2-Ethyl-5-triphenyl-methyl-1,3-dioxane.

In the title compound, C(25)H(26)O(2), the dioxane ring adopts a chair conformation with the two substituent groups occupying equatorial positions.

(S)-Perillaldehyde azine.

The C=N-N=C linkage [torsion angle -172.5 (2)°] in the title azine, C(20)H(28)N(2), adopts a trans conformation. The six-membered rings adopt sofa conformations.

3,9-Bis(2-chloro-phen-yl)-2,4,8,10-tetra-oxaspiro-[5.5]undeca-ne.

The complete mol-ecule of the title compound, C(19)H(18)Cl(2)O(4), is generated by a crystallographic twofold axis that passes through the spiro C atom. The 1,3-dioxane ring adopts a chair conformation and the phenyl substituent occupies an equatorial site.

A new genetic factor for root gravitropism in rice (Oryza sativa L.).

Root gravitropism is one of the important factors to determine root architecture. To understand the mechanism underlying root gravitropism, we isolated a rice (Xiushui63) mutant defective in root gravitropism, designated as gls1. Vertical sections of root caps revealed that gls1 mutant displayed normal distribution of amyloplast in the columella cells compared with the wild type.

7,11,18,21-Tetra-oxatrispiro-[5.2.2.5.2.2]heneicosa-ne.

The four six-membered rings all adopt chair conformations in the two independent mol-ecules of the title cyclo-hexa-none cyclic diacetal with penta-erythritol, C(17)H(28)O(4).