Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 5.160
Filtrar
1.
Stomatologiia (Mosk) ; 99(5): 69-73, 2020.
Artigo em Russo | MEDLINE | ID: mdl-33034180

RESUMO

The purpose of the study was to evaluate the efficacy of vacuum-gradient therapy in reducing orthodontic treatment time. MATERIALS AND METHODS: The study comprised 57 patients aged from 25 to 35 years (mean age 28.8±4.6 years) with teeth crowding divided into two groups. In group 1 (n=29) orthodontic correction was combined with vacuum-gradient therapy by means of modified «AVLT-Desna¼ device, while patients in group 2 (n=28) underwent orthodontic correction alone. Microhaemo- and lymphocirculation was studied by laser Doppler flowmetry. RESULTS: Lymph draining and microhaemocirculation are impaired by teeth crowding. Orthodontic correction influences on microhaemo- and lymphocirculation of periodontal tissue on tooth movement and improves mechanisms of haemodynamic regulation. CONCLUSIONS: The method of vacuum-gradient therapy combined with complex malocclusion correction allows to accelerate orthodontic treatment and to improve microcirculation in the moved teeth area.


Assuntos
Má Oclusão , Dente , Adulto , Assistência Odontológica , Humanos , Técnicas de Movimentação Dentária , Vácuo , Adulto Jovem
2.
Wei Sheng Yan Jiu ; 49(4): 603-612, 2020 Jul.
Artigo em Chinês | MEDLINE | ID: mdl-32928352

RESUMO

OBJECTIVE: A method based on isotope internal standard dilution was established for the determination of four polycyclic aromatic hydrocarbons(PAH4) including chrysene, benzo [a] anthracene, benzo [b] fluoranthene and benzo [a] pyrene in spicy strips sold in the markets. METHODS: The hot strips were homogenized and the target compounds were extracted with n-hexane, concentrated in vacuum, saponified and purified by solid phase extraction column, then the pretreated samples were separated by DB-EUPAH column(20 m×0. 18 mm, 0. 14 µm), detected by gas chromatography-mass spectrometry(GC-MS)and quantified by internal standard of isotope. RESULTS: The recoveries of PAH4 in different concentration levels of hot noodles were 91. 0%-103. 5%, and the relative standard deviation(RSD)was 1. 89%-6. 73%(n=6). The detection limit was 0. 30 µg/kg and the quantitative limit was 1. 0 µg/kg. The content of PAH4(sum) in 27 collected samples ranged from 1. 35 µg/kg to 11. 44 µg/kg, and the detection rate was 100%. CONCLUSION: With less solvent consumption, good purification effect and blank control, the method is simple, rapid and accurate and meets the detecting requirements of PAH4 in hot strips.


Assuntos
Hidrocarbonetos Policíclicos Aromáticos/análise , Cromatografia Gasosa-Espectrometria de Massas , Isótopos , Espectrometria de Massas , Vácuo
3.
Hu Li Za Zhi ; 67(4): 33-38, 2020 Aug.
Artigo em Chinês | MEDLINE | ID: mdl-32748377

RESUMO

Oropharyngeal dysphagia, a swallowing disorder, is a common problem faced by older adults living in residential care. A direct management strategy for this disorder is to modify the texture of foods prior to serving using techniques such as chopping, mashing, liquid thickening, and reshaping. However, the process of texture modification causes foods to lose a significant amount of their nutritional value and reduces the motivation and fun of eating for diners. Eating is part of the enjoyment of life, and managing the nutrition status of older adults living in residential care is an important issue in aged societies. In this article, issues related to modified-texture foods, including their generally lower nutritional value, are discussed. In addition, combinations of cooking techniques that may increase tenderness in meat are explored to promote the future development of the soft-food meals for older adults living in residential care. One of the described techniques uses fresh fruits to pickle meat and vacuum low-temperature cooking technology that preserves the shape of meat after cooking and makes meat sufficiently soft to be broken up by the tongue. Vacuum low-temperature cooking allows for the precise control of cooking time and temperature, and professional cooking techniques may be used to improve the quality of the texture-softened foods. It is the hope of the authors that this article is used a reference for the future development of texture-softened foods for older adults living in residential care.


