Seminar of the Institute of Physics - Dr. Antonio Šiber: Mechanics of pollen drying and swelling

95 views

INSTITUTzaFIZIKU

Published on Dec 12, 2023
About :

Mechanics of pollen desiccation and swelling The response of pollen grains to changes in environmental humidity is determined by their structure, which is characterized by soft areas (apertures) in an otherwise rigid shell. Changes in humidity can lead to desiccation of the grain and its wrapping or collapse, but also to excessive swelling and even cracking. An elastic grain model has been formulated and used to investigate the mechanics of wrapping and swelling of pollen grains and the role that apertures play in this process. Depending on the design of the apertures, desiccation can lead to their regular closure and cessation of further moisture loss, which preserves the fertilization potential of the pollen grain. However, for this process to truly wrap the grain regularly, it is necessary that the elasticity and geometry of the grain meet certain conditions. Therefore, the evolutionary trajectory of plant species is also determined by the mechanical constraints that pollen must meet. On the other hand, the inflow of water into the grain leads to its swelling and possible cracking, and the process also depends on the properties of the pollen apertures. Since apertures also characterize allergenic pollen carried by the wind, the cracking of such pollen is also important in the context of human health.

  • vidoe Comments
Trend Videos
1:00
Sensational! Mainz beat Bayern! 1. FSV Mainz 05 - FC Bayern Munich 2-1 Highlights Bundesliga
Bundesliga
636,741 views   1 day ago
17:53
Don't fry anchovies too hard✔️ This method is the best side dish that never leaves any residue.
엄마의손맛
216,995 views   3 days ago
3:34
This is how to eat winter cabbage and apples🥬I've been eating it every day instead of breakfast these days, and my belly fat has gone down (ft. cabbage and apple salad, homemade tofu mayonnaise)
쿠킹 프린세스 cooking
283,062 views   2 days ago
23:44
Did you really cut off the internet? ⭐Jorim Ping Choi Kang-rok⭐, who disappeared after the end of <Black and White Chef> and then appeared again Please Take Care of My Refrigerator since 2014 Broadcast on JTBC 241215
JTBC Voyage
832,771 views   21 hours ago
28:42
“Do you remember what my brother said when he came back from the US?” The legacy that Yoon Seok-min left for the Kia Tigers Cyber ​​Yoon Seok-min Ep. Yang Hyeon-jong-2
사이버 윤석민
312,528 views   3 days ago
12:20
Fashion that is too good to buy now 📉 Fashion items that are still trendy and therefore more difficult to buy
옆집언니 최실장 stylist unnie
195,073 views   1 day ago
1:00
Sensational! Mainz beat Bayern! 1. FSV Mainz 05 - FC Bayern Munich 2-1 Highlights Bundesliga
Bundesliga
636,741 views   1 day ago
15:17
The 5 most satisfying purchases in 24 years, selected after spending 190 million won (daily necessities) l Made in Korea
귀곰
627,879 views   3 days ago
23:44
Did you really cut off the internet? ⭐Jorim Ping Choi Kang-rok⭐, who disappeared after the end of <Black and White Chef> and then appeared again Please Take Care of My Refrigerator since 2014 Broadcast on JTBC 241215
JTBC Voyage
832,771 views   21 hours ago
17:53
Don't fry anchovies too hard✔️ This method is the best side dish that never leaves any residue.
엄마의손맛
216,995 views   3 days ago
26:31
[ENG] A hearty bowl of soup🔥 Pouring out the national prestige of idols🇰🇷 Felix & Changbin EP.9
공파새
277,581 views   3 days ago
36:18
4 Views Part 1 2024 World Championship Documentary
LCK
343,700 views   2 days ago
1:43:48
The Joys and Sorrows of Four Brothers Swirling in the Sapa Fog Punghyanggo EP.3 Sapa, Vietnam #Yoo Jae-seok #Hwang Jung-min #Ji Seok-jin #Yang Se-chan
뜬뜬 DdeunDdeun
