#clonal

[whats-in-a-sentence]

One set of superficial initials gives rise to a clonally distinct epidermal layer, termed L1, while more internal sets of of initials give rise to the subepidermal L2 later and a centrally positioned L3 layer (see Figures 17.25B and 17.26).

"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.

[victusinveritas]

[otaku553]

[balkanradfem]

i have seen old tjikko - a clonal tree that's the most recent of several genetically identical trees that have been growing in the same spot for nearly 10 000 years. it likely sprouted for the first time very shortly after the ice receded from that part of sweden.

unh I love her

[sitting-on-me-bum]

Worker ants tend to pupae and small larvae in a colony of clonal raider ants, Ooceraea biroi.

PHOTOGRAPH BY DANIEL KRONAUER

[crosswordgf]

❣️❣️❣️❣️

[leam1983]

I'm guessing this is what it feels like to be one of the handful of sentient creatures Ents tolerate around Fangorn. You're just some dude living your life in accordance to Tolkien's weird lifespan estimates for Men, and the thing that gives you a placid nod is practically as old as Arda itself.

[whats-in-a-sentence]

These cells grow relatively normally but can be easily recognized by their increased nuclear volume and cell size (Figure 17.26).

"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.

[badolmen]

bwa

[raskies456]

So researchers recently found out that one of the secrets of Roman concrete that makes it so incredibly durable is the presence of lime clasts, which are little chunks of lime (a family of Calcium Oxide/Hydroxide minerals). People used to dismiss the clasts as a defect, since lime is pretty fragile and reacts with water.

However, that turned out to be the point. When looking at the lime clasts’ microscopic features, they realized that the clasts would have to have formed under high heat, and were specifically made out of quicklime (CaO) which is more reactive. The heat allowed the quicklime clasts to take on specific properties, including being extremely brittle, and this seemed to be purposeful.

But why would they want extra brittle and reactive lime clasts in the concrete? It turns out the clasts are what give Roman concrete the ability to self repair, sealing up minor cracks when they form. When the concrete cracks, it will crack through the lime clasts, because the lime is far more brittle than the rest of the concrete. Then, when water flows into the cracks, it starts to dissolve the lime before eventually crystalizing as calcium carbonate inside the cracks. This seals the cracks automatically!

If you want to know more, this is a good article on the research and how they tested and figured this out!

i dont care about the movies. or the shows. i dont see or look at tem. Can we talk about something else like the trees or concrete mixing methods

[lupinus-bicolor]

Shout-out to my brother for getting the coolest fucking pictures of my garden ever. wtf

[agroemdia]

Produtores e empresas paraenses conhecem o Cupuaçu 5.0

Kit clonal, com as novas cultivares de cupuaçuzeiro desenvolvidas pela Embrapa, apresenta alta produtividade e sanidade, com boa resistência à vassoura-de-bruxa

Foto: Ronaldo Rosa/Embrapa/Divulgação Um dia de campo na cidade de Tomé-Açu, no nordeste paraense, apresentou a produtores, técnicos, gestores públicos, empresas privadas e instituições de ensino e pesquisa, o kit clonal Cupuaçu 5.0, com as novas cultivares de cupuaçuzeiro desenvolvidas pela Embrapa, para alta produtividade e sanidade, com boa resistência à vassoura-de-bruxa. No ano em que a…

[considered-the-tetrapod]

These fuckers! I'm pretty sure that's a pyrosome, and if so they're tubular (literally) colonies of hundreds to thousands of little guys that are able to jet siphon their way around. Some species can be 20m long and are bioluminescent! Nature is wild

Can we like. Talk about this.

[jessdrawz]

"Great Basin Bristlecone pines are remarkable for being the oldest non-clonal species on the planet. This strange tree, shaped by the wind, snow, and rain has survived over thousands of years, overseeing the rise and fall of great empires, growing through ice-ages and catastrophic volcanic eruptions. But their ability to survive these harsh environments and adverse growing conditions is exactly their secret to great longevity." - Nat'l Park Service (nps.gov)

[oaresearchpaper]

Rapid In Vitro Clonal Propagation of Hybrid Muskmelon (Cucumis melo L.) from Seedling Explants

Abstract

An investigation was undertaken to develop a reliable strategy for large scale multiplication of a hybrid cultivar of muskmelon through in vitro clonal propagation. Best in vitro seed germination was observed in MS medium containing 0.5 mg/l GA3. Two explants excised from axenic seedlings were tested for shoot proliferation and leaf node showed better shoot proliferation than shoot tip explants. Maximum shoots (8.22±0.23) per culture were produced from leaf node explants cultured on MS medium augmented with 1.0 mg/l BA. Rooting was found best on 0.1 mg/l NAA containing medium. Rooted plantlets were acclimatized gradually and transferred to the field condition and finally, 82 % plantlets were survived well.

Introduction

Muskmelon (Cucumis melo L. cv. reticulata) is a popular fruit plant belonging to the family of Cucurbitaceae. It is native to Persia (Iran), Armenia, and adjacent areas on the west and the east and now widely grown in the tropics, subtropics and the temperate regions of the world (Keng and Hoong, 2005). Due to having high fruit value, muskmelon has recently been introduced in Bangladesh (http://www.sdnbd.org/tomato_harvest.htm). This is an annual plant and each plant can produce an average of 5-7 fruits. The fruits being rich in vitamin B, vitamin C, calcium and β-carotene have both edible and medicinal uses also. Traditionally this plant is cultivated by seeds and the commercial growers face several problems such as high market value (150 BDT/seed) of hybrid seeds, low seed germination rate and disease susceptibility.

In this context, in vitro clonal propagation of hybrid plantlets could be an alternative approach for large scale cultivation of muskmelon. Keng and Hoong, (2005) used field grown nodal explants for in vitro propagation of muskmelon while Tarsem et al., (2005) used in vitro derived plantlets for micropropagation of muskmelon mainly with a view to maintain a male sterile line. But the abovementioned reports are not supported enough for large scale clonal propagation of muskmelon as these do not have a clear concept. Moreover, in Bangladesh no report has been made yet on in vitro clonal propagation of this fruit plant. The present study, therefore, describes the first report on rapid multiplication of homogenous plantlets of a hybrid cultivar of muskmelon via in vitro raised seedling explants.

Source : Rapid in vitro clonal propagation of a hybrid muskmelon (Cucumis melo L.) cultivar from seedling explants