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Biochemistry*

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https://www.readbyqxmd.com/read/28239424/non-covalent-interactions-in-controlling-ph-responsive-behaviors-of-self-assembled-nanosystems
#1
Yang Li, Zhaohui Wang, Qi Wei, Min Luo, Gang Huang, Baran D Sumer, Jinming Gao
Self-assembly and associated dynamic and reversible non-covalent interactions are the basis of protein biochemistry (e.g., protein folding) and development of sophisticated nanomaterial systems that can respond to and amplify biological signals. In this study, we report a systematic investigation of non-covalent interactions that affect the pH responsive behaviors and resulting supramolecular self-assembly of a series of ultra-pH sensitive (UPS) block copolymers. Increase of hydrophobic and π-π stacking interactions led to the decrease of pKa values...
October 14, 2016: Polymer Chemistry
https://www.readbyqxmd.com/read/28239191/the-rise-of-radicals-in-bioinorganic-chemistry
#2
Harry B Gray, Jay R Winkler
Prior to 1950, the consensus was that biological transformations occurred in two-electron steps, thereby avoiding the generation of free radicals. Dramatic advances in spectroscopy, biochemistry, and molecular biology have led to the realization that protein-based radicals participate in a vast array of vital biological mechanisms. Redox processes involving high-potential intermediates formed in reactions with O2 are particularly susceptible to radical formation. Clusters of tyrosine (Tyr) and tryptophan (Trp) residues have been found in many O2-reactive enzymes, raising the possibility that they play an antioxidant protective role...
October 2016: Israel Journal of Chemistry
https://www.readbyqxmd.com/read/28239024/in-practical-training-a-questionnaire-survey-and-analysis-to-pharmacy-students-of-the-utilization-situation-of-the-course-contents-of-pharmacy-school
#3
Masato Okubo, Yuka Takahashi, Jun Yamashita, Hideyo Takahashi, Okiko Miyata, Takaaki Suzuki, Itsuko Ishii
  Pharmacy education comprises basic pharmacy (organic chemistry, biochemistry, and physical chemistry) and applied pharmacy (clinical pharmacy, pharm aceutics, and chemical hygiene). Students are expected to apply these subjects studied in pharmacy school during their practical pharmacy training. However, knowledge gained in university does not appear to be fully utilized in practice. We hypothesized that this is due to a lack of connection between pre-practical training education and actual practical training...
February 24, 2017: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/28238854/use-of-a-probabilistic-pbpk-pd-model-to-calculate-data-derived-extrapolation-factors-for-chlorpyrifos
#4
Torka S Poet, Charles Timchalk, Michael J Bartels, Jordan N Smith, Robin McDougal, Daland R Juberg, Paul S Price
A physiologically based pharmacokinetic and pharmacodynamic (PBPK/PD) model combined with Monte Carlo analysis of inter-individual variation was used to assess the effects of the insecticide, chlorpyrifos and its active metabolite, chlorpyrifos oxon in humans. The PBPK/PD model has previously been validated and used to describe physiological changes in typical individuals as they grow from birth to adulthood. This model was updated to include physiological and metabolic changes that occur with pregnancy. The model was then used to assess the impact of inter-individual variability in physiology and biochemistry on predictions of internal dose metrics and quantitatively assess the impact of major sources of parameter uncertainty and biological diversity on the pharmacodynamics of red blood cell acetylcholinesterase inhibition...
February 23, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28238812/platelet-count-may-impact-on-lysosomal-acid-lipase-activity-determination-in-dried-blood-spot
#5
Umberto Vespasiani Gentilucci, Jessica D'Amico, Antonio De Vincentis, Giulia Tozzi, Ferruccio Vorini, Paolo Gallo, Simone Carotti, Francesco Valentini, Giovanni Galati, Chiara dell'Unto, Fiorella Piemonte, Antonio Picardi
BACKGROUND: We aimed to evaluate the influence of white blood cell (WBC) and platelet (PLT) counts on dried blood spot (DBS)-determined lysosomal acid lipase (LAL) activity in a large group of healthy subjects. METHODS: One-hundred-and-seventy-two healthy subjects aged ≥18 were enrolled. Complete clinical biochemistry and LAL activity in DBS were determined. In 35 subjects, WBCs and PLTs were isolated, and LAL activity was measured in both blood cell populations...
