How Reproducible are Surface Areas Calculated from the BET Equation?

Porosity and surface area analysis play a prominent role in modern materials science. At the heart of this sits the Brunauer-Emmett-Teller (BET) theory, which has been a remarkably successful contribution to the field of materials science. The BET method was developed in the 1930s for open surfaces but is now the most widely used metric for the estimation of surface areas of micro- and mesoporous materials.

Exploring and expanding the Fe-terephthalate metal-organic framework phase space by coordination and oxidation modulation.

The synthesis of phase pure metal-organic frameworks (MOFs) - network solids of metal clusters connected by organic linkers - is often complicated by the possibility of forming multiple diverse phases from one metal-ligand combination. For example, there are at least six Fe-terephthalate MOFs reported to date, with many examples in the literature of erroneous assignment of phase based on diffraction data alone. Herein, we show that modulated self-assembly can be used to influence the kinetics of self-assembly of Fe-terephthalate MOFs.

Kinetic Control of Interpenetration in Fe-Biphenyl-4,4'-dicarboxylate Metal-Organic Frameworks by Coordination and Oxidation Modulation.

Phase control in the self-assembly of metal-organic frameworks (MOFs) is often a case of trial and error; judicious control over a number of synthetic variables is required to select the desired topology and control features such as interpenetration and defectivity. Herein, we present a comprehensive investigation of self-assembly in the Fe-biphenyl-4,4'-dicarboxylate system, demonstrating that coordination modulation can reliably tune between the kinetic product, noninterpenetrated MIL-88D(Fe), and the thermodynamic product, two-fold interpenetrated MIL-126(Fe). Density functional theory simulations reveal that correlated disorder of the terminal anions on the metal clusters results in hydrogen bonding between adjacent nets in the interpenetrated phase and this is the thermodynamic driving force for its formation.

Integrating child health information systems in public health agencies.

Public health agencies at state and local levels are integrating information systems to improve health outcomes for children. An assessment was conducted to describe the extent to which public health agencies are currently integrating child health information systems (CHIS). Using online technology information was collected, to assess completed and planned activities related to integration of CHIS, maturity of these systems, and factors that influence decisions by public health agencies to pursue integration activities.

[Imprint cytology of intracranial tumors].

Imprints of haematoxilin-eosin and Giemsa-stained, 33 surgically removed different intracranial tumors were examined. In case of sufficient number of cells and adequate clinical data, the cytological examination was suitable to quick intraoperative diagnosis in majority of cases. Its demonstration on GFAP smear facilitates the diagnosing of gliomas.

Immunocytochemical investigation of ACTH-cells and vasopressin in the pituitaries of humans died from myocardial infarction.

The pituitaries and adrenals of 30 patients died from extensive fresh myocardial infarction and of 25 patients died from other diseases were studied. In myocardial infarction the mean weight of the above glands was significantly higher than in other diseases. In most cases an increase in number of pituitary ACTH-cells was observed with the immunoperoxidase method.

Autopsy study of cerebral complications of congenital heart disease and cardiac surgery.

Detailed histological investigation of the brains of 45 neonates, infants and children who had died of various congenital heart defects revealed that the damage to the white matter occurred mostly below 3 months of age, while that to the grey matter occurred above this age. The lesions (glial fatty metamorphosis, telencephalic leucoencephalopathy, focal white matter necrosis, focal nerve cell pyknosis and symmetrical cortical necrosis) were often combined with each other. The necroses were generally not a consequence of microembolization.

[Changes in the nucleus ruber in 3-acetyl pryridine poisoning following unilateral ligation of the carotid artery].

A single-approximately LD50-dosis of the 3-AP given to white rats following the unilateral ligature of the carotid artery in almost 70 percent of the animals caused hydropic-vacuolic degeneration and cell necrosis in the nucleus ruber. Similar changes were quite infrequent in the mesenphalic nuclei. The regressiv changes can be prevented by nicotinamid.

Alterations of the nucleus ruber in 3-acetylpyridine intoxication. A light and electron microscopic study.

3-acetylpyridine (3-AP) given in one single dose near to LD50 causes hydropic-vacuolic degeneration and cellular necrosis of varying degree and extension in the red nucleus of white rats in more than 50 percent of the cases. Less frequently similar alterations have been observed in some neighbouring nuclei of the mesencephalon. The regressive damage is remarkably rare if a smaller dose of 3-AP is given and none if the animal is pretreated with nicotine amide.

[The significance of histochemical demonstration of oxidative enzymes in the interpretation of local and remote effects of experimental brain lesions].

In cortex, habenular- or hypothalamic regions of white rats electrocoagulation was carried out. Animals were killed from 6 days to 5 months after the operation. Serial slides of the brain were investigated by the aid of a reaction of SDH, alfa-GPDH, LDH, G6PDH, TPND.