Microchemical Studies Research Articles

A microchemical study of the photodegradation of 4,4′-bis(diethylamino)benzophenone oxime on silica gel

A microchemical study of the photodegradation of 4,4′-bis(diethylamino)benzophenone oxime on silica gel

Microchemical study of gas-phase kinetics for three irreversible reactions

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrochemical study of gas-phase kinetics for three irreversible reactionsDavid G. Retzloff, B. M. Coull, and James CoullCite this: J. Phys. Chem. 1970, 74, 12, 2455–2459Publication Date (Print):June 1, 1970Publication History Published online1 May 2002Published inissue 1 June 1970https://doi.org/10.1021/j100706a007RIGHTS & PERMISSIONSArticle Views50Altmetric-Citations12LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (491 KB) Get e-Alerts

Microchemical studies of postnatal development in rat cerebrum. 2. Formation of myelin.

Microchemical studies of postnatal development in rat cerebrum. 2. Formation of myelin.

Microchemical studies of postnatal development in rat cerebrum. 1. Migration and differentiation of cells.

Microchemical studies of postnatal development in rat cerebrum. 1. Migration and differentiation of cells.

Studies on Wujiapi and some related crude drugs. II. Microchemical studies on Bei-Wujiapi and some related crude drugs. (1)

Studies on Wujiapi and some related crude drugs. II. Microchemical studies on Bei-Wujiapi and some related crude drugs. (1)

Chemical Studies in the Genus Lobaria and the Occurrence of a New Tridepside, 4-O-Methylgyrophoric Acid

Chemical Studies in the Genus Lobaria and the Occurrence of a New Tridepside, 4-O-Methylgyrophoric Acid

A quantitative microchemical study of choline acetyltransferase and acetylcholinesterase in the cerebellum of several species

Discrete areas of the cerebella of five species (rat, pigeon, guinea pig, rabbit, and cat) have been examined for their content of choline acetyltransferase activities. The various layers of the cerebellar cortex for all species was shown to have a much lower activity than that of other structures of the nervous system. The choline acetyltransferase activity of the subcerebellar nuclei, however, was found to be greater than any of the cortical strata. Whether this latter observation is related to extrinsic cerebellar afferent fibers, or indicative of an intrinsic cholinergic pathway derived from neurons present in the subcerebellar nuclei needs to be resolved. The quantitative determination of acetylcholinesterase in the various cerebellar layers of the different species was also studied. A comparison of the distribution of acetylcholinesterase and choline acetyltransferase in the five species studied suggests that there is no apparent correlation between the levels of these two enzymes in the various cerebellar strata or nuclei.

A microchemical study of the activities of some dehydrogenases in the normal and infected skin of the external auditory canals of cats and humans.

A microchemical study of the activities of some dehydrogenases in the normal and infected skin of the external auditory canals of cats and humans.

STUDIES IN THE PSEUDOASCOBOLEAE

Comparative structural and microchemical studies of selected genera of the Pseudoascoboleae (= Theleboleae), i.e. Ryparobius Boud., Ascozonus (Renny) Boud., Thecotheus Boud., Lasiobolus Sacc, Ascophanus Boud., and Thelebolus Tode, revealed that many of the genera were polytypic. Characters presently used to distinguish these genera are considered to be artificial, and true relation ships cut across accepted generic lines.

ON THE ABSCISSION REGION IN LEAVES OF THE BLUE SPRUCE

The problem of leaf fall due to desiccation was re-examined in Picea. It was found that abscission took place with equal facility regardless of which side of the abscission zone was subjected to more rapid desiccation; that prior to a certain stage of development the leaves failed to fall when dried; and that, for some time after this, they fell more rapidly than after reaching maturity. Microchemical study indicated that a change from pectic acid to soluble pectin in the abscission layer coincided in time with the earliest stage at which fall would be produced by desiccation, and that the decreasing ease of abscission for some time after this corresponded with the increase in amount and lignification of the secondary vascular tissue. It was concluded that the changes leading to abscission here are identical with those in deciduous forms and that the leaves are retained on the branches because of their strong vascular bundles, which become brittle on drying.