Assuntos
Culinária/métodos , Transtornos de Deglutição/dietoterapia , Alimentos , Instituições Residenciais , Idoso , Difusão de Inovações , Humanos , Carne , Vácuo
4.
PLoS One ; 15(8): e0237841, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32813733

RESUMO

To function effectively, a lower limb prosthetic socket must remain securely coupled to the residual limb during walking, running and other activities of daily living; this coupling is referred to as suspension. When this coupling is insufficient longitudinal pistoning of the socket relative to the residual limb occurs. Increasing friction of the socket/liner interface may improve socket suspension and textured sockets may be fabricated relatively easily with 3D printing. The aim of this study was to investigate longitudinal displacement of sockets with different types of textures under two suspension conditions: passive suction and active vacuum. In order to do this, we developed a mock residual limb and mechanical testing protocol. Prosthetic sockets, 14 textured sockets and an Original Squirt-Shape (OSS) Socket, were fabricated from polypropylene copolymer using the Squirt-Shape™ 3D Printer and compared to a smooth socket thermoformed from polypropylene copolymer. Sockets were mounted onto a dual durometer mock residual limb and subjected to four levels of distraction forces (100 N, 250 N, 500 N and 650 N) using a hydraulic material testing system. There was a statistically significant three-way interaction between suspension, force level and texture (p < 0.0005). Longitudinal displacements between textured and reference sockets, for all force levels and both suspension conditions, were significantly different (p < 0.0005). Using these newly developed mechanical testing protocols, it was demonstrated that texturing of polypropylene copolymer sockets fabricated using Squirt-Shape significantly decreased longitudinal displacements compared to a smooth socket. However, none of the novel textured sockets significantly reduced longitudinal displacement compared to the OSS socket under passive suction suspension.


Assuntos
Extremidade Inferior/fisiologia , Teste de Materiais , Fenômenos Mecânicos , Desenho de Prótese , Processamento de Imagem Assistida por Computador , Sucção , Vácuo
5.
Zhonghua Shao Shang Za Zhi ; 36(8): 671-678, 2020 Aug 20.
Artigo em Chinês | MEDLINE | ID: mdl-32829606

