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the-science-llama: Fluorescein This chemical is...

beningtirta — Thu, 13 Jun 2013 16:21:55 +0800

Fluorescein // HouseholdHacker // posted by The-Science-Llama

Fluorescein // HouseholdHacker // posted by The-Science-Llama

Fluorescein // HouseholdHacker // posted by The-Science-Llama

the-science-llama:

Fluorescein

This chemical is a fluorophore, containing many aromatic groups and having the ability to absorb light and re-emit a new photon (fluorescence). There are other types of fluorescence that allow re-emission of light at higher energies or even the same energy but in this case the re-emitted light is at a lower energy. Because it is under a UV light, it absorbs the UV and the light that it re-emits will be visible to human eyes. Sadly, what we can see is only a very narrow band of the spectrum, still pretty awesome!

The dye I used for my Honours project :’)

"The planet’s immunological system will respond and eliminate humans by not sustaining them in..."

beningtirta — Sun, 07 Apr 2013 12:31:28 +0800

“The planet’s immunological system will respond and eliminate humans by not sustaining them in the dramatically altered environment that they created.”

- Kurt Vonnegut

The Twelve Principles of Green Chemistry

beningtirta — Fri, 15 Mar 2013 11:05:50 +0800

Prevention
It is better to prevent waste than to treat or clean up waste after it has been created.
Atom Economy
Synthetic methods should be designed to maximize the incorporation of all materials used in the process into the final product.
Less Hazardous Chemical Syntheses
Wherever practicable, synthetic methods should be designed to use and generate substances that possess little or no toxicity to human health and the environment.
Designing Safer Chemicals
Chemical products should be designed to affect their desired function while minimizing their toxicity.
Safer Solvents and Auxiliaries
The use of auxiliary substances (e.g., solvents, separation agents, etc.) should be made unnecessary wherever possible and innocuous when used.
Design for Energy Efficiency
Energy requirements of chemical processes should be recognized for their environmental and economic impacts and should be minimized. If possible, synthetic methods should be conducted at ambient temperature and pressure.
Use of Renewable Feedstocks
A raw material or feedstock should be renewable rather than depleting whenever technically and economically practicable.
Reduce Derivatives
Unnecessary derivatization (use of blocking groups, protection/ deprotection, temporary modification of physical/chemical processes) should be minimized or avoided if possible, because such steps require additional reagents and can generate waste.
Catalysis
Catalytic reagents (as selective as possible) are superior to stoichiometric reagents.
Design for Degradation
Chemical products should be designed so that at the end of their function they break down into innocuous degradation products and do not persist in the environment.
Real-time analysis for Pollution Prevention
Analytical methodologies need to be further developed to allow for real-time, in-process monitoring and control prior to the formation of hazardous substances.
Inherently Safer Chemistry for Accident Prevention
Substances and the form of a substance used in a chemical process should be chosen to minimize the potential for chemical accidents, including releases, explosions, and fires.

Genius is…

beningtirta — Wed, 13 Mar 2013 08:39:09 +0800

Genius is…

Angew's 125th Anniversary Free Online Symposium is going on

beningtirta — Tue, 12 Mar 2013 23:47:07 +0800

Angew's 125th Anniversary Free Online Symposium is going on:

I was so glad to watch speeches from both Professor Susumu Kitagawa and Professor Ahmed Zewail

A chemistry blog by a supersmart post-doc

beningtirta — Tue, 12 Mar 2013 22:25:48 +0800

A chemistry blog by a supersmart post-doc

Wiley's recent hottest articles in catalysis for FREE!

beningtirta — Wed, 06 Mar 2013 19:22:54 +0800

Wiley's recent hottest articles in catalysis for FREE!:

Here are some samples:

1. Nano-photocatalytic Materials: Possibilities and Challenges

2. On Being Green: Can Flow Chemistry Help?

3. Nano-photocatalytic Materials: Possibilities and Challenges

Fundamental requirements of effective research

beningtirta — Tue, 26 Feb 2013 09:37:56 +0800

1. Clarity of presentation

2. Reproducibility of data

3. Testing of assumptions

4. Search for additional variables

5. Acknowledgement of both ideas and data used in the work buy generated by others

"The quest for knowledge of the unknown is what science is all about"

beningtirta — Tue, 26 Feb 2013 09:36:47 +0800

“The quest for knowledge of the unknown is what science is all about”

- Ahmed Zewail (via beningtirta)

"The fine art of interpreting data is to say no more but also no less than the data allow for."

beningtirta — Tue, 26 Feb 2013 09:28:39 +0800

“The fine art of interpreting data is to say no more but also no less than the data allow for.”

- W. F. van Gunsteren, et al. (2008)

7 Deadly Sins in Academic Behavior (in the Natural Sciences)

beningtirta — Tue, 26 Feb 2013 09:26:38 +0800

1. A poor or incomplete description of the work, for example, publishing pretty pictures instead of evidence of causality.

2. Failure to perform obvious, cheap tests that could confirm or repudiate a model, theory, or measurement, for example, to detect additional variables or to show under which conditions a model or theory breaks down.

