scholarly journals Results of Scanning Electron Microscopy of Explanted Hydrophilic Acrylic IOLs

2021 ◽  
Vol 18 (2) ◽  
pp. 276-283
Author(s):  
A. A. Gamidov ◽  
I. A. Novikov ◽  
A. A. Tsymbal ◽  
R. A. Gamidov
Keyword(s):  
Central Zone ◽  
Optical Element ◽  
Anterior Wall ◽  
Pathological Process ◽  
Zonal Structure ◽  
Entire Surface ◽  
Hydrophobic Coating ◽  
Initial Stage ◽  
The Usa ◽  
Scanning Electron

Purpose: study the microscopic examination and microtopography of explanted hydrophilic acrylic IOLs with opacification.Material and methods. 5 samples of soft hydrophilic acrylic IOLs produced in European countries and the USA were studied. Explanted IOLs were studied using a scanning electron microscope (EVO LS10, Karl Zeiss, Germany-UK).Results. In 4 cases changes in hydrophilic acrylic IOL had the character of surface opacification in the area of the anterior wall of the optical element of the lens with localization in the Central zone (pupil area). In one case, the opacities were located over the entire surface of a hydrophilic IOL having a hydrophobic coating. The changes were characterized by the formation of crystalline deposits on the IOL surface at different stages of evolution. In the initial stage, primary point precipitates with sizes of 3–5 microns were formed. At a later stage, the changes had the form of “adult” spherocrystals with a typical radial-concentric zonal structure, up to 50 microns in size. In one of the of IOLs, the growth of crystals under the surface of the lens — in the thickness of IOLs was determined.Conclusion. The changes characterize different stages of the same type of pathological process with sedimentation of crystal deposits on the surface of IOL with changing crystallomorphology. 

scholarly journals Еvaluation data somatosensory evoked potentials and electromyography in patients with multiple sclerosis in the aspect comorbidity

2017 ◽  
pp. 22-29
Author(s):  
G. Chupryna ◽  
N. Svyrydova ◽  
T. Parnikoza
Keyword(s):  
Multiple Sclerosis ◽  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Clinical Signs ◽  
Pain Syndrome ◽  
Pathological Process ◽  
Psychological Status ◽  
Sensorimotor Polyneuropathy ◽  
Initial Stage ◽  
Prevalence Of Pain

The paper shows the results of electrophysiological methods of investigation in patients with multiple sclerosis (MS) in the aspect of comorbidity. The studies of somatosensory evoked potentials (SSEP) in 216 patients with MS and electroneuromyography in 158 patients with MS, together with the assessment of neurological and psychological status. It is shown that according SSEP increase latency peripheral response in a progressive course of MS compared to remitting associated with older age of patients with progressive MS, and due to involvement in the pathological process of the peripheral nervous system (PNS) and the prevalence of pain syndrome (PS) in patients MS with comorbidity. It is demonstrated, on the basis of electroneuromyographic that MS patients with comorbidity tends to be deeper shock PNS. The data electroneuromyographic clinically appropriate initial stage of sensory or sensorimotor polyneuropathy, which proceeded in 84.8% of patients with MS subclinical and 15.2% had a clear clinical signs.

scholarly journals Ultra-fine features of aerohaematic barrier in pneumoconiosis

2008 ◽  
pp. 77-79
Author(s):  
G. G. Kruglikov ◽  
B. T. Velichkovsky
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Blood Flow ◽  
Early Response ◽  
Dust Exposure ◽  
Pulmonary Capillaries ◽  
Initial Stage ◽  
Scanning Electron

Combined implication of optical, transmissive and scanning electron microscopy allowed detection of early response to dust exposure: slowing of blood flow and dilation of pulmonary capillaries, oedema and initial stage of fibrillogenesis in aerohaematic barrier.

Study on restraining frost growth at initial stage by hydrophobic coating and hygroscopic coating

2011 ◽  
Vol 43 (5) ◽  
pp. 1159-1163 ◽  
Author(s):  
Liang Cai ◽  
Ronghan Wang ◽  
Puxiu Hou ◽  
Xiaosong Zhang
Keyword(s):  
Hydrophobic Coating ◽  
Initial Stage ◽  
Frost Growth