RESUMO

Objective: To develop a wireless sensor module for wound temperature and pressure (hereinafter referred to as wireless sensor module), and to carry out related characteristic test and biosafety evaluation. Methods: (1) The structure and working mode of the wireless sensor module were designed. The temperature and humidity sensor welded at one end of the flexible cable and the pressure sensor were simultaneously connected with the printed circuit board, which was welded with the Bluetooth transmitter, microprocessor, and power interface to establish a wireless sensor module. A mobile data receiving application was developed and the monitoring values of the wireless sensor module exposed to the air were read through the Bluetooth function on the smart phone. (2) The temperature of a 35-42 ℃ hot water bag was measured by the wireless sensor module and an infrared thermometer at the same time, and 30 pairs of data were compared with correlation analysis performed. (3) The vacuum sealing drainage material was pasted on the arm of the second author, and the wireless sensor module was placed in the condition of negative pressure. The negative pressure values measured by the wireless sensor module and the negative pressure meter values were recorded at the same time, and 14 pairs of data were compared with correlation analysis performed. (4) The corresponding material extract was prepared by adding 1 mL normal saline per 3 square centimeters surface area of the pressure sensor or flexible cable with temperature and humidity sensor welded respectively. Twenty 6-8 week-old female C57BL/6 mice were weighed before experiment and divided into pressure sensor extract group, flexible cable extract group, mixed extract group, and normal saline group according to the random number table (n=5). The abnormal toxic reactions of mice were observed after intraperitoneal injection of pressure sensor extract, flexible cable with temperature and humidity sensor welded extract, 1∶1 mixed extract of pressure sensor extract and flexible cable with temperature and humidity sensor welded extract, and normal saline for 50 mL/kg in corresponding groups. The body mass of mice was weighed at 24, 48, and 72 hours after injection, and the toxicity of the materials was evaluated comprehensively. (5) Four Japanese big ear white rabbits aged 3-6 months were selected, and there was no limit between male and female. Two regions on the left side of the spine were applied with aseptic gauze as aseptic gauze group, and two areas on the right side of the spine were applied with wireless sensor module as wireless sensor module group. The skin status of each region was evaluated at 1, 12, 24, 48 hours after application, and the score according to the skin irritation score standard was recorded. (6) The corresponding material extract was prepared by adding 1 mL serum-free Dulbecco's modification of Eagle's medium (DMEM) per 1 square centimeter surface area of the pressure sensor or flexible cable with temperature and humidity sensor welded respectively. L-929 fibroblasts were divided into pressure sensor extract group, flexible cable extract group, phenol control group, and medium control group. The corresponding extract was added in the first two groups, the phenol control group was added with 64 g/L phenol, and the medium control group was cultured with serum-free DMEM. The total volumes of the above four groups were all 100 µL. The absorbance values on the 2nd, 4th, 7th day of culture were detected by methyl thiazolyl tetrazolium method to calculate the cell proliferation rate (n=6 at each time point) and to grade the cytotoxicity. Data were statistically analyzed with paired samples t test, Wilcoxon signed rank test, Pearson correlation analysis, Spearman correlation analysis, Mann-Whitney U test, analysis of variance for repeated measurement, analysis of variance for factorial design, one-way analysis of variance, and Bonferroni correction. Results: (1) The smart phone successfully received the air temperature, humidity, and pressure information detected by the wireless sensor module through the Bluetooth function. (2) The temperature of the hot water bag measured by the wireless sensor module was (37.7±1.7) ℃, which was close to (37.7±1.7) ℃ of the infrared thermometer (t=-0.112, P>0.05), and there was a significant positive correlation between them (r=0.996, P<0.01). (3) The negative pressure of arm under negative pressure material measured by the wireless sensor module was -36.7 (-38.8, -27.4) kPa, which was significantly lower than -22.7 (-32.7, -12.5) kPa of negative pressure meter (Z=-3.235, P<0.01), but there was a significant positive correlation between their absolute values (ρ=1.000, P<0.01). (4) There was no abnormal toxic reaction in all groups of rats, and there was no statistically significant difference in body mass among the four groups of mice (F=3.132, P>0.05). (5) The scores of skin irritation in application region of rats in the two groups were similar at 1, 12, 24, 48 hours after application (Z=-1.000, <0.001, -0.620, <0.001, P>0.05). (6) At each time point of culture, compared with that of medium control group, the cell proliferation rate increased significantly in pressure sensor extract group and flexible cable extract group (P<0.01) but decreased significantly in phenol control group (P<0.01). On the 2nd, 4th, 7th day of culture, the cytotoxicity grade of phenol control group was 1, 1, and 2 respectively, and the cytotoxicity grade of each extract group was 0. Conclusions: The wireless sensor module integrates temperature, humidity, and pressure sensors, which can monitor local temperature and pressure and realize the visualization of parameters on the mobile application program. The measurement of temperature is accurate and the pressure measurement results are consistent with the values of the negative pressure meter with good biosafety. It possesses a big value in clinical application and prospects for development.


Assuntos
Drenagem , Animais , Feminino , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Coelhos , Ratos , Temperatura , Vácuo
7.
Water Res ; 182: 115965, 2020 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-32673861

RESUMO

The control of dissolved methane (CH4) and hydrogen sulfide (H2S) emissions in anaerobic effluents is essential for minimizing the environmental implications of greenhouse gases, odor, and carbon footprint, as well as for preventing energy loss in the form of unrecovered dissolved methane. This study assessed the feasibility of a vacuum degasifier for the removal of CH4 and H2S from staged anaerobic fluidized membrane bioreactor (SAF-MBR) effluent. The optimization results showed that the efficiency of the nozzle fitted degasifiers were superior to the media packed ones. In three-stage vacuum degasifiers at a -0.8 bar vacuum pressure, H2S removal was mostly pH dependent and 88% removal efficiency was achieved with an initial concentration of 13.6 mg/L. Methane removal was dependent primarily on the number of degasifier units, and approximately 94% efficiency was achieved in a three-stage degasifier. Energy balance analysis showed that energy production exceeded the system energy requirements with 0.05-0.07 kWh/m3 of surplus energy. These results provide deep insights into this new technology for simultaneous removal of dissolved CH4 and H2S, which can be referred for potential future applications.


