Table 2.

Substances other than TMA⁺: Diffusion measured with RTI or RTP method

Molecule	Mr	D × 106	Technique	Species	Region	Prep.	°C	λ	α	Refs.
		cm2 s−1
TMA+,a	74	11.1	RTI-ISM	rat	cereb. mlb	in vivo	37	1.49	0.18	257
TEA+	130	7.90	RTI-ISM	rat	cereb. mlb	in vivo	37	1.48	0.21	257
AsF6−	189	14.0	RTI-ISM	rat	cereb. mlb	in vivo	37	1.68	0.26	257
α-NS−	174	7.60	RTI-ISM	rat	cereb. mlb	in vivo	37	1.54	0.18	257
Ca2+	40	9.90c	RTP-ISM	rat	cortex	in vivo	35	1.82d	n/a	261
Dopamine	153	6.90	RTP-CFM	gp	SNc	slice	32	1.68	n/a	71
Dopamine	153	6.90	RTP-CFM	gp	SNr	slice	32	1.80	n/a	71
Dopamine	153	6.90	RTP-CFM	gp	VTA	slice	32	1.72	n/a	71
Penicillin	356	3.52	RTP-ISM	rat	cortex	in vivo	37	1.62	n/a	191
PTZ	138	8.50	RTP-ISM	rat	cortex	in vivo	37	1.63	n/a	336
T-valproate	142	5.25	RTP-ISM	rat	cortex	in vivo	37	1.67	n/a	209
Valproate	144	6.25	RTP-ISM	rat	cortex	in vivo	37	1.92	n/a	209
Verapamil	455	5.08	RTP-ISM	rat	cortex	in vivo	37	1.51	n/a	171

Footnotes

Penicillin = Na-penicillin-G

PTZ = Pentylenetetrazol

T-valproate = Trans-2-en-valproate

ISM = Ion-selective microelectrode

CFM = Carbon-fiber microelctrode

gp = Guinea Pig

cereb. ml = Cerebellum, molecular layer

SNc = Substantia nigra, pars compacta

SNr = Substantia nigra, pars reticulate

VTA = Ventral tegmental area

^aThis TMA⁺ result included for comparison. Main TMA⁺ results in Tables 4A, 4B – 7

^banisotropy not taken into account

^cD for Ca²⁺ based on unpublished experiments and analysis by Hrabětová, Masri, Tao and Nicholson

^dbased on D* = 3.0 × 10⁻⁶ cm² s⁻¹, Ref (261)

n/a = not available