February 23, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28238769/effects-of-raloxifene-on-portal-hypertension-and-hepatic-encephalopathy-in-cirrhotic-rats
#6
Ching-Chih Chang, Wen-Shin Lee, Chiao-Lin Chuang, I-Fang Hsin, Shao-Jung Hsu, Ting Chang, Hui-Chun Huang, Fa-Yauh Lee, Shou-Dong Lee
Raloxifene, a selective estrogen receptor modulator, has been used extensively for osteoporosis. In addition to the effect of osteoporosis treatment, emerging evidences show that raloxifene affects the vascular function in different tissues. Cirrhosis is characterized with portal hypertension and complicated with hepatic encephalopathy. Portal hypertension affects portal-systemic shunt which leads to hepatic encephalopathy that the vascular modulation might influence severity of hepatic encephalopathy. Herein, we evaluated the impact of raloxifene on bile duct ligation (BDL)-induced cirrhotic rats...
February 23, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28238733/fragmentation-of-the-crispr-cas-type-i-b-signature-protein-cas8b
#7
Hagen Richter, Judith Rompf, Julia Wiegel, Kristina Rau, Lennart Randau
BACKGROUND: CRISPR arrays are transcribed into long precursor RNA species, which are further processed into mature CRISPR RNAs (crRNAs). Cas proteins utilize these crRNAs, which contain spacer sequences that can be derived from mobile genetic elements, to mediate immunity during a reoccurring virus infection. Type I CRISPR-Cas systems are defined by the presence of different Cascade interference complexes containing large and small subunits that play major roles during target DNA selection...
February 23, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28238650/which-patients-discontinue-issues-on-levodopa-carbidopa-intestinal-gel-treatment-italian-multicentre-survey-of-905-patients-with-long-term-follow-up
#8
Mariachiara Sensi, Giovanni Cossu, Francesca Mancini, Manuela Pilleri, Maurizio Zibetti, Nicola Modugno, Rocco Quatrale, Filippo Tamma, Angelo Antonini
OBJECTIVES: To report the results of a national survey aimed at quantifying the current level of diffusion of Levodopa/carbidopa intestinal gel (LCIG) in Italy. METHODS: Sixty Parkinson's Disease (PD) specialists in Italy were invited to complete a survey covering issues on clinical and practical aspects of LCIG therapy. RESULTS: Clinical features of 905 patients were collected retrospectively. The majority of centres reported the use of a multidisciplinary team, biochemistry testing, neurophysiological and neuropsychological tests before and after treatment, in addition to caregivers' training and patient's follow as outpatients...
February 21, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/28238183/associations-between-trace-elements-and-clinical-health-parameters-in-the-north-pacific-loggerhead-sea-turtle-caretta-caretta-from-baja-california-sur-mexico
#9
César Paúl Ley-Quiñónez, Natalia Alejandra Rossi-Lafferriere, Teresa Leticia Espinoza-Carreon, Catherine Edwina Hart, Sherwood Hoyt Peckham, Alfredo Alonso Aguirre, Alan Alfredo Zavala-Norzagaray
This study investigated selected trace elements toxicity in sea turtles Caretta caretta population from Baja California Sur (BCS), Mexico, by analyzing associations among Zn, Se, Cu, As, Cd, Ni, Mn, Pb, and Hg with various biochemical parameters (packed cell volume, leukocytes, and selected blood parameters), and whether their concentrations could have an impact on the health status of sea turtles. Blood samples from 22 loggerhead (C. caretta) sea turtles from BCS, Mexico, were collected for trace elements on biochemistry parameter analyses...
