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Insight into the Unwrapping of the Dinucleosome

Soft Matter, 2020, Accepted Manuscript
DOI: 10.1039/D0SM00161A, Paper
Fatemeh Khodabandeh, Hashem Fatemi, Farshid Mohammad-Rafiee
Dynamics of nucleosomes, the building blocks of the chromatin, has crucial effects on expression, replication and repair of genomes in eukaryotes. Beside constant movements of nucleosomes by thermal fluctuations, ATP-dependent...
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Marangoni puffs: dramatically enhanced dissolution of droplets with an entrapped bubble

Soft Matter, 2020, Advance Article
DOI: 10.1039/D0SM00093K, Paper
José M. Encarnación Escobar, Jaap Nieland, Arie van Houselt, Xuehua Zhang, Detlef Lohse
We present a curious effect observed during the dissolution process of water-immersed long-chain alcohol drops with an entrapped bubble. When the drop-water interface and the air bubble contact each other, a rapid cyclic motion that accelerates the drop's dissolution is found. We name this eye-catching phenomenon puffing.
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Structural universality in disordered packings with size and shape polydispersity

Soft Matter, 2020, Advance Article
DOI: 10.1039/D0SM00110D, Paper
Ye Yuan, Wei Deng, Shuixiang Li
Normalized free volume collapses on normalized particle size in polydisperse-sized packings for a given non-spherical particle.
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Different-shaped micro-objects driven by active particle aggregations

Soft Matter, 2020, Advance Article
DOI: 10.1039/D0SM00160K, Paper
Chen Wang, Hongyuan Jiang
We study the dynamics of passive micro-objects in the active bath. The motion of micro-objects depends on the pattern of active particle aggregations.
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Mix and match—a versatile equilibrium approach for hybrid colloidal synthesis

Soft Matter, 2020, Advance Article
DOI: 10.1039/D0SM00202J, Communication
Matan Yah Ben Zion, Yaelin Caba, Ruojie Sha, Nadrian C. Seeman, Paul M. Chaikin
We outline a simple yet general equilibrium technique for a scalable, high-purity, hybrid-colloidal synthesis with controlled valency. The method is applicable for liquid and solid particles and to a range of particle interactions.
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Effect of polar amino acid incorporation on Fmoc-diphenylalanine-based tetrapeptides

Soft Matter, 2020, Accepted Manuscript
DOI: 10.1039/D0SM00320D, Paper
Alexandra Daryl Ariawan, Biyun Sun, Jonathan Pawel Wojciechowski, Ian Lin, Eric Y Du, Sophia C Goodchild, Charles Gordon Cranfield, Lars M Ittner, Pall Thordarson, Adam David Martin
Peptide hydrogels show great promise as extracellular matrix mimics due to their tuneable, fibrous nature. Through incorporation of polar cationic, polar anionic or polar neutral amino acids into the Fmoc-diphenylalanine...
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Self-assembly of isomeric naphthalene appended glucono derivatives: nanofibers and nanotwists with circularly polarized luminescence emission

Soft Matter, 2020, 16,4115-4120
DOI: 10.1039/C9SM02542A, Paper
Zongwen Liu, Yuqian Jiang, Jian Jiang, Donghua Zhai, Decai Wang, Minghua Liu
Two isomers of naphthalene derivatives are self-assembled into nanofibers and nanotwists with CPL emission, respectively.
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Controlled shape morphing of solvent free thermoresponsive soft actuators

Soft Matter, 2020, 16,4162-4172
DOI: 10.1039/D0SM00020E, Paper
Vadakkumnalath Prakasan Anju, Raghunandan Pratoori, Deepak Kumar Gupta, Rajendra Joshi, Ratna Kumar Annabattula, Pijush Ghosh
Reconfigurable actuators are designed based on chitosan and pNipam which has the capability to attain precise and programmable actuation. The current approach offers a feasible way to fabricate soft actuators with repeatable and reversible actuation.
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Characterizing the fluid–matrix affinity in an organogel from the growth dynamics of oil stains on blotting paper

