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Neutral 4π-electron tetrasilacyclobutadiene contains unusual features of a Möbius-type aromatic ring.
Commun Chem
December 2024
Anorganische Chemie, Universität Göttingen, Göttingen, Germany.
The search for stable compounds containing an antiaromatic cyclic 4π system is a challenge for inventive chemists that can look back on a long history. Here we report the isolation and characterization of the novel 4π-electron tetrasilacyclobutadiene, an analogue of a 4π neutral cyclobutadiene that exhibits surprising features of a Möbius-type aromatic ring. Reduction of RSiCl (R = (Pr)PCH) with KC in the presence of cycloalkyl amino-carbene (cAAC) led to the formation of corresponding silylene 1.
View Article and Find Full Text PDFPigment granule architecture varies across yellow, red, and brown chromatophores in squid Doryteuthis pealeii.
Sci Rep
December 2024
Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, 02115, USA.
Cephalopods produce dynamic colors and skin patterns for communication and camouflage via stratified networks of neuronally actuated yellow, red, and brown chromatophore organs, each filled with thousands of pigment granules. While compositional analysis of chromatophore granules in Doryteuthis pealeii reveals the pigments as ommochromes, the ultrastructural features of the granules and their effects on bulk coloration have not been explored. To investigate this, we isolated granules from specific colored chromatophores and imaged them using multiple modalities.
View Article and Find Full Text PDFCharacterization of a novel acidic phospholipase A isolated from the venom of Bothrops mattogrossensis: From purification to structural modeling.
Int J Biol Macromol
December 2024
Laboratory of Cellular Immunology Applied to Health, Oswaldo Cruz Foundation, FIOCRUZ Rondônia, Porto Velho, RO, Brazil; Department of Medicine, Federal University of Rondonia (UNIR), Porto Velho, RO, Brazil. Electronic address:
Phospholipases A (PLAs) are highly prevalent in Bothrops snake venom and play a crucial role in inflammatory responses and immune cell activation during envenomation. Despite their significance, the specific role of PLAs from Bothrops mattogrossensis venom (BmV) in inflammation is not fully understood. This study sought to isolate and characterize a novel acidic PLA from BmV, designated BmPLA-A, and to evaluate its effects on human umbilical vein endothelial cells (HUVECs), with a specific focus on cytotoxicity, adhesion, and detachment.
View Article and Find Full Text PDFConstructing a green modifier by using glyoxal-urea resin and chitosan to obtain a modified soy protein adhesive with high bonding strength and excellent water resistance.
Int J Biol Macromol
December 2024
Yunnan Key Laboratory of Wood Adhesives and Glue Products, Southwest Forestry University, Kunming 650224, PR China; College of Materials and Chemical Engineering, Southwest Forestry University, Kunming 650224, PR China. Electronic address:
The manufacturing of soy-based adhesives with high bonding strength, excellent water resistance, and exceptional environmental performance still faces difficulties. In this work, using glyoxal-urea (GU) resin, chitosan (CS), and soy protein isolate (SPI) as the primary raw materials in order to effectively mitigate the release of free formaldehyde commonly found in traditional wood-based panels. Obtaining an adhesive with high strength, excellent water resistance, and a stable cross-linking structure of GU/CS/SPI (CS represents different mass fractions of chitosan solution).
View Article and Find Full Text PDFEnhancing toxicity prediction for natural products in herbal medicine and dietary supplements: Integrating (Q)STR models and in vitro assays.
Toxicol Appl Pharmacol
December 2024
Department of Predictive Toxicology, Korea Institute of Toxicology, 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea; Department of Human and Environmental Toxicology, University of Science and Technology, Daejeon, Republic of Korea; Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA, USA. Electronic address:
New approach methods (NAMs) are required to predict human toxicity effectively, particularly due to limitations in conducting in vivo studies. While NAMs have been established for various industries, such as cosmetics, pesticides, and drugs, their applications in natural products (NPs) are lacking. NPs' complexity (multiple ingredients and structural differences from synthetic compounds) complicates NAM development.
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