Discover Lifes page about the biology, natural history, ecology, identification and distribution of Guatteria dumetorum immature-fruit cluster image

Figure 1. Aporphine and tetrahydroprotoberberine alkaloids isolated from the leaves of Guatteria friesiana (Annonaceae).. Experimental. General. UV spectra were obtained in CH3OH on an Agilent HP 8453 UV-Vis spectrophotometer. IR spectra were acquired in KBr pellets on a BIORAD FTS-3500 GX spectrophotometer. Optical rotations were measured in CHCl3 or MeOH solutions at room temperature on a Rudolph Research Autopol III automatic polarimeter. Circular dichroism analyses were measured in MeOH on a JASCO J-720 spectropolarimeter. 1D and 2D NMR experiments were acquired in CDCl3, CDCl3 + drops of CD3OD, or CD3OD at 293 K on a Bruker AVANCE 400 NMR spectrometer operating at 9.4 T, observing 1H and 13C at 400 and 100 MHz, respectively. The spectrometer was equipped with a 5 mm multinuclear direct detection probe with z-gradient. One-bond (HSQC) and long-range (HMBC) 1H-13C NMR correlation experiments were optimized for average coupling constants 1J(C,H) and LRJ(C,H) of 140 and 8 Hz, respectively. All ...

In December 2007, I began dressing again for the first time in about 30 years. Follow my adventures and my fantasy of being a male lesbian in my blog entries ...

Middle nasal meatus aka Meatus nasi medius in the latin terminology and part of bones, cartilages and mucosa with focus on the lateral wall. Learn more now!