scholarly journals Using Selected Chemical and Physical Factors to Cross-link a BioCo Polymer Binder - Mineral Matrix System / Zastosowanie wybranych czynników chemicznych i fizycznych w procesie sieciowania układu spoiwo polimerowe BioCo – osnowa mineralna

2013 ◽  
Vol 13 (2) ◽  
pp. 29-34 ◽  
Author(s):  
B. Grabowska ◽  
A. Bobrowski ◽  
E. Olejnik ◽  
K. Kaczmarska
Keyword(s):  
Microwave Radiation ◽  
Setting Time ◽  
Basic Research ◽  
Sodium Acrylate ◽  
Cross Linking ◽  
Physical Factors ◽  
Matrix System ◽  
Strength Parameters ◽  
Chemical Factors ◽  
Physical And Chemical

Abstract This publication describes research on the course of the process of cross-linking new BioCo polymer binders - in the form of water-based polymer compositions of poly(acrylic acid) or poly(sodium acrylate)/modified polysaccharide - using selected physical and chemical factors. It has been shown that the type of cross-linking factor used influences the strength parameters of the moulding sand. The crosslinking factors selected during basic research make it possible to obtain sand strengths similar to those of samples of sands bonded with commercial binders. Microwave radiation turned out to be the most effective cross-linking factor in a binder-matrix system. It was proven that adsorption in the microwave radiation field leads to the formation of polymer lattices with hydrogen bonds which play a major role in maintaining the formed cross-linked structures in the binder-matrix system. As a result, the process improves the strength parameters of the sand, whereas the hardening process in a microwave field significantly shortens the setting time.

Further Studies upon Chemical Factors Affecting the Breeding of Anopheles in Trinidad

1934 ◽  
Vol 25 (4) ◽  
pp. 491-494 ◽  
Author(s):  
P. A. Buxton
Keyword(s):  
Analytical Study ◽  
Chemical Constituents ◽  
Physical Factors ◽  
Factors Affecting ◽  
Early Stages ◽  
Freshwater Biology ◽  
Chemical Technique ◽  
Chemical Factors ◽  
Physical And Chemical

During the last decade, entomologists have made progress in understanding the environment in which certain insects live; in particular, we begin to understand the effect of certain physical and chemical factors, which make up a part of the environment. With this gain in knowledge, it is sometimes possible to forecast outbreaks of insects and of diseases conveyed by them, and one can sometimes say that a particular alteration of the environment will result in loss or gain. But so far as mosquitos are concerned, one must admit that though much work has been devoted to the analytical study of the water in which the early stages are passed, the results are disappointing. A consideration of the published work suggests several reasons for this. Investigation into the ecology of the mosquito has had a vogue, and much of it has been done by workers who were isolated and whose knowledge of chemical technique and freshwater biology was limited. Apart from that, the inherent difficulties are great, for the worker must hunt for the limiting chemical and physical factors among a host of others which are doubtless unimportant, and there are few clues to indicate which of the chemical constituents of the water affects the mosquito. The data are therefore voluminous and it is difficult to reduce them to order and present them so that they can be readily understood.

scholarly journals Hygienic assessment of the complex of physical and chemical factors affecting a person in rooms of the different purpose in in-patients medical institutions

2021 ◽  
Vol 100 (6) ◽  
pp. 546-554
Author(s):  
Nikolay V. Rusakov ◽  
Natalia V. Kalinina ◽  
Elena B. Gaponova ◽  
Mikhail Ye. Goshin ◽  
Ilya M. Banin
Keyword(s):  
Primary Source ◽  
Hospital Environment ◽  
Physical Factors ◽  
Natural Light ◽  
Artificial Light ◽  
Radiation Level ◽  
Factors Affecting ◽  
Medical Institutions ◽  
Chemical Factors ◽  
Physical And Chemical

