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Biochemistry*

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https://www.readbyqxmd.com/read/29150559/a-program-for-iron-economy-during-deficiency-targets-specific-fe-proteins
#1
Laura J Hantzis, Gretchen E Kroh, Courtney E Jahn, Michael Cantrell, Graham Peers, Marinus Pilon, Karl Ravet
Iron (Fe) is an essential element for plants, utilized in nearly every cellular process. Because the adjustment of uptake under Fe limitation cannot satisfy all demands, plants need to acclimate their physiology and biochemistry, especially in their chloroplasts, which have a high demand for Fe. To investigate if a program exists for the utilization of Fe under deficiency, we analyzed how hydroponically grown Arabidopsis thaliana adjusts its physiology and Fe protein composition in vegetative photosynthetic tissue, during Fe deficiency...
November 17, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29150272/proposed-biochemistry-of-parkinson-s-and-alzheimer-s-diseases
#2
D S Robertson
The formation of brain compounds linked to Parkinson's and Alzheimer's brain diseases are described. Metabolic mechanisms involved in the control of reacting biochemicals are detailed. Relationships are established between the biochemical reactions, biochemical control mechanisms and the onset of Parkinson's, Alzheimer's. Treatments based on these relationships are proposed.
November 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/29149556/evaluating-force-field-london-dispersion-coefficients-using-the-exchange-hole-dipole-moment-model
#3
Mohamad Mohebifar, Erin R Johnson, Christopher N Rowley
London dispersion interactions play an integral role in materials science and biophysics. Force fields for atomistic molecular simulations typically represent dispersion interactions by the 12-6 Lennard-Jones potential, using empirically-determined parameters. These parameters are generally underdetermined and there is no straightforward way to test if they are physically realistic. Alternatively, the exchange-hole dipole moment (XDM) model from density-functional theory predicts atomic and molecular London dispersion coefficients from first principles, providing an innovative strategy to validate the dispersion terms of molecular-mechanical force fields...
November 17, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29149477/pathfinders-in-oncology-from-the-beginning-of-the-19th-century-to-the-inauguration-of-the-first-cancer-hospital-in-the-united-states
#4
Steven I Hajdu
The fields of medicine and oncology made substantial progress between 1800 and 1885. The first half of this period was dominated by the spectacular progress in physiology, cytology, histology, histopathology, and diagnostic microscopy. In the second half of the period, advancements in surgical techniques, anesthesia, asepsis, and laboratory medicine, including bacteriology, chemistry, and biochemistry, led to the development of medical specialties, including surgical pathology and surgical oncology. Although wars, revolutions, and socioeconomic upheavals interrupted the daily life of the populace, distinguished artists, scientists, and physicians continued, against all odds, to advance their field of interest...
November 17, 2017: Cancer
https://www.readbyqxmd.com/read/29148316/recognition-dynamics-of-trinuclear-copper-cluster-and-associated-histidine-residues-through-conserved-or-semi-conserved-water-molecules-in-human-ceruloplasmin-the-involvement-of-aspartic-and-glutamic-acid-gates
#5
Bishnu Prasad Mukhopadhyay
Human Ceruloplasmin belongs to the family of multi-copper oxidases and it is involved in different physiological processes, copper ion transport, iron metabolism, iron homeostasis, and biogenic amine metabolism. MD-simulation studies have indicated the higher hydrophilic susceptibility of the trinuclear copper cluster in native CP compared to its oxygen bound form. The copper (T2/T3) atom Cu3047 of the cluster, which is close to T1 copper center Cu3052 (~13 Å) has a higher affinity for water molecules compared to other copper centers...
November 17, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29145976/not-only-p-glycoprotein-amplification-of-the-abcb1-containing-chromosome-region-7q21-confers-multidrug-resistance-upon-cancer-cells-by-coordinated-overexpression-of-an-assortment-of-resistance-related-proteins
#6
Ilaria Genovese, Andrea Ilari, Yehuda G Assaraf, Francesco Fazi, Gianni Colotti
The development of drug resistance continues to be a dominant hindrance toward curative cancer treatment. Overexpression of a wide-spectrum of ATP-dependent efflux pumps, and in particular of ABCB1 (P-glycoprotein or MDR1) is a well-known resistance mechanism for a plethora of cancer chemotherapeutics including for example taxenes, anthracyclines, Vinca alkaloids, and epipodopyllotoxins, demonstrated by a large array of published papers, both in tumor cell lines and in a variety of tumors, including various solid tumors and hematological malignancies...
