Jona periclitans ex lib. Jonae cap. 1. & 2

Invocatio: [hepreaa].

De silica ex solutione alkalina per barytam praecipitata

Arkit: 1 arkintunnukseton lehti, A-B4 C1.

De dominio eminente, ex dicto Matth. XXI. com. 2. minime probato

Dedicatio: Gabriel Serelius.

De confessione Evae, ex Gen. IV, 1

Invocatio: [Alpha et Omega].

Constituintes químicos de Hyptidendron canum (Pohl ex Benth.) R. Harley (Lamiaceae)

Chemical investigation of Hyptidendron canum stems resulted in the isolation of betulinic, ursolic and euscaphic acids. From the leaves were isolated 3β-O-β-galactopiranosilsitosterol, ursolic aldehyde, and mixtures of maslinic acid and 2α-hydroxyursolic acid, α and β-amyrin, uvaol and erythrodiol, sitosterol and stigmasterol, spathulenol and globulol. Hexane and chloroform leave fractions as well as ursolic and betulinic acids showed antifungal activities against the yeast form of Paracoccidioides brasiliensis.

Theoremata nonnulla ex diversis disciplinis desumpta

Painovuosi nimekkeestä.

An principia moralia ex consensu ac moribus gentium sint repetenda?

Invocatio: I.N.D.O.M.

De epistola Eliae ad Joramum, ex 2. Paral. XXI: 12. &c

Mennanderin gratulaatio painettu uudelleen: Das Inland (Dorpat) 1856 pg. 562-563

De silica ex solutione alkalina per calcem praecipitata

Dedicatio: Pierre Jean Bladh [ransk. pr.], Israël Holstius.

Fama regis ex Oriente venturi

Invocatio: I.N.J.

Determination of aluminum in food samples after preconcentration as aluminon complex on microcrystalline naphthalene by spectrophotometry

A sensitive preconcentration procedure for spectrophotometeric determination of aluminum was developed. Aluminum as aluminon complex is adsorbed on microcrystalline naphthalene. The naphthalene containing the complex is dissolved in 3 mL of acetone and its absorbance is measured at 544 nm. The effect of various factors on the preconcentration of aluminum was investigated. The calibration graph was linear in the range of 1-60 mg L-1. The limit of detection was 0.52 mg L-1 and relative standard deviation for the determination of 5 mg L-1 was 2.65%. The proposed solid phase extraction procedure was applied to determination of aluminum in food samples.

Commoda ex incrementis scientiarum religioni allata

Arkit: 1 arkintunnukseton lehti, A4 B3.

Pentas quaestionum quarundam, ex agro philosophiae decerptarum

Painovuosi nimekkeestä.

Fama regis ex Oriente venturi

Invocatio: I.N.J.

Determination of traces of nitrate in water samples using spectrophotometric method after its preconcentration on microcrystalline naphthalene

Nitrate is quantitatively retained with 2,6-bis(4-methoxyphenyl)-4-phenyl pyrylium perchlorate (PPP) on microcrystalline naphthalene in the pH range of 6.5-9.0 from a large volume of aqueous solutions of various samples. The method was based on the complexation between PPP and nitrate and then, extraction of the resulted complex from aqueous solution by microcrystalline naphthalene. The solid mass consisting of the nitrate complex and naphthalene was then dissolved in dimethyl formamide (DMF) and absorption of the resulted solution was obtained at 328 nm. The linear calibration range for the determination of nitrate was 15-135 μg L-1 with the detection limit of 10 μg L-1.