Fabrication of Ni Sulfides by Thermal Sulfidation

2006 ◽  
Vol 510-511 ◽  
pp. 318-321
Author(s):  
Tae Hyun Nam ◽  
Cheol Am Yu ◽  
Dae Won Jung ◽  
Kwon Koo Cho
Keyword(s):  
Annealing Time ◽  
Annealing Temperature ◽  
Early Stage ◽  
Spherical Particles ◽  
Sulfur Pressure ◽  
X Ray ◽  
Ni Substrate ◽  
Initial Stage ◽  
Fabrication Parameters ◽  
Scanning Electron

The microstructure of Ni sulfides prepared by thermal sulfidation of pure Ni and their dependence of fabrication parameters were investigated by means of scanning electron microscopy and X-ray diffractions. Sulfidation was made by isothermally annealing Ni with the sulfur in vacuum sealed glass ampoules at 673 K for 120 – 600s under the sulfur pressure of 100 and 220 kPa. The sulfide layers formed in the early stage were found to consist of spherical particles smaller than 0.5um, which were grown and agglomerated with increasing annealing temperature. Thickness of sulfides developed on Ni substrate was found to increase with increasing annealing time and sulfur pressure. It was also found that compositions of dominant Ni sulfides changed with varying annealing time. At the initial stage, only Ni3S2 sulfide was formed on pure Ni, which was tightly bonded to Ni substrate. On increasing annealing time, NiS sulfide was formed. On further increasing annealing time, NiS1.97 sulfide was formed, which always coexisted with NiS sulfide. A mechanism for sulfidation of Ni is proposed as follows: 3Ni + 2S Ni3S2, Ni3S2 +S NiS, NiS + S NiS1.97

Study on Ball Milling of TiH2 and Application in Energetic Materials

2014 ◽  
Vol 599-601 ◽  
pp. 107-110
Author(s):  
Bing Xue ◽  
Hong Hao Ma ◽  
Zhao Wu Shen ◽  
Yong Yu ◽  
Li Jie Ren
Keyword(s):  
Particle Size ◽  
Energetic Materials ◽  
Ball Mill ◽  
Particle Distribution ◽  
High Explosives ◽  
Initial Stage ◽  
Time Scanning ◽  
Detonation Speed ◽  
Mill Process ◽  
Scanning Electron

Particle distribution of titanium hydride (TiH2) during the ball mill process was studied by milling it with different time. Scanning electron microscope (SEM) pictures showed that particle size decreased quickly at the initial stage, and homogeneous, super fine TiH2 powder was obtained after 4 h mill. Application of TiH2 in energetic materials was investigated by preparation of TiH2/RDX composite explosive and measuring the detonation speed. Results showed that detonation speed of TiH2/RDX explosive was depended on the content and particle size of TiH2. TiH2 is a potential additive in high explosives (HE).

Staged Repair of Extensive Tracheal and Laryngotracheal Stenoses

1986 ◽  
Vol 95 (6) ◽  
pp. 586-589 ◽  
Author(s):  
Hugh F. Biller ◽  
William Lawson ◽  
Verne Weisberg
Keyword(s):  
Skin Grafting ◽  
Anterior Wall ◽  
Operative Procedures ◽  
Great Length ◽  
Initial Stage ◽  
High Incidence ◽  
Analysis Of Failures ◽  
Time Required ◽  
Staged Reconstruction

The usual operative procedures (primary tracheal anastomosis, cricotracheal anastomosis, skin grafting and stenting, pedicle cartilage grafts, or free rib grafts) used to correct stenoses of great length involving the trachea or laryngotrachea have a high incidence of failure. An alternative method of reconstruction is the open technique, which requires three stages. The initial stage creates a trough after resection of the stenotic area, followed by subcutaneous embedding of a rigid material adjacent to the trough, and finally closure of the trough by reformation of the anterior wall. This staged procedure has been used in adult patients with tracheal stenoses greater than 4 cm, in patients with tracheal stenoses involving the cricoid, and in patients whose primary corrective operative procedures have failed. This paper critically assesses 30 patients who have had a staged reconstruction with a minimum follow-up of 12 months. The indications, number of procedures performed, time required for decannulation, complications, and analysis of failures are presented. The incidence of success in this series of patients is 76% (23/30).

scholarly journals Membran Reaktor untuk Pembuatan dan Pemurnian Isomer Xylene

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Wahyudin Wahyudin ◽  
Hens Saputra
Keyword(s):  
Pore Size Distribution ◽  
Zeolite Membrane ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Alumina Catalyst ◽  
Mfi Zeolite ◽  
Entire Surface ◽  
X Ray ◽  
Silica Alumina ◽  
Scanning Electron