Introduction. The paper presents the hygienic assessment of the complex physical and chemical factors affecting patients and staff in the different premises of institutional medical organizations. Material and methods. The comprehensive hygienic assessment of the internal environment of medical institutions was based on three in-patient medical institutions (IMI). The research objects were medical wards, operating rooms, treatment rooms, dressing rooms, physiotherapy rooms, laboratory and diagnostic rooms, utility rooms. The study included measurements of the following parameters: microclimate, noise, electromagnetic fields level in different frequency ranges, ion regime, assessment of natural light, artificial light, insolation, gamma radiation level, measurements of concentrations of carbon dioxide, oxygen, ozone, radon, mercury vapor, and volatile organic compounds. Results. It is shown that in the hospital environment, a person is affected by complex physical factors. Microclimatic parameters are one of the most significant factors in the hospital environment that require constant monitoring. The control of the given factor is exceptionally substantial in IMI buildings that are not equipped with in-patients an air conditioning system. The highest noise levels were found in physiotherapy rooms and diagnostic rooms. The primary source of noise in medical rooms is working equipment, inwards - conversational speech. Both patients and medical workers were established to receive the main electromagnetic load in diagnostic rooms, laboratory rooms, and physiotherapy rooms. The assessment of the light environment showed that each of the examined rooms was provided with a sufficient level of natural light, and the duration of insolation in the treatment rooms corresponded to hygienic requirements. The highest levels of artificial light were in rooms with led lights. In the air of the examined rooms, light ions of both polarities were either absent, or their content was below the minimum required concentration. Higher concentrations of organic acids and chlorine-containing compounds were found in the surveyed premises of IMO compared to the air in other public buildings. The highest concentration of chemical compounds in the air was observed in wards and diagnostic rooms. Conclusion. The need for regular monitoring of physical and chemical factors affecting patients and staff in IMI is justified. A list of physical factors for carrying out risk-oriented control in hospital premises, taking into account their functional purpose, is required.

scholarly journals Factors Enhancing Virulence Response of Agrobacteria in Cucumber (Cucumis sativus L.)

2010 ◽  
pp. 72-81
Author(s):  
AKM Mohiuddin ◽  
Zaliha C Abdullah ◽  
MKU Chowdhury ◽  
K Harikrishna ◽  
Suhaimi Napis
Keyword(s):  
Light Intensity ◽  
Cucumis Sativus ◽  
Hairy Roots ◽  
Tissue Type ◽  
Physical Factors ◽  
Wild Type ◽  
Agrobacterium Strain ◽  
Cucumis Sativus L ◽  
Chemical Factors ◽  
Physical And Chemical

The virulence response of five wild type Agrobacterium tumefaciens (tumorigenic) strains and five wild type A. rhizogenes (oncogenic) strains was studied in cucumber (Cucumis sativus L.), cv. Spring Swallow. Several physical and chemical factors e.g. Agrobacterium strains, tissue type (stem and petiole tissues), light intensity, dark incubation, concentrations of acetosyringone (a phenolic compound) were tested. The virulent response of Agrobacteria was found to be depend on plant tissue type, Agrobacterium strain, tissue-Agrobacterium interaction and both chemical-physical factors. Specific light intensity, 2500-lux, as well as the acetosyringone concentration, 20-mM, played important role in virulence response. Among the different strains, LBA 4404 and 15834 were highly virulent to cucumber compared to the other strains tested. A. tumefaciens strains A348 and A281 were failed to initiate crown galls in both stem and petiole tissues, however, in the presence of acetosyringone they produced crown galls. Similarly, A. rhizogenes strain A4 initiated hairy roots in the presence of acetosyringone. All developed crown galls and hairy roots showed an autonomous growth on a hormone free medium containing cefatoxime. Thus, enhancement of virulence response was not only dependent on Agrobacterium strains, but also on particular physical and chemical factors also play vital role.

scholarly journals How to reprogram human fibroblasts to neurons

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ziran Xu ◽  
Shengnan Su ◽  
Siyan Zhou ◽  
Wentao Yang ◽  
Xin Deng ◽  
...  
Keyword(s):  
Neurodegenerative Diseases ◽  
Neurological Diseases ◽  
Human Fibroblasts ◽  
Physical Factors ◽  
Somatic Cell Reprogramming ◽  
New Ideas ◽  
Chemical Factors ◽  
Physical And Chemical