February 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28237774/identification-of-urine-tauro-%C3%AE-muricholic-acid-as-a-promising-biomarker-in-polygoni-multiflori-radix-induced-hepatotoxicity-by-targeted-metabolomics-of-bile-acids
#10
Dong-Sheng Zhao, Li-Long Jiang, Ya-Xi Fan, Lei-Chi Dong, Jiang Ma, Xin Dong, Xiao-Jun Xu, Ping Li, Hui-Jun Li
Polygoni Multiflori Radix (PMR) has been widely used as a tonic for centuries. However, hepatotoxicity cases linked to PMR have been frequently reported and appropriate biomarkers for clinical diagnosis are currently lacking. Here, an approach using UPLC-QqQ/MS-based targeted metabolomics of bile acids (BAs) complemented with biochemistry and histopathology was applied to characterize the development and recovery processes of PMR-induced hepatotoxicity in rats and to identify biomarkers. The expression of bile salt export pump (Bsep) and sodium taurocholate cotransporting polypeptide (Ntcp) were evaluated to investigate the underlying mechanism...
February 22, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28235386/characteristics-of-ci-children-with-complicated-middle-ear-infections
#11
Søren Hoberg, Christian Danstrup, Bjarke Laursen, Niels Krintel Petersen, Nichlas Udholm, Gintaras Audrius Kamarauskas, Therese Ovesen
OBJECTIVE: To describe cases of complicated middle ear infections in children with cochlear implants (CI), i.e., episodes of acute otitis media (AOM) and acute mastoiditis (AM), resulting in hospitalization. METHODS: A total of 206 children under 16 years (300 implantations) were implanted between 1 January 2008 and 31 December 2014 at the West Danish CI Center, Department of Otorhinolaryngology Head and Neck Surgery, Aarhus, Denmark. By means of two prospective local databases, episodes of AOM or AM and demographics were retrieved including biochemistry, microbiology, length of follow- up, and variable treatment modalities (intravenous (IV) antibiotics, revision mastoidectomy, and insertion of ventilation tubes)...
February 24, 2017: Cochlear Implants International
https://www.readbyqxmd.com/read/28231659/-correlative-factors-on-prevalence-rate-of-dislipidemia-among-1-337-coal-miners-in-shanxi-province
#12
Z D Fu, D D Wen, B Wang, S L Xue, G S Liu, X H Li, Z H Zhao, J Wang, B G Wei, S P Wang
Objective: To understand the prevalence rate and correlative factors of dislipidemia among Shanxi coal miners and to provide evidence for the development of programs on dislipidemia prevention. Methods: We investigated 1 337 mine workers from a Coal Group in April 2016 and collected data related to their blood biochemistry. We then classified the types in accordance with the diagnostic criteria of " Guidelines for prevention and treatment of dyslipidemia in Chinese adults (2007)" , using χ(2) test and unconditional logistic regression model for analysis...
February 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28231411/guanidinium-group-is-protonated-in-a-strongly-basic-arginine-solution
#13
Bo Xu, Michael I Jacobs, Oleg Kostko, Musahid Ahmed
Knowledge of the acid dissociation constant of an amino acid has very important ramifications in the biochemistry of proteins and lipid bilayers in aqueous environments since charge and proton transfer depend on its value. The acid dissociation constant for the guanidinium group in arginine has historically been posited as 12.5, but there is substantial variation in published values over the years. Recent experiments suggest that the dissociation constant for arginine is much higher than 12.5, which explains why the arginine guanidinium group retains its positive charge under all physiological conditions...
February 23, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28231032/effects-of-live-trapping-and-isoflurane-anesthesia-on-free-ranging-american-martens-martes-americana
#14
Maria C Spriggs, Lisa I Muller, Paul Keenlance, Robert L Sanders, Jill C Witt, Debra L Miller
Seventy-two free-ranging American martens ( Martes americana ) in Michigan were immobilized using isoflurane from 2011 to 2015. In total, 129 anesthetic procedures were performed with no mortalities. Hypothermia and hyperthermia were the most common anesthetic complications, and the mean rectal temperatures were significantly higher during summer than in winter. Dental abnormalities were common; the majority of abnormal findings were broken or discolored teeth attributed to previous dental trauma and were not trap-induced...
