Life Sciences Commons^™

X-Ray Microanalysis In Cryosections Of Natively Frozen Paramecium Caudatum With Regard To Ion Distribution In Ciliates, M. Schmitz, R. Meyer, K. Zierold

Scanning Electron Microscopy

Cells of Paramecium caudatum were shock-frozen without pretreatment for cryoultramicrotomy and freeze-dried for subsequent X-ray microanalysis. Na, Mg, P, S, Cl, K, and Ca were detected in different amounts in several subcellular compartments. In particular, calcium was localized below the cell surface (pellicle). Trichocysts were found to contain significant amounts of Na in their base but not in the tip. Na, Mg, P, S, Cl, K, Ca were found in electron dense deposits within the lumen of the contractile vacuole. A small K concentration was found in the cytoplasm and in the mitochondria. X-ray microanalysis of the element distribution in …

Scanning Electron Microscopy In Retinal Research, Bessie Borwein

Scanning Electron Microscopy

The literature on scanning electron microscopy (SEM) pertaining to the retina has been surveyed and described.

The first two papers on SEM and retina appeared in 1969. Most of the earlier studies concentrated on descriptions [by SEM alone, or with light microscopy (LM) and transmission electron microscopy (TEM)] of the appearance of various retinae and retinal cells [fish, newt, primates, rodents and rabbits, bullfrog]; or embryology of the chick retina. Two papers dealt with retinal disease. In all there were 25 papers in SEM/retinal research before and in 1974. Since 1975 there have been 111 papers which have used SEM …

A Rapid Technique For Counting Cracks In Rocks, W. B. Durham, J. M. Beiriger, H. C. Weed

Scanning Electron Microscopy

Using a scanning electron microscope (SEM) and an image analyzer, we have developed a technique for counting and measuring cracks in rocks which is more efficient than traditional techniques in which an operator performs all image analysis functions. The key aspect of the technique is that black-on-white tracings of fresh cracks, which can be made rather rapidly by an operator, are measured and digitized by an image analyzer. The most time-consuming step in the process has now become the generation of SEM micrographs and pertinent chemical (mineralogical) information, not the quantification of crack structure. The technique has been applied to …

The First International Workshop On Multiple Endocrine Neoplasia Type 2 Syndromes, Charles E. Jackson

Henry Ford Hospital Medical Journal

No abstract provided.

Front Matter

Henry Ford Hospital Medical Journal

No abstract provided.

The Calcitonin Assay And Multiple Endocrine Neoplasia Type 2 Syndromes: Historical Footnote, Kenneth E. W. Melvin

Henry Ford Hospital Medical Journal

No abstract provided.

Multiple Endocrine Neoplasia Type 2 Syndromes: Historical Perspectives, John H. Sipple

Henry Ford Hospital Medical Journal

No abstract provided.

Central Registration Of Multiple Endocrine Neoplasia Type 2 Families In The Netherlands, C. J. M. Lips, E. Den Aantrekker, J. M. Jansen-Schillhorn Van Veen, R. A. Geerdink, G. Griffioen, E. A. Van Slooten

Henry Ford Hospital Medical Journal

No abstract provided.

Register Of Multiple Endocrine Neoplasia Type 2 Syndromes In The United Kingdom, Bruce A. J. Ponder

Henry Ford Hospital Medical Journal

A collaborative group for the study of multiple endocrine neoplasia type 2 (MEN-2) syndromes comprised of clinicians and laboratory scientists has been set up in the United Kingdom. Its aims are 1) to provide a basis for collaborative work on MEN-2; 2) to establish a register of patients; 3) and specifically to conduct studies aimed at defining the best policy for screening the families of apparently sporadic patients, to establish radioimmunoassays for family screening, and to identify large kindreds for genetic linkage studies using DNA polymorphisms.