Soft Matter, 2020, 16,4200-4209
DOI: 10.1039/C9SM01965K, Paper
Open Access
Qierui Zhang, Frieder Mugele, Piet M. Lugt, Dirk van den Ende
Fluid–matrix affinity in an organogel is characterized by capillarity-induced oil release using absorbing paper.
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Rapid analysis of cell-generated forces within a multicellular aggregate using microsphere-based traction force microscopy

Soft Matter, 2020, 16,4192-4199
DOI: 10.1039/C9SM02377A, Paper
Buğra Kaytanlı, Aimal H. Khankhel, Noy Cohen, Megan T. Valentine
We measure cell-generated forces from the deformations of elastic microspheres embedded within multicellular aggregates. Using a computationally efficient analytical model, we directly obtain the full 3D mapping of surface stresses within minutes.
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Rapid characterization of neutral polymer brush with a conventional zetameter and a variable pinch of salt

Soft Matter, 2020, 16,4274-4282
DOI: 10.1039/C9SM01850F, Paper
Mena Youssef, Alexandre Morin, Antoine Aubret, Stefano Sacanna, Jérémie Palacci
We take advantage of the nanoscopic nature of the Debye length and used it as a probe to characterize polymer brushes on colloidal particles.
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Systematic approach for wettability prediction using molecular dynamics simulations

Soft Matter, 2020, 16,4299-4310
DOI: 10.1039/D0SM00197J, Paper
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Ahmed Jarray, Herman Wijshoff, Jurriaan A. Luiken, Wouter K. den Otter
An efficient approach for fast screening of liquids in terms of their wetting properties.
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Active noise experienced by a passive particle trapped in an active bath

Soft Matter, 2020, Advance Article
DOI: 10.1039/D0SM00006J, Paper
Simin Ye, Peng Liu, Fangfu Ye, Ke Chen, Mingcheng Yang
We study the properties of active noise experienced by a passive particle harmonically trapped in an active bath. The active noise is shown to depend on the trap stiffness.
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Controlled release of entrapped nanoparticles from thermoresponsive hydrogels with tunable network characteristics

Soft Matter, 2020, Advance Article
DOI: 10.1039/D0SM00207K, Paper
Yi Wang, Zhen Li, Jie Ouyang, George Em Karniadakis
Thermoresponsive hydrogels have been studied intensively for creating smart drug carriers and controlled drug delivery.
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Wall entrapment of peritrichous bacteria: A mesoscale hydrodynamics simulation study

Soft Matter, 2020, Accepted Manuscript
DOI: 10.1039/D0SM00571A, Paper
S. Mahdiyeh Mousavi, Gerhard Gompper, Roland G. Winkler
Microswimmers such as E. Coli bacteria accumulate and exhibit an intriguing dynamics near walls, governed by hydrodynamic and steric interactions. Insight into the underlying mechanisms and predominant interactions demand a...
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A Companion to Photography


 

The study of photography has never been more important. A look at today's digital world reveals that a greater number of photographs are being taken each day than at any other moment in history. Countless photographs are disseminated instantly online and more and more photographic images are earning prominent positions—and garnering record prices—in the rarefied realm of top art galleries.

Reflecting this dramatic increase in all things photographic



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The Landscapists


 

Who defines the landscapes around us? What practices are employed as contemporary landscapes are produced? This issue argues that landscapes are made and remade through interrelations between people and the worlds around them – from geographers investigating the lives of urban wastelands to landscape architects projecting future cities, and from migrants navigating border systems to artists working with local residents. In contrast to tendencies to



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How do you accelerate your hybrid applications?


