Nanoparticles are defined as particles with size less than 100 nm and include natural, incidental... more Nanoparticles are defined as particles with size less than 100 nm and include natural, incidental and engineered nanoparticles. It is recognized that nanoparticles produce reactive oxygen species (ROS) inside and outside the cell and are the key factor in toxicological effects. Extremely low frequency electromagnetic fields (ELF EMF) occur primarily from 50 and 60 Hz electric power lines and from electric devices and installations in buildings. In medicine MRI scanners use strong magnetic fields, radio waves, and field gradients to form images of the body. Majority of research shows no genotoxic, or otherwise harmful, effects caused by any part of MRI . Gadodiamide is a gadolinium-based MRI contrast agent, used in MR imaging procedures to assist in the visualization of blood vessels. It is commonly marketed under the trade name Omniscan. Plant immature gametic cells were used as model cells in the research as very vulnerable to environmental influence. ROS production as a result of ...
Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.
In this study, we examined if vacuum drying can be an effective way to remove water from substant... more In this study, we examined if vacuum drying can be an effective way to remove water from substantia compacta, conducted in order to preserve bones for possible future transplantation. We found a number of interesting results. First, it seemed that vacuum drying removed the most of the water from substantia compacta. Second, we observed that vacuum drying did not damage the histological structure of the samples. These results indicate that vacuum drying might be used to remove water from compact bone, but more studies are required in order to assess how this method affects substantia compacta and also substantia spongiosa.
Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences., 2021
It is more common to perform non-invasive examination during general anaesthesia to ensure effect... more It is more common to perform non-invasive examination during general anaesthesia to ensure effective perioperative patient care. To achieve these results, researchers and clinicians are seeking out different technologies and developing new equipment. One such apparatus is a cerebral oximeter, which is used during cardiac surgery with cardiopulmonary bypass for neuroprotection management for reducing risk of postoperative neurological injury (cerebral stroke, neurocognitive dysfunction, and cerebral haemorrhage). A cerebral oximeter performs non-invasive transcutaneous measurements using near infrared radiation to assess the oxygenation of tissues. The objective of the study was to determine if the angle and thickness of a patient’s skull affects measurements. Intralipid water solution, gelatine, and ink were used to make six phantoms with skull thickness ranging from 6 to 11 mm. All phantoms were bent froma0to20 degrees angle. The cerebral oximeter SOMETICS INVOS 5100C was used to p...
Medical engineering is formed up to unify two dynamic professions — engineering and medicine. The... more Medical engineering is formed up to unify two dynamic professions — engineering and medicine. The responsibility of medical engineering specialists is related with implementation in practice of medical equipment and instruments. Medical physics is inwrought with radiation therapy, nuclear medicine, diagnostic radiology and radiation protection in medicine. Biomedical engineers and medical physicists could design and produce equipment and systems, using of which could control physiological function of organisms.
ABSTRACT Archaeology and anthropology are deeply interested in new technologies on reliable ident... more ABSTRACT Archaeology and anthropology are deeply interested in new technologies on reliable identification of belonging of excavated humans’ skeletons of middle centuries. The investigations are devoted to detect the irreversible structural changes in bones, what form up in time. Taking into account that bone as a material relaxes in time, the work is targeted to find physical methods for characterizing structurally depended relaxing physical properties of human bones from the XIII–XVIII centuries compared with the eligible specimens from the XX–XXI centuries. The research of physical properties for characterizing degradation processes in time is targeted at macro-, micro and nano- scales: 1) for estimating of bones at macro structural scale X-ray computer tomography is used, 2) for investigation of several century human bones at micro structural level and micro-hardness, micro indentation measurement techniques were applied. 3) for examination at nano- scale Fourier transform infrared spectroscopy (FTIR), and Photo thermo stimulated electron emission (PTSEE) analysis measurement techniques were applied. The radiographic density changes measured in Hounsfield units obtained from computer tomography, have not dependence from time (centuries). The HV and E of several centuries’ human bones obtained from micro hardness measurements have linear correlation with time (centuries). FT-IRS provides a maximum at line at 2350 cm−1 and minimum at 1726 cm−1 typical for the bones belonged to the XX century in contrast with specimens from other centuries. PTSEE has supplied a correlation of emission current derivation on the time (century).