A New Genus Based on Fistulina brasiliensis

SUMMARYThe new genus Pseudofistulina is described with the type species Pseudofistulina brasiliensis (= Fistulina brasiliensis O. and K. Fid.). Anatomical and microchemical studies on the type species are described. The pileus is found to be composed of derma, context, and tubular layer and the stipe composed of derma, pseudoparenchyma, and medulla. Derma is formed by anticlinal elements, the acanthophyses, which have internal deposits of amyloid hemicellulose. Fatty substances were observed externally at the base of the acanthophyses.The context is composed of upper pseudoparenchyma, intermediate layer, and lower pseudoparenchyma. The pseudoparenchymatous layers, especially the upper one, give positive reactions for callose and tannic substances; in polarized light very small crystals were seen only in the upper pseudoparenchyma. The intermediate layer has, near the pseudo-parenchymas, globose to obovate sphaerocysts, with contents that react with iodine solutions giving a yellow to orange color. The species is monomitic, formed by simple-septate and nonamyloid generative hyphae and has globose to subglobose, hyaline, nonamyloid spores.

A New Genus Based on Fistulina Brasiliensis

SUMMARYThe new genus Pseudofistulina is described with the type species Pseudofistulina brasiliensis (= Fistulina brasiliensis O. and K. Fid.). Anatomical and microchemical studies on the type species are described. The pileus is found to be composed of derma, context, and tubular layer and the stipe composed of derma, pseudoparenchyma, and medulla. Derma is formed by anticlinal elements, the acanthophyses, which have internal deposits of amyloid hemicellulose. Fatty substances were observed externally at the base of the acanthophyses.The context is composed of upper pseudoparenchyma, intermediate layer, and lower pseudoparenchyma. The pseudoparenchymatous layers, especially the upper one, give positive reactions for callose and tannic substances; in polarized light very small crystals were seen only in the upper pseudoparenchyma. The intermediate layer has, near the pseudo-parenchymas, globose to obovate sphaerocysts, with contents that react with iodine solutions giving a yellow to orange color. The species is monomitic, formed by simple-septate and nonamyloid generative hyphae and has globose to subglobose, hyaline, nonamyloid spores.

BIOCHEMICAL AND MICROCHEMICAL STUDY OF THE CELL WALLS OF RHIZIDIOMYCES SP.

Fuller, Melvin S. (Brown U., Providence, R. I.) Biochemical and microchemical study of the cell walls of Rhizidiomyces sp. Amer. Jour. Bot. 47(10): 838–842. lllus. 1960.—The presence of chitin in the cell walls of the fungus Rhizidiomyces is demonstrated by qualitative analysis of enzymatic and hydrochloric‐acid hydrolysates of partially cleaned cell walls. Qualitative examination of the enzymatic and acid hydrolysates did not, however, serve for the detection of cellulose present in the cell walls of Rhizidiomyces. With microchemical tests, both chitin and cellulose can be detected. These microchemical tests served to indicate the localization of the chitin and cellulose in the cell walls of mature plants before and during zoospore discharge.

Biochemical and Microchemical Study of the Cell Walls of Rhizidiomyces Sp.

Fuller, Melvin S. (Brown U., Providence, R. I.) Biochemical and microchemical study of the cell walls of Rhizidiomyces sp. Amer. Jour. Bot. 47(10): 838–842. lllus. 1960.—The presence of chitin in the cell walls of the fungus Rhizidiomyces is demonstrated by qualitative analysis of enzymatic and hydrochloric-acid hydrolysates of partially cleaned cell walls. Qualitative examination of the enzymatic and acid hydrolysates did not, however, serve for the detection of cellulose present in the cell walls of Rhizidiomyces. With microchemical tests, both chitin and cellulose can be detected. These microchemical tests served to indicate the localization of the chitin and cellulose in the cell walls of mature plants before and during zoospore discharge.