Impact Of Screening On Prognosis In The Multiple Endocrine Neoplasia Type 2 Syndromes: Natural History And Treatment Results In 105 Patients, Margareta Telenius-Berg, Bertel Berg, Bertil Hamberger, Sten Tibblin, Lars-Erik Tisell, Lars Ysander, Gunnar Welander

Henry Ford Hospital Medical Journal

We evaluated the effects of screening for multiple endocrine neoplasia type 2A (MEN-2A) in 12 families. Genealogical studies going back to 1730 show a common ancestry for seven Swedish families and one American family. The total number of patients included 105 individuals, 68 of whom were diagnosed by our screening program. Our screening methods for medullary carcinoma of the thyroid (MTC) had an optimal sensitivity and specificity. The frequency of gene carriers detected in MEN-2A families was 55%. Screening will lead to early diagnosis and early therapy, which in turn, will significantly decrease morbidity, incidence of surgical complications, and mortality …

Screening For Hereditary Medullary Cancer In Denmark, Kristian Emmertsen

Henry Ford Hospital Medical Journal

Screening of first-degree relatives of patients with medullary thyroid cancer (MTC) gave normal values of pentagastrin-stimulated serum calcitonin and 24-hour urinary catecholamine levels in the relatives of 18 of 22 patients. This result is considered to be valid evidence for sporadic MTC. Absence of C-cell hyperplasia maybe another indication of sporadic MTC. Four hereditary MTCs were represented by one fully expressed MEN-2B patient without affected relatives, one fully expressed MEN-2A case in one family, and two first cousins with MTC as the only MEN-2A lesion in another family. Fourteen relatives of the MEN-2A patients had elevated serum calcitonin levels, and …

A French Canadian Family With Multiple Endocrine Neoplasia Type 2 Syndromes, Maurice B. Verdy, Marcel Cadotte, Walter Schurch, William C. Sturtridge, Jacques Cantin, Andrée M. Weber, André Lacroix, Cynthia Forster-Gibson

Henry Ford Hospital Medical Journal

No abstract provided.

Familial Medullary Carcinoma Of The Thyroid: Clinical Studies In Northern New England, Walter W. Noll, L. Herbert Maurer, Victoria L. Herzberg, Paul J. Beisswenger, Brian M. Quinn, Charles C. Cate, Jane P. Bassick, Patricia A. Clark, Thomas A. Colacchio

Henry Ford Hospital Medical Journal

No abstract provided.

Chromosomes In Multiple Endocrine Neoplasia Type 2 Syndromes, Daniel L. Van Dyke, V. Ramesh Babu, Charles E. Jackson

Henry Ford Hospital Medical Journal

In 19 patients from nine MEN-2A families, high-resolution C-banded chromosome studies have revealed a visible deletion within sub-band 20p12.2, yet no abnormality was observed in a 10th family. A deletion indistinguishable from that in MEN-2A was observed in five patients from three MEN-2B families but not in two other MEN-2B families. We found no abnormality in the entire karyotype of the four MEN-1 patients studied. These findings suggest that the mutation in most MEN-2 patients is a visible deletion in the short arm of chromosome 20.

Multiple Endocrine Neoplasia Type 2 Syndromes In Japan, Shin-Ichiro Takai, Akira Miyauchi, Hideo Matsumoto, Tatsuro Ikeuchi, Tetsuro Miki, Kanji Kuma, Yuichi Kumahara

Henry Ford Hospital Medical Journal

Through nationwide surveys, we collected and analyzed 242 patients of medullary thyroid carcinoma (MTC). Included were 40 patients with multiple endocrine neoplasia type 2A (MEN-2A), six patients with MEN-2B, and 36 patients with only MTC having a positive family history (82 total patients in the hereditary group). Ten-year survival rates were 81.5% for all cases, and 97.5% and 76.1% for the hereditary and the sporadic group, respectively. Epinephrine/norepinephrine ratio in the urine was found to be a good indicator of the adrenomedullary hyperfunction in patients with hereditary MTC. At least one patient in each family with hereditary MTC had overt …

Book Review: Medical Meanings, Fred W. Whitehouse

Henry Ford Hospital Medical Journal

No abstract provided.

Linkage Data Excluding A Locus For Multiple Endocrine Neoplasia Type 2 Syndromes From The Distal Part Of The Short Arm Of Chromosome 11, Kenneth K. Kidd, Susan D. Kruger, Daniela S. Gerhard, Judith R. Kidd, David Housman, Joseph M. Gertner

Henry Ford Hospital Medical Journal

A study designed to identify the location of a gene for multiple endocrine neoplasia type 2 (MEN-2) is being performed using a single large family segregating for MEN-2A. Here we report our initial results using a set of DNA restriction fragment length polymorphisms spanning a 40 cM segment of the short arm of human chromosome 11. The locus for MEN-2 in this family is excluded from this entire region which includes an oncogene, c-Ha-ras-1, two hormone loci, insulin and parathyroid, and the five hemoglobin genes in the beta hemoglobin gene duster. This is the first exclusion of such a large …

