9,9-Bis[4-(prop-2-yn­yloxy)phen­yl]-9H-fluorene

In the title compound, C31H22O2, the bond angle at the C atom belonging to the five-membered ring of the fluorene system is opened to 112.64 (12)°. The two benzene rings are twisted with respect to the fluorene ring system at dihedral angles of 72.81 (6) and 81.83 (6)°. One Car­yl—O—C—C  fragment is extended, with a C—O—C—C torsion angle of −178.77 (13)°, but the other Car­yl—O—C—C  fragment is bent, with a C—O—C—C torsion angle of 64.78 (19)°. Inter­molecular weak C—H⋯O hydrogen bonding is present in the crystal structure

(Butane-1,3-diyne-1,4-diyl)bis­(tri­isopropyl­silane)

The mol­ecule of the title compound, C22H42Si2, lies on a center of inversion, and the triisopropyl­silyl groups are staggered

Do Exchange Rates Fluctuations Influence Gold Price in G7 Countries? New Insights from a Nonparametric Causality-in-Quantiles Test

In the recent era, gold is considered an essential investment source, a source of hedging inflation, and a medium of monetary exchange. The gold and exchange rate nexus become prominent after events like sovereign debt crisis, subprime mortgage crisis, low-interest rate problem, and global financial market solvency. These events attract the attention of researchers and academician for investigating the dynamics of the relationship between gold and exchange rates, and the majority of the studies discusses the linear dynamics, but the non-linear dynamics are ignored. Therefore, the current research investigates the non-linear dynamics of gold price and exchange rate relationship in G7 countries using the new technique named the nonparametric causality approach. This study uses monthly data from the years 1995(January)-2017 (March). The empirical results show that exchange rate return causes gold prices in four out of G7, especially at the low tails. This study also gives valuable insights for monetary policymakers, gold exporter’s international portfolio managers, and hedge fund managers

2,2′-[Biphenyl-2,2′-diylbis(­oxy)]diacetic acid monohydrate

In the crystal structure of the title compound, C16H14O6·H2O, the dihedral angle between the benzene rings is 60.8 (3)°. Mol­ecules are linked through a bifurcated O—H⋯O hydrogen bond, forming a zigzag chain along the b axis. The chains are further linked by O—H⋯O hydrogen bonds mediated by water mol­ecules

Ethyl 2-(3-acetyl-6-methyl-2-oxo-2H-pyran-4-yl­oxy)acetate

The title compound, C12H14O6, features a roughly planar mol­ecule (r.m.s. deviation for all non-H atoms = 0.287 Å). In the crystal, the mol­ecules are held together by C—H⋯O hydrogen bonds

Object-Oriented Software Testing: A Review

Object-oriented (OO) software systems present specific challenges to the testing teams. As the object-oriented software contains the OO methodology and its different components, it is hard for the testing teams to test the software with arbitrary software components and the chance of errors could be increased. So different techniques, models, and methods researchers identified to tackle these challenges. In this paper, we are going to analyze and study the OO software testing. For handling challenges in OO software testing, different techniques and methods are proposed like UML diagrams, evolutionary testing, genetic algorithms, black-box testing, and white-box testing. The methodology used for research is literature review (LR) of the recent decay

N,N′-Bis(4-methoxy­benzyl­idene)-4,4′-(m-phenyl­enedi­oxy)dianiline

Mol­ecules of the title compound, C34H28N2O4, a Schiff base precursor for macrocycles, are located on a mirror plane. The C=N double bond is trans configured. Inter­molecular C—H⋯O inter­actions stabilize the crystal packing

Post Thrombolytic St-Segment Resolution Outcome in Acute Myocardial Infarction Patients

OBJECTIVES: The main objective of this study was to assess post thrombolytic resolution of ST-segment and its outcome in patients with acute myocardial infarction. METHODOLOGY: This Prospective Comparative Study was carried out at the Cardiology Unit of Ayub Teaching Hospital, Abbottabad. All patients irrespective of gender and age with ST-Segment elevation myocardial infarction (STEMI), having no immediate access to angioplasty and thrombolysed with streptokinase, were included in this study. ECG was taken at the beginning and 90 minutes after the administration of streptokinase. Based on ST-segment resolution on ECG taken at 90 minutes these patients were classified into group A and B. Group A included patients with ST-segment resolution while group B showed no resolution of ST-segment after streptokinase administration. These patients were followed during their hospital stay for complications such as arrhythmias, cardiogenic shock, acquired ventricular septal defects (VSD) aneurysm and death. RESULTS: Among 115 patients, 94 were male and 21 female. Group A included 102 (89%) patients and group B included 13 (11%). In group A, only 1 (0.98 %) patient developed complications and in group B, 13 patients (100%) developed complications. Arrhythmias were the most common complication among MI patients in group A while cardiogenic shock was the commonest complication in group B. CONCLUSION: ST-segment resolution is a practical and applicable indicator of successful thrombolysis and has a significant correlation with clinical outcome in acute myocardial patients after thrombolysis with streptokinase