February 23, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28230335/undergraduate-medical-academic-performance-is-improved-by-scientific-training
#15
Lili Zhang, Wei Zhang, Chong Wu, Zhongming Liu, Yunfei Cai, Xingguo Cao, Yushan He, Guoxiang Liu, Hongming Miao
The effect of scientific training on course learning in undergraduates is still controversial. In this study, we investigated the academic performance of undergraduate students with and without scientific training. The results show that scientific training improves students' test scores in general medical courses, such as biochemistry and molecular biology, cell biology, physiology, and even English. We classified scientific training into four levels. We found that literature reading could significantly improve students' test scores in general courses...
February 23, 2017: Biochemistry and Molecular Biology Education
https://www.readbyqxmd.com/read/28230314/approaches-to-enhance-the-teaching-quality-of-experimental-biochemistry-for-mbbs-students-in-tsmu-china
#16
Lijuan Yu, Shuying Yi, Jing Zhai, Zhaojin Wang
With the internationalization of medical education in China, the importance of international students' education in medical schools is also increasing. Except foreign students majoring in Chinese language, English Bachelor of Medicine, Bachelor of Surgery (MBSS) students are the largest group of international students. Based on problems in the teaching process for experimental biochemistry, we designed teaching models adapted to the background of international students and strengthened teachers' teaching ability at Taishan Medical University...
February 23, 2017: Biochemistry and Molecular Biology Education
https://www.readbyqxmd.com/read/28229928/an-expanded-genetic-code-for-probing-the-role-of-electrostatics-in-enzyme-catalysis-by-vibrational-stark-spectroscopy
#17
REVIEW
Jan-Stefan Völler, Hernan Biava, Peter Hildebrandt, Nediljko Budisa
BACKGROUND: To find experimental validation for electrostatic interactions essential for catalytic reactions represents a challenge due to practical limitations in assessing electric fields within protein structures. SCOPE OF REVIEW: This review examines the applications of non-canonical amino acids (ncAAs) as genetically encoded probes for studying the role of electrostatic interactions in enzyme catalysis. MAJOR CONCLUSIONS: ncAAs constitute sensitive spectroscopic probes to detect local electric fields by exploiting the vibrational Stark effect (VSE) and thus have the potential to map the protein electrostatics...
February 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28229590/impacts-of-crosslinkers-on-biological-effects-of-mesoporous-silica-nanoparticles
#18
Yi-Ping Chen, Si-Han Wu, I-Chih Chen, Chien-Tsu Chen
Chemically synthesized crosslinkers play decisive roles in variable cargos attached to nanoparticles (NPs). Previous studies reported that surface properties, such as the size, charge, and surface chemistry, are particularly important determinants influencing the biological fate and actions of NPs and cells. Recent studies also focused on the relationship of serum proteins with the surface properties of NPs (also called the protein corona), which is recognized as a key factor in determining the cytotoxicity and biodistribution...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28226215/multiple-functions-and-regulation-of-mammalian-peroxiredoxins
#19
Sue Goo Rhee, In Sup Kil
Peroxiredoxins (Prxs) constitute a major family of peroxidases, with mammalian cells expressing six Prx isoforms (PrxI to PrxVI). Cells produce hydrogen peroxide (H2O2) at various intracellular locations where it can serve as a signaling molecule. Given that Prxs are abundant and possess a structure that renders the cysteine (Cys) residue at the active site highly sensitive to oxidation by H2O2, the signaling function of this oxidant requires extensive and highly localized regulation. Recent findings on the reversible regulation of PrxI through phosphorylation at the centrosome and on the hyperoxidation of the Cys at the active site of PrxIII in mitochondria are described in this review as examples of such local regulation of H2O2 signaling...
February 2, 2017: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/28225758/biochemistry-origin-of-a-key-player-in-methane-biosynthesis
#20
Tadhg P Begley
No abstract text is available yet for this article.
February 22, 2017: Nature
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