THE U.S. DAIRY INDUSTRY

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Evidence for O-atom exchange in the O(^1D) + N_2O reaction as the source of mass-independent isotopic fractionation in atmospheric N_2O

Recent experiments have shown that in the oxygen isotopic exchange reaction for O(^1D) + CO_2 the elastic channel is approximately 50% that of the inelastic channel [Perri et al., 2003]. We propose an analogous oxygen atom exchange reaction for the isoelectronic O(^1D) + N_2O system to explain the mass-independent isotopic fractionation (MIF) in atmospheric N_2O. We apply quantum chemical methods to compute the energetics of the potential energy surfaces on which the O(^1D) + N_2O reaction occurs. Preliminary modeling results indicate that oxygen isotopic exchange via O(^1D) + N_2O can account for the MIF oxygen anomaly if the oxygen atom isotopic exchange rate is 30–50% that of the total rate for the reactive channels

Reply to comment by Röckmann and Kaiser on "Evidence for O-atom exchange in the O(^1D) + N_2O reaction as the source of mass-independent isotopic fractionation in atmospheric N_2O"

Based upon the authors’ questioning of the existence of the C_(2v) intermediate, we have reviewed our evidence for the existence of this state. It now appears that this state was in fact an artifact of our calculation [Yung et al., 2004], and was a saddle point rather than a true minimum. Our desire to provide a timely response to this criticism has kept us from determining exactly what minimum structure will be obtained by a full minimization at the level of theory employed. However, it is clear that the C_(2v) symmetry of the compound is broken in such a way that the two N-O bonds are no longer equivalent. We are grateful to the authors for helping us resolve this issue

More than BRIC-a-Brac: Testing Chinese Exceptionalism in Patenting Behavior Using Comparative Empirical Analysis

Although many developing economies are increasingly influencing the global economy, China’s influence has been the greatest of these by far. Once hindered from competition by political and economic restrictions, China is now a major economic player. As China’s economic might has grown, so too has the demand for intellectual property protection for technologies originating from China. In this article, we present a detailed empirical study of Chinese patenting trends in the United States and the implications of these trends for the global economy. We compare these trends to patenting trends from earlier decades. Specifically, we compare Chinese patenting trends to Japan, South Korea, Brazil, Russia, and India. We study how patent allowance rates for Chinese patent applications at the United States Patent and Trademark Office have improved, and how these allowance rates compare to allowance rates in earlier “boom” periods from other East Asian countries. While many believe that China is an exception in many respects, we find that patents for innovations originating from China seem to track a well-trodden path laid down by countries like South Korea in earlier decades. As a historical matter, we show empirically that China’s patenting trend is not unique. It is instead strikingly similar to the patenting trends of other Far East Asian countries whose inventors have applied for patents in the United States. In other words, Chinese innovation is moving up the value chain in product development much like other Far East Asian countries have done in the past. We also find that China appears to be setting itself apart from other BRICS (Brazil, Russia, India, China, and South Africa) countries in successfully seeking patent protection for technological innovation and in producing products with higher levels of technological sophistication and innovation. Our empirical results can be largely explained by four factors. First, our work underscores the role of foreign direct investments by multinational corporations in China; foreign direct investments are a major factor driving U.S. patent filings from China. Second, Chinese government policies have promoted patent protection and aligned Chinese patent office procedures with the procedures of the U.S. Patent and Trademark Office. Third, investment in research and development in China by both domestic and foreign entities has increased significantly. Fourth, the Chinese government has committed to moving up the value chain in products and services

Radio Variability of Radio Quiet and Radio Loud Quasars

The majority of quasars are weak in their radio emission, with flux densities comparable to those in the optical, and energies far lower. A small fraction, about 10%, are hundreds to thousands of times stronger in the radio. Conventional wisdom holds that there are two classes of quasars, the radio quiets and radio louds, with a deficit of sources having intermediate power. Are there really two separate populations, and if so, is the physics of the radio emission fundamentally different between them? This paper addresses the second question, through a study of radio variability across the full range of radio power, from quiet to loud. The basic findings are that the root mean square amplitude of variability is independent of radio luminosity or radio-to-optical flux density ratio, and that fractionally large variations can occur on timescales of months or less in both radio quiet and radio loud quasars. Combining this with similarities in other indicators, such as radio spectral index and the presence of VLBI-scale components, leads to the suggestion that the physics of radio emission in the inner regions of all quasars is essentially the same, involving a compact, partially opaque core together with a beamed jet.Comment: 32 pages, 9 figures. Astrophysical Journal, in pres

Sulphur-isotope compositions of pig tissues from a controlled feeding study

Sulphur-isotope determinations are becoming increasingly useful for palaeodietary reconstruction, but knowledge of isotopic discrimination between diet and various tissues remains inadequate. In this study, we explore the sensitivity of δ34Stissue values to changes in δ34Sdiet values, sulphur isotopic discrimination between diet and consumer, and the potential impact of terrestrial vs. marine protein consumption on these discrimination offsets. We present new δ34S values of bone collagen, muscle, liver, hair, milk and faeces from ten mature sows, ten piglets and fifteen adolescent pigs from a controlled feeding study. The δ34Stissue values were found to co-vary with the δ34Sdiet values, the δ34Stissue – δ34Sdiet isotopic offsets (Δ34Stissue-diet) are small but consistent, and dietary protein source does not systematically alter the Δ34Stissue-diet isotopic discrimination. The outcomes of this study are of particular relevance to questions that are difficult to resolve using carbon and nitrogen stable isotopes alone, and will also be useful in regions where terrestrial, freshwater, and marine resources could have all potentially contributed to human diet

More than BRIC-a-Brac: Testing Chinese Exceptionalism in Patenting Behavior Using Comparative Empirical Analysis

Although many developing economies are increasingly influencing the global economy, China’s influence has been the greatest of these by far. Once hindered from competition by political and economic restrictions, China is now a major economic player. As China’s economic might has grown, so too has the demand for intellectual property protection for technologies originating from China. In this article, we present a detailed empirical study of Chinese patenting trends in the United States and the implications of these trends for the global economy. We compare these trends to patenting trends from earlier decades. Specifically, we compare Chinese patenting trends to Japan, South Korea, Brazil, Russia, and India. We study how patent allowance rates for Chinese patent applications at the United States Patent and Trademark Office have improved, and how these allowance rates compare to allowance rates in earlier “boom” periods from other East Asian countries. While many believe that China is an exception in many respects, we find that patents for innovations originating from China seem to track a well-trodden path laid down by countries like South Korea in earlier decades. As a historical matter, we show empirically that China’s patenting trend is not unique. It is instead strikingly similar to the patenting trends of other Far East Asian countries whose inventors have applied for patents in the United States. In other words, Chinese innovation is moving up the value chain in product development much like other Far East Asian countries have done in the past. We also find that China appears to be setting itself apart from other BRICS (Brazil, Russia, India, China, and South Africa) countries in successfully seeking patent protection for technological innovation and in producing products with higher levels of technological sophistication and innovation. Our empirical results can be largely explained by four factors. First, our work underscores the role of foreign direct investments by multinational corporations in China; foreign direct investments are a major factor driving U.S. patent filings from China. Second, Chinese government policies have promoted patent protection and aligned Chinese patent office procedures with the procedures of the U.S. Patent and Trademark Office. Third, investment in research and development in China by both domestic and foreign entities has increased significantly. Fourth, the Chinese government has committed to moving up the value chain in products and services