Particle removal by the respiratory system note on the removal of airborne particulates by the human respiratory tract with particular reference to the role of diffusion

1963 ◽  
Vol 25 (1) ◽  
pp. 29-39 ◽  
Author(s):  
H. D. Landahl
Keyword(s):  
Respiratory Tract ◽  
Respiratory System ◽  
Particle Removal ◽  
Human Respiratory Tract ◽  
Airborne Particulates

scholarly journals EXTRAORAL SWEET TASTE RECEPTORS IN RESPIRATORY SYSTEM

2018 ◽  
Vol 18 (1) ◽  
pp. 27-33 ◽  
Author(s):  
V N Mineev ◽  
P V Brukhanova ◽  
D E Koksharova
Keyword(s):  
Diabetes Mellitus ◽  
Respiratory Tract ◽  
Antimicrobial Peptides ◽  
Respiratory System ◽  
Clinical Medicine ◽  
Sweet Taste ◽  
Scientific Basis ◽  
Taste Receptors ◽  
Sweet Taste Receptors

The possible pathogenetic role of extraoral sweet taste receptors Tas1R in respiratory system is considered. In many respects, the function of extraoral receptors for sweet taste still remains unclear. The mechanism of intracellular signal transduction at sweet taste reception is considered, as well as the molecular mechanism of interaction of Tas2R and Tas1R receptors, expressed on the same cell. Tas1R receptors in respiratory system can function as a “rheostat” to control the amount of secretion of antimicrobial peptides that is mediated by extraoral bitter taste receptors Tas2R, depending on the concentration of glucose on the surface of the airways. In diabetes mellitus, the liquid on the luminal surface of respiratory tract contains an increased concentration of glucose, which leads to overexpression of TAS1R2 / TAS1R3, inhibition of Tas2R signaling activity and to decrease in secretion of antimicrobial peptides. Clinically, the effect on glucose homeostasis in the lumen of the respiratory tract with comorbid respiratory pathology, including diabetes mellitus, is considered. A possible sequence of pathogenetic mechanisms in respiratory system, associated with extraoral sweet taste receptors is presented as a vicious circle. Research into the problem of role of the ectopic chemosensory network in clinical medicine will bring new knowledge on the predisposition to diseases, a deeper understanding of the mechanisms of their development, and will serve as a scientific basis for developing new medicinal approaches.

scholarly journals Population Bottlenecks and Intra-host Evolution During Human-to-Human Transmission of SARS-CoV-2

2021 ◽  
Vol 8 ◽  
Author(s):  
Daxi Wang ◽  
Yanqun Wang ◽  
Wanying Sun ◽  
Lu Zhang ◽  
Jingkai Ji ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
Stochastic Dynamics ◽  
The Novel ◽  
Population Bottlenecks ◽  
Human Respiratory Tract ◽  
Human Coronavirus ◽  
Active Viral Replication ◽  
Host Evolution ◽  
Replication Activity

The emergence of the novel human coronavirus, SARS-CoV-2, causes a global COVID-19 (coronavirus disease 2019) pandemic. Here, we have characterized and compared viral populations of SARS-CoV-2 among COVID-19 patients within and across households. Our work showed an active viral replication activity in the human respiratory tract and the co-existence of genetically distinct viruses within the same host. The inter-host comparison among viral populations further revealed a narrow transmission bottleneck between patients from the same households, suggesting a dominated role of stochastic dynamics in both inter-host and intra-host evolutions.

scholarly journals NEUTROPHILS AND RESPIRATORY TRACT BACTERIAL INFECTIONS IN PATIENTS WITH BRONCHIAL ASTHMA AND COPD

2011 ◽  
Vol 8 (2) ◽  
pp. 34-43
Author(s):  
Gleb Borisovich Fedoseev ◽  
B I Trofimov ◽  
N N Rogacheva ◽  
T S Razumovskaya ◽  
G B Fedoseev ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
Allergic Asthma ◽  
Bronchial Asthma ◽  
Respiratory System ◽  
Functional Activity ◽  
Bacterial Infections ◽  
Clinical Investigations ◽  
Copd Patients ◽  
Asthma Patients

The article concerns the role of respiratory tract bacterial infections in development of bronchial asthma and COPD. Analysis is based on current publications and results of clinical investigations. Ability of neutrophils to protect the respiratory system from bacterial agents is underlined. The results obtained during investigation of 132 bronchial asthma and 33 COPD patients showed that in allergic asthma patients high percentage of sputum neutrophils is associated with normal FEV1% and mild course of the disease. In COPD patients high percentage of sputum neutrophils is usually associated with low FEV1%. It is proposed, that in these patients functional activity of neutrophils is associated with predominant injury of respiratory structures.