3. Insufficient connection between data and hypothesis or message, leading to lack of support for the message or over-interpretation of data, for example, rendering the story more sensational or attractive.

4. The reporting of only favorable results, for example, reporting positive or desired (hoped for) results while omitting those that are negative.

5. Neglect of errors found after publication.

6. Plagiarism

7. The direct fabrication or falsification of data.

Just call it next milestone. Yosh!

beningtirta — Sun, 13 Jan 2013 01:37:15 +0800

Just call it next milestone. Yosh!

#retrosynthesis

beningtirta — Sun, 13 Jan 2013 00:09:00 +0800

*read from bottom to top*

If you won’t even remember the rest of this “kultwit”, just remind urself to think backward, from the future to the present. #retrosynthesis
Break down the future you want into achievable “intermediates” and note down the conditions to be fulfilled. #retrosynthesis
If you are stuck in planning future, do it reversely. Determine what you want and aspire to, and how you want to see future.#retrosynthesis
Some of us are unsure what to choose and what to do next in the future, in years from now. Future is rather fussy, yes? #retrosynthesis
Now, anyone can bring the analogy into real actions in life?#retrosynthesis
I think I talk to much and a little off because of jargon people may not be familiar with. I hope you get my point :D #retrosynthesis
They can slaughter a huge, complicated oxytocin http://upload.wikimedia.org/wikipedia/commons/5/55/Oxytocin_with_labels.png … into purchasable chemicals than make it. Simple rite? #retrosynthesis
These days scientist do use #retrosynthesis to generate pathways to synthesize a similar chemical to profitable natural products.
Oops, benzene may be a bad choice :D How about 1,2,4-trimethylbenzene? #retrosynthesis
Suppose you want to synthesize vitamin E http://upload.wikimedia.org/wikipedia/commons/a/ad/Tocopherol%2C_alpha-.svg …, think how many ways you can take to get there from benzene. #retrosynthesis
Ordinary synthesis is about to think forward step by step and this way may give you various options you may get confused. #retrosynthesis
Now shall we compare #retrosynthesis and ordinary synthesis mindset?
By doing so, you then can estimate if your designed pathway is feasible and how much effort you need to achieve it. #retrosynthesis
After some steps breaking down, you must end up with some known reactions to achieve the intermediates & conditions needed.#retrosynthesis
#retrosynthesis is about to know (the chemical) you want, then you break it down into simpler ingredients with known steps forward.
In chemistry we learn #retrosynthesis, it is an ordinary synthetic pathway in practice but the way the scientists get there is reversely.

"I know you all can make your own masterpieces in your life, my girls and boys! Just do your own..."

beningtirta — Sat, 12 Jan 2013 05:24:26 +0800

“I know you all can make your own masterpieces in your life, my girls and boys! Just do your own ‘synthesis’ pathways, break any ‘inhibitors’ that would render your spirit to achieve your dreams and generate your own ‘catalysts’ to get through your ‘activation energy’ in seeking your happiness and success in life!”

- Deana Wahyuningrum

The faster you move the heavier you get? (via muhammadakhyar)

beningtirta — Fri, 04 Jan 2013 08:52:38 +0800

The faster you move the heavier you get? (via muhammadakhyar)

This, Father of Chemistry.

beningtirta — Sun, 09 Dec 2012 10:08:38 +0800

This, Father of Chemistry.

"These days, instruments are so user-friendly so even monkeys can operate."

beningtirta — Thu, 22 Nov 2012 10:52:10 +0800

“These days, instruments are so user-friendly so even monkeys can operate.”

- A retired crystallographer

CNT stands for carbon nanotube :’)

beningtirta — Wed, 22 Aug 2012 10:41:37 +0800

CNT stands for carbon nanotube :’)

Don't be fooled and stay calm, people!

beningtirta — Mon, 06 Aug 2012 11:17:15 +0800

“There is still time to act and avoid a worsening climate, but we are wasting precious time. We can solve the challenge of climate change with a gradually rising fee on carbon collected from fossil-fuel companies, with 100 percent of the money rebated to all legal residents on a per capita basis. This would stimulate innovations and create a robust clean-energy economy with millions of new jobs. It is a simple, honest and effective solution.

The future is now. And it is hot.”

Source: The Washington Post

Note on #2ndphotosynthesisworkshop

beningtirta — Fri, 29 Jun 2012 16:44:00 +0800

I have been recalling about what were being discussed during the photosynthesis workshop. The workshop was a very fruitful one which comprised a large span of knowledge from various points of view, from biology to photonics. They (the speakers) brought forwards the findings from what they (and their supersmart PhD students of course) have been working on. Some talked about the ‘miracles’ they found biosystems, while others preached on the importance of the use of metal nanoparticles in harvesting solar energy.

For your information, the workshop was mainly initiated by the abundance of unused solar energy that have been showered on this Earth by the mighty Sun without getting bored. It was said that if we were able to harvest the energy of sunlight showered upon the Earth’s surface for an hour, we would be able to provide electricity needed by the Earth dwellers for one year.