1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.

Surface and Colloid Science

(1976). Nuclear Tracks in Solids (Principles and Applications) Nuclear Technology: Vol. 30, No. 1, pp. 91-92.

Nuclear Tracks in Solids (Principles and Applications)

Author(s): Chen, Fanqing; Gerion, Daniele | Abstract: One of the biggest challenges in cell biology is the imaging of living cells. For this purpose, the most commonly used visualization tool is fluorescent markers. However, conventional labels, such as organic fluorescent dyes or green fluorescent proteins (GFP), lack the photostability to allow the tracking of cellular events that happen over minutes to days. In addition, they are either toxic to cells (dyes), or difficult to construct and manipulate (GFP). We report here the use of a new class of fluorescent labels, silanized CdSe/ZnS nanocrystal-peptide conjugates, for imaging the nuclei of living cells. CdSe/ZnS nanocrystals, or so called quantum dots (qdots), are extremely photostable, and have been used extensively in cellular imaging of fixed cells. However, most of the studies about living cells so far have been concerned only with particle entry into the cytoplasm or the localization of receptors on the cell membrane. Specific targeting of qdots to the nucleus of living cells has not been reported in previous studies, due to the lack of a targeting mechanism and proper particle size. Here we demonstrate for the first time the construction of a CdSe/ZnS nanocrystal-peptide conjugate that carries the SV40 large T antigen nuclear localization signal (NLS), and the transfection of the complex into living cells. By a novel adaptation of commonly used cell transfection techniques for qdots, we were able to introduce and retain the NLS-qdots conjugate in living cells for up to a week without detectable negative cellular effects. Moreover, we can visualize the movement of the CdSe/ZnS nanocrystal-peptide conjugates from cytoplasm to the nucleus, and the accumulation of the complex in the cell nucleus, over a long observation time period. This report opens the door for using qdots to visualize long-term biological events that happen in the cell nucleus, and provides a new nontoxic, long-term imaging platform for cell nuclear processes.

/pdf/fluorescent-cdse-zns-nanocrystal-peptide-conjugates-for-long-i96546wo0h.pdf

Fluorescent CdSe/ZnS nanocrystal-peptide conjugates for long-term, nontoxic imaging and

2D Black Phosphorus–Based Biomedical Applications

Ammonia gas sensors: A comprehensive review.

Nanoparticles of NixZn0.5−xCo0.5Fe2O4 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) were synthesized by co-precipitation method. Samples were characterized by X-ray diffraction and laser-induced breakdown spectroscopy. The XRD patterns of ferrites demonstrate the evidence of spinel cubic structure. Calculations show that the particle size increases and lattice parameter decreases by increasing nickel concentration. The emission characteristics of plasma generated by a Q-switched Nd:YAG laser operating at its fundamental harmonic (1064 nm) are investigated for all the six samples. Plasma temperature is calculated by Boltzmann plot method. The plasma temperature is found to decrease by decreasing laser energy and as the nickel concentration increases and zinc concentration decreases.

Optical Emission Spectroscopy of Nickel-Substituted Cobalt–Zinc Ferrite

Recoil momentum due to ablated products in the laser ablation process is the dominant source of thrust generation. The total momentum comprises the laser-supported shock wave in background gas and the momentum due to material flow. Based on experimental studies, the dependence of laser ablation propulsion parameters of metal foils has been investigated in atmospheric air. A Q-switched Nd:YAG laser operating at fundamental (1064 nm) and second harmonics (532 nm) is used to irradiate the target. Each sample's ablation is performed over a range of laser fluence values (106 to 107 J/cm2), which is achieved by varying the incoming laser energy per pulse and adjusting the focused beam spot diameter. The results obtained from these studies showed that the laser ablation propulsion parameters are influenced by laser parameters. Moreover, the target properties also plays significant role in calculating propulsion parameters which vary with wavelength. The highest Cm is obtained for Cu irradiated with 2.2 × 10–4 Ns/J laser pulse using fundamental harmonics at low laser fluence up to 1.5 × 106 J/cm2while at the highest fluence Fe gives higher Cm 1.810–4 Ns/J because of the difference in the physical properties of metal foils. As expected, changing the energy per pulse of the laser also affects the laser ablation propulsion efficiency. The Isp for Fe is highest for both harmonics i-e 41,675 s and 3490 s, respectively. The reason behind this is that the optical properties of Fe vary by changing wavelength. Such higher Isp is required for long-range missions, so Fe proved to be the best propellant.

Quantitative Measurements of Ablative Laser Propulsion Parameters of Metal Foils Using Pulsed Nd:YAG Laser

Degradation of persistent organic pollutant using Ag-doped ZnO-ZnS–polyaniline composite as photocatalyst

Although starch based materials have an array of fascinating industrial applications, the native starches do not show good mechanical strength, thermal stability, and rheological properties for their use in the mainstream processing industry. For example, the use of starches for producing controlled release fertilizers is a new research endeavor with detailed knowledge still to come. The thermal processing of native starches with water as a plasticizer results in poor physical and pasting properties of the final product. Therefore in this study, corn starch was thermally processed with urea and borate in a water medium. The pure starch (PS), starch-urea (SU), starch-borate (SB), and starch-urea-borate (SUB) samples were prepared and characterized for their rheological traits. The PS sample exhibited a peak viscosity of 299 cP after 17 min of thermal processing. Further heating of the suspension caused a decrease in viscosity of 38 points due to thermal cracking of the starch granules. A similar trend was depicted in the viscosity measurements of SU, SB, and SUB adhesives. However, the viscosity of these samples remained slightly higher than that for PS. Also, the reduction in viscosity after the peak value was not as notable as for PS. The modified starch behaved like a gel and its storage modulus was significantly higher than the loss modulus. The lower magnitudes of storage and loss moduli revealed that the modified starch was in the form of a weak gel and not a solid. The PS is more fluid in nature with dominating loss modulus at lower angular frequencies.

https://www.mdpi.com/2073-4360/9/9/361/pdf

Yasir Jamil

Papers

Optical Emission Spectroscopy of Nickel-Substituted Cobalt–Zinc Ferrite

Quantitative Measurements of Ablative Laser Propulsion Parameters of Metal Foils Using Pulsed Nd:YAG Laser

Degradation of persistent organic pollutant using Ag-doped ZnO-ZnS–polyaniline composite as photocatalyst

Effect of Urea and Borate Plasticizers on Rheological Response of Corn Starch.

Synthesis, Characterization and Machine Learning Assisted Optical Emission Studies of Dysprosium doped Bismuth Ferrites