Helicobacter pylori (H. pylori) is a helically-shaped bacterium that is usually found in the stomach. It burrows through the gastric mucouslining to establish an infection in the stomach's epithelial cells (see photo). Approximately 90% of the people infected with H. pylori willnever experience symptoms. Others may develop peptic ulcers and show symptoms of chronic gastritis. The method of motility of H.pylori is a prokaryotic flagellum attached to the back of the bacterium that rigidly rotates like a propeller on a ship. The flagellum iscomposed of proteins and is approximately 40.0 nm in diameter and can reach rotation speeds as high as 1.50 x 103 rpm. If the speedof the bacterium is 10.0 μm/s, how far has it moved in the time it takes the flagellum to rotate through an angular displacement of 5.00* 10² rad?Zina Deretsky, National ScienceFoundation/FlickrH. PYLORI CROSSING MUCUS LAYER OF STOMACHH.pylori Gastric Epithelialmucin cellsgelNumberi318UnitsumH.pylori raises pH,mucin de-gels回

To calculate the distance moved by Helicobacter pylori during an angular displacement of 5.0×102 We…

Answered: Helicobacter pylori (H. pylori) is a…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Introduction

Section: Chapter Questions

Problem 31P: (a) About how many microorganisms are found in the human intestinal tract? (A typical bacterial...

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Helicobacter pylori (H. pylori) is a helically-shaped bacterium that is usually found in the stomach. It burrows through the gastric mucous lining to establish an infection in the stomach's epithelial cells (see photo). Approximately 90% of the people infected with H. pylori will never experience symptoms. Others may develop peptic ulcers and show symptoms of chronic gastritis. The method of motility of H. pylori is a prokaryotic flagellum attached to the back of the bacterium that rigidly rotates like a propeller on a ship. The flagellum is composed of proteins and is approximately 40.0 nm in diameter and can reach rotation speeds as high as 1.50 × 103 rpm. If the speed of the bacterium is 10.0 um/s, how far has it moved in the time it takes the flagellum to rotate through an angular displacement of 5.00 × 107 rad?
A Hippogriff is a magical beast that had the front legs, wings, and head of a giant eagle and the body, hind legs and tail of a horse. It is very similar to another magical creature, the Griffin, with the horse rear replacing the lion rear. A slightly different breed of Hippogriffs, living in the Rathlin Island—the northernmost point in Northern Ireland, was known to have a growth rate of 0.2 individuals per individual—year. From an initial population of N0, it grew to 35 individuals after 5 years. After 17 more years, the total population of hippogriffs in Rathlin Island rose to 1588 individuals. Solve for the carrying capacity of Rathlin Island and the initial population of the said specie. Box the answers.
1) Suppose that the initial number of bacteria in a culture is 200, and that there are 700 bacteria present after 2 days. How long would it take for the number of bacteria to reach 4000? 2) A bowl of soup originally at 140 F is sitting in a 70 F room. After 10 minutes, the soup has cooled to 120 F. How long will it take for the soup to cool to 90 F?
(a) About how many microorganisms are found in the human intestinal tract? (A typical bacterial length scale is one micron = 106 m. Estimate the intestinal volume and assume bacteria occupy one hundredth of it.) (b) Discuss your answer to part (a). Are these bacteria beneficial, dangerous, or neutral? What functions could they serve?
If you are infusing a 1 L Iv bag of a normal saline at a rate of 100 ml per hour, how long will it take for the entire IV bag to infuse into the patient ?
John Snow, an English physician, has observed that disease is becoming more prevalent in a local neighborhood and he wants to know why. He collects information about the local people, including how many family members contracted the disease and where they live. John discovers that the disease is most common in homes located closest to the town’s water pump. John contrives an explanation: that the illness is waterborne and people are contracting the disease from water they retrieve from the town’s water pump. After petitioning the authorities, the handle at the pump is removed. John collects data about disease incidence and finds that occurrence of the disease is greatly reduced. John concludes that the water from the pump was causing the illness. What step(s) of the scientific method is/are missing from Data Table 1? Describe each and propose a way that they might be fulfilled in the scenario?
How many actin monomers within an actin filament would a myosin molecule need to ratchet in order to contract a cell by approximately 1 μm? How fast could a non-muscle cell make this contraction compared to a muscle cell if the relative rates of myosin walks on F-actin are 4.5 μm/sec and 0.04 μm/sec for myosin II and I respectively?
How many 6.60 × 10−6 m long red blood cells stack up to be the thickness of a single sheet of 1.0 × 10−4 m thick paper?
45. Insects do not have lungs as we do, nor do they breathe through their mouths. Instead, they have a system of tiny tubes, called tra- cheae, through which oxygen diffuses into their bodies. The tracheae begin at the surface of an insect's body and penetrate into the interior. Suppose that a trachea is 1.9 mm long with a cross-sectional area of 2.1 × 10-º m². The concentration of oxygen in the air outside the insect is 0.28 kg/m², and the diffusion constant is 1.1 × 10-5 m²/s. If the mass per second of oxygen diffusing through a trachea is 1.7 X 10-12 kg/s, find the oxygen concentra- tion at the interior end of the tube.
The hydrolysis of acetyl phosphate has AG = -42 kJ mol¹ under typical biological conditions (at pH = 7). If the phosphorylation of ethanoic acid were to be coupled to the hydrolysis of ATP, what is the minimum number of ATP molecules that would need to be involved in each phosphorylation event?
The human lungs have a volume of only about 4 L, yet an internal surface area of nearly 100 m2. Why is this important, and how is this possible?
Suppose you have a culture of bacteria, where the density of each bacterium is 2.0 g/cm³. a. If each bacterium is 5µm × 5µm × 20µm in size, find the number of bacteria if their total mass is 30 grams. Recall that 1µm = 10−6 meters. b. Suppose that you learn that the sizes of bacteria range from 4µm × 5µm × 15µmto5µm × 6µm × 25µm. What is the range of the possible number of bacteria making up the total mass of 30 grams?

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