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Search results for: Androst-4-ene-3,17-dion-19-oic Acid Discontinued C19H24O4 CAS: 4757-95-3

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#33984647   2021/04/26 To Up

Detailed structural characterization of cardiolipins from various biological sources using a complex analytical strategy comprising fractionation, hydrolysis and chiral chromatography.

Cardiolipins (1,3-bis(sn-3'-phosphatidyl)-sn-glycerol) (CLs) are widespread in many organisms, from bacteria to higher green plants and mammals. CLs were observed in Gram-positive bacterium of the genus Kocuria, brewer's yeast Saccharomyces, the green alga Chlamydomonas, spinach and beef heart. A mixture of molecular species of CLs was obtained from total lipids by hydrophilic interaction liquid chromatography (HILIC), and these were further separated and identified by reversed phase LC/MS with negative tandem electrospray ionization. The majority of CLs molecular species from each organism were cleaved using phospholipase C from Bacillus cereus. This phospholipase cleaves CLs into 1,2-diglycerols and phosphatidylglycerol 3-phosphates, which were then separated. After CLs cleavage, diacylglycerols such as sn-1,2-diacyl-3-acetyl-glycerols (i.e., triacylglycerols) were separated and identified by chiral chromatography/MS-positive tandem ESI. Significant differences in the composition of the molecular species between the 3-(3-sn-phosphatidyl) and 1-(3-sn-phosphatidyl) moieties of CLs were found in all organisms tested. Molecular species of CLs that contained four different fatty acids were identified in all five samples, and CLs containing very long chain fatty acids were identified in yeast. In addition, CLs containing both enantiomers (at the sn-2 carbon) were present in the bacterium tested. These findings were further supported by data already published in GenBank where, in the same family - Micrococcaceae - both enzymes responsible for chirality in the sn-2 position, glycerol-3-phosphate and glycerol-1-phosphate dehydrogenases, were present.
Milada Vítová, Milena Stránská, Andrea Palyzová, Tomáš Řezanka

1782 related Products with: Detailed structural characterization of cardiolipins from various biological sources using a complex analytical strategy comprising fractionation, hydrolysis and chiral chromatography.

10 ug100ul100 assays 5 G 5 G25 mg50 ul0.2 mg 5 G96 wells (1 kit)25 assays

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#33984618   2021/05/09 To Up

Convergent validity of the Chinese version of the Multidimensional Schizotypy Scale.

Schizotypy is the latent personality reflecting the liability to schizophrenia. The Multidimensional Schizotypy Scale (MSS) is a newly developed questionnaire to measure the levels of schizotypy. The Chinese version of MSS has been developed and previous findings supported its structure validity. The present study aimed to examine the construct validity of the Chinese version of the MSS by correlating it with the Schizotypal Personality Questionnaire (SPQ). A total of 1359 university students completed the MSS and the SPQ online. The results of 1027 valid participants demonstrated that all MSS dimensions showed good internal consistency. The MSS positive dimension is strongly correlated with SPQ cognitive-perceptual factor, the MSS negative dimension with the SPQ interpersonal factor, and the MSS disorganized dimension with the SPQ disorganized factor. Taken together, our study provides evidence for construct validity of the Chinese version of the MSS.
Ya Wang, Hui-Xin Hu, Ling-Ling Wang, Yi-Jing Zhang, Han-Xue Yang, Han-Yu Zhou, Xu Li, Simon S Y Lui, Raymond C K Chan

2808 related Products with: Convergent validity of the Chinese version of the Multidimensional Schizotypy Scale.

500IU1min 2 cartons100.00 ul200 units11 ml500 Units

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#33984608   2021/05/02 To Up

Biochemical and metabolic responses of the deep-sea mussel Bathymodiolus platifrons to cadmium and copper exposure.

Greater interest in commercial deep-sea mining has been accompanied by mounting environmental concerns, including metal contamination resulting from mining activities. However, little is known about the toxic effects of metal exposure on deep-sea life. Given its ability to accumulate metals from the surrounding environment, its wide distribution at both vents and seeps, and its high abundance, the deep-sea mussel Bathymodiolus platifrons could serve as an ideal model to investigate the toxicological responses of deep-sea organisms to metal exposure. Here, we evaluated metal accumulation, traditional metal-related biomarkers, namely acid phosphatase (ACP), alkaline phosphatase (AKP), superoxide dismutase, catalase, reduced glutathione, metallothioneins, and malondialdehyde, as well as metabolic profiles in the gills of B. platifrons after a 7-day exposure to copper (100 μg/L), cadmium (500 μg/L), or copper-plus-cadmium treatments (100 μg/L Cu and 500 μg/L Cd). Metal exposure concentrations selected in this study can be found in deep-sea hydrothermal environments. Metal exposure resulted in significant metal accumulation in the gills of the mussel, indicating that B. platifrons has promise for use as an indicator of deep-sea metal pollution levels. Traditional biomarkers (AKP, ACP, and measured antioxidants) revealed cellular injury and oxidative stress in mussels following metal exposure. Metabolic responses in the three treatment groups indicated that metal exposure perturbed osmoregulation, energy metabolism, and nucleotide metabolism in mussels, in a response marked by differentially altered levels of amino acids, hypotaurine, betaine, succinate, glucose 6-phosphate, fructose 6-phosphate, guanosine, guanosine 5'-monophosphate, and inosine. Nevertheless, several uniquely altered metabolites were found in each treatment exposure group, suggesting dissimilar modes of toxicity between the two metal types. In the Cd-exposed group, the monosaccharide D-allose, which is involved in suppressing mitochondrial ROS production, was downregulated, a response consistent with oxidative stress in Cd-exposed B. platifrons. In the Cu-exposed group, the detected alterations in dopamine, dopamine-related, and serotonin-related metabolites together suggest disturbed neurotransmission in Cu-exposed B. platifrons. In the Cu-plus-Cd group, we detected a decline in fatty acid levels, implying that exposure to both metals jointly exerted a negative influence on the physiological functioning of the mussel. To the best of our knowledge, this is the first study to investigate changes in metabolite profiles in Bathymodiolus mussels exposed to metal. The findings reported here advance our understanding of the adverse impact of metal exposure on deep-sea life and can inform deep-sea mining assessments through the use of multiple biomarkers.
Li Zhou, Mengna Li, Zhaoshan Zhong, Hao Chen, Xiaocheng Wang, Minxiao Wang, Zheng Xu, Lei Cao, Chao Lian, Huan Zhang, Hao Wang, Yan Sun, Chaolun Li

