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  • Chemistry  (1,702)
  • General Chemistry  (616)
  • Cell & Developmental Biology  (104)
  • Climate change  (17)
  • Ecology
  • 2020-2023  (19)
  • 1935-1939  (1,806)
  • 2020  (19)
  • 1937  (1,806)
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  • 1
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    Improving estimation of woody aboveground biomass in drylands by accounting for disturbances and spatial heterogeneity (2020)
    CRC/TRR228 Database (TRR228DB)
    Details
    Publication Date: 2022-01-04
    Description: Abstract
    Description: Existing methodologies for estimating woody aboveground biomass and carbon stored therein have been developed for forests but are not tailored to the vast dryland ecosystems where vegetation is heterogenous and highly disturbed. Still, those methods are widely applied with questionable results and possible problematic implications, not only for biomass quantification but also for disturbance ecology, biodiversity research, and ecosystem service assessments. We hereby propose a new methodology especially designed to encompass small, disturbed, and irregular woody growth while keeping sampling effort within reasonable limits. Meaningful demographic growth classes are deployed which enable a stratified sampling design and structure a practicable workflow for integration of different allometric models. To account for the high natural and anthropogenic disturbance levels typically shaping dryland vegetation, our method incorporates a detailed damage assessment by harnessing the ecological archive contained in trees. This allows for quantification of biomass losses to certain disturbance agents, uncovers interactive effects between disturbance agents, and enables assessing the impact of disturbance regime shifts. Extrapolation of biomass losses to stand or landscape level also greatly improves the usual reference state comparison approach. Here, we review the problems of conventional methodologies being applied to drylands, develop and present the improved method proposed by us, and perform a formal method comparison between the two. Results indicate that the conventional allometric method is systematically underestimating biomass and carbon storage in disturbed dryland ecosystems. The bias is highest where general biomass density is lowest and disturbance impacts are severest. Damage assessment demonstrates a dependency between main disturbance agents (elephants and fire) while generally biomass is decreased by increasing elephant densities. The method proposed by us is more time consuming than a conventional allometric approach, yet it can cover sufficient areas within reasonable timespans. Consequent higher data accuracy with concomitant applicability to a wider range of research questions are worth the effort. The proposed method can easily be attuned to other ecosystems or research questions, and elements of it may be adapted to fit alternative sampling schemes.
    Description: Other
    Description: This article is a preprint and has not been certified by peer review. The finally published paper can be accessed at: https://doi.org/10.1016/j.ecolind.2021.108466
    Keywords: Ecology ; Biota ; Biomass ; Carbon ; Carbon Storage Dynamics ; Conservation Areas ; Ecology ; Ecosystem ; National Park ; Vegetation ; Vegetation Structure ; Wildlife
    Type: Text , Text
    Format: PDF
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  • 2
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    Dataset on conservation with elevated elephant densities sequesters carbon in soils despite losses of woody biomass (2020)
    CRC/TRR228 Database (TRR228DB)
    Details
    Publication Date: 2022-03-09
    Description: Abstract
    Description: Nature conservation and restoration in terrestrial ecosystems is often focused on increasing the numbers of megafauna, expecting them to have positive impacts on ecological self-regulation processes and biodiversity. In sub-Saharan Africa, conservation efforts also aspire to protect and enhance biodiversity with particular focus on elephants. However, elephant browsing carries the risk of woody biomass losses. In this context, little is known about how increasing elephant numbers affects carbon stocks in soils, including the subsoils. We hypothesized that (1) increasing numbers of elephants reduce tree biomass, and thus the amount of C stored therein, resulting (2) in a loss of soil organic carbon (SOC). If true, a negative carbon footprint could limit the sustainability of elephant conservation from a global carbon perspective. To test these hypotheses, we selected plots of low, medium, and high elephant densities in two national parks and adjacent conservancies in the Namibian component of the Kavango Zambezi Transfrontier Area (KAZA), and quantified carbon storage in both woody vegetation and soils (1 m). Analyses were supplemented by the assessment of soil carbon isotopic composition. We found that increasing elephant densities resulted in a loss of tree carbon storage by 6.4 t ha−1. However, and in contrast to our second hypothesis, SOC stocks increased by 4.7 t ha−1 with increasing elephant densities. These higher SOC stocks were mainly found in the topsoil (0–30 cm) and were largely due to the formation of SOC from woody biomass. A second carbon input source into the soils was megaherbivore dung, which contributed with 0.02–0.323 t C ha−1 year−1 to ecosystem carbon storage in the low and high elephant density plots, respectively. Consequently, increasing elephant density does not necessarily lead to a negative C footprint, as soil carbon sequestration and transient C storage in dung almost compensate for losses in tree biomass.The dataset contains the raw data of soil analyses up to 1 m soil depth and vegetation data on plot level. A third sheet of the excelfile contains necessary information about abbreviations used within the dataset.
    Keywords: Ecology ; Environment ; Carbon ; Soil Organic Carbon ; Conservation Areas ; Ecosystem ; Vegetation
    Type: Dataset , Dataset
    Format: MS Excel
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  • 3
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    Importance of Orography for Greenland cloud and melt response to atmospheric blocking (2020)
    American Meteorological Society
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Hahn, L. C., Storelvmo, T., Hofer, S., Parfitt, R., & Ummenhofer, C. C. Importance of Orography for Greenland cloud and melt response to atmospheric blocking. Journal of Climate, 33(10), (2020): 4187-4206, doi:10.1175/JCLI-D-19-0527.1.
    Description: More frequent high pressure conditions associated with atmospheric blocking episodes over Greenland in recent decades have been suggested to enhance melt through large-scale subsidence and cloud dissipation, which allows more solar radiation to reach the ice sheet surface. Here we investigate mechanisms linking high pressure circulation anomalies to Greenland cloud changes and resulting cloud radiative effects, with a focus on the previously neglected role of topography. Using reanalysis and satellite data in addition to a regional climate model, we show that anticyclonic circulation anomalies over Greenland during recent extreme blocking summers produce cloud changes dependent on orographic lift and descent. The resulting increased cloud cover over northern Greenland promotes surface longwave warming, while reduced cloud cover in southern and marginal Greenland favors surface shortwave warming. Comparison with an idealized model simulation with flattened topography reveals that orographic effects were necessary to produce area-averaged decreasing cloud cover since the mid-1990s and the extreme melt observed in the summer of 2012. This demonstrates a key role for Greenland topography in mediating the cloud and melt response to large-scale circulation variability. These results suggest that future melt will depend on the pattern of circulation anomalies as well as the shape of the Greenland Ice Sheet.
    Description: This research was supported by the Woods Hole Oceanographic Institution Summer Student Fellow program, by the U.S. National Science Foundation under AGS-1355339 to C.C.U., and by the European Research Council through Grant 758005.