Assuntos
Sulfeto de Hidrogênio , Águas Residuárias , Anaerobiose , Reatores Biológicos , Metano , Vácuo , Eliminação de Resíduos Líquidos
9.
Food Chem ; 332: 127407, 2020 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-32645677

RESUMO

This study aimed to investigate the difference between ginger slices (vertically cut) and splits (horizontally cut) during microwave-vacuum drying (MVD) procedures. MVD ginger slices showed a higher shrinkage rate and a higher hardness value, with a more porous structure of the surface layer. MVD ginger splits had higher rehydration rates at the first 15 min of the rehydration. Nine optimal wavelengths were selected by regression coefficients (RC) from the partial least squares regression (PLSR) model based on the raw data. A simplified PLSR model based on optimal wavelengths showed a good performance with a coefficient of determination in prediction (Rp2) of 0.973 and a root mean square error in prediction (RMSEP) of 4.63%. Texture features of grey level co-occurrence matrix (GLCM) of moisture prediction maps demonstrated a more uniform moisture distribution in MVD ginger slices than that in splits in the original geometry.


Assuntos
Dessecação/métodos , Gengibre/fisiologia , Micro-Ondas , Gengibre/química , Análise dos Mínimos Quadrados , Microscopia Eletrônica de Varredura , Vácuo , Água/química
10.
Food Chem ; 333: 127502, 2020 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-32683257

RESUMO

The aim of this study was to evaluate the effectiveness of the use of ethanol, ultrasound and/or vacuum as a pretreatment to melon drying. Eight types of pretreatments were performed in which samples were immersed in ethanol solutions with different concentrations (50% and 100%) using four treatment conditions: immersion, immersion with ultrasound (US), with vacuum (VC) and with ultrasound and vacuum (USVC). Drying was performed at 60 °C and five different semi-theoretical drying mathematical models were examined to characterize the drying curves, and quality analyses were carried out. The condition that obtained the lower drying time was using the US pretreatment in 100% ethanol solution. Drying caused a diminution of bioactive compounds and influenced color parameters. However, the samples immersed in 50% ethanol solution and dried obtained minor losses of total phenolics, total carotenoids, and ascorbic acid contents.


Assuntos
Cucurbitaceae/química , Etanol/farmacologia , Conservação de Alimentos/métodos , Conservantes de Alimentos/farmacologia , Ácido Ascórbico/análise , Carotenoides/química , Cor , Cucurbitaceae/efeitos dos fármacos , Dessecação , Conservação de Alimentos/instrumentação , Frutas/química , Frutas/efeitos dos fármacos , Fenóis/química , Vácuo
11.
Br J Radiol ; 93(1114): 20190994, 2020 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-32649240

RESUMO

OBJECTIVE: Better cosmetic outcome after vacuum assisted excision (VAE) compared to surgical excision of benign breast lesions is suggested in previous studies but has never been evaluated with validated outcome measures. In this study, patient reported cosmetic outcome after VAE was evaluated. METHODS: Patients who underwent VAE between July 2017 and December 2018 were invited to complete the cosmetic subscale of the Dutch Breast Cancer Treatment Outcome Scale, comparing the treated with the untreated breast. Response mode ranged from 1 (no difference) to 4 (large difference) and cosmetic outcome was calculated as the unweighted mean. Clinical outcomes included: tumor size, number of cores, complications, residual lesions and recurrences. RESULTS: Response rate was 73.4% (47 of 64 patients). Median tumor size was 15 mm (range 5-51 mm) and median number of cores 6.5 (range 1-85), complete excision was confirmed in all but two patients. Mean cosmetic outcome was good (mean score ≤1.75) in 74% of patients and no patients reported a poor cosmetic outcome (mean score >3.25). A hematoma occurred in five patients (one needed aspiration) and a skin rash in one patient, no patients developed an infection or seroma. CONCLUSION: In this study VAE is safe and effective for tumors up to 5 cm and patient reported cosmetic outcome was good. Patients with benign lesions could benefit from VAE as an alternative for surgical excision. ADVANCES IN KNOWLEDGE: A formal quantitative measurement of cosmetic outcome after vacuum assisted excision for benign breast lesions was still lacking. This study shows that this cosmetic outcome is overall good in benign lesions up to 5 cm.


Assuntos
Neoplasias da Mama/cirurgia , Estética , Medidas de Resultados Relatados pelo Paciente , Adulto , Idoso , Biópsia com Agulha de Grande Calibre , Neoplasias da Mama/patologia , Estudos Transversais , Feminino , Humanos , Pessoa de Meia-Idade , Países Baixos , Vácuo
12.
In Vivo ; 34(3 Suppl): 1651-1659, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: covidwho-543430

