In eukaryotes, fertilization relies on complex and specialized mechanisms that achieve the precise delivery of the male gamete to the female gamete and their subsequent union [1-4]. In flowering plants, the haploid male gametophyte or pollen tube (PT) [5] carries two nonmotile sperm cells to the female gametophyte (FG) or embryo sac [6] during a long assisted journey through the maternal tissue...

Emission spectra of the microplasma discharge in N2, NO and O2 gas mixture was analyzed. The diagnosis of microplasma discharge was performed in order to understand the processes of NOx removal. An experimental Marx Generator was used as a pulsed power supply. Emission spectra for N2 gas show N2 second positive band system (N2 SPS) and N2 first negative band system (N2 FNS). 1000 ppm NO in N2 e...

BACKGROUND The role of drainage, intrapleural fibrinolytics, and/or surgery in the management of thoracic empyema is controversial. OBJECTIVES We aimed to investigate the operational practice of empyema management at our hospital. METHODS Between January 2001 and December 2008, all patients with thoracic empyema were retrieved. After exclusion of patients with malignant effusion, traumatic ...

Chest tube is a flexible plastic tube used to discharge secretion in the cavity between the lungs and chest named pleural cavity. Normally, there is a small amount of fluid in the cavity between the lungs and chest; This fluid helps the movement of lungs during breathing without abrasion. Entrance of bit of air, blood or pus because injury in the pleural cavity can prevent the lungs from fully ...

Joule-Thomson cooling systems are used in refrigeration and liquefaction processes. There are extensive studies on Joule-Thomson cryogenic systems, but most of them coverage steady state conditions or lack from experimental data. In the present work, transient thermal behavior of Joule-Thomson cooling system including counter current helically coiled tube in tube heat exchanger, expansion valve...

Gas pulsations are defined presently as a macro flow rate and/or pressure fluctuation with relatively low frequency and high amplitude. They commonly exist in HVACR, energy and other processing industries, and are widely accepted to be mainly caused by PD type gas machinery such as reciprocating or rotary compressors, expanders and Roots type blowers. Moreover, they are believed to be responsib...

This paper reports on the preparation and characterization of thin films of silicon nitride deposited on heated silicon substrates from Si(CH, ),-NHS-H, mixtures activated at room temperature by an a-c. discharge at low frequency. The films were deposited at 800°C. Deposition rate as well as refractive index were measured and several parameters were systematically varied , including deposition ...