    Keywords: Ice sheets ; Blocking ; Cloud cover ; Topographic effects ; Climate change ; Climate variability
    Repository Name: Woods Hole Open Access Server
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  • 4
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    Analysis of the Beaufort Gyre freshwater content in 2003-2018 (2020)
    American Geophysical Union
    Details
    Publication Date: 2022-10-26
    Description: © The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Proshutinsky, A., Krishfield, R., Toole, J. M., Timmermans, M-L., Williams, W. J., Zimmermann, S., Yamamoto-Kawai, M., Armitage, T. W. K., Dukhovskoy, D., Golubeva, E., Manucharyan, G. E., Platov, G., Watanabe, E., Kikuchi, T., Nishino, S., Itoh, M., Kang, S-H., Cho, K-H., Tateyama, K., & Zhao, J. Analysis of the Beaufort Gyre freshwater content in 2003-2018. Journal of Geophysical Research-Oceans, 124(12), (2019): 9658-9689, doi:10.1029/2019JC015281.
    Description: Hydrographic data collected from research cruises, bottom‐anchored moorings, drifting Ice‐Tethered Profilers, and satellite altimetry in the Beaufort Gyre region of the Arctic Ocean document an increase of more than 6,400 km3 of liquid freshwater content from 2003 to 2018: a 40% growth relative to the climatology of the 1970s. This fresh water accumulation is shown to result from persistent anticyclonic atmospheric wind forcing (1997–2018) accompanied by sea ice melt, a wind‐forced redirection of Mackenzie River discharge from predominantly eastward to westward flow, and a contribution of low salinity waters of Pacific Ocean origin via Bering Strait. Despite significant uncertainties in the different observations, this study has demonstrated the synergistic value of having multiple diverse datasets to obtain a more comprehensive understanding of Beaufort Gyre freshwater content variability. For example, Beaufort Gyre Observational System (BGOS) surveys clearly show the interannual increase in freshwater content, but without satellite or Ice‐Tethered Profiler measurements, it is not possible to resolve the seasonal cycle of freshwater content, which in fact is larger than the year‐to‐year variability, or the more subtle interannual variations.
    Description: National Science Foundation. Grant Numbers: PLR‐1302884,OPP‐1719280, and OPP‐1845877, PLR‐1303644 and OPP‐1756100, OPP‐1756100, PLR‐1303644, OPP‐1845877, OPP‐1719280, PLR‐1302884 Key Program of National Natural Science Foundation of China. Grant Number: 41330960 Global Change Research Program of China. Grant Number: 2015CB953900 Ministry of Education, Korea Japan Aerospace Exploration Agency (JAXA) /Earth Observation Research Center (EORC) Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) Stanback Postdoctoral Fellowship Russian Foundation for Basic Research. Grant Number: 17‐05‐00382 Presidium of Russian Academy of Sciences HYCOM NOPP. Grant Number: N00014‐15‐1‐2594 DOE. Grant Number: DE‐SC0014378 National Aeronautics and Space Administration Tokyo University of Marine Science and Technology Department of Fisheries and Oceans Canada Woods Hole Oceanographic Institution
    Keywords: Beaufort Gyre ; Arctic Ocean ; Freshwater balance ; Circulation ; Modeling ; Climate change
    Repository Name: Woods Hole Open Access Server
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  • 5
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    Heterotrophy of oceanic particulate organic matter elevates net ecosystem calcification (2020)
    American Geophysical Union
    Details
    Publication Date: 2022-10-26
    Description: Author Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 46(16), (2019): 9851-9860, doi:10.1029/2019GL083726.
    Description: Coral reef calcification is expected to decline due to climate change stressors such as ocean acidification and warming. Projections of future coral reef health are based on our understanding of the environmental drivers that affect calcification and dissolution. One such driver that may impact coral reef health is heterotrophy of oceanic‐sourced particulate organic matter, but its link to calcification has not been directly investigated in the field. In this study, we estimated net ecosystem calcification and oceanic particulate organic carbon (POCoc) uptake across the Kāne'ohe Bay barrier reef in Hawai'i. We show that higher rates of POCoc uptake correspond to greater net ecosystem calcification rates, even under low aragonite saturation states (Ωar). Hence, reductions in offshore productivity may negatively impact coral reefs by decreasing the food supply required to sustain calcification. Alternatively, coral reefs that receive ample inputs of POCoc may maintain higher calcification rates, despite a global decline in Ωar.
    Description: Data needed for calculations are available in the supporting information. Additional data can be provided upon request directly from the corresponding author or accessed by links provided in the supporting information. The authors declare no competing financial interests. We thank Texas Sea Grant for providing partial funding for this project to A. Kealoha through the Grants‐In‐Aid of Graduate Research Program. We also thank the NOAA Nancy Foster Scholarship for PhD program funding to A. Kealoha and Texas A&M University for funds awarded to Shamberger that supported this work. This research was also supported by funding from National Science Foundation Grant OCE‐1538628 to Rappé. The Hawaii Institute of Marine Biology (particularly the Rappé Lab and Jason Jones), NOAA's Coral Reef Ecosystem Program, Connie Previti, Serena Smith, and Chris Maupin were instrumental in sample collection and data analysis.
    Description: 2020-02-22
    Keywords: Coral reefs ; Ocean acidification ; Climate change ; Heterotrophy
    Repository Name: Woods Hole Open Access Server
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  • 6
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    Sea-level rise will drive divergent sediment transport patterns on fore reefs and reef flats, potentially causing erosion on Atoll Islands (2020)
    Details
    Publication Date: 2022-10-21
    Description: These data files and MATLAB scripts reproduce the model data and figures as published in Bramante et al. (in prep) Modeling the impacts of a changing climate on cross-shore sediment transport: Kwajalein Atoll, Marshall Islands.
    Description: Atoll reef islands primarily consist of unconsolidated sediment, and their ocean-facing shorelines are maintained by sediment produced and transported across their reefs. Changes in incident waves can alter cross-shore sediment exchange and thus affect the sediment budget and morphology of atoll reef islands. Here we investigate the influence of sea-level rise and projected wave climate change on wave characteristics and cross-shore sediment transport across an atoll reef at Kwajalein Island, Republic of the Marshall Islands. Using a phase-resolving model, we quantify the influence on sediment transport of quantities not well-captured by wave-averaged models, namely wave asymmetry and skewness and flow acceleration. Model results suggest that for current reef geometry, sea level, and wave climate, potential bedload transport is directed onshore, decreases from the fore reef to the beach, and is sensitive to the influence of flow acceleration. We find that a projected 12% decrease in annual wave energy by 2100 CE has negligible influence on reef flat hydrodynamics. However, 0.5-2.0 m of sea-level rise increases wave heights, skewness, and shear stress on the reef flat, and decreases wave skewness and shear stress on the fore reef. These hydrodynamic changes decrease potential sediment inputs onshore from the fore reef where coral production is greatest, but increase potential cross-reef sediment transport from the outer reef flat to the beach. Assuming sediment production on the fore reef remains constant or decreases due to increasing ocean temperatures and acidification, these processes have the potential to decrease net sediment delivery to atoll islands, causing erosion.