RESUMO

BACKGROUND/AIM: Coronavirus-19 (COVID-19) pandemic outbreak is currently having a huge impact on medical resource allocation. Breast Cancer (BC) patients are concerned both with BC treatment and COVID-19. This study aimed to estimate the impact of anxiety among patients, caused by the spreading of COVID-19. PATIENTS AND METHODS: Between the 16th of January and the 20th of March 2020, we retrospectively enrolled 160 patients. Eighty-two patients with a suspected breast lesion (SBL) were divided into two groups: PRE-COVID-19-SBL and POST-COVID-19-SBL. Seventy-eight BC patients were divided into PRE-COVID-19-BC and POST-COVID-19-BC. Patient characteristics including age, marital status, SBL/BC diameter, personal and family history of BC, clinical stage and molecular subtype were recorded. Procedure Refusal (PR) and Surgical Refusal (SR) were also recorded with their reason. RESULTS: BC and SBL analysis showed no difference in pre-treatment characteristics (p>0.05). Both POST-COVID-19-SBL and POST-COVID-19-BC groups showed higher rates of PR and SR (p=0.0208, p=0.0065 respectively). Infection risk represented primary reason for refusal among POST-COVID-19 patients. CONCLUSION: COVID-19-related anxiety could affect patients' decision-making process.


Assuntos
Ansiedade/psicologia , Biópsia com Agulha de Grande Calibre/psicologia , Neoplasias da Mama/psicologia , Infecções por Coronavirus/psicologia , Tomada de Decisões , Procedimentos Cirúrgicos Eletivos/psicologia , Medo/psicologia , Mastectomia/psicologia , Pneumonia Viral/psicologia , Recusa do Paciente ao Tratamento/psicologia , Idoso , Idoso de 80 Anos ou mais , Ansiedade/etiologia , Atitude Frente a Saúde , Biópsia com Agulha de Grande Calibre/métodos , Neoplasias da Mama/diagnóstico por imagem , Neoplasias da Mama/patologia , Neoplasias da Mama/cirurgia , Feminino , Humanos , Itália , Mamografia , Pessoa de Meia-Idade , Pandemias , Estudos Retrospectivos , Fatores Socioeconômicos , Ultrassonografia Mamária , Vácuo
13.
J Card Surg ; 35(8): 1787-1792, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32557825

RESUMO

PURPOSE: Despite paucity of data, there exists growing popularity of catheter-based extraction methods for intravascular thrombi and vegetations. We describe a large single center experience with vacuum-assisted extraction techniques (VAET) for right-sided intravascular and cardiac masses. METHODS: We retrospectively reviewed the perioperative course of patients undergoing VAET between 2014 and 2019. Primary outcomes were survival and freedom from recurrent bacteremia. Procedural success was a composite definition of survival, majority of mass extraction, absence of recurrent bacteremia, and valve function not requiring further intervention during index hospitalization. RESULTS: Of the entire cohort (n = 58), 48% and 52% underwent VAET for vegetations and sterile thrombi, respectively. Of those with positive cultures, the most common organism isolated was Staphylococcus aureus (48%). Preoperative active bacteremia was present in 36% (21/58) and of these patients, 76% (16/21) had neither recurrent nor persistent bacteremia post-op. The majority of masses (67%, 38/58) were debulked with an average reduction in size of 42%. Conversion to open surgery occurred in 3.5% (2/58). Intraoperative and 30-day survival were 98% (57/58) and 90% (28/31), respectively. Overall success was 86% (50/58). The prevalence of moderate/severe tricuspid regurgitation was 37% pre-op and 61% post-op. Average length of intensive care unit and overall hospital stay was 5.6 and 16 days, respectively. CONCLUSIONS: In this single center experience, VAET was conducted safely with a high degree of success and freedom from short-term recurrent bacteremia. This minimally invasive procedure is an attractive alternative to traditional open techniques for removal of right-sided intravascular and cardiac masses.


Assuntos
Embolectomia/métodos , Vácuo , Trombose Venosa/cirurgia , Procedimentos Cirúrgicos Cardíacos/métodos , Humanos , Estudos Retrospectivos , Fatores de Tempo
14.
Rev Lat Am Enfermagem ; 28: e3263, 2020.
Artigo em Português, Espanhol, Inglês | MEDLINE | ID: mdl-32491118

RESUMO

OBJECTIVE: to develop and validate the first immersive virtual reality simulation addressing vacuum blood collection in adult patients - VIDA-Nursing v1.0. METHOD: methodological study to validate 14 steps of the vacuum blood collection procedure in adults, designed to develop the immersive virtual reality simulator VIDA-Nursing v1.0. It was assessed by 15 health workers and 15 nursing undergraduate students in terms of visual, interactive, movement simulation reality, teaching and user-friendly aspects. RESULTS: the workers considered 79.6% of the items to be valid, while the students considered 66.7% of the items valid; most of the demands can be implemented in the system by improving future versions. CONCLUSION: the simulator was considered a promising and innovative tool to teach vacuum blood collection in adults as it can be combined with other resources currently used to introduce this topic and technique in the education of undergraduate nursing students.