Abstract Destruction and death of neurons can lead to neurodegenerative diseases. One possible way to treat neurodegenerative diseases and damage of the nervous system is replacing damaged and dead neurons by cell transplantation. If new neurons can replace the lost neurons, patients may be able to regain the lost functions of memory, motor, and so on. Therefore, acquiring neurons conveniently and efficiently is vital to treat neurological diseases. In recent years, studies on reprogramming human fibroblasts into neurons have emerged one after another, and this paper summarizes all these studies. Scientists find small molecules and transcription factors playing a crucial role in reprogramming and inducing neuron production. At the same time, both the physiological microenvironment in vivo and the physical and chemical factors in vitro play an essential role in the induction of neurons. Therefore, this paper summarized and analyzed these relevant factors. In addition, due to the unique advantages of physical factors in the process of reprogramming human fibroblasts into neurons, such as safe and minimally invasive, it has a more promising application prospect. Therefore, this paper also summarizes some successful physical mechanisms of utilizing fibroblasts to acquire neurons, which will provide new ideas for somatic cell reprogramming.

scholarly journals INVENTARISASI MAKROINVERTEBRATA BENTIK DI SUNGAI MENTUKA KABUPATEN SEKADAU KALIMANTAN BARAT

2019 ◽  
Vol 8 (3) ◽  
Author(s):  
Paulus Sangau ◽  
Junardi Junardi ◽  
Diah Wulandari Rousdy
Keyword(s):  
Carbon Dioxide ◽  
Water Quality ◽  
Current Velocity ◽  
Diversity Index ◽  
Physical Factors ◽  
Polluted River ◽  
Free Carbon Dioxide ◽  
Chemical Factors ◽  
Carbon Dioxide Co2 ◽  
Physical And Chemical

The existence of Ephemeroptera, Plecoptera and Trichoptera (EPT) macroinvertebrates in water can be used as the indicators to identify the water quality. This study aims to determine the diversity of Macroinvertebrates and physical and chemical factors in water of the Mentuka River. Macroinvertebrate sampling was carried out in February 2018 using random with surber and dip net at three stations spread overthe upstream, middle and downstream of the Mentuka River. The measurements chemicals and physical factors such as water temperature, brightness, current velocity, depth, TDS, TSS, acidity (pH), dissolved oxygen (DO) and free carbon dioxide (CO2), which is carried out together with macroinvertebrates sampling. There are 378 macroinvertebrates individuals belonging to nine genera, namely Polypedilum, Hydropsyche, Anthopotamus, Baetis, Acroneuria, Libellula, Rhyacophila, Parathelphusa and Macrobrachium in Mentuka River. The Ephemeroptera, Baetis is the most abundance with 5.76 ind/m2. Based on the diversity index, the Mentuka was categorized as moderately polluted river.

scholarly journals INDOOR AIR QUALITY STUDY ON COASTAL BAILEO IN WEST SERAM, MALUKU

2021 ◽  
Vol 47 (1) ◽  
pp. 35-42
Author(s):  
Purnama Esa Dora Tedjokoesoemo ◽  
Felicia Jane Thendean
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Quantitative Research ◽  
Comfort Level ◽  
Physical Factors ◽  
Air Velocity ◽  
Chemical Factors ◽  
Physical And Chemical

Thermal comfort is one of the most influencing aspects to affect comfort level in interior. Indoor Air Quality (IAQ) is one part of thermal comfort parametric often suggested in any building assessment for its role to affect health and comfort. IAQ is influenced by physical factors (temperature, air humidity and air velocity) and chemical factors (in the form of substances in the air). Traditional buildings in Indonesia, has long since consider IAQ in its passive design approach, one of them is in Baileo. This paper reports an investigation of IAQ in coastal Baileo in West Seram, Maluku. This quantitative research is conducted in method comparative analysis method. This paper discusses the relation between IAQ in Baileo to building formation and materials selection. The measurement done show that IAQ in coastal Baileo in West Seram has good performance on both physical and chemical factors.