3,078,849 views   1 day ago
24:08
How to make it look 10 pyeong wider just by changing the furniture arrangement! It changes like this?!?!😲
아옳이
321,914 views   3 days ago
7:20
bad seoul guys
너덜트
1,653,235 views   11 days ago
12:20
Fashion that is too good to buy now 📉 Fashion items that are still trendy and therefore more difficult to buy
옆집언니 최실장 stylist unnie
195,073 views   1 day ago
2:31
Lee Myung-hwa (이명화) - Real Deal Show! MusicCore MBC241215 Broadcast
MBCkpop
305,356 views   1 day ago
34:24
“Hyung! This time, I think it’ll really work out” Opening D-15, urgent gathering of smart brothers for the success of the cafe🚨 (feat. Calm Man, Joo Woo Jae) [Matpia and Popup Cafe] EP.02 #Popup Cafe
the BOB studio | 더 밥 스튜디오
871,953 views   4 days ago
12:32
The reaction of Vietnamese employees who got to eat a lot of oysters in Korea that were too expensive to even see
코이티비 KOITV
333,444 views   1 day ago
15:17
The 5 most satisfying purchases in 24 years, selected after spending 190 million won (daily necessities) l Made in Korea
귀곰
627,879 views   3 days ago
8:43
There's someone hiding in my house...?
배말랭
366,906 views   5 days ago
57:44
Chicken Skewers VS Hotdogs in 24 Hours!! How Many Can You Eat at Once to Get Full?! (Skewer Warning)
파뿌리
817,103 views   8 days ago
4:58
Please put your fingerprint on the machine in front.
킥서비스
741,736 views   5 days ago
3:34
This is how to eat winter cabbage and apples🥬I've been eating it every day instead of breakfast these days, and my belly fat has gone down (ft. cabbage and apple salad, homemade tofu mayonnaise)
쿠킹 프린세스 cooking
283,062 views   2 days ago
27:57
A game of rock-paper-scissors where you bet your life on one game!! The loser gets to go to LA and buy LA ribs ㅋㅋㅋ
보물섬
1,217,957 views   9 days ago
32:23
SUB) One bite Hyeyoung 😋 Episode 4 + Mukbang VLOG) Cream rice cake for spring, the best combination ever❤️Chocolate shell yogurt honey rice cake, sesame oil + seaweed, honeycomb honey + cracker, strawberry chocolate chokku rice cake, self-yo-ah-jeong, butter yakgwa, year-end gift event👏🏻 MUKBANG
여수언니 정혜영 [Yeosu Unnie]
226,513 views   7 days ago
57:44
Chicken Skewers VS Hotdogs in 24 Hours!! How Many Can You Eat at Once to Get Full?! (Skewer Warning)
파뿌리
817,103 views   8 days ago
12:15
Hong Jin-kyung's eyes are tightly shut, the worst drug street in America (Shocking, Interview with an Addict)
공부왕찐천재 홍진경
1,599,169 views   4 days ago
24:33
The story of a Japanese female friend who eventually quit her job and came to Korea
여행가 제이 [Jay world traveler]
551,702 views   8 days ago
24:08
How to make it look 10 pyeong wider just by changing the furniture arrangement! It changes like this?!?!😲
아옳이
321,914 views   3 days ago
26:23
“I have to help Seokmin hyung~” Ryu Hyun-jin, Yoon Seok-min, and Kim Kwang-hyun play like this when they meet Cyber ​​Yoon Seok-min Ep. Ryu Hyun-jin + Kim Kwang-hyun-1 (There’s an event~★)
사이버 윤석민
819,053 views   4 days ago
10:25
3 hours before returning from vacation
숏박스
4,126,033 views   10 days ago
Google AdSense
336 x 280
Up Next
50:18
New York: Between Icons and New Scenes I SLICE VOYAGE COMPLETE DOC
SLICE Voyage
64,580 views
1 year ago
22:54
NEW YORK travel guide, what to see, what to do? 🎇
Cindy GO Travels
48,159 views
2 years ago
27:57
REVIEW AFTER SPENDING 1 MONTH IN HANOI! (budget and good addresses)
LODISEY
2,207 views
9 days ago
1:00:13
The French in New York
Documentaire Société
195,890 views
1 year ago
34:27
Our Unfiltered World Tour 🎥 409 Days 🌏
Bara autour du monde
760 views
3 weeks ago
21:15
OUR GUIDE TO VISITING KUALA LUMPUR IN 3 DAYS (Prices and Advice...)
LODISEY
6,740 views
3 months ago
1:30:56
Weekend in New York - Beautiful Escapes
Echappées belles
198,442 views
3 months ago
28:09
🗽10 days in new york/vlog 🏙 : best food tips, where to go, what to do! PART 1
