Cause, conseguenze e strategie di mitigazione Proponiamo il primo di una serie di articoli in cui affronteremo l’attuale problema dei mutamenti climatici. Presentiamo il documento redatto, votato e pubblicato dall’Ipcc - Comitato intergovernativo sui cambiamenti climatici - che illustra la sintesi delle ricerche svolte su questo tema rilevante.

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Climate Change 2007: The Physical Science Basis.

On robust estimation of the location parameter

Nature And Properties Of Soils

1. Place animal in induction chamber and anesthetize the mouse and ensure sedation. 2. Once the animal is sedated, move it to a nose cone for hair removal using cream. Only apply cream to the area of the chest that will be utilized for imaging. Once the hair is removed, wipe area with wet gauze to ensure all hair is removed. 3. Move the animal to the imaging platform and tape its paws to the ECG lead plates and insert rectal probe. Body temperature should be maintained at 36-37°C. During imaging, reduce anesthesia to maintain proper heart rate. If the animal shows signs of being awake, use a higher concentration of anesthetic.

人唾液天疱疮抗原的纯化

B6nassy, C., 1955. R6marques sur deux Aphelinid6s: Aphelinus mytilaspidis Le Baron et Aphytis proclia Walker. Annls l~piphyt. 6: 11-17. Lord, F. T. & MacPhee, A. W., 1953. The influence of spray programs on the fauna of apple orchards in Nova Scotia II. Oyster shell scale. Can. Ent. 79: 196-209. Pickett, A. D., 1946. A progress report on long term spray programs. Rep. Nova Scotia Fruit Grow. Ass. 83 : 27-31. Pickett, A. D., 1967. The influence of spray programs on the fauna of apple orchards in Nova Scotia XIV. Can. Ent. 97: 816-821. Tothill, J. D., 1918. The predacious mite Hemisarcoptes malus Shimer and its relation to the natural control of the oyster shell scale Lepidosaphes ulmi L. Agric. Gaz. Can. 5 : 234-239.

http://link.springer.com/content/pdf/10.1007/BF01976688.pdf

Soil enzymes: Kuprevich, V. F. & Shcherbakova, T. A.: Translated from the Russian edition (1966), published by the Indian National Scientific Documentation Centre, New Delhi 1971. 392 pp., offset printing from type script, paper cover. Obtainable from U.S. Department of Commerce, National Technical Information Service, Springfield, Va. 22151

Soil Database of 1:1,000,000 Digital Soil Survey and Reference System of the Chinese Genetic Soil Classification System

Quantification of heavy and trace metal contamination in soil can be arduous, requiring the use of lengthy and intricate extraction procedures which may or may not give reliable results. Of the many procedures in publication, some are designed to operate within specific parameters while others are designed for more broad application. Most procedures have been modified since their inception which creates ambiguity as to which procedure is most acceptable in a given situation. For this study, the Tessier, Community Bureau of Reference (BCR), Short, Galan, and Geological Society of Canada (GCS) procedures were examined to clarify benefits and limitations of each. Modifications of the Tessier, BCR, and GCS procedures were also examined. The efficacy of these procedures is addressed by looking at the soils used in each procedure, the limitations, applications, and future of sequential extraction.

/pdf/heavy-metal-and-trace-metal-analysis-in-soil-by-sequential-u109bns27z.pdf

Heavy metal and trace metal analysis in soil by sequential extraction: a review of procedures.

Contemporary soil, agronomic, and environmental investigations require high quality data for the development of sound management decisions. For years, X-ray fluorescence (XRF) spectrometry has been known to provide accurate elemental data in a wide range of matrices. However, advances in the past two decades have now made the technology portable. Improvements to spectrometer design have led to the replacement of many active source X-ray units with X-ray tubes that only emit X-rays when energized. Several generations of detector improvement have resulted in the current standard for many units, the silicon drift detector, which is capable of much lower limits of detection than its predecessors. Field portable X-ray fluorescence (PXRF) spectrometers offer many advantages over traditional techniques including speed, portability, wide dynamic range of elemental quantification, little/no need for sample pretreatment, and simplicity. Furthermore, PXRF analyses are nondestructive, allowing for analyzed samples to be preserved for future use. This review presents an overview of the development, operational theory, and contemporary uses of PXRF. Also, benefits and limitations to PXRF use are presented. Many industrial uses are covered, but deference is paid to rapidly advancing environmental, pedological, and agronomic applications of PXRF. Summarily, PXRF offers a range of benefits not possible with traditional laboratory techniques.

David C. Weindorf

Papers

Soil Database of 1:1,000,000 Digital Soil Survey and Reference System of the Chinese Genetic Soil Classification System

Heavy metal and trace metal analysis in soil by sequential extraction: a review of procedures.

Advances in Portable X-ray Fluorescence (PXRF) for Environmental, Pedological, and Agronomic Applications

Characterizing soils using a portable X-ray fluorescence spectrometer: 1. Soil texture

Characterizing soils via portable X-ray fluorescence spectrometer: 4. Cation exchange capacity (CEC)