Abstrak Membran reaktor merupakan konsep perpaduan dari sistem reaksi dan proses pemisahan/pemurnian. Membran ini disebut juga sebagai membran katalis atau sistem katalis-membran. Dengan membran reaktor ini diharapkan konversi suatu reaksi dapat ditingkatkan dan diperoleh suatu produk yang memiliki tingkat kemurnian lebih tinggi. Sebagai katalis digunakan silica alumina yang berukuran 1,0 mm. Membran anorganik  zeolit MFI dilapiskan menutupi seluruh permukaan katalis. Bahan baku yang digunakan antara lain tetraethylortosilicate (TEOS) sebagai sumber silikat dan template organik tetraprophyl ammonium bromide (TPABr). Proses kristalisasi dilakukan pada temperatur 453 K di dalam autogeneous autoclave, dilanjutkan dengan kalsinasi pada temperatur 873 K selama 1 jam. Karakterisasi membran zeolit yang dihasilkan dilakukan dengan X-ray diffraction (XRD) dan pengamatan dengan Scanning Electron Mycroscope (SEM). Karakteristik pori dipelajari menggunakan metode physisorption dan BJH pore size distribution. Selain itu dilakukan pula uji selektifitas dan alkilasi toluena dan xylene. Berdasarkan pengamatan menggunakan XRD mengindikasikan adanya struktur zeolit MFI pada sampel membrane katalis yang dihasilkan. Diperkuat dengan obserbasi SEM menunjukkan bahwa membran zeolit MFI melapisi seluruh permukaan pelet silika alumina dan terdapat indikasi terjadinya komposit terhadap silika alumina pada daerah perbatasan antara membran zeolit atau lapisan bagian luar dengan katalis silika alumina. Hasil pengujian menunjukkan hasil bahwa membran reaktor zeolit MFI berpotensi untuk diaplikasikan sebagai membran katalis yang bersifat sangat selektif terhadap bentuk suatu molekul. Kata kunci: membran reaktor, isomer, xylene, zeolit, silika alumina, hidrotermal   Abstract Membrane fusion reactor is the concept of system reactions and separation processes of purification. These membranes are called also catalyst membrane or catalyst-membrane system. With the reactor membrane is expected conversion of a reaction can be increased and obtained a product having a higher purity. As the silica alumina catalyst used measuring 1.0 mm. MFI zeolite coated inorganic membranes covering the entire surface of the catalyst. The raw materials used include tetraethylortosilicate (TEOS) as the source of silicates and organic template tetrapropyl ammonium bromide (TPABr). Crystallization process carried out at a temperature of 453 K in the autogeneous autoclave, followed by calcination at a temperature of 873 K for 1 hour. Characterization of zeolite membranes produced performed by X-ray diffraction (XRD) and scanning electron observations with Mycroscope (SEM). Pore ​​characteristics were studied using physisorption method and BJH pore size distribution. In addition, the selectivity of the test is also conducted and alkylation of toluene and xylene. Based on observations using XRD indicates a structure of MFI zeolite membrane on the resulting catalyst samples. Reinforced with SEM showed that the MFI zeolite membrane coating the entire surface of the silica alumina pellets and there are indications of the silica alumina composites in the border area between zeolite membrane or outer coating with silica alumina catalyst. The results show that the results of MFI zeolite reactor  membrane has the potential to be applied as a catalyst membrane that is highly selective to form a molecule. Keywords : reactor membrane, isomers, xylene, zeolite, silica alumina, hydrothermal

scholarly journals Embryonic development of Anodontites trapesialis (Lamarck, 1819) (Bivalvia: Mycetopodidae)

2011 ◽  
Vol 71 (1) ◽  
pp. 139-144 ◽  
Author(s):  
AT. Silva-Souza ◽  
P. Guardia-Felipi ◽  
NR. Arrebola
Keyword(s):  
Electron Microscopy ◽  
Embryonic Development ◽  
Phase Iii ◽  
Fish Farms ◽  
Egg Envelope ◽  
Initial Stage ◽  
Phases Of Development ◽  
Five Phases ◽  
First Time ◽  
Scanning Electron