To obtain circumferential measure from two photogrammetric images, one have to approximate cross-... more To obtain circumferential measure from two photogrammetric images, one have to approximate cross-section of the body part by some parametric curve. In the present paper, different ellipse – like approximations are considered with the aim to minimize difference between results of the direct and photogrammetric measurements. Keywords: anthropometrics measurements, photogrammetry
Nanoparticles are defined as particles with size less than 100 nm and include natural, incidental... more Nanoparticles are defined as particles with size less than 100 nm and include natural, incidental and engineered nanoparticles. It is recognized that nanoparticles produce reactive oxygen species (ROS) inside and outside the cell and are the key factor in toxicological effects. Extremely low frequency electromagnetic fields (ELF EMF) occur primarily from 50 and 60 Hz electric power lines and from electric devices and installations in buildings. In medicine MRI scanners use strong magnetic fields, radio waves, and field gradients to form images of the body. Majority of research shows no genotoxic, or otherwise harmful, effects caused by any part of MRI . Gadodiamide is a gadolinium-based MRI contrast agent, used in MR imaging procedures to assist in the visualization of blood vessels. It is commonly marketed under the trade name Omniscan. Plant immature gametic cells were used as model cells in the research as very vulnerable to environmental influence. ROS production as a result of ...
Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.
In this study, we examined if vacuum drying can be an effective way to remove water from substant... more In this study, we examined if vacuum drying can be an effective way to remove water from substantia compacta, conducted in order to preserve bones for possible future transplantation. We found a number of interesting results. First, it seemed that vacuum drying removed the most of the water from substantia compacta. Second, we observed that vacuum drying did not damage the histological structure of the samples. These results indicate that vacuum drying might be used to remove water from compact bone, but more studies are required in order to assess how this method affects substantia compacta and also substantia spongiosa.
Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences., 2021
It is more common to perform non-invasive examination during general anaesthesia to ensure effect... more It is more common to perform non-invasive examination during general anaesthesia to ensure effective perioperative patient care. To achieve these results, researchers and clinicians are seeking out different technologies and developing new equipment. One such apparatus is a cerebral oximeter, which is used during cardiac surgery with cardiopulmonary bypass for neuroprotection management for reducing risk of postoperative neurological injury (cerebral stroke, neurocognitive dysfunction, and cerebral haemorrhage). A cerebral oximeter performs non-invasive transcutaneous measurements using near infrared radiation to assess the oxygenation of tissues. The objective of the study was to determine if the angle and thickness of a patient’s skull affects measurements. Intralipid water solution, gelatine, and ink were used to make six phantoms with skull thickness ranging from 6 to 11 mm. All phantoms were bent froma0to20 degrees angle. The cerebral oximeter SOMETICS INVOS 5100C was used to p...
Medical engineering is formed up to unify two dynamic professions — engineering and medicine. The... more Medical engineering is formed up to unify two dynamic professions — engineering and medicine. The responsibility of medical engineering specialists is related with implementation in practice of medical equipment and instruments. Medical physics is inwrought with radiation therapy, nuclear medicine, diagnostic radiology and radiation protection in medicine. Biomedical engineers and medical physicists could design and produce equipment and systems, using of which could control physiological function of organisms.
ABSTRACT Archaeology and anthropology are deeply interested in new technologies on reliable ident... more ABSTRACT Archaeology and anthropology are deeply interested in new technologies on reliable identification of belonging of excavated humans’ skeletons of middle centuries. The investigations are devoted to detect the irreversible structural changes in bones, what form up in time. Taking into account that bone as a material relaxes in time, the work is targeted to find physical methods for characterizing structurally depended relaxing physical properties of human bones from the XIII–XVIII centuries compared with the eligible specimens from the XX–XXI centuries. The research of physical properties for characterizing degradation processes in time is targeted at macro-, micro and nano- scales: 1) for estimating of bones at macro structural scale X-ray computer tomography is used, 2) for investigation of several century human bones at micro structural level and micro-hardness, micro indentation measurement techniques were applied. 3) for examination at nano- scale Fourier transform infrared spectroscopy (FTIR), and Photo thermo stimulated electron emission (PTSEE) analysis measurement techniques were applied. The radiographic density changes measured in Hounsfield units obtained from computer tomography, have not dependence from time (centuries). The HV and E of several centuries’ human bones obtained from micro hardness measurements have linear correlation with time (centuries). FT-IRS provides a maximum at line at 2350 cm−1 and minimum at 1726 cm−1 typical for the bones belonged to the XX century in contrast with specimens from other centuries. PTSEE has supplied a correlation of emission current derivation on the time (century).
To obtain circumferential measure from two photogrammetric images, one have to approximate cross-... more To obtain circumferential measure from two photogrammetric images, one have to approximate cross-section of the body part by some parametric curve. In the present paper, different ellipse – like approximations are considered with the aim to minimize difference between results of the direct and photogrammetric measurements. Keywords: anthropometrics measurements, photogrammetry
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