Margavalux FR
15,681 views
1 year ago
39:13
22 days on a ROAD TRIP: I NEVER thought I would prepare for such a journey in CALIFORNIA
PREPARER SON VOYAGE avec STEPHANE
50,678 views
1 year ago
57:43
New York Station: A City Within a City Report BSF
ICON TV - Docs
20,093 views
1 month ago
11:50
#23 VISIT LIMA IN PERU IN 3 DAYS [TRAVEL VLOG]
LODISEY
17,633 views
2 years ago
22:30
WE LEAVE BALI FOR A ROADTRIP TO LOMBOK: TETEBATU & EASTERN GILI [VLOG - EP 1]
LODISEY
1,985 views
2 months ago
36:33
NEW YORK in 2024: TOP 10 and complete guide to the must-do activities
Alexandre Boero
24,578 views
1 year ago
31:26
Honeymoon - Step #1: NEW YORK 🇺🇸! (SPECIAL EDITION)
Sabrina Zazaï-Özil #SZO31
1,381 views
1 month ago
23:38
These French people who live like in Gossip Girl in New York
AILLEURS ▸ reportages voyages
258,019 views
11 months ago
49:58
My Lord, increase my knowledge with Dr. Hossam Mowafy Full episode 12-13-2024
Sada Elbalad - صدى البلد
1,813 views
2 days ago
43:43
Bab Al-Khalq Dr. Hossam Mowafy’s segment reveals what anemia is, what its causes are, and how to get rid of it
Al Nahar TV
126,904 views
3 years ago
46:20
My Lord, increase my knowledge with Dr. Hossam Mowafy Full episode 10-20-2023
Sada Elbalad - صدى البلد
16,055 views
1 year ago
1:20:33
Medicine and modern diseases with Dr. Hossam Mowafy in Makhyal With Abdullah Al Bandar
مخيال
533,480 views
8 months ago
49:41
My Lord, increase my knowledge with Dr. Hossam Mowafy Full episode 12-6-2024
Sada Elbalad - صدى البلد
4,413 views
9 days ago
56:58
Bab Al-Khalq Special episode with Dr. Hossam Mowafy and treatment of the most common diseases - Full episode November 21, 2020
Al Nahar TV
144,580 views
4 years ago
50:32
My Lord, increase my knowledge Full episode 12-1-2024
Sada Elbalad - صدى البلد
13,414 views
11 months ago
2:36:59
When will we celebrate your birthday? - Dr. Ahmed Amara
DrAhmedEmara
48,927 views
5 days ago
48:23
My Lord, increase my knowledge with Dr. Hossam Mowafy Full episode 7-21-2023
Sada Elbalad - صدى البلد
12,057 views
1 year ago
15:48
Gogol: Biography Secrets They Don't Teach You About in School
Загадки истории
282,935 views
1 day ago
48:07
My Lord, increase my knowledge with Dr. Hossam Mowafy - June 2, 2023 - Full episode
Sada Elbalad - صدى البلد
17,187 views
1 year ago
19:37
Walking / Is it really a sport or a waste of time / Information that will change your health forever
فِكر تاني
625,328 views
1 month ago
48:10
Bab Al-Khalq - Saturday, May 13, 2023 - Dr. Hossam Mowafy reveals a surprise about the benefits of cortisone and the risks of using it
Al Nahar TV
18,556 views
1 year ago
1:44:12
What Don't We Know About Prisons? Their Story Podcast 039 Dr. Ayman Al-Atoum
Sayer Alotaibi
20,841 views
1 day ago
53:59
Crypto Queen: The World's Most Wanted Fraudster BBC Documentary
BBC News - Русская служба
369,871 views
2 days ago
2:13:20
How do we understand life around us? With Dr. Abdul Karim Bakkar
تنوين بودكاست | Tanween Podcasts
119,141 views
6 months ago
49:07
Be gentle with the hearts, O Al-Minshawi, be gentle.. A miraculous recitation that awakens the soul and shakes the limbs by Sheikh Al-Minshawi High quality ᴴᴰ
الشيخ محمد صديق المنشاوي
5,949,441 views
Streamed 1 year ago
19:42
Dr. Hossam Mowafy will teach you how to protect yourself from diabetes, especially if there is a history of the disease in your family.
Al Nahar TV
462,301 views
2 years ago
47:29
My Lord, increase my knowledge with Dr. Hossam Mowafy Full episode 2-2-2024
Sada Elbalad - صدى البلد
18,567 views
10 months ago
2:06:27
Dr. Ahmed Haroun: Understanding the Self - The Secret (1) of Happiness and Success Full Episode
د. أحمد هارون - Dr. Ahmed Haroun
271,606 views
8 years ago
Google AdSense
336 x 280

fetery.com. Copyright 2024