Microchemical studies on single Haversian systems: II. Methodological considerations with special reference to the [formula omitted] ratio in microscopic bone structures

A micromethod for the separation of the cations and anions of the bone salt in microscopic bone structures was developed. Microchemical analysis for calcium and phosphorus in Haversian systems and in selected portions of lamellar bone dissected from a transverse section of normal human compact bone tissue was performed. The Ca P ratio of each analyzed structure was determined. No significant variations of the Ca P ratios of the morphologically different structures could be demonstrated. Nor were any variations of the Ca P ratios observed when comparing structures of varying degrees of mineralization.

Microchemical studies on single Haversian systems: I. Methodological considerations with special reference to variations in mineral content

Guided by microradiograms of ground sections of bone tissue, Haversian systems of varying degrees of X-ray absorption and selected portions of interstitial and lamellar bone were dissected out. Chemical analysis was performed to determine the phosphorus and nitrogen content in these structures. The P/N ratio was selected as a measure of the degree of mineralization. A close agreement could be demonstrated between the P/N ratio in these structures and the corresponding X-ray absorption in the microradiograms. It was found that nitrogen was uniformly distributed throughout the compact bone tissue, whereas the amount of phosphorus per unit volume varied around 25 per cent in different microscopic structures. The P/N ratio increased from 2.03 in the least mineralized Haversian systems to 2.53 in the fully mineralized systems and to 2.65 in the highly mineralized lamellar bone. In some Haversian systems the degree of mineralization was found to be scarcely 70 per cent of that of the highly mineralized bone tissue.

Micro-Chemical Studies on Normal Cerumen: II. The Percentage of Lipid and Protein in Casual and Fresh Cerumen

A knowledge of the composition of the surface film of the skin of the external auditory canal is of fundamental importance if we are to understand its possible protective function. Since the composition of casualf cerumen that has remained in the ear for a period of weeks or months may not be the same as that of fresh cerumen, the study herein reported was undertaken to measure any difference between the two.

The electron microscopic and microchemical studies of tumour cell

The electron microscopic and microchemical studies of tumour cell

番椒の研究 (第2報)

Distribution and generation of capsaicin were examined and it was found that it was not present in any plant organs other than the fruit. It was found that the epidermal cells of dissepiment in fruit undergoes segmentation and proliferation in the direction perpendicular to the surface and capsaicin forms first in oily state between its outer cell wall and cuticle. Capsaicin crystals precipitate out as colorless tetragonal to hexagonal plates in the secretion organs of dried fruit or fresh fruit sealed with glycerol water. From microchemical studies, the secretion chiefly consits of capsaicin and fatty oil and it is assumed that it is formed as a lipid-capsaicin complex in nature.

Hepatic alkaline phosphatase: Histological and microchemical studies on liver tissue in normal subjects and in liver and in bone disease

The Journal of Pathology and BacteriologyVolume 59, Issue 4 p. 615-630 Article Hepatic alkaline phosphatase: Histological and microchemical studies on liver tissue in normal subjects and in liver and in bone disease Sheila Sherlock, Sheila Sherlock Beit Memorial Research Fellow Departments of Medicine and Pathology, British Postgraduate Medical School, LondonSearch for more papers by this authorVeryan Walshe, Veryan Walshe Departments of Medicine and Pathology, British Postgraduate Medical School, LondonSearch for more papers by this author Sheila Sherlock, Sheila Sherlock Beit Memorial Research Fellow Departments of Medicine and Pathology, British Postgraduate Medical School, LondonSearch for more papers by this authorVeryan Walshe, Veryan Walshe Departments of Medicine and Pathology, British Postgraduate Medical School, LondonSearch for more papers by this author First published: October 1947 https://doi.org/10.1002/path.1700590412Citations: 38AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume59, Issue4October 1947Pages 615-630 RelatedInformation