The Molecular Basis Of Polypeptide Hormone Production By Medullary Thyroid Cancer, C. J. M. Lips, P. H. Steenbergh, J. W. M. Höppener, J. Zandberg, H. S. Jansz

Henry Ford Hospital Medical Journal

Using recombinant DNA techniques, we analyzed the structure of human calcitonin (CT)-encoding DNA. The sequence of nucleotides derived from the messenger RNA (mRNA) predict the amino acid sequence of the entire human CT precursor protein. The complete CT gene could be isolated from a DNA library of the human genome. The CT precursor encoding sequences (exons) as well as the noncoding intervening sequences (introns) could be identified. Another sequence, called human calcitonin gene-related peptide (hCCRP), could be located near this CT-encoding DNA. A genomic fragment encoding hCCRP was used as a probe to detect and isolate the corresponding mRNA in …

Scintigraphy With 1-131 Mibg As An Aid To The Treatment Of Pheochromocytomas In Patients With The Multiple Endocrine Neoplasia Type 2 Syndromes, James C. Sisson, Brahm Shapiro, William H. Beierwaltes

Henry Ford Hospital Medical Journal

We reviewed the scintigraphic images made after injections of 1-131 metaiodobenzylguanidine (MIBG) or 1-123 MIBG in patients with multiple endocrine neoplasia (MEN) types 2A and 2B. The information we obtained was applied to three questions about the treatment of pheochromocytoma in patients affected with these syndromes. Our first question "When should adrenal gland(s) be removed?" was not directly answered. However, adrenalectomy generally should not be contemplated unless distinct abnormalities are present in the scintigraphic images. With experience it may be possible to approximate, from the stage of pheochromocytoma depicted by scintigraphy, how many years will elapse before symptoms or hypertension …

Research Vistas In The Multiple Endocrine Neoplasia Syndromes, John J. Mulvihill

Henry Ford Hospital Medical Journal

Progress in understanding the single gene, cytogenetic, and multifactorial traits that predispose to human cancer suggests possible new directions for research in the multiple endocrine neoplasia (MEN) syndromes. Among the other 200 or so monogenic disorders associated with human neoplasia, advances have come from further delineation of syndromes by various clinical specialists, the recognition of subtypes of syndromes previously thought to be homogeneous, the search for in vitro manifestations of the mutant gene in fibroblasts, and the establishment of cell, tissue and patient registries and of voluntary lay organizations to serve as advocates for the disease. With regard to cytogenetics, …

Genetic Studies Of Multiple Endocrine Neoplasia Type 2 Syndromes: A Workshop Commentary, Nancy E. Simpson

Henry Ford Hospital Medical Journal

No abstract provided.

Back Matter

Henry Ford Hospital Medical Journal

No abstract provided.

Surface Roughness Contribution To The Auger Electron Emission, D. Wehbi, C. Roques-Carmes

Scanning Electron Microscopy

Scanning Auger Microscopy (SAM) experiments have shown that z height and θ slope relative to the analysed spot are parameters that contribute to the measured Auger intensity I(z, θ). For greater analysed areas specific to Auger Electron Spectroscopy (AES), the knowledge of height and slope statistical distributions P(z) and P(θ) is required. These functions have been determined by means of profilometric data. The spatial resolution of the used tactile profilometer is similar to that which characterizes AES. A mathematical relationship I { P(z), P(θ) } has been set up for Si samples whose roughness is well defined. On the other …

Sputtered Thermal Ion Mass Spectrometry As A New Quantitative Method For In-Depth Analysis, G. Blaise

Scanning Electron Microscopy

The Sputtered Thermal Ion Mass Spectrometry method (STIMS) consists of collecting a part of the matter sputtered from a solid by ion bombardment into a heated cell where it is reduced into atoms. A thermal ionization process or an electron impact process taking place in the cell yields ions which are extracted and mass analyzed. The composition of the solid is determined from ion intensities after calibration of ionization coefficients. It has been demonstrated that the method has an absolute quantitative character. Applications to elemental quantitative analysis (identification of new compounds in diffusion couples, dust particle analysis) and in-depth analysis …

Wave-Length Dispersive Microprobe Analysis Of Coated Samples Of Bulk Tissues, C. Ward Kischer, Thomas M. Teska

