We would like to congratulate recent graduates in chemistry and related fields for completing their doctorate study successfully. New Nepalese PhD chemists are as follows.
Dr. Lekh Nath Sharma: Dr. Sharma completed his PhD from Baylor University, TX, USA. He is currently a post-doc researcher at University of Georgia.
Dr. Rumi Chand: Dr. Chand did her doctorate study at Saga University, Japan.
Dr. Hom Nath Luitel: Dr. Luitel did his doctorate study at Saga University, Japan.
Dr. Santosh Gurung: Dr. Gurung finished his PhD from KangWon National University, South Korea.
Dr.Dambar Hamal: From Kansas State University, KS, USA
Dr.Tej B. Shrestha: From Kansas State University, KS, USA
I use this dye to check electroosmotic flow (EOF) in microfluidic channels. EOF has to be suppressed in the channels for many microfluidic experiments. Because of the charge developed on the surface of microfluidics channels buffer solution also moves when a voltage is applied. It moves from positive to negative electrode in glass microfluidic channel. RdB helps to monitor the EOF in the channel. Dye is injected into the positive electrode reservoir. Because it is a neutral dye any dye detected in the negative electrode side is due to EOF.
Rhodamine B, a neutral dye, is often used as a tracer to determine the rate and direction of flow and transport. This is fluorescent dye. It can thus be detected easily and inexpensively with instruments called fluorometers. Rhodamine dyes are used extensively in biotechnology applications such as fluorescence microscopy, flow cytometry, fluorescence correlation spectroscopy and ELISA.
Rhodamine B is used in biology as a staining fluorescent dye, sometimes in combination with auramine O, as the auramine-rhodamine stain to demonstrate acid-fast organisms, notably Mycobacterium.
Rhodamine B is tunable around 610 nm when used as a laser dye . Its luminescence quantum yield is 0.65 in basic ethanol, 0.49 in ethanol , and 0.68 in 94% ethanol.
The solubility in water is ~50 g/l. However, the solubility in acetic acid solution (30 vol.%) is ~400 g/l. Chlorinated tap water decomposes rhodamine B. Rhodamine B solutions adsorb to plastics and should be kept in glass.
Other uses: Rhodamine B is being tested for use as a biomarker in oral rabies vaccines for wildlife, such as raccoons, to identify animals that have eaten a vaccine bait. The rhodamine is incorporated into the animal's whiskers and teeth.
February 14th is Valentines day. No need to explain about this day to you. You may be planning to celebrate this day in your way!! To find your love and to have a long term relationship, there is one saying that you should have right chemistry or chemistry should match. For two people to fall in love the chemistry between them has to be just right.
“In chemistry different atoms and compounds combine together to form stable molecules and complexes, In the same way, if you get the right two people they will react together and make a very stable combination."
Do you believe in love at first sight? Or that the subtle scent a person gives off can attract or repel you? Or would you like to know why chocolate just makes everything better? Is romance all about chemistry
Some chemicals that come across love.
First, there's attraction. Nonverbal communication plays a big part in initial attraction and some of this communication may involve pheromones, a form of chemical communication.
The sweaty palms and pounding heart of infatuation are caused by higher than normal levels of norepinepherine.
Meanwhile, the 'high' of being in love is due to a rush of phenylethylamine and dopamine. Lasting love confers chemical benefits in the form of stabilized production of serotonin and oxytocin.
Suppression of vasopressin can cause males to abandon their love nest and seek new mates.
Interested in more Valentines day chemistry projects? Click here for chemistry.about.com
And, also watch this video. Prof talks series of random facts about chocolate and roses, and then gives some relationship advice at the end!
complimentary hotel stay for 5 nights of the meeting
a Young Scholar certificate
If you are
chemistry professional
working in developing countries that border the Pacific Ocean (e.g. from south Asia: Nepal, Bangladesh, Bhutan, Maldives, Sri Lanka)
under 40 years
in first permanent position in an educational institution, government agency, or other non profit organization as a professional chemist or related science discipline
then you are close to get young scholar award by American Chemical Society. For this you have to first submit abstract to Pacifichem 2010 conference and a separate application for the award and then finally have to attend the conference going to be held at Hawai on December 2010.
The closing date for receipt of applications is 1 April 2010.
The link given here has great videos that teach you some fundamental aspects of chemistry. It is free. This is World of Chemistry. It is specially appropriate for students taking high school or college chemistry. This resource was produced by University of Maryland and Educational Film Center. A video instructional series for college and high school classrooms and adult learners; 26 half-hour video programs and coordinated books.
Videos cover topics from introductory level to advanced levels. Topics also include physics and earth science components. Some of the topics are color, state of matter, the Atom, Periodic table, concepts of mole etc.This resource is also valuable for teachers seeking to review the subject matter. There are 26 videos on different topics related to chemistry.
We have one more Chemistry Doctorate in our community. Dr. Achyut Adhikari completed his PhD Degree form University of Karachi Pakistan in November 2009.
The title of his dissertation is “BIOPROSPECTING STUDIES ON SARCOCOCCA CORIACEA (HOOK. F.) OF NEPALESE ORIGIN”.
The summary of his dissertation is follows:
Although fluorine is the most abundant halogen in the Earth’s crust, fluorine containing natural products are extremely rare in nature. This is due to the special properties of fluorine such as: a) it is found in highly insoluble form, therefore it has less bioavailability, b) it has very high heat of hydration due to which it is a poor nucleophile in aqueous solution, and also c) redox potential which is required for the oxidation of fluoride is higher than that generated by the reduction of hydrogen peroxide, thus fluorine cannot be incorporated into organic compounds via the haloperoxidase reaction. Due to these reasons, the mechanism by which C-F bond formation can take place has attracted a considerable scientific interest. Only 18 organofluorine containing natural products have been reported so far. All of them are primary metabolites and no fluorine containing secondary metabolite has been reported from any natural source. This Ph. D. study has led to an exciting discovery of a novel class of fluoropyrimidine substituted alkaloids from a medicinal plant, Sarcococca coriacea of Nepalese origin.
Seven fluoropyrimidine containing steroidal alkaloids and one novel fluoropyrimidine substituted iononehave been obtained. This is the first time that fluorine containing secondary metabolites have been reported from any natural source, which has opened up a new avenue for further research in the chemistry of fluorine- containing secondary metabolites.
Additionally, nine known pregnane-type steroidal alkaloidshave also been isolated for the first time from S. coriacea, which include alkaloid-C, Na-ethylepipachysamine D, sarcovagenine C, sarcovagine D, N-methylpachysamine A , dictyophlebine, 5,6-dihydrosarconidine, terminaline, and iso-N-formylchonemorphine.
Congratulations to Dr. Adhikari on your great achievement and we all wish all the best for your bright future!!!!!!!!