When apps are from Mars and infrastructure is from Venus, how do you accelerate your Hybrid Applications?
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Tapping expertise — how T.N. is handling the crisis

Multiple panels with senior bureaucrats constituted to address issues arising out of the pandemic




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[ASAP] Plasmon-Mediated Coherent Superposition of Discrete Excitons under Strong Exciton–Plasmon Coupling in Few-Layer MoS<sub>2</sub> at Room Temperature

ACS Photonics
DOI: 10.1021/acsphotonics.0c00233




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ACS Photonics
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[ASAP] Size, Ligand, and Defect-Dependent Electron–Phonon Coupling in Chalcogenide and Perovskite Nanocrystals and Its Impact on Luminescence Line Widths

ACS Photonics
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[ASAP] Development of Lipid-Coated Semiconductor Nanosensors for Recording of Membrane Potential in Neurons

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ACS Photonics
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Iconography of Security

Molly Wilson and Eileen Wagner battle the age old Christmas issues of right and wrong, good and evil, and how the messages we send through iconography design can impact the decisions users make around important issues of security. Are you icons wise men, or are they actually King Herod?


Congratulations, you’re locked out! The paradox of security visuals

Designers of technology are fortunate to have an established visual language at our fingertips. We try to use colors and symbols in a way that is consistent with people’s existing expectations. When a non-designer asks a designer to “make it intuitive,” what they’re really asking is, “please use elements people already know, even if the concept is new.”

Lots of options for security icons

We’re starting to see more consistency in the symbols that tech uses for privacy and security features, many of them built into robust, standardized icon sets and UI kits. To name a few: we collaborated with Adobe in 2018 to create the Vault UI Kit, which includes UI elements for security, like touch ID login and sending a secure copy of a file. Adobe has also released a UI kit for cookie banners.

Activity log from the Vault Secure UI Kit, by Adobe and Simply Secure.
Cookie banner, from the Cookie Banner UI Kit, by Adobe.

Even UI kits that aren’t specialized in security and privacy include icons that can be used to communicate security concepts, like InVision’s Smart Home UI Kit. And, of course, nearly every icon set has security-related symbols, from Material Design to Iconic.

Key, lock, unlock, shield, and warning icons from Iconic.
A selection of security-related icons from Material Design.
Security shields from a selection of Chinese apps, 2014. From a longer essay by Dan Grover.

Many of these icons allude to physical analogies for the states and actions we’re trying to communicate. Locks and keys; shields for protection; warning signs and stop signs; happy faces and sad faces. Using these analogies helps build a bridge from the familiar, concrete world of door locks and keyrings to the unfamiliar, abstract realm of public- and private-key encryption.

flickr/Jim Pennucci
GPG Keychain, an open-source application for managing encryption keys. Image: tutsplus.com

When concepts don’t match up

Many of the concepts we’re working with are pairs of opposites. Locked or unlocked. Private or public. Trusted or untrusted. Blocked or allowed. Encouraged or discouraged. Good or evil. When those concept pairs appear simultaneously, however, we quickly run into UX problems.

Take the following example. Security is good, right? When something is locked, that means you’re being responsible and careful, and nobody else can access it. It’s protected. That’s cause for celebration. Being locked and protected is a good state.

“Congratulations, you’re locked out!”

Whoops.

If the user didn’t mean to lock something, or if the locked state is going to cause them any inconvenience, then extra security is definitely not good news.

Another case in point: Trust is good, right? Something trusted is welcome in people’s lives. It’s allowed to enter, not blocked, and it’s there because people wanted it there. So trusting and allowing something is good.

“Good job, you’ve downloaded malware!”

Nope. Doesn’t work at all. What if we try the opposite colors and iconography?

That’s even worse. Even though we, the designers, were trying both times to keep the user from downloading malware, the user’s actual behavior makes our design completely nonsensical.

Researchers from Google and UC Berkeley identified this problem in a 2016 USENIX paper analyzing connection security indicators. They pointed out that, when somebody clicks through a warning to an “insecure” website, the browser will show a “neutral or positive indicator” in the URL bar – leading them to think that the website is now safe. Unlike our example above, this may not look like nonsense from the user point of view, but from a security standpoint, suddenly showing “safe/good” without any actual change in safety is a pretty dangerous move.