    Description: This project was supported by the Strategic Environmental Research and Development Program through awards SERDP RC-2334 and RC-2336.
    Keywords: Climate change ; Sediment transport ; Wave model ; Fringing reef
    Repository Name: Woods Hole Open Access Server
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  • 7
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    Growth rates for Emiliania huxleyi thermal response curve across 12 temperatures from 8.5-28.6C (2020)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-10-31
    Description: Dataset: Ehux growth rates for thermal response curve
    Description: This dataset presents growth rates for Emiliania huxleyi thermal response curve across 12 temperatures from 8.5-28.6C.Global warming will be combined with predicted increases in thermal variability in the future surface ocean, but how temperature dynamics will affect phytoplankton biology and biogeochemistry is largely unknown. Here, we examine the responses of the globally important marine coccolithophore Emiliania huxleyi to thermal variations at two frequencies (1 d and 2 d) at low (18.5 °C) and high (25.5 °C) mean temperatures. Elevated temperature and thermal variation decreased growth, calcification and physiological rates, both individually and interactively. The 1 d thermal variation frequencies were less inhibitory than 2 d variations under high temperatures, indicating that high-frequency thermal fluctuations may reduce heat-induced mortality and mitigate some impacts of extreme high-temperature events. Cellular elemental composition and calcification was significantly affected by both thermal variation treatments relative to each other and to the constant temperature controls. The negative effects of thermal variation on E. huxleyi growth rate and physiology are especially pronounced at high temperatures. These responses of the key marine calcifier E. huxleyi to warmer, more variable temperature regimes have potentially large implications for ocean productivity and marine biogeochemical cycles under a future changing climate. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/782911
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1538525
    Keywords: Thermal Performance Curves ; Growth Rates ; Emiliania huxleyi ; Climate change ; Calcification ; Elemental quotas
    Repository Name: Woods Hole Open Access Server
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  • 8
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    Elemental stoichiometry for Emiliania huxleyi across a range of 12 temperatures from 8.5-28.6C (2020)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-10-31
    Description: Dataset: Ehux elemental composition across thermal range
    Description: This dataset includes elemental stoichiometry for Emiliania huxleyi across a range of 12 temperatures from 8.5-28.6C. Global warming will be combined with predicted increases in thermal variability in the future surface ocean, but how temperature dynamics will affect phytoplankton biology and biogeochemistry is largely unknown. Here, we examine the responses of the globally important marine coccolithophore Emiliania huxleyi to thermal variations at two frequencies (1 d and 2 d) at low (18.5 °C) and high (25.5 °C) mean temperatures. Elevated temperature and thermal variation decreased growth, calcification and physiological rates, both individually and interactively. The 1 d thermal variation frequencies were less inhibitory than 2 d variations under high temperatures, indicating that high-frequency thermal fluctuations may reduce heat-induced mortality and mitigate some impacts of extreme high-temperature events. Cellular elemental composition and calcification was significantly affected by both thermal variation treatments relative to each other and to the constant temperature controls. The negative effects of thermal variation on E. huxleyi growth rate and physiology are especially pronounced at high temperatures. These responses of the key marine calcifier E. huxleyi to warmer, more variable temperature regimes have potentially large implications for ocean productivity and marine biogeochemical cycles under a future changing climate. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/782921
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1538525
    Keywords: Thermal Performance Curves ; Growth Rates ; Emiliania huxleyi ; Climate change ; Calcification ; Elemental quotas
    Repository Name: Woods Hole Open Access Server
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  • 9
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    Growth rates under low and high temperatures for Emiliania huxleyi in constant and fluctuating thermal environments (2020)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-10-31
    Description: Dataset: Ehux growth rates under thermal variation
    Description: This dataset includes the growth rates under low and high temperatures for E. huxleyi in constant and fluctuating thermal environments. Global warming will be combined with predicted increases in thermal variability in the future surface ocean, but how temperature dynamics will affect phytoplankton biology and biogeochemistry is largely unknown. Here, we examine the responses of the globally important marine coccolithophore Emiliania huxleyi to thermal variations at two frequencies (1 d and 2 d) at low (18.5 °C) and high (25.5 °C) mean temperatures. Elevated temperature and thermal variation decreased growth, calcification and physiological rates, both individually and interactively. The 1 d thermal variation frequencies were less inhibitory than 2 d variations under high temperatures, indicating that high-frequency thermal fluctuations may reduce heat-induced mortality and mitigate some impacts of extreme high-temperature events. Cellular elemental composition and calcification was significantly affected by both thermal variation treatments relative to each other and to the constant temperature controls. The negative effects of thermal variation on E. huxleyi growth rate and physiology are especially pronounced at high temperatures. These responses of the key marine calcifier E. huxleyi to warmer, more variable temperature regimes have potentially large implications for ocean productivity and marine biogeochemical cycles under a future changing climate. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/782888
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1538525
    Keywords: Thermal Performance Curves ; Growth Rates ; Emiliania huxleyi ; Climate change ; Calcification ; Elemental quotas
    Repository Name: Woods Hole Open Access Server
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  • 10
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    Continuous culture studies of possible climate change effects: Thalassiosira pseudonana CCMP1335 growth in nitrate-limited and nutrient-replete cultures (2020)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-10-31
    Description: Dataset: Thalassiosira pseudonana CCMP1335 in nitrate-limited and nutrient-replete cultures
    Description: The marine diatom Thalassiosira pseudonana clone CCMP 1335 was grown in a continuous culture system on a 14:10 light-dark cycle under either nitrate-limited or nutrient-replete conditions, a photoperiod irradiance of either 50 or 300 micro-mol photons per square meter per second, partial pressures of either 400 or 1000 ppm CO2, and temperatures ranging from 5 to 32 degrees Celsius. Growth rates, photosynthetic rates, respiration rates, C:N ratios, C:Chlorophyll-a ratios, productivity indices, Fv/Fm ratios, and the initial slope and light-saturated asymptote of short-term photosynthesis-irradiance curves are reported. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/779368
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1536581
    Keywords: Climate change ; Phytoplankton ; Light ; Temperature ; CO2 partial pressure ; Acclimation
    Repository Name: Woods Hole Open Access Server
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  • 11
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    Simulated estuary-wide response of seagrass (Zostera marina) to future scenarios of temperature and sea level (2020)
    Frontiers Media
    Details
    Publication Date: 2022-10-27
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Scalpone, C. R., Jarvis, J. C., Vasslides, J. M., Testa, J. M., & Ganju, N. K. Simulated estuary-wide response of seagrass (Zostera marina) to future scenarios of temperature and sea level. Frontiers in Marine Science, 7, (2020): 539946, doi:10.3389/fmars.2020.539946.