scholarly journals Evaluation of the Submicron Particles Distribution Between Mountain and Urban Site: Contribution of the Transportation for Defining Environmental and Human Health Issues

2019 ◽  
Vol 16 (8) ◽  
pp. 1339 ◽  
Author(s):  
Maurizio Manigrasso ◽  
Carmela Protano ◽  
Stefano Martellucci ◽  
Vincenzo Mattei ◽  
Matteo Vitali ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
Ultrafine Particle ◽  
Submicron Particles ◽  
Aerosol Size Distribution ◽  
Urban Site ◽  
Cumulative Number ◽  
Human Respiratory Tract ◽  
Mountain Site ◽  
The Difference

Transportation is one of the main causes of atmospheric pollution, especially in downtown big cities. Researchers usually point their attention to gaseous and/or particulate matter pollutants. This paper investigated the role of submicron particles, particularly the fraction ranging between 5–560 nm, in aerosol chemistry for identifying the contribution of autovehicular traffic and investigating the doses deposited in the human respiratory tract. Measurements carried out by two Fast Mobility Particle Sizer (FMPS, TSI) analyzers were simultaneously performed at two different sampling sites (an urban and a mountain site) during workdays and weekends in July. The total particle number (2–2.5 times higher in the urban site), the aerosol size distribution (different modes during the day), and the ultrafine/non-ultrafine particle ratios (ranging between 2–4 times between two sites) were investigated and discussed in relationship to the high autovehicular traffic in Rome and the almost null anthropogenic emissions at the mountain site, as well as the differing contributions of both to the “fresh nucleation” and to “aged aerosol”. Furthermore, the regional cumulative number doses deposited in the human respiratory tract were studied for both sites: The difference between the urban/mountain site was very high (up to 15 fold), confirming the pollutant role of transportation.

Role of Rasayana in Prevention of COVID-19 - A Review

2020 ◽  
Vol 11 (SPL1) ◽  
pp. 716-722
Author(s):  
Sneha Dhakite ◽  
Sadhana Misar Wajpeyi
Keyword(s):  
Immune System ◽  
Respiratory System ◽  
Viral Infections ◽  
Cost Effective ◽  
The Body ◽  
Healthy Life ◽  
Vital Functions ◽  
Healthy Life Style ◽  
And Control

The “Coronavirus disease 19 (COVID-19)” is caused by “Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)”, a newly discovered member of the Coronaviridae family of viruses which is a highly communicable. There is no effective medical treatment till date for Coronavirus disease hence prevention is the best way to keep disease away. Rasayana proved to be highly efficacious and cost effective for the Prevention and Control of viral infections when vaccines and standard therapies are lacking. Rasayana Chikitsa is one of the eight branches of Ashtanga Ayurveda which helps to maintain healthy life style. Rasayana improves immunity and performs many vital functions of human body. Vyadhikshamatva that is immune mechanism of the body is involved in Prevention of the occurrence of a new disease and it also decreases the virulence and progression of an existing disease. In COVID-19 the Respiratory system mainly get affected which is evident from its symptoms like cold, cough and breathlessness. Here the drugs help in enhancing immune system and strengthening functions of Respiratory system can be useful. For this purpose, the Rasayana like Chyavanprasha, Agastya Haritaki, Pippali Rasayana, Guduchi, Yashtimadhu, Haridra, Ashwagandha, Tulsi are used. Rasayana working on Respiratory system are best for Prevention of Coronavirus and boosting immune system. Rasayana Chikitsa can be effective in the Prevention as well as reducing symptoms of COVID-19.

Therapeutic role of vegetables in Respiratory Diseases – A critical review from Ayurvedic classics.

