NETWORK THERMODYNAMIC SIMULATION OF NONLINEAR, COUPLED, DYNAMIC PHYSIOLOGICAL SYSTEMS

Author(s):  
D.C. Mikulecky ◽  
S.R. Thomas
TAPPI Journal ◽  
2019 ◽  
Vol 18 (10) ◽  
pp. 595-602
Author(s):  
ALISHA GIGLIO ◽  
VLADIMIROS G. PAPANGELAKIS ◽  
HONGHI TRAN

The formation of hard calcite (CaCO3) scale in green liquor handling systems is a persistent problem in many kraft pulp mills. CaCO3 precipitates when its concentration in the green liquor exceeds its solubility. While the solubility of CaCO3 in water is well known, it is not so in the highly alkaline green liquor environment. A systematic study was conducted to determine the solubility of CaCO3 in green liquor as a function of temperature, total titratable alkali (TTA), causticity, and sulfidity. The results show that the solubility increases with increased temperature, increased TTA, decreased causticity, and decreased sulfidity. The new solubility data was incorporated into OLI (a thermodynamic simulation program for aqueous salt systems) to generate a series of CaCO3 solubility curves for various green liquor conditions. The results help explain how calcite scale forms in green liquor handling systems.


Author(s):  
R.P. Merchan ◽  
M.J. Santos ◽  
A. Medina ◽  
A. Calvo

Author(s):  
Hugo Farne ◽  
Edward Norris-Cervetto ◽  
James Warbrick-Smith

Oxford Cases in Medicine and Surgery, second edition, teaches students a logical step-by-step diagnostic approach to common patient presentations. This approach mirrors that used by successful clinicians on the wards, challenging students with questions at each stage of a case (history-taking, examination, investigation, management). In tackling these questions, students understand how to critically analyse information and learn to integrate their existing knowledge to a real-life scenario from start to finish. Each chapter focuses on a common presenting symptom (e.g. chest pain). By starting with a symptom, mirroring real life settings, students learn to draw on their knowledge of different physiological systems - for example, cardiology, respiratory, gastroenterology - at the same time. All the major presenting symptoms in general medicine and surgery are covered, together with a broad range of pathologies. This book is an essential resource for all medicine students, and provides a modern, well-rounded introduction to life on the wards. Ideal for those starting out in clinical medicine and an ideal refresher for those revising for OSCEs and finals.


2021 ◽  
Vol 10 (14) ◽  
pp. 3185
Author(s):  
Linsey J. F. Peters ◽  
Alexander Jans ◽  
Matthias Bartneck ◽  
Emiel P. C. van der Vorst

Atherosclerosis is the main underlying cause of cardiovascular diseases (CVDs), which remain the number one contributor to mortality worldwide. Although current therapies can slow down disease progression, no treatment is available that can fully cure or reverse atherosclerosis. Nanomedicine, which is the application of nanotechnology in medicine, is an emerging field in the treatment of many pathologies, including CVDs. It enables the production of drugs that interact with cellular receptors, and allows for controlling cellular processes after entering these cells. Nanomedicine aims to repair, control and monitor biological and physiological systems via nanoparticles (NPs), which have been shown to be efficient drug carriers. In this review we will, after a general introduction, highlight the advantages and limitations of the use of such nano-based medicine, the potential applications and targeting strategies via NPs. For example, we will provide a detailed discussion on NPs that can target relevant cellular receptors, such as integrins, or cellular processes related to atherogenesis, such as vascular smooth muscle cell proliferation. Furthermore, we will underline the (ongoing) clinical trials focusing on NPs in CVDs, which might bring new insights into this research field.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yanwen Wang ◽  
Cali Anderson ◽  
Halina Dobrzynski ◽  
George Hart ◽  
Alicia D’Souza ◽  
...  

AbstractPhysiological systems vary in a day-night manner anticipating increased demand at a particular time. Heart is no exception. Cardiac output is primarily determined by heart rate and unsurprisingly this varies in a day-night manner and is higher during the day in the human (anticipating increased day-time demand). Although this is attributed to a day-night rhythm in post-translational ion channel regulation in the heart’s pacemaker, the sinus node, by the autonomic nervous system, we investigated whether there is a day-night rhythm in transcription. RNAseq revealed that ~ 44% of the sinus node transcriptome (7134 of 16,387 transcripts) has a significant day-night rhythm. The data revealed the oscillating components of an intrinsic circadian clock. Presumably this clock (or perhaps the master circadian clock in the suprachiasmatic nucleus) is responsible for the rhythm observed in the transcriptional machinery, which in turn is responsible for the rhythm observed in the transcriptome. For example, there is a rhythm in transcripts responsible for the two principal pacemaker mechanisms (membrane and Ca2+ clocks), transcripts responsible for receptors and signalling pathways known to control pacemaking, transcripts from genes identified by GWAS as determinants of resting heart rate, and transcripts from genes responsible for familial and acquired sick sinus syndrome.


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