    Description: Seagrass communities are a vital component of estuarine ecosystems, but are threatened by projected sea level rise (SLR) and temperature increases with climate change. To understand these potential effects, we developed a spatially explicit model that represents seagrass (Zostera marina) habitat and estuary-wide productivity for Barnegat Bay-Little Egg Harbor (BB-LEH) in New Jersey, United States. Our modeling approach included an offline coupling of a numerical seagrass biomass model with the spatially variable environmental conditions from a hydrodynamic model to calculate above and belowground biomass at each grid cell of the hydrodynamic model domain. Once calibrated to represent present day seagrass habitat and estuary-wide annual productivity, we applied combinations of increasing air temperature and sea level following regionally specific climate change projections, enabling analysis of the individual and combined impacts of these variables on seagrass biomass and spatial coverage. Under the SLR scenarios, the current model domain boundaries were maintained, as the land surrounding BB-LEH is unlikely to shift significantly in the future. SLR caused habitat extent to decrease dramatically, pushing seagrass beds toward the coastline with increasing depth, with a 100% loss of habitat by the maximum SLR scenario. The dramatic loss of seagrass habitat under SLR was in part due to the assumption that surrounding land would not be inundated, as the model did not allow for habitat expansion outside the current boundaries of the bay. Temperature increases slightly elevated the rate of summer die-off and decreased habitat area only under the highest temperature increase scenarios. In combined scenarios, the effects of SLR far outweighed the effects of temperature increase. Sensitivity analysis of the model revealed the greatest sensitivity to changes in parameters affecting light limitation and seagrass mortality, but no sensitivity to changes in nutrient limitation constants. The high vulnerability of seagrass in the bay to SLR exceeded that demonstrated for other systems, highlighting the importance of site- and region-specific assessments of estuaries under climate change.
    Description: This research was supported by the National Science Foundation Research Experience for Undergraduates Program (OCE-1659463), the Woods Hole Oceanographic Institution Summer Student Fellowship Program, the Barnegat Bay Partnership (through a US EPA Clean Water Act grant to Ocean County College; CE98212313), and the USGS Coastal and Marine Hazards/Resources Program. Although this project has been funded in part by the United States Environmental Protection Agency pursuant to a grant agreement with Ocean County College, it has not gone through the Agency’s publications review process and may not necessarily reflect the views of the Agency; therefore, no official endorsement should be assumed. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
    Keywords: Seagrass (Zostera) ; Climate change ; Spatial model ; Sea level rise ; Temperature ; North American Atlantic Coast ; Regional ; Eelgrass (Zostera marina)
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  • 12
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    Continuous culture studies of possible climate change effects: Synechococcus elongatus CCMP1629 growth in nitrate-limited and nutrient-replete cultures (2020)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-10-31
    Description: Dataset: Synechococcus elongatus CCMP1629 in nitrate-limited and nutrient-replete cultures
    Description: The marine cyanobacterium Synechococcus elongatus clone CCMP1629 was grown in a continuous culture system on a 14:10 light-dark cycle under either nitrate-limited or nutrient-replete conditions, a photoperiod irradiance of either 50 or 300 micro-mol photons per square meter per second, partial pressures of either 400 or 1000 ppm CO2, and temperatures ranging from 20 to 45 degrees Celsius. Growth rates, photosynthetic rates, respiration rates, C:N ratios, C:Chlorophyll-a ratios, productivity indices, Fv/Fm ratios, and the initial slope and light-saturated asymptote of short-term photosynthesis-irradiance curves are reported. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/811093
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1536581
    Keywords: Climate change ; Phytoplankton ; Light ; Temperature ; CO2 partial pressure ; Acclimation
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  • 13
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    Gill Net Catch Data in Bays along Texas Coast from 1986 to 2018 (2020)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-10-31
    Description: Dataset: Gill Net Catch Data
    Description: Vertebrate caught with gill net in Sabine Lake, Galveston Bay, Matagorda Bay, San Antonio Bay, Aransas Bay, Corpus Christi Bay, Upper Laguna Madre, and Lower Laguna Madre from 1986 to 2018 (except in Sabine Lake sampling begun in 1986). For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/828794
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1656923
    Keywords: Marine biodiversity ; Climate change ; Coastal ecosystems ; Fish diversity
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  • 14
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    Intracellular elemental quotas under low and high temperatures for E. huxleyi in constant and fluctuating thermal environments (2020)
    Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu
    Details
    Publication Date: 2022-10-31
    Description: Dataset: Ehux physiology under thermal variation
    Description: Intracellular elemental quotas under low and high temperatures for E. huxleyi in constant and fluctuating thermal environments. This dataset includes the growth rates under low and high temperatures for E. huxleyi in constant and fluctuating thermal environments. Global warming will be combined with predicted increases in thermal variability in the future surface ocean, but how temperature dynamics will affect phytoplankton biology and biogeochemistry is largely unknown. Here, we examine the responses of the globally important marine coccolithophore Emiliania huxleyi to thermal variations at two frequencies (1 d and 2 d) at low (18.5 °C) and high (25.5 °C) mean temperatures. Elevated temperature and thermal variation decreased growth, calcification and physiological rates, both individually and interactively. The 1 d thermal variation frequencies were less inhibitory than 2 d variations under high temperatures, indicating that high-frequency thermal fluctuations may reduce heat-induced mortality and mitigate some impacts of extreme high-temperature events. Cellular elemental composition and calcification was significantly affected by both thermal variation treatments relative to each other and to the constant temperature controls. The negative effects of thermal variation on E. huxleyi growth rate and physiology are especially pronounced at high temperatures. These responses of the key marine calcifier E. huxleyi to warmer, more variable temperature regimes have potentially large implications for ocean productivity and marine biogeochemical cycles under a future changing climate. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/782901
    Description: NSF Division of Ocean Sciences (NSF OCE) OCE-1538525
    Keywords: Thermal Performance Curves ; Growth Rates ; Emiliania huxleyi ; Climate change ; Calcification ; Elemental quotas
    Repository Name: Woods Hole Open Access Server
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  • 15
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    Soothsaying DOM: A current perspective on the future of oceanic dissolved organic carbon (2020)
    Frontiers Media
    Details
    Publication Date: 2022-10-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Wagner, S., Schubotz, F., Kaiser, K., Hallmann, C., Waska, H., Rossel, P. E., Hansmann, R., Elvert, M., Middelburg, J. J., Engel, A., Blattmann, T. M., Catala, T. S., Lennartz, S. T., Gomez-Saez, G., V., Pantoja-Gutierrez, S., Bao, R., & Galy, V. Soothsaying DOM: A current perspective on the future of oceanic dissolved organic carbon. Frontiers in Marine Science, 7, (2020): 341, doi:10.3389/fmars.2020.00341.