Assuntos
Coleta de Amostras Sanguíneas/métodos , Bacharelado em Enfermagem/métodos , Treinamento por Simulação/métodos , Estudantes de Enfermagem , Realidade Virtual , Adulto , Coleta de Amostras Sanguíneas/instrumentação , Coleta de Amostras Sanguíneas/normas , Feminino , Humanos , Invenções , Masculino , Pessoa de Meia-Idade , Vácuo , Adulto Jovem
15.
In Vivo ; 34(3 Suppl): 1651-1659, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32503825

RESUMO

BACKGROUND/AIM: Coronavirus-19 (COVID-19) pandemic outbreak is currently having a huge impact on medical resource allocation. Breast Cancer (BC) patients are concerned both with BC treatment and COVID-19. This study aimed to estimate the impact of anxiety among patients, caused by the spreading of COVID-19. PATIENTS AND METHODS: Between the 16th of January and the 20th of March 2020, we retrospectively enrolled 160 patients. Eighty-two patients with a suspected breast lesion (SBL) were divided into two groups: PRE-COVID-19-SBL and POST-COVID-19-SBL. Seventy-eight BC patients were divided into PRE-COVID-19-BC and POST-COVID-19-BC. Patient characteristics including age, marital status, SBL/BC diameter, personal and family history of BC, clinical stage and molecular subtype were recorded. Procedure Refusal (PR) and Surgical Refusal (SR) were also recorded with their reason. RESULTS: BC and SBL analysis showed no difference in pre-treatment characteristics (p>0.05). Both POST-COVID-19-SBL and POST-COVID-19-BC groups showed higher rates of PR and SR (p=0.0208, p=0.0065 respectively). Infection risk represented primary reason for refusal among POST-COVID-19 patients. CONCLUSION: COVID-19-related anxiety could affect patients' decision-making process.


Assuntos
Ansiedade/psicologia , Biópsia com Agulha de Grande Calibre/psicologia , Neoplasias da Mama/psicologia , Infecções por Coronavirus/psicologia , Tomada de Decisões , Procedimentos Cirúrgicos Eletivos/psicologia , Medo/psicologia , Mastectomia/psicologia , Pneumonia Viral/psicologia , Recusa do Paciente ao Tratamento/psicologia , Idoso , Idoso de 80 Anos ou mais , Ansiedade/etiologia , Atitude Frente a Saúde , Biópsia com Agulha de Grande Calibre/métodos , Neoplasias da Mama/diagnóstico por imagem , Neoplasias da Mama/patologia , Neoplasias da Mama/cirurgia , Feminino , Humanos , Itália , Mamografia , Pessoa de Meia-Idade , Pandemias , Estudos Retrospectivos , Fatores Socioeconômicos , Ultrassonografia Mamária , Vácuo
17.
Ecotoxicol Environ Saf ; 201: 110810, 2020 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-32521369

RESUMO

Heavy metals pollution in river sediments is irreversible, and it is not easy to be found to be concealed. The pollution of heavy metals for river sediments is currently a serious environmental problem. In the paper, the Bacillus subtilis was selected to remove heavy metals by bio-mineralization method in river sediments. Optimal content of Bacillus subtilis powder and organophosphate monoester was 20 g and 0.2 mol in 1 L of bacterial solution, respectively. The optimum reaction time and temperature were 36 h and 30 °C, respectively. The optimal reaction conditions were applied to zinc ions in river sediments. After heavy metals treatment, there was little effect on the water content before and after flocculation and vacuum preloading. Treatment of heavy metals had no effect on the cross-plate shear strength of river sediments after vacuum preloading. After treatment of heavy metals, the effect of purifying water quality was the group B(Polyacrylamide + Polysilicate aluminium ferric) bigger than the group A (Polyacrylamide). The removal efficiency of zinc ions (Zn2+) in the group B was 89.59% and 74.99% before and after the vacuum preloading, respectively, which was better than that in the group A.