Scanning Electron Microscopy

Hypertrophic scars contain highly pleomorphic cells, including many from the erythrocytic series which have been extravasated. The conventional visual mode of SEM cannot distinguish the cell types with certainty except in the case of typical biconcave disc-shaped erythrocytes. Microprobe elemental analysis might be used to differentiate one type from another on the basis of iron and possibly phosphorus (for nucleated cells). Using coated specimens (gold or gold-palladium) precludes simultaneous visual mode SEM with EDX because of energy line interference with phosphorus and other elements. However, wave-length dispersive analysis offers minimal or no interference, and a coated specimen offers the use …

Progress In Element Analysis On A High-Voltage Electron Microscope, W. F. Tivol, D. Barnard, T. Guha

Scanning Electron Microscopy

X-Ray microprobe (XMA) and electron energy-loss (EELS) spectrometers have been installed on the high-voltage electron microscope (HVEM). The probe size has been measured and background reduction is in progress for XMA and EELS as are improvements in electron optics for EELS and sensitivity measurements.

XMA is currently useful for qualitative analysis and has been used by several investigators from our laboratory and outside laboratories. However, EELS background levels are still too high for meaningful results to be obtained. Standards suitable for biological specimens are being measured, and a library for quantitative analysis is being compiled.

Oxidation Of Aluminum Studied By Ion Scattering Spectroscopy (I.S.S) In A Scanning Auger Microscope, M. Gautier, J. P. Duraud, J. P. Vigouroux, C. Le Gressus, R. Shimizu

Scanning Electron Microscopy

The set up of an ion gun, producing a focused beam in the analysis chamber of a Scanning Auger Microscope permits ion scattering experiments: surface studies performed by electron spectroscopies can then be enlarged by Ion Scattering Spectroscopy (I.S.S.) to get additional information.

I.S.S. appears to be very sensitive to the cleanliness of the surface: comparison between Electron Energy Loss Spectroscopy (E.E.L.S.) and I.S.S. studies on clean samples show that I.S.S. can still detect oxygen even when it is not detectable by E.E.L.S.

Preliminary results on oxidation of Al (111) and Al (100) give oxidation curves in good agreement with …

Cross-Sectional Analysis Of Silicon Metal Oxide Semiconductor Devices Using The Scanning Electron Microscope, Daniel S. Koellen, David I. Saxon, Kenneth E. Wendel

Scanning Electron Microscopy

A technique has been developed which enables one to cross-section specific devices or features for examination with the scanning electron microscope (SEM). This method is used for investigation of all facets of microelectronic circuit manufacture from research and development to failure analysis of the finished product.

Selective etching is used to provide contrast to each processed layer. Etch type and sequence, used for delineation, are important to understand since they may add artifacts to the cross-section, leading to erroneous analysis conclusions. The etchant and etch conditions used will be dictated by the information needed from a particular sample.

Etching systems …

Digital Processing Of Electron Energy Loss Spectra And Images, R. D. Leapman, K. E. Gorlen, C. R. Swyt

Scanning Electron Microscopy

Processing in electron energy loss spectroscopy involves both data acquisition and analysis. The interface of an analytical electron microscope to a laboratory computer with a satellite microcomputer dedicated to data acquisition results in a system with a high degree of flexibility. In spectrum acquisition, channels may be selected around specific core edges, or dwell times may be varied continuously as a function of energy loss to reduce the dynamic range of the signal. Data transfer to the host computer allows further analysis such as the removal of plural scattering by spectral deconvolution. Elemental maps and line-scans can be recorded with …

Intracellular Localization Of Heavy Metals In Yeast By X-Ray Microanalysis, Ljerka Kunst, Godfried M. Roomans

Scanning Electron Microscopy

The intracellular localization of heavy metals in yeast cells was studied by means of energy-dispersive X-ray microanalysis. The yeast, Saccharomyces cerevisiae, was pretreated with phosphate and then loaded with different metal ions, by suspending the cells in salt solutions (Ni, Zn, Cd, Pb, Al and Cr). For the analysis, the cells were embedded in gelatin, rapidly frozen, and thin cryosections were cut on a dry knife.

A considerable uptake of divalent cations by the yeast cells was found to occur. The cations were bound to the polyphosphate granules localized in or close to the cell vacuoles. Immediately after phosphate …