    Description: The vast majority of freshly produced oceanic dissolved organic carbon (DOC) is derived from marine phytoplankton, then rapidly recycled by heterotrophic microbes. A small fraction of this DOC survives long enough to be routed to the interior ocean, which houses the largest and oldest DOC reservoir. DOC reactivity depends upon its intrinsic chemical composition and extrinsic environmental conditions. Therefore, recalcitrance is an emergent property of DOC that is analytically difficult to constrain. New isotopic techniques that track the flow of carbon through individual organic molecules show promise in unveiling specific biosynthetic or degradation pathways that control the metabolic turnover of DOC and its accumulation in the deep ocean. However, a multivariate approach is required to constrain current carbon fluxes so that we may better predict how the cycling of oceanic DOC will be altered with continued climate change. Ocean warming, acidification, and oxygen depletion may upset the balance between the primary production and heterotrophic reworking of DOC, thus modifying the amount and/or composition of recalcitrant DOC. Climate change and anthropogenic activities may enhance mobilization of terrestrial DOC and/or stimulate DOC production in coastal waters, but it is unclear how this would affect the flux of DOC to the open ocean. Here, we assess current knowledge on the oceanic DOC cycle and identify research gaps that must be addressed to successfully implement its use in global scale carbon models.
    Description: This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) project number 422798570. The Hanse-Wissenschaftskolleg and the Geochemical Society provided funding for the conference. Additional support was provided by the National Science Foundation OCE #1756812 to SW. TB acknowledges funding from ETH Zürich and JAMSTEC. JM was supported by the Netherlands Earth System Science Centre. SP-G was funded by COPAS Sur-Austral (CONICYT PIA APOYO CCTE AFB170006). GG-S acknowledges funding from DFG, DI 842/6-1.
    Keywords: Dissolved organic carbon ; Global carbon cycle ; Recalcitrance ; Isotopic probing ; Climate change
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  • 16
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    Editorial: advances in understanding marine heatwaves and their impacts (2020)
    Frontiers Media
    Details
    Publication Date: 2022-10-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Benthuysen, J. A., Oliver, E. C. J., Chen, K., & Wernberg, T. Editorial: advances in understanding marine heatwaves and their impacts. Frontiers in Marine Science, 7, (2020): 147, doi:10.3389/fmars.2020.00147.
    Description: Editorial on the Research Topic Advances in Understanding Marine Heatwaves and Their Impacts In recent years, prolonged, extremely warm water events, known as marine heatwaves, have featured prominently around the globe with their disruptive consequences for marine ecosystems. Over the past decade, marine heatwaves have occurred from the open ocean to marginal seas and coastal regions, including the unprecedented 2011 Western Australia marine heatwave (Ningaloo Niño) in the eastern Indian Ocean (e.g., Pearce et al., 2011), the 2012 northwest Atlantic marine heatwave (Chen et al., 2014), the 2012 and 2015 Mediterranean Sea marine heatwaves (Darmaraki et al., 2019), the 2013/14 western South Atlantic (Rodrigues et al., 2019) and 2017 southwestern Atlantic marine heatwave (Manta et al., 2018), the persistent 2014–2016 “Blob” in the North Pacific (Bond et al., 2015; Di Lorenzo and Mantua, 2016), the 2015/16 marine heatwave spanning the southeastern tropical Indian Ocean to the Coral Sea (Benthuysen et al., 2018), and the Tasman Sea marine heatwaves in 2015/16 (Oliver et al., 2017) and 2017/18 (Salinger et al., 2019). These events have set new records for marine heatwave intensity, the temperature anomaly exceeding a climatology, and duration, the sustained period of extreme temperatures. We have witnessed the profound consequences of these thermal disturbances from acute changes to marine life to enduring impacts on species, populations, and communities (Smale et al., 2019). These marine heatwaves have spurred a diversity of research spanning the methodology of identifying and quantifying the events (e.g., Hobday et al., 2016) and their historical trends (Oliver et al., 2018), understanding their physical mechanisms and relationships with climate modes (e.g., Holbrook et al., 2019), climate projections (Frölicher et al., 2018), and understanding the biological impacts for organisms and ecosystem function and services (e.g., Smale et al., 2019). By using sea surface temperature percentiles, temperature anomalies can be quantified based on their local variability and account for the broad range of temperature regimes in different marine environments. For temperatures exceeding a 90th-percentile threshold beyond a period of 5-days, marine heatwaves can be classified into categories based on their intensity (Hobday et al., 2018). While these recent advances have provided the framework for understanding key aspects of marine heatwaves, a challenge lies ahead for effective integration of physical and biological knowledge for prediction of marine heatwaves and their ecological impacts. This Research Topic is motivated by the need to understand the mechanisms for how marine heatwaves develop and the biological responses to thermal stress events. This Research Topic is a collection of 18 research articles and three review articles aimed at advancing our knowledge of marine heatwaves within four themes. These themes include methods for detecting marine heatwaves, understanding their physical mechanisms, seasonal forecasting and climate projections, and ecological impacts.
    Description: We thank the contributing authors, reviewers, and the editorial staff at Frontiers in Marine Science for their support in producing this issue. We thank the Marine Heatwaves Working Group (http://www.marineheatwaves.org/) for inspiration and discussions. This special issue stemmed from the session on Advances in Understanding Marine Heat Waves and Their Impacts at the 2018 Ocean Sciences meeting (Portland, USA).
    Keywords: Marine heatwaves ; Extreme events ; Ocean and atmosphere interactions ; Marine ecosystems ; Marine resources ; Climate change ; Climate variability ; Climate prediction
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    The emperor penguin - vulnerable to projected rates of warming and sea ice loss (2020)
    Elsevier
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Trathan, P. N., Wienecke, B., Barbraud, C., Jenouvrier, S., Kooyman, G., Le Bohec, C., Ainley, D. G., Ancel, A., Zitterbart, D. P., Chown, S. L., LaRue, M., Cristofari, R., Younger, J., Clucas, G., Bost, C., Brown, J. A., Gillett, H. J., & Fretwell, P. T. The emperor penguin - vulnerable to projected rates of warming and sea ice loss. Biological Conservation, 241, (2020): 108216, doi:10.1016/j.biocon.2019.108216.
    Description: We argue the need to improve climate change forecasting for ecology, and importantly, how to relate long-term projections to conservation. As an example, we discuss the need for effective management of one species, the emperor penguin, Aptenodytes forsteri. This species is unique amongst birds in that its breeding habit is critically dependent upon seasonal fast ice. Here, we review its vulnerability to ongoing and projected climate change, given that sea ice is susceptible to changes in winds and temperatures. We consider published projections of future emperor penguin population status in response to changing environments. Furthermore, we evaluate the current IUCN Red List status for the species, and recommend that its status be changed to Vulnerable, based on different modelling projections of population decrease of ≥50% over the current century, and the specific traits of the species. We conclude that current conservation measures are inadequate to protect the species under future projected scenarios. Only a reduction in anthropogenic greenhouse gas emissions will reduce threats to the emperor penguin from altered wind regimes, rising temperatures and melting sea ice; until such time, other conservation actions are necessary, including increased spatial protection at breeding sites and foraging locations. The designation of large-scale marine spatial protection across its range would benefit the species, particularly in areas that have a high probability of becoming future climate change refugia. We also recommend that the emperor penguin is listed by the Antarctic Treaty as an Antarctic Specially Protected Species, with development of a species Action Plan.
