Clark College Tutoring and Writing Center tutor Joey Smokey explains molecular shapes, introducing the concepts of electron geometry and molecular geometry. Joey provides images and descriptions of the five main molecular shapes: tetrahedral, trigonal planar, linear, bent, and trigonal pyramidal.
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Aarkstore Enterprise – China Molecular Diagnostic
Aarkstore announce a new report “China Molecular Diagnostic ” through its vast collection of market research report.
China Molecular diagnostics in a high growth, high profit, high investment area in China. Industry players, investors, buyers, and vendors will benefit from this essential database. This database includes more than 100 companies providing molecular diagnostic products and services in China. More than 50 Chinese domestic and multinational kit & instrument manufacturers are included. The database also includes key distributors and service providers.
Method of information collection: secondary research targeting company domain, public domain and government resources was conducted. This was followed by a primary phase including contact of more than 60% of companies in the database, and discussions with industry insiders.
This report comes along with database of China Molecular Diagnostic
China Molecular Diagnostic database includes more than 100 companies providing molecular diagnostic products and services in China. More than 50 Chinese domestic and multinational kit & instrument manufacturers are included. The database also includes key distributors and service providers. The database is searchable entries include :
I. Company name in English
II. Company name in Chinese
III. Address, phone number, and fax number
VI. Website and e-mail
V. Company products with SFDA licenses
VI. Additional key products
VII. Relevant awards and certificates such as China GMP, ISO
VIII. Ownership structure
IX. Main products and services
X. Founding year (90%)
XI. Company introduction (60%)
I. Background
History
Applications
Government & Policies
Marketing
II. History of China molecular diagnostics
Nucleic acid hybridization
Polymerase chain reaction
Quantitative nucleic acid analysis
Biochip technologies
Entry of multinational companies
III. PCR technologies
PCR diagnostic reagent kits
PCR instruments
IV. Biochips
V. Other molecular diagnostics
VI. Key molecular markets & indicators
VII. Government & Policy environment
Relevant government departments
Administration of molecular diagnostics
Quality management for clinical laboratories
VIII. Markets
IX. Profiles
Da An Co. Ltd. Of Sun Yat-Sen University
Shenzhen Yishengtang Biological Products Co. Ltd.
United Gene Holdings
Shenzhen PG Biotech Co Ltd.
X. Appendix
For more information, please visit:
http://www.aarkstore.com/reports/China-Molecular-Diagnostic-2010.html
Or email us at press@aarkstore.com or call +919272852585
Introduction to molecular and empirical formulas. Calculating molecular mass.
Molecular Weight and Molecular Size by GPC-SEC
Who wants to measure molecular weights and sizes?
The answer is a surprisingly broad range of people and companies. Molecular weight and size is most often used in identification of proteins, and in characterization of polymers.
Molecular Weight is commonly measured in industries such as::
* Pharmaceutical industry
* Biotech research
* Medical analysis
* The food industry
* Petroleum and polymer industries
Radius of gyration and Hydrodynamic radius
Molecules are not simple shapes – unlike the fairly compliant, mathematically-uncomplicated atom, which is spherical, molecules are difficult to define as a simple shape. Hence two measurements have become industry standards, and analytical instruments are geared towards obtaining these; the radius of gyration, and the hydrodynamic radius.
Radius of gyration
Scientific instruments can be used to identify the center of mass and dimensions of a molecule; this is its radius of gyration.
It is measured directly using static light scattering; however this method has limitations at sizes lower than 10-15nm, and also for large molecules like polysaccharides. Viscometers are the tool which is most often used for determining radius of gyration, using the Flory-Fox equation.
Hydrodynamic radius
This is a behavioral property of a substance – a measurement of size based on how it moves, which means that it is much more useful in industrial or practical settings.
Size exclusion chromatography
Size exclusion chromatography is the method by which scientists determine the molecular size (not the weight!), of a particular substance. Molecules are separated in columns packed with porous substances, which might include glass beads, polystyrene gels, silica gel, etc.
Larger molecules elute more quickly through the columns, since the molecules cannot fit into as many spaces. A concentration detector is placed at the bottom of the GPC columns to determine the amount of material of each size fraction. In traditional SEC/GPC systems, operators need to pass known standards through the columns before the sample. By creating a calibration curve of size versus elution time, particle size of unknown samples can be calculated.
In more recent times, addition of other detection techniques such as Static Light Scattering and the Intrinsic Viscosity detector provide direct measurement of molecular weight and size so that traditional calibration techniques are not required.
Gel permeation chromatography
SEC is also commonly referred to by other names. When an aqueous solution is used to carry the sample through the column, the technique is often called “Gel Filtration Chromatography”, and the name “Gel Permeation Chromatography” is often used when solvents are used to carry the substance in question through the packed columns.
molecular biology courses
For those who want to pursue their doctorate on molecular biology but are too busy with their work or other occupation, there is now a convenient alternative. You can now employ the internet as a tool to accomplish your academic goals.More often than not, earning your doctorate degree online usually lasts for up to three years, sometimes less depending on the programs offered by the school. All of the students of the university are welcome to listen to the lecture. However, tutorials for the Molecular Biology PhD are only limited to those who are enrolled to the program.Among the conveniences you stand to enjoy by taking online college courses is that you won’t need to budge from your room to attend classes. You can select a schedule that will not conflict with your other duties during the day. You can choose the pace at which you learn.
Those people who do not have any extra time to go to school or those who don’t live near one are the ones who could really benefit from this type of option.
Various kinds of people try these online courses. Aside from people who don’t have time to go to and from school, there are also a lot of international students who take advantage of this.Biology, chemistry, and mathematics subjects must be passed during high school as well. If you are qualified enough you can proceed to apply to your preferred biology subject, after which an online examination is required. Rather than attending on-campus classes, you will be taking the course through the internet.
First, the student microscopes are the cheapest and smallest although it must be emphasized that their capabilities for advanced techniques and documentation are excellent value for your money. If you have a student in your home that has interest in the biological processes, then it is a great investment towards enhancing said interest.Biological processes of course are consequences of physics and chemistry, which is why we require biology students to study the physical sciences. But organisms are also historical entities molded by their environment both physical and social, and that’s where the complexities arise.
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