Biomimetic Hydroxyapatite Growth on Functionalized Surfaces of Ti-6Al-4V and Ti-Zr-Nb Alloys

A biomimetic approach for coating titanium-containing alloys with hydroxyapatite (HA) is reported in the article. Two types of Ti-containing alloys were chosen as an object for coating: Ti-6Al-4V (recommended for orthopedic application) and a novel highly biocompatible Ti-Zr-Nb alloy, with good mechanical compatibility due to a modulus that is more close to that of human bones (E ≈ 50 GPa instead of 110 GPa in Ti-6Al-4V). Coating process was carried out in a 10×-concentrated simulated body fluid (SBF)—synthetic analog of human body plasma. The effect of oxidized and carboxylated alloy surface on formation of biomimetic hydroxyapatite has been studied. By XRD, we found influence of thermal conditions on HA crystal formation and size. SEM images and Fourier transform infrared confirmed that hydroxyapatite with different morphology, crystallinity, and Ca/P ratio formed on metallic surfaces. X-ray photoelectron spectroscopy showed that in the Ti-6AL-4V sample the observed Ca/P ratio reach 0.97, whereas in the Ti-Zr-Nb sample the observed Ca/P ratio reach 1.15

Tájékoztató jelentés az őszi mezőgazdasági munkákról (2015. november 16-i operatív jelentések alapján)

A kiadvány a statisztikáról szóló 1993. évi XLVI. törvény (Stt.) 8.§ (2) bekezdése alapján készült el. Az adatszolgáltatás a Stt. felhatalmazása alapján kiadott Országos Statisztikai Adatgyűjtési Program keretein belül történt. A Nemzeti Agrárkamara (NAK) közreműködésével begyűjtött adatok a őszi mezőgazdasági munkák állásáról adnak tájékoztatást

Dietary Acrylamide Intake and the Risk of Lymphatic Malignancies: The Netherlands Cohort Study on Diet and Cancer

BACKGROUND: Acrylamide, a probable human carcinogen, is present in many everyday foods. Since the finding of its presence in foods in 2002, epidemiological studies have found some suggestive associations between dietary acrylamide exposure and the risk of various cancers. The aim of this prospective study is to investigate for the first time the association between dietary acrylamide intake and the risk of several histological subtypes of lymphatic malignancies. METHODS: The Netherlands Cohort Study on diet and cancer includes 120,852 men and women followed-up since September 1986. The number of person years at risk was estimated by using a random sample of participants from the total cohort that was chosen at baseline (n =5,000). Acrylamide intake was estimated from a food frequency questionnaire combined with acrylamide data for Dutch foods. Hazard ratios (HRs) were calculated for acrylamide intake as a continuous variable as well as in categories (quintiles and tertiles), for men and women separately and for never-smokers, using multivariable-adjusted Cox proportional hazards models. RESULTS: After 16.3 years of follow-up, 1,233 microscopically confirmed cases of lymphatic malignancies were available for multivariable-adjusted analysis. For multiple myeloma and follicular lymphoma, HRs for men were 1.14 (95% CI: 1.01, 1.27) and 1.28 (95% CI: 1.03, 1.61) per 10 µg acrylamide/day increment, respectively. For never-smoking men, the HR for multiple myeloma was 1.98 (95% CI: 1.38, 2.85). No associations were observed for women. CONCLUSION: We found indications that acrylamide may increase the risk of multiple myeloma and follicular lymphoma in men. This is the first epidemiological study to investigate the association between dietary acrylamide intake and the risk of lymphatic malignancies, and more research into these observed associations is warranted

Variation in clinical presentation, complications and outcomes for Māori and Pacific peoples among hospitalised adults with COVID-19 in 2022, Aotearoa New Zealand.

BACKGROUND: Pacific region-specific data on the clinical course of COVID-19 are limited. We aimed to describe clinical features and outcomes from Aotearoa New Zealand patients, focusing on Māori and Pacific peoples. METHODS: We conducted a retrospective cohort study among adults (≥16 years) hospitalised due to COVID-19 at 11 hospitals from January to May 2022. We included all Māori and Pacific patients and every second non-Māori, non-Pacific (NMNP) patient using data from chart review and national datasets. RESULTS: Of 2319 patients, 582 (25%) were Māori, 914 (39%) Pacific peoples and 862 NMNP (median age 52, 57 and 63 years respectively). Vaccination coverage (≥2 doses) was 73.4% (n = 437) for Māori, 76.7% (n = 701) for Pacific peoples (n = 701) and 84.8% (n = 731) for NMNP. Among 832 (35.9%) with complications, Māori had a greater risk than NMNP of acute kidney injury (risk ratio (RR) 1.87, P < 0.001), cardiac arrhythmia (RR = 1.60, P = 0.023), shock (RR = 2.64, P = 0.005), myocardial infarction (RR 2.21, P = 0.042), cardiac arrest (RR 2.68, P = 0.046) and acute respiratory distress syndrome (RR = 2.81, P = 0.008). Pacific patients experienced a greater risk than NMNP of acute kidney injury (RR = 2.18, P < 0.001) and pneumonia (RR = 1.32, P = 0.047) and a lower risk of thromboembolism (RR = 0.35, P = 0.004) and myocarditis/pericarditis (RR = 0.23, P = 0.003). During admission, 23 (3.3%) Māori, 36 (3.9%) Pacific and 28 (3.2%) NMNP patients died, with no difference in age-standardised mortality. CONCLUSIONS: The clinical course of patients hospitalised by COVID-19 varied between ethnic groups, likely reflecting differential access to social determinants of health. Healthcare services that respond to this variability are needed to achieve the highest attainable health for all

Interaction of Albumin and Immunoglobulin G with Synthetic Hydroxyapatite

It was shown by X-ray phase analysis, IR spectra analysis and MALDI-ToF mass spectrometry methods that interaction of synthetic hydroxyapatite with a solution of immunoglobulin G leads to its partial dissolution due to leaching from the surface of calcium triphosphate which, in our opinion, forms complexes with immunoglobulin G.</jats:p

INTERACTION OF ALBUMIN AND IMMUNOGLOBULIN G WITH SYNTHETIC HYDROXYAPATITE

It was shown by X-ray phase analysis, IR spectra analysis and MALDI-ToF mass spectrometry methods that interaction of synthetic hydroxyapatite with a solution of immunoglobulin G leads to its partial dissolution due to leaching from the surface of calcium triphosphate which, in our opinion, forms complexes with immunoglobulin G

Structural and molecular-weight-dependency in the formation of lignin nanoparticles from fractionated soft- and hardwood lignins

The diagram showing how the size, shape, and dispersity of the LNPs is depending on the structural properties of initial lignin and how they can be tailored by changing lignin concentration and by applying lignins with different molecular weights.</p