    Description: We thank Thomas J. Bracegirdle, Tony Phillips and Kevin Hughes for helpful comments on earlier drafts of this manuscript. PNT acknowledges the support of WWF-UK under GB095701 and SJ the support of NSF OPP1744794 and 1643901.
    Keywords: Antarctic ; Climate change ; Aptenodytes forsteri ; IUCN Red List threat status ; Protection ; Conservation
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    Intergyre salt transport in the climate warming response (2020)
    American Meteorological Society
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(1), (2020): 255-268, doi:10.1175/JPO-D-19-0166.1.
    Description: Regional connectivity is important to the global climate salinity response, particularly because salinity anomalies do not have a damping feedback with atmospheric freshwater fluxes and may therefore be advected over long distances by ocean circulation, resulting in nonlocal influences. Climate model intercomparison experiments such as CMIP5 exhibit large uncertainty in some aspects of the salinity response, hypothesized here to be a result of ocean dynamics. We use two types of Lagrangian particle tracking experiments to investigate pathways of exchange for salinity anomalies. The first uses forward trajectories to estimate average transport time scales between water cycle regimes. The second uses reverse trajectories and a freshwater accumulation method to quantitatively identify remote influences in the salinity response. Additionally, we compare velocity fields with both resolved and parameterized eddies to understand the impact of eddy stirring on intergyre exchange. These experiments show that surface anomalies are readily exchanged within the ocean gyres by the mean circulation, but intergyre exchange is slower and largely eddy driven. These dynamics are used to analyze the North Atlantic salinity response to climate warming and water cycle intensification, where the system is broadly forced with fresh surface anomalies in the subpolar gyre and salty surface anomalies in the subtropical gyres. Under these competing forcings, strong intergyre eddy fluxes carry anomalously salty subtropical water into the subpolar gyre which balances out much of the local freshwater input.
    Description: We acknowledge the World Climate Research Programme’s Working Group on Coupled Modelling, which is responsible for CMIP, and we thank the climate modeling groups (listed in Table 1 of this paper) for producing and making available their model output. We also thank the creators of the SODA and ECCO reanalysis products. This work was supported by NASA Headquarters under the NASA Earth and Space Science Fellowship Program Award 80NSSC17K0372, and by National Science Foundation Award OCE-1433132. The SODA outputs used here can be accessed at http://www.atmos.umd.edu/~ocean/, and the ECCO outputs at https://ecco.jpl.nasa.gov/. Data from the CMIP5 ensemble is available at https://esgf-node.llnl.gov/projects/esgf-llnl/. The particle tracking code used for these experiments can be found at https://github.com/slevang/particle-tracking.
    Description: 2020-07-20
    Keywords: North Atlantic Ocean ; Eddies ; Hydrologic cycle ; Lagrangian circulation/transport ; Transport ; Climate change
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    An observational estimate of the direct response of the cold-season atmospheric circulation to the Arctic Sea ice loss (2020)
    American Meteorological Society
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 33(9), (2020): 3863-3882, doi:10.1175/JCLI-D-19-0687.1.
    Description: The direct response of the cold-season atmospheric circulation to the Arctic sea ice loss is estimated from observed sea ice concentration (SIC) and an atmospheric reanalysis, assuming that the atmospheric response to the long-term sea ice loss is the same as that to interannual pan-Arctic SIC fluctuations with identical spatial patterns. No large-scale relationship with previous interannual SIC fluctuations is found in October and November, but a negative North Atlantic Oscillation (NAO)/Arctic Oscillation follows the pan-Arctic SIC fluctuations from December to March. The signal is field significant in the stratosphere in December, and in the troposphere and tropopause thereafter. However, multiple regressions indicate that the stratospheric December signal is largely due to concomitant Siberian snow-cover anomalies. On the other hand, the tropospheric January–March NAO signals can be unambiguously attributed to SIC variability, with an Iceland high approaching 45 m at 500 hPa, a 2°C surface air warming in northeastern Canada, and a modulation of blocking activity in the North Atlantic sector. In March, a 1°C northern Europe cooling is also attributed to SIC. An SIC impact on the warm Arctic–cold Eurasia pattern is only found in February in relation to January SIC. Extrapolating the most robust results suggests that, in the absence of other forcings, the SIC loss between 1979 and 2016 would have induced a 2°–3°C decade−1 winter warming in northeastern North America and a 40–60 m decade−1 increase in the height of the Iceland high, if linearity and perpetual winter conditions could be assumed.
    Description: This research was supported by the Blue-Action project (European Union’s Horizon 2020 research and innovation program, Grant 727852) and by the National Science Foundation (OPP 1736738).
    Description: 2020-10-06
    Keywords: Atmosphere-ocean interaction ; Climate change ; Climate variability ; Ice loss/growth
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  • 20
    Electronic Resource
    Electronic Resource
    Über den enzymatischen Abbau des Histamins I (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 717-726 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird gezeigt, dass die enzymatische Histamin-Spaltung ein oxydativer Vorgang ist, bei dem ein Äquivalent Stickstoff in Form von Ammoniak in Freiheit gesetzt wird. Die Frage, ob dieses Stickstoff-Atom aus dem Kern stammt, ist auf Grund der analogen Modellversuche mit Ascorbinsäure und Eisenkatalyse wahrscheinlich im positiven Sinn zu beantworten, muss aber erst endgültig bewiesen werden. Auf Grund dieses Verhaltens muss das Enzym höchstwahrscheinlich als ein sogenanntes Häminferment angesehen werden. Bei der Histaminspaltung bildet sich ein Pigment. Ausserdem ist es gelungen, ein Keton in Form eines wohlcharakterisierten Dinitro-phenylhydrazons zu isolieren, dessen Konstitutionsermittlung im Gange ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001104
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    Darstellung und Eigenschaften des Osazones der Dehydro-ascorbinsäure (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 742-746 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001107
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  • 22
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    Constante diélectrique et moment dipolaire des maléate et fumarate d'éthyle et de leurs ozonides (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 762-767 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pour les constantes diélectriques et les moments dipolaires des maléate et fumarate l'éthyle et des ozonides de ces deux corps, les valeurs trouvées sont: .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001109
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    Propriétés des polymères en solution IV. Energie libre et chaleur de formation. Solutions de valérianate et de sébacate de butyle (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 768-779 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1° Nous avons mesuré, par la méthode calorimétrique, les chaleurs de formation des mélanges binaires: .
