Showing papers by "Academia Sinica published in 1970"
TL;DR: As reported in this paper, barthii was found to be isolated from its related taxa by a crossing barrier and the genetic basis of the crossing barrier was estimated to be the so-called A genome.
Abstract: Oryza perennis Moench, distributed throughout the humid tropics, comprises four main geographical forms, Asian, African, American, and Oceanian (Morishima, 1969). The African form was considered by Tateoka (1963) to be O. barthii, but the present writers take it as a subspecies of O. perennis (d. Chandler, 1964, p. 251-2). For convenience, it is simply called barthii in this paper. In West Africa, four species having the so-called A genome often grow sympatrically, i.e., O. perennis (barthii), O. sativa (introduced from Asia), O. breviligulata, and O. glaberrima. Natural hybrids between them are rare, however, except between breviligulata and glaberrima (Oka and Chang, 1964). As reported in this paper, barthii was found to be isolated from its related taxa by a crossing barrier. To estimate the genetic basis of the crossing barrier, histological and genetic investigations were made in crosses with barthii.
40 citations
TL;DR: The role of aminotransferase in the synthesis of IAA from tryptophan is considered to be minor to that of the oxidative decarboxylase-hydrolase system in this bacterium.
Abstract: An aminotransferase with broad specificity was partially purified from Pseudomonas savastanoi. The enzyme catalyzes the conversion of L-tryptophan to indole-3-pyruvic acid (IPYA) but transaminates more readily with other amino acids. Optimal activity occurs at pH 8.8. The aminotransferase shows broad specificity for both amino donors and acceptors. Indole- 3-acetic acid (IAA) and indole-3-acetamide (IAM) at 3×10-3M inhibit minotransferase activity 30% and 26%, respectively. Specific activity of aminotransferase from cells grown in a medium with L-tryptophan or IAA does not appear to affect production of the enzyme. Whole cells of Pseudomonas savastanoi convert IPYA to IAA but the overall conversion is slower than the rate of conversion of IAM to IAA. The role of aminotransferase in the synthesis of IAA from tryptophan is considered to be minor to that of the oxidative decarboxylase-hydrolase system in this bacterium.
20 citations
TL;DR: The development of the carposporophyte of Scinaia pseudojaponica Yamada et Tanaka is described for the first time andCarposporangia are produced in chains from the free ends of the gonimoblast filaments which grow toward the surface of the thyllus.
Abstract: SUMMARY
The development of the carposporophyte of Scinaia pseudojaponica Yamada et Tanaka is described for the first time. The carpogonial branch is 3-celled. Before fertilization the hypogynous cell divides into a group of 4 cells. Concurrently the cell beneath the hypogynous cells also produces initials which, following fertilization, develop into branched filaments that envelop the carposporophyte. After fertilization the gonimoblast initial is produced laterally from the basal part of the carpogonium. Carposporangia are produced in chains from the free ends of the gonimoblast filaments which grow toward the surface of the thyllus. A very thick pericarp surrounds the mature carposporophyte.
8 citations
TL;DR: In this article, the 27Al(d, p)28Al reaction at bombarding energies between 2.0 and 3.0 MeV was studied at two angles of 90° and 150° and angular distributions from 15° to 150° were measured for four proton groups.
Abstract: The27Al(d, p)28Al reaction was studied at bombarding energies between 2.0 and 3.0 MeV. Excitation functions in steps of 15 keV at two angles of 90° and 150° and angular distributions from 15° to 150° were measured for four proton groups leading to the low-lying levels of28Al. Two mechanisms of compound nucleus and direct interaction were found to be contemporaneously present in the reaction. The direct effect contribution for the grouppo corresponding to the ground-state transition was calculated by the DWBA stripping theory. The experimental total cross-sections at 2.5 MeV compared to the Hauser-Feshbach calculations are given and discussed.
6 citations
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2 citations
01 Jan 1970
2 citations
TL;DR: In this article, the full structures of glycans, including diastereomers and anomericity of each monosaccharide and linkage position of each glycosidic bond, can be determined using tandem mass spectrometry guided by a logically derived sequence (LODES).
Abstract: Here we show the full structures of glycans, including
diastereomers and anomericity of each monosaccharide and linkage position of
each glycosidic bond, can be determined using tandem mass spectrometry guided
by a logically derived sequence (LODES). This new method provides de novo
oligosaccharide structural identifications with high sensitivity and was
applied to automatically in situ structural determination of the oligosaccharides eluted by high performance liquid chromatography. We showed
that the structure of a given trisaccharide from trisaccharide mixture and
bovine milk were determined from
near three
thousand isomers by using six to seven logically selected CID spectra.
The entire procedure of mass spectrum measurement guided by LODES can be
programmed in computer for automatically full glycan structural identification,
a goal that remains a great challenge in glycan analysis.
1 citations