Results 21 to 30 of about 5,105,997 (296)

Synthesis of new annulated pyrano[2,3-d]pyrimidine derivatives using organo catalyst (DABCO) in aqueous media

Journal of Saudi Chemical Society, 2017
A selective method for the synthesis of annulated pyrano[2,3-d]pyrimidines has been developed. It was shown that base catalysis is more efficient in this reaction, rather than acid catalysis as it is believed that 1,4-diazabicyclo[2.2.2]octane (DABCO) is
Ajmal R. Bhat, Aabid H. Shalla, Rajendra S. Dongre   +2 more
doaj   +1 more source

YÜKSEK DERİŞİMDE FOSFORÖZ ASİTTEN POTASYUM FOSFİT TUZLARI ÜRETİMİNDE REAKTÖR İŞLETİM TÜRÜNÜN ETKİSİ

Eskişehir Osmangazi Üniversitesi Mühendislik ve Mimarlık Fakültesi Dergisi, 2021
In the production of potassium phosphite salts (monopotassium phosphite and dipotassium phosphite salts) formed as a result of the neutralization reaction of phosphorous acid and potassium hydroxide.
Zeynep YILMAZER HİTİT, Pınar AYGENER, Elçin Elmas AK, Kemal KESENCİ, Suna ERTUNÇ, Bülent AKAY   +5 more
doaj   +1 more source

Ultrasound-Assisted, Base-Catalyzed, Homogeneous Reaction for Ferulic Acid Production from γ-Oryzanol

Journal of Chemistry, 2018
A method for producing ferulic acid by ultrasound-assisted, homogeneous, base-catalyzed hydrolysis of γ-oryzanol was developed. Experiments were conducted using various reaction temperatures and ratios of γ-oryzanol to base catalyst in both homogeneous ...
Hoa Thi Truong, Manh Van Do, Long Duc Huynh, Linh Thi Nguyen, Anh Tuan Do, Thao Thanh Xuan Le, Hung Phuoc Duong, Norimichi Takenaka, Kiyoshi Imamura, Yasuaki Maeda   +9 more
doaj   +1 more source

Developing and evaluating a multiple-choice knowledge test about Brønsted-Lowry acid-base reactions for upper secondary school students

Chemistry Teacher International, 2023
For centuries, chemists have researched acid-base reactions and developing numerous different acid-base concepts. Consequentially, it is difficult to teach about acid-base reactions in a clear and conceptually coherent manner.
Krebs Rita Elisabeth, Rost Marvin, Lembens Anja   +2 more
doaj   +1 more source

Clinical Characteristics and Prognostic Risk Factors for Pediatric B‐Cell Lymphoblastic Lymphoma: A Multicenter Retrospective Cohort Study for China Net Childhood Lymphoma

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background B‐cell lymphoblastic lymphoma (B‐LBL) represents a rare variety of non‐Hodgkin lymphoma, with limited research on its biology, progression, and management. Methods A retrospective analysis was performed on the clinical characteristics of 256 patients aged ≤18 years who received treatment under the China Net Childhood Lymphoma (CNCL)‐
Zhijuan Liu, Jian Wang, Ling Jin, Yanlong Duan, Fu Li, Yueping Jia, Leping Zhang, Xiaojun Yuan, Wei Liu, Ying Liu, Ansheng Liu, Mincui Zheng, Yunpeng Dai, Lian Jiang, Lirong Sun, Xiaowen Zhai, Rong Liu, Chunju Zhou, Zifen Gao, Yonghong Zhang, Xiaomei Yang   +20 more
wiley   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Conversion of Cellobiose to Formic Acid as a Biomass‐Derived Renewable Hydrogen Source Using Solid Base Catalysts

ChemistryOpen
Formic acid is considered a promising hydrogen carrier. Biomass‐derived formic acid can be obtained by oxidative decomposition of sugars. This study explored the production of formic acid from cellobiose, a disaccharide consisting of d‐glucose linked by ...
Ikuto Yoshiki, Prof. Atsushi Takagaki, Dr. Jun Tae Song, Prof. Motonori Watanabe, Prof. Tatsumi Ishihara   +4 more
doaj   +1 more source

Comparison studies of propylene oxide addition to phenyloctadecanol and phenyloctadecanoic acid and the surface activity studies of their sulphated products

Grasas y Aceites, 2001
Phenyloctadecanol and phenyloctadecanoic acid were produced via Lewis acid catalyzed reaction of benzene and oleyl alcohol (60 ºC) or oleic acid at (80 ºC) respectively.
M. H.M. Ahmed
doaj   +1 more source

The Effects of Sodium Hydroxide (NaOH) Concentration and Reaction Temperature on The Properties of Biodiesel from Philippine Tung (Reutealis Trisperma) Seeds

Automotive Experiences, 2021
Philippine Tung (Reutealis trisperma) is an indigenous nut that is a relatively new feedstock for producing biodiesel in Indonesia. The nature of NaOH base catalyst and reaction temperature plays an important role in the method of biodiesel production ...
Slamet Supriyadi, Purwanto Purwanto, Didi Dwi Anggoro, Hermawan Hermawan   +3 more
doaj   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source