2505 related Products with: Biochemical and metabolic responses of the deep-sea mussel Bathymodiolus platifrons to cadmium and copper exposure.

100 mg 25 MG100ul25 mg5mg1 ml200ug10 mg25 mg500 gm.1000 tests

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#33984436   2021/05/10 To Up

New sterols from the South China Sea sponges Halichondria sp.

A detailed chemical investigation of two specimen of South China Sea sponges Halichondria sp. (No. 19-XD-47 and No. 17-XD-87) have resulted in the isolation of three new sterols, namely, halichsterols A (1), B (2) and C (3), together with seven related known ones (4-10). Their structures were determined by extensive spectroscopic analysis and by comparison with the spectral data reported in the literature. In bioassay, compound 2 displayed significantly anti-inflammatory activity in lipopolysaccharide (LPS)-stimulated BV-2 microglial cells.
Bao Chen, Wang-Sheng Li, Yu-Cheng Gu, Hai-Yan Zhang, Hui Luo, Chang-Yun Wang, Yue-Wei Guo

1301 related Products with: New sterols from the South China Sea sponges Halichondria sp.

125 ml 10500 ml1000.1 mg 100 G1100 IU500 Units1mg

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#33984382   2021/05/10 To Up

Prolonged release and shelf-life of anticoagulant sulfated polysaccharides encapsulated with ZIF-8.

Natural active polysaccharides are attracting increased attention from pharmaceutical industries for their valuable biological activities. However, the application of polysaccharides has been restricted due to their relatively large molecular weight, complex structure, and instability. Metal-organic frameworks (MOFs) have emerged to help deliver cargo to specific locations, achieving the objectives of eliminating the potential damage to the body, protecting the drugs, and improving therapeutic effectiveness. Here, a pH-responsive zeolitic imidazolate framework (ZIF-8) was synthesized to encapsulated three sulfated polysaccharides (heparin, fucan sulfate, fucosylated chondroitin sulfate) and a non-sulfated polysaccharide, hyaluronic acid. The resulting [email protected] biocomposites showed differences in terms of morphology, particle size, encapsulation, and release efficiency. These biocomposites retained antithrombotic activity and the framework ZIF-8 effectively protected these polysaccharides from degradation and prolonged shelf-life of the anticoagulants from the unfavorable environment.
Jie Zheng, Bingzhi Li, Yuan Ji, Yin Chen, Xun Lv, Xing Zhang, Robert J Linhardt

2510 related Products with: Prolonged release and shelf-life of anticoagulant sulfated polysaccharides encapsulated with ZIF-8.

100tests100tests250tests100tests100tests10 mg100ug5/100 Packing /sleeve/bo500 MG100 rxns 25 mg1000 TESTS/0.65ml

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#33984278   2021/05/11 To Up

The ZAR1 resistosome is a calcium-permeable channel triggering plant immune signaling.

Nucleotide-binding, leucine-rich repeat receptors (NLRs) are major immune receptors in plants and animals. Upon activation, the Arabidopsis NLR protein ZAR1 forms a pentameric resistosome in vitro and triggers immune responses and cell death in plants. In this study, we employed single-molecule imaging to show that the activated ZAR1 protein can form pentameric complexes in the plasma membrane. The ZAR1 resistosome displayed ion channel activity in Xenopus oocytes in a manner dependent on a conserved acidic residue Glu11 situated in the channel pore. Pre-assembled ZAR1 resistosome was readily incorporated into planar lipid-bilayers and displayed calcium-permeable cation-selective channel activity. Furthermore, we show that activation of ZAR1 in the plant cell led to Glu11-dependent Ca influx, perturbation of subcellular structures, production of reactive oxygen species, and cell death. The results thus support that the ZAR1 resistosome acts as a calcium-permeable cation channel to trigger immunity and cell death.
Guozhi Bi, Min Su, Nan Li, Yu Liang, Song Dang, Jiachao Xu, Meijuan Hu, Jizong Wang, Minxia Zou, Yanan Deng, Qiyu Li, Shijia Huang, Jiejie Li, Jijie Chai, Kangmin He, Yu-Hang Chen, Jian-Min Zhou

2416 related Products with: The ZAR1 resistosome is a calcium-permeable channel triggering plant immune signaling.

100ul100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug100ug Lyophilized100ug Lyophilized100ug Lyophilized100ug Lyophilized

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#33984272   // To Up

CRISPR transposons on the move.

CRISPR transposons (CASTs) represent unique mobile genetic elements that co-opted CRISPR-Cas immune systems for RNA-guided DNA transposition. However, CAST-encoded CRISPR arrays rarely match the CAST's chromosomal location. A recent publication in Cell helps resolve this paradox by revealing CRISPR-array-independent mechanisms of chromosomal homing unique to different CAST types.
Ioannis Mougiakos, Chase L Beisel

1405 related Products with: CRISPR transposons on the move.

200 units 2 ml 1 100 G1 6 ml Ready-to-use 500 Units10 μg

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