Study on Thickening after Preparation Phenomenon of Alcohol-Based Gravure Ink

2012 ◽  
Vol 262 ◽  
pp. 480-485
Author(s):  
Ying Jie Xu ◽  
Xian Fu Wei ◽  
Bei Qing Huang
Keyword(s):  
Functional Group ◽  
Physical Factor ◽  
System Stability ◽  
Physical Factors ◽  
Storage Process ◽  
Chemical Factors ◽  
Alcohol System ◽  
The Stability ◽  
Physical And Chemical ◽  
Viscosity Changes

The thickening after preparation phenomenon of ink refers to the viscosity of ink after preparation is constantly changing during its storage process. The appropriate increase of ink viscosity during its storage plays an important role in preventing the particles of pigment sedimentation. The utility of the ink is negatively affected by the rise of viscosity of ink that is over a certain range during the process of storage. The rise is a result of the broken of the system stability owing to some physical and chemical factors. In order to improve the stability of ink during its storage, not only the viscosity changes of ink prepared by pigment and resin with different kinds of functional group during storage are measured, but also the chemical factors contribute to the thickening after preparation phenomenon of ink are analyzed. What is more, the viscosity changes of ink prepared by different constituent content during storage are measured, and the physical factors lead to the thickening after preparation phenomenon of ink are analyzed as well. According to the research results, the functional groups of pigment and resin set off a chemical reaction in alcohol system, which is the main reason for the thickening after preparation phenomenon of ink. The constituent content of ink is the essential physical factor that influences the thickening after preparation phenomenon of ink.

scholarly journals Analisis Hubungan Kondisi Perairan dengan Terumbu Karang di Desa Pemuteran Buleleng Bali

2017 ◽  
Vol 3 (2) ◽  
pp. 142 ◽  
Author(s):  
Sabil Al Alif ◽  
I Wayan Gede Astawa Karang ◽  
Yulianto Suteja
Keyword(s):  
Water Quality ◽  
Coral Reef ◽  
Coral Reefs ◽  
Coral Cover ◽  
Principal Component ◽  
Quality Parameters ◽  
Physical Factors ◽  
Chemical Factors ◽  
Main Components ◽  
Physical And Chemical

Coral reefs in the village of Pemuteran used for tourism activities. In the process of growth, the coral reef is strongly influenced by the water conditions both physical and chemical factors. This study aims to determine the characteristics of the water based physical and chemical factors, determine the percentage of coral cover, determine the relationship and influence the quality of the waters with coral reefs. Research carried out at Pemuteran Village in Mey 2016. The method used is linear transects and transect quadrant, principal component analysis to determine the effect of water quality parameters and relationships with coral reef. The results of the characteristics of the waters on physical factors, namely temperature 30 – 31°C, depth 4– 75 m, brightness 13 m, turbidity 1,2 –5,4 NTU, current velocity 0,1 – 0,4 m/s, and the substrate of sand. Based on chemical factors, namely salinity 31,25 – 31,55 ‰, pH 6,9–7,5, DO 5,5 – 6,4 mg/l, BOD5 0,57 – 0,76 mg/l, TSS 248–504 mg/l, nitrate 0,021 - 0,908 mg/l, and phosphate 0,065-0,95 mg/l. Coral cover percentage point 1 at 50,67%, points 2 at 65%, points 3 at 35%,points 4 at 85,33% and points 5 at 16,67%. While the point 6 - 10 there are no coral reefs. The main components of water quality that affect to the coral reef are the turbidity and substrate. The results show that the correlation of temperature and nitrate correlated very weakly. pH, DO, BOD5 and phosphate correlated enough. Salinity, current, and TSS strongly correlated. Depth, brightness, turbidity and substrate strongly correlate.

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