2016 ◽  
Vol 1 (3) ◽  
Author(s):  
Dr. Raghavendra Naik ◽  
Shweta Vekariya ◽  
R. N. Acharya ◽  
Sneha D. Borkar
Keyword(s):  
Clinical Practice ◽  
Respiratory Disease ◽  
Respiratory System ◽  
Critical Review ◽  
Critical Analysis ◽  
Respiratory Diseases ◽  
Unique Contribution ◽  
Pharmacological Activities ◽  
The Family

The concept of Pathya (wholesome diet) is an unique contribution of Ayurveda, which plays an important role in prevention and management of many diseases. “Shakavarga”, a category under dietetics in classical texts of Ayurveda enlisted different vegetables with their properties and indications in different disease conditions. These vegetables can be prescribed as Pathya (wholesome diet) in clinical practice. In the present review, plants described under Shakavarga, indicated as Pathya in different diseases related to Pranavaha Srotas (Respiratory system) were compiled from 15 different Ayurvedic classical texts. Critical analysis of the compiled data reveals that out of 332 vegetables described under Shakavarga, 44 are indicated in respiratory disease like Shvasa (Dyspnoea/Asthma), Kasa (Cough), Peenasa (Chronic rhinitis) and Hikka (Hiccup). Among them, botanical identity of 42 classical plants has been established and maximum number of vegetables belongs to the family cucurbitaceae (10) followed by solanaceae (4). Some of these vegetables have been reported for their various pharmacological activities related to prevention and management of diseases related to Pranavaha Srotas (Respiratory system). These vegetables are reported for their anti-inflammatory (16), antioxidant (14), anti-allergic (6) and antitussive (3) activities. The observed result may be helpful in use of vegetables as Pathya (wholesome diet) and planning further scientific studies about the efficacy of these plants on prevention as well as management of respiratory diseases.

A model for deposition of stable and unstable aerosols in the human respiratory tract

AIHAJ ◽  
1979 ◽  
Vol 40 (12) ◽  
pp. 1055-1066 ◽  
Author(s):  
E. AUSTIN ◽  
J. BROCK ◽  
E. WISSLER
Keyword(s):  
Respiratory Tract ◽  
Human Respiratory Tract

Numerical assessment of natural respiration and particles deposition in the computed tomography scan airway with a glomus tumour

2021 ◽  
pp. 095440892110240
Author(s):  
Digamber Singh
Keyword(s):  
Computed Tomography ◽  
Respiratory Tract ◽  
Particle Deposition ◽  
Flow Characteristics ◽  
Glomus Tumour ◽  
Computed Tomography Scan ◽  
Human Respiratory Tract ◽  
Airflow Pattern ◽  
Human Airways ◽  
Tomography Scan

The human respiratory tract has a complex airflow pattern. If any obstruction is present in the airways, it will change the airflow pattern and deposit particles inside the airways. This is the concern of breath quality (inspired air), and it is decreasing due to the unplanned production of material goods. This is a primary cause of respiratory illness (asthma, cancer, etc.). Therefore, it is important to identify the flow characteristics in the human airways and airways with a glomus tumour with particle deposition. A numerical diagnosis is presented with an asymmetric unsteady-state light breathing condition (10 l/min). An in vitro human respiratory tract model has been reconstructed using computed tomography scan techniques and an artificial glomus tumour developed 2 cm above a carina on the posterior wall of the trachea. The transient flow characteristics are numerically simulated with a realizable (low Reynolds number) k–ɛ turbulence model. The flow disturbance is captured around the tumour, which influenced the upstream and downstream of the flow. The flow velocity pattern, wall shear stress and probable area of inflammation (hotspot) due to suspended particle deposition are determined, which may assist doctors more effectively in aerosol therapy and prosthetics of human airways illness.

scholarly journals Letter to the Editor: Microbiota in the Respiratory System—A Possible Explanation to Age and Sex Variability in Susceptibility to SARS-CoV-2

2021 ◽  
Vol 14 ◽  
pp. 117863612098860
Author(s):  
Vishal Shah
Keyword(s):  
Respiratory System ◽  
Elderly Population ◽  
Age Groups ◽  
The Elderly ◽  
Elderly Adult ◽  
Human Respiratory Tract ◽  
System A ◽  
Number Of Patients ◽  
Children And Young Adults ◽  
Age And Sex

The Human respiratory tract is colonized by a variety of microbes and the microbiota change as we age. In this perspective, literature support is presented for the hypothesis that the respiratory system microbiota could explain the differential age and sex breakdown amongst COVID-19 patients. The number of patients in the older and elderly adult group is higher than the other age groups. The perspective presents the possibility that certain genera of bacteria present in the respiratory system microbiota in children and young adults could be directly or through eliciting an immune response from the host, prevent full-fledged infection of SARS-CoV-2. The possibility also exists that the microbiota in older adults and the elderly population have bacteria that make it easier for the virus to cause infection. I call upon the scientific community to investigate the link between human microbiota and SARS-CoV-2 susceptibility to further understand the viral pathogenesis.

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