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001110
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    Propriétés des polymères en solution V. Mesure des pressions de vapeur (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 779-782 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Description d'un appareillage pour la mesure précise et rapide de la pression de vapeur en équilibre avec une solution liquide on sous forme de gel. Cet appareil peut être utilisé avec des quantités de substances inférieures à 0,1 gr.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.193702001111
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  • 25
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    Polyterpene und Polyterpenoide CXII. Dehydrierungen in der Amyrinreihe (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 791-804 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001113
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    Polyterpene und Polyterpenoide CXIII. Oxydationen in der Reihe der Oleanolsäure ohne Sprengung des Ringsystems. Über die Natur des vierten Sauerstoffatoms der Glycyrrhetinsäure (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 804-808 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001114
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    Über Bestandteile der Nebennieren-Rinde IX (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 817-827 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001117
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    Die Strukturformel des durch elektrochemische Reduktion von Methyl-benzyl-acetessigester gewonnenen Kohlenwasserstoffs C12H18 (Tafel'sche Umlagerung III) (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 846-851 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001119
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    Commission des réactifs nouveaux. La classification des réactions qualitatives analytiques (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 852-852 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001121
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  • 30
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    Photolysen mit Zinksulfid (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 853-877 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wird festgestellt, dass Farbstoffe vom Typus des Methylenblaus schwärzungsfähiges Zinksulfid desensibilieren.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.193702001123
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    Über die Desensibilierung von Anthrachinon-Farbstoffen und die Lichtbleiche von Geweben (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 879-881 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001125
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    Eine Aufspaltung des Cumaronkerns (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 892-894 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001128
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  • 33
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    Über 4,6-Diamino-1,3-diacetyl-benzol und seine Überführung in Derivate des lin. Benzo-dipyridins. (30. Mitteilung über Stickstoff-Heterocyclen) (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 905-913 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001130
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    Beitrag zur Indigosynthese aus o-substituierten Acetophenonen. (31. Mitteilung über Stickstoff-Heterocyclen) (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 913-918 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001131
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    Ein Apparat zur Extraktion von Lösungen mit schweren Lösungsmitteln (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 927-931 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.193702001134
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    Über einige thermische Eigenschaften des Vinylbromids (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 936-949 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurde die Dampfdruckkurve von Vinylbromid in dem Temperaturbereich von - 80° bis + 50° bestimmt.
    Additional Material: 7 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.193702001136
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    Über die thermische Zersetzung von Di-benzoyl-peroxyd in Gegenwart von Deuterium (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1015-1016 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001146
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    Zur Kenntnis der 1-Amino-2-methyl-naphtalin-4-sulfosäure (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1024-1040 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Nitrierung des 2-Methyl-naphtalins wurde nach verschiedenen Methoden durchgeführt. Man erhält zur Hauptsache 1-Nitro-2-methyl-naphtalin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001149
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    d- und l-Tagato-methylose (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1529-1536 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001203
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    Polyterpene und Polyterpenoide CXX. Umwandlung der Oleanolsäure in β-Amyrin und Erythro-diol (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1553-1556 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001206
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    Polyterpene und Polyterpenoide CXXII. Nachweis einer Doppelbindung in der Chinovasäure (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1570-1575 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.193702001209
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    Über Amminkomplexe von Schwermetallsalzen der Adipinsäure (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1575-1578 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001210
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    Protokoll (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1603-1604 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001214
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    Bei der Redaktion eingelaufene Bücher (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1604-1604 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001215
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    Bemerkung zu der Chlorierung von Nitrobenzol in Gegenwart von Eisen(III)chlorid (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1458-1461 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Chlorierung von trockenem Nitrobenzol mit trockenem Chlor in Gegenwart von wasserfreiem Eisen(III)chlorid bilden sich bei 40° m-Nitrochlorbenzol, 1,2-Nitrochlorbenzol, 1,4-Nitrochlorbenzol und 2,5-Dichlor-nitrobenzol. Geht man bei der Chlorierung auf höhere Temperaturen, so bilden sich beträchtliche Mengen an Hexachlorbenzol, welches aus dem Nitrobenzol entsteht und nicht aus Benzol.
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    URL: http://dx.doi.org/10.1002/hlca.193702001196
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    Sur la production de l'ozone par l'électrolyse. Electrolyse à basse température (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1510-1523 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: En vue d'augmenter le rendement de production de l'ozone par électrolyse, celle-ci a été opérée en réfrigérant énergiquement l'anolyte.
    Additional Material: 1 Ill.
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    l-Tagatose (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1537-1541 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001204
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    Zur Kenntnis der flüchtigen Pflanzenstoffe V. Über die Darstellung des Grundkörpers der Azulen-Reihe (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 224-232 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Darstellung und Eigenschaften des Azulens, Bicyclo-[0,3,5]-decapentaen-(1,3,5,7,9), wurden beschrieben.
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    URL: http://dx.doi.org/10.1002/hlca.19370200133
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    Sexualhormone XX. Herstellung von Oxyden aus Δ5-Cholestenon und aus Δ5-Androstendion (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 244-249 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/hlca.19370200135
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    Absorptionsspektrophotometrie von Lösungen im kurzwelligen Ultraviolett (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 282-285 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.19370200139
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    Lichtabsorption der R1-R1-Systeme I. Spektren von Cholestenon, Cholestenon-oxim, Mesityloxyd, Pulegon und Carvon (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 289-293 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.19370200142
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    Sur une nouvelle synthèse de l'alcool anisique (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 53-55 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200105
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    Zur Konstitution der Lactoflavin-phosphorsäure aus Leber (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 79-83 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/hlca.19370200108
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    Reduktionsprodukte von Disacchariden: Maltit, Lactit, Cellobit (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 86-90 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/hlca.19370200110
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    Polyterpene und Polyterpenoide CXI. Über die Bruttoformel der Glycyrrhetinsäure (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 312-325 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Tab.
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    URL: http://dx.doi.org/10.1002/hlca.19370200146
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    Atomgewichte 1937 (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 346-346 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200150
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    Bei der Redaktion eingelaufene Bücher (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 352-352 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200154
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    Recherches sur les réactifs organiques, susceptibles d'applications à l'analyse minérale. I. La 9-méthyle-2-3-7-trioxy-6-fluorone, réactif spécial des cations de l'antimoine (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 362-367 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/hlca.19370200157
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    Nochmals zur Frage der Existenz von Querelementen in den nativen vegetabilische Gespinstfasern (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 199-203 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.19370200125
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    Bemerkung zur Notiz von Y. Asahina und S. Takagi über das Artemisia-keton (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 221-221 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200131
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    Positions des atomes dans le nouveau modèle spatial de la cellulose (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 232-244 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Partant d'un modèle de la cellobiose, dans lequel les angles et les distances interatomiques sont en harmonie avec les données actuelles, un nouveau modèle spatial de la cellulose a été construit. Dans ce modèle, les deux chaînes cellobiosiques qui traversent la maille élémentaire parallèlement à l'axe, b, ont des directions opposées. Les paramètres des atomes ont été trouvés à l'aide des intensités relatives des interférences aux Rayons X.
