decreasing pH. In addition, increased levels of thiobarbituric acid reactive substances were observed upon addition of H2O2, implying that lipid oxidation was enhanced, however, with a different oxidation pattern as compared to the myofibrillar proteins. Low-field NMR relaxation measurements revealed reduced T2 relaxation times upon H2O2 activation, which corresponds to reduced water-holding capacity upon oxidation. However, a direct relationship between degree of oxidation and T2 relaxation time was not observed with various pH values and ionic strengths, and further studies are needed for a complete understanding of the effect of oxidation on myofibrillar functionality.  相似文献   

Identification of allyl esters in garlic cheese     

Herbrand K  Hammerschmidt FJ  Brennecke S  Liebig M  Lösing G  Schmidt CO  Gatfield I  Krammer G  Bertram HJ 《Journal of agricultural and food chemistry》2007,55(19):7874-7878

This study describes the identification of six allyl esters in a garlic cheese preparation and in a commercial cream cheese. The extracts were prepared by liquid/liquid extraction and concentrated by the SAFE process. The identification of the allyl esters of acetic, butyric, hexanoic, heptanoic, octanoic, and decanoic acids is based on the correlation of their mass spectrometric data and chromatographic retention time data obtained from the extracts with those of authentic standards. In addition to the gas chromatography (GC)/mass spectrometry analysis, the flavor ingredients were characterized by GC sniffing by a trained flavorist. Some of the esters were isolated by preparative GC.  相似文献   

PrPSc spreading patterns in the brain of sheep linked to different prion types     

Wemheuer WM  Benestad SL  Wrede A  Wemheuer WE  Brenig B  Bratberg B  Schulz-Schaeffer WJ 《Veterinary research》2011,42(1):32

ABSTRACT: Scrapie in sheep and goats has been known for more than 250 years and belongs nowadays to the so-called prion diseases that also include e.g. bovine spongiform encephalopathy in cattle (BSE) and Creutzfeldt-Jakob disease in humans. According to the prion hypothesis, the pathological isoform (PrPSc) of the cellular prion protein (PrPc) comprises the essential, if not exclusive, component of the transmissible agent. Currently, two types of scrapie disease are known - classical and atypical/Nor98 scrapie. In the present study we examine 24 cases of classical and 25 cases of atypical/Nor98 scrapie with the sensitive PET blot method and validate the results with conventional immunohistochemistry. The sequential detection of PrPSc aggregates in the CNS of classical scrapie sheep implies that after neuroinvasion a spread from spinal cord and obex to the cerebellum, diencephalon and frontal cortex via the rostral brainstem takes place. We categorize the spread of PrPSc into four stages: the CNS entry stage, the brainstem stage, the cruciate sulcus stage and finally the basal ganglia stage. Such a sequential development of PrPSc was not detectable upon analysis of the present atypical/Nor98 scrapie cases. PrPSc distribution in one case of atypical/Nor98 scrapie in a presumably early disease phase suggests that the spread of PrPSc aggregates starts in the di- or telencephalon. In addition to the spontaneous generation of PrPSc, an uptake of the infectious agent into the brain, that bypasses the brainstem and starts its accumulation in the thalamus, needs to be taken into consideration for atypical/Nor98 scrapie.  相似文献