17 Posts in October Archive

Reversing a string

Problem: Reverse a user-input string and write it to a file

Solution: In Python, there are a number of ways to reverse a string. The most direct method involves reading the characters in reverse and performing a concatenation on them. By far the most elegant way to do it is:

>>> 'hello'[::-1]
'olleh'

The reversed() function does not do the trick, as it is meant to work on things like iterators.

Writing the result to a file should involve the ...

Aerosol

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“Emerging Issues in Nanoparticle Aerosol Science and Technology (NAST)”

paper10

Electrostatics and nanoparticles: What’s the same, what’s different?

Mark N. Horenstein

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The paper illustrated creating, manipulating and utilization of nanoparticles. I looked this paper to know what types of generations are used. For generating solid nanoparticles, there are many methods. Electrospary and evaporation method, plasma spray, laser ablation, arc discharges and commercial park generator.

paper9

Aerosol generation and measurement of multi-wall carbon nanotubes

Toshihiko Myojo Æ Takako Oyabu Æ Kenichiro Nishi Æ Chikara Kadoya Æ Isamu Tanaka Æ Mariko Ono-Ogasawara Æ Hirokazu Sakae Æ Tadashi Shirai

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The paper is about the determining the characterization of aerosolized multi-walled carbon nanotubes. Palas RBS-1000 was used to generate particles then they go to the two-component fluidized bed. A condensation particle counter and a Nanoparticle Surface Area Monitor were used to characterize the number and surface concentration of ...

paper8

Imaging nanoparticles in cells by nanomechanical holography

LAURENE TETARD1,2, ALI PASSIAN1,2*, KATHERINE T. VENMAR1, RACHEL M. LYNCH1, BRYNN H. VOY1, GAJENDRA SHEKHAWAT3, VINAYAK P. DRAVID3 AND THOMAS THUNDAT1,2

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The article is about how the SNFUH is well observed the nanoparticles uptake on cell. Single-walled carbon nanohorns (SWCNHs) were used. Cell, Erythrocytes and peripheral blood samples were used to see the nanoparticles uptake. Lastly, to verify the result that the SNFUH is good method to see nanoparticle ...

iGEM IMPTools

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Homework 5

A 10mV/C input is converted to a 10mV/F output

1) State A is the non-inverting amplifier, stage B is the inverting adder and stage C is the inverter-follower. Can you modify Stage B so that Stage C is not required? (Look up a non-inverting adder)

2) Construct a circuit that performs the reverse operation, i.e. converts a 10mV/F input to a 10mV/C output.

3) Construct an active band pass circuit to isolate a band of ...

Op Amp Circuits

Here's a link to a comprehensive list of operational amplifier circuit from National Instruments. It includes both measurement and signal generation circuits.

Here's another one from Texas instruments for some of the basic circuits built in single supply configurations.

Biasing the BJT

Biasing the transistor for proper operation is somewhat tricky. You never want to rely on the transistor beta for reliable performance. Following is an idea for biasing the transistor so that when the signal coming in at Vin is close to ground, the output is at the middle of the full voltage range (10V for 0-20 range).

The following rules apply:

1. When Vin = 0, the 110k and 10k resistors form a voltage divider, such that the voltage at the base ...

Study Abroad

Study abroad programs give students the opportunity to experience the life in another country, thus broadening their perspective on their own professional careers and personal lives. More and more, employers are looking for this international experience in their recruits. I encourage you to take a look at the flyer, and please get in touch with your adviser or Ms. Boone for more information.

paper7

Effects of nanomaterial physicochemical properties on in vivo toxicity

Kristin L. Aillona, b, Yumei Xiea, Nashwa El-Gendya, b, Cory J. Berklanda, b and M. Laird Forresta

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To examine the intracellular uptake of the Au NPs, confocal fluorescence microscopy was used. Uptaking of the NPs were result from receptor-mediated endocytosis and clathrin-mediated process More free energy generates from wrapping time and the receptor-ligand interaction for NPs into the cell. Transferrin-coated rod-shaped NPs uptakes less than transferring-coated spherical NPs. Uptake of ...

paper6

Elucidating the Mechanism of Cellular Uptake and Removal of Protein-Coated Gold Nanoparticles of Different Sizes and Shapes

B. Devika Chithrani†,‡ and Warren C. W. Chan*,†,‡,§

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Interaction of nanomaterials with the mitochondria and cell nucleus and interaction with surrounding environment (blood components, immune system. Metabolic modification of nanomaterials) are main mechanisms of nanoparticle toxicity.

Dendrimers – size and generation; exposure duration; biodistribution; and the rate, location and mechanism of metabolism is related to the dendrimer toxicity. Cationic amine terminal groups are ...

paper5

Toxicological effects of multi-wall carbon nanotubes in rats

Aihong Liu Æ Kangning Sun Æ Jiafeng Yang Æ Dongmei Zhao

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The lung toxicity of multi-wall carbon nanotubes was studied by the X-ray diffraction and Transmission Electron Microscopy. Male Vister rats were used for experiment.

Exposed to different dose MWCNTs by intratracheal instillation – 3, 5 and 7 mg/kg dose – high dose has more inflammation

Different exposure time (Rat exposed to MUCNTs of 3mg/kg) – The longer exposure time, the thicker ...

paper4

Acute Toxicity and Prothrombotic Effects of Quantum Dots:Impact of Surface Charge

Jorina Geys,1 Abderrahim Nemmar,1,2 Erik Verbeken,3 Erik Smolders,4 Monica Ratoi,5 Marc F. Hoylaerts,6 Benoit Nemery,1 and Peter H.M. Hoet1

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Inflammatory properties, tissue distribution and prothrombotic effects after intravenous injection measure to QDs with Carboxyl surface coating and QOs with amine surface coating using transmission electron microscopy and dynamic light scattering.

Particle characterization – Amine-QDs have more negative zeta potential ...

paper3

Cellular Toxicity of Carbon-Based Nanomaterials Arnaud Magrez,*,† Sandor Kasas,‡,§ Vale´rie Salicio,| Nathalie Pasquier,^ Jin Won Seo,† Marco Celio,| Stefan Catsicas,‡ Beat Schwaller,| and La´szlo´ Forro´ †

Effect of shape and surface chemical properties on the toxicity. Celatine, MUCNTs, CNFs, Carbon black are used and H596 cells are used for the experiment. Number of living cells and optical density was established though MTT assay. An accurate quantification of cell numbers could be known through them. For the shape toxicity, The ...

paper2

Drug Delivery with Carbon Nanotubes for In vivo Cancer Treatment Zhuang Liu,1 Kai Chen,2 Corrine Davis,3 Sarah Sherlock,1 Qizhen Cao,2 Xiaoyuan Chen,2 and Hongjie Dai

(Nano Safety) SWNT-PTX is more effective than clinical Taxol for treatment in a murine 4T1 breast cancer model. Longer blood circulation and EPR(enhanced permeability and retention) effects result to have higher tumor uptake of PTX. SWNT-PTX slow down the growth of tumor at a low drug dose and ...

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Carbon nanotubes as multifunctional biological transporters and near-infrared agents for selective cancer cell destruction - Nadine Wong Shi Kam*, Michael O’Connell*, Jeffrey A. Wisdom†, and Hongjie Dai*‡

(Nano Safety) NIR radiation and optical property of SWNT can cause cancer cell death without destroying normal cell. Functionalization of SWNT by PEG ligands could recognize and targets timorous cell types. Combining these two factor can open for drug delivery and cancer therapy.