Assuntos
Bacillus subtilis/metabolismo , Floculação , Sedimentos Geológicos/química , Metais Pesados/análise , Rios/química , Vácuo , Poluentes Químicos da Água/análise , Biodegradação Ambiental , China , Sedimentos Geológicos/microbiologia , Metais Pesados/metabolismo , Medição de Risco , Rios/microbiologia , Poluentes Químicos da Água/metabolismo
18.
J Vis Exp ; (160)2020 06 13.
Artigo em Inglês | MEDLINE | ID: mdl-32597872

RESUMO

Accurate control of the polarization states of laser light is important in precision measurement experiments. In experiments involving the use of a vacuum environment, the stress-induced birefringence effect of the vacuum windows will affect the polarization states of laser light inside the vacuum system, and it is very difficult to measure and optimize the polarization states of the laser light in situ. The purpose of this protocol is to demonstrate how to optimize the polarization states of the laser light based on the fluorescence of ions in the vacuum system, and how to calculate the birefringence of vacuum windows based on azimuthal angles of external wave plates with Mueller matrix. The fluorescence of 25Mg+ ions induced by laser light that is resonant with the transition of |32P3/2,F = 4, mF = 4 â†’ |32S1/2,F = 3, mF = 3 is sensitive to the polarization state of the laser light, and maximum fluorescence will be observed with pure circularly polarized light. A combination of half-wave plate (HWP) and quarter-wave plate (QWP) can achieve arbitrary phase retardation and is used for compensating the birefringence of the vacuum window. In this experiment, the polarization state of the laser light is optimized based on the fluorescence of 25Mg+ ion with a pair of HWP and QWP outside the vacuum chamber. By adjusting the azimuthal angles of the HWP and QWP to obtain maximum ion fluorescence, one can obtain a pure circularly polarized light inside the vacuum chamber. With the information on the azimuthal angles of the external HWP and QWP, the birefringence of the vacuum window can be determined.


Assuntos
Birrefringência , Fluorescência , Vácuo
19.
Khirurgiia (Mosk) ; (4): 77-80, 2020.
Artigo em Russo | MEDLINE | ID: mdl-32352674

RESUMO

Pneumomediastinum and subcutaneous emphysema are the main manifestations of gas syndrome in patients with tracheal injury. Traditional mediastinal decompression in case of tension emphysema is carried out through different types of cervical or transpleural mediastinotomy and subsequent passive drainage. Clinical observation of the use of VAC-therapy in the patient with injury of the membranous part of trachea followed by tension pneumomediastinum is presented. Cervicotomy with dissection of anterior mediastinum and installation of vacuum-assisted dressing were performed. Fast regression of subcutaneous emphysema and relief of pneumomediastinum were noted. There were no complications. The patient was discharged in 6 days after admission. Effectiveness of VAC-therapy in patients with tension subcutaneous emphysema and pneumomediastinum was confirmed.


Assuntos
Enfisema Mediastínico/terapia , Tratamento de Ferimentos com Pressão Negativa , Pneumotórax/terapia , Enfisema Subcutâneo/terapia , Traqueia/lesões , Humanos , Enfisema Mediastínico/etiologia , Pescoço , Pneumotórax/etiologia , Enfisema Subcutâneo/etiologia , Vácuo
20.
Bioresour Technol ; 312: 123572, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32470829

RESUMO

Microwave vacuum pyrolysis of palm kernel shell was examined to produce engineered biochar for application as additive in agriculture application. The pyrolysis approach, performed at 750 W of microwave power, produced higher yield of porous biochar (28 wt%) with high surface area (270 cm2/g) compared to the yield obtained by conventional approach (<23 wt%). Addition of the porous biochar in mushroom substrate showed increased moisture content (99%) compared to the substrate without biochar (96%). The mushroom substrate added with biochar (150 g) was optimal in shortening formation, growth, and full colonization of the mycelium within one month. Using 2.5% of the biochar in mushroom substrate desirably maintained the optimum pH level (6.8-7) during the mycelium colonization period, leading to high mycelium growth (up to 91%) and mushroom yield (up to 280 g). The engineered biochar shows great potential as moisture retention and neutralizing agent in mushroom cultivation.


Assuntos
Agaricales , Pirólise , Carvão Vegetal , Concentração de Íons de Hidrogênio , Micro-Ondas , Vácuo
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA