Does thermal inversion occur in the winter or in the summer?

309

Why we are using propyl parabben in methanol in calibration of hplc for GPV test??

2363

Besides the extent of branching, can you think of any other structural parameters that might lead to differences in physical properties? : Polymer Chemistry

1313

what is the procedure for cleaning of lenses of hatr accesory of ftir instrument?

2303

why do hard water never produce foam when a soap is dissolved?

1054

How would you describe the orientation of the ligands around the zr center in the homogeneous zirconium catalyst? : Polymer Chemistry

1019

What is an interrupt?

2049

Which amount of DMEM and Glutamine should be commaneded ?

2190

Define association rules?

1

what is silicon chip

2116

Which of the following is prevented best with vaccination?

2347

What is the importance of Rhodococcus sp ?

2404

What are modes of quantification in related substances

2181

What are the three types of germ layers that form tissues and organs in animals?

5

In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?

1986