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    Molekulare Resonanzsysteme II. Herstellung und Eigenschaften substituierter Anilin-sulfon-phtaleine (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 498-513 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200176
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    Contribution à l'étude de la 2,3-naphtylène-diamine (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 520-524 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200179
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    Zur Kenntnis des Kohlenstoffringes XXXI. Über die Beziehungen zwischen Schmelzpunkt und Dichte in aliphatischen und cyclischen homologen Reihen (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 548-562 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.19370200182
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    Bericht zur Jahresrechnung per 31. Dezember 1936 (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 570-572 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200186
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    Reduktionswirkungen des N-Glucosido-o-dihydro-nicotinsäureamids und analoger Verbindungen (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 622-625 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/hlca.19370200191
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    Glucosaminol, ein Reduktionsprodukt des Glucosamins (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 626-627 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/hlca.19370200192
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    Die Verschiebungsregel des Geschwindigkeitsmaximums der bimolekularen heterogenen Reaktion (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 644-647 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.19370200195
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    Molekulare Resonanzsysteme IV. Die Absorptionsspektren einiger Sulfon-phtaleine (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 654-658 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 15 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.19370200198
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    Über die Synthese eines Glycerin-d1 aus optisch-aktivem Aceton-d-glycerinaldehyd (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1012-1014 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001145
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    β-Apo-4-carotinal, ein weiteres Abbauprodukt des β-Carotins (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1020-1024 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.193702001148
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    Δ5-3-Oxy-ätio-cholensäure und einige ihrer Umwandlungsprodukte (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1040-1054 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/hlca.193702001150
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    Über die Einwirkung primärer aliphatischer Basen auf Campherchinon II (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1078-1097 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.193702001153
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    Zur Bestimmung von Vitamin B1 im menschlichen Harn (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1147-1155 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
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    URL: http://dx.doi.org/10.1002/hlca.193702001156
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    Azofarbstoffe und Immunbiologie. Aufhebung anaphylaktischer Azoprotein-Überempfindlichkeit durch p-Phenyl-arsinsäure-azofarbstoffe (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1059-1077 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Azoprotein (sowohl in vitro hergestelltes als in vivo entstehendes) enthält entsprechend der Annahme von Pauly die Azo-gruppierung —N=N—.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.193702001152
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    Chemische Kampfstoffe V. Diskussion der Absorptionsbande von β,β′-Dichlor-diäthyl-sulfid (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1188-1192 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001161
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    Polyterpene und Polyterpenoide CXVI. Zur Kenntnis der Oxydation der Acetyl-oleanolsäure mit Chromtrioxyd unter Öffnung der Doppelbindung (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1192-1200 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001162
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    Synthesen niederer Methyl-zucker (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1213-1226 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001166
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    Polyterpene und Polyterpenoide CXVII. Zur Kenntnis der Bedingungen und des Mechanismus der Dehydrierung der homologen Sterine und der Cholsäure (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1245-1253 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001169
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    Über Chinonreaktionen (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1260-1270 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001171
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    Sexualhormone XXVI. Zur Kenntnis der Oxydation von Cholesterin-acetat-dibromid mit Chromtrioxyd (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1291-1297 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001175
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    Krystallisiertes l-Threonsäure-lacton und Synthese des l-Threonsäure-2-methyläthers (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1298-1303 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001176
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  • 83
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    Propriétés de polymères en solution VIII. Formation de micelles dans les solutions de substances à molécules caténiformes (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1321-1330 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Les mêmes causes qui déterminent l'insolubilité des paraffines: la forte cohésion du dissolvant ainsi que l'attraction mutuelle des méthylènes provoquent une association des chaînes paraffiniques. Cette association se traduit par la présence, dans la solution, de micelles.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001181
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    Les propriétés des polymères en solution IX. Gélatinisation (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1331-1334 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: La solubilité de substances polymérisées varie d'autant plus rapidement avec la température que le degré de polymérisation est plus élevé. Cela permet d'expliquer l'apparition de «points» de transformation dans les expériences avec des solutions de polymères supérieures. La formation thermo-réversible de gelées est le plus souvent une sorte de cristallisation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001182
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    Zur Kenntnis der Eigenschaften isosterer und strukturähnlicher Verbindungen III: Über die Synthese in 5-Stellung geminal substituierter 2,4-Dioxo-thiazolidine mit narkotischen Eigenschaften (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1388-1393 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001186
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  • 86
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    Stufenweiser Abbau des labilen und stabilen Bixins. Zur Stereochemie der Carotinoide (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1396-1407 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001188
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    Recherches sur les réactifs organiques susceptibles d'applications à l'analyse minérale. La méthyl-9-trihydroxy-2,3,7-fluorone-6, réactif spécifique des cations de l'antimoine (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1427-1445 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001193
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    Bestimmung des Dipolmoments von Lösungen (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1447-1457 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001195
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    Darstellung höhermolekularer Alkylhalogenide (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1462-1467 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (1) Die Umsetzung von höhermolekularen aliphatischen Alkoholen mit Chlorwasserstoff zu Alkylchloriden erfolgt in Gegenwart von Zinksalzen, und zwar besonders von Zinkchlorid annähernd quantitativ.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.193702001197
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    k-Strophanthosid, das Hauptglucosid der Samen von Strophanthus kombé (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1484-1510 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/hlca.193702001200
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    Polyterpene und Polyterpenoide CXIX. Über die Anzahl und die gegenseitige Lage der Doppelbindungen bei der Laevo-pimarsäure (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1542-1552 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001205
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    Polyterpene und Polyterpenoide CXXI. Bruttoformel und Dehydrierung des Lupeols (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1564-1570 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001208
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    Molekulare Resonanzsysteme VI. Die Farberscheinungen bei den Phtaleinen (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1591-1600 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001212
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    X Congresso internazionale di Chimica. Roma, 15-21 maggio 1938 (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 1601-1602 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193702001213
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    Azofarbstoffe und Immunbiologie. Schultz-Dale'sche Versuche mit Bis-p-succinanilsäure-azo-resorcin (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 16-37 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurde z. T. nach Landsteiner und van der Scheer, z. T. nach andern Verfahren 4-Nitro-succinanilsäure, 4-Amino-succinanilsäure, 4-Succinanilsäure-azo-resorcin, Bis-p-succinanilsäure-azo-resorcin und 4-Succinanilsäure-azo-proteine hergestellt.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/hlca.19370200103
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    Dihydro-pyridinverbindungen IV. N-Phenyl-o-dihydro-pyridin und N-p-Methoxyphenyl-o-dihydro-pyridin (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 72-79 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200107
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    Modellversuche betreffend die wasserstoffübertragenden Wirkungsgruppen der Cofermente (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 55-71 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200106
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    Über einige Derivate des Phenyl-glucamins (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 90-96 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200111
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    Zur Kenntnis des Kohlenstoffringes XXIX. Über die Dichtekurve der cyclischen Diketone (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 128-132 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200115
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    Etude sur les dérivés benzoylés de l'indigo IV (1937)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 20 (1937), S. 132-141 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19370200116
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