May 2017: Drug Resistance Updates: Reviews and Commentaries in Antimicrobial and Anticancer Chemotherapy
https://www.readbyqxmd.com/read/29144467/progress-in-and-promise-of-bacterial-quorum-sensing-research
#7
Marvin Whiteley, Stephen P Diggle, E Peter Greenberg
This Review highlights how we can build upon the relatively new and rapidly developing field of research into bacterial quorum sensing (QS). We now have a depth of knowledge about how bacteria use QS signals to communicate with each other and to coordinate their activities. In recent years there have been extraordinary advances in our understanding of the genetics, genomics, biochemistry, and signal diversity of QS. We are beginning to understand the connections between QS and bacterial sociality. This foundation places us at the beginning of a new era in which researchers will be able to work towards new medicines to treat devastating infectious diseases, and use bacteria to understand the biology of sociality...
November 15, 2017: Nature
https://www.readbyqxmd.com/read/29144182/plasma-lyte-148-vs-hartmann-s-solution-for-cardiopulmonary-bypass-pump-prime-a-prospective-double-blind-randomized-trial
#8
Laurence Weinberg, Elizabeth Chiam, James Hooper, Frank Liskaser, Angela Kim Hawkins, Denise Massie, Andrew Ellis, Chong O Tan, David Story, Rinaldo Bellomo
BACKGROUND: The mechanisms of acid-base changes during cardiopulmonary bypass (CPB) remain unclear. We tested the hypothesis that, when used as CPB pump prime solutions, Plasma-Lyte 148 (PL) and Hartmann's solution (HS) have differential mechanisms of action in their contribution to acid-base changes. METHODS: We performed a prospective, double-blind, randomized trial in adult patients undergoing elective cardiac surgery with CPB. Participants received a CPB prime solution of 2000 mL, with either PL or HS...
November 1, 2017: Perfusion
https://www.readbyqxmd.com/read/29144123/the-sign-of-nmr-chemical-shift-difference-as-a-determinant-of-the-origin-of-binding-selectivity-elucidation-of-the-position-dependence-of-phosphorylation-in-ligands-binding-to-scribble-pdz1
#9
Gustav Sundell, Beat Vögeli, Ylva Ivarsson, Celestine Chi
The use of NMR chemical shift perturbation to monitor changes taking place around the binding site of a ligand-protein interaction is a routine and widely applied methodology in the field of protein biochemistry. Shifts are often acquired by titrating various concentrations of ligand to a fixed concentration of the receptor and may serve the purposes, amongst others, to determine affinity constants, locate binding surfaces, or differentiate between binding mechanisms. Shifts are quantified by the so-called combined chemical shift difference...
November 16, 2017: Biochemistry
https://www.readbyqxmd.com/read/29142565/correlation-between-hyperhomocysteinemia-and-common-carotid-artery-intima-media-thickness-in-carbamazepine-treated-epileptic-patients-using-ultrasonography
#10
Shazia Bano, Nudrat Anwar Zuberi, Syed Munawar Alam
Objective: The objective was to assess the role of homocysteine in the development of atherosclerosis in common carotid artery in the carbamazepine treated epileptic patients. Methods: This study was conducted in the Department of Biochemistry, Basic Medical Sciences Institute (BMSI), Jinnah Postgraduate Medical Center (JPMC), Karachi. Three hundred individuals, aged 34 ± 9.5 years were selected and divided into three groups. Each group comprised of 100 subjects labeled as Group-A (control group had healthy individuals), Group-B (newly diagnosed epileptic patients without antiepileptic therapy), Group-C (epileptic patients on Carbamazepine therapy, which was further subdivided into C-I having epileptic patients on Carbamazepine therapy less than 1 year n=33, C-II had epileptic patients on Carbamazepine therapy 1-2 years n = 33 and C-III comprised of epileptic patients on Carbamazepine therapy more than 2 years n = 34)...
