But if nothing unexpected happens, there's a high probability that it's a kind of Gram-positive bacteria, like this... this and that."

Medical or university students who have studied biology should know.

Bacteria can be classified into Gram-positive and Gram-negative bacteria through Gram staining.

The former retains the blue-violet color of the initial crystal violet stain.

The latter loses the initial crystal violet color and adopts a complex red or saffron yellow color after staining.

The distinction between the two types of bacteria is also very evident:

Positive bacteria produce exotoxins, while negative bacteria produce endotoxins.

Therefore, Gram-positive bacteria generally cause suppurative lesions.

A typical case was the bacteremia Wang Yue had, as well as the inevitable sepsis in the normal course.

As for Gram-negative bacteria, although they can also cause bacteremia and septicemia, they generally occur in the abdomen, bile ducts, and urinary tract.

Of course.

Dyeing is only necessary to classify bacteria, and observing certain types of bacteria under a high-powered microscope is not difficult.

Afterward, Xu Yun pointed out several bacteria with distinct appearances, like staphylococcus and streptococcus, among others.

The shape is recognizable at a glance.

After all, although Old Su's drawings were done meticulously, hand-drawing inevitably struggles with fidelity.

Especially compared to later imaging techniques, Old Su's transferred images are indeed not very clear, so he could only prioritize introducing bacteria with distinct characteristics.

Speaking of which...

If there's an opportunity, they should develop pencils to advance sketch drawing.

After all, compared to traditional ink paintings, sketch drawing has much higher fidelity.

If the technique is exquisite, the picture quality might even be uncannily accurate.

"Staphylococcus..."

Wang Yue repeated the term, staring at the image on the drawing for a while.

As if trying to etch it into his mind.

Then turned his head.

He exchanged a glance with his brother.

Although they were merely military generals with limited horizons, unlike Old Su who was so understanding,

they couldn't evaluate the value of the microscope from a historical perspective either.

Yet as survivors of bacteremia and frontline leaders, they knew one thing clearly:

Excrement on the battlefield is almost an ultimate weapon that cannot be defended against.

In encounters, excrement was often applied to blades, guns, or arrows, proving more potent than many poisons.

Anyone hit by this would likely perish, and at best, recover only to become a cripple.

In siege defense, defenders would heat urine and feces in pots, combining them with rolling stones.

There are many heat-resistant bacteria in feces that can survive more than 30 seconds even under Baidu, and some would continue to survive as spores.

Thus, those affected would first suffer burns, then develop suppurative infections, with survival being a miracle for even one out of ten.

This fecal weapon also had a loud name:

Golden Juice.

Incidentally.

Golden Juice is also one of the unique weapons in the history of the Huaxia Civilization.

Over in Europe, they mostly used asphalt, aiming to burn the enemy through the conduction of heat via armor, without subsequent biological damage.

Overall.

If the Military Equipment Bureau could further explore the properties of Escherichia coli through the microscope, they might be able to produce more superior drugs!

After all, while allicin has an excellent effect, its preservation time is still too short.

It's fine for occasional emergencies but hard to popularize or use widely in emergencies.

If the court could develop more efficient drugs, it might even have significant or decision-making impacts on the western front's situation!

Then Xu Yun played the teacher again, briefly introducing some basic concepts to Old Su and others.

And like when making lenses earlier, he chose to feign ignorance on some concepts again.

Either the manuscript was lost, or even the Wind Spirit Moon Shadow sect didn't study it deeply.

As for deeper cellular internal observation...

He planned to tackle that in a few days.

First, because too much knowledge at once can't be digested, and excessive knowledge infusion might not be effective.

Secondly, internal cellular observation also requires some staining agents, which need time to prepare.

In later eras, acetic orcein or crystal violet was commonly used as staining agents, but actually, hematoxylin is also a good staining agent.

More crucially.

Hematoxylin doesn't require very advanced equipment to prepare; finding materials is enough.

Its precursor, called haematoxylin, is extracted from the trunk of the logwood tree.

Once oxidized, haematoxylin becomes hematoxylin and can be used as a dye.

Regions in cells rich in DNA and RNA can be stained blue with hematoxylin, making observation and interpretation much easier.

On another note.

After dismounting from the microscope,

Xiaoli stealthily pulled Xu Yun to the side, saying mysteriously:

"Wang Lin, may I ask you something?"

Xu Yun blinked:

"What is it?"

Xiaoli glanced around and asked:

"Let me ask you, how much silver did this microscope cost in total?"

"How much silver?"

Upon hearing Xiaoli's words, Xu Yun was taken aback.

Why was Little Doudou asking about silver out of nowhere?

Although puzzled, he rubbed his head and answered truthfully:

"For materials, about a hundred guan might do. If you skip the silver plating, it might be less than a hundred?

But if you factor in labor costs, it's hard to say; hiring Master Qi probably wasn't cheap."

Actually, from an objective perspective.

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