The phases of embryonic development of Anodontites trapesialis lasidia are described for the first time. Adult specimens were obtained from two fish farms located in Londrina, Paraná, Brazil. The internal demibranchs of 120 individuals were studied using a routine histological technique; 70 of these carried eggs and/or larvae in the marsupium and were utilized for the description of the phases of embryonic development. The demibranchs of five specimens were evaluated by scanning electron microscopy to detail the morphology of the larvae. Five phases of development were established: phase I, corresponding to the initial stage of cleavage with the formation of apical cells; phase II, including the stages of the morula and blastula; phase III, where the gastrula forms; phase IV, where the larva formed is still inside the egg envelope; and phase V, where the lasidium can still be identified immediately after eclosion.

scholarly journals PERSONALIZED MEDICINE: CURRENT SITUATION AND PERSPECTIVES

2015 ◽  
Vol 2 (88) ◽  
pp. 6-11
Author(s):  
M. V. Khajtovych
Keyword(s):  
Personalized Medicine ◽  
New Technologies ◽  
Modern Medicine ◽  
Selective Exposure ◽  
Pathological Process ◽  
Long Run ◽  
Initial Stage ◽  
Choice Of Treatment ◽  
The Individual ◽  
Life Predictions

Summary. Personalized medicine it is a model of health care based on a selection of diagnostic, therapeutic and preventive means taking into account the genetic, physiological, biochemical and other features of the patient. Personalized medicine new branch of modern medicine, in which developed and applied treatments, “tailored” specifically for the individual patient. Areas of application of personalized medicine in modern terms: the transition from traditional to personalized clinical diagnosis of the disease based on individual patient parameters, including using different molecular biomarkers nature, and save biomaterial throughout his life; predictions based on genomic data likelihood of a disease with the development of individual preventive scheme; identification of potential pharmacotherapeutic targets for selective exposure at the initial stage of the pathological process; choice of treatment strategy tailored to the individual patient parameters; monitoring of treatment using biomarkers. Strengthening the role of clinical pharmacology and create genetically informed personalized medicine algorithms increase the efficiency and safety of pharmacotherapy. New technologies make it possible to clarify the causes adverse side effects at the genetic level, prevent, reduce treatment costs and significantly enhance its security and therefore implementation of these approaches in the long run will contribute to significant savings.

scholarly journals Modeling the USA Winter 2021 Resurgence

2022 ◽  
Author(s):  
Genghmun Eng
Keyword(s):  
Doubling Time ◽  
Social Distancing ◽  
Initial Stage ◽  
The Usa ◽  
Parameter Values ◽  
O 11 ◽  
Pandemic Wave

The current USA 2021 CoVID-19 Winter Resurgence is modeled here with the same function used for analyzing prior USA CoVID-19 waves: N(t)= max[N/o\exp{+(t/[t/R\(1+α/s\t)]exp(-δ/o\t)}]. Here, N(t) gives the total number of CoVID-19 cases above the previous baseline, and t/R\ sets the initial t/dbl\ = [t/R\ ln(2)] pandemic t/dbl\ doubling time. Larger α/s\ values indicate that uninfected people are improving their pandemic mitigation efforts, such as Social Distancing and vaccinations; while δ/o\>0 accelerates the post-peak [(d/dt)N(t)] tail-off, and is empirically associated with mask-wearing. The pandemic wave end is when N(t) no longer increases. Results from the USA Summer 2021 Resurgence (see prior medrxiv.org preprints*) were used as a baseline. By 11/15/2021, an additional N/o\(11/15/2021)=107,000 cases above baseline were found, signaling the USA Winter 2021 Resurgence. This CoVID-19 wave is still in its initial stages. Presently, our analysis indicates that this CoVID-19 wave can infect virtually all susceptible persons; just like the initial stage of the USA Summer 2021 Resurgence. Data up through 12/30/2021 gives these parameter values: t/R\=8.05 days; α/s\=0.011/day. These values are identical to the prior 2020 USA Winter Resurgence results. Also, the present N/o\(11/15/2021) and the prior N/o\(9/25/2020)=89,900 values are similar. However, while the Winter 2020 Resurgence showed a significant mask-wearing effect: δ/o\(2020)= 1.748 x 10^-3 / day, this initial USA Winter 2021 Resurgence shows practically no mask-wearing effects: δ/o\(2021)< 0.001 x 10^-3 / day. If mask-wearing were to quickly rise to the Winter 2020 levels, it would give these projected totals: N(t=[1/1/2022])= 54,705,400; N(t=[3/21/2022])= 83,371,000; N(t=[3/21/2024])= 92,399,000. More robust mask-wearing and enhanced Social Distancing measures could further reduce these values (with 3 Figures). * (10.1101_2021.08.16.21262150; 10.1101_2021.10.15.21265078)

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