September 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/29142244/body-size-phenotypes-comprehensively-assess-cardiometabolic-risk-and-refine-the-association-between-obesity-and-gut-microbiota
#11
J de la Cuesta-Zuluaga, V Corrales-Agudelo, J A Carmona, J M Abad, J S Escobar
BACKGROUND: The gut microbiota associates with obesity and related disorders, but recent meta-analyses have found that this association is, at best, of small effect. We argue that such analyses are flawed by the use of BMI as sole proxy for disease, and explore a classification method that distinguishes the cardiometabolic health status of individuals to look for more comprehensive associations between gut microbes and health. METHODS: We analyzed a 441 community-dwelling cohort on which we obtained demographic and health information, anthropometry and blood biochemistry data that served to categorize participants according to BMI, cardiometabolic health status and body size phenotypes...
November 16, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29141537/ophthalmic-applications-of-sln-and-nlc
#12
Neslihan Ustundag Okur, Evren Homan Gokce
BACKGROUND: The eyes are among the most readily accessible organs in terms of location in the body, yet drug delivery to eye tissues is particularly problematic. The anatomy, physiology and biochemistry of the eye limit the ophthalmic delivery of drugs. Numerous strategies in ophthalmic drug delivery have been made to expand the bioavailability and to prolong the remaining time of drugs treated topically to eye. METHODS: Designing a novel delivery vehicles that can proficiently target the diseased eye tissue, generate high drug levels, and keep sustained and effective concentrations with no or minimum side effects is the main concentration of present examination...
November 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29140587/comparison-of-haematology-and-biochemistry-parameters-in-healthy-south-african-infants-with-laboratory-reference-intervals
#13
B Schmidt, M Tameris, H Geldenhuys, A Luabeya, E Bunyasi, T Hawkridge, J B McClain, H Mahomed, T J Scriba, H McShane, M Hatherill
OBJECTIVE: Paediatric laboratory reference intervals used in Africa and Asia may be derived from historical intervals of predominantly Caucasian infants in Europe or North America. These intervals may therefore not be compatible with the range of normality for developing country populations. We aimed to compare haematology and biochemistry parameters in healthy South African infants with local laboratory reference intervals. METHODS: We compared the baseline haematology and biochemistry results of 634 (316 male and 318 female) HIV-unexposed infants, aged 3-6 months, living in a rural area of the Western Cape Province, South Africa, against laboratory reference intervals supplied by the South African National Health Laboratory Services (NHLS)...
November 15, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/29140435/hmdb-4-0-the-human-metabolome-database-for-2018
#14
David S Wishart, Yannick Djoumbou Feunang, Ana Marcu, An Chi Guo, Kevin Liang, Rosa Vázquez-Fresno, Tanvir Sajed, Daniel Johnson, Carin Li, Naama Karu, Zinat Sayeeda, Elvis Lo, Nazanin Assempour, Mark Berjanskii, Sandeep Singhal, David Arndt, Yonjie Liang, Hasan Badran, Jason Grant, Arnau Serra-Cayuela, Yifeng Liu, Rupa Mandal, Vanessa Neveu, Allison Pon, Craig Knox, Michael Wilson, Claudine Manach, Augustin Scalbert
The Human Metabolome Database or HMDB (www.hmdb.ca) is a web-enabled metabolomic database containing comprehensive information about human metabolites along with their biological roles, physiological concentrations, disease associations, chemical reactions, metabolic pathways, and reference spectra. First described in 2007, the HMDB is now considered the standard metabolomic resource for human metabolic studies. Over the past decade the HMDB has continued to grow and evolve in response to emerging needs for metabolomics researchers and continuing changes in web standards...
November 11, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29140140/the-physiological-mechanisms-of-effect-of-vitamins-and-amino-acids-on-tendon-and-muscle-healing-a-systematic-review
#15
Christopher Tack, Faye Shorthouse, Lindsy Kass
AIMS/OBJECTIVES: To evaluate current literature via systematic review to ascertain whether amino acids/ vitamins provide any influence on musculotendinous healing, and by which physiological mechanisms Methods: EBSCO, PUBMED, Science Direct, Embase Classic/ Embase, and MEDLINE were searched using terms including "vitamins", "amino acids", "healing", "muscle" and "tendon". The primary search had 479 citations, 466 of which were excluded predominantly due to non-randomised design. Randomised human and animal studies investigating all supplement types/ forms of administration were included...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29139345/herbicide-ingredients-change-salmonella-enterica-sv-typhimurium-and-escherichia-coli-antibiotic-responses
#16
Brigitta Kurenbach, Paddy S Gibson, Amy M Hill, Adam S Bitzer, Mark W Silby, William Godsoe, Jack A Heinemann
Herbicides are frequently released into both rural and urban environments. Commercial herbicide formulations induce adaptive changes in the way bacteria respond to antibiotics. Salmonella enterica sv. Typhimurium and Escherichia coli were exposed to common co-formulants of formulations, and S. enterica sv. Typhimurium was exposed to active ingredients dicamba, 2,4-D and glyphosate to determine what ingredients of the commercial formulations caused this effect. Co-formulants Tween80 and carboxymethyl cellulose induced changes in response, but the pattern of the responses differed from the active ingredients, and effect sizes were smaller...
November 17, 2017: Microbiology
https://www.readbyqxmd.com/read/29139142/safety-of-orally-administered-usp-compliant-levothyroxine-sodium-tablets-in-dogs
#17
J E Hare, C M K Morrow, J Caldwell, W E Lloyd
The safety of synthetic levothyroxine sodium tablets (Thyro-Tabs® Canine; LLOYD, Inc.) in dogs was evaluated in a randomized, sham-dose controlled, parallel-group study. Young, healthy, euthyroid Beagle dogs were randomized into four groups (four females and four males per group) and received single daily doses of 0×, 2× (0.044 mg/kg), 6× (0.132 mg/kg), or 10× (0.22 mg/kg) the labeled starting dose of 0.022 mg kg(-1)  day(-1) for 182 days. Every 2 weeks, physical examinations, electrocardiology examinations, and sample collections for thyroid panel, hematology, serum biochemistry, coagulation panel, and urinalysis were performed...
November 15, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29138805/extracellular-polysaccharides-purified-from-aureobasidium-pullulans-sm%C3%A2-2001-polycan-inhibit-dexamethasone%C3%A2-induced-muscle-atrophy-in-mice
#18
Jong-Min Lim, Young Joon Lee, Hyung-Rae Cho, Dong-Chan Park, Go-Woon Jung, Sae Kwang Ku, Jae-Suk Choi
The present study assessed the beneficial skeletal muscle‑preserving effects of extracellular polysaccharides from Aureobasidium pullulans SM‑2001 (Polycan) (EAP) on dexamethasone (DEXA)‑induced catabolic muscle atrophy in mice. To investigate whether EAP prevented catabolic DEXA‑induced muscle atrophy, and to examine its mechanisms of action, EAP (100, 200 and 400 mg/kg) was administered orally, once a day for 24 days. EAP treatment was initiated 2 weeks prior to DEXA treatment (1 mg/kg, once a day for 10 days) in mice...
November 10, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29138744/multiple-myeloma-in-an-amur-tiger-panthera-tigris-altaica
#19
Alison M Lee, Naomi Guppy, John Bainbridge, Hanne Jahns
The Amur tiger (Panthera tigris altaica) is an endangered tiger subspecies. An adult zoo-bred female was found collapsed, and died despite supportive treatment. Hematology and biochemistry showed pancytopenia and hyperglobulinemia, and serum protein electrophoresis revealed a monoclonal band in the β-globulin region. Necropsy demonstrated hemoabdomen, multifocal lytic bone marrow lesions, splenomegaly, and hemorrhagic hepatic nodules, with left medial lobe rupture. There were mutifocal hemorrhages in the subcutis, lung, epicardium, and intestinal mucosa...
2017: Open veterinary journal
https://www.readbyqxmd.com/read/29138381/-a-case-of-lung-cancer-associated-with-drug-induced-immune-thrombocytopenia
#20
Mayuka Yamane, Toshihito Otani, Yojiro Onari
A Stage IV lung adenocarcinoma was diagnosed in the left upper lobe of an 81-year-old man 2.5 years ago. Following another form of chemotherapy, he then received docetaxel as fourth-line therapy. After 21 days of therapy, although his white blood cell count recovered, his platelet count decreased to 20,000/mL and continued to decrease. Subsequently, he was closely monitored without therapy, and eventually, his platelet count returned within the normal range after 112 days. Blood biochemistry and bone marrow paracentesis findings suggested the presence of paraneoplastic syndrome, idiopathic thrombocytopenic purpura, and drug-induced immune thrombocytopenia...
November 2017: Gan to Kagaku Ryoho. Cancer & Chemotherapy
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