The deeper issue

Now, one could file these phenomena under “mismatching iconography,” but we think there is a deeper issue here that concerns security UI in particular. Security interface design pretty much always has at least a whiff of “right vs. wrong.” How did this moralizing creep into an ostensibly technical realm?

Well, we usually have a pretty good idea what we’d like people to do with regards to security. Generally speaking, we’d like them to be more cautious than they are (at least, so long as we’re not trying to sneak around behind their backs with confusing consent forms and extracurricular data use). Our well-intentioned educational enthusiasm leads us to use little design nudges that foster better security practices, and that makes us reach into the realm of social and psychological signals. But these nudges can easily backfire and turn into total nonsense.

Another example: NoScript

“No UX designer would be dense enough to make these mistakes,” you might be thinking.

Well, we recently did a redesign of the open-source content-blocking browser extension NoScript, and we can tell you from experience: finding the right visual language for pairs of opposites was a struggle.

NoScript is a browser extension that helps you block potential malware from the websites you’re visiting. It needs to communicate a lot of states and actions to users. A single script can be blocked or allowed. A source of scripts can be trusted or untrusted. NoScript is a tool for the truly paranoid, so in general, wants to encourage blocking and not trusting. But:

“An icon with a crossed-out item is usually BAD, and a sign without anything is usually GOOD. But of course, here blocking something is actually GOOD, while blocking nothing is actually BAD. So whichever indicators NoScript chooses, they should either aim to indicate system state [allow/block] or recommendation [good/bad], but not both. And in any case, NoScript should probably stay away from standard colors and icons.”

So we ended up using hardly any of the many common security icons available. No shields, no alert! signs, no locked locks, no unlocked locks. And we completely avoided the red/green palette to keep from taking on unintended meaning.

Navigating the paradox

Security recommendations appear in most digital services are built nowadays. As we move into 2020, we expect to see a lot more conscious choice around colors, icons, and words related to security. For a start, Firefox already made a step in the right direction by streamlining indicators for SSL encryption as well as content blocking. (Spoilers: they avoided adding multiple dimensions of indicators, too!)

The most important thing to keep in mind, as you’re choosing language around security and privacy features, is: don’t conflate social and technical concepts. Trusting your partner is good. Trusting a website? Well, could be good, could be bad. Locking your bike? Good idea. Locking a file? That depends.

Think about the technical facts you’re trying to communicate. Then, and only then, consider if there’s also a behavioral nudge you want to send, and if you are, try to poke holes in your reasoning. Is there ever a case where your nudge could be dangerous? Colors, icons, and words give you a lot of control over how exactly people experience security and privacy features. Using them in a clear and consistent way will help people understand their choices and make more conscious decisions around security.


About the author

Molly Wilson is a designer by training and a teacher at heart: her passion is leveraging human-centered design to help make technology clear and understandable. She has been designing and leading programs in design thinking and innovation processes since 2010, first at the Stanford d.school in Palo Alto, CA and later at the Hasso-Plattner-Institut School of Design Thinking in Potsdam, Germany. Her work as an interaction designer has focused on complex products in finance, health, and education. Outside of work, talk to her about cross-cultural communication, feminism, DIY projects, and visual note-taking.

Molly holds a master’s degree in Learning, Design, and Technology from Stanford University, and a bachelor’s degree magna cum laude in History of Science from Harvard University. See more about her work and projects at http://molly.is.

Eileen Wagner is Simply Secure’s in-house logician. She advises teams and organizations on UX design, supports research and user testing, and produces open resources for the community. Her focus is on information architecture, content strategy, and interaction design. Sometimes she puts on her admin hat and makes sure her team has the required infrastructure to excel.

She previously campaigned for open data and civic tech at the Open Knowledge Foundation Germany. There she helped establish the first public funding program for open source projects in Germany, the Prototype Fund. Her background is in analytic philosophy (BA Cambridge) and mathematical logic (MSc Amsterdam), and she won’t stop talking about barbershop music.

More articles by Molly Wilson & Eileen