Results 61 to 70 of about 208,777 (323)

A Negatively Curved Pyrene‐Fused Azaacene

Angewandte Chemie, EarlyView.
A pyrene‐fused azaacene derivative is reported in which steric overcrowding caused by eight phenyl substituents induces bending of the aromatic framework rather than twisting. ABSTRACT Non‐planar aromatic hydrocarbons display distorted π‐frameworks that give rise to unique optoelectronic properties.
Marco Carini, Miguel Martín‐Arroyo, Manuel Melle‐Franco, Aurelio Mateo‐Alonso   +3 more
wiley   +2 more sources

Evaluation of polycyclic aromatic hydrocarbons using analytical methods, toxicology, and risk assessment research: seafood safety after a petroleum spill as an example. [PDF]

, 2014
BackgroundPolycyclic aromatic hydrocarbons (PAHs) are abundant and widespread environmental chemicals. They are produced naturally and through man-made processes, and they are common in organic media, including petroleum.
Ansari, Shakeel, Blake, Diane, Echsner, Stephen, Elferink, Cornelis, Fernando, Harshica, Frickel, Scott, Gauthe, David, Howard, Jessi, Kane, Andrew, Miller, Charles, Nguyen, Daniel, Overton, Edward, Simon, Bridget, Trapido, Edward, Wickliffe, Jeffrey, Wilson, Mark   +15 more
core   +1 more source

Production of lotion using neem (Azadirachta Indica A. Juss) extract [PDF]

, 2020
Nowadays, the most emerging disease which is arthropod borne disease cannot be prevented from vaccines and become a potential threat especially in tropical world such as America, Africa and Asia and has become a trend (Al-Hashemi et al., 2016; Biswas et ...
Ghazali, Norliza, Jaafar, Aina Syazwana, Mohd Fauzee, Nurfazlina Farisah, Mohd Fauzi, Farah Raihana   +3 more
core  

Chameleonic Color‐Variable Microbead Emitters for Multilevel Spectroscopic Encryption from Visible to Infrared Wavelengths

Advanced Optical Materials, EarlyView.
Whispering‐gallery‐mode microresonators with sharp resonant peaks enable photonic barcoding. Similar to a chameleon, a rare‐earth‐free microcavity with π‐conjugated PAHs enables visibleto‐near infrared color generation from a single microbead. The unique resonat emission (spectral barcode) can be dynamically transformed via excitation wavelength change,
Barun Kumar Barman, Keisuke Watanabe, Kenzo Deguchi, Shinobu Ohki, Kenjiro Hashi, Atsushi Goto, Tadaaki Nagao   +6 more
wiley   +1 more source

Iterative Synthesis of Pentacene Derivatives with Continuous Boron–Oxygen Bonds

Angewandte Chemie, EarlyView.
An iterative synthetic strategy enables the controlled introduction of continuous multiple B–O bonds at the zigzag edge of acenes. A simple two‐step cycle—ipso iodination and Suzuki cross‐coupling/condensation—efficiently constructs BO‐acenes ranging from naphthalene to pentacene.
Seonghwa Jeong, Si‐In Kim, Jonghwan Lee, Hwon Kim, Jinuk Jang, Jiyeon Kim, Wonyoung Choe, Seung Kyu Min, Young S. Park   +8 more
wiley   +2 more sources

Zinc Exposure Causes Disulfidptosis to Induce Miscarriage by Up‐Regulating GATA1/METTL1/SLC7A11 Axis

Advanced Science, EarlyView.
Zn exposure up‐regulates GATA1, promoting GATA1‐mediated METTL1 and SLC7A11 transcription. It also enhances METTL1‐mediated m7G modification on SLC7A11 mRNA, increasing SLC7A11 mRNA stability. Ultimately, Zn exposure up‐regulates SLC7A11 at both transcriptional and post‐transcriptional levels, causing disulfidptosis. Knockdown of murine Slc7a11, Gata1,
Wenxin Huang, Yi Sun, Yanxin Wang, Haijun Yan, Xiaoping Yue, Weidong Wu, Xueyu Chen, Jinfang Zhang, Yanbing Lin, Qiong Lei, Nan Ji, Shuaishuai Xing, Liqin Zeng, Qingzheng Kang, Depeng Zhao, Geng Guo, Huidong Zhang   +16 more
wiley   +1 more source

Ring‐Opening Arylation of Cyclic Diaryliodoniums via Cyclic Triaryliodanes as Aryne Precursors and Dynamic Aryl Reservoirs

Angewandte Chemie, EarlyView.
Cyclic diaryliodonium salts engage aryl Grignard reagents to trigger a self‐propagating aryne–arylation cycle. Transient cyclic triaryliodanes serve as aryne precursors and dynamic aryl reservoirs, delivering iodine‐capped teraryls with predominant meta‐selectivity. The preserved C─I bond enables outward π‐extension or inward recyclization.
Daichi Ikeshita, Mao Atarashi, Naohiko Yoshikai   +2 more
wiley   +2 more sources

Surgical smoke-related occupational injuries among medical professionals in the operating room

Journal of International Medical Research
Objective The use of energy devices during surgery can cause the spread of surgical smoke into the operating room. The concentration of smoke particles during laparoscopic surgery is higher than that during open surgery.
Chen Fengxia, Dexiang Jin, Ailing Lian
doaj   +1 more source

Chemical characterization of liquefaction products of an inertinite enriched northern Alaska coals [PDF]

, 1989
A Northern Alaskan coal rich in inertinites was further enriched by density gradient separations. The degree of condensation of the enriched coal was estimated to be low, mainly 3 ring.
Mayasandra, Venugopal
core  

Polycyclic aromatic hydrocarbon exposure and pediatric asthma in children: a case–control study

Environmental Health, 2013
BackgroundBronchial asthma is one of the most prevalent diseases in Arab children. Environmental pollution has been suggested to be considered causative of asthma, nasal symptoms and bronchitis in both children and adult.
N. Al-Daghri, M. Alokail, Sherif H. Abd-Alrahman, H. Draz, S. Yakout, M. Clerici   +5 more
semanticscholar   +1 more source