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310 results for “Chemical Biology”
Fig. 2 in Chemical and biological studies of Daphniphyllum oldhamii from Hunan Province, China
Fig. 2. ORTEP drawing of 3-epi-betulinic acid (15) (displacement ellipsoids are drawn at the 50% probability level).
A hybrid chemical-biological approach can upcycle mixed plastic waste with reduced cost and carbon footprint
<p>Derived from renewable feedstocks, such as biomass, polylactic acid (PLA) is considered a more environmentally-friendly plastic than conventional petroleum-based polyethylene terephthalate (PET). However, PLA must still be recycled and its growing popularity and mixture with PET plastics at the disposal stage poses a cross-contamination threat in existing recycling facilities and results in low-value and low-quality recycled products. Hybrid upcycling has been proposed as a promising sustainable solution for mixed plastic waste; but its techno-economic and lifecycle environmental performance remain understudied. Here we propose a hybrid upcycling approach using a biocompatible ionic liquid (IL) to first chemically depolymerize plastics, then convert the depolymerized stream via biological upgrading with no extra separation. We show that over 95% of mixed PET/PLA was depolymerized into their respective monomers, which then served as the sole carbon source for the growth of <i>Pseudomonas putida</i>, enabling the conversion of the depolymerized plastics into biodegradable polyhydroxyalkanoates (PHA). In comparison to conventional commercial PHA, the estimated optimal production cost and carbon footprint are reduced by 62% and 29%, respectively.</p>
2022 Hydrological, chemical, and biological assessment of two New Mexico headwater streams
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Data from: Year-long monitoring of physico-chemical and biological variables provide a comparative baseline of coral reef functioning in the central Red Sea
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2024 Hydrological, chemical and biological assessment of two New Mexico headwater streams
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Biological and chemical data taken during a CO2 perturbation experiment with adult Antarctic krill, during a Palmer LTER cruise in January 2011
Ocean acidification has a wide-ranging potential for impacting the physiology and metabolism of zooplankton. Sufficiently elevated CO2 concentrations can alter internal acid-base balance, compromising homeostatic regulation and disrupting internal systems ranging from oxygen transport to ion balance. We assessed feeding and nutrient excretion rates in natural populations of the keystone species Euphausia superba (Antarctic krill) by conducting a CO2 perturbation experiment at ambient and elevated atmospheric CO2 levels in January 2011 along the West Antarctic Peninsula (WAP). Under elevated CO2 conditions (~672 ppm), ingestion rates of krill averaged 78 µg C individual-1 d-1 and were 3.5 times higher than krill ingestion rates at ambient, present day CO2 concentrations. Additionally, rates of ammonium, phosphate, and dissolved organic carbon (DOC) excretion by krill were 1.5, 1.5, and 3.0 times higher, respectively, in the high CO2 treatment than at ambient CO2 concentrations. Excretion of urea, however, was ~17% lower in the high CO2 treatment, suggesting differences in catabolic processes of krill between treatments. Activities of key metabolic enzymes, malate dehydrogenase (MDH) and lactate dehydrogenase (LDH), were consistently higher in the high CO2 treatment. The observed shifts in metabolism are consistent with increased physiological costs associated with regulating internal acid-base equilibria. This represents an additional stress that may hamper growth and reproduction, which would negatively impact an already declining krill population along the WAP. (see full publication: Saba GK, Schofield O, Torres JJ, Ombres EH, Steinberg DK (2012) Increased Feeding and Nutrient Excretion of Adult Antarctic Krill, Euphausia superba, Exposed to Enhanced Carbon Dioxide (CO2). PLoS ONE 7(12): e52224. doi:10.1371/journal.pone.0052224)
Figure 2 in Interaction between biological aspects of Tetranychus urticae Koch (Acari: Tetranychidae) and some chemical composition in two colored Acalypha wilkesiana Müll. Arg. (Malpighiales: Euphorbiaceae) leaves
Figure 2. Graph of Pearson's correlation analysis among the different studied leaf parameters including the chemical analysis of Acalypha leaves and the T. urticae male characteristics. The colors represent variations in the obtained data. * indicates the significant at P-value <0.05.
Fig. 5. 1H–1H in Chemical and biological studies of Daphniphyllum oldhamii from Hunan Province, China
Fig. 5. 1H–1H COSY, key HMBC and NOESY correlations of 3.
Fig. 4 in Chemical constituents from the stems of Dendrobium gratiosissimum and their biological activities
Fig. 4. Experimental and calculated ECD of representative compounds.
Fig. 1 in Chemical constituents from the stems of Dendrobium gratiosissimum and their biological activities
Fig. 1. Structures of compounds (±)-1–10 and 11–15.
Fig. 8. 1 H– 1 H in Chemical and biological studies of Daphniphyllum oldhamii from Hunan Province, China
Fig. 8. 1 H– 1 H COSY, key HMBC and NOESY correlations of 13.
Fig. 4. 1H–1H in Chemical and biological studies of Daphniphyllum oldhamii from Hunan Province, China
Fig. 4. 1H–1H COSY, key HMBC and NOESY correlations of 2.
Fig. 3. X in Chemical constituents from the stems of Dendrobium gratiosissimum and their biological activities
Fig. 3. X-ray crystal structures of 1 and 15.
Fig. 7. 1H–1H in Chemical and biological studies of Daphniphyllum oldhamii from Hunan Province, China
Fig. 7. 1H–1H COSY, key HMBC and NOESY correlations of 12.
Fig. 1 in Chemical and biological studies of Daphniphyllum oldhamii from Hunan Province, China
Fig. 1. The structures of compounds 1–20.
Fig. 6. 1H–1H in Chemical and biological studies of Daphniphyllum oldhamii from Hunan Province, China
Fig. 6. 1H–1H COSY, key HMBC and NOESY correlations of 11.
Fig. 2. Key HMBC, 1H–1H in Chemical constituents from the stems of Dendrobium gratiosissimum and their biological activities
Fig. 2. Key HMBC, 1H–1H COSY and NOE correlations of representative compounds.
Fig. 3. ORTEP drawing for 3 in Chemical constituents and their biological activities from the mushroom Pyropolyporus fomentarius
Fig. 3. ORTEP drawing for 3 showing the absolute configuration.
Fig. 4. ORTEP drawing for 4 in Chemical constituents and their biological activities from the mushroom Pyropolyporus fomentarius
Fig. 4. ORTEP drawing for 4 showing the absolute configuration.
Fig. 2. Key 2D in Chemical constituents and their biological activities from the mushroom Pyropolyporus fomentarius
Fig. 2. Key 